WO2016194197A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

Info

Publication number
WO2016194197A1
WO2016194197A1 PCT/JP2015/066203 JP2015066203W WO2016194197A1 WO 2016194197 A1 WO2016194197 A1 WO 2016194197A1 JP 2015066203 W JP2015066203 W JP 2015066203W WO 2016194197 A1 WO2016194197 A1 WO 2016194197A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
overvoltage
circuit
state
capacitor
Prior art date
Application number
PCT/JP2015/066203
Other languages
English (en)
Japanese (ja)
Inventor
秀敏 山川
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2015/066203 priority Critical patent/WO2016194197A1/fr
Priority to JP2017521448A priority patent/JP6265304B2/ja
Publication of WO2016194197A1 publication Critical patent/WO2016194197A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only

Definitions

  • the present invention relates to a power conversion device that is mounted on home appliances such as an air conditioner and performs a converter operation for converting AC power into DC power, and more particularly to a power conversion device including an overvoltage protection circuit.
  • an overvoltage protection circuit for home appliances such as an air conditioner
  • a 200V power supply is accidentally applied to a 100V power supply home appliance
  • the voltage of the smoothing capacitor that smoothes the DC power obtained by rectifying the AC power is detected by the voltage detection circuit, and when the overvoltage state of the smoothing capacitor is detected, the relay switch is switched to switch the load side
  • the light-emitting element or buzzer is used to notify the user of the home appliance with light or sound of the overvoltage state of the power supply.
  • an overvoltage protection circuit for an engine control unit (ECU) of a vehicle, there is one that actively eliminates an overvoltage state when an overvoltage of an electrolytic capacitor that holds a power supply voltage is detected (for example, Patent Documents). 2).
  • this overvoltage protection circuit there is provided a discharging means for monitoring the charging voltage of the electrolytic capacitor charged by the booster circuit by a microcomputer and discharging the electric charge of the electrolytic capacitor when the charging voltage of the electrolytic capacitor exceeds a predetermined withstand voltage.
  • the overvoltage state is positively resolved.
  • the overvoltage protection circuit described in Patent Document 1 has a function of notifying a user of home appliances of an overvoltage state when an overvoltage is detected, and a function of cutting off the DC power supply to the load side.
  • An overvoltage is continuously applied to a circuit such as a rectifier circuit or a voltage detection circuit. For this reason, depending on the withstand voltage characteristics of the circuit components on the power supply side from the relay switch, there is a possibility that component destruction or component failure occurs.
  • the overvoltage protection circuit described in Patent Document 2 is provided with a discharging means for discharging the electric charge of the electrolytic capacitor when an overvoltage is detected, the overvoltage state occurs due to a failure of the booster circuit, and the charge amount from the booster circuit is discharged. If the state where the discharge charge amount by the means continues is continued, the overvoltage state is not eliminated even if the discharge means operates, and there is a possibility that circuit components such as an electrolytic capacitor will break down.
  • the present invention has been made to solve the above-described problems, and a first object of the present invention is to detect an overvoltage state of a smoothing capacitor that smoothes DC power obtained by converting AC power.
  • An object of the present invention is to obtain a power converter capable of protecting a smoothing capacitor and other circuit components from a withstand voltage failure even when an overvoltage state occurs due to a failure of a booster circuit.
  • the 2nd objective of this invention is obtaining household appliances, such as an air conditioner provided with the power converter device which has an overvoltage protection function.
  • a power converter includes a first rectifier circuit that rectifies an AC voltage of an AC power supply and outputs a DC voltage, and converts a DC voltage output of the first rectifier circuit to output a converted DC voltage.
  • a converter main circuit a main circuit capacitor for smoothing a DC voltage output of the converter main circuit, a first opening / closing means provided in an AC voltage path between the AC power source and the first rectifier circuit, A second switching means and a backflow prevention diode connected in series between the AC power supply side terminal of the first switching means and the positive terminal of the main circuit capacitor; and a capacitor, which rectifies the AC voltage of the AC power supply.
  • a second rectifier circuit that outputs a DC voltage; an overvoltage detection circuit that detects an overvoltage state based on the DC voltage output from the second rectifier circuit; and the adjustment circuit that detects the overvoltage state when the overvoltage detection circuit detects the overvoltage state.
  • a discharge circuit for discharging a charge of a capacitor of the circuit; and a control means for controlling the first opening and closing means and the second opening and closing means based on an overvoltage state detected by the overvoltage detection circuit, the control means comprising: When the overvoltage state continues for a predetermined time or more, the first opening / closing means and the second opening / closing means in the closed state are opened.
  • the power conversion device of the present invention includes the discharge circuit for discharging the electric charge of the capacitor of the rectifier circuit and the control means for controlling the first open / close means and the second open / close means,
  • the voltage can be suppressed to a voltage level that does not exceed the component breakdown voltage, and circuit components including the converter main circuit can be protected from component failure due to overvoltage.
  • the figure which shows the electric current path (when the power supply voltage phase is positive) when the operation mode is the startup (1) mode The figure which shows the electric current path (when the power supply voltage phase is negative) when the operation mode is the startup (1) mode
  • the figure which shows the electric current path (the case where the power supply voltage phase is positive) when the operation mode is the reactive power reduction mode Diagram showing the operation of the overvoltage protection circuit (when the microcomputer did not detect the overvoltage continuation state) Partial diagram showing the operation of the overvoltage protection circuit (when the microcomputer did not detect the overvoltage continuation state)
  • Microcomputer control operation flow chart The figure which shows the electric current path
  • FIG. 1 shows a system configuration including an air conditioner equipped with the power conversion device of the present embodiment.
  • the components normally provided in the air conditioner such as a heat exchanger and a refrigerant pipe are omitted as appropriate.
  • This system is provided on an outdoor unit 1 and an indoor unit 2 of an air conditioner, an AC power source (AC) 3 that supplies AC power to the outdoor unit 1, and a power line that connects the AC power source 3 and the outdoor unit 1. And a breaker (BR) 4.
  • AC AC power source
  • BR breaker
  • a power supply line from the AC power supply 3 is connected to the power supply side terminals of the noise filter 5 and the noise filter 6 via the breaker 4.
  • the indoor unit 2 is connected to the load side terminal of the noise filter 6.
  • the AC power of the AC power supply 3 is supplied to the indoor unit 2 via the noise filter 6 of the outdoor unit 1, and the converter main unit (described later) inside the outdoor unit 1 is connected via the noise filter 5. It is also supplied to a power converter including a circuit and an inverter main circuit.
  • One end of a load side terminal of the noise filter 5 is connected to one end of a relay (RL) 7 as a first opening / closing means, and noise is connected between the other end of the relay 7 and the other end of the load side terminal of the noise filter 5.
  • a removal capacitor 8 is connected. Both ends of the capacitor 8 are connected to a power supply side terminal of a full-wave rectifier circuit (DB) 9 constituted by a diode bridge as a first rectifier circuit.
  • the full-wave rectifier circuit 9 rectifies the AC voltage supplied from the AC power supply 3 and outputs a DC voltage. Since the relay 7 is provided in the AC voltage path between the AC power source 3 and the full-wave rectifier circuit 9, the supply of the AC voltage from the AC power source 3 to the full-wave rectifier circuit 9 is cut off by opening the relay 7. Can do.
  • the converter main circuit 10 is connected to the load side terminal of the full-wave rectifier circuit 9.
  • the converter main circuit 10 converts the DC voltage output of the full-wave rectifier circuit 9 and outputs the converted DC voltage.
  • PFC power factor correction
  • a converter main circuit 10 which is a power factor correction (PFC) converter includes reactors 11a and 11b, switching elements 12a and 12b such as MOSFETs (electrolytic effect transistors), backflow prevention diodes 13a and 13b, and a shunt for current detection. It comprises resistors 14a and 14b. Then, using a converter control microcomputer (not shown), the switching elements 12a and 12b are set so that a phase difference occurs in the current flowing through the reactors 11a and 11b based on information such as current values detected by the shunt resistors 14a and 14b. By controlling, a boosted voltage can be obtained as the converter output.
  • PFC power factor correction
  • a main circuit capacitor 15 is provided on the output side of the converter main circuit 10, and the main circuit capacitor 15 is charged by the converter output voltage, whereby a smoothed DC voltage is generated between the terminals of the main circuit capacitor 15.
  • An electrolytic capacitor is suitable as the main circuit capacitor 15.
  • PTC Positive Temperature Coefficient
  • RL relay
  • the other end of the relay 17 is connected to the anode of the backflow prevention diode 18, and the cathode of the backflow prevention diode 18 is connected to the positive terminal of the main circuit capacitor 15.
  • the PTC thermistor 16, the relay 17, and the backflow prevention diode 18 are connected in series between the AC power supply side terminal of the relay 7 and the positive terminal of the main circuit capacitor 15, thereby providing a bypass charging path to the main circuit capacitor 15. It is formed.
  • the PTC thermistor 16 By providing the PTC thermistor 16 in this bypass charging path, the inrush current when charging the main circuit capacitor 15 can be suppressed.
  • a normal resistance element may be used instead of the PTC thermistor 16 according to the device characteristics of circuit components such as the main circuit capacitor 15.
  • An inverter main circuit 19 is connected between terminals of the main circuit capacitor 15, and a compressor motor 20 mounted on the outdoor unit 1 is connected to the inverter main circuit 19.
  • a brushless DC motor is applied to the motor 20.
  • the inverter main circuit 19 rotates the motor 20 by turning on and off the switching elements in the inverter main circuit 19 using an inverter control microcomputer (not shown).
  • the inverter main circuit 19 may be constituted by an IPM (Intelligent Power Module).
  • One end of another PTC thermistor 21 is connected to the AC power supply side terminal of the relay 7, and the anode of the diode 22 and the cathode of the diode 23 are connected to the other end of the PTC thermistor 21.
  • the positive terminal of the smoothing capacitor 24 is connected to the cathode of the diode 22, and the negative terminal of the smoothing capacitor 24 is connected to the anode of the diode 23.
  • a diode 22, a diode 23, and a smoothing capacitor 24 constitute a second rectifier circuit that rectifies the AC voltage of the AC power supply 3 and outputs a DC voltage.
  • an electrolytic capacitor is suitable. Further, as will be described later, since the voltage of the smoothing capacitor 24 is used when the outdoor unit 1 is started, the capacity of the smoothing capacitor 24 may be smaller than that of the main circuit capacitor 15.
  • the DC / DC converter 25 is connected in parallel to the smoothing capacitor 24 and inputs a voltage between terminals of the smoothing capacitor 24 to generate various DC voltages (VCC) used in circuit elements in the outdoor unit 1 such as the microcomputer 26.
  • the microcomputer 26 is a microcomputer that controls the overall control of the outdoor unit 1, and it is necessary for the microcomputer 26 to operate in order to start and operate the outdoor unit 1.
  • the inter-terminal voltage of the main circuit capacitor 15 is also input to the DC / DC converter 25 via the diode 27 and the diode 28.
  • a DC / DC converter 25 having an input voltage range that can correspond to both the voltage between the terminals of the main circuit capacitor 15 and the voltage between the terminals of the smoothing capacitor 24 is used.
  • the diodes 27 and 28 also have a role of blocking direct current from the smoothing capacitor 24 toward the main circuit capacitor 15.
  • the output voltage detection unit 40 detects the voltage across the terminals of the main circuit capacitor 15, and outputs the detected voltage value to the input port (IN-1) of the microcomputer 26 as a converter output voltage value.
  • the overvoltage protection circuit 41 includes an overvoltage detection circuit 41 a that detects an overvoltage state based on the voltage across the smoothing capacitor 24, and a discharge circuit 41 b that discharges the electric charge of the smoothing capacitor 24.
  • an overvoltage detection circuit 41 a that detects an overvoltage state based on the voltage across the smoothing capacitor 24, and a discharge circuit 41 b that discharges the electric charge of the smoothing capacitor 24.
  • the resistors 29 and 30 are connected in series between the positive terminal of the smoothing capacitor 24 and the ground (GND). As a result, the resistors 29 and 30 divide the voltage between the terminals of the smoothing capacitor 24 to generate the detection voltage Vdet.
  • the switching element 32 for detecting an overvoltage state (here, a transistor is used as an example) has a base connected to the interconnection point of the resistors 29 and 30, and a constant voltage diode 31 connected between the emitter and the ground.
  • the reference voltage (breakdown voltage) of the constant voltage diode 31 is Vz.
  • the base-emitter voltage of the switching element 32 which is a transistor, is Vbe.
  • the switching element 32 is turned on when the detection voltage Vdet becomes larger than the sum (Vz + Vbe) of the reference voltage Vz and the emitter-base voltage Vbe, and the detection voltage Vdet is the sum of the reference voltage Vz and the emitter-base voltage Vbe. When it becomes smaller than (Vz + Vbe), it is turned off.
  • Resistors 33 and 34 are connected in series between the positive terminal of the smoothing capacitor 24 and the collector of the switching element 32.
  • the photodiode of the photocoupler 35 is connected in parallel with the resistor 34.
  • the resistors 33 and 34 limit the current flowing through the photodiode of the photocoupler 35.
  • One end of the resistor 36 is connected to a direct current power supply (VCC) generated by the DC / DC converter 25, and the other end of the resistor 36 is connected to the collector of the phototransistor of the photocoupler 35.
  • VCC direct current power supply
  • a capacitor 37 is connected between the collector and emitter of the phototransistor of the photocoupler 35, and the emitter of the phototransistor of the photocoupler 35 is grounded.
  • the resistor 36 limits the current flowing through the phototransistor of the photocoupler 35, and the capacitor 37 is for removing noise superimposed on the output of the photocoupler 35. Then, the collector terminal of the phototransistor of the photocoupler 35 is connected to the microcomputer 26.
  • the overvoltage detection circuit 41a is configured as described above, when the smoothing capacitor 24 is in an overvoltage state, the switching element 32 is turned on and the photocoupler 35 is turned on, whereby the photocoupler 35 is turned on to a low potential (GND potential). ) Is output to the input port (IN-2) of the microcomputer 26. On the other hand, when the smoothing capacitor 24 is not in an overvoltage state, the switching element 32 is turned off, the photocoupler 35 is turned off, and a high potential (VCC) is output from the photocoupler 35 to the microcomputer 26. In this way, the microcomputer 26 can grasp the overvoltage state of the smoothing capacitor 24.
  • VCC high potential
  • the microcomputer 26 controls the opening and closing of the relays 7 and 17 based on the grasp of the overvoltage state. The procedure for opening / closing the relays 7 and 17 will be described later. In addition, in order to describe the open / closed state of the breaker 4 and the relays 7 and 17, the open state will be expressed as OFF and the closed state will be expressed as ON.
  • the base of the discharge switching element 38 (here, a transistor is taken as an example) is connected to the collector of the switching element 32, and the collector of the switching element 38 is grounded.
  • a resistor 39 is connected between the positive terminal of the smoothing capacitor 24 and the emitter of the switching element 38.
  • the discharge circuit 41b is configured as described above, when the switching element 32 for detecting an overvoltage state is turned on (when an overvoltage state is detected), the switching element 38 is turned on, and the charge of the smoothing capacitor 24 is changed to the resistance 39. Discharged via. On the other hand, when not in an overvoltage state, since the switching element 32 is in an off state, the switching element 38 is turned off, and the charge of the smoothing capacitor 24 is not discharged.
  • FIG. 2 shows an operation timing chart when the outdoor unit 1 is started from a stopped state and shifts to the normal mode and the reactive power reduction mode. Details of each mode will be described later.
  • FIG. 3 shows a current path when the voltage phase of the AC power supply 3 is a positive half wave.
  • the potential on the breaker 4 side of the AC power supply 3 is higher than the potential on the side not connected to the breaker 4, the voltage phase of the AC power supply 3 is set to “positive”, and the potential on the breaker 4 side is connected to the breaker 4.
  • the voltage phase of the AC power supply 3 is defined as “negative” when the potential is lower than the non-side potential.
  • the AC power supply 3 ⁇ the noise filter 5 ⁇ the PTC thermistor 21 ⁇ the diode 22 ⁇ the smoothing capacitor 24 ⁇ the diode 28 ⁇ the full wave rectifier circuit 9 ⁇ the noise filter 5 ⁇ the AC power supply 3 A current flows through the path, and the smoothing capacitor 24 is charged.
  • the PTC thermistor 21 is provided to suppress an inrush current from the AC power supply 3 to the smoothing capacitor 24 when the outdoor unit 1 is started.
  • a DC voltage obtained by rectifying the AC power supply 3 is generated between the terminals of the smoothing capacitor 24.
  • the DC voltage is input to the DC / DC converter 25, and the DC / DC converter 25 generates a DC power source for the microcomputer 26, whereby the microcomputer 26 is activated.
  • the microcomputer 26 can manage and control the entire outdoor unit 1 by executing a program stored in advance in a storage element (not shown).
  • the microcomputer 26 confirms that the converter output voltage (the voltage across the terminals of the main circuit capacitor 15) is equal to or higher than a predetermined voltage threshold based on the detection value of the output voltage detector 40, and then turns the relay 7 on (FIG. 2: Activation (3)). Thereby, a charging path to the main circuit capacitor 15 via the full-wave rectifier circuit 9 and the converter main circuit 10 is formed.
  • the voltage threshold value of the converter output voltage described above may be set in consideration of the effect that this inrush current can be suppressed.
  • the converter output voltage which is the voltage between the terminals of the main circuit capacitor 15, is supplied to the inverter main circuit 19, and the inverter main circuit 19 rotates and drives the motor 20 using the converter output voltage as a power source. Is executed.
  • the overvoltage protection circuit 41 when the outdoor unit 1 is operating in the normal mode will be described.
  • the smoothing capacitor 24 is not in an overvoltage state.
  • the detection voltage Vdet obtained by dividing the voltage between the terminals of the smoothing capacitor 24 is equal to or less than the sum (Vz + Vbe) of the reference voltage Vz of the constant voltage diode 31 and the emitter-base voltage Vbe of the switching element 32, the switching element.
  • Reference numeral 32 denotes an off state, and the photocoupler 35 that transmits the overvoltage detection state to the microcomputer 26 becomes non-conductive. Since a high potential (VCC) is input to the input port of the microcomputer 26, the microcomputer 26 recognizes that the voltage between the terminals of the smoothing capacitor 24 is “normal state (not an overvoltage state)”.
  • the microcomputer 26 indicates that the voltage between the terminals of the smoothing capacitor 24 is “normal state (not overvoltage state)”.
  • the conditions for determination are (Expression 1), (Expression 2) to (Expression 3).
  • Vdet Vc ⁇ R30 / (R29 + R30)
  • Vdet Vc ⁇ R30 / (R29 + R30)
  • Vc Vc ⁇ R30 + 1 ⁇ (Vz + Vbe
  • the microcomputer 26 detects overvoltage based on the determination voltage threshold Vth1 of overvoltage detection defined by (Equation 4).
  • Vth1 (R29 / R30 + 1).
  • Vz + Vbe Therefore, the determination voltage threshold Vth1 is based on the resistance ratio R29 / R30 determined by the resistance values of the resistors 29 and 30, and the sum (Vz + Vbe) of the reference voltage Vz of the constant voltage diode 31 and the emitter-base voltage Vbe of the switching element 32. Determined.
  • the determination voltage threshold value Vth1 may be set so that the determination voltage threshold value Vth1 is smaller than the withstand voltage rating of the electronic components in use including the smoothing capacitor 24.
  • the microcomputer 26 recognizes that the inter-terminal voltage of the smoothing capacitor 24 is “normal state (not overvoltage state)”. At the same time, the discharge circuit does not operate and the charge of the smoothing capacitor 24 is not discharged. Further, the microcomputer 26 does not change the on / off states of the relay 7 and the relay 17.
  • the microcomputer 26 detects an overvoltage state based on the converter output voltage value detected by the output voltage detection unit 40. At this time, if the determination threshold value Vth2 for overvoltage detection based on the converter output voltage value is set to be smaller than the determination voltage threshold value Vth1 for overvoltage detection based on the signal from the overvoltage detection circuit 41a (that is, Vth2 ⁇ Vth1), the microcomputer 26 detects overvoltage. An overvoltage protection operation can be performed before the circuit detects the overvoltage. Accordingly, it is considered that there are few cases in which the overvoltage detection circuit 41a detects an overvoltage state when operating in the normal mode in practice, and therefore description of the circuit operation in such a case is omitted.
  • the reactive power reduction mode is to reduce the reactive current flowing through the capacitor 8 when the operation of the motor 20 in the normal mode is finished and the power supply to the converter main circuit 10 and the inverter main circuit 19 becomes unnecessary. This is an operation mode for reducing reactive power.
  • the transition to the reactive power reduction mode is performed by turning off the relay 7 under the control of the microcomputer 26 after a predetermined time has elapsed after the operation of the motor 20 in the normal mode is completed.
  • the relay 17 maintains an OFF state (FIG. 2: Reactive power reduction mode).
  • the terminal connected to the breaker 4 is defined as the first terminal of the capacitor 8 and the other terminal is defined as the second terminal of the capacitor 8.
  • the voltage between the terminals of the capacitor 8 is positive, and when the first terminal of the capacitor 8 is at a lower potential than the second terminal of the capacitor 8.
  • the voltage between terminals of the capacitor 8 is defined as negative polarity.
  • the first current path in which an overvoltage state occurs between the terminals of the smoothing capacitor 24 is invalid when a positive charge remains at the first terminal of the capacitor 8 and the voltage phase of the AC power supply 3 is negative. It is formed when shifting to the power reduction mode. Specifically, as shown in FIG. 5, AC power supply 3 ⁇ noise filter 5 ⁇ capacitor 8 ⁇ full wave rectifier circuit 9 ⁇ converter main circuit 10 ⁇ diode 27 ⁇ smoothing capacitor 24 ⁇ diode 23 ⁇ PTC thermistor 21 ⁇ noise filter 5 ⁇ Current flows through the path of the AC power source 3.
  • the second current path in which an overvoltage state occurs between the terminals of the smoothing capacitor 24 is invalid when negative charge remains in the first terminal of the capacitor 8 and the voltage phase of the AC power supply 3 is positive. It is formed when shifting to the power reduction mode. Specifically, as shown in FIG. 6, the AC power source 3 ⁇ the noise filter 5 ⁇ the PTC thermistor 21 ⁇ the diode 22 ⁇ the smoothing capacitor 24 ⁇ the diode 28 ⁇ the full wave rectifier circuit 9 ⁇ the capacitor 8 ⁇ the noise filter 5 ⁇ the AC power source 3. Current flows through the path.
  • the withstand voltage required for the smoothing capacitor 24 is calculated by predefining the maximum residual charge amount of the capacitor 8 and the voltage fluctuation range of the AC power supply 3 that are assumed when the power converter is operated. It is only necessary to select a component that satisfies this pressure resistance characteristic. However, since the withstand voltage characteristics of actually selectable capacitor parts are limited and large voltage fluctuations of the AC power supply 3 deviating from the range specified by the abnormality of the external power supply system or the like can occur. It is difficult to pre-select capacitor components that can cope with the situation.
  • FIG. 7 is a diagram showing operation waveforms of each part of the overvoltage protection circuit 41.
  • 7A shows the voltage between the terminals of the smoothing capacitor 24, and
  • FIGS. 7B and 7C show the on / off states of the switching elements 32 and 38, respectively.
  • D is the input voltage of the input port (IN-2) of the microcomputer 26, which is also the collector voltage of the photocoupler 35.
  • E and (f) show ON / OFF states of the relays 17 and 7, respectively.
  • the relay 17 when operating in the normal mode, the relay 17 is in the off state and the relay 7 is in the on state.
  • the relay 7 is in the on state.
  • an overvoltage is applied to the smoothing capacitor 24 through the current path shown in FIG. The voltage rises.
  • the switching element 32 is turned on. The turn-on means that the switching element shifts from the off state to the on state.
  • the discharge switching element 38 is subsequently turned on (time T3), and the photocoupler 35 is also turned on.
  • the switching element 38 is turned on, a discharge current flows from the smoothing capacitor 24 via the resistor 39, and the voltage between the terminals of the smoothing capacitor 24 decreases.
  • a low potential (GND potential) is input to the input port (IN-2) of the microcomputer 26, and the microcomputer 26 has an overvoltage state between the terminals of the smoothing capacitor 24. Recognize that.
  • the switching element 32 is turned off. Note that the turn-off means that the switching element shifts from the on state to the off state.
  • the discharge switching element 38 is subsequently turned off (time T5), and the photocoupler 35 is also turned off.
  • time T5 time T5
  • the switching element 38 is turned off, the flow of the discharge current flowing from the smoothing capacitor 24 via the resistor 39 is stopped, and the decrease in the voltage between the terminals of the smoothing capacitor 24 is also stopped.
  • the voltage value between the terminals of the smoothing capacitor 24 at the time when the voltage drop stops depends on the time delay width of turn-off of the switching element 32 and the switching element 38 and the resistance value of the resistor 39. In FIG. 7, the time delays of turning on and turning off the switching element 32 and the switching element 38 are exaggerated for easy explanation.
  • FIG. 8 is an enlarged view of a portion where the input voltage of the input port (IN-2) of the microcomputer 26 in FIG. 7 becomes a low potential (GND potential).
  • (d) and (f) are the same signal waveforms as those shown in FIG. 7, and (g) shows the sampling timing at which the microcomputer 26 samples the input voltage of the input port (IN-2). Is.
  • the microcomputer 26 samples the input voltage of the input port (IN-2) at the cycle Ts.
  • the value of the cycle Ts may be set in advance as a part of a processing program executed by the microcomputer 26 in a storage medium (not shown).
  • step S2 the input voltage at the input port (IN-2) of the microcomputer 26 is sampled (step S2). Sampling is performed every period Ts. The following processing is processing performed corresponding to one sampling value acquisition.
  • n is greater than or equal to Ns (step S6).
  • the Ns value may be held in advance in a memory element (not shown) as an overvoltage continuation state determination threshold value, or may be defined in the processing program of the microcomputer 26.
  • n ⁇ Ns it means that the sampling voltages for Ns times or more in succession were all at a low potential. Since the input voltage of the input port (IN-2) becomes a low potential when the overvoltage detection circuit 41a detects the overvoltage state, n ⁇ Ns means that the smoothing capacitor 24 of the discharge circuit 41b This means that the overvoltage state has not been resolved for at least (Ns ⁇ 1) ⁇ Ts time despite the discharge being performed.
  • the length of time during which such an overvoltage state continues is defined as an overvoltage duration Td.
  • the microcomputer 26 determines that the “overvoltage continuation state” when the overvoltage continuation time Td is equal to or longer than (Ns ⁇ 1) ⁇ Ts (step S7).
  • the relays 7 and 17 are turned off under the control of the microcomputer 26. If the relays 7 and 17 have already been turned off, the respective relays are kept off (step S8).
  • the relays 7 and 17 are turned off to cut off the power from the AC power supply 3, thereby eliminating the overvoltage state. This is an overvoltage elimination operation by software control.
  • the occurrence of the overvoltage continuation state may be notified to the user of the power conversion device by a display device (not shown) that the power interruption by the relays 7 and 17 has been performed.
  • the microcomputer 26 repeatedly executes the processing of steps S2 to S6 every time the input voltage of the input port (IN-2) is sampled until it is determined as “overvoltage continuation state”.
  • the overvoltage continuation time Td since the overvoltage continuation time Td is small, the sampling voltages for the continuous Ns times are not all low potentials, so the microcomputer 26 does not determine that the “overvoltage continuation state”.
  • the relays 7 and 17 are already in an off state and the AC power from the AC power supply 3 is cut off. Therefore, the situation in which the microcomputer 26 determines that the “overvoltage continuation state” is not likely to occur. For this reason, even when the voltage of the AC power supply 3 fluctuates instantaneously, the overvoltage state can be resolved only by the hardware operation of the overvoltage protection circuit 41.
  • the operation of the outdoor unit 1 is performed by switching the breaker 4 from the off state to the on state.
  • the mode is shifted to the “start (1)” state, AC power is supplied to the outdoor unit 1 through the above-described current paths of FIGS. 3 and 4 and the smoothing capacitor 24 is charged.
  • the microcomputer 26 is activated by the DC voltage from the DC / DC converter 25.
  • FIGS. Current also flows through the path.
  • FIG. 10 shows a current path when the voltage phase of the AC power supply 3 is positive
  • FIG. 11 shows a current path when the voltage phase of the AC power supply 3 is negative.
  • the AC power supply 3 when the voltage phase of the AC power supply 3 is positive, as shown in FIG. 10, the AC power supply 3 ⁇ the noise filter 5 ⁇ the PTC thermistor 16 ⁇ the diode 18 ⁇ the main circuit capacitor 15 ⁇ the full wave rectifier circuit 9 ⁇ noise. A current flows through the path of the filter 5 ⁇ the AC power source 3. As a result, the main circuit capacitor 15 is charged.
  • the AC power supply 3 when the voltage phase of the AC power supply 3 is negative, as shown in FIG. 11, the AC power supply 3 ⁇ the noise filter 5 ⁇ the full wave rectifier circuit 9 ⁇ the converter main circuit 10 ⁇ the main circuit capacitor 15 ⁇ the diode 27 ⁇ the smoothing capacitor.
  • the converter main circuit 10 has not yet started the step-up operation, and the switching elements 12a and 12b are not driven on / off.
  • the switching element 12a is short-circuited, the inside of the switching element 12a becomes conductive.
  • a voltage obtained by adding the voltage between the terminals of the main circuit capacitor 15 and the voltage of the AC power supply 3 is applied between the terminals of the smoothing capacitor 24, thereby generating an overvoltage state between the terminals of the smoothing capacitor 24.
  • the voltage boosting operation for the smoothing capacitor 24 is repeated every voltage cycle of the AC power supply 3, and the overvoltage state of the smoothing capacitor 24 continues to occur.
  • FIGS. 12 and 13 show the operation timing of the overvoltage protection circuit 41 when the operation mode of the outdoor unit 1 transitions from the “start (1)” state to the “start (2)” state, as in FIGS. 7 and 8. It is a thing.
  • the relay 17 and the relay 7 are in an off state during operation in the start (1) mode.
  • a current flows in the current path shown in FIGS. 10 and 11 corresponding to the voltage phase of the AC power supply 3.
  • an overvoltage is applied to the smoothing capacitor 24, and the voltage across the terminals of the smoothing capacitor 24 increases.
  • the switching element 32 is turned on.
  • the discharge switching element 38 is subsequently turned on (time T13), and the photocoupler 35 is also turned on.
  • a discharge current flows from the smoothing capacitor 24 via the resistor 39.
  • a low potential (GND potential) is input to the input port (IN-2) of the microcomputer 26, and the microcomputer 26 is in an overvoltage state between the terminals of the smoothing capacitor 24.
  • the electric charge of the smoothing capacitor 24 is discharged by the operation of the discharge circuit 41b.
  • the step-up operation is repeated in the voltage cycle of the AC power supply 3, and therefore, the smoothing capacitor 24 is shown in FIGS. It is repeatedly charged in the current path. For this reason, the voltage between the terminals of the smoothing capacitor 24 continues to increase.
  • the relay 17 is switched from the on state to the off state. Since the relay 7 is in the off state in the start (2) mode, the off state is maintained. In addition, when the relay 7 is in an on state due to a malfunction or the like, the relay 7 is also switched to an off state. When the relay 17 is turned off, the charging path of the smoothing capacitor 24 is interrupted. And the discharge of the smoothing capacitor 24 by the discharge circuit 41b continues, so that the voltage across the terminals of the smoothing capacitor 24 decreases before reaching the withstand voltage level of the component. In this way, it is possible to prevent a component failure due to overvoltage.
  • the switching element 32 When the voltage between the terminals of the smoothing capacitor 24 becomes smaller than the determination voltage threshold Vth1 for overvoltage detection (time T15), the switching element 32 is turned off, and then the discharge switching element 38 and the photocoupler 35 are also turned off (time T16). . Thereby, although the input voltage of the input port (IN-2) of the microcomputer 26 changes to a high potential, the microcomputer 26 maintains the relay 17 in the OFF state until the entire air conditioner including the outdoor unit 1 is restarted.
  • the microcomputer 26 restarts the entire air conditioner system, thereby restarting the process from the operation mode in the “stop” state. Similarly, after the air conditioner system is restarted, when the microcomputer 26 detects the “overvoltage continuation state”, it restarts again.
  • the “overvoltage continuation state” is detected after restarting Nf times continuously, the occurrence of the overvoltage state is not temporary, and there is a high possibility that the converter main circuit 10 is faulty. Stop the startup process.
  • the Nf value may be stored in advance in a memory element (not shown) as a system failure determination threshold value or may be defined in the processing program of the microcomputer 26.
  • the overvoltage detection circuit 41a detects the overvoltage state even if the voltage between the terminals of the smoothing capacitor 24 becomes an overvoltage state at the time of transition to the reactive power reduction mode or at the time of a short circuit failure of the converter main circuit 10, etc. Since the overvoltage protection circuit 41 is configured so that the circuit 41b discharges the electric charge of the smoothing capacitor 24, the voltage between the terminals of the smoothing capacitor 24 can be suppressed to a voltage level that does not exceed the component breakdown voltage.
  • the charging path of the smoothing capacitor 24 and the converter main circuit 10 are turned off by turning off the relay 7 and the relay 17 under the control of the microcomputer 26. Even in such a case, the voltage between the terminals of the smoothing capacitor 24 can be suppressed to a voltage level that does not exceed the component withstand voltage, and the circuit components including the converter main circuit 10 are caused by overvoltage. It can protect against component failure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Rectifiers (AREA)

Abstract

L'objet de la présente invention est d'obtenir un dispositif de conversion de puissance pouvant protéger des composants de circuit d'un endommagement dû à une surtension, y compris dans le cas où un état de surtension est survenu à cause d'un endommagement de composants. L'invention concerne ainsi un dispositif de conversion de puissance comprenant : un circuit de détection de surtension 41a permettant de détecter un état de surtension sur la base de la tension inter-bornes d'un condensateur de lissage 24 d'un second circuit de redressement ; un circuit de décharge 41b permettant de décharger une charge électrique du condensateur de lissage 24 lorsque le circuit de détection de surtension 41a a détecté un état de surtension ; et un micro-ordinateur 26 permettant de détecter un état de surtension continu sur la base de l'état de surtension détecté par le circuit de détection de surtension 41a, et de commander un relais 7 et un relais 17.
PCT/JP2015/066203 2015-06-04 2015-06-04 Dispositif de conversion de puissance WO2016194197A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2015/066203 WO2016194197A1 (fr) 2015-06-04 2015-06-04 Dispositif de conversion de puissance
JP2017521448A JP6265304B2 (ja) 2015-06-04 2015-06-04 電力変換装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/066203 WO2016194197A1 (fr) 2015-06-04 2015-06-04 Dispositif de conversion de puissance

Publications (1)

Publication Number Publication Date
WO2016194197A1 true WO2016194197A1 (fr) 2016-12-08

Family

ID=57441406

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/066203 WO2016194197A1 (fr) 2015-06-04 2015-06-04 Dispositif de conversion de puissance

Country Status (2)

Country Link
JP (1) JP6265304B2 (fr)
WO (1) WO2016194197A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018216655A1 (fr) * 2017-05-25 2018-11-29 パナソニック アプライアンシズ リフリジレーション デヴァイシズ シンガポール Dispositif d'entraînement de compresseur, unité de commande l'utilisant, unité de compresseur et refroidisseur
JP2019054633A (ja) * 2017-09-14 2019-04-04 新電元工業株式会社 電源装置、半導体集積回路、及び、電源装置の制御方法
CN113541106A (zh) * 2021-05-28 2021-10-22 国网浙江省电力有限公司营销服务中心 一种断路器电源的电容保护电路
US20210388791A1 (en) * 2020-06-10 2021-12-16 Denso Corporation Injection control device
JP2022113826A (ja) * 2017-03-28 2022-08-04 ダイキン工業株式会社 熱源ユニット

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102192789B1 (ko) * 2019-02-25 2020-12-18 엘지전자 주식회사 전력변환장치 및 이를 구비하는 공기조화기

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010178540A (ja) * 2009-01-30 2010-08-12 Toshiba Mitsubishi-Electric Industrial System Corp 電力変換装置
JP2015096009A (ja) * 2013-11-14 2015-05-18 ローム株式会社 Ａｃ／ｄｃコンバータおよびその保護回路、電源回路、電源アダプタおよび電子機器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5281471B2 (ja) * 2009-04-24 2013-09-04 パナソニック株式会社 電源装置
JP5424031B2 (ja) * 2009-08-31 2014-02-26 サンケン電気株式会社 力率改善回路
JP5052590B2 (ja) * 2009-12-16 2012-10-17 三菱電機株式会社 電源回路及び照明装置
JP5761301B2 (ja) * 2013-10-25 2015-08-12 三菱電機株式会社 点灯装置および照明器具

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010178540A (ja) * 2009-01-30 2010-08-12 Toshiba Mitsubishi-Electric Industrial System Corp 電力変換装置
JP2015096009A (ja) * 2013-11-14 2015-05-18 ローム株式会社 Ａｃ／ｄｃコンバータおよびその保護回路、電源回路、電源アダプタおよび電子機器

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022113826A (ja) * 2017-03-28 2022-08-04 ダイキン工業株式会社 熱源ユニット
WO2018216655A1 (fr) * 2017-05-25 2018-11-29 パナソニック アプライアンシズ リフリジレーション デヴァイシズ シンガポール Dispositif d'entraînement de compresseur, unité de commande l'utilisant, unité de compresseur et refroidisseur
JP2019054633A (ja) * 2017-09-14 2019-04-04 新電元工業株式会社 電源装置、半導体集積回路、及び、電源装置の制御方法
US20210388791A1 (en) * 2020-06-10 2021-12-16 Denso Corporation Injection control device
US11808228B2 (en) * 2020-06-10 2023-11-07 Denso Corporation Injection control device
CN113541106A (zh) * 2021-05-28 2021-10-22 国网浙江省电力有限公司营销服务中心 一种断路器电源的电容保护电路

Also Published As

Publication number Publication date
JP6265304B2 (ja) 2018-01-24
JPWO2016194197A1 (ja) 2017-09-28

Similar Documents

Publication Publication Date Title
JP6265304B2 (ja) 電力変換装置
CN100456612C (zh) 开关电源装置
US8472216B2 (en) Circuit arrangement and control circuit for a power-supply unit, computer power-supply unit and method for switching a power-supply unit
JP3572292B2 (ja) スイッチング電源回路
CN111602009B (zh) 空调机
EP1557935A1 (fr) Appareil de commande d'un onduleur alimentant un moteur et climatisation utilisant un tel appareil
CN101268597A (zh) 用继电器为交流到直流转换器实现主动涌流控制
US11011975B2 (en) Boost power factor correction conversion
US20190237994A1 (en) Uninterruptible power supply
WO2018043226A1 (fr) Dispositif d'alimentation à découpage et dispositif à semi-conducteur
JP6378982B2 (ja) インバータ回路
EP2001096B1 (fr) Controleur
JP3401238B2 (ja) ワールドワイド電源装置
JP4875307B2 (ja) 倍圧整流と全波整流の切換え制御方法
JP2014117088A (ja) スイッチング電源装置の制御回路
JP2017123740A (ja) スイッチング電源
CN111786361A (zh) 家用电器及用于家用电器的pfc限流保护控制电路与方法
JP2003259648A (ja) 交流−直流変換装置
KR20010037395A (ko) 인버터 공기조화기의 제어방법 및 장치
JP2005201587A (ja) 空気調和機の制御装置
KR102001449B1 (ko) 히컵 동작을 하는 소프트 스타트 회로 및 이를 구비한 전력변환 장치
JP6106981B2 (ja) 電子回路装置
JP2019007709A (ja) 電子機器
JP2020124063A (ja) 電源装置
KR100308563B1 (ko) 분리형 공기조화기의 실외기 전원공급장치및 그 방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15894230

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2017521448

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15894230

Country of ref document: EP

Kind code of ref document: A1