WO2019159663A1 - Dispositif de conversion de puissance, module de moteur et dispositif de direction assistée électrique - Google Patents

Dispositif de conversion de puissance, module de moteur et dispositif de direction assistée électrique Download PDF

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Publication number
WO2019159663A1
WO2019159663A1 PCT/JP2019/002669 JP2019002669W WO2019159663A1 WO 2019159663 A1 WO2019159663 A1 WO 2019159663A1 JP 2019002669 W JP2019002669 W JP 2019002669W WO 2019159663 A1 WO2019159663 A1 WO 2019159663A1
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Prior art keywords
phase
node
neutral point
inverter
circuit
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PCT/JP2019/002669
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English (en)
Japanese (ja)
Inventor
弘光 大橋
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日本電産株式会社
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Priority to JP2020500372A priority Critical patent/JPWO2019159663A1/ja
Publication of WO2019159663A1 publication Critical patent/WO2019159663A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Definitions

  • the present disclosure relates to a power conversion device, a motor module, and an electric power steering device that convert electric power from a power source into electric power supplied to an electric motor.
  • Patent document 1 is disclosing the power converter device which is provided with a control part and two inverters, and converts the electric power supplied to a three-phase motor.
  • Each of the two inverters is connected to a power source and a ground (hereinafter referred to as “GND”).
  • One inverter is connected to one end of the three-phase winding of the motor, and the other inverter is connected to the other end of the three-phase winding.
  • Each inverter includes a bridge circuit composed of three legs each including a high-side switch element and a low-side switch element.
  • Patent Document 2 discloses a motor drive device that includes four electrical separation means and two inverters and converts electric power supplied to a three-phase motor.
  • one electrical separation means is provided between the power supply and the inverter, and one electrical separation means is provided between the inverter and GND.
  • the neutral point of the winding in the failed inverter it is possible to drive the motor with a non-failed inverter.
  • the failed inverter is separated from the power supply and GND by turning off the two electrical separation means connected to the failed inverter.
  • JP 2014-192950 A Japanese Patent No. 5797751
  • Embodiments of the present disclosure provide a power conversion device capable of appropriately suppressing element damage in a circuit.
  • An exemplary power conversion device is a power conversion device that converts power from a power source into power supplied to a motor having an n-phase (n is an integer of 3 or more) winding, A first inverter connected to one end of each phase winding; a second inverter connected to the other end of each phase winding; connected to one end of each phase winding; and A first neutral point relay circuit for switching connection / disconnection between one ends of windings of a phase, the first neutral point relay circuit being connected to at least one of the power source and the ground, and windings of the respective phases
  • a second neutral point relay circuit which is connected to the other end of the wire and which switches connection / disconnection between the other ends of the windings of each phase, and is connected to at least one of the power supply and the ground
  • power that can prevent overvoltage that may occur in a circuit by securing a path for releasing a zero-phase current, and as a result, can suppress element damage in the circuit.
  • a converter, a motor module including the power converter, and an electric power steering apparatus including the motor module are provided.
  • FIG. 1 is a circuit diagram illustrating a circuit configuration of a power conversion device 100 according to an exemplary embodiment 1.
  • FIG. 2 is a circuit diagram illustrating variations of the circuit configuration of the power conversion device 100 according to the exemplary embodiment 1.
  • FIG. 3 is a circuit diagram illustrating variations of the circuit configuration of the power conversion device 100 according to the exemplary embodiment 1.
  • FIG. 4 is a circuit diagram illustrating variations of the circuit configuration of the power conversion device 100 according to the exemplary embodiment 1.
  • FIG. 5 is a circuit diagram showing variations of the circuit configuration of the power conversion device 100 according to the exemplary embodiment 1.
  • FIG. 6 is a block diagram showing a block configuration of the motor module 1000 according to the exemplary embodiment 1. As shown in FIG. FIG. FIG.
  • FIG. 7 exemplifies a current waveform (sine wave) obtained by plotting the current values flowing through the A-phase, B-phase, and C-phase windings of the motor 200 when the power converter 100 is controlled according to the three-phase energization control. It is a graph to do.
  • FIG. 8 is a diagram for explaining the on / off states of the switch elements and the neutral point relay circuit in the full H bridge circuit when the two switch elements of the A-phase leg of the first inverter 120 fail in a chained manner.
  • FIG. 9 is a diagram for explaining an on / off state of the switch element and the neutral point relay circuit in the full H bridge circuit when the two switch elements of the A-phase leg of the first inverter 120 fail in a chained manner.
  • FIG. 10 is a schematic diagram showing a typical configuration of the electric power steering apparatus 2000 according to the exemplary embodiment 2. As shown in FIG.
  • a power conversion device that converts power from a power source into power supplied to a three-phase motor having three-phase (A-phase, B-phase, and C-phase) windings A form is demonstrated.
  • a power conversion device that converts power from a power source into power supplied to an n-phase motor having an n-phase winding (n is an integer of 4 or more) such as four-phase or five-phase is also within the scope of the present disclosure. . *
  • FIG. 1 schematically shows a circuit configuration of a power conversion apparatus 100 according to the present embodiment.
  • the power conversion apparatus 100 typically includes a power cutoff circuit 110, a first inverter 120, a second inverter 130, a first neutral point relay circuit 180, a second neutral point relay circuit 190, a first rectifier element 184, and A second rectifying element 194 is provided.
  • the power conversion device 100 can convert the power from the power source 101 into the power supplied to the motor 200.
  • the first and second inverters 120 and 130 can convert DC power into three-phase AC power that is pseudo-sine waves of A phase, B phase, and C phase. *
  • the motor 200 is, for example, a three-phase AC motor.
  • the motor 200 includes an A-phase winding M1, a B-phase winding M2, and a C-phase winding M3, and is connected to a first inverter 120 and a second inverter 130. More specifically, the first inverter 120 is connected to one end of each phase winding of the motor 200, and the second inverter 130 is connected to the other end of each phase winding.
  • “connection” between components (components) mainly means electrical connection, and further includes connection between components interposing other components or elements. *
  • the first inverter 120 has terminals A_L, B_L, and C_L corresponding to each phase.
  • the second inverter 130 has terminals A_R, B_R and C_R corresponding to each phase.
  • the terminal A_L of the first inverter 120 is connected to one end of the A-phase winding M1
  • the terminal B_L is connected to one end of the B-phase winding M2
  • the terminal C_L is connected to one end of the C-phase winding M3. Connected.
  • the terminal A_R of the second inverter 130 is connected to the other end of the A-phase winding M1
  • the terminal B_R is connected to the other end of the B-phase winding M2
  • the terminal C_R is , And connected to the other end of the C-phase winding M3.
  • the power conversion apparatus 100 includes a full H bridge circuit configured by H bridges of A phase, B phase, and C phase.
  • the motor connection is different from so-called star connection and delta connection. *
  • the power cutoff circuit 110 includes first to fourth switch elements 111, 112, 113 and 114.
  • the first inverter 120 can be electrically connected to the power source 101 and GND by the power cutoff circuit 110.
  • the second inverter 130 can be electrically connected to the power source 101 and GND by the power cutoff circuit 110. More specifically, the first switch element 111 switches connection / disconnection between the first inverter 120 and GND.
  • the second switch element 112 switches connection / disconnection between the power source 101 and the first inverter 120.
  • the third switch element 113 switches connection / disconnection between the second inverter 130 and GND.
  • the fourth switch element 114 switches connection / disconnection between the power source 101 and the second inverter 130.
  • the first to fourth switch elements 111, 112, 113 and 114 can be controlled by, for example, a microcontroller or a dedicated driver.
  • the first to fourth switch elements 111, 112, 113, and 114 can block bidirectional current.
  • a semiconductor switch such as a thyristor, an analog switch IC, or a field effect transistor (typically MOSFET) in which a parasitic diode is formed, or A mechanical relay or the like can be used.
  • a combination of a diode and an insulated gate bipolar transistor (IGBT) may be used.
  • MOSFETs are illustrated as the first to fourth switch elements 111, 112, 113 and 114.
  • the first to fourth switch elements 111, 112, 113, and 114 may be referred to as SW111, 112, 113, and 114, respectively.
  • the SW 111 is disposed in the internal parasitic diode so that a forward current flows toward the first inverter 120.
  • the SW 112 is disposed in the parasitic diode so that a forward current flows toward the power supply 101.
  • the SW 113 is disposed in the parasitic diode such that a forward current flows toward the second inverter 130.
  • the SW 114 is disposed in the parasitic diode so that a forward current flows toward the power supply 101.
  • the power cutoff circuit 110 preferably further includes fifth and sixth switch elements 115 and 116 for protection against reverse connection.
  • the fifth and sixth switch elements 115 and 116 are typically MOSFET semiconductor switches having parasitic diodes.
  • the fifth switch element 115 is connected in series to the SW 112 and is arranged so that a forward current flows toward the first inverter 120 in the parasitic diode.
  • the sixth switch element 116 is connected in series to the SW 114, and is arranged so that a forward current flows toward the second inverter 130 in the parasitic diode. Even when the power supply 101 is connected in the reverse direction, the reverse current can be interrupted by the two switch elements for protecting the reverse connection. *
  • the number of switch elements to be used is not limited to the illustrated example, and is appropriately determined in consideration of design specifications and the like. Particularly in the in-vehicle field, since high quality assurance is required from the viewpoint of safety, it is preferable to provide a plurality of switching elements used for each inverter.
  • the power source 101 is, for example, a single power source common to the first and second inverters 120 and 130.
  • the power supply 101 generates a predetermined power supply voltage (for example, 12V).
  • a DC power source is used as the power source.
  • the power source may be an AC-DC converter, a DC-DC converter, or a battery (storage battery).
  • the power source 101 may include a power source for the first inverter 120 and a power source for the second inverter 130 separately. *
  • a coil 102 is provided between the power source 101 and the power cutoff circuit 110.
  • the coil 102 functions as a noise filter, and smoothes the high frequency noise included in the voltage waveform supplied to each inverter or the high frequency noise generated by each inverter so as not to flow out to the power source side.
  • a capacitor 103 is connected to the power line of each inverter.
  • the capacitor 103 is a so-called bypass capacitor and suppresses voltage ripple.
  • the capacitor 103 is, for example, an electrolytic capacitor, and the capacity and the number to be used are appropriately determined according to design specifications and the like. *
  • the first inverter 120 includes a bridge circuit having three legs. Each leg has a low side switch element and a high side switch element.
  • the A-phase leg has a low-side switch element 121L and a high-side switch element 121H.
  • the B-phase leg has a low-side switch element 122L and a high-side switch element 122H.
  • the C-phase leg includes a low side switch element 123L and a high side switch element 123H.
  • the switch element for example, an FET or IGBT can be used.
  • a MOSFET is used as a switch element will be described, and the switch element may be expressed as SW.
  • the low-side switch elements 121L, 122L, and 123L are denoted as SW121L, 122L, and 123L. *
  • the first inverter 120 includes three shunt resistors 121R, 122R, and 123R included in a current sensor 150 (see FIG. 6) that detects currents flowing through the windings of the phases A, B, and C. .
  • Current sensor 150 includes a current detection circuit (not shown) that detects a current flowing through each shunt resistor.
  • the shunt resistors 121R, 122R, and 123R are respectively connected between the three low-side switch elements included in the three legs of the first inverter 120 and GND.
  • the shunt resistor 121R is electrically connected between SW121L and SW111
  • the shunt resistor 122R is electrically connected between SW122L and SW111
  • the shunt resistor 123R is connected between SW123L and SW111. Electrically connected.
  • the resistance value of the shunt resistor is, for example, about 0.5 m ⁇ to 1.0 m ⁇ . *
  • the second inverter 130 includes a bridge circuit having three legs.
  • the A-phase leg has a low-side switch element 131L and a high-side switch element 131H.
  • the B-phase leg has a low-side switch element 132L and a high-side switch element 132H.
  • the C-phase leg has a low-side switch element 133L and a high-side switch element 133H.
  • the second inverter 130 includes three shunt resistors 131R, 132R, and 133R. Those shunt resistors are connected between three low-side switch elements included in the three legs and GND. *
  • the number of shunt resistors is not limited to three.
  • the number of shunt resistors to be used and the arrangement of the shunt resistors are appropriately determined in consideration of the product cost and design specifications.
  • the first neutral relay circuit 180 includes an A-phase first neutral relay 181, a B-phase first neutral relay 182, and a C-phase first neutral relay 183.
  • One end of each of first neutral point relays 181, 182 and 183 is connected to a common node N1, and the other end is connected to one end of each phase winding.
  • one end of the first neutral point relay 181 is connected to the node N1, and the other end is connected to a node between the SW 121H and the SW 121L in the A-phase leg of the first inverter 120.
  • One end of first neutral point relay 182 is connected to node N1, and the other end is connected to a node between SW122H and SW122L in the B-phase leg.
  • first neutral point relay 183 One end of first neutral point relay 183 is connected to node N1, and the other end is connected to a node between SW123H and SW123L in the C-phase leg.
  • first neutral relay circuit 180 can switch the connection / disconnection between the ends of the windings of each phase.
  • the first neutral point relay circuit 180 is connected to one end of the winding of each phase, and is connected to at least one of the power supply 101 and GND.
  • the first neutral point relay circuit 180 is connected to the power supply line of the power supply 101 via the first rectifier element 184 and is connected to the A phase leg, the B phase leg, and the C phase leg of the first inverter 120.
  • the second neutral point relay circuit 190 includes an A-phase second neutral point relay 191, a B-phase second neutral point relay 192, and a C-phase second neutral point relay 193.
  • One end of each of the second neutral point relays 191, 192 and 193 is connected to a common node N2, and the other end is connected to the other end of each phase winding.
  • one end of the second neutral point relay 191 is connected to the node N2, and the other end is connected to a node between the SW 131H and the SW 131L in the A-phase leg of the second inverter 130.
  • One end of second neutral point relay 192 is connected to node N2, and the other end is connected to a node between SW132H and SW132L in the B-phase leg.
  • second neutral point relay 193 One end of second neutral point relay 193 is connected to node N2, and the other end is connected to a node between SW133H and SW133L in the C-phase leg.
  • the second neutral point relay circuit 190 can switch connection / disconnection between the other ends of the windings of each phase.
  • the second neutral point relay circuit 190 is connected to the other end of the winding of each phase, and is connected to at least one of the power source 101 and GND.
  • the second neutral point relay circuit 190 is connected to the power supply line of the power supply 101 via the second rectifier element 194 and connected to the A-phase leg, B-phase leg and C-phase leg of the second inverter 130.
  • Each neutral relay in the neutral relay circuit can be controlled by, for example, a microcontroller or a dedicated driver.
  • a semiconductor switch such as a MOSFET can be used as the neutral point relay.
  • Other semiconductor switches such as thyristors and analog switch ICs or mechanical relays may be used.
  • a combination of an IGBT and a diode can be used.
  • the first rectifying element 184 is connected to the first neutral point relay circuit 180 in series or in parallel. More specifically, the first rectifying element 184 is connected in series or in parallel with each neutral point relay of the first neutral point relay circuit 180.
  • FIG. 1 shows a first rectifier element 184 connected in series to a first neutral point relay circuit 180.
  • the node N1 is connected to the power supply 101 via the first rectifying element 184.
  • the first rectifying element 184 allows a current to flow from the node N1 toward the power supply 101. *
  • the second rectifying element 194 is connected to the second neutral point relay circuit 190 in series or in parallel. More specifically, the second rectifying element 194 is connected in series or in parallel with each neutral point relay of the second neutral point relay circuit 190.
  • FIG. 1 shows a second rectifying element 194 connected in series to the second neutral point relay circuit 190.
  • the node N2 is connected to the power source 101 via the second rectifier element 194.
  • the second rectifier element 194 allows a current to flow from the node N ⁇ b> 2 toward the power supply 101.
  • a diode or a thyristor can be used as the rectifying element. *
  • each of the node N1 and the node N2 can be connected to at least one of the power supply 101 and GND.
  • 2 to 5 schematically show variations of the circuit configuration of the power conversion apparatus 100 according to the present embodiment. *
  • a first protection circuit 185 may be connected in parallel to the first rectifier element 184, and a second protection circuit 195 may be connected in parallel to the second rectifier element 194.
  • Each of the first protection circuit 185 and the second protection circuit 195 may include a resistance element, an RC circuit having a resistance element and a capacitor, or a combination thereof, or a snubber having a resistance element, a capacitor, a diode, and the like. It may be a circuit.
  • the node N ⁇ b> 1 may be connected to GND through the first rectifier element 184, and the node N ⁇ b> 2 may be connected to GND through the second rectifier element 194.
  • the first rectifying element 184 causes a current to flow from GND to the node N1
  • the second rectifying element 194 allows a current to flow from GND to the node N2.
  • each of node N1 and node N2 can be connected to power supply 101 and GND.
  • the power conversion apparatus 100 further includes a third rectifying element 186 and a fourth rectifying element 196.
  • the third rectifying element 186 is connected between the node N1 and GND
  • the fourth rectifying element 196 is connected between the node N2 and GND.
  • the third rectifying element 186 allows a current to flow from GND to the node N1
  • the fourth rectifying element 196 allows a current to flow from GND to the node N2.
  • the first rectifier element 184 is connected in parallel to each neutral point relay of the first neutral point relay circuit 180, and the second rectifier element 194 is connected to the second neutral point relay circuit 190.
  • Each neutral relay can be connected in parallel.
  • FIG. 5 shows a configuration corresponding to FIG.
  • the node N1 is connected to GND, and the neutral current relay is connected in parallel to each neutral point relay so that the forward current flows to the first inverter 120 in the first rectifying element 184. Also good. *
  • the second inverter 130 has substantially the same structure as that of the first inverter 120, and the second neutral point relay circuit 190 is substantially the same as the structure of the first neutral point relay circuit 180.
  • the inverter on the left side of the drawing is represented as a first inverter 120
  • the inverter on the right side is represented as a second inverter 130.
  • the first and second inverters 120 and 130 can be used as components of the power conversion device 100 without distinction.
  • FIG. 6 schematically shows a block configuration of the motor module 1000 according to the present embodiment.
  • the motor module 1000 includes a power conversion device 100, a motor 200, and a motor control device 300. *
  • the motor module 1000 is modularized and can be manufactured and sold as, for example, an electromechanically integrated motor having a motor, a sensor, a driver, and a controller. Further, a unit other than the motor 200 configured by the power conversion device 100 and the motor control device 300 can be modularized and manufactured and sold. *
  • the motor control device 300 includes, for example, a power supply circuit 310, an angle sensor 320, an input circuit 330, a controller 340, a drive circuit 350, and a ROM 360.
  • the motor control device 300 is a control circuit that is connected to the power conversion device 100 and drives the motor 200 by controlling the power conversion device 100.
  • the motor control device 300 can realize closed loop control by controlling the position, rotational speed, current, and the like of the rotor of the target motor 200. Note that the motor control device 300 may include a torque sensor instead of the angle sensor 320. In this case, the motor control device 300 can control the target motor torque. *
  • the power supply circuit 310 generates a DC voltage (for example, 3V, 5V) necessary for each block in the circuit. *
  • the angle sensor 320 is, for example, a resolver or a Hall IC. Alternatively, the angle sensor 320 is also realized by a combination of an MR sensor having a magnetoresistive (MR) element and a sensor magnet. The angle sensor 320 detects the rotation angle of the rotor (hereinafter referred to as “rotation signal”) and outputs the rotation signal to the controller 340.
  • rotation signal the rotation angle of the rotor
  • the input circuit 330 receives the motor current value detected by the current sensor 150 (hereinafter referred to as “actual current value”), and converts the level of the actual current value to the input level of the controller 340 as necessary.
  • the actual current value is output to the controller 340.
  • the input circuit 330 is, for example, an analog / digital conversion circuit. *
  • the controller 340 is an integrated circuit that controls the drive circuit 350, and is, for example, a microcontroller or an FPGA (Field Programmable Gate Array). *
  • the controller 340 controls the switching operation (turn-on or turn-off) of each SW in the first and second inverters 120 and 130 of the power conversion device 100.
  • the controller 340 sets the target current value according to the actual current value and the rotation signal of the rotor, generates a PWM signal, and outputs it to the drive circuit 350.
  • the controller 340 may control ON / OFF of each SW in the power shut-off circuit 110 of the power conversion device 100.
  • the controller 340 can switch on / off states of the first neutral point relay circuit 180 and the second neutral point relay circuit 190.
  • the drive circuit 350 may switch the on / off state of each neutral point relay circuit under the control of the controller 340.
  • the first neutral point relay circuit 180 may be controlled by the controller 340
  • the second neutral point relay circuit 190 may be controlled by another controller different from the controller 340. *
  • the on / off state of the neutral point relay circuit is defined.
  • Turning on the neutral point relay circuit means turning on all neutral point relays in the circuit
  • turning off the neutral point relay circuit means turning off all neutral point relays in the circuit.
  • an off state of the first neutral point relay circuit 180 means that all of the first neutral point relays 181, 182 and 183 are in an off state
  • an on state means that all of the neutral point relays thereof are in an off state. It means that it is on.
  • the first neutral relay circuit 180 is turned on, one end of each phase winding is connected, and when the first neutral relay circuit 180 is turned off, one end of each phase winding is disconnected.
  • the second neutral point relay circuit 190 is turned on, the other ends of the windings of each phase are connected.
  • When the second neutral point relay circuit 190 is turned off the other ends of the windings of each phase are not connected. Become. *
  • the drive circuit 350 is typically a gate driver (or pre-driver).
  • the drive circuit 350 generates a control signal (gate control signal) for controlling the switching operation of the MOSFET of each SW in the first and second inverters 120 and 130 according to the PWM signal, and gives the control signal to the gate of each SW.
  • the drive circuit 350 may generate a control signal for controlling on / off of each SW in the power cutoff circuit 110 in accordance with an instruction from the controller 340.
  • the gate driver may not be necessarily required. In that case, the function of the gate driver may be implemented in the controller 340. *
  • the ROM 360 is electrically connected to controller 340.
  • the ROM 360 is, for example, a writable memory (for example, PROM), a rewritable memory (for example, flash memory), or a read-only memory.
  • the ROM 360 stores a control program including a command group for causing the controller 340 to control the motor control device 300.
  • the control program is temporarily expanded in a RAM (not shown) at the time of booting. *
  • the motor control device 300 turns on all the SWs 111, 112, 113 and 114 of the power cutoff circuit 110. As a result, the power source 101 and the first inverter 120 are electrically connected, and the power source 101 and the second inverter 130 are electrically connected. The first inverter 120 and GND are electrically connected, and the second inverter 130 and GND are electrically connected. Further, motor control device 300 turns off first neutral point relay circuit 180 and second neutral point relay circuit 190.
  • the motor control device 300 drives the motor 200 by energizing the windings M1, M2, and M3 using both the first and second inverters 120 and 130.
  • energization of a three-phase winding is referred to as “three-phase energization control”.
  • FIG. 7 exemplifies a current waveform (sine wave) obtained by plotting the current values flowing through the A-phase, B-phase, and C-phase windings of the motor 200 when the power conversion device 100 is controlled according to the three-phase energization control. doing.
  • the horizontal axis represents the motor electrical angle (deg), and the vertical axis represents the current value (A).
  • current values are plotted for every electrical angle of 30 °.
  • Ipk represents the maximum current value (peak current value) of each phase.
  • the sum of the currents flowing through the three-phase windings in consideration of the current direction is “0” for each electrical angle.
  • the motor control device 300 can control the switching operation of each SW of the first and second inverters 120 and 130 by PWM control that obtains the current waveform shown in FIG. *
  • the abnormality mainly means that a failure has occurred in the switch element (FET).
  • the failure of the FET is roughly classified into “open failure” and “short failure”.
  • Open failure refers to a failure in which the source and drain of the FET are opened (in other words, the resistance rds between the source and drain becomes high impedance)
  • short failure refers to the failure between the source and drain of the FET.
  • the open failure of the switch element SW refers to a failure in which the SW is always in an off (cutoff) state and does not enter an on (conduction) state.
  • the short failure of the switch element SW indicates a failure in which the SW is always in an on state and does not enter an off state.
  • a failure occurs during the operation of the power conversion device 100, it is generally considered that a random failure in which one FET randomly fails among the 16 FETs. However, it is assumed that a chain failure in which a plurality of FETs fail in a chain manner also occurs.
  • a chain failure means, for example, that a failure occurs simultaneously in a high-side switch element and a low-side switch element of one leg. The present disclosure covers these failures.
  • the drive circuit 350 monitors the SW drain-source voltage Vds, and compares the predetermined threshold voltage with Vds to detect SW failure.
  • the threshold voltage is set in the drive circuit 350 by, for example, data communication with an external IC (not shown) and external components.
  • the drive circuit 350 is connected to a port of the controller 340 and notifies the controller 340 of a failure detection signal. For example, when the drive circuit 350 detects a failure of the SW, the drive circuit 350 asserts a failure detection signal. When the controller 340 receives the asserted failure detection signal, the controller 340 reads the internal data of the drive circuit 350 and determines which SW among the plurality of SWs has failed. *
  • the controller 340 can also detect SW failure based on the difference between the actual current value of the motor and the target current value.
  • failure detection is not limited to these methods, and known methods relating to failure detection can be widely used. *
  • the controller 340 switches the control of the power conversion apparatus 100 from normal control to abnormal control.
  • the timing for switching control from normal to abnormal is about 10 msec to 30 msec after the failure detection signal is asserted.
  • FIG. 8 and FIG. 9 show the ON / OFF state of the switch element and the neutral point relay circuit in the full H bridge circuit when the two switch elements of the A-phase leg of the first inverter 120 fail in cascade. Yes. *
  • first neutral point relay circuit 180 is not connected to the power source 101 or GND via the first rectifying element 184, unlike the present embodiment.
  • the motor control device 300 switches the motor control from the normal control to the abnormal control, and then turns on the first neutral relay circuit 180 and turns off the SWs 111 and 112 of the power shut-off circuit 110.
  • the second neutral point relay circuit 190 remains off.
  • first inverter 120 is electrically isolated from power supply 101 and GND, and node N1 of first neutral point relay circuit 180 can function as a neutral point of motor 200. In other words, the connection of the motor 200 can be switched to the Y connection.
  • the first rectifying element 184 is connected between the power source 101 and the first neutral point relay circuit 180. Therefore, even if the SWs 111 and 112 are turned off, the node N1 is not insulated from the power supply 101 or GND.
  • the first rectifying element 184 ensures a zero-phase current path. As shown in FIG. 8, when the zero-phase current Iz is a positive value, a forward current flows through the first rectifier element 184. For example, as shown in FIG. 9, when the node N1 is connected to the GND via the first rectifier element 184, when the zero-phase current Iz is a negative value, a forward current flows in the first rectifier element 184. It can flow.
  • the motor control device 300 After the first neutral point relay circuit 180 is turned on, the motor control device 300 turns off the SWs 111 and 112 of the power shut-off circuit 110 when the zero-phase current escapes to the outside through the first rectifying element 184 and becomes small. It is preferable to perform control. For example, the motor control device 300 first turns on the first neutral point relay circuit 180. It is preferable that the motor control device 300 turns off the SWs 111 and 112 after monitoring the zero-phase current and confirming that the current falls below a predetermined value. This control makes it possible to more reliably prevent the SWs 111 and 112 and the switch elements in the inverter from being damaged. *
  • the motor control device 300 switches the motor control from normal control to abnormal control, and then turns on the first neutral relay circuit 180 and switches SW111 and 112 of the power shut-off circuit 110. Turn off. For example, the motor control device 300 turns off all the SWs 122H, 122L, 123H, and 123L that have not failed in the first inverter 120. In this state, the motor control device 300 controls the switching operation of each switch element of the second inverter 130 by, for example, PWM control that obtains the current waveform shown in FIG. Thus, the motor control device 300 can quickly switch to the drive mode of the Y-connection motor after the failure of the switch element, and can continue to drive the motor 200. *
  • FIG. 10 schematically shows a typical configuration of the electric power steering apparatus 2000 according to the present embodiment.
  • a vehicle such as an automobile generally has an electric power steering device.
  • the electric power steering apparatus 2000 includes a steering system 520 and an auxiliary torque mechanism 540 that generates auxiliary torque.
  • the electric power steering apparatus 2000 generates auxiliary torque that assists the steering torque of the steering system that is generated when the driver operates the steering wheel. The burden of operation by the driver is reduced by the auxiliary torque.
  • the steering system 520 includes, for example, a steering handle 521, a steering shaft 522, universal shaft joints 523A and 523B, a rotating shaft 524, a rack and pinion mechanism 525, a rack shaft 526, left and right ball joints 552A and 552B, tie rods 527A and 527B, and a knuckle. 528A and 528B, and left and right steering wheels 529A and 529B. *
  • the auxiliary torque mechanism 540 includes, for example, a steering torque sensor 541, an automotive electronic control unit (ECU) 542, a motor 543, and a speed reduction mechanism 544.
  • the steering torque sensor 541 detects the steering torque in the steering system 520.
  • the ECU 542 generates a drive signal based on the detection signal of the steering torque sensor 541.
  • the motor 543 generates an auxiliary torque corresponding to the steering torque based on the drive signal.
  • the motor 543 transmits the generated auxiliary torque to the steering system 520 via the speed reduction mechanism 544. *
  • the ECU 542 includes, for example, the controller 340 and the drive circuit 350 according to the first embodiment.
  • an electronic control system with an ECU as a core is constructed.
  • a motor drive unit is constructed by the ECU 542, the motor 543, and the inverter 545.
  • the motor module 1000 according to Embodiment 1 can be suitably used for the unit.
  • Embodiments of the present disclosure can be widely used in various devices including various motors such as a vacuum cleaner, a dryer, a ceiling fan, a washing machine, a refrigerator, and an electric power steering device.
  • various motors such as a vacuum cleaner, a dryer, a ceiling fan, a washing machine, a refrigerator, and an electric power steering device.
  • Power conversion device 101 Power supply 102: Coil 103: Capacitor 110: Power supply switching circuit 111: First switch element (SW) 112: Second switch element (SW) 113: Third switch element (SW) 114: Fourth Switch element (SW) 115: Fifth switch element 116: Sixth switch element 120: First inverter 130: Second inverter 150: Current sensor 180: First neutral relay circuit 184: First rectifier element 190: Second Neutral relay circuit 195: second rectifier element 200: electric motor 300: motor control device 310: power supply circuit 320: angle sensor 330: input circuit 340: microcontroller 350: drive circuit 360: R M1000: Motor Module 2000: electric power steering system

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Inverter Devices (AREA)
  • Power Steering Mechanism (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention concerne un dispositif de conversion de puissance (100) qui est équipé : d'un premier onduleur (120) qui est raccordé à une extrémité de chaque enroulement de phase d'un moteur ; d'un second onduleur (130) qui est raccordé à l'autre extrémité de chaque enroulement de phase ; d'un premier circuit de relais de point neutre (180) qui est raccordé aux extrémités des enroulements de phase, commute entre une connexion et une déconnexion des extrémités des enroulements de phase, et est raccordé à une source d'alimentation et/ou à la masse ; d'un second circuit de relais de point neutre (190) qui est raccordé aux autres extrémités des enroulements de phase, commute entre une connexion et une déconnexion des autres extrémités des enroulements de phase et est raccordé à la source d'alimentation et/ou à la masse ; d'un premier élément de redressement (184) qui est raccordé en série ou en parallèle au premier circuit de relais de point neutre ; et d'un second élément de redressement (194) qui est raccordé en série ou en parallèle au second circuit de relais de point neutre.
PCT/JP2019/002669 2018-02-13 2019-01-28 Dispositif de conversion de puissance, module de moteur et dispositif de direction assistée électrique WO2019159663A1 (fr)

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Cited By (1)

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TWI695573B (zh) * 2019-10-02 2020-06-01 群光電能科技股份有限公司 電源轉換裝置

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JP2013529055A (ja) * 2010-06-14 2013-07-11 イスパノ・シユイザ 電圧インバータおよびそのようなインバータの制御方法
WO2017150640A1 (fr) * 2016-03-04 2017-09-08 日本電産株式会社 Dispositif de conversion d'énergie, unité d'entraînement de moteur et dispositif d'orientation de puissance électrique
WO2018135248A1 (fr) * 2017-01-20 2018-07-26 日本電産株式会社 Dispositif de conversion de courant, unité d'entraînement de moteur, et dispositif de direction assistée électrique

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JP6874758B2 (ja) * 2016-03-04 2021-05-19 日本電産株式会社 電力変換装置、モータ駆動ユニット、電動パワーステアリング装置およびリレーモジュール

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JP2013529055A (ja) * 2010-06-14 2013-07-11 イスパノ・シユイザ 電圧インバータおよびそのようなインバータの制御方法
WO2017150640A1 (fr) * 2016-03-04 2017-09-08 日本電産株式会社 Dispositif de conversion d'énergie, unité d'entraînement de moteur et dispositif d'orientation de puissance électrique
WO2018135248A1 (fr) * 2017-01-20 2018-07-26 日本電産株式会社 Dispositif de conversion de courant, unité d'entraînement de moteur, et dispositif de direction assistée électrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI695573B (zh) * 2019-10-02 2020-06-01 群光電能科技股份有限公司 電源轉換裝置
US10833604B1 (en) 2019-10-02 2020-11-10 Chicony Power Technology Co., Ltd. Power converter device

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