JP6659529B2 - Power supply - Google Patents

Description

  The present invention relates to a power supply device, and more particularly, to a power supply device including a power supply, a capacitor, and a relay.

  Conventionally, as a power supply device of this type, a battery that supplies power to a motor via a positive bus and a negative bus, a capacitor connected to the positive bus and the negative bus, a positive relay provided on the positive bus, There has been proposed a device including a negative-electrode relay provided on a negative bus, and a transistor and a limiting resistor connected in parallel to the positive-electrode relay and in series with each other (for example, see Patent Document 1). In this power supply device, when the system startup operation is performed, the transistor and the negative relay are turned on to start precharging the capacitor. When the voltage of the capacitor reaches a predetermined voltage, the positive relay is turned on and the transistor is turned off.

JP 2005-212156 A

  In such a power supply device, when the temperature of the limiting resistor is equal to or higher than a predetermined temperature when the system startup operation is performed, the capacitor is precharged in order to prevent the limiting resistor from being overheated due to the precharging of the capacitor. It is also considered to ban. If the transistor and the negative side relay are turned off regardless of the temperature of the limiting resistor when the system stop operation is performed during the precharging of the capacitor, the temperature of the limiting resistor will be increased the next time the system start operation is performed. Cannot precharge the capacitor at a predetermined temperature or higher (the positive and negative relays cannot be turned on), that is, the system cannot be started (the motor can be driven).

  A power supply device according to the present invention has a main object to make it possible to surely perform a system startup state when a system startup operation is performed.

  The power supply device of the present invention employs the following means in order to achieve the above-mentioned main object.

The power supply device of the present invention
A power supply for supplying electric power to the electric device via a power line,
A capacitor attached to the power line;
A positive side relay and a negative side relay provided on the power supply side with respect to the capacitor of the positive side line and the negative side line of the power line, and a precharge relay and a limiting resistor bypass the positive side relay or the negative side relay. A relay having a precharge circuit connected in series to
A control device for controlling the relay,
With
The control device, when a system start operation is performed,
When the temperature of the limiting resistor is lower than a predetermined temperature, the positive side relay and the precharge relay are turned on to start precharging the capacitor, and after the completion of the precharge, the negative side relay is turned on. Turn off the precharge relay and put the system in a start-up state,
When the temperature of the limiting resistor is equal to or higher than the predetermined temperature, the precharge is prohibited.
A power supply,
The control device, when a system stop operation is performed during the precharge,
When the temperature of the limiting resistor is less than the predetermined temperature, turn off the positive side relay and the precharge relay,
When the temperature of the limiting resistor is equal to or higher than the predetermined temperature, the precharge is continued, and after the completion of the precharge, the negative side relay is turned on and the precharge relay is turned off. Hold until system startup operation is performed,
That is the gist.

  In the power supply device of the present invention, when the temperature of the limiting resistor is lower than the predetermined temperature when the system start operation is performed, the positive side relay and the precharge relay are turned on to start precharging of the capacitor, and After the completion of the above operation, the negative side relay is turned on and the precharge relay is turned off to bring the system into a start-up state (a state in which the electric device can be driven). When the temperature of the limiting resistor is equal to or higher than a predetermined temperature, the precharge is prohibited. Then, when the system stop operation is performed during the precharge, if the temperature of the limiting resistor is lower than the predetermined temperature, the positive side relay and the precharge relay are turned off. The charging is continued, and after the completion of the precharge, the negative side relay is turned on and the precharge relay is turned off, and this state is held until the next system start operation is performed. Thus, even when the temperature of the limiting resistor is equal to or higher than the predetermined temperature when the system start operation is performed, the system can be brought into the system start state because the positive side relay and the negative side relay are on.

  In such a power supply device according to the present invention, the control device may be configured to perform the restriction when the system stop operation is performed after the precharge is completed and the positive side relay and the negative side relay are turned on. When the temperature of the resistor is lower than the predetermined temperature, the positive relay and the negative relay are turned off. When the temperature of the limiting resistor is equal to or higher than the predetermined temperature, the positive relay and the negative relay are turned on. May be held.

FIG. 1 is a configuration diagram schematically illustrating a configuration of an electric vehicle 20 equipped with a power supply device as one embodiment of the present invention. 5 is a flowchart illustrating an example of a processing routine executed by the electronic control unit 50. 5 is a flowchart illustrating an example of a temperature estimation routine executed by the electronic control unit 50.

  Next, an embodiment for carrying out the present invention will be described using an embodiment.

  FIG. 1 is a configuration diagram schematically showing a configuration of an electric vehicle 20 equipped with a power supply device as one embodiment of the present invention. As shown, the electric vehicle 20 according to the embodiment includes a motor 32 and an inverter 34 as electric devices, a battery 36 as a power supply, a boost converter 40, capacitors 46 and 48, a system main relay SMR, and an electronic control unit. And a unit 50. Here, the “power supply device” of the embodiment corresponds to the battery 36, the capacitors 46 and 48, the system main relay SMR, and the electronic control unit 50.

  The motor 32 is configured as a synchronous generator motor, and includes a rotor in which permanent magnets are embedded, and a stator in which a three-phase coil is wound. The rotor of the motor 32 is connected to a drive shaft 26 connected to the drive wheels 22a and 22b via a differential gear 24.

  The inverter 34 is used to drive the motor 32 and is connected to the high-voltage power line 42. The inverter 34 includes six transistors T11 to T16 and six diodes D11 to D16 connected in parallel to the transistors T11 to T16 in opposite directions. The transistors T <b> 11 to T <b> 16 are arranged in pairs each of which is on the source side and the sink side with respect to the positive line and the negative line of the high voltage power line 42. Each of the three-phase coils (U-phase, V-phase, W-phase) of the motor 32 is connected to each of the connection points of the pair of transistors T11 to T16. Therefore, when a voltage is applied to the inverter 34, the electronic control unit 50 adjusts the ratio of the on-time of the pair of transistors T11 to T16, thereby forming a rotating magnetic field in the three-phase coil, and 32 is driven to rotate.

  The battery 36 is configured as, for example, a lithium ion secondary battery or a nickel hydride secondary battery, and is connected to the low-voltage power line 44. The boost converter 40 is connected to the high-voltage power line 42 and the low-voltage power line 44, and has two transistors T31 and T32 and two diodes D31 and D31 connected in parallel to the transistors T31 and T32 in opposite directions. D32 and a reactor L. The transistor T31 is connected to the positive line of the high-voltage power line 42. The transistor T32 is connected to the transistor T31 and the negative side lines of the high voltage side power line 42 and the low voltage side power line 44. The reactor L is connected to a connection point between the transistors T31 and T32 and a positive line of the low-voltage power line 44. The boost converter 40 boosts the power of the low-voltage power line 44 and supplies it to the high-voltage power line 42 by adjusting the ratio of the ON time of the transistors T31 and T32 by the electronic control unit 50. The power of the high-voltage power line 42 is stepped down and supplied to the low-voltage power line 44.

  The capacitor 46 is attached to the positive line and the negative line of the high-voltage power line 42. The capacitor 48 is attached to the positive line and the negative line of the low-voltage power line 44.

  The system main relay SMR is provided on the battery 36 side of the capacitor 48 in the low-voltage power line 44. The system main relay SMR includes a positive side relay SB provided on the positive side line of the low voltage side power line 44, a negative side relay SG provided on the negative side line of the low voltage side power line 44, and a precharge relay. A precharge circuit SC connected in series so that the SP and the limiting resistor SR bypass the negative relay SG. Here, when supplying power from the battery 36 to the inverter 34 side, the precharge circuit SC charges the capacitors 46 and 48 before turning on the positive relay SB and the negative relay SG (precharge is performed. ). The system main relay SMR is connected and disconnected between the battery 36 and the capacitor 48 by being turned on and off by the electronic control unit 50.

  The electronic control unit 50 is configured as a microprocessor mainly including a CPU 52, and includes, in addition to the CPU 52, a ROM 54 for storing a processing program, a RAM 56 for temporarily storing data, and an input / output port. Signals from various sensors are input to the electronic control unit 50 via input ports. The signals input to the electronic control unit 50 include, for example, the rotation position θm of the rotor of the motor 32 from the rotation position detection sensor 32a that detects the rotation position of the rotor of the motor 32, and the signal flowing to each phase of the motor 32. Phase currents Iu and Iv flowing from the current sensor that detects the current to the motor 32 can be given. Further, the voltage Vb of the battery 36 from a voltage sensor attached between the terminals of the battery 36 and the current Ib of the battery 36 from a current sensor attached to the output terminal of the battery 36 can also be mentioned. Further, the voltage VH of the capacitor 46 (the high-voltage power line 42) from the voltage sensor 46a attached between the terminals of the capacitor 46 and the capacitor 48 (the low voltage) from the voltage sensor 48a attached between the terminals of the capacitor 48 The voltage VL of the side power line 44) and the temperature Tsr of the limiting resistor SR from the temperature sensor 49 attached near the limiting resistor SR of the precharge circuit SC of the system main relay SMR can also be mentioned. In addition, an ignition signal from the ignition switch 60 and a shift position SP from a shift position sensor 62 for detecting an operation position of the shift lever 61 can be also mentioned. The accelerator opening Acc from an accelerator pedal position sensor 64 for detecting the amount of depression of the accelerator pedal 63, the brake pedal position BP from the brake pedal position sensor 66 for detecting the amount of depression of the brake pedal 65, and the acceleration from the vehicle speed sensor 68. The vehicle speed V can also be mentioned. Various control signals are output from the electronic control unit 50 via output ports. Examples of the signal output from the electronic control unit 50 include a switching control signal to the transistors T11 to T16 of the inverter 34 and a switching control signal to the transistors T31 and T32 of the boost converter 40. The electronic control unit 50 calculates the electrical angle θe and the rotation speed Nm of the motor 32 based on the rotation position θm of the rotor of the motor 32 from the rotation position detection sensor 32a.

  In the electric vehicle 20 of the embodiment configured as described above, the electronic control unit 50 performs the following traveling control. In the traveling control, a required torque Td * required for the drive shaft 26 is set based on the accelerator opening Acc and the vehicle speed V, and the set required torque Td * is set as a torque command Tm * of the motor 32. Are controlled by the torque command Tm * to control the switching of the transistors T11 to T16 of the inverter 34. The target voltage VH * of the high-voltage power line 42 is set so that the motor 32 can be driven by the torque command Tm *, and the step-up converter 40 sets the voltage VH of the high-voltage power line 42 to the target voltage VH *. Of the transistors T31 and T32.

  Next, the operation of the electric vehicle 20 according to the embodiment configured as described above, particularly, the operation when the electric vehicle 20 is ready-on in response to the ON operation of the ignition switch 60, that is, when the system is activated will be described. FIG. 2 is a flowchart illustrating an example of a processing routine executed by the electronic control unit 50. This routine is repeatedly executed. At the start of the execution of the processing routine in FIG. 2, the system main relay SMR is turned off (all of the positive side relay SB, the negative side relay SG, and the precharge relay SP are turned off), as can be seen from step S220 described later. I have.

  When the processing routine of FIG. 2 is executed, electronic control unit 50 waits for turning-on of ignition switch 60 (step S100). Then, when the ignition switch 60 is turned on, the temperature Tsr of the limiting resistor SR of the precharge circuit SC is input (step S110), and the input temperature Tsr of the limiting resistor SR is compared with a threshold value Tsrref (step S120). . Here, the value detected by the temperature sensor 49 is input as the temperature Tsr of the limiting resistor SR. The threshold value Tsrref determines whether or not the pre-charging of the capacitors 46 and 48 may cause the limiting resistor SR to overheat (abnormality) due to a temperature rise of the limiting resistor SR during the pre-charging. For example, 170 ° C., 180 ° C., 190 ° C., or the like can be used.

  If the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref in step S120, it is determined that the pre-charging of the capacitors 46 and 48 may cause the limiting resistor SR to overheat, and the positive relay SB of the system main relay SMR is determined. Then, the precharge relay SP is turned on to inhibit charging of the capacitors 46 and 48 (precharge) (step S130), and the process returns to step S100. That is, the system main relay SMR is kept off (all the positive side relay SB, the negative side relay SG, and the precharge relay SP are off). This prevents the limiting resistor SR from overheating. In this case, it waits for the next time the ignition switch 60 is turned on again.

  When the temperature Tsr of the limiting resistor SR is lower than the threshold Tsrref in step S120, it is determined that the possibility that the limiting resistor SR will be overheated is sufficiently low even if the capacitors 46 and 48 are precharged, and the positive electrode of the system main relay SMR is determined. The side relay SB and the precharge relay SP are turned on to start charging (precharge) the capacitors 46 and 48 (step S140). When the positive relay SB and the precharge relay SP are turned on, the positive relay of the battery 36, the positive relay SB, the first branch (reactor L, diode D31, capacitor 46) and the second branch (capacitor 48), A circuit of the limiting resistor SR, the precharge relay SP, and the negative electrode of the battery 36 is formed, and the precharge of the capacitors 46 and 48 is started.

  When the precharging of the capacitors 46 and 48 is started in this way, it is determined whether or not the precharging of the capacitors 46 and 48 is completed (step S150). Here, whether or not the precharging of the capacitors 46, 48 has been completed is determined, for example, by whether the voltages VH, VL of the capacitors 46, 48 from the voltage sensors 46a, 48a have reached a threshold Vref or higher at which the precharging can be completed. It can be performed by determining whether or not it is not. As the threshold value Vref, a value lower than the voltage Vb of the battery 36 by about several volts to several tens of volts can be used.

  If the precharging of the capacitors 46 and 48 has not been completed in step S150, it is determined whether or not the ignition switch 60 has been turned off (step S160). If the ignition switch 60 has not been turned off, It returns to step S150. When the precharging of the capacitors 46 and 48 is completed in step S150 without turning off the ignition switch 60 in this way, the negative relay SG is turned on while the positive relay SB and the precharge relay SP are turned on. By turning off the precharge relay SP, a connection process of the system main relay SMR (a process of turning on the positive side relay SB and the negative side relay SG) is performed (step S170), and the system is ready-on, that is, the system is activated (step S170). The motor 32 and the inverter 34 are driven (step S180).

  Next, the process waits for the turning-off operation of the ignition switch 60 (step S190). Then, when the ignition switch 60 is turned off, the temperature Tsr of the limiting resistor SR of the precharge circuit SC is input (step S200), and the input temperature Tsr of the limiting resistor SR is compared with a threshold value Tsrref (step S210). .

  When the temperature Tsr of the limiting resistor SR is lower than the threshold value Tsrref in step S210, the positive relay SB and the negative relay SG are turned off from the on state of the positive relay SB and the negative relay SG, thereby turning off the system main relay SMR. A shutoff process (a process of turning off all of the positive-side relay SB, the negative-side relay SG, and the precharge relay SP) is performed (step S220), and the routine ends. Then, the next time the ignition switch 60 is turned on (step S100), since the temperature Tsr of the limiting resistor SR is lower than the threshold value Tsrref (steps S110, S120), the processing after step S140 can be executed. it can.

  If the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref in step S210, it is determined whether or not the ignition switch 60 has been turned on (step S280). If the ignition switch 60 has not been turned on, the process proceeds to step S280. It returns to S200. If the ignition switch 60 is not turned on and the temperature Tsr of the limiting resistor SR becomes lower than the threshold value Tsrref in step S210 while the processes of steps S200, S210, and S280 are repeatedly executed, the system main The relay SMR is shut off (step S220), and the routine ends. On the other hand, when the processes of steps S200, S210, and S280 are repeatedly executed, when the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref and the ignition switch 60 is turned on, the system is ready-on, that is, the system is in the activated state. (Step S180), the processing after Step S190 is executed. As described above, even if the ignition switch 60 is turned off in step S190, if the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref in step S210, the process of shutting off the system main relay SMR is not performed. When the ignition switch 60 is turned on, a ready-on operation, that is, a system start-up state can be performed without precharging the capacitors 46 and 48.

  In steps S150 and S160, when the ignition switch 60 is turned off while the capacitors 46 and 48 are being precharged, the temperature Tsr of the limiting resistor SR is input (step S230), and the input temperature Tsr of the limiting resistor SR is input. Is compared with a threshold value Tsrref (step S240). When the temperature Tsr of the limiting resistor SR is lower than the threshold value Tsrref, the system main relay SMR is shut off by turning off the positive side relay SB and the precharge relay SP from the on state of the positive side relay SB and the precharge relay SP. The process is performed (step S220), and the present routine ends. Then, the next time the ignition switch 60 is turned on (step S100), since the temperature Tsr of the limiting resistor SR is lower than the threshold value Tsrref (steps S110, S120), the processing after step S140 can be executed. it can.

  If the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref in step S240, the precharge of the capacitors 46 and 48 is continued by holding the positive relay SB and the precharge relay SP on (step S250). Wait for the completion of the 48 precharges (step S260). When the precharging of the capacitors 46 and 48 is completed, the negative relay SG is turned on and the precharge relay SP is turned off from the state where the positive relay SB and the precharge relay SP are turned on, thereby turning off the system main relay SMR. Is performed (step S270), and the processing after step S280 is executed. Thus, as described above, when the ignition switch 60 is turned on in step S280, the capacitors 46 and 48 can be ready-on, that is, the system can be put into a system startup state without precharging the capacitors 46 and 48.

  In the electric vehicle 20 of the embodiment described above, when the temperature Tsr of the limiting resistor SR is lower than the threshold value Tsrref when the system start-up operation (the operation of turning on the ignition switch 60) is performed, the positive relay SB and the precharge relay SP is turned on to start precharging of the capacitors 46 and 48. After the precharge is completed, the negative side relay SG is turned on and the precharge relay SP is turned off to be ready-on, that is, the system is in a start-up state (the motor 32 and the inverter 34 are turned off). Drivable state). On the other hand, if the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold Tsrref when the system start operation is performed, the precharge of the capacitors 46 and 48 is prohibited. When the system stop operation (the operation of turning off the ignition switch 60) is performed during the precharging of the capacitors 46 and 48, and the temperature Tsr of the limiting resistor SR is lower than the threshold Tsrref, the positive relay SB and the precharge relay When the SP is turned off and the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref, the precharge of the capacitors 46 and 48 is continued, and after the precharge is completed, the negative side relay SG is turned on and the precharge relay SP is turned off. And the state is held for the next system startup operation. Accordingly, even when the temperature Tsr of the limiting resistor SR is equal to or higher than the threshold value Tsrref when the system start operation is performed, the ready-on state, that is, the system start-up is performed because the positive relay SB and the negative relay SG are on. (The motor 32 and the inverter 34 can be driven).

  In the electric vehicle 20 of the embodiment, the temperature Tsr of the limiting resistor SR uses a value detected by a temperature sensor 49 attached near the limiting resistor SR of the precharge circuit SC. However, the temperature Tsr of the limiting resistor SR may use a value estimated by the temperature estimation routine of FIG. The temperature estimation routine of FIG. 3 is repeatedly executed by the electronic control unit 50.

  When the temperature estimation routine of FIG. 3 is executed, the electronic control unit 50 determines whether or not the capacitors 46 and 48 are being precharged (step S300). It is determined whether or not the precharge of steps 46 and 48 has started (step S310). Then, when the precharging of the capacitors 46 and 48 is started, a value obtained by adding a predetermined value ΔCsr to the previous limited resistance temperature counter (previous Csr) is set to a new limited resistance temperature counter Csr (step S320). Here, the limiting resistance temperature counter Csr is a counter used for estimating the temperature Tsr of the limiting resistance SR. Further, the predetermined value ΔCsr is determined as a value corresponding to a temperature rise due to heat generation of the limiting resistor SR when the capacitors 46 and 48 are precharged. For example, 18, 20, 22, or the like can be used. .

  Subsequently, the limiting resistance heat dissipation counter Cra is reset to a value of 0 (step S330), the temperature Tsr of the limiting resistor SR is estimated based on the limiting resistance temperature counter Csr (step S380), and this routine ends. Here, the limiting resistance heat dissipation counter Cra is a counter used to determine whether to subtract the limiting resistance temperature counter Csr. The temperature Tsr of the limiting resistor SR can be estimated by, for example, multiplying the limiting resistor temperature counter Csr by a conversion coefficient ksr.

  When the precharge of the capacitors 46 and 48 is not started in step S310, the value of the limiting resistance heat dissipation counter Cra is set to 0 without executing the processing of step S320 (step S330), and the limiting is performed based on the limiting resistance temperature counter Csr. The temperature Tsr of the resistor SR is estimated (step S380), and this routine ends.

  If the capacitors 46 and 48 are not being precharged in step S300, a value obtained by adding 1 to the previous limited resistance heat dissipation counter (previous Cra) is set in a new limited resistance heat dissipation counter Cra (step S340), and the limited resistance heat dissipation counter Cra is set. The counter Cra is compared with a threshold value Craref (step S350). Here, as the threshold value Craref, for example, a value corresponding to about several seconds to about ten seconds can be used.

  If the limiting resistance heat dissipation counter Cra is equal to or greater than the threshold value Craref in step S350, a value obtained by subtracting the value 1 from the previous limiting resistance temperature counter (previous Csr) and guarding the lower limit with the value 0 is set as a new limiting resistance temperature counter Csr. (Step S360), the limiting resistor heat dissipation counter Cra is reset to a value of 0 (Step S370), the temperature Tsr of the limiting resistor SR is estimated based on the limiting resistor temperature counter Csr (Step S380), and this routine ends. I do.

  When the limiting resistance heat dissipation counter Cra is less than the threshold value Craref in step S350, the processing of steps S360 and S370 is not performed, and the temperature Tsr of the limiting resistor SR is estimated based on the limiting resistance temperature counter Csr (step S380). This routine ends.

  Thus, by estimating the temperature Tsr of the limiting resistor SR based on the limiting resistor temperature counter Csr, the temperature Tsr of the limiting resistor SR can be estimated without providing the temperature sensor 49.

  In the electric vehicle 20 of the embodiment, the battery 36 is used as a power source, but a capacitor may be used.

  Although the electric vehicle 20 according to the embodiment includes the boost converter 40, the electric vehicle 20 may not include the boost converter 40.

  In the embodiment, the configuration of the electric vehicle 20 including the traveling motor 32 is adopted. However, a configuration of a hybrid vehicle including an engine in addition to the motor for traveling may be adopted.

  In the embodiment, the vehicle is in the form of an automobile. However, the embodiment may be in the form of a power supply mounted on an automobile, or may be in the form of a power supply incorporated in a stationary facility such as construction equipment.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of "Means for Solving the Problems" will be described. In the embodiment, the battery 36 corresponds to a “power source”, the capacitors 46 and 48 correspond to a “capacitor”, the system main relay SMR corresponds to a “relay”, and the electronic control unit 50 corresponds to a “control device”. .

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the section of the means for solving the problem is as follows. This is merely an example for specifically describing a mode for carrying out the invention, and thus does not limit the elements of the invention described in the section of “Means for Solving the Problems”. That is, the interpretation of the invention described in the section of the means for solving the problem should be interpreted based on the description of the section, and the embodiment is not limited to the invention described in the section of the means for solving the problem. This is only a specific example.

  As described above, the embodiments for carrying out the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments at all, and various forms may be provided without departing from the gist of the present invention. Of course, it can be implemented.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a power supply device manufacturing industry and the like.

  Reference Signs List 20 electric vehicle, 22a, 22b drive wheel, 24 differential gear, 26 drive shaft, 32 motor, 32a rotational position detection sensor, 34 inverter, 36 battery, 40 boost converter, 42 high voltage side power line, 44 low voltage side power line , 46, 48 capacitors, 46a, 48a voltage sensor, 49 temperature sensor, 50 electronic control unit, 52 CPU, 54 ROM, 56 RAM, 60 ignition switch, 61 shift lever, 62 shift position sensor, 63 accelerator pedal, 64 accelerator pedal Position sensor, 65 brake pedal, 66 Brake pedal position sensor, 68 Vehicle speed sensor, D11 to D16, D31, D32 Diode, L reactor, T11 to T16, T31, T32 Jista.

Claims (1)

A power supply for supplying electric power to the electric device via a power line,
A capacitor attached to the power line;
A positive-side relay and a negative-side relay provided on the power supply side than the capacitors of the positive-side line and the negative-side line of the power line, and a precharge relay and a limiting resistor bypass the positive-side relay or the negative-side relay. A relay having a precharge circuit connected in series to
A control device for controlling the relay,
With
The control device, when a system start operation is performed,
When the temperature of the limiting resistor is lower than a predetermined temperature, the positive side relay and the precharge relay are turned on to start precharging the capacitor, and after the completion of the precharge, the negative side relay is turned on. Turn off the precharge relay and put the system in a start-up state,
When the temperature of the limiting resistor is equal to or higher than the predetermined temperature, the precharge is prohibited.
A power supply,
The control device, when a system stop operation is performed during the precharge,
When the temperature of the limiting resistor is less than the predetermined temperature, turn off the positive side relay and the precharge relay,
When the temperature of the limiting resistor is equal to or higher than the predetermined temperature, the precharge is continued, and after the completion of the precharge, the negative side relay is turned on and the precharge relay is turned off. Hold until system startup operation is performed,
Power supply.

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