WO2024075305A1 - Dispositif de conversion de puissance électrique - Google Patents

Dispositif de conversion de puissance électrique Download PDF

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Publication number
WO2024075305A1
WO2024075305A1 PCT/JP2022/037731 JP2022037731W WO2024075305A1 WO 2024075305 A1 WO2024075305 A1 WO 2024075305A1 JP 2022037731 W JP2022037731 W JP 2022037731W WO 2024075305 A1 WO2024075305 A1 WO 2024075305A1
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Prior art keywords
power supply
voltage
supply circuit
circuit
gate
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PCT/JP2022/037731
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English (en)
Japanese (ja)
Inventor
チャン タオ ブイ
光一 八幡
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日立Astemo株式会社
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Priority to PCT/JP2022/037731 priority Critical patent/WO2024075305A1/fr
Publication of WO2024075305A1 publication Critical patent/WO2024075305A1/fr

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    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the present invention relates to a power conversion device.
  • a power conversion device that converts DC power to AC power has multiple phases of upper and lower arm series circuits, each consisting of an upper arm switching element and a lower arm switching element connected in series.
  • the switching elements are driven by a drive signal output from a controller via a gate drive circuit.
  • the controller is normally powered by a low voltage power supply, but is equipped with a backup power supply circuit to compensate for its operation even if the low voltage power supply is lost.
  • Power for the backup power supply circuit is supplied from a high voltage power supply different from the low voltage power supply, and in this case a startup circuit is required to step down the voltage of the high voltage power supply and start up the backup power supply circuit.
  • Patent Document 1 discloses an inverter control circuit that turns on a specific switching element even when an abnormality occurs in the low-voltage power supply, without adding a dedicated microcomputer.
  • Patent Document 2 discloses a device that smoothly controls an inverter even when the power supply to the inverter's control circuit is lost, while preventing an increase in the device size.
  • Patent Documents 1 and 2 do not disclose the omission of a startup circuit that starts up the backup power supply circuit.
  • the power conversion device comprises switching elements connected in series to upper and lower arms, a gate drive circuit for driving the switching elements, a controller that operates with a predetermined low voltage supplied from a low-voltage power supply and outputs a drive signal for driving the switching elements to the gate drive circuit, a gate power supply circuit that generates a gate drive voltage for operating the gate drive circuit and supplies the generated gate drive voltage to the gate drive circuit, and a backup power supply circuit that controls the current supplied from the high-voltage power supply to the primary winding of an isolation transformer to generate a backup voltage in place of the low voltage and supplies the generated backup voltage to the controller, and the backup power supply circuit is started by the start-up voltage output from the gate power supply circuit.
  • the startup circuit that starts the backup power supply circuit can be omitted.
  • FIG. 1 is a diagram showing the overall configuration of a power conversion device according to a first embodiment.
  • FIG. 2 is a detailed configuration diagram of a main part of the power conversion device according to the first embodiment.
  • 3A to 3F are timing charts showing the operation of the backup power supply circuit in the first embodiment.
  • FIG. 4 is a diagram showing a wiring pattern of the power conversion device according to the first embodiment.
  • FIG. 5 is a diagram showing a wiring pattern of a power conversion device in a comparative example.
  • FIG. 6 is a diagram showing the overall configuration of a power conversion device according to the second embodiment.
  • FIG. 7 is a detailed configuration diagram of a main part of a power conversion device according to the second embodiment.
  • 8A to 8G are timing charts showing the operations of the backup power supply circuit and the gate power supply circuit in the second embodiment.
  • FIG. 1 is an overall configuration diagram of a power conversion device 1000 according to the first embodiment.
  • the power conversion device 1000 converts DC power supplied from a DC high-voltage power supply 2000 such as a battery into AC power to drive a motor 3000.
  • the high-voltage power supply 2000 supplies DC power between a positive bus bar P and a negative bus bar N of the power conversion device 1000 via a contactor 2001.
  • the motor 3000 is, for example, a three-phase induction motor, and is used as a drive source for a vehicle.
  • the motor 3000 is provided with an angle sensor 3001 such as a resolver that outputs a rotation angle.
  • the power conversion device 1000 includes a capacitor module 100 that is connected in parallel between the positive bus bar P and the negative bus bar N and smooths the DC current, a voltage detector 200 that detects the DC voltage between the positive bus bar P and the negative bus bar N, and an inverter circuit 400 that performs power conversion. It also includes a DC current detector 300 that detects the series current flowing through the positive bus bar P.
  • the power conversion device 1000 further includes an output current detector 500, a backup power supply circuit 700, a gate power supply circuit 800, a gate drive circuit 900, and a controller 910.
  • the backup power supply circuit 700, gate power supply circuit 800, gate drive circuit 900, and controller 910 are arranged on a substrate 600.
  • the substrate 600 is divided into a high-voltage side 600H and a low-voltage side 600L, and the backup power supply circuit 700 and gate power supply circuit 800 are separated into the high-voltage side 600H and the low-voltage side 600L by an insulating element 600a such as a transformer.
  • the gate drive circuit 900 is arranged on the high-voltage side 600H of the substrate 600, and the controller 910 is arranged on the low-voltage side 600L of the substrate 600.
  • the inverter circuit 400 includes a power module 410 that configures an upper and lower arm series circuit consisting of a switching element 411 and a diode 412 that operate as an upper arm, and a switching element 421 and a diode 422 that operate as a lower arm.
  • Three phases (U-phase, V-phase, and W-phase) of this power module 410 are provided corresponding to each phase winding of the motor 3000. That is, the inverter circuit 400 includes three phases of arms each formed by connecting an upper arm switching element 411 and a lower arm switching element 421 in series between a DC positive bus bar P and a DC negative bus bar N.
  • an example of three phases is described, but it is also possible to configure the power module 410 for multiple phases according to the number of phases of the motor 3000.
  • the upper arm switching element 411 and the lower arm switching element 421 are provided with emitter sense terminals, which are connected to a gate drive circuit 900 in order to detect the current flowing through the switching elements 411 and 421 .
  • the emitter of the lower arm switching element 421 is connected to ground GND3 in the gate drive circuit 900.
  • the emitters of the lower arm switching elements 421 of the other phases are similarly connected to grounds GND2 and GND1 in the gate drive circuit 900.
  • a drive signal Pw which is a PWM signal output from a controller 910 , is input to the base terminals of the switching elements 411 and 421 via a gate drive circuit 900 .
  • the switching elements 411 and 421 are, for example, insulated gate bipolar transistors (IGBTs), metal oxide semiconductor field effect transistors (MOSFETs), super junction metal oxide semiconductor field effect transistors (SJ-MOSFETs), or power semiconductor elements made of materials such as silicon carbide (SiC) and gallium nitride (GaN).
  • the output current detector 500 detects the AC current output from the connection point between the upper arm switching element and the lower arm switching element for each phase, and outputs each detection value to the controller 910.
  • a low-voltage DC power supply 4000 such as a battery is provided outside the power conversion device 1000.
  • a contactor 4001 is turned on in response to the vehicle's ignition key, and the controller 910 is supplied with a low voltage from the low-voltage power supply 4000 via a diode D1.
  • a drive signal Pw is output to the gate drive circuit 900 in response to a torque command from a higher-level controller (not shown), a detected voltage from the voltage detector 200, a detected DC current value from the DC current detector 300, an output current detected value from the output current detector 500, and a rotation angle from the angle sensor 3001.
  • the backup power supply circuit 700 generates a backup voltage to replace the low voltage supplied from the low voltage power supply 4000 by controlling the current supplied to the primary winding of the isolation transformer based on the power supplied from the high voltage power supply 2000 via the positive bus bar P, and supplies this to the controller 910 and the gate power supply circuit 800 via diode D2.
  • This backup power supply circuit 700 is started by the start-up voltage (details will be described later) output from the gate power supply circuit 800 being supplied via a backflow prevention diode D0 and a current limiting resistor R0.
  • the backflow prevention diode D0 and the current limiting resistor R0 prevent the gate power supply circuit 800 from becoming overloaded and overvoltage when the voltage of the backup power supply circuit 700 is abnormal. Details of the backup power supply circuit 700 will be described later.
  • the gate power supply circuit 800 generates a gate drive voltage for operating the gate drive circuit 900 based on the low voltage from the low voltage power supply 4000 or the backup voltage from the backup power supply circuit 700, and supplies the generated gate drive voltage to the gate drive circuit 900.
  • the gate power supply circuit 800 and the controller 910 are normally supplied with a low voltage from the low voltage power supply 4000, but if a malfunction occurs and the low voltage is no longer supplied from the low voltage power supply 4000, the backup voltage is supplied from the backup power supply circuit 700 to replace the low voltage.
  • the gate drive circuit 900 operates using a gate drive voltage supplied from the gate power supply circuit 800, and drives the switching elements 411, 421 based on a drive signal Pw output from the controller 910. Grounds GND1, GND2, and GND3 in the gate drive circuit 900 are connected to ground GND0 in the backup power supply circuit 700. Details of the gate drive circuit 900 will be described later.
  • FIG. 2 is a detailed configuration diagram of a main part of the power conversion device 1000 according to the first embodiment. 2 shows the power modules 410 for one phase, and does not show the other phases. Also, the gate power supply circuit 800 and the gate drive circuit 900 corresponding to the lower arm switching element 421 are shown, and the gate power supply circuit 800 and the gate drive circuit 900 corresponding to the upper arm switching element 411 are not shown.
  • the backup power supply circuit 700 includes a first power supply IC710 and an isolation transformer TB1.
  • One end of the primary winding Nb1 of the isolation transformer TB1 is supplied with power from the high-voltage power supply 2000 via a positive bus bar P.
  • the other end of the primary winding Nb1 of the isolation transformer TB1 is connected to ground GND0 via a resistor R1 via a field effect transistor FE1.
  • the first power supply IC710 starts up when the start-up voltage Va generated by the gate power supply circuit 800 is supplied to its power supply terminal Vcc via the backflow prevention diode D0 and current limiting resistor R0. Then, the field effect transistor FE1 is switched by a signal output from the signal terminal SW to generate a backup voltage Vb by a flyback that operates using the secondary winding Nb2 of the isolation transformer TB1, a diode, and a capacitor.
  • This backup voltage Vb is supplied to the controller 910 and the gate power supply circuit 800. Note that this backup voltage Vb is also supplied to the gate power supply circuit 800 corresponding to the upper arm switching element 411 (not shown).
  • an auxiliary winding Nbc is provided in the insulating transformer TB1, and a feedback voltage Vf is generated using the output voltage from the auxiliary winding Nbc.
  • This feedback voltage Vf is supplied to the power supply terminal Vcc of the first power supply IC710 via a diode, and is divided and input to the feedback terminal FB of the first power supply IC710.
  • the first power supply IC710 controls the switching of the field effect transistor FE1 so that the divided voltage of the feedback voltage Vf input to the feedback terminal FB becomes a predetermined set voltage.
  • the voltage of the feedback voltage Vf is set to a voltage higher than the startup voltage Va, the first power supply IC710 continues to operate using power from the feedback voltage Vf after it is started. As a result, after the first power supply IC710 is started by the startup voltage Va generated by the gate power supply circuit 800, it continues to operate using the feedback voltage Vf.
  • the gate power supply circuit 800 includes a second power supply IC 810 and an insulating transformer TG1.
  • the second power supply IC 810 has a power supply terminal Vcc supplied with a low voltage from the low voltage power supply 4000 or a backup voltage Vb from the backup power supply circuit 700.
  • One end of the primary winding Ng1 of the insulating transformer TG1 is connected to the power supply terminal Vcc of the second power supply IC 810, and the other end of the field effect transistor FE2 is connected to the low voltage side ground GND4 via a resistor R2.
  • the second power supply IC810 controls the switching of the field effect transistor FE2 by a signal output from the signal terminal SW, and generates a gate drive voltage by a flyback that operates with the secondary winding Ng2 of the insulating transformer TG1, a diode, and a capacitor.
  • the secondary winding Ng2 of the insulating transformer TG1 has three windings corresponding to the three gate drive circuits GD1, GD2, and GD3 that drive the lower arm switching element 421, and each generates a gate drive voltage.
  • the gate drive voltage supplied to one gate drive circuit GD3 is supplied to the backup power supply circuit 700 as a start-up voltage Va via a backflow prevention diode D0 and a current limiting resistor R0.
  • an auxiliary winding Ngc is provided in the insulating transformer TG1, and a feedback voltage generated using the output voltage from this auxiliary winding Ngc is input to the feedback terminal FB of the second power supply IC810.
  • the second power supply IC810 controls the switching of the field effect transistor FE2 so that the feedback voltage input to the feedback terminal FB becomes a predetermined set voltage.
  • the gate drive circuit 900 shows three gate drive circuits GD1, GD2, and GD3 that drive the switching element 421 of the lower arm.
  • the emitter of the switching element 421 is connected to ground GND3
  • the base of the switching element 421 is connected to a terminal for a drive signal Pw
  • the emitter sense is connected to a terminal Es.
  • the same is true for the gate drive circuits GD1 and GD2.
  • the drive signal Pw output from the controller 910 is input to the base of the switching element 421, driving the switching element 421 by turning it on and off.
  • the current flowing through the switching element 421 is sent from the emitter sense to the controller 910 via the gate drive circuit GD3, and the controller 910 controls overcurrent, etc.
  • the gate drive circuits GD1, GD2, and GD3 drive the switching elements 421 of the lower arms of the respective phases, but the grounds GND1, GND2, and GND3 of the gate drive circuits GD1, GD2, and GD3, i.e., the emitters of the switching elements 421 of the lower arms of the respective phases, are connected to the ground GND0 in the backup power supply circuit 700. The reason for this will be explained later.
  • FIGS. 3(A) to 3(F) are timing charts showing the operation of the backup power supply circuit 700 in the first embodiment.
  • FIG. 3(A) shows the low voltage supplied from the low-voltage power supply 4000
  • FIG. 3(B) shows the start-up voltage Va supplied from the gate drive circuit GD3
  • FIG. 3(C) shows the signal output from the signal terminal SW of the first power supply IC 710
  • FIG. 3(D) shows the high voltage supplied from the high-voltage power supply 2000
  • FIG. 3(E) shows the feedback voltage Vf generated by the backup power supply circuit 700
  • FIG. 3(F) shows the backup voltage Vb generated by the backup power supply circuit 700.
  • the gate power supply circuit 800 starts up and the startup voltage Va becomes greater than the operable voltage vj of the first power supply IC 710 of the backup power supply circuit 700 as shown in FIG. 3(B), the first power supply IC 710 starts switching control operation as shown in FIG. 3(C).
  • the startup voltage Va of 15V is one example.
  • the high-voltage power supply 2000 gradually rises to, for example, 400V as shown in FIG. 3(D) and supplies power to the backup power supply circuit 700.
  • a high voltage is applied to the primary winding Nb1 of the insulating transformer TB1 to generate a feedback voltage Vf.
  • the feedback voltage Vf is controlled to a voltage higher than the start-up voltage Va, for example, 16V, by the switching control of the field effect transistor FE1 performed by the first power supply IC710.
  • the backup power supply circuit 700 generates a backup voltage Vb as shown in FIG. 3(F).
  • the backup voltage Vb is, for example, 8V.
  • the backup power supply circuit 700 When the contactor 4001 is turned on, the backup power supply circuit 700 enters an operating state after a time Tb. Since power is being supplied to the backup power supply circuit 700 from the high-voltage power supply 2000, even if the low voltage is not supplied from the low-voltage power supply 4000 due to some malfunction, the backup voltage Vb is supplied from the backup power supply circuit 700.
  • FIG. 4 is a diagram showing a wiring pattern of the power conversion device 1000 in the first embodiment.
  • the substrate 600 is divided into a high voltage side 600H and a low voltage side 600L, and the backup power supply circuit 700 and the gate power supply circuit 800 are separated into the high voltage side 600H and the low voltage side 600L by an insulating element 600a such as an insulating transformer TB1.
  • the gate drive circuit 900 is disposed on the high voltage side 600H of the substrate 600, and the controller 910 is disposed in a circuit region 600R on the low voltage side 600L of the substrate 600.
  • the inverter circuit 400 is connected between the positive bus bar P and the negative bus bar N, and the switching elements 411 and 421 in the inverter circuit 400 are connected to a wiring pattern on the substrate 600, but the connection state is omitted.
  • the gate drive circuit 900 supplies the startup voltage Va to the backup power supply circuit 700.
  • the grounds GND1, GND2, and GND3 of the gate drive circuit 900 i.e., the emitter 412E of the switching element 421, are connected to the ground GND0 in the backup power supply circuit 700 via the gate drive circuit 900.
  • the low-voltage power supply 4000 supplies a low voltage to electronic components in the circuit area 600R of the low-voltage side 600L, such as the controller 910.
  • the high-voltage power supply 2000 supplies a high voltage to electronic components on the high-voltage side 600H of the power conversion device 1000 via the positive bus bar P and the negative bus bar N.
  • the negative bus bar N is then connected to grounds GND1, GND2, and GND3 that are referenced to the emitter 412E of the switching element 421.
  • ground GND0 of the backup power supply circuit 700 is connected to emitter-referenced grounds GND1, GND2, and GND3 of the gate drive circuit 900, and the emitter-referenced grounds GND1, GND2, and GND3 are connected to the negative pole of the high-voltage power supply 2000 via the negative bus bar N.
  • FIG. 5 is a diagram showing the wiring pattern of the power conversion device 1000 in a comparative example.
  • the comparative example shown in FIG. 5 is an example in which the first embodiment is not applied, and is an example for comparison with the first embodiment.
  • the same parts as in FIG. 4 are given the same reference numerals, and their explanation will be simplified.
  • the ground GND0 of the backup power circuit 700 is connected to the negative bus bar N.
  • a loop current is generated between the emitter of the gate drive circuit 900 and the negative bus bar N, which is the ground GND0 of the backup power circuit 700, causing a potential difference between the gate drive circuit 900 and the backup power circuit 700.
  • the operation of the gate drive circuit 900 and the backup power circuit 700 can be stabilized.
  • the backup power supply circuit 700 is started by the gate power supply circuit 800 that supplies power to the gate drive circuit 900, so that a startup circuit that is separately provided for starting the backup power supply circuit can be omitted, thereby reducing component costs and the mounting area on the board.
  • FIG. 6 is an overall configuration diagram of a power conversion device 1000 in the second embodiment.
  • a backup voltage was supplied from the backup power supply circuit to the gate power supply circuit and the controller, but in the second embodiment, a backup voltage is supplied from the backup power supply circuit to the controller, and a high voltage is supplied to the gate power supply circuit.
  • the same reference numerals are used to designate the same parts as those in Fig. 1 of the first embodiment, and their description will be simplified.
  • the backup power supply circuit 700, gate power supply circuit 800, gate drive circuit 900, controller 910, and voltage conversion circuit 920 are arranged on a substrate 600.
  • the substrate 600 is divided into a high-voltage side 600H and a low-voltage side 600L by an insulating element 600a, and the backup power supply circuit 700 is separated into the high-voltage side 600H and the low-voltage side 600L by an insulating element 600a such as a transformer.
  • the gate power supply circuit 800, gate drive circuit 900, and voltage conversion circuit 920 are arranged on the high-voltage side 600H, and the controller 910 is arranged on the low-voltage side 600L of the substrate 600.
  • the backup power supply circuit 700 generates a backup voltage to replace the low voltage supplied from the low voltage power supply 4000 by controlling the current supplied to the primary winding of the isolation transformer based on the power supplied from the high voltage power supply 2000 via the positive bus bar P and negative bus bar N, and supplies it to the controller 910 via diode D2.
  • This backup power supply circuit 700 is started by the start-up voltage output from the gate power supply circuit 800 being supplied via a backflow prevention diode D0 and a current limiting resistor R0.
  • the backflow prevention diode D0 and the current limiting resistor R0 prevent the gate power supply circuit 800 from becoming overloaded and overvoltage when the voltage of the backup power supply circuit 700 is abnormal.
  • the controller 910 is normally supplied with a low voltage from the low-voltage power supply 4000, but if some malfunction occurs and the low voltage is no longer supplied from the low-voltage power supply 4000, a backup voltage is supplied from the backup power supply circuit 700 to replace the low voltage. Details of the backup power supply circuit 700 will be described later.
  • the gate power supply circuit 800 generates a gate drive voltage for operating the gate drive circuit 900 based on the power supplied from the high-voltage power supply 2000 via the positive bus bar P and the negative bus bar N, and supplies the generated gate drive voltage to the gate drive circuit 900.
  • the gate drive circuit 900 drives the switching elements 411 and 421 based on the drive signal Pw output from the controller 910.
  • the emitters of the switching elements 421 of each phase of the lower arm were connected to the ground in the gate drive circuit 900, but in this embodiment, they are not connected. Furthermore, the ground in the gate drive circuit 900 is not connected to the ground in the backup power supply circuit 700.
  • the voltage conversion circuit 920 reduces the high voltage supplied from the high-voltage power supply 2000 via the positive bus bar P and the negative bus bar N to a predetermined operating voltage for operating the gate power supply circuit 800. After the operating voltage supplied from the voltage conversion circuit 920 exceeds a predetermined value, the gate power supply circuit 800 outputs a start-up voltage to the backup power supply circuit 700 via the backflow prevention diode D0 and the current limiting resistor R0, and starts up the backup power supply circuit 700.
  • FIG. 7 is a detailed configuration diagram of a main part of a power conversion device 1000 according to the second embodiment. 7 shows a gate power supply circuit 800 and a gate drive circuit 900 corresponding to the lower arm switching element 421, and does not show the gate power supply circuit 800 and the gate drive circuit 900 corresponding to the upper arm switching element 411.
  • the same reference numerals are used to designate the same parts as those in the first embodiment in FIG. 2, and the description thereof will be simplified.
  • the backup power supply circuit 700 includes a first power supply IC710 and an isolation transformer TB1.
  • One end of the primary winding Nb1 of the isolation transformer TB1 is supplied with power from the high-voltage power supply 2000 via a positive bus bar P.
  • the other end of the primary winding Nb1 of the isolation transformer TB1 is connected to the ground GND0 of the first power supply IC710 via a resistor R1 via a field effect transistor FE1.
  • the ground GND0 is connected to the negative bus bar N.
  • the first power supply IC710 starts up when the start-up voltage Va generated by the gate power supply circuit 800 is supplied to its power supply terminal Vcc via the backflow prevention diode D0 and current limiting resistor R0. Then, the field effect transistor FE1 is switched by a signal output from the signal terminal SW, and a backup voltage Vb is generated by a flyback that operates using the secondary winding Nb2 of the isolation transformer TB1, a diode, and a capacitor. This backup voltage Vb is supplied to the controller 910.
  • an auxiliary winding Nbc is provided in the isolation transformer TB1, and the feedback voltage Vf1 is generated using the output voltage from the auxiliary winding Nbc.
  • This feedback voltage Vf1 is supplied to the power supply terminal Vcc of the first power supply IC710 via a diode, and is divided to a predetermined voltage and input to the feedback terminal FB of the first power supply IC710.
  • the first power supply IC710 controls the switching of the field effect transistor FE1 so that the divided voltage of the feedback voltage Vf1 input to the feedback terminal FB becomes a predetermined set voltage.
  • the voltage of the feedback voltage Vf1 is set to a voltage higher than the startup voltage Va, so that after the startup of the first power supply IC710, the operation of the first power supply IC710 continues using the power from the feedback voltage Vf1.
  • the voltage conversion circuit 920 is formed by connecting a series circuit of a field effect transistor FE3 and a Zener diode Z3 between the positive bus bar P and the negative bus bar N.
  • the voltage from the positive bus bar P is input to the gate of the field effect transistor FE3 via a resistor R3.
  • the connection point between the field effect transistor FE3 and the Zener diode Z3 is input to the power supply terminal Vcc of the second power supply IC 810 via a diode D3.
  • the voltage conversion circuit 920 converts the voltage from the high-voltage power supply 2000 into the operating voltage of the second power supply IC 810 of the gate power supply circuit 800.
  • the output from the connection point between the field effect transistor FE3 and the Zener diode Z3 of this voltage conversion circuit 920 is also supplied to the gate power supply circuit 800 corresponding to the upper arm switching element 411 (not shown).
  • the gate power supply circuit 800 includes a second power supply IC810 and an isolation transformer TG1.
  • the second power supply IC810 is activated when the operating voltage supplied from the voltage conversion circuit 920 to the power supply terminal Vcc exceeds a predetermined value, and controls the switching of the field effect transistor FE2 by a signal output from the signal terminal SW, generating a gate drive voltage by the secondary winding Ng2 of the isolation transformer TG1 and a flyback that operates using a diode and a capacitor.
  • the isolation transformer TG1 has three secondary windings Ng2 corresponding to the three gate drive circuits GD1, GD2, GD3 that drive the switching element 421 of the lower arm, and each generates a gate drive voltage.
  • the insulating transformer TG1 is also provided with an auxiliary winding Ngc, and the feedback voltage Vf2 generated using the output voltage from this auxiliary winding Ngc is divided and input to the feedback terminal FB of the second power supply IC810.
  • the second power supply IC810 of the gate power supply circuit 800 controls the switching of the field effect transistor FE2 so that the divided voltage of the feedback voltage Vf2 input to the feedback terminal FB becomes a predetermined set voltage.
  • the feedback voltage Vf2 is also input to the power supply terminal Vcc of the second power supply IC810 via the diode D4. That is, the feedback voltage Vf2 or the operating voltage from the voltage conversion circuit 920 is supplied to the power supply terminal Vcc of the second power supply IC810.
  • the second power supply IC 810 since the feedback voltage Vf2 is set to a voltage higher than the operating voltage from the voltage conversion circuit 920, after the second power supply IC 810 is started up, the second power supply IC 810 continues to operate using power from the feedback voltage Vf2. Also, the feedback voltage Vf2 is input as a start-up voltage Va to the power supply terminal Vcc of the first power supply IC 710 in the backup power supply circuit 700 via the backflow prevention diode D0 and the current limiting resistor R0, starting up the backup power supply circuit 700. In other words, after the operating voltage supplied from the voltage conversion circuit 920 exceeds a predetermined value, the gate power supply circuit 800 generates the start-up voltage Va to start up the backup power supply circuit 700.
  • the gate drive circuit 900 shows three gate drive circuits GD1, GD2, and GD3 that drive the lower arm switching element 421.
  • a drive signal Pw output from the controller 910 is input to the base of the switching element 421, driving the switching element 421 by turning it on and off.
  • the three gate drive circuits that drive the upper arm switching element 411, not shown, also have a similar configuration.
  • FIGS. 8(A) to 8(G) are timing charts showing the operation of the backup power supply circuit 700 and the gate power supply circuit 800 in the second embodiment.
  • FIG. 8(A) shows the high voltage supplied from the high-voltage power supply 2000
  • FIG. 8(B) shows the operating voltage of the second power supply IC 810 supplied from the voltage conversion circuit 920
  • FIG. 8(C) shows the signal output from the signal terminal SW of the second power supply IC 810
  • FIG. 8(D) shows the feedback voltage Vf2 generated by the gate power supply circuit 800
  • FIG. 8(E) shows the signal output from the signal terminal SW of the first power supply IC 710
  • FIG. 8(F) shows the feedback voltage Vf1 generated by the backup power supply circuit 700
  • FIG. 8(G) shows the backup voltage Vb generated by the backup power supply circuit 700.
  • the first power supply IC 710 starts switching control operation as shown in FIG. 8(E).
  • the feedback voltage Vf2 of 16V is one example.
  • a feedback voltage Vf1 is generated as shown in FIG. 8(F).
  • the feedback voltage Vf1 is controlled to a voltage higher than the startup voltage Va, for example, 17V.
  • the backup power supply circuit 700 generates a backup voltage Vb as shown in FIG. 8(G).
  • the backup voltage Vb is, for example, 8V.
  • the contactor 2001 is turned on, and the backup power supply circuit 700 enters an operating state after a time Tb. Since power is supplied to the backup power supply circuit 700 from the high-voltage power supply 2000, even if the low voltage is not supplied from the low-voltage power supply 4000 due to some malfunction, the backup voltage Vb is supplied from the backup power supply circuit 700.
  • the gate power supply circuit 800 is started by the voltage conversion circuit 920, and the started gate power supply circuit 800 starts the backup power supply circuit 700, so that the start-up circuit that is separately provided for starting the backup power supply circuit can be omitted, thereby reducing component costs and the mounting area on the board.
  • the gate power supply circuit 800 cannot be started, and therefore the backup power supply circuit 700 cannot be started.
  • the high voltage supplied from the high-voltage power supply 2000 is converted by the voltage conversion circuit 920 to generate an operating voltage for the second power supply IC 810, and the gate power supply circuit 800 can be started using this operating voltage.
  • the backup power supply circuit 700 can be started using the start-up voltage Va (feedback voltage Vf2) output from the gate power supply circuit 800 after startup. Therefore, according to the second embodiment, it is possible to further improve the availability of the power conversion device 1000.
  • the power conversion device 1000 includes switching elements 411, 42 connected in series to upper and lower arms, a gate drive circuit 900 that drives the switching elements 411, 42, a controller 910 that operates with a predetermined low voltage supplied from a low-voltage power supply 4000 and outputs a drive signal Pw that drives the switching elements 411, 42 to the gate drive circuit 900, a gate power supply circuit 800 that generates a gate drive voltage for operating the gate drive circuit 900 and supplies the generated gate drive voltage to the gate drive circuit 900, and a backup power supply circuit 700 that controls a current supplied from a high-voltage power supply 2000 to a primary winding of an insulating transformer TB1 to generate a backup voltage Vb in place of the low voltage and supplies the generated backup voltage Vb to the controller 910, and the backup power supply circuit 700 is started by a start-up voltage Va output from the gate power supply circuit 800.
  • the present invention is not limited to the above-mentioned embodiments, and other forms that are conceivable within the scope of the technical concept of the present invention are also included within the scope of the present invention, so long as they do not impair the characteristics of the present invention.
  • the above-mentioned embodiments may be combined to form a configuration.
  • 200 voltage detector
  • 300 DC current detector
  • 400 inverter circuit
  • 410 power module
  • 412, 422 diode
  • 500 output current detector
  • 600H high voltage side of substrate
  • 600L low voltage side of substrate
  • 700 backup power supply circuit
  • 710 first power supply IC
  • 800 gate power supply circuit
  • 810 second power supply IC
  • 900, GD1, GD2, GD3 gate drive circuit
  • 910 controller
  • 1000 Power conversion device, 2000...high voltage power supply, 2001...contactor, 3000...motor, 4000...low voltage power supply
  • FE1, FE2...field effect transistor R1, R2...resistor
  • Vcc...power supply terminal SW...signal terminal
  • FB...feedback terminal Va...startup voltage, Vb...backup voltage, D0...reverse current prevention diode, R0...current limiting resistor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention porte sur un dispositif de conversion de puissance électrique (1000) comprenant des éléments de commutation (411, 421) connectés en série à titre de bras supérieurs et de bras inférieurs, un circuit d'excitation de grille (900) qui excite les éléments de commutation, un dispositif de commande (910) qui est actionné par une basse tension prédéterminée fournie par une alimentation électrique basse tension (4000) et qui délivre des signaux d'excitation pour exciter les éléments de commutation au circuit d'excitation de grille, un circuit d'alimentation électrique de grille (800) qui génère des tensions d'excitation de grille pour faire fonctionner le circuit d'excitation de grille et qui fournit les tensions d'excitation de grille générées au circuit d'excitation de grille, et un circuit d'alimentation électrique de secours (700) qui génère une tension de secours à utiliser à la place de la basse tension en commandant un courant fourni par une alimentation électrique haute tension (2000) à l'enroulement primaire d'un transformateur d'isolation et qui fournit la tension de secours générée au dispositif de commande, le circuit d'alimentation électrique de secours étant activé par une tension d'activation délivrée par le circuit d'alimentation électrique de grille.
PCT/JP2022/037731 2022-10-07 2022-10-07 Dispositif de conversion de puissance électrique WO2024075305A1 (fr)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/037731 WO2024075305A1 (fr) 2022-10-07 2022-10-07 Dispositif de conversion de puissance électrique

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015159684A (ja) * 2014-02-25 2015-09-03 アイシン・エィ・ダブリュ株式会社 回転電機制御装置
JP2021035090A (ja) * 2019-08-20 2021-03-01 アイシン・エィ・ダブリュ株式会社 インバータ制御装置
WO2021157222A1 (fr) * 2020-02-03 2021-08-12 日立Astemo株式会社 Dispositif de protection de tension et convertisseur de courant
WO2022163019A1 (fr) * 2021-01-29 2022-08-04 日立Astemo株式会社 Dispositif de conversion de puissance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015159684A (ja) * 2014-02-25 2015-09-03 アイシン・エィ・ダブリュ株式会社 回転電機制御装置
JP2021035090A (ja) * 2019-08-20 2021-03-01 アイシン・エィ・ダブリュ株式会社 インバータ制御装置
WO2021157222A1 (fr) * 2020-02-03 2021-08-12 日立Astemo株式会社 Dispositif de protection de tension et convertisseur de courant
WO2022163019A1 (fr) * 2021-01-29 2022-08-04 日立Astemo株式会社 Dispositif de conversion de puissance

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