WO2006095529A1 - Dispositif de conversion de tension, dispositif d'entrainement de moteur et procede de commande de convertisseur de tension - Google Patents

Dispositif de conversion de tension, dispositif d'entrainement de moteur et procede de commande de convertisseur de tension Download PDF

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Publication number
WO2006095529A1
WO2006095529A1 PCT/JP2006/302312 JP2006302312W WO2006095529A1 WO 2006095529 A1 WO2006095529 A1 WO 2006095529A1 JP 2006302312 W JP2006302312 W JP 2006302312W WO 2006095529 A1 WO2006095529 A1 WO 2006095529A1
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WIPO (PCT)
Prior art keywords
voltage
converter
prescribed
drive device
boost converter
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Application number
PCT/JP2006/302312
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English (en)
Inventor
Takahiko Hirasawa
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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Application filed by Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Publication of WO2006095529A1 publication Critical patent/WO2006095529A1/fr

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Classifications

    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection

Definitions

  • the present invention relates to a voltage conversion device, a motor drive device, and a method of controlling a voltage converter, and more particularly to a voltage conversion device, a motor drive device, and a method of controlling a voltage converter capable of protecting equipment connected to a low voltage side of the voltage converter against overvoltage.
  • Iapanese Patent Laying-Open No. 2004-274945 discloses a motor drive device preventing application of overvoltage to equipment connected to a primary side (a DC power supply side) of a voltage converter that performs voltage conversion when a DC power supply fails.
  • the motor drive device includes a DC power supply, a boost converter, inverters IA, IB, a DC/DC converter, a system relay, and a control unit.
  • the boost converter is connected to the DC power supply through the system relay.
  • Inverters IA, EB are connected in parallel to the boost converter, so as to drive AC motors MA, MB respectively.
  • the DC/DC converter is connected between the system relay and the boost converter.
  • the control unit controls inverters IA, IB such that AC motors MA, MB output zero output torque. Thereafter, the control unit outputs a signal instructing turn-off of the system relay to the system relay, thereby turning off the same. Then, the control unit switches control of the boost converter to voltage-down-conversion control. According to the motor drive device, application of overvoltage to the DC/DC converter connected to the primary side (the DC power supply side) of the boost converter can be prevented.
  • the control unit stops an operation of the boost converter and holds data within the control unit. Upon recovering from an abnormal state, the control unit starts the operation of the boost converter, cancels holding of the data, and starts control of the boost converter based on data newly taken in from the outside.
  • the control unit controls the boost converter during one control cycle immediately after the start of operation of the boost converter at a voltage conversion rate that has been held during the abnormal state (a boost rate or a voltage-down-conversion rate). If a voltage on a secondary side (inverter side) of the boost converter is raised as a result of regenerative operation of the motor in the abnormal state, overvoltage may be supplied from the secondary side to the primary side of the boost converter.
  • a voltage conversion rate that has been held during the abnormal state a boost rate or a voltage-down-conversion rate.
  • the abnormal state occurs while the voltage- down-conversion rate of the boost converter is set to R and the voltage on the secondary side of the boost converter is raised during the abnormal state.
  • the control unit starts control of the boost converter with the setting of the voltage-down- conversion rate to R immediately after the start of operation of the boost converter, the primary side is supplied with the voltage obtained by down-converting the raised voltage on the secondary side at voltage-down-conversion rate R. If this supplied voltage is higher than a withstand voltage of a part of equipment (such as a DC/DC converter) connected to the primary side of the boost converter, the equipment is damaged.
  • a part of equipment such as a DC/DC converter
  • Japanese Patent Laying-Open No. 2004-274945 described above discloses neither a problem of the overvoltage that could occur immediately after the start of the operation of the boost converter nor a measure to solve the problem.
  • the technique disclosed in Japanese Patent Laying-Open No. 2004-274945 described above cannot solve such a problem. Disclosure of the Invention
  • the present invention was made to solve the above-described problems, and an object of the present invention is to provide a voltage conversion device preventing overvoltage that could occur on a low- voltage side of a voltage converter when the voltage converter starts a voltage-down-converting operation from a suspended state.
  • Another object of the present invention is to provide a motor drive device preventing overvoltage that could occur on a low- voltage side of a voltage converter when the voltage converter starts a voltage-down-converting operation from a suspended state.
  • Yet another object of the present invention is to provide a method of controlling a voltage converter preventing overvoltage that could occur on a low- voltage side of a voltage converter when the voltage converter starts a voltage-down-converting operation from a suspended state.
  • a voltage conversion device includes a voltage converter down-converting a DC voltage and supplying the resultant voltage to an electric load, and a control unit outputting an instruction to suspend the voltage converter to the voltage converter when prescribed abnormality occurs and stopping issuance of the instruction when it is confirmed that the DC voltage is lower than a prescribed voltage level after the prescribed abnormality is eliminated.
  • the voltage conversion device In the voltage conversion device according to the present invention, whether the DC voltage before voltage-down-conversion (on the high-voltage side of the voltage converter) is lower than a prescribed voltage level is checked at the time of start of the voltage-down-converting operation of the voltage converter after the prescribed abnormality is eliminated. When it is confirmed that the DC voltage is lower than the prescribed voltage level, issuance of the instruction to suspend the voltage converter, that has been output to the voltage converter, is stopped. Accordingly, when the voltage converter starts the voltage-down-converting operation, a voltage equal to or higher than the prescribed voltage level is not supplied to the electric load that receives the down-converted voltage from the voltage converter.
  • the prescribed voltage level is set to an appropriate value, so that application of the overvoltage to the electric load that receives the down-converted voltage from the voltage converter can be prevented.
  • the prescribed voltage level is determined based on a withstand voltage of a part of the electric load.
  • the prescribed voltage level is determined based on the withstand voltage of the part of the electric load that receives the down- converted voltage from the voltage converter. Therefore, when the voltage converter starts the voltage-down-converting operation, a voltage equal to or higher than the withstand voltage of the part is not supplied to the electric load.
  • the voltage conversion device further includes a discharge circuit lowering the DC voltage when the DC voltage is equal to or higher than the prescribed voltage level after the prescribed abnormality is eliminated.
  • the DC voltage before voltage-down- conversion (on the high- voltage side of the voltage converter) is equal to or higher than the prescribed voltage level after prescribed abnormality is eliminated, the DC voltage before voltage-down-conversion is lowered by means of the discharge circuit.
  • the DC voltage before voltage-down-conversion can be supplied to the electric load after it is made lower than the withstand voltage of the part of the electric load that receives the down-converted voltage from the voltage converter.
  • a motor drive device includes: a DC power supply; a drive device driving a motor; a voltage converter down-converting a DC voltage from the drive device and supplying the resultant voltage to a side of the DC power supply; an electric load connected between the DC power supply and the voltage converter; and a control unit outputting an instruction to suspend the voltage converter to the voltage converter when prescribed abnormality occurs and stopping issuance of the instruction when it is confirmed that the DC voltage from the drive device is lower than a prescribed voltage level after the prescribed abnormality is eliminated.
  • the motor drive device In the motor drive device according to the present invention, whether or not the DC voltage on the high- voltage side (on a side of the drive device) of the voltage converter is lower than the prescribed voltage level is checked at the time of start of the voltage-down-converting operation of the voltage converter after the prescribed abnormality is eliminated during regenerative operation of the motor. When it is confirmed that the DC voltage is lower than the prescribed voltage level, issuance of the instruction to suspend the voltage converter that has been output to the voltage converter is stopped. Accordingly, when the voltage converter starts the voltage- down-converting operation, a voltage equal to or higher than the prescribed voltage level is not supplied to the electric load connected to the low-voltage side (the DC power supply side) of the voltage converter.
  • the prescribed voltage level is set to an appropriate value, so that application of the overvoltage to the electric load connected to the low-voltage side (the DC power supply side) of the voltage converter can be prevented.
  • the prescribed voltage level is determined based on a withstand voltage of a part of the electric load.
  • the prescribed voltage level is determined based on the withstand voltage of the part of the electric load. Therefore, when the voltage converter starts the voltage-down-converting operation, a voltage equal to or higher than the withstand voltage of the part is not supplied to the electric load connected to the low- voltage side (the DC power supply side) of the voltage converter.
  • the motor drive device application of the overvoltage equal to or higher than the withstand voltage of the part to the electric load connected to the low- voltage side (the DC power supply side) of the voltage converter can be prevented.
  • the motor drive device further includes a discharge circuit connected between the drive device and the voltage converter.
  • the DC voltage on the high- voltage side (the side of the drive device) of the voltage converter when the DC voltage on the high- voltage side (the side of the drive device) of the voltage converter is equal to or higher than the prescribed voltage level after prescribed abnormality is eliminated, the DC voltage is lowered by means of the discharge circuit. Accordingly, the DC voltage on the high- voltage side (the side of the drive device) of the voltage converter can be supplied to the electric load after it is made lower than the withstand voltage of the part of the electric load connected to the low- voltage side (a side of a power supply unit) of the voltage converter.
  • the voltage converter further attains a boost function to boost a DC voltage from the DC power supply and supplying the resultant voltage to the drive device.
  • a method of controlling a voltage converter down-converting a DC voltage and supplying the resultant voltage to an electric load includes: a first step to output an instruction to suspend the voltage converter to the voltage converter when prescribed abnormality occurs; a second step to determine whether or not the prescribed abnormality has been eliminated; a third step to determine whether or not the DC voltage is lower than a prescribed voltage level when it is determined at the second step that the prescribed abnormality has been eliminated; and a fourth step to stop issuance of the instruction when it is determined at the third step that the DC voltage is lower than the prescribed voltage level.
  • the method of controlling the voltage converter of the present invention if it is determined at the second step that the prescribed abnormality has been eliminated, whether or not the DC voltage before voltage-down-conversion (on the high-voltage side of the voltage converter) is lower than the prescribed voltage level is determined at the third step. If it is determined that the DC voltage before voltage- down-conversion is lower than the prescribed voltage level, issuance of the instruction to suspend the voltage converter that has been output to the voltage converter is stopped at the fourth step. Accordingly, when the voltage converter starts the voltage- down-converting operation, a voltage equal to or higher than the prescribed voltage level is not supplied to the electric load that receives the down-converted voltage from the voltage converter.
  • the prescribed voltage level is set to an appropriate value, so that application of the overvoltage to the electric load that receives the down-converted voltage from the voltage converter can be prevented.
  • the prescribed voltage level is determined based on a withstand voltage of a part of the electric load.
  • the prescribed voltage level is determined based on the withstand voltage of the part of the electric load that receives the down-converted voltage from the voltage converter. Therefore, when the voltage converter starts the voltage-down-converting operation, a voltage equal to or higher than the withstand voltage of the part is not supplied to the electric load. Therefore, according to the method of controlling the voltage converter, application of the overvoltage equal to or higher than the withstand voltage of the part to the electric load that receives the down-converted voltage from the voltage converter can be prevented.
  • the DC voltage before voltage-down-conversion (on the high-voltage side of the voltage converter) is referred to.
  • the prescribed voltage level such as the withstand voltage of the part of the electric load connected to the low- voltage side of the voltage converter
  • Fig. 1 is a schematic block diagram of a motor drive device according to an embodiment of the present invention.
  • Fig. 2 is a functional block diagram with regard to control of a boost converter in a control unit shown in Fig. 1.
  • Fig. 3 is a timing chart for illustrating a concept of abnormality processing by the control unit shown in Fig. 2.
  • Fig. 4 is a flowchart with regard to abnormality processing by the control unit shown in Fig. 2. Best Modes for Carrying Out the Invention
  • a motor drive device 100 includes a battery B, a boost converter 10, an inverter 20, a control unit 30, a DC/DC converter 40, an auxiliary machinery battery 50, a resistor element 60, a system relay SR, capacitors Cl, C2, voltage sensors 72, 74, 76, power supply lines PLl, PL2, and a ground line SL.
  • a motor-generator MG driven by motor drive device 100 is an AC motor and implemented, for example, by a three-phase AC synchronous motor-generator.
  • Motor- generator MG generates drive torque with a three-phase AC voltage received from inverter 20.
  • motor-generator MG generates a three-phase AC voltage in the regenerative operation, and outputs the same to inverter 20.
  • Battery B serving as the DC power supply is a battery that can be charged or discharged, and implemented, for example, by a secondary battery such as a nickel hydrogen battery, a lithium ion battery or the like. Battery B outputs the generated DC voltage to power supply line PLl . In addition, battery B is charged with the DC voltage generated by motor-generator MG and down-converted by boost converter 10 after rectification by inverter 20.
  • Boost converter 10 includes a reactor L, power transistors Ql, Q2, and diodes Dl, D2.
  • Reactor L has one end connected to power supply line PLl and the other end connected to a connection point of power transistors Ql, Q2.
  • Q2 are implemented, for example, by an IGBT (Insulated Gate Bipolar Transistor).
  • IGBT Insulated Gate Bipolar Transistor
  • Power transistors Ql, Q2 are connected in series between power supply line PL2 and ground line SL, and receive a signal PWC from control unit 30 at the base.
  • Diodes Dl, D2 are connected between the collector and the emitter of power transistors Ql, Q2 respectively, so that a current flows from the emitter side to the collector side.
  • Inverter 20 includes a U-phase arm 22, a V-phase arm 24 and a W-phase arm 26.
  • U-phase arm 22, V-phase arm 24 and W-phase arm 26 are connected in parallel between power supply line PL2 and ground line SL.
  • U-phase arm 22 includes power transistors Q3, Q4 connected in series
  • V-phase arm 24 includes power transistors Q5, Q6 connected in series
  • W-phase arm 26 includes power transistors Q7, Q8 connected in series.
  • Each of power transistors Q3 to Q8 is implemented, for example, by an
  • Diodes D3 to D8 are connected between the collector and the emitter of power transistors Q3 to Q8 respectively, so that a current flows from the emitter side to the collector side.
  • a connection point of the power transistors in the arm of each phase is connected to an end of a coil opposite to a neutral point of the coil of each phase of motor-generator MG.
  • System relay SR is connected between battery B and power supply line PLl, ground line SL, and turned on and off in response to a signal SE from control unit 30.
  • System relay SR electrically connects battery B to power supply line PLl and ground line SL when it is turned on in response to signal SE, and electrically disconnects battery B from power supply line PLl and ground line SL when it is turned off in response to the same.
  • Capacitor Cl is connected between power supply line PLl and ground line SL, and smoothes voltage fluctuation between power supply line PLl and ground line SL.
  • DC/DC converter 40 is connected between power supply line PLl and ground line SL, and down-converts the voltage from power supply line PLl and outputs the resultant voltage to auxiliary machinery battery 50.
  • Auxiliary machinery battery 50 serves as a power supply for auxiliary machinery of motor drive device 100, and supplies a voltage for auxiliary machinery (hereinafter, referred to as auxiliary machinery voltage) to control unit 30 or other not-shown auxiliary machinery.
  • Capacitor C2 is connected between power supply line PL2 and ground line SL, and smoothes voltage fluctuation between power supply line PL2 and ground line SL.
  • Resistor element 60 is connected between power supply line PL2 and ground line SL in parallel to capacitor C2. When the voltage level of power supply line PL2 is not controlled, resistor element 60 attains a function as a discharge circuit that releases charges on power supply line PL2 to ground line SL so as to down-convert the voltage of power supply line PL2.
  • Boost converter 10 boosts the DC voltage supplied from battery B through power supply line PLl and outputs the resultant voltage to power supply line PL2. More specifically, based on signal PWC from control unit 30, boost converter 10 accumulates a current that flows in accordance with a switching operation of power transistor Q2 in reactor L as magnetic energy, so as to boost the DC voltage from battery B, and outputs the boosted voltage to power supply line PL2 through diode Dl in synchronization with timing of turn-off of power transistor Q2. In addition, based on signal PWC from control unit 30, boost converter 10 down-converts the DC voltage supplied from inverter 20 through power supply line PL2 to the voltage level of battery B, and outputs the down-converted voltage to battery B and DC/DC converter 40.
  • boost converter 10 stops the switching operation of power transistors Ql, Q2 based on a signal SDOWN from control unit 30. Specifically, power transistors Ql, Q2 are turned off in response to signal SDOWN at H (logic high) level. On the other hand, while power transistors Ql, Q2 receive signal SDOWN at L (logic low) level, they perform the switching operation in response to signal PWC from control unit 30.
  • Inverter 20 converts the DC voltage supplied from power supply line PL2 to a three-phase AC voltage based on a signal PWM from control unit 30, to drive motor- generator MG. Accordingly, motor-generator MG is driven so as to generate torque designated by a torque instruction value TR. In addition, inverter 20 converts the three-phase AC voltage generated by motor-generator MG upon receiving external rotation force to the DC voltage based on signal PWM from control unit 30, and outputs the resultant DC voltage to power supply line PL2.
  • Voltage sensor 72 detects a voltage between power supply line PLl and ground line SL, that is, a voltage VL on the primary side (low-voltage side) of boost converter 10, and outputs detected voltage VL to control unit 30.
  • Voltage sensor 74 detects a voltage between power supply line PL2 and ground line SL, that is, a voltage VH on the secondary side (high- voltage side) of boost converter 10, and outputs detected voltage VH to control unit 30.
  • Voltage sensor 76 detects an auxiliary machinery voltage VA of auxiliary machinery battery 50, and outputs detected auxiliary machinery voltage VA to control unit 30.
  • Control unit 30 generates signal PWC for driving boost converter 10 based on torque instruction value TR and revolution number MRN of motor-generator MG received from the outside, voltage VL from voltage sensor 72 and voltage VH from voltage sensor 74, and outputs generated signal PWC to boost converter 10.
  • control unit 30 detects an abnormal state such as lowering in auxiliary machinery voltage VA, overvoltage of voltages VL, VH, and overheat of boost converter 10. Moreover, control unit 30 generates signal SDOWN instructing stop of the switching operation of power transistors Ql, Q2 in boost converter 10. When control unit 30 detects the abnormal state as above, control unit 30 outputs signal SDOWN at H level to boost converter 10.
  • control unit 30 generates signal PWM for driving motor-generator MG based on voltage VH from voltage sensor 74 as well as on a motor current and torque instruction value TR of motor-generator MG, and outputs generated signal PWM to inverter 20.
  • Fig. 2 is a functional block diagram with regard to control of boost converter 10 in control unit 30 shown in Fig. 1.
  • control unit 30 includes a voltage instruction operation unit 112, a duty ratio operation unit 114, a PWM signal conversion unit 1 16, and an abnormality processing unit 118.
  • Voltage instruction operation unit 112 receives torque instruction value TR and motor revolution number MRN of motor-generator MG from the outside. When motor-generator MG is driven to achieve power running, voltage instruction operation unit 112 calculates an optimal value (a target value) for voltage VH based on torque instruction value TR and motor revolution number MRN, and outputs the calculated target value for voltage VH to duty ratio operation unit 1 14.
  • voltage instruction operation unit 112 calculates an optimal value (a target value) for voltage VL based on torque instruction value TR and motor revolution number MRN, and outputs the calculated target value for voltage VL to duty ratio operation unit 114.
  • voltage instruction operation unit 112 receives a signal HOLD from abnormality processing unit 118.
  • signal HOLD is at H level
  • voltage instruction operation unit 112 no longer takes in torque instruction value TR and motor revolution number MRN from the outside, but holds values immediately before signal HOLD attains to H level.
  • Duty ratio operation unit 114 receives voltages VL, VH from voltage sensors 72, 74 respectively, and receives the target value for voltage VL or the target value for voltage VH from voltage instruction operation unit 112. Then, duty ratio operation unit 114 calculates a duty ratio for setting voltage VH to that target value while motor- generator MG is driven to achieve power running, and outputs the calculated duty ratio to PWM signal conversion unit 116.
  • duty ratio operation unit 114 calculates a duty ratio for setting voltage VL to that target value while motor-generator MG is driven to perform regenerative operation, and outputs the calculated duty ratio to PWM signal conversion unit 116.
  • duty ratio operation unit 114 receives signal HOLD from abnormality processing unit 118.
  • signal HOLD is at H level
  • duty ratio operation unit 114 no longer takes in voltages VL, VH from the outside, but holds values immediately before signal HOLD attains to H level.
  • PWM signal conversion unit 116 generates signal PWC for turning on/off power transistors Ql, Q2 of boost converter 10 based on the duty ratio received from duty ratio operation unit 114, and outputs generated signal PWC to power transistors Ql, Q2 of boost converter 10.
  • boost rate of boost converter 10 becomes greater.
  • the voltage-down-conversion rate of boost converter 10 becomes greater.
  • Abnormality processing unit 118 receives auxiliary machinery voltage VA from voltage sensor 76, receives voltages VL, VH from voltage sensors 72, 74 respectively, and receives a temperature T of boost converter 10 detected by a not-shown temperature sensor from the same.
  • abnormality processing unit 118 detects an abnormal state such as lowering in auxiliary machinery voltage VA, overvoltage of voltages VL, VH, and abnormal increase in temperature T
  • abnormality processing unit 118 sets signal SDOWN that instructs stop of the switching operation of power transistors Ql, Q2 to H level and outputs the signal to boost converter 10.
  • abnormality processing unit 118 When abnormality processing unit 118 detects the abnormal state as above, abnormality processing unit 118 outputs signal HOLD at H level prohibiting take-in of data from the outside and instructing holding of a data value to voltage instruction operation unit 112 and duty ratio operation unit 114.
  • abnormality processing unit 118 sets signal HOLD to L level. While motor-generator MG is driven to perform regenerative operation, however, abnormality processing unit 118 does not immediately set signal SDOWN to L level. Instead, abnormality processing unit 118 sets signal SDOWN to L level only after it is confirmed that voltage VH from voltage sensor 74 becomes lower than the withstand voltage of the part of DC/DC converter 40 or system relay SR.
  • abnormality processing unit 118 stops issuance of the instruction to stop the switching operation of power transistors Ql, Q2 only after it is confirmed that voltage VH on the secondary side (high- voltage side) of boost converter 10 is lower than the withstand voltage of the part of the equipment connected to the primary side (low-voltage side) of boost converter 10 (hereinafter, such equipment is also referred to as "low-voltage side equipment").
  • Fig. 3 is a timing chart for illustrating a concept of abnormality processing by control unit 30 shown in Fig. 2.
  • signal SDOWN that instructs suspension of boost converter 10 is set to H level.
  • boost converter 10 stops its operation.
  • voltage VH on the secondary side (high- voltage side) of boost converter 10 is denoted as Vl
  • the voltage-down-conversion rate of boost converter 10 is denoted as Rl.
  • Control unit 30 holds the voltage-down-conversion rate at Rl while the abnormal flag is at H level.
  • control unit 30 As control unit 30 operates in a prescribed control cycle, control unit 30 performs an operation using voltage-down-conversion rate Rl that has been held in the abnormal state, during a time period ⁇ t corresponding to one control cycle immediately after the start of operation of boost converter 10. On the other hand, voltage VH on the secondary side (high-voltage side) of boost converter 10 is raised to V2 after time t2.
  • boost converter 10 down-converts voltage VH that was once raised, at voltage-down-conversion rate Rl smaller than an actual input/output voltage ratio during time period ⁇ t from time t3 to t4. Therefore, an unexpectedly high voltage is supplied to the primary side (low-voltage side) of boost converter 10. If the supplied voltage is higher than the withstand voltage of the part of the low-voltage side equipment arranged on the primary side (low- voltage side) of boost converter 10, damage of the low- voltage side equipment is caused. In contrast, according to the embodiment of the present invention, signal
  • Fig. 4 is a flowchart with regard to abnormality processing by control unit 30 shown in Fig. 2. Referring to Fig.
  • abnormality processing unit 118 of control unit 30 determines whether or not the abnormal state such as lowering in auxiliary machinery voltage VA, overvoltage of voltages VL, VH, and abnormal increase in temperature T has occurred, based on auxiliary machinery voltage VA from voltage sensor 76, voltage VL from voltage sensor 72, voltage VH from voltage sensor 74, and temperature T of boost converter 10 (step SlO). If it is determined that no abnormality has occurred (NO at step SlO), abnormality processing unit 118 ends a series of processing.
  • abnormality processing unit 118 outputs signal SDOWN at H level to boost converter 10, so as to suspend boost converter 10 (step S20).
  • Abnormality processing unit 118 outputs signal HOLD at H level to voltage instruction operation unit 112 and duty ratio operation unit 114. Then, voltage instruction operation unit 112 and duty ratio operation unit 114 no longer take in torque instruction value TR, motor revolution number MRN and voltages VL, VH from the outside, but hold the values immediately before occurrence of the abnormality (step S30).
  • abnormality processing unit 118 determines whether or not the abnormality that had occurred has been eliminated (step S40). If abnormality processing unit 1 18 determines that the abnormality has not been eliminated (NO at step S40), the process proceeds to step S20. On the other hand, if it is determined at step S40 that the abnormality has been eliminated (YES at step S40), abnormality processing unit 1 18 sets signal HOLD to L level. Then, voltage instruction operation unit 112 starts to take in torque instruction value TR and motor revolution number MRN from the outside, and duty ratio operation unit 114 starts to take in voltages VL, VH from the outside (step S 50).
  • abnormality processing unit 118 determines whether or not voltage VH from voltage sensor 74 is lower than the withstand voltage of the part of the low- voltage side equipment connected to the primary side (low- voltage side) of boost converter 10 (step S60). If it is determined that voltage VH is not lower than the withstand voltage of the part of the low-voltage side equipment (NO at step S60), abnormality processing unit 118 waits until voltage VH becomes lower than the withstand voltage of the part of the low- voltage side equipment as a result of discharge by resistor element 60. If it is determined that voltage VH is lower than the withstand voltage of the part of the low- voltage side equipment (YES at step S60), abnormality processing unit 118 sets signal SDOWN to L level and stops issuance of the instruction to suspend boost converter 10 (step S70).
  • boost converter 10 when the voltage- down-converting operation of boost converter 10 is started after the abnormality is eliminated, voltage VH on the secondary side (high- voltage side) of boost converter 10 is referred to. After it is confirmed that voltage VH is lower than the withstand voltage of the part of the low- voltage side equipment connected to the primary side (low- voltage side) of boost converter 10, signal SDOWN is set to L level and issuance of the instruction to suspend boost converter 10 is stopped. Therefore, application of the overvoltage to DC/DC converter 40 can be prevented.
  • DC/DC converter 40 or system relay SR is connected to the primary side (low- voltage side) of boost converter 10 as the low- voltage side equipment. If an inverter for an air-conditioner or other equipment is further connected to the primary side of the boost converter, however, a withstand voltage of a part of such equipment may be taken into consideration.
  • voltages VL, VH are detected by voltage sensors 72, 74 respectively, however, voltages VL, VH may be calculated by using a current sensor and a resistor, instead of the voltage sensor.
  • battery B is employed as the secondary battery that can be charged and discharged, however, the battery may be a fuel cell.
  • the fuel cell refers to a DC power generating cell that obtains electric energy from chemical reaction energy generated by chemical reaction between a fuel such as hydrogen and an oxidizer.
  • boost converter 10 corresponds to the "voltage converter” in the present invention
  • the low-voltage side equipment corresponds to the "electric load” in the present invention
  • Boost converter 10 and control unit 30 correspond to the "voltage conversion device” in the present invention
  • battery B corresponds to the “DC power supply” in the present invention
  • inverter 20 corresponds to the "drive device” in the present invention.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

Selon l'invention, lorsqu'une anomalie se produit, une unité de commande suspend un convertisseur élévateur (S20). Lorsque l'état anormal est éliminé (OUI à S40), l'unité de commande vérifie si la tension VH d'un côté haute tension (côté inverseur) du convertisseur élévateur est inférieure ou non à une tension de résistance d'une partie d'un équipement connecté à un côté basse tension (côté batterie) du convertisseur élévateur (S60). L'unité de commande arrête l'émission d'une instruction pour suspendre le convertisseur élévateur après que la tension VH est devenue inférieure à la tension de résistance de la partie d'équipement (S70).
PCT/JP2006/302312 2005-03-04 2006-02-03 Dispositif de conversion de tension, dispositif d'entrainement de moteur et procede de commande de convertisseur de tension WO2006095529A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005061070A JP2006246653A (ja) 2005-03-04 2005-03-04 電圧変換装置、モータ駆動装置、および電圧変換器の制御方法
JP2005-061070 2005-03-04

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WO2006095529A1 true WO2006095529A1 (fr) 2006-09-14

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PCT/JP2006/302312 WO2006095529A1 (fr) 2005-03-04 2006-02-03 Dispositif de conversion de tension, dispositif d'entrainement de moteur et procede de commande de convertisseur de tension

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US8253359B2 (en) 2008-03-25 2012-08-28 Aisin Aw Co., Ltd. Electric rotating machine control system and vehicle driving system including the electric rotating machine control system
CN105429561A (zh) * 2015-12-28 2016-03-23 珠海格力电器股份有限公司 一种电机控制电路

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JP2008283840A (ja) * 2007-05-14 2008-11-20 Toyota Motor Corp 動力システムおよびその制御方法並びに車両
JP4948329B2 (ja) * 2007-08-24 2012-06-06 トヨタ自動車株式会社 モータ駆動装置およびモータ駆動装置の制御方法
JP2010279122A (ja) * 2009-05-27 2010-12-09 Sanken Electric Co Ltd スイッチング装置及びその制御方法

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US5926383A (en) * 1998-03-20 1999-07-20 Lucent Technologies Inc. Integrated protection circuit for a power converter and method of operation thereof
US20020109406A1 (en) * 2001-01-19 2002-08-15 Markus Aberle Apparatus for generating and distributing electrical power to loads in a vehicle
US20030043610A1 (en) * 2001-08-29 2003-03-06 Yoshitoshi Akita Controller of AC machine
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Publication number Priority date Publication date Assignee Title
US5926383A (en) * 1998-03-20 1999-07-20 Lucent Technologies Inc. Integrated protection circuit for a power converter and method of operation thereof
US6536207B1 (en) * 2000-03-02 2003-03-25 New Power Concepts Llc Auxiliary power unit
US20020109406A1 (en) * 2001-01-19 2002-08-15 Markus Aberle Apparatus for generating and distributing electrical power to loads in a vehicle
US20030043610A1 (en) * 2001-08-29 2003-03-06 Yoshitoshi Akita Controller of AC machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8253359B2 (en) 2008-03-25 2012-08-28 Aisin Aw Co., Ltd. Electric rotating machine control system and vehicle driving system including the electric rotating machine control system
CN105429561A (zh) * 2015-12-28 2016-03-23 珠海格力电器股份有限公司 一种电机控制电路

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