JP4876870B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic apparatus provided with a power supply to which a circuit for controlling a peak cut circuit is added.

  Conventionally, as a multi-output type switching power supply, for example, a circuit diagram shown in FIG. 6 is disclosed. This power source is a bridge diode R for rectifying the commercial power source E, a switching element Q1 for switching the rectified DC voltage via the primary side coil NP, and transforming the voltage switched by the coil NP to provide two secondary The transformer T that outputs to the side coils NS1 and NS2, the diode D1 that rectifies the AC voltage output from the secondary coil NS1 into a DC voltage of 13 volts, and the AC voltage output from the secondary coil NS2 is 5 A diode D2 that rectifies to a DC voltage of volts and a feedback circuit 80 that monitors the DC voltage of 5 volts and controls the switching of the switching element Q1 so as to always maintain this voltage are provided.

  Further, a smoothing capacitor C1 is provided in parallel with the output of the bridge diode R, and smoothing capacitors C2 and C3 are provided on the output side of the diodes D1 and D2, respectively. Further, a peak cut circuit 81 is provided between the 13 volt output line and the 5 volt output line. A terminal 82 is connected to the 13 volt output line, a terminal 83 is connected to the 5 volt output line, and a terminal 84 is connected to the common voltage 0 volt line.

  In this power source, even if a load (not shown) connected to the 5 volt line fluctuates, the voltage of 5 volt is accurately maintained, and the 13 volt line side does not perform accurate voltage control. However, when the load on the 5 volt line becomes heavy, the on-time of the switching element Q1 becomes longer, resulting in an increase in the voltage of the coil NS1 and an increase in the potential of the 13 volt line.

  Generally, a relatively large load such as a stepping motor or a solenoid is often connected to the terminal 82 (13 volt side), and an accurate voltage is not necessary. However, for example, when this voltage becomes 15 volts or more. The temperature rise due to the heat generated by the stepping motor and the wasteful current consumption increase.

  For this reason, in a multi-output type switching power supply, a peak cut circuit is often provided in a power supply that outputs an unstabilized voltage. This peak cut circuit basically sends a short-circuit current (bypass current) to the output when a voltage of a certain level or more is applied, and as a result, a line where an unstabilized voltage is output, the circuit of FIG. In this case, the terminal 82 (on the side of 13 volts) is prevented from becoming a voltage exceeding a certain level, and a constant voltage diode is generally used.

  The peak cut circuit 81 shown in FIG. 6 is a circuit in which the Zener current is increased by the transistor Q2 because the current capacity of the constant voltage diode DZ is small. The peak cut circuit 81 is connected in series with the resistor R3 and the collector-emitter of the transistor Q2 in series between the 13 volt line and the 5 volt line, and is arranged in series with the resistor R4 connected to the 13 volt line. The constant voltage diode DZ is connected to the base of the transistor Q2.

  Therefore, when the voltage of the 13 volt line exceeds a predetermined voltage value determined by the constant voltage diode DZ, for example, 13 volt, the base current of the transistor Q2 flows, and the bypass current flows from the 13 volt line side to the 5 volt line side. It is designed to suppress the voltage rise of the 13 volt line.

  Further, when a current flows between the collector and the emitter of the transistor Q2, the potential of the 5 volt line is increased, the feedback circuit 80 works to suppress this increase, and the on-time of the switching element Q1 is shortened. As a result, the voltage of the coil NS1 decreases. For this reason, it also has a function of stabilizing the voltage on the 13 volt line side via the circuit on the 5 volt line side (see, for example, Patent Document 1).

However, this peak cut circuit 81 is connected to the 13 volt line, and when the load connected to the 13 volt line is light, the voltage of this line is maintained high, so that the bypass current is always the peak cut circuit. 81 will flow. For this reason, for example, when this power source is used for an air conditioner or the like, a wasteful bypass current continues to flow in a so-called standby state in which air conditioning operation is not performed, and improvement has been demanded from the viewpoint of energy saving. .
JP-A-4-251563 (page 2-3, FIG. 1)

  The present invention solves the above-described problems, and an object thereof is to suppress a bypass current when the electronic device is in a standby state.

In order to solve the above-mentioned problems, the present invention provides a transformer having a primary side winding and a high side winding and a low side winding on the secondary side, and a DC voltage applied to the primary side winding of the transformer. A switching element for switching, a rectifying element for rectifying the voltages of the high-voltage side winding and the low-voltage side winding to direct current and outputting a high-voltage direct-current voltage and a low-voltage direct-current voltage, and stabilizing the low-voltage direct-current voltage Provided between the feedback circuit for controlling the switching, the output line on the high-voltage DC voltage side and the output line on the low-voltage DC voltage side, and when the output line on the high-voltage DC voltage side becomes a predetermined voltage or higher A peak cut circuit that bypasses current to the output line on the low-voltage DC voltage side;
A switching power supply comprising a peak cut control circuit for turning on / off the function of the peak cut circuit in response to an input peak cut control signal;
A control unit that outputs the peak cut control signal to the peak cut control circuit corresponding to a control state of a load connected to the output line on the high-voltage DC voltage side,
The control unit is an electronic device that transitions between a standby state in which a load on the output line on the high-voltage DC voltage side is disconnected and an operating state in which a load is connected to the output line on the high-voltage DC voltage side,
The control unit outputs the peak cut control signal for turning off the peak cut function to the peak cut control circuit in the standby state, and provides the peak cut function to the peak cut control circuit in the operation state. The peak cut control signal that is turned on is output .

Or a transformer having a primary side winding and a secondary side having a high voltage side winding and a low voltage side winding, a switching element for switching a DC voltage applied to the primary side winding of the transformer, and the high voltage side A rectifying element that rectifies the voltage of the winding and the low-voltage side winding to direct current, outputs a high-voltage direct-current voltage and a low-voltage direct-current voltage, and a feedback circuit that controls the switching so as to stabilize the low-voltage direct-current voltage; The output line on the low-voltage DC voltage side is provided between the output line on the high-voltage DC voltage side and the output line on the low-voltage DC voltage side, and when the output line on the high-voltage DC voltage side becomes a predetermined voltage or higher, A peak cut circuit that bypasses the current to
A switching power supply formed by providing a peak cut control circuit for turning on / off the function of the peak-cut circuits corresponding to the peak cut control signal input,
A control unit that outputs the peak cut control signal to the peak cut control circuit corresponding to a control state of a load connected to the output line on the high-voltage DC voltage side,
The control unit is an electronic device that transitions between a standby state in which a load on the output line on the high-voltage DC voltage side is disconnected and an operating state in which a load is connected to the output line on the high-voltage DC voltage side,
When the control unit makes a transition from the standby state to the operation state, the peak cut control signal that connects a load to the output line on the high-voltage DC voltage side and then turns on the peak cut function to the peak cut control circuit Is output.

  In addition, the control unit outputs the peak cut control signal for turning off the peak cut function to the peak cut control circuit when the transition from the operation state to the standby state is performed, and then the output line on the high-voltage DC voltage side Disconnect the load.

By using the above means, according to the electronic equipment provided with the switching power supply according to the present invention,
In the invention according to claim 1 , since the power supply provided with the peak cut control circuit is provided in the electronic device, the peak cut circuit is provided when the electronic device is in a standby state, that is, when the output line on the high voltage DC voltage side is unloaded. Can reduce wasteful current consumption.

According to the second aspect of the present invention, when a power source including a peak cut control circuit is provided in an electronic device and a transition is made from a standby state to an operating state, that is, when a load is connected to the output line on the high-voltage DC voltage side, Since the peak cut circuit is turned on after the voltage of the output line on the voltage side is once lowered, fluctuations in the output line voltage on the low voltage direct current voltage side due to the bypass current from the peak cut circuit can be reduced.

In the invention according to claim 3 , when the operation state is changed to the standby state, that is, when the load is disconnected from the output line on the high voltage DC voltage side, the peak cut circuit is turned off, and then the output line on the high voltage DC voltage side Therefore, fluctuations in the output line voltage on the low-voltage DC voltage side due to the bypass current from the peak cut circuit can be reduced.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings. The same parts as those described in the background art are given the same numbers, and detailed description thereof is omitted.

  FIG. 1 is a circuit diagram showing a switching power supply according to the present invention. This power supply unit 10 transforms the bridge diode R that rectifies the commercial power supply E, the switching element Q1 that switches the rectified DC voltage via the primary side coil NP, and the voltage that is switched by the coil NP. A transformer T that outputs to the secondary coils NS1 and NS2, a diode D1 that rectifies the AC voltage output from the secondary coil NS1 into a DC voltage of 13 volts, and an AC voltage that is output from the secondary coil NS2. A diode D2 that rectifies to a DC voltage of 5 volts and a feedback circuit 80 that monitors the DC voltage of 5 volts and performs switching control of the switching element Q1 so as to always maintain this voltage are provided.

  Further, a smoothing capacitor C1 is provided in parallel with the output of the bridge diode R, and smoothing capacitors C2 and C3 are provided on the output side of the diodes D1 and D2, respectively. Further, a peak cut circuit 3 is provided between the output side of the 13 volt line and the output side of the 5 volt line.

  A peak cut control unit 1 that controls the function of the peak cut circuit 3 is connected to the peak cut circuit 3. The peak cut control unit 1 is configured to turn on / off the function of the peak cut circuit 3 in accordance with an instruction from the control unit 2 constituted by a microcomputer or the like. The control unit 2 controls an electronic device equipped with the power supply unit 10, for example, an air conditioner, and does not constitute the power supply unit 10. The 13-volt line is on the high-voltage DC voltage side with respect to the 5-volt line, and conversely, the 5-volt line is on the low-voltage DC voltage side with respect to the 13-volt line.

  The peak cut circuit 3 is composed of a constant voltage diode DZ. The cathode terminal is connected to the 13 volt line, and the anode terminal is connected to the peak cut control unit 1. The anode terminal is controlled to be connected / not connected to the 5-volt line (on / off of the peak cut function) by the operation of the peak cut control unit 1. Therefore, the peak cut function works only when this anode terminal is connected to the 5-volt line.

  In the peak cut control unit 1, the anode terminal of the constant voltage diode DZ is connected to the emitter of the PNP transistor Q2, and the collector of the transistor Q2 is connected to the 5 volt line. The base of the transistor Q2 is connected to the other end of the resistor R1 whose one end is connected to the 13 volt line, and the other end of the resistor R1 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to the collector of an NPN transistor Q3, and the emitter of the transistor Q3 is connected to the 0 volt line.

  The control unit 2 outputs a peak cut control signal to the base of the transistor Q3. When this peak cut control signal is on, that is, when the base current of the transistor Q3 flows, the transistor Q3 and the transistor Q2 Are turned on, and the peak cut function by the constant voltage diode DZ is turned on. On the other hand, when the peak cut control signal is off, that is, when the base current of the transistor Q3 does not flow, the transistors Q3 and Q2 are turned off, and the peak cut function by the constant voltage diode DZ is turned off.

  When there is no load connected to the 13 volt line, that is, when the connected load does not consume current, the control unit 2 turns off the peak cut control signal and blocks the bypass current of the peak cut circuit 3. Control. In addition, when there is a load connected to the 13 volt line, that is, when the connected load consumes current, the control unit 2 turns on the peak cut control signal so that the 13 volt line exceeds the predetermined voltage. It functions so as not to become.

  In this way, the peak cut control circuit that turns on / off the function of the peak cut circuit is provided, so that the function of the peak cut circuit can be turned off when the output line on the high-voltage DC voltage side is unloaded. Unnecessary current consumption in the circuit can be reduced.

  FIG. 4 is a control system block diagram of an electronic apparatus provided with the power supply unit 10 described in FIG. 1, here, an air conditioner. In addition, in order to simplify description, illustration and description are abbreviate | omitted about parts which are not directly related to this invention, such as the fan motor and refrigerant circuit with which the air conditioner was equipped. The control system of the air conditioner uses another voltage, for example, a voltage such as 15 volts, as a power source, and this is also omitted here.

  4 is connected to a power supply unit 10 connected to a commercial power supply (not shown), a reset circuit 4 connected to a 5-volt line of the power supply unit 10, a control unit 2, and a 13-volt line of the power supply unit 10. And a drive circuit 5 for driving the stepping motor 6.

  The 0 volt line of the power supply unit 10 is connected to the ground (earth), the reset signal line is connected from the reset circuit 4 to the control unit 2, the drive signal line is connected from the control unit 2 to the drive circuit 5, A control signal line is connected from the control unit 2 to the peak cut control unit 1 inside the power supply unit 10.

  The reset circuit 4 monitors the voltage of the 5-volt line of the power supply unit 10 and outputs a signal for resetting the control unit 2 when this voltage becomes 4.2 volts or less. On the other hand, the stepping motor 6 includes a plurality of phase coils, and the rotating shaft provided in the stepping motor 6 rotates in response to the pulsed drive signal output from the control unit 2 for each phase.

  Further, the stepping motor 6 is configured to fix and hold the rotation angle of the rotating shaft by applying a voltage to a plurality of coils at a predetermined phase. This state is maintained unless there is an instruction. Further, when the air conditioner is in a standby state, that is, when power-off is instructed by a remote controller (not shown), the control unit 2 turns off the drive circuit 5 (the internal transistor is cut off) in order to reduce current consumption. The drive signal is output as follows. As a result, the stepping motor 6 is connected to the 13 volt line of the power supply unit 10, but no current flows.

  As described above, since the 13 volt line basically does not include a voltage stabilizing circuit, the peak cut circuit 3 is used to suppress the voltage rise when the load on the 13 volt line becomes light. Therefore, when the air conditioner enters the standby state, the current in the peak cut circuit 3 increases because the air conditioner is completely unloaded. For this reason, when the air conditioner enters a standby state, the control unit 2 instructs the peak cut control unit 1 to turn off the peak cut circuit 3. Further, when the air conditioner returns from the standby state to the normal operation state, the control unit 2 instructs the peak cut control unit 1 to turn on the peak cut circuit 3. This control procedure will be described in detail later as control method 2.

  Thus, when the power supply unit according to the present invention is mounted on an electronic device, for example, an air conditioner, and the electronic device is in a state in which almost no current flows through a load connected to the power supply unit, for example, in a standby state, It is possible to cut off the bypass current of the peak cut circuit 3 so that useless standby power is not consumed.

  If the configuration and control as described above are used, useless power consumption during standby can be reduced when the load fluctuation in the air conditioner equipped with the power supply unit 10 is small. However, when the load fluctuation is large, simple control of the peak cut circuit 3 may not be successful. Next, an example in which the load variation connected to the power supply unit 10 is large will be described.

  FIG. 2 is a time chart relating to the power source when the air conditioner of FIG. 4 is controlled. FIG. 2A is a stepping motor 6 connected as a voltage of 13 volt line and B) as a load of 13 volt line. , C) shows the voltage of the 5 volt line, and D) shows the state of the peak cut circuit 3 according to the instruction of the control unit 2. Note that the vertical dotted line indicates the state of the air conditioner in which the air conditioner (not shown) transitions according to the power-on signal from the remote controller, and indicates the timing at which the standby state and the operating state transition.

  In the standby state, the operation of the air conditioner is stopped, and the receiving circuit and control circuit of the remote controller (not shown) are operating. Is not supplied. Therefore, the current supplied from the 5 volt line is small, and the voltage of the 13 volt line is increased to 16.4 volts because there is no load. The peak cut circuit 3 is also turned off by an instruction from the control unit 2 in order to save standby power. The peak cut circuit 3 cuts a voltage of 13.2 volts or more.

  Here, when a power-on signal is received from the remote controller, the controller 2 of the air conditioner shifts from the standby state to the operation state, turns on the peak cut function, and initializes the operation of the air conditioner (approximately 0.6 seconds). ), A drive signal is output to a stepping motor 6 that drives a horizontal wind direction plate (not shown). Note that this drive signal is a signal for maintaining the rotation axis angle of the stepping motor 6 as described above.

  When the peak cut function is turned on, the control unit 2 is still in the process of initialization, and the drive signal of the stepping motor 6 remains off. Therefore, 16.4 volts is applied to the peak cut circuit 3, and a current flows through the constant voltage diode DZ of the peak cut circuit 3 so that the specified value of the peak cut circuit 3 is 13.2 volts. .

  This current flows through the transistor Q2 into the 5 volt line and the voltage on this line rises temporarily. When the voltage of this line rises, the ON time of the switching element Q1 is narrowed via the feedback circuit 80, that is, the potential of the 5 volt line is lowered, and as a result, the voltage of the 5 volt line is lowered. At this time, if the current flowing through the constant voltage diode DZ is large, the voltage of the 5 volt line further decreases correspondingly.

  For this reason, the voltage of the 5 volt line, which should normally be stabilized in the vicinity of 5 volts, falls below 5 volts and temporarily drops below 4 volts. Therefore, the reset circuit connected to the 5-volt line outputs a reset signal to the control unit 2, and the entire air conditioner is initialized.

  For this reason, since the reset operation is performed at a timing when the reset is not originally performed, the operation of the air conditioner becomes an abnormal operation. Further, even when viewed as a power source, the voltage of the 5 volt line changes greatly, which causes a problem in performance.

  Next, the control method 1 that eliminates the above-described problems will be described. Only the control timing is changed using the circuit of FIG.

  FIG. 3 is a time chart when the power source of FIG. 1 is mounted on an air conditioner and the control according to the present invention is performed. FIG. 3A is a voltage of 13 volt line, and B) is a load of 13 volt line. , C) shows the voltage of the 5-volt line, and D) shows the state of the peak cut circuit 3 according to the instruction of the control unit 2.

  In addition, in the case of this control method, in addition to the standby state and the operation state described above, the operation preparation state for shifting from the standby state to the operation state and the standby preparation state for shifting from the operation state to the standby state are implemented. It is supposed to be.

  In the standby state, the operation of the air conditioner is stopped as described with reference to FIG. 2, the remote control receiving circuit and a part of the control circuit are operating, and parts having a large driving current such as a stepping motor and a solenoid Is not supplied with power. Therefore, the current supplied from the 5 volt line is small, and the voltage of the 13 volt line is increased to 16.4 volts because there is no load. The peak cut circuit 3 is also turned off by an instruction from the control unit 2 in order to save standby power.

  In the operation preparation state, the peak cut circuit 3 is kept off, and a load, here a stepping motor, connected to a 13 volt line which is an unstabilized power source provided with the peak cut circuit 3 is driven. For this reason, the voltage of the 13 volt line to which the load is connected decreases from 16.4 volts, which was in the no-load state, to 13.2 volts.

  The voltage of the 13 volt line drops from 16.4 volts to 13.2 volts, and the peak cut circuit 3 is turned on when this voltage becomes stable. At this time, since the voltage of the 13 volt line is 13.2 volts, almost no current flows through the constant voltage diode DZ. For this reason, the current flowing from the constant voltage diode DZ to the 5 volt line is small, and the voltage of the 5 volt line is not pushed up. Therefore, the voltage drop of the 5-volt line through the feedback circuit which is the problem described above is not caused.

  When shifting from the operation state to the standby state, a standby preparation state is provided, and the stepping motor and the peak cut circuit are controlled in the reverse order of the operation preparation state. That is, the peak cut circuit is turned off while the stepping motor is driven (held), and then the stepping motor is turned off.

  In this way, when there is no load on the high-voltage DC voltage line (13 volt line), the peak cut circuit provided in this line is turned off to reduce the standby power consumption of the equipment using this line. Then, an operation preparation period is provided while the electronic device shifts from the standby state to the operation state. During this period, a load is connected to the high-voltage DC voltage line, and then the peak cut circuit is turned on. As a result, voltage fluctuations during the transition period can be reduced, and standby power consumption can be reduced.

  Next, the operation related to the peak cut circuit control of the control unit 2 will be described with reference to FIG.

  FIG. 5 is a flowchart of the control unit, where ST represents a step, the number following this represents a step number, Y represents Yes, and N represents No. FIG. 5A shows the control method 1 (described with reference to FIG. 3), and FIG. 5B shows the control method 2 (described with reference to FIG. 2).

  In the control method 1 of FIG. 5A, the control unit 2 starts operation when the power supply unit is connected to the commercial power supply, and first initializes the electronic device, here, the entire air conditioner (ST1). . Next, the function of the peak cut circuit 3 is turned off via the peak cut control unit 1 (ST2). Then, the drive of the stepping motor 6 is turned off by separating the winding of the stepping motor 6 from the ground via the drive circuit 5 (ST3).

  Next, it waits to receive a power-on signal from a remote controller (not shown). That is, the operation start instruction is confirmed (ST4), and if there is no instruction (ST4-N), the process jumps to ST4.

  When there is an instruction to start operation (ST4-Y), initialization relating to operation such as giving an instruction to an outdoor unit (not shown) is performed (ST5). Then, the driving of the stepping motor 6 is turned on (ST6), that is, the winding of the stepping motor 6 is connected to the ground via the drive circuit 5, and the rotating shaft of the stepping motor 6 is held.

  Then, it is confirmed whether a predetermined time, for example, 0.6 seconds has elapsed (ST7). This is the time when the stepping motor 6 is reliably held. That is, this is the time until the load is reliably connected to the 13 volt line and the voltage of the 13 volt line drops from 16.4 volts to about 13.2 volts. If the predetermined time has not elapsed (ST7-N), the process jumps to ST7.

  When the predetermined time has elapsed (ST7-Y), the function of the peak cut circuit 3 is turned on via the peak cut control unit 1 (ST8). Then, normal operation, that is, cooling and heating control is performed (ST9). If a power-off signal is received from the remote controller during normal operation, that is, if there is an instruction to stop operation (ST10), the process jumps to ST2. If there is no operation stop instruction (ST10-N), the process jumps to ST9.

  As described above, when a power supply having a peak cut control circuit is provided in an electronic device and a transition is made from a standby state to an operation state, the voltage of the output line on the high-voltage DC voltage side is once lowered and then the peak cut circuit is set. Since it is turned on, fluctuations in the output line voltage on the low-voltage DC voltage side due to the bypass current from the peak cut circuit can be reduced. At the same time, useless bypass current during standby can be reduced.

  Also, when switching from the operating state to the standby state, the output line on the high-voltage DC voltage side is unloaded after the peak cut circuit is turned off, so the output line on the low-voltage DC voltage side due to the bypass current from the peak cut circuit Voltage fluctuation can be reduced.

  Next, the control method 2 will be described with reference to FIG.

  When the power supply unit is connected to a commercial power supply, the control unit 2 starts its operation, and first initializes the electronic device, here, the entire air conditioner (ST11). Next, the function of the peak cut circuit 3 is turned off via the peak cut control unit 1. At the same time, the stepping motor 6 is turned off by disconnecting the winding of the stepping motor 6 from the ground via the drive circuit 5 (ST12).

  Next, it waits to receive a power-on signal from a remote controller (not shown). That is, the operation start instruction is confirmed (ST13), and if there is no instruction (ST13-N), the process jumps to ST13.

  When there is an instruction to start operation (ST13-Y), the function of the peak cut circuit 3 is turned on via the peak cut control unit 1 (ST14). Next, initialization relating to operation such as giving an instruction to an outdoor unit (not shown) is performed (ST15). Then, the driving of the stepping motor 6 is turned on (ST16), that is, the winding of the stepping motor 6 is connected to the ground via the drive circuit 5, and the rotating shaft of the stepping motor 6 is held.

  Then, normal operation, that is, cooling and heating are controlled (ST17). If a power-off signal is received from the remote controller during normal operation, that is, if there is an instruction to stop running (ST18-Y), the process jumps to ST12. If there is no operation stop instruction (ST18-N), the process jumps to ST17.

  In this way, the electronic device, here the air conditioner is provided with a power supply equipped with a peak cut control circuit, and the electronic device is in a standby state because the peak cut function is turned off (stopped) while the electronic device is in a standby state. In this case, useless current consumption in the peak cut circuit can be reduced. Further, since the load control of the 13 volt line is not performed, the control is simple and it can be widely applied to various electronic devices.

  In the embodiment described above, the secondary output voltage of the power supply unit is described as 5 volts or 13 volts. However, the present invention is not limited to this, and the same effect can be obtained with other voltages. Moreover, although the load of 13 volt line is described as a stepping motor, the load is not limited to a stepping motor as long as the load uses this power source.

  Further, the example in which the secondary output voltage of the power supply unit is two types has been described, but the same effect can be obtained if it is a multi-output type switching power source capable of extracting two or more types of voltages.

It is a circuit diagram which shows the Example of the switching power supply by this invention. It is a time chart explaining control of the air conditioner carrying the switching power supply by this invention. It is a time chart explaining other control of the air conditioner carrying the switching power supply by this invention. It is a block diagram explaining the control system of the air conditioner carrying the switching power supply by this invention. It is a flowchart explaining control of the air conditioner carrying the switching power supply by this invention, (A) shows the control method 1, (B) has shown the control method 2, respectively. It is a circuit diagram which shows the conventional switching power supply.

DESCRIPTION OF SYMBOLS 1 Peak cut control part 2 Control part 3 Peak cut circuit 4 Reset circuit 5 Drive circuit 6 Stepping motor 10 Power supply part 80 Feedback circuit 82, 83, 84 Terminal E Commercial power supply R Bridge diode C1, C2, C3 Smoothing capacitor D1, D2, D3 Diode Q1 Switching element Q2, Q3 Transistor R1, R2 Resistance NP, NS1, NS2 Coil

Claims (3)

A transformer having a primary side winding and a secondary side having a high voltage side winding and a low voltage side winding; a switching element for switching a DC voltage applied to the primary side winding of the transformer; and the high voltage side winding And a rectifying element that rectifies the voltages of the low-voltage side windings to DC and outputs a high-voltage DC voltage and a low-voltage DC voltage, a feedback circuit that controls the switching so as to stabilize the low-voltage DC voltage, and the high-voltage Provided between the output line on the DC voltage side and the output line on the low voltage DC voltage side, and when the output line on the high voltage DC voltage side becomes equal to or higher than a predetermined voltage, a current is supplied to the output line on the low voltage DC voltage side a peak cut circuit for bypassing the comprising in response to the peak-cut control signal input provided a peak cut control circuit for turning on / off the function of the peak-cut circuit switch And grayed power,
A control unit that outputs the peak cut control signal to the peak cut control circuit corresponding to a control state of a load connected to the output line on the high-voltage DC voltage side,
The control unit is an electronic device that transitions between a standby state in which a load on the output line on the high-voltage DC voltage side is disconnected and an operating state in which a load is connected to the output line on the high-voltage DC voltage side,
The control unit outputs the peak cut control signal for turning off the peak cut function to the peak cut control circuit in the standby state, and provides the peak cut function to the peak cut control circuit in the operation state. An electronic apparatus characterized by outputting the peak cut control signal to be turned on . A transformer having a primary side winding and a secondary side having a high voltage side winding and a low voltage side winding; a switching element for switching a DC voltage applied to the primary side winding of the transformer; and the high voltage side winding And a rectifying element that rectifies the voltages of the low-voltage side windings to DC and outputs a high-voltage DC voltage and a low-voltage DC voltage, a feedback circuit that controls the switching so as to stabilize the low-voltage DC voltage, and the high-voltage Provided between the output line on the DC voltage side and the output line on the low voltage DC voltage side, and when the output line on the high voltage DC voltage side becomes equal to or higher than a predetermined voltage, a current is supplied to the output line on the low voltage DC voltage side a peak cut circuit for bypassing the comprising in response to the peak-cut control signal input provided a peak cut control circuit for turning on / off the function of the peak-cut circuit switch And grayed power,
A control unit that outputs the peak cut control signal to the peak cut control circuit corresponding to a control state of a load connected to the output line on the high-voltage DC voltage side,
The control unit is an electronic device that transitions between a standby state in which a load on the output line on the high-voltage DC voltage side is disconnected and an operating state in which a load is connected to the output line on the high-voltage DC voltage side,
When the control unit makes a transition from the standby state to the operation state, the peak cut control signal that connects a load to the output line on the high-voltage DC voltage side and then turns on the peak cut function to the peak cut control circuit An electronic device characterized by being output. The control unit outputs the peak cut control signal for turning off the peak cut function to the peak cut control circuit when transitioning from the operating state to the standby state, and then loads the output line on the high-voltage DC voltage side The electronic device according to claim 2 , wherein the electronic device is cut.

Images