JP6557600B2 - Power supply apparatus, control method thereof, and control program - Google Patents

Description

The present invention relates to, for example, a power supply apparatus fed from two systems such as a gas engine generator and a system power supply, and a control technique thereof.

  A gas engine generator includes a battery that supplies power when the engine is started. A system power supply such as a commercial AC power supply or a generator output is used for charging the battery.

With regard to charging of such a battery, a power supply device that charges a battery using a system power supply and a generator is known (for example, Patent Document 1). In this power supply device, a relay contact is provided to switch between two power sources. When the generator is in operation, the relay contact is closed to supply power from the engine generator to the battery, and when the generator is stopped, the relay contact is opened. Power is supplied to the battery from the grid power supply.

JP-A-2-23039

  In a charging system that charges the battery using only the system power supply, if the power failure time of the system power supply becomes longer, the battery is consumed during the operation of the generator, so the operation time of the generator depends on the battery capacity. It is not possible to operate the generator.

  In a charging system that charges a battery using only the generator output, if the generator stop time is long, the battery may be consumed due to spontaneous discharge, and the generator may not be started.

  On the other hand, in the hybrid charging system that can charge the battery with both the system power supply and the generator output, the battery consumption can be suppressed by charging with the generator output during the operation of the generator. Driving is possible. Even when the generator is stopped for a long time, the battery can be charged by the system power supply to compensate for the spontaneous discharge of the battery, and the battery can be maintained in a fully charged state.

  By the way, in such a hybrid charging system capable of charging from two systems, it is necessary to switch between two systems. For example, when the system is normal, when the engine start mode transitions to the power generation mode, when the power generation mode transitions to the standby mode, when a power failure occurs during the start mode, when the system power fails, when the power generation mode transitions to the standby mode, In some cases, the power supply is switched when the system is restored.

  For such power supply switching, a relay is used, and a power supply circuit that obtains charging power from a system power supply or a generator output is provided. The power supply circuit includes a plurality of capacitors that are charged when power is supplied to the system power supply or the generator output. In power supply switching, when a capacitor suddenly shifts from a discharged state (non-charged state or low-charged state) to a charged state, a potential difference occurs between the terminals of the capacitor and an excessive inrush current associated with charging flows. Even in power supply switching, inrush current does not flow when the power supply state changes to the non-power supply state, and the capacitor is discharged, and the capacitor discharge current does not become a problem.

  When an inrush current occurs, a relay contact that is in a closed state has a problem that discharge occurs between the contacts, an excessive inrush current reaches several tens of amperes, and the contact electrode is welded.

  In order to avoid such contact welding, when a relay with a large switching capacity is used, there is a problem that the relay becomes large and hinders cost reduction.

Therefore, in view of the above problems, the present invention is to suppress an inrush current at the time of power supply switching, prevent an increase in the size of a relay, and reduce equipment costs.

In order to achieve the above object, according to one aspect of the power supply apparatus of the present invention, a generator that generates electric power by receiving a driving force of an engine, a battery that supplies electric power to at least the engine, and a first power supplied to the battery. a first power supply circuit that outputs a first power, a second power supply unit for Ru and a power supply circuit for outputting a second power fed to the engine, connecting or the between the power supply unit and the system power supply A first switching means for switching to one of a connection between a power supply unit and the generator; a connection between the battery and the first power supply circuit; or a connection between the battery and the second power supply circuit. a second switching means for switching, and a said switching control unit controls the first switching means and said second switching means, said switching control unit, the normal of the system power supply, the first switching Means Parts and the connection between the system power supply, said by the second switching means and connected between said battery and said second power supply circuit, said was started the engine by feeding from the said system power supply battery thereby starting the generator, maintains a power supply to the power supply unit in the system power supply to the power output of the previous Symbol generator shifts to a stable state, when the transition to the stable state, the first switching means When switching the connection between the power supply unit and the generator to switch the power supply to the power supply unit from the system power supply to the generator and terminating the power generation of the generator, before the power generation voltage of the generator decreases by switching the first switching means for connection with the system power supply and the power supply unit switches the power supply to the power supply unit to the power grid from the generator, or power failure of the system power source, the power failure The detection point, by switching the second switching means to connect said second power source circuit and the battery, to start power generation of the generator by activating the engine by the power supply from the battery, the first by switching the first switching means to power from the generator, Jer switch the power supply to the power supply unit to the generator from the system power supply Bayoi.

  In the above power supply apparatus, the power supply unit may include a storage element through which a charging current flows when receiving the output of the system power supply or the generator on at least one or both of the input side and the output side.

In order to achieve the above object, according to one aspect of a method for controlling a power supply apparatus of the present invention, a method for controlling a power supply apparatus including a generator that is fed from a system power supply and generates power by receiving the driving force of an engine, Supplying at least electric power from the battery to the engine; first electric power supplied from the first power supply circuit of the power supply unit to the battery; or supplying power to the engine from the second power supply circuit of the power supply unit A step of outputting either one or both of the second power, and when the system power supply is normal, the first switching to either the connection between the power supply unit and the system power supply or the connection between the power supply unit and the generator The switching means is connected to the power supply unit and the system power supply, and switched to either the connection between the battery and the first power supply circuit or the connection between the battery and the second power supply circuit. Obtaining by the second switching means and connected between the said battery second power supply circuit to start the generator activates the engine by the power supply from the said system power supply battery, the generator The power supply to the power supply unit is maintained by the system power supply until the power generation output of the machine shifts to a stable state, and the first switching means is connected between the power supply unit and the system power supply when the system power supply is shifted to the stable state. When the power supply unit is switched to the connection between the power supply unit and the power supply to the power supply unit is switched from the system power supply to the generator, and the power generation of the generator is terminated, the power generation voltage of the generator decreases. before, by switching the first switching means from the connection between the generator and the power supply unit in connection with the system power supply and the power supply unit, the power supply to the power supply unit to the power grid from the generator Toggles, or, during a power failure of the system power source, the detection time of該停conductive, switches the second switching means to connect said second power source circuit and the battery, the engine by the power supply from the battery The power generation of the generator is started and the first switching means is switched from the connection between the power supply unit and the system power supply to the connection between the power supply unit and the generator to supply power to the power supply unit. Any step or two or more steps selected from these steps may be included in which the system power source is switched to the generator.

In order to achieve the above object, according to one aspect of a control program for a power supply device of the present invention, the program is executed on a computer mounted on a power supply device including a generator that is powered by a system power supply and generates power by receiving driving force of an engine. A control program for supplying power to at least the engine from a battery, a first power supplied to the battery by a first power supply circuit of a power supply unit , or a second power supply circuit of the power supply unit A function of outputting one or both of the second electric power fed from the engine to the engine, and a connection between the power supply unit and the system power supply or a connection between the power supply unit and the generator when the system power supply is normal The first switching means for switching to any one of the above is connected to the power supply unit and the system power supply, and the battery is connected to the first power supply circuit or before By connecting the battery and the second power supply circuit as a second switching means for switching to any one of the connection between the battery and the second power supply circuit, the power supply from the system power supply and the battery supplies the power. When the engine is started and the generator is started , the power supply to the power supply unit is maintained by the system power supply until the power generation output of the generator shifts to a stable state . 1 is switched from the connection between the power supply unit and the system power supply to the connection between the power supply unit and the generator, and the power supply to the power supply unit is switched from the system power supply to the generator. when to terminate, before the generated voltage of the generator is lowered, by switching the first switching means from the connection between the generator and the power supply unit in connection with the system power supply and the power supply unit, Switching power supply to the electric supply unit from the generator to the system power source, or, during a power failure of the system power source, the detection time of該停conductive, connection between said second switching means and the battery the second power supply circuit And the power is supplied from the battery to start the engine to start power generation of the generator, and the first switching means is connected to the power supply unit and the system power supply to connect the power supply unit and the generator. It is sufficient to provide any one function or two or more functions selected from these functions for switching the connection to the power source and switching the power supply to the power generator from the system power supply.

  According to the present invention, the following effects can be obtained.

  (1) Inrush current due to power supply switching can be avoided.

  (2) By using a relay setting with a small current capacity for the switching means, problems such as welding can be avoided.

(3) The manufacturing cost and maintenance cost of the power supply can be reduced.

It is a figure which shows an example of the power supply device and power supply part which concern on the 1st Embodiment of this invention. It is a flowchart which shows the procedure of electric power feeding switching. It is a figure which shows an example of the power supply device which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of a power supply part. It is a figure for demonstrating the standby mode and starting mode of a power supply device. It is a figure for demonstrating the power generation mode of a power supply device, and the charge mode by a system power supply. It is a figure for demonstrating the standby mode and electric power generation mode of a power supply device. It is a flowchart which shows the process sequence of power supply control. It is a figure which shows the power supply device which concerns on one Example of this invention. It is a figure which shows an example of the electric system of a power supply device. It is a figure which shows the electric power feeding switching system of load. It is a figure which shows an example of a control part. It is a figure which shows operation mode transition and connection switching. It is a flowchart which shows the process sequence of starting control. It is a flowchart which shows the process sequence of a power failure check of a system power supply. It is a flowchart which shows the process sequence of the electric power generation stop of a generator. It is a figure for demonstrating the 1st standby mode at the time of the system power supply normal. It is a figure for demonstrating the 1st start mode at the time of normal of a system power supply. It is a figure for demonstrating operation | movement of the electric power generation mode at the time of normal of a system power supply. It is a figure for demonstrating the system charge mode at the time of normal of a system power supply. It is a figure for demonstrating the 2nd standby mode at the time of the power failure of a system power supply. It is a figure for demonstrating the 2nd starting mode at the time of a power failure of a system power supply. It is a figure for demonstrating the power generation mode at the time of a power failure of a system power supply. It is a figure for demonstrating the emergency stop mode at the time of system power supply normal. It is a figure for demonstrating a power saving mode.

[First Embodiment]

  FIG. 1A shows a power supply device according to the first embodiment. The configuration according to FIG. 1A is an example of the power supply device of the present invention, and is not limited to the configuration according to the present invention.

  A system power source 4 is connected to the power source device 2 as a first power source, and a generator 6 is provided as a second power source used when the system power source 4 is out of power or normal. The system power supply 4 is, for example, a single-phase three-wire commercial AC power supply with a rated voltage of 100 [V] or 200 [V], and the generator 6 generates a similar AC output. The generator 6 is, for example, an engine generator, and the engine generator is provided with an engine 8 as a drive source.

  A load 10 is connected to the system power supply 4 and the generator 6. This load 10 is a so-called user load, and mainly includes a load 10-1 that supplies power when the system power supply 4 is normal, and a load 10-2 that supplies power mainly when the system power supply 4 fails. The load 10-2 may be an indispensable load at the time of a power failure of the system power supply 4 such as an emergency light.

  The power supply device 2 includes a battery 12 as a third power supply, a power supply unit 14 as a fourth power supply, and a switching means 16. The battery 12 supplies power to at least the engine 8 as an emergency power supply when the system power supply 4 is interrupted. The driving force of the engine 8 is applied to the generator 6 to generate power. The battery 12 may be a chargeable / dischargeable battery that supplies startup power to the engine 8. The power supply unit 14 receives the output of the system power supply 4 or the generator 6 and outputs first and second electric power.

The switching unit 16 switches the power supply to the power supply unit 14 according to the situation, the power generation output of the system power supply 4 or the generator 6. This power supply switching includes one or more of the following switching patterns P1, P2, and P3.
P1: When the generator 6 is started when the system power supply is normal, power supply to the power supply unit 14 is maintained by the system power supply 4 until the power generation output of the generator 6 transitions to a stable state. The power supply to the power supply unit 14 is switched from the system power supply 4 to the generator 6.
P2: When the power supply of the generator 6 is terminated when the system power supply 4 is normal, the power supply to the power supply unit 14 is switched from the generator 6 to the system power supply 4 before the power generation voltage of the generator 6 decreases.
P3: When the power supply of the system power supply 4 is interrupted, the power supply to the power supply unit 14 is switched from the system power supply 4 to the generator 6 when the power failure is detected.

  The switching means 16 is provided with a first switch 16-1, which is a relay contact, for example, and is switched by the switching control unit 17. The switch 16-1 is switched to the system side contact a during standby, and is switched to the power generation side contact b during operation of the generator 6. When the system power supply 4 is normal, the power supply unit 14 is supplied with power from the system power supply 4. When the generator 6 is in operation, power is supplied from the generator 6.

  The switching control unit 17 is constituted by a computer, for example, and performs control such as switching of the switch 16-1 according to the state of the system. In order to detect a power failure of the system power supply 4, a power failure detection circuit may be provided to determine whether the system power supply 4 is normal or a power failure. The power supply unit 14 may be configured by a single power supply circuit to output the first and second powers, or may include two or more power supply circuits to output the first and second powers. .

  The engine 8 includes an engine operating unit 18-1 and an engine ASSY 18-2. The engine operating unit 18-1 rotates by burning the fuel gas and operates the generator 6. The engine ASSY 18-2 includes a drive circuit, sensors, and the like, and is assembled to the engine operating unit 18-1. The engine ASSY 18-2 includes a power supply unit 14 and a system / power generation / battery load unit 18-21 fed from the battery 12 and a battery load unit 18-22 fed from only the battery 12.

  The battery output side (first power side) of the power supply unit 14 is provided with a second switch 16-2. The switch 16-2 is closed when the battery 12 is charged. At this time, the battery 12 is charged by the output of the power supply unit 14.

  A backflow prevention means 20 is provided between the load output side (second power side) of the power supply unit 14 and the battery 12. The backflow prevention means 20 prevents backflow from the power supply unit 14 to the battery 12 when the switch 16-2 is opened and the second power is supplied from the power supply unit 14 to the engine ASSY 18-2 side. The backflow prevention means 20 may be any circuit or element that prevents backflow of current. For example, a diode that regulates the current direction in one direction may be used.

  FIG. 1B shows an example of a power supply circuit used for the power supply unit 14. The power supply circuit 140 transforms the power generation output of the system power supply 4 or the generator 6 to generate a predetermined DC output. In the first rectification unit 22, the output of the system power supply 4 or the generator 6 is rectified. The smoothing unit 24 includes a capacitor 28 as an example of a storage element, smoothes the output of the rectifying unit 22, and the output is applied to a DCDC converter (hereinafter referred to as “DC / DC”) 26.

  The DC / DC 26 converts the direct current input into alternating current and transforms it into direct current. That is, the switching unit 30 switches the input from the smoothing unit 24 and converts it into an alternating current. The transformer 32 transforms alternating current to a desired voltage. The second rectifier 34 rectifies the output of the transformer 32. The smoothing unit 36 includes a capacitor 38, which is an example of a storage element, and smoothes the output of the transformer 32, thereby generating a direct current output suitable for charging the battery 12 and driving the system / power generation / battery load unit 18-21. Generate.

  FIG. 2 shows an example of the procedure of power supply switching processing for the power supply unit 14. This procedure may be executed by a computer mounted on the switching control unit 17, but may be executed by a sequencer or the like.

  In this procedure, it is determined whether the system power supply 4 is normal (S101). If the system power supply 4 is normal (YES in S101), it is determined whether the generator 6 is started (S102).

  The power generation output of the generator 6 is monitored (S103), and it is determined whether the power generation output of the generator 6 has shifted to a stable state (S104). If the power generation output of the generator 6 has not shifted to the stable state (NO in S104), the power supply to the power supply unit 14 is maintained by the system power supply 4 (S105). If the power generation output of the generator 6 shifts to a stable state (YES in S104), the power supply to the power supply unit 14 is switched from the system power supply 4 to the power generation output of the generator 6 (S106). The power generation of the generator 6 is monitored (S107), and it is determined whether the power generation of the generator 6 is completed (S108).

  If the power generation of the generator 6 is completed (YES in S108), it is determined whether the power supply to the power supply unit 14 is switched from the generator 6 to the system power supply 4 (S109). If the power supply to the power supply unit 14 is switched from the generator 6 to the system power supply 4 (YES in S109), the power supply to the power supply unit 14 is supplied from the generator 6 to the system power supply 4 before the power generation voltage of the generator 6 decreases. Switch (S110).

  And if it is at the time of the power failure of a system power supply (NO of S101), the electric power feeding with respect to the power supply part 14 will be switched to the generator 6 from the system power supply 4 side at the time of detection of this power failure (S111).

  In this procedure, S101 to S107 are examples of the switching pattern P1, S108 to S110 are examples of the switching pattern P2, and S111 is an example of the switching pattern P3. In this procedure, any one of these switching patterns P1, P2, and P3 or a process including two or more may be used.

<Effect of the first embodiment>

  According to the first embodiment, the following effects can be obtained.

  (1) When power is supplied to the power supply unit 14 used for charging the battery 12, an inrush current due to a potential difference can be avoided between terminals of the capacitors 28 and 38 included in the power supply unit 14, and fusion between contacts due to a previous inrush current can be avoided. Can be avoided. As a result, a relay contact having a small current capacity can be used for the switch 16-1 of the switching means 16, and the cost of the switch 16-1 can be reduced.

  (2) The battery 12 provided in the event of a power failure of the system power supply 4 can be charged by the selective power supply from the system power supply 4 and the two-system power supply of the generator 6 to prepare for an emergency or the like. That is, inconvenience due to charging of only the system power supply 4 or charging of only the power generation output can be avoided, and the switching contacts such as the AC switching relay used for the switch 16-1 can be protected while ensuring the advantages of the two-system power supply. A high power supply device can be provided.

[Second Embodiment]

  FIG. 3 shows a power supply device according to the second embodiment. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The power supply unit 14 of this embodiment includes a first power supply circuit 14-1 and a second power supply circuit 14-2. Here, the first and second power supply circuits 14-1 and 12-2 are not limited to the power supply unit 14 including two power supply circuits, and may include three or more power supply circuits. The first power supply circuit 14-1 is a charging circuit that supplies charging power to the battery 12 as the first power described above. The power supply circuit 14-1 is supplied with power from the system power supply 4 when the system power supply 4 is normal, and supplied with power from the generator 6 during operation of the generator 6.

  The power supply circuit 14-2 is installed separately from the power supply circuit 14-1, and is supplied with power from the system power supply 4 when the system power supply 4 is normal, and supplied with power from the generator 6 when the generator 6 is in operation. The second power is a power supply circuit for a load that supplies power to the system / power generation / battery load unit 18-21 included in the engine ASSY 18-2. In this embodiment, the power supply unit 14 includes the first and second power supply circuits 14-1 and 12-2 to generate and take out two electric powers. The first and second powers may be extracted.

  The switch 16-1 is installed on the input side of the power supply circuits 14-1 and 12-2 as a first switching unit and is switched by the switching control unit 17. The switch 16-1 is switched to the system side contact a during standby, and is switched to the power generation side contact b during operation of the generator 6. Thereby, when the system power supply 4 is normal, the system power supply 4 is supplied to the power supply circuits 14-1 and 14-2, and is supplied from the generator 6 when the generator 6 is in operation.

In this embodiment, a switch 16-3 is provided as second switching means instead of the above-described switch 16-2 (FIG. 1). The switch 16-3 has two contacts, a power circuit 14-1 side contact c and a power circuit 14-2 side contact d, and is controlled by the switching control unit 17 in the same manner as the switch 16-1. When the battery 12 is charged by the power of the power supply circuit 14-1, the contact point is switched to the contact point c on the power supply circuit 14-1 side. In other cases, the contact point is switched to the contact point d on the power supply circuit 14-2 side.

  When the switch 16-3 is switched to the contact d side on the power circuit 14-2 side, the backflow prevention means 20 outputs power from the power circuit 14-2 to the battery 12 side with respect to power supply from the battery 12 to the engine ASSY 18-2. To prevent backflow.

  The switching control unit 17 is configured by a computer, for example, as in the first embodiment, and performs control such as switching of both the switches 16-1 and 16-3 according to the state of the system.

  FIG. 4 shows a configuration example of the switch 16-1 and the power supply circuits 14-1 and 14-2. The switch 16-1 includes two sets of switches 16-11 and 16-12, both of which include a system side contact a and a power generation side contact b. The switches 16-11 and 16-12 can be constituted by relays, and 160 is an operation coil for switching contacts.

  The power supply circuit 14-1 is similar to the power supply circuit 14 shown in FIG. 1B. The rectifier 22-1, the smoother 24-1, the DC / DC 26-1, the capacitor 28-1, the switching unit 30-1, the transformer Unit 32-1, rectification unit 34-1, smoothing unit 36-1, and capacitor 38-1, and receives the power generation output of system power supply 4 or generator 6 to generate predetermined DC power. Similarly to the power supply circuit 14 described above, the power supply circuit 14-2 includes a rectifying unit 22-2, a smoothing unit 24-2, a DC / DC 26-2, a capacitor 28-2, a switching unit 30-2, and a transforming unit 32-. 2, a rectifying unit 34-2, a smoothing unit 36-2, and a capacitor 38-2, and receives a power generation output of the system power supply 4 or the generator 6 to generate predetermined DC power.

  The operation of the power supply device 2 includes a standby mode, a start mode (FIG. 5), a power generation mode (A in FIG. 6), a charging mode by the system power supply 4 (B in FIG. 6), and a standby in the event of a power failure of the system power supply 4. Mode and start mode (A in FIG. 7) and power generation mode (B in FIG. 7) are included.

  (1) Normal operation of system power supply 4

When the system power supply 4 is normal, as shown in FIG. 5, the system power supply 4 is fed to the load 10-1, and the system power supply 4 is also fed to the power supply circuits 14-1 and 14-2. The power supply circuit 14-2 and the battery 12 are connected to the engine ASSY 18-2. However, since the output voltage of the power supply circuit 14-2 is higher than the output voltage of the battery 12 and no current flows from the battery 12, the battery 12 is consumed. Not.

  When the system power supply 4 is normal, when the engine operating unit 18-1 is started, as shown in FIG. 5, the switch 16-3 is switched to the contact d on the power circuit 14-2 side to stop the charging of the battery 12, Transition to the discharge state. Since the battery 12 and the power supply circuit 14-2 are connected to the engine ASSY 18-2, the engine operating unit 18-1 can be activated even when the system power supply 4 is normal.

  As shown in FIG. 6A, after the engine operating unit 18-1 is in a driving state and the generator 6 starts power generation, when the switch 16-1 is switched to the power generation side contact b, the power generation output is changed to the power circuit 14-. 1 and 14-2 are fed. Thereby, the output of the power supply circuits 14-1 and 14-2 is generated by the power generation output. The switch 16-3 is switched to the contact c on the power circuit 14-1 side. The battery 12 is charged by the charging power output from the power supply circuit 14-1.

  If a power generation output is obtained from the generator 6, this power generation output is fed to the load 10-2. Thereby, the load 10-2 can be driven. Further, as indicated by a broken line, the power generation output can be replaced with the system power supply 4 and supplied to the load 10-1.

  When the battery voltage drops when the system power supply 4 is normal, the switch 16-1 is switched to the system side contact a and the switch 16-3 is connected to the power supply circuit 14- even when the engine is stopped, as shown in FIG. 6B. It is switched to the 1 side contact c. The system power supply 4 is fed to the load 10-1, and the system power supply 4 is also fed to the power supply circuits 14-1 and 14-2. The battery 12 is charged by the charging power output from the power supply circuit 14-1.

  (2) System power supply 4 operation at power failure

  At the time of a power failure of the system power supply 4, as shown in FIG. 7A, the switch 16-1 is switched to the system side contact a, and the switch 16-3 is switched to the power circuit 14-2 side contact d. The output of the battery 12 is supplied to the engine ASSY 18-2 from the output side of the power supply circuit 14-2, and the engine operating unit 18-1 is activated by the engine ASSY 18-2. The power generation of the generator 6 is started by the activation of the engine operating unit 18-1.

  The power generation output is supplied to the load 10-2, but may be supplied to the load 10-1 in some cases.

  As shown in FIG. 7B, when the switch 16-1 is switched to the power generation side contact b, the power generation output is supplied to the power supply circuits 14-1 and 12-2. When the switch 16-3 is switched to the contact c, the battery 12 is charged by the charging power output from the power supply circuit 14-1.

  FIG. 8 shows an example of a processing procedure for power control of the power supply device 2. This processing procedure shows an example of a control method or control program for the power supply apparatus.

  This processing procedure is a procedure for starting the generator 6 when the system power supply 4 is normal. It is determined whether there is an instruction to start the generator 6 (S201). If there is an instruction to start the generator 6 (YES in S201), the switch 16-1 is switched to the power circuit 14-2 side contact d while the switch 16-1 is in the system side contact a state (S202).

  The engine operating unit 18-1 is activated, and the generator 6 starts power generation (S203). The engine ASSY 18-2 is always energized, and the engine 8 can be started by a predetermined procedure.

  The switch 16-1 is switched to the power generation side contact b (S204). The power generation output of the generator 6 is fed to the power supply circuits 14-1 and 12-2 (S205).

  During power generation by the generator 6, the switch control unit 17 switches the switch 16-3 to the contact c on the power circuit 14-1 side (S206), and the battery 12 is charged by the output of the power circuit 14-1 (S207).

  Also in this second embodiment, if the control operation of the processing procedure (FIG. 2) similar to that of the first embodiment described above is performed, the inrush current due to power supply switching is prevented from being generated. be able to.

<Effects of Second Embodiment>

  According to such a configuration, the following effects can be obtained.

  (1) With such a configuration, the same effects as those of the first embodiment can be obtained.

  (2) Separately from the first power supply circuit 14-1 that outputs charging power to the battery 12 by the output of the generator 6 or the power supply of the system power supply 4, for charging by the output of the generator 6 or the power supply of the system power supply 4 A second power supply circuit 14-2 for outputting load power other than power is provided. As a result, the battery 12 can be charged from either the system power supply 4 or the output of the generator 6, and the battery 12 can always be maintained in a charged state necessary for starting the generator 6. As a result, the diversity of the power supply device 2 can be increased.

  (3) When the system power supply 4 is normal, the engine operating unit 18-1 can be activated using the output of the battery 12 to cause the generator 6 to generate power.

In the above embodiment, the engine ASSY 18-2 is described as an example of the load of the battery 12, but a load other than the engine ASSY 18-2 such as a fuel electromagnetic valve supplied to the engine operating unit 18-1 may be included.

  FIG. 9 shows a power supply device according to one embodiment. 9, the same parts as those in FIG. 3 are denoted by the same reference numerals.

  The power supply device 2 includes a device casing 42. The device casing 42 includes a generator 6, an engine operating unit 18-1, an engine ASSY 18-2 (FIG. 10), a power generation control unit (GCU) 44, and the like. ing.

  The generator 6 is provided with an automatic voltage regulator (AVR) 46, and this AVR 46 adjusts the power generation output to a constant voltage.

  The engine 8 is a water-cooled engine, for example. The engine 8 includes a fuel supply unit 48, an intake unit 50, a mixer 52, an ignition unit 54, a starter 56, a coolant unit 58, and an exhaust unit 60. The fuel supply unit 48 includes a solenoid valve (MV) 62-1, a solenoid valve (SV) 62-2, and a gas regulator 64 that constitute a fuel solenoid valve 62 (FIG. 10), and the fuel gas G is supplied to the mixer 52 of the engine 8. Supply. The intake section 50 takes in air Ar from the wall surface of the apparatus housing 42 and supplies it to the mixer 52. The mixer 52 is driven by a mixer drive unit 66 to generate an air-fuel mixture from the fuel gas G and air Ar and supply the mixture to the engine operating unit 18-1. The ignition unit 54 includes a plurality of spark plugs 68-1, 68-2, 68-3, ignition coils 70-1, 70-2, 70-3, and an igniter 72, and performs an ignition operation. The starter 56 rotates using the battery 12 as a power source, and starts the engine operating unit 18-1. The coolant unit 58 includes a water pump 74, a radiator 76, and a radiator fan 78 to circulate cooling water, and cools the engine 8 with this cooling water. The exhaust unit 60 includes a muffler 80, and engine exhaust (EG) is performed from the muffler 80.

  The coolant temperature is detected by the temperature sensor 82-1, the rotational speed of the engine operating unit 18-1 is detected by the speed sensor 82-2, the cam position is detected by the cam position sensor 82-3, and the engine operating unit 18- The hydraulic switch 82-4 detects whether the oil pressure 1 is normal or abnormal.

  The engine ASSY 18-2 is a functional unit and its components used for starting the engine operating unit 18-1.

  The power generation output of the generator 6 is fed to the GCU 44 and the system power supply 4 is fed via the surge absorption circuit 84. The surge absorption circuit 84 absorbs a surge from the system power supply 4. The GCU 44 monitors whether the system power supply 4 is normal or a power failure, and performs power generation control of the generator 6. The GCU 44 is provided with an operation panel 45. The operation panel 45 displays information such as operation start, operation stop, and operation information.

  In this example, an automatic transfer switch (ATS) 86 is provided, and when the system power supply 4 is normal, the system power supply 4 is supplied to the load 10-1 via the ATS 86. During a power failure of the system power supply 4, the output of the generator 6 is supplied to the load 10-1 via the ATS 86, and at the same time, the output of the generator 6 is supplied to the load 10-2 via the electromagnetic contactor 88. In the GCU 44, when the system power supply 4 is normal, the generator 6 is operated to enable power generation.

  <Control system>

  FIG. 10 shows a control system of the power supply device 2. The GCU 44 includes a filter 90, a power failure detection circuit 92, a charging power supply circuit 94, a load power supply circuit 96, a first voltage measurement circuit 98-1, a second voltage measurement circuit 98-2, a current measurement circuit 100, a control unit 102, A control power supply circuit 104 and AC switching relays 106-11 and 106-12 are included.

  The filter 90 removes unnecessary frequency signals from the AC input from the system power supply 4. The power failure detection circuit 92 detects a power failure of the system power supply 4 and inputs a detection output indicating whether the system power supply 4 is normal or a power failure to the control unit 102.

  The charging power supply circuit 94 is an example of the first power supply circuit 14-1 of the power supply unit 14 described above, and is connected to the system power supply 4 and the generator 6 via the AC switching relays 106-11 and 106-12. Then, an output for charging the battery 12 is generated. This charging output is supplied to the positive electrode (+) side of the battery 12 through the charging relay 108 and the battery connection switch 110. The charging relay 108 is closed on the contact c side during charging, and is closed on the contact d side when the battery 12 is discharged. At this time, the output of the battery 12 is supplied to the engine ASSY 18-2 and the fuel solenoid valve 62 via the battery connection switch 110, the charging relay 108, and the diode 112. The diode 112 is an example of the backflow prevention means 20 described above. The battery connection switch 110 is always kept closed when the battery 12 is connected.

  The load power supply circuit 96 is an example of the first power supply circuit 14-2 described above, and is connected to the system power supply 4 and the generator 6 via the AC switching relays 106-11 and 106-12, and the engine ASSY18- 2 and the power supply output to the fuel solenoid valve 62 are generated. The output of the load power supply circuit 96 is supplied to the fuel solenoid valve 62 via the emergency stop switch 114-1, and also supplied to the engine ASSY 18-2 side via the emergency stop switch 114-2.

  The voltage measurement circuit 98-1 measures the generated voltage during power generation by the generator 6, and provides the measurement result to the control unit 102. The voltage measurement circuit 98-2 measures the output voltage of the battery 12 and provides the measurement result to the control unit 102.

  The current measurement circuit 100 receives the output of the current transformer CT installed in the R-phase and T-phase of the output of the generator 6, measures the current flowing through the loads 10-1 and 10-2, and displays the measurement result. Provided to the control unit 102.

  The control power supply circuit 104 generates a power supply output to the GCU 44 by power supply from the battery 12 or the load power supply circuit 96.

  The control unit 102 is configured by, for example, a computer and supplies power from the control power supply circuit 104, a power failure detection circuit 92, voltage measurement circuits 98-1 and 98-2, a current measurement circuit 100, an engine ASSY 18-2, and a temperature sensor 116 in the casing. The AC switching relays 106-11 and 86-12, the charging relay 108, the electromagnetic contactor control relay 118, and the like are controlled. The electromagnetic contactor control relay 118 controls opening and closing of the electromagnetic contactor 88 under the control of the control unit 102. The in-casing temperature sensor 116 detects the temperature in the casing of the power supply device 2 and provides it to the control unit 102.

  The engine ASSY 18-2 includes a hydraulic switch 82-4, a speed sensor 82-2, a temperature sensor 82-1, ignition coils 70-1, 70-2, 70-3, an igniter control unit 128, a starter 56, a needle motor 130, A throttle motor 132 and the like are included. The igniter control unit 128 supplies an operating current to the igniter 72 in accordance with the cam position detected by the cam position sensor 82-3.

  A battery 12 is connected to the starter 56 and the ignition coils 70-1, 70-2, and 70-3, and power is supplied from the battery 12 regardless of whether the system power supply 4 is normal or during a power failure. The speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the fuel electromagnetic valve 62 are supplied with power from the battery 12 or the load power supply circuit 96.

  FIG. 11 shows an example of a load power supply switching system. The ATS 86 is provided with changeover switches 86-1, 86-2, 86-3 for the U phase, N phase, and V phase, respectively. The system power source 4 is connected to the system side contact e of the changeover switches 86-1, 86-2, 86-3, and the power generator 6 is connected to the power generation side contact f via the electromagnetic contactor 88.

  The electromagnetic contactor 88 includes contacts 88-1, 88-2, 88-3, and an operation coil 88-4 that opens and closes the contacts 88-1, 88-2, 88-3. The operation coil 88-4 is connected between the R phase and the T phase that are the output of the generator 6 through the electromagnetic contactor control relay 118.

  When the system power supply 4 is normal, the changeover switches 86-1, 86-2, 86-3 are switched to the system side contact e, and the system power supply 4 is fed to the load 10-1.

  At the time of a power failure of the system power supply 4, the changeover switches 86-1, 86-2, 86-3 are switched to the power generation side contact f. When the generator 6 starts power generation, this power generation output is detected by the voltage measurement circuit 98-1. When the voltage measuring circuit 98-1 detects that the output voltage of the generator 6 has reached a predetermined voltage, the electromagnetic contactor control relay 118 is operated and the contacts 88-1, 88-2, 88-3 are closed. . Thereby, the power generation output of the generator 6 is fed to the load 10-2 through the electromagnetic contactor 88. At this time, since the changeover switches 86-1, 86-2, 86-3 are switched to the power generation side contact f, the power generation output is fed to the load 10-2.

  The current flowing from the generator 6 to the loads 10-1 and 10-2 is monitored by the control unit 102 based on the measurement value of the current measurement circuit 100.

  Even when the system power supply 4 is normal, if the generator 6 is operated, the power generation output is supplied to the load 10-2. At this time, the selector switches 86-1, 86-2, 86- of the ATS 86 are supplied. If 3 is switched to the power generation side contact f, the power generation output can be supplied to the load 10-2 side.

<Control unit 102>

  FIG. 12 shows a configuration example of the control unit 102. The control unit 102 is configured by a computer, and includes a processor 136, a storage unit 138, a communication unit 142, and an input / output unit (I / O) 144. The processor 136 executes various programs such as an OS (Operating System) and a power generation control program stored in the storage unit 138, and generates a control output. The storage unit 138 includes, for example, a ROM (Read-Only Memory) and a RAM (Random-Access Memory) as storage elements, and stores various programs such as the OS and the power generation control program described above. For example, an EEPROM (Electrically Erasable Programmable Read-Only Memory) 146 is provided as the ROM, and various data are stored in addition to the program. The RAM is used as a work area for information processing.

  The communication unit 142 exchanges data with a control unit of an external device by wire or wireless. The I / O 144 is used for inputting a detection signal and outputting a control signal. This I / O 144 includes elements on the operation panel 45, engine ASSY 18-2, fuel solenoid valve 42, power failure detection circuit 92, charging power supply circuit 94, load power supply circuit 96, voltage measurement circuits 98-1, 98-2, current A measurement circuit 100 and a dip switch 147 are connected. The dip switch 147 is used for setting a default value.

  The operation panel 45 is provided with various switch buttons operated by the user and a display as data presentation means. The operation panel 45 includes emergency stop switches 114-1 and 114-2, a display changeover switch 148, a status display element 150, an operation / stop switch 152, a segment display unit 154, a unit display unit 156, and the like. The emergency stop switches 114-1 and 114-2 are switched from the closed state to the open state by a user operation in an emergency.

<Operation mode transition and switching of AC switching relays 106-11 and 106-12>

  FIG. 13A shows switching of the AC switching relays 106-11 and 106-12. Each of the AC switching relays 106-11 and 106-12 includes a system side contact a and a power generation side contact b, and selectively switches to either one as indicated by a bidirectional arrow. Switching to the system side contact a results in system connection, and if the system power supply 4 is normal, the power supply from the system power supply 4 is effective. Moreover, if it switches to the electric power generation side contact b, it will become a generator connection and if the generator 6 is a power generation state, the electric power feeding from the output of the generator 6 will become effective.

  B of FIG. 13 shows the transition of the operation mode (state) of the power supply device 2. This operation mode includes a power OFF state M0, a first standby mode M1 when the system power supply 4 is normal, a charging mode M2, a start mode M3, a power generation mode M4, and a second standby mode when the system power supply 4 is out of power. M5, start mode M6, and power generation mode M7 are included. Each mode M0 to M7 is the contact switching state of the AC switching relays 106-11 and 106-12, that is, the above-described system connection if switching to the system side contact a, and switching to the power generation side contact b. In this case, it becomes a generator connection.

  When the system power supply 4 is normal from the power OFF state M0, or when the emergency stop switches 114-1 and 114-2 transition from ON to OFF, the standby mode M1, when the power supply of the system power supply 4 is interrupted, or the emergency stop switch 114-1 , 114-2 makes a transition to the standby mode M5 by a transition from ON to OFF. In the standby mode M1, a transition is made to the charging mode M2 due to a decrease in the battery voltage, and when the charging time has elapsed, the transition is made from the charging mode M2 to the standby mode M1. In the charging mode M2, when the system power supply 4 shifts from normal to a power failure, the mode changes to the standby mode M5.

  When the operation / stop switch 152 is switched from OFF to ON in the standby mode M1, a transition is made to the start mode M3, and the transition is automatically made from the start mode M3 to the power generation mode M4. When the operation / stop switch 152 is switched from ON to OFF in the power generation mode M4, a transition is made to the standby mode M1.

  When the operation / stop switch 152 is switched from OFF to ON in the standby mode M5, a transition is made to the start mode M6, and the transition is automatically made from the start mode M6 to the power generation mode M7. When the operation / stop switch 152 is switched from ON to OFF in the power generation mode M7, the state transits to the standby mode M5.

  Switching between the standby mode M1-M5, the start mode M3-M6, and the power generation mode M4-M7 is switched depending on whether the system power supply 4 is normal or a power failure.

  In these modes M0 to M7, switching of the AC switching relays 106-11 and 106-12 occurs in any of the following patterns.

A. B. When the system power supply 4 is normal and when the engine start mode M3 shifts to the power generation mode M4. C. When the system power supply 4 is normal, when the power generation mode M4 shifts to the standby mode M1. D. When a power failure occurs in start mode M3, M6 During a power failure of the system power supply 4, during the transition from the power generation mode M7 to the standby mode M5. System power supply 4 is restored during start-up modes M3 and M6

  Therefore, switching of the AC switching relays 106-11 and 106-12 is controlled as follows for these patterns.

  Pattern A: Switching is performed after the power generation output of the generator 6 shifts to a stable state. Thereby, contact fusion can be prevented.

  Pattern B: The end of power generation of the generator 6 is detected, the generated voltage is monitored, and switching is performed before the decrease. Thereby, if the voltage drop due to the discharge of the capacitors 28-1, 38-1 or the capacitors 28-2, 38-2 is avoided, the potential difference between the terminals can be prevented, and the contact fusion can be prevented.

  Pattern C: When a power failure of the system power supply 4 is detected, switching is performed instantaneously. Thereby, the voltage drop due to the discharge of the capacitors 28-1, 38-1 or the capacitors 28-2, 38-2 can be avoided, and the potential difference between the terminals can be prevented, so that the contact fusion can be prevented.

  Pattern D: Switching to a state where there is no power supply. For this reason, contact fusion does not occur.

  Pattern E: Avoid switching of AC switching relays 106-11 and 106-12. Thereby, contact fusion can be prevented.

<Starting control>

  FIG. 14 shows the procedure for starting control of the engine 8. In this processing procedure, it is determined whether the operation / stop switch 152 is ON (S301). If the operation / stop switch 152 is OFF (NO in S301), the OFF state, that is, the standby state is maintained, and if the operation / stop switch 152 is ON (YES in S301), the charging relay 108 is connected to the charge OFF side (contact point). d side) (S302), and engine origin check is performed (S303). In this engine origin check, it is checked whether the needle valve and the throttle are at the origin position. If it is not at the origin position in the engine origin check, the needle valve and throttle are moved to the initial positions (S304), the supply of fuel gas G is started (S305), and the cranking is started (S306).

  After the cranking, it is determined whether the engine speed is 800 [rpm] or more of the cranking stop speed (S307). If the engine speed is not higher than 800 [rpm] (NO in S307), a standby state for monitoring the engine speed is set.

  If engine speed ≧ 800 [rpm] (YES in S307), cranking is stopped (S308), and control for setting the engine speed to the target speed is started (S309).

  It is determined whether the engine speed is stable near the target speed (S310). If the engine speed is not stable in the vicinity of the target speed (NO in S310), a standby state for monitoring the engine speed is entered.

  If the engine speed is stable in the vicinity of the target speed (YES in S310), the generated voltage is measured by the voltage measuring circuits 98-1 and 98-2 (S311), and the measured voltage is abnormal. Is determined (S312). If the voltage is not normal (NO in S312), the measurement values of the voltage measurement circuits 98-1 and 98-2 are continuously monitored.

  If the voltage is normal (YES in S312), the electromagnetic contactor 88 is turned on, and supply of generated power to the load 10-2 is started (S313). In this case, if the ATS 86 is switched to the power generation side, the generated power is also supplied to the load 10-1.

  Then, the AC switching relays 106-11 and 106-12 are switched to the power generation side (contact point b side) (S314). In this case, if the system power supply 4 is normal, the AC switching relays 106-11 and 106-12 are switched to the power generation side after the power generation voltage is stabilized to avoid an inrush current.

  At this timing, the charging relay 108 is switched to the charging side (contact c side) (S315), and the battery 12 is charged with the generated power.

  In this processing procedure, the period of the process P4 of S303 to S312 is set as a power failure check period, and the power failure of the system power supply 4 is checked during this period.

  FIG. 15 shows a processing procedure for a power failure check of the system power supply 4. In this power failure check, it is determined whether the system power supply 4 has failed (S401). This power failure check may be performed based on the output of the power failure detection circuit 92.

  If the system power supply 4 fails (YES in S401), the AC switching relays 106-11 and 106-12 are switched to the power generation side contact b (S402), and the procedure returns to the start control procedure. If the system power supply 4 has not failed (NO in S401), the process skips S402 and returns to the start control procedure.

  FIG. 16 shows a processing procedure for stopping power generation. In the power generation stop processing procedure, it is determined whether the operation / stop switch 152 is ON (S501). If the operation / stop switch 152 is not ON (NO in S501), it is determined whether an abnormality has occurred (S502). In this case, the abnormality is, for example, a) an overload such as a load exceeding the power generation capacity of the generator 6, b) an abnormality of various sensors such as a hydraulic switch or a temperature sensor, c) the generated voltage of the generator 6 exceeds the correction range Such as voltage instability.

  If no abnormality has occurred (NO in S502), the process returns to S501. If the operation / stop switch 152 is not ON (NO in S501), the occurrence of the abnormality is monitored.

  If the operation switch 152 is ON (YES in S501), S502 is skipped, the charging relay 108 is switched to the charging OFF side (contact d side) (S503), and the AC switching relays 106-11 and 106-12 are switched. Switch to the system side contact a (S504). The switching to the system side contact a is performed when the system power supply 4 is normal and while the power generation of the generator 8 is effective. During the power failure of the system power supply 4, there is no power supply from the system power supply 4, so the system side Switching to the contact point a may be free.

  The electromagnetic contactor 88 is turned off (interrupted state), and power supply to the load 10-2 is stopped (S505). The supply of the fuel gas G is stopped (S506), and the control for maintaining the rotational speed of the engine 8 at the target rotational speed is stopped (S507).

  The origin of the engine 8 is moved (S508). This origin movement is an operation for returning the positions of the needle and the throttle to the origin.

  Then, it is determined whether or not the engine 8 has stopped (S509), the stop of the engine 8 is monitored, and if the engine 8 stops (YES in S509), power generation is stopped.

<Operation mode>

  As described later, the operation mode of the power supply device 2 includes a first standby mode (FIG. 17), a start mode (FIG. 18), a power generation mode (FIG. 19), and a system charge mode (FIG. 19) when the system power supply 4 is normal. 20), there is a second standby mode (FIG. 21), a start mode (FIG. 22), and a power generation mode (FIG. 23) at the time of power failure of the system power supply 4. Furthermore, when the system power supply is normal or at power failure There is an emergency stop mode (FIG. 24) and a power saving mode (FIG. 25).

  (1) First standby mode (when system power supply 4 is normal)

  FIG. 17 shows the first standby mode. In this standby mode, the AC switching relays 106-11 and 106-12 are switched to the system side contact a. As a result, the system power supply 4 is fed to the charging power supply circuit 94 and the load power supply circuit 96.

  In this standby mode, the charging relay 108 is switched to the load power circuit 96 side contact d, so that the battery 12 is disconnected from the charging power circuit 94 and connected to the load side. However, since the output voltage of the load power supply circuit 96 is higher than the battery voltage, the output of the load power supply circuit 96 has priority, and the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the fuel solenoid valve 62 are given. Is supplied with the output of the load power supply circuit 96.

  At this time, the battery 12 is directly connected to the ignition coils 70-1, 70-2, 70-3, and the starter 56, and the battery output is fed. However, since the ignition coil and the starter require little electric power during standby, the battery 12 is not consumed even if power is supplied to them.

  In this case, since the system power supply 4 is normal, the system power supply 4 is supplied to the load 10-1 through the ATS 86.

  (2) First start mode (when system power supply 4 is normal)

  FIG. 18 shows the first start mode. In this start mode, the AC switching relays 106-11 and 106-12 are switched to the system side contact a. As a result, the system power supply 4 is fed to the charging power supply circuit 94 and the load power supply circuit 96.

  In this starting mode, the charging relay 108 is switched to the load power circuit 96 side contact d, so that the battery 12 is disconnected from the charging power circuit 94 and connected to the load side. However, since the output voltage of the load power supply circuit 96 is higher than the battery voltage, the output of the load power supply circuit 96 has priority, and the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the fuel solenoid valve 62 are given. Is supplied with the output of the load power supply circuit 96.

  At this time, the battery 12 is directly connected to the ignition coils 70-1, 70-2, 70-3, and the starter 56, and the battery output is fed.

  In this case, since the system power supply 4 is normal, the system power supply 4 is supplied to the load 10-1 through the ATS 86.

  (3) Power generation mode (when system power supply 4 is normal)

  FIG. 19 shows the power generation mode. In this power generation mode, the AC switching relays 106-11 and 106-12 are switched to the power generation side contact b. As a result, the system power supply 4 is disconnected from the charging power supply circuit 94 and the load power supply circuit 96, and a power generation output is supplied to the charging power supply circuit 94 and the load power supply circuit 96 from the power generation side contact b of the AC switching relays 106-11 and 106-12. Power is supplied.

  In this power generation mode, the charging relay 108 is switched to the charging power circuit side contact c, and the battery 12 is charged by the output of the charging power circuit 94 that has received the power generation output.

  The battery 12 is disconnected from the load power circuit 96 side by switching the charging relay 108 to the charging power circuit side contact c. Therefore, the output of the load power supply circuit 96 is supplied to the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the fuel electromagnetic valve 62.

  In this case, the battery output is supplied from the battery 12 directly connected to the ignition coils 70-1, 70-2, 70-3 and the starter 56, as in the other modes.

  Since the contacts 88-1, 88-2, 88-3 of the electromagnetic contactor 88 cannot be switched to the closed state at the time when the generated voltage does not rise to the rated voltage even when the generator 6 is started, the generated voltage is a load. No power is supplied to 10-2.

  (4) Grid charge mode (when grid power supply 4 is normal)

  FIG. 20 shows the system charge mode. This system charging mode is an operation in which the battery 12 is charged by power supply on the system power supply 4 side.

  In this system charging mode, the AC switching relays 106-11 and 106-12 are switched to the system side contact a. As a result, the charging power supply circuit 94 and the load power supply circuit 96 are in a power supply state from the system power supply 4.

  At this time, the charging relay 108 is switched to the charging power circuit side contact c, and the output of the charging power circuit 94 is fed to the battery 12. As a result, the battery 12 is charged by the power on the system power supply 4 side.

  At this time, supply power to the load side is obtained from the system power supply 4 in the load power supply circuit 96. Therefore, the output of the load power supply circuit 96 receiving the output from the system power supply 4 is supplied to the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the fuel electromagnetic valve 62. The battery output is fed from the battery 12 directly connected to the ignition coils 70-1, 70-2, 70-3 and the starter 56.

  (5) Second standby mode (at power failure of system power supply 4)

  FIG. 21 shows the standby mode. At the time of power failure of the system power supply 4, in this standby mode, the power supply of the system power supply 4 is not supplied, and the charging relay 108 is switched to the load power circuit side contact d.

  In this case, only power supply from the battery 12 is performed. The battery output is fed from the battery 12 to the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, the fuel electromagnetic valve 62, the ignition coils 70-1, 70-2, 70-3, and the starter 56. .

  (6) Second start mode (system power supply 4 power failure)

  FIG. 22 shows the second start mode. At the time of starting, the AC switching relays 106-11 and 106-12 are at the system-side contact a as in the normal state of the system power supply 4.

  The charge relay 108 is switched to the load power circuit side contact d, and the output of the battery 12 supplies power to the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the fuel solenoid valve 62 via the diode 112. Is done. At this time, the battery output is fed from the battery 12 directly connected to the ignition coils 70-1, 70-2, 70-3 and the starter 56. Thereby, the generator 6 is started.

  (7) Power generation mode (at power failure of system power supply 4)

  FIG. 23 shows the power generation mode. In this power generation mode, the AC switching relays 106-11 and 106-12 are switched to the power generation side contact b. As a result, the power generation output of the generator 6 is fed to the charging power supply circuit 94 and the load power supply circuit 96. That is, the start mode is shifted to the power generation mode.

  When the generator 6 is in a power generation state, the power generation output is supplied to the charging power supply circuit 94 and the load power supply circuit 96. Since the output voltage of the load power supply circuit 96 is set higher than the output voltage of the battery 12, the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, the electromagnetic valves 62-1 and 62-2. The output of the load power supply circuit 96 is dominant in the power supply to. Although the battery output is fed from the battery 12 directly connected to the ignition coils 70-1, 70-2, 70-3 and the starter 56, the power generation of the generator 6 is maintained using the power generation output.

  (8) Emergency stop mode (when the system power supply 4 is normal)

  FIG. 24 shows an emergency stop mode when the system power supply 4 is normal. In an emergency, when the emergency stop switches 114-1 and 114-2 are operated and opened, the speed sensor 82-2, the igniter control unit 128, the needle motor 130, the throttle motor 132, and the electromagnetic valves 62-1 and 62-2 are opened. Power supply is released. If it is before starting of the generator 6, starting of the generator 6 will be blocked | prevented, and if it is driving, the drive will transfer to a stop state.

  In this case, energization of the control power circuit 104, the speed sensor 82-2, the igniter 72, the needle motor 130, and the throttle motor 132 is cut off, and standby power due to these is reduced. Although power supply from the battery 12 to the ignition coils 70-1, 70-2, 70-3 and the starter 56 is maintained, these loads do not consume standby power.

  (9) Power saving mode (system power supply 4 normal or power failure)

  FIG. 25 shows the power saving mode. In the power saving mode, the battery connection switch 110 is opened and the power supply of the battery 12 is released.

  The ignition coil 70-1, 70-2, 70-3 and the starter 56 are directly connected to the battery 12. However, since these loads do not consume standby power, if the battery connection switch 110 is opened, the battery 12 Is maintained in a no-load state, and standby power consumption can be prevented.

  (10) Operation from start mode to battery charging

  When the operation / stop switch 152 is switched from OFF to ON, the charging relay 108 is switched to the contact point d in order to stop battery charging. As the origin check, the completion of the movement of the needle and the throttle to the origin position is waited, and the needle and the throttle are moved to the initial position. The gas valve is opened to supply fuel gas to the engine 8.

  When the operation proceeds to the cranking operation and the starter motor is turned on, the rotation of the engine is started by the rotational force of the motor. When the engine 8 rotates, the igniter 72 starts an ignition operation. When the engine speed exceeds the cranking stop rotational speed (for example, 800 [rpm]), needle and throttle control (= rotational speed control) is started and cranking is stopped.

  If the cranking stop rotation speed is not reached even after a predetermined time has elapsed from the start of cranking, the cranking operation is stopped, the origin check is started, and after waiting for a predetermined time, for example, 5 seconds, Restart the ranking.

  Even if such a starting operation is performed a predetermined number of times, for example, three times, if the cranking stop rotational speed is not reached, an abnormality determination is made and an alarm is output.

  When the engine 8 rotates, stall monitoring is started, and the target engine speed is gradually increased from the initial target engine speed (for example, 1000 [rpm]) to reach the final target engine speed. In this case, if the set frequency is 50 [Hz], the final target rotational speed is, for example, 1500 [rpm], and if it is 60 [Hz], the final target rotational speed may be, for example, 1800 [rpm]. .

  It waits until the engine speed reaches a range of the final target speed ± 100 [rpm] continuously for 3 seconds, for example, as a predetermined time. That is, it waits for the stabilization time of rotation speed.

  If the above-mentioned conditions are not satisfied even if a predetermined time, for example, 20 seconds elapses after exceeding the cranking stop rotational speed, an abnormality is determined and an alarm is output.

  Then, undervoltage monitoring is started, it is confirmed that there is no voltage abnormality, and overvoltage is constantly monitored. As a voltage establishment confirmation time, after a predetermined time, for example, 2 seconds, the electromagnetic contactor 88 is switched from OFF to ON, and the AC switching relays 106-11 and 106-12 are switched to the power generation side contact b to supply power from the output of the generator 6. To do. As a predetermined time, for example, after 10 seconds, the charging relay 108 is switched to the contact c to start battery charging.

<Effect of one embodiment>

  According to the above embodiment, the following effects can be obtained.

  (1) When switching the power supply to the power supply circuits 14-1 and 14-2 from the system power supply 4 to the generator 6, or from the generator 6 to the system power supply 4, between the terminals of the capacitors 28 and 38 included in the power supply unit 14. Inrush current due to a potential difference can be avoided, and fusion between contacts due to a previous inrush current can be avoided.

  (2) It is possible to avoid inconveniences caused by charging only the system power supply 4 or charging only the power generation output, while protecting the advantages of the two-system power supply and protecting the switching contacts such as the AC switching relay used for the switch 16-1, A highly efficient power supply device can be provided.

  (3) Since the battery 12 can be charged from both the system power supply 4 and the generator 6, the degree of freedom of battery charging is high, and convenience as various systems including the power supply device 2 and the power supply device 2 can be improved. Standby power at the time of a power failure of the system power supply 4 can be suppressed, standby discharge of the battery 12 can be suppressed, and the life of the battery 12 can be extended. When the system power supply 4 is normal, the battery 12 is charged from the system power supply 4, and when the generator 6 is in operation, the battery 12 can be charged from the generator 6, and a hybrid charging system for the battery 12 can be constructed.

  (4) When the battery 12 is charged only from the system power supply 4 and the battery 12 is discharged for power generation by the generator 6 when the system power supply 4 is interrupted, the battery 12 is consumed and the operation time of the generator 6 is exceeded. Depends on the consumption of the battery 12, and there is a disadvantage that the generator 6 cannot be operated for a long time. Further, when the battery 12 is charged only from the generator 6, if the generator 6 is not operated for a long period of time, the battery 12 is consumed due to natural discharge, and it is difficult to start the engine operating unit 18-1. On the other hand, according to the hybrid charging of the above embodiment, the consumption of the battery 12 is suppressed, the battery 12 can be used for a long time, and the engine operating unit 18-1 can be operated.

  (5) Although the battery 12 can be charged from the two systems of the system power supply 4 or the generator 6, the standby current flows to the GCU 44 side when the generator 6 is stopped and the system power supply 4 is powered down. The battery 12 may be consumed. Therefore, since the circuit that requires power supply and the unnecessary circuit are separated while the power generation of the generator 6 is stopped, the consumption of the battery 12 during the power generation stop can be suppressed. As a result, the power consumption of the system power supply 4 can be suppressed during the power supply of the system power supply 4.

  (6) Since the power supply circuit is separated into the charge power supply circuit 94 and the load power supply circuit 96 for each purpose and made independent, the load connected to the battery 12 when the system power supply 4 is normal and when the engine is started at the time of the power failure Can be dispersed and reduced.

[Other Embodiments]

  a) In the above-described embodiment, the battery connection switch 110 and the emergency stop switches 114-1 and 114-2 are separately configured.

  b) In the above embodiment, the relay is illustrated as an example of the switches 16-1 and 16-2, but switching means other than the relay may be used.

  c) Although the backflow prevention means 20 is described in the first embodiment and the second embodiment, it may be omitted. For example, a backflow prevention measure may be provided on the power supply unit 14 side.

As described above, the most preferable embodiment of the present invention has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the specification. It goes without saying that such modifications and changes are included in the scope of the present invention.

The present invention relates to a control technology of a power supply device used for charging a battery that supplies power to an engine generator mounted on a cogeneration system or the like, and prevents fusion due to an inrush current of a switching contact by power supply switching, and a low current of a relay This makes it possible to realize a highly reliable power supply device that prevents contact fusion, for example, and is useful.

2 power supply device 4 system power supply 6 generator 8 engine 10, 10-1, 10-2 load 12 battery 14 power supply unit 14-1 first power supply circuit 14-2 second power supply circuit 16 switching means 16-1 first Switch a system side contact b power generation side contact 16-11, 16-12, 16-21, 16-22 switch 16-2, 16-3 second switch 17 switching control unit 18-1 engine operating unit 18-2 Engine ASSY
18-21 System / power generation / battery load section 18-22 Battery load section 20 Backflow prevention means 22, 22-1, 22-2 Rectifier 24, 24-1, 24-2 Smoothing section 26, 26-1, 26- 2 DCDC converter 28, 28-1, 28-2 Capacitor 30, 30-1, 30-2 Switching unit 32, 32-1, 32-2 Transformer unit 34, 34-1 and 34-2 Rectifier unit 36, 36- DESCRIPTION OF SYMBOLS 1, 36-2 Smoothing part 38, 38-1, 38-2 Capacitor 42 Apparatus housing 44 Power generation control unit (GCU)
45 Operation panel 46 Automatic voltage regulator (AVR)
48 Fuel Supply Unit 50 Intake Unit 52 Mixer 54 Ignition Unit 56 Starter 58 Coolant Unit 60 Exhaust Unit 62 Fuel Electromagnetic Valve 62-1 Electromagnetic Valve (MV)
62-2 Solenoid valve (SV)
64 Gas regulator 66 Mixer drive unit 68-1, 68-2, 68-3 Spark plug 70-1, 70-2, 70-3 Ignition coil 72 Igniter 74 Water pump 76 Radiator 78 Radiator fan 80 Muffler 82-1 Temperature sensor 82-2 Speed sensor 82-3 Cam position sensor 82-4 Hydraulic switch 84 Surge absorption circuit 86 Automatic changeover switch (ATS)
88 Magnetic contactor 88-1, 88-2, 88-3 Contact 88-4 Operation coil 90 Filter 92 Power failure detection circuit 94 Charging power supply circuit 96 Load power supply circuit 98-1, 98-2 Voltage measurement circuit 100 Current measurement circuit 102 Control unit 104 Control power supply circuit 106-11, 106-12 AC switching relay 108 Charging relay 110 Battery connection switch 112 Diode 114-1, 114-2 Emergency stop switch 116 Temperature sensor in housing 118 Magnetic contactor control relay 128 Igniter control unit DESCRIPTION OF SYMBOLS 130 Needle motor 132 Throttle motor 136 Processor 138 Memory | storage part 140 Power supply circuit 142 Communication part 144 Input / output part (I / O)
146 EEPROM
148 Display changeover switch 150 Status display element 152 Run / stop switch 154 Segment display unit 156 Unit display unit 160 Operating coil

Claims (4)

A generator that generates power by receiving the driving force of the engine;
A battery for supplying power to at least the engine;
A first power supply circuit for outputting a first power fed to the battery, and a second power supply unit for Ru and a power supply circuit for outputting a second power fed to the engine,
First switching means for switching to either the connection between the power supply unit and the system power supply or the connection between the power supply unit and the generator;
Second switching means for switching to either the connection between the battery and the first power supply circuit or the connection between the battery and the second power supply circuit;
A switching control unit for controlling the first switching unit and the second switching unit;
The switching control unit includes:
When the system power supply is normal, the first switching means is connected to the power supply unit and the system power supply, and the second switching means is connected to the battery and the second power supply circuit. wherein activates the engine by feeding from the system power source and the battery to start the said generator, the power output of the previous Symbol generator is maintained in the system power supply the power supply to the power supply unit until the transition to a stable state, When transitioning to the stable state, the first switching means is switched to the connection between the power supply unit and the generator to switch the power supply to the power supply unit from the system power supply to the generator,
When the power generation of the generator is terminated , before the power generation voltage of the generator decreases , the first switching means is switched to the connection between the power supply unit and the system power supply to supply power to the power supply unit. Switch from the generator to the grid power supply,
Alternatively, when a power failure occurs in the system power supply, when the power failure is detected, the second switching means is switched to the connection between the battery and the second power supply circuit, and the engine is started by supplying power from the battery. the generator power was the start of the first switching means is switched to the power supply from the generator, the power supply device comprising a switching Turkey power supply to the power supply unit to the generator from the system power supply .   2. The power supply device according to claim 1, wherein the power supply unit includes a storage element through which a charging current flows when receiving the output of the system power supply or the generator on at least one or both of an input side and an output side. A method for controlling a power supply device including a generator that is fed from a system power supply and generates power by receiving the driving force of an engine,
Supplying power to at least the engine from a battery;
Either one or both of the first power supplied to the battery from the first power supply circuit of the power supply unit and the second power supplied to the engine from the second power supply circuit of the power supply unit are output. Process,
When the system power supply is normal, the first switching means for switching between the connection between the power supply unit and the system power supply or the connection between the power supply unit and the generator is the connection between the power supply unit and the system power supply. And a second switching means for switching between the connection between the battery and the first power supply circuit or the connection between the battery and the second power supply circuit, and the connection between the battery and the second power supply circuit. with the by the power supply from the system power source and the battery to start the said generator activates the engine, the system power supply to the power supply unit to the power output of the generator shifts to a stable state maintaining the power supply, the when a transition to a stable state, the first switching the power supply unit is switched to connect the unit from the connection between the system power supply and the power supply unit and the power supply unit and the generator Switch to the generator power from the system power source against,
When the power generation of the generator is terminated , before the power generation voltage of the generator decreases , the first switching means is connected from the connection between the power supply unit and the generator to the power supply unit and the system power supply. Switch to connection, switch the power supply to the power supply unit from the generator to the system power supply,
Alternatively, when a power failure occurs in the system power supply, when the power failure is detected, the second switching means is switched to the connection between the battery and the second power supply circuit, and the engine is started by supplying power from the battery. Power generation of the generator is started, and the first switching unit is switched from connection between the power supply unit and the system power supply to connection between the power supply unit and the generator to supply power to the power supply unit from the system power supply. Any process or two or more processes selected from these processes to switch to the generator;
A control method for a power supply apparatus comprising: A control program to be executed by a computer mounted on a power supply apparatus including a generator that is fed from a system power supply and receives power generated by an engine and generates power,
A function of supplying power to at least the engine from a battery;
Either or both of the first power supplied to the battery by the first power supply circuit of the power supply unit and the second power supplied to the engine from the second power supply circuit of the power supply unit are output. Function and
When the system power supply is normal, the first switching means for switching between the connection between the power supply unit and the system power supply or the connection between the power supply unit and the generator is the connection between the power supply unit and the system power supply. And a second switching means for switching between the connection between the battery and the first power supply circuit or the connection between the battery and the second power supply circuit, and the connection between the battery and the second power supply circuit. with the by the power supply from the system power source and the battery to start the said generator activates the engine, the system power supply to the power supply unit to the power output of the generator shifts to a stable state maintaining the power supply, the when a transition to a stable state, the first switching the power supply unit is switched to connect the unit from the connection between the system power supply and the power supply unit and the power supply unit and the generator Switch to the generator power from the system power source against,
When the power generation of the generator is terminated , before the power generation voltage of the generator decreases , the first switching means is connected from the connection between the power supply unit and the generator to the power supply unit and the system power supply. Switch to connection, switch the power supply to the power supply unit from the generator to the system power supply,
Alternatively, when a power failure occurs in the system power supply, when the power failure is detected, the second switching means is switched to the connection between the battery and the second power supply circuit, and the engine is started by supplying power from the battery. Power generation of the generator is started, and the first switching unit is switched from connection between the power supply unit and the system power supply to connection between the power supply unit and the generator to supply power to the power supply unit from the system power supply. Two or more functions selected from any one of these functions, or these functions to be switched to the generator;
A control program for the power supply apparatus for causing the computer to execute the program.