WO2013094330A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

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Publication number
WO2013094330A1
WO2013094330A1 PCT/JP2012/079056 JP2012079056W WO2013094330A1 WO 2013094330 A1 WO2013094330 A1 WO 2013094330A1 JP 2012079056 W JP2012079056 W JP 2012079056W WO 2013094330 A1 WO2013094330 A1 WO 2013094330A1
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WIPO (PCT)
Prior art keywords
phase
ground fault
output
voltage
buffer
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Application number
PCT/JP2012/079056
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English (en)
Japanese (ja)
Inventor
敬史 小倉
哲 重田
浩明 五十嵐
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日立オートモティブシステムズ株式会社
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Publication of WO2013094330A1 publication Critical patent/WO2013094330A1/fr

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    • 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
    • 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
    • H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current
    • 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 invention relates to a power converter using a semiconductor switching element, and more particularly to a power converter provided with a novel AC current ground fault detector for detecting a ground fault phenomenon.
  • a power conversion device that performs power conversion by an inverter circuit including a semiconductor switching element and supplies the power to a load such as a three-phase induction motor
  • various abnormality detection devices are provided.
  • an overcurrent detection device, an overvoltage detection device, a ground fault detection device, and the like are typical ones.
  • the present invention is directed to a ground fault detection device for detecting an AC current ground fault phenomenon (hereinafter simply referred to as a ground fault phenomenon), and generally between an inverter circuit unit and a three-phase induction motor.
  • the signal of the current sensor for detecting the flowing alternating current is sampled by a microcomputer at a predetermined cycle, and the change degree is monitored to detect the ground fault phenomenon.
  • each phase on the secondary side of the three-phase induction motor is disclosed. It is known to detect the ground fault phenomenon by connecting a resistor to the star and detecting the current or voltage at this neutral point.
  • the detection of the ground fault phenomenon of the conventional alternating current was performed by the software processing of the microcomputer based on the information of the current sensor.
  • a situation in which the ground fault phenomenon cannot be detected occurs depending on the abnormality of the microcomputer and the sampling timing for reading the information of the current sensor.
  • the operation time from the occurrence of the ground fault phenomenon to the protection operation by the protection circuit depends on the processing speed of the microcomputer and the start cycle of the processing task, there are situations where the protection operation against the ground fault phenomenon is not in time. There are concerns about the occurrence.
  • An object of the present invention is to provide a power conversion device including a ground fault detection device that can reliably detect the occurrence of a ground fault phenomenon of an alternating current and does not require a high breakdown voltage.
  • the feature of the present invention is that the output part of the current sensor that detects the current value of the alternating current flowing through the U-phase, V-phase, and W-phase output lines connecting the inverter circuit and the load is connected to a star-connected resistive load.
  • the ground fault is detected by inputting the neutral point output of the resistive load connected in a star to the decision unit, and the operation of the gate drive circuit that drives the inverter circuit is limited by the protection circuit by detecting this ground fault. It is a thing.
  • the output portion of each of the U-phase, V-phase, and W-phase current sensors is connected to a star-connected resistance load, and the neutral point output of the star-connected resistance load is input to the determination device. Therefore, it is possible to reliably cause a ground fault phenomenon, and since a current is supplied from a current sensor to a resistive load, it can be configured as a weak electric circuit, so that it is not necessary to consider the countermeasure for high breakdown voltage in the ground fault detection device. is there.
  • FIG. 1 shows a circuit diagram of a three-phase induction motor drive device for a hybrid vehicle as an example of a power conversion device.
  • the three-phase induction motor drive device for a hybrid vehicle includes a DC power supply 101, a smoothing capacitor 102, an inverter circuit.
  • a smoothing capacitor 102 is connected in parallel with the DC power source 101, and the gate drive unit 106 switches the inverter circuit unit 103 according to a control signal of the motor drive control unit 105 to convert the DC voltage into an AC voltage. Drive control of the three-phase induction motor 104 is performed.
  • the motor drive control unit 105 is interposed between at least the motor control microcomputer 110 and the motor control microcomputer 110 and the gate drive unit 106 that drives the inverter circuit unit 103, and restricts the operation of the gate drive unit 106.
  • the protection logic circuit 108 and the ground fault detection unit 109 are provided.
  • the ground fault detection unit 109 receives an output from a current sensor 107 provided on an output line 111 that supplies an AC output from the inverter circuit unit 103 to the three-phase induction motor 104.
  • the output of the current sensor 107 is also input to the motor control microcomputer 110 and used for phase angle control of the inverter circuit unit 103 and the like.
  • the current sensor 107 does not directly measure the current flowing through the output line 111, but converts the magnetic field generated in proportion to the current into a weak electric system voltage by the Hall element to indirectly detect the current.
  • the current sensor 107 is a voltage output and is used by the motor control microcomputer 110.
  • the output of the current sensor 107 can be directly input to the motor control microcomputer 110.
  • the output of the current sensor 107 is taken in at a predetermined sample timing by the motor control microcomputer 110 and is used after being A / D converted.
  • Current sensors 107 are provided in accordance with the number of output lines 111. Actually, since the output line 111 has U-phase, V-phase, and W-phase, the current sensor 107 also supplies U-phase, V-phase, and W-phase current. Three are provided to detect.
  • the U-phase, V-phase, and W-phase currents are supplied to the star-connected resistance loads 112, 113, 114 of the ground fault detection unit 109. That is, the U-phase current is supplied to the resistance load 112, the V-phase current is supplied to the resistance load 113, and the W-phase current is supplied to the resistance load 114.
  • each resistance load 112, 113, 114 is set to the same resistance value.
  • the output of the neutral point 115 of the resistance load that is star-connected is input to the determiner 116, and the ground fault phenomenon is determined.
  • a voltage is used for the output of the neutral point 115, but it may be converted into a current and used. In the following description, the voltage at the neutral point 115 is used.
  • the inverter circuit unit 103 receives a DC voltage from the DC power source 101, performs PWM (pulse modulation: Pulse Width Modulation) control according to a signal from the motor drive control unit 105, and converts the DC voltage into an arbitrary three-phase AC. Have.
  • PWM pulse modulation: Pulse Width Modulation
  • This inverter circuit unit 103 is configured by switching elements 3a to 3f made of semiconductors by a three-phase full bridge connection.
  • switching element of this embodiment an element on which an IGBT and a reflux diode are mounted is used.
  • the current of each phase of the U phase, V phase and W phase flowing between the inverter circuit unit 103 and the three-phase induction motor 104 is converted into a voltage used in the weak electric system by the current sensor 107, and the motor drive control unit 105 It is input to the motor control microcomputer 110 and also input to the ground fault detection unit 109.
  • the ground fault detection unit 109 is driven by a 5 V power source.
  • the neutral point 115 of the star connection is obtained.
  • the neutral point potential is normally stabilized at a predetermined constant value.
  • the current sensor 107 is a current-voltage conversion ratio of 500 A / V
  • the current measurement range is -1000 A to +1000 A
  • the output voltage is ⁇ 2 V centered on 2.5 V
  • the neutral point potential is about 2.5 V It stabilizes at.
  • the resistance values of the resistance loads 112, 113, and 114 are set to 10 k ⁇ in consideration of the power supply short circuit failure of the output of the current sensor 107. Then, this neutral point 115 is connected to an upper threshold value determiner 201 and a lower threshold value determiner 202 that constitute the determiner 16 as shown in FIG.
  • the + side input terminal voltage of the comparator 203 constituting the upper threshold value judgment unit 201 is determined by the voltage dividing resistance of the resistor 203 and the resistor 204. For example, if the resistor 203 is 2 k ⁇ and the resistor 204 is 3 k ⁇ , the + side input terminal voltage of the comparator 205 is 3V. This + side input terminal voltage is a comparison reference voltage and also serves as an upper threshold.
  • the potential of the neutral point 115 is stable at about 2.5V. For this reason, since the neutral point potential is lower than 3V which is the + side input terminal voltage, the output of the comparator 205 becomes high impedance, 5V is input to the transistor 206 at the final stage, and the ground fault detection signal becomes OFF. Not output.
  • the output is inverted to the low level because it is higher than 3V which is the + side input terminal voltage of the comparator 205. . Therefore, the transistor 206 at the final stage is turned on and a 5V ground fault detection signal is output.
  • the + side input terminal voltage of the comparator 205 changes depending on the resistance values of the resistors 204 and 207, the forward voltage drop of the diode 208, and the low level output voltage of the comparator 205. To do. For example, if the resistance 207 is 13 k ⁇ , the forward voltage drop of the diode 208 is 0.5 V, and the low level output voltage of the comparator 205 is 0.2 V, the + side input terminal voltage is about 2.8 V. As a result, hysteresis can be given to the + side input terminal voltage, and chattering can be prevented even if the potential of the neutral point 115 fluctuates.
  • the negative side input terminal voltage of the comparator 209 constituting the lower threshold value judgment unit 202 is determined by the voltage dividing resistance of the resistor 210 and the resistor 211. For example, if the resistor 2106 is 3 k ⁇ and the resistor 211 is 2 k ⁇ , the negative input terminal voltage of the comparator 209 is 2V.
  • the negative side input terminal voltage is a comparison reference voltage and is a lower threshold value.
  • the potential at the neutral point 115 is stable at about 2.5 V, and thus becomes higher than the negative input terminal voltage of 2 V, and the output of the comparator 209 is high. Impedance.
  • the output of the comparator 209 is high impedance, the transistor 206 at the final stage is turned off and no ground fault detection signal is output.
  • the negative side input terminal voltage of the comparator 209 of the lower threshold determination unit 202 is determined by the resistance values of the resistors 211 and 212 and the collector-emitter voltage Vce of the transistor 213. .
  • the resistor 212 is 13 k ⁇ and Vce is 0.3 V
  • the negative input terminal voltage is about 2.2 V.
  • the resistors connected to the transistors 206 and 213 are adjustment resistors.
  • the resistance of the star-connected resistance load can be reduced.
  • Each threshold can be provided with hysteresis without changing the potential of the neutral point 115.
  • the current of each phase of the U phase, V phase and W phase is detected by a current sensor, and the voltage at the neutral point is detected by applying a voltage proportional to the current of each phase to the star-connected resistance load.
  • a determination device preferably a comparator having an upper threshold value and a lower threshold value, it becomes possible to always detect a ground fault state, and to connect the inverter circuit unit and the three-phase induction motor.
  • the current flowing in the output line to be connected is converted to a voltage that can be used in a weak electric system and applied to a star-connected resistive load, and the neutral point potential obtained by this is determined by a determiner.
  • FIG. 3 shows an embodiment of the protection logic circuit 108 provided in the motor drive control unit 105 when the protection operation of the three-phase open control is performed when the ground fault phenomenon is detected.
  • FIG. 4 shows an embodiment of the protection logic circuit 108 provided in the motor drive control unit 105 when the protection operation of the three-phase short control is performed when a ground fault is detected.
  • the inverter circuit unit 103 is normally controlled by a motor control microcomputer 110 provided in the motor drive control unit 105.
  • the motor control microcomputer 110 functions to perform PWM control by calculating an appropriate switching time of the semiconductor switching element of the inverter circuit unit 103 in order to give an arbitrary torque and rotation speed to the three-phase induction motor.
  • the first buffer 301 and the second buffer 303 constituting the protection logic circuit 108, and the first buffer 301 arranged between them.
  • Three buffers 302a and a fourth buffer 302b are provided.
  • buffers 301, 302 a, 302 b, and 303 function as a blocking function unit that transmits a control signal from the motor control microcomputer 110 to the gate drive unit 106 and blocks transmission of the control signal in the event of an abnormality.
  • Buffers 301 and 303 are provided on all the switching control signal lines of the semiconductor switching elements 3a to 3f constituting the upper and lower arms.
  • the buffer 302a is provided on the switching control signal line of the semiconductor switching elements 3a, 3b, and 3c constituting the upper arm
  • the buffer 302b is on the switching control signal line of the semiconductor switching elements 3d, 3e, and 3f constituting the lower arm. Is provided.
  • Switching control signals for controlling the semiconductor switching elements 3a to 3f output from the motor control microcomputer 110 are input to the gate driving unit 106 through these buffers 301, 302a, 302b, and 303.
  • Buffers 301, 302a, 302b, and 303 are three-state buffers, and a three-phase open signal, a three-phase short signal, or the like is input as a control signal (hereinafter referred to as a trigger signal) that changes the state of each buffer.
  • the trigger signal is not input, and the buffers 301, 302a, 302b, and 303 are in a conductive state, and each semiconductor switching output from the motor control microcomputer 110 is performed.
  • a switching control signal for controlling the elements 3a to 3f passes through the buffers 301, 302a, 302b, and 303 and is output as it is and is transmitted to the gate drive circuit 106.
  • each of the buffers 301, 302a, 302b, and 303 is inverted to a cutoff state (high impedance state).
  • the buffer 301 is cut off, the output side of the buffer 301 (that is, the input side of the buffers 302a and 302b) is pulled up to the high state.
  • the output side of the buffers 302a and 302b (that is, the input side of the buffer 303) is pulled down to the low state.
  • the output side of the buffer 303 that is, the input side of the gate driving unit 109
  • the photocoupler in the gate driving unit 106 becomes non-conductive, so that the switching elements 3a to 3f It becomes OFF.
  • the gate driving unit 106 When the Low signal is input, the gate driving unit 106 turns on the semiconductor switching element (conducting state), and conversely, when the High signal is input, the gate driving unit 106 turns off the semiconductor switching element.
  • Gate operation by performing an open operation or a 3-phase short (upper arm 3-phase short, lower arm 3-phase short) operation in which only the upper arms 3a to 3c or the lower arms (3d to 3f) are turned on and the others are turned off The operation of the drive unit 106 is limited.
  • the three-phase open operation is executed by a three-phase open signal such as the ground fault detection signal 306, the overcurrent detection signal 307, or the overvoltage detection signal 308 detected in the embodiment shown in FIG.
  • the trigger signal for the open operation is input to the buffer 301 via the timer circuit 305.
  • the buffer 301 When the trigger signal is input to the buffer 301 via the timer circuit 305, the buffer 301 is cut off as described above, and the output side of the buffer 301 is in a high state.
  • the buffer 301 is cut off and the buffers 302a, 302b, and 303 are in a conductive state, so that a high signal is input to the gate driving unit 106 for all the semiconductor switching elements 3a to 3f of the upper and lower arms.
  • the semiconductor switching element when a high signal is input to the gate driving unit 106, the semiconductor switching element is turned off (shut off), and when a low signal is input, the semiconductor switching element is turned on (conductive state).
  • a trigger signal 309 for performing either or both of the upper arm three-phase short operation and the lower arm three-phase short operation can be output from a host microcomputer such as a unit, and the overvoltage detection signal 308 and the ground fault detection signal in FIG.
  • Reference numeral 306 denotes a trigger signal for performing a lower arm three-phase short operation.
  • the buffer 301 receives a trigger signal 309 from the host microcomputer, and the buffers 302a and 302b have a trigger signal 309, an overvoltage signal 308, A ground fault signal 306 is input.
  • the timing chart in the case of the upper arm three-phase short circuit is the same as that in the case of the lower arm three-phase short circuit shown in FIG.
  • a three-phase short signal (lower arm three-phase short) from a host microcomputer or the like is input to a buffer 301 and a three-phase short drive signal control logic 304.
  • the output of the buffer 301 is cut off, and as a result, the input side of the buffer 302a and the buffer 302b provided in the subsequent stage of the buffer 301 is pulled up to a high state.
  • the semiconductor switching element when the low signal is input to the gate driving unit 106, the semiconductor switching element is turned on, and when the high signal is input, the semiconductor switching element is turned off.
  • the input side of the buffers 302a and 302b (the output side of the buffer 301) is in a high state. Since the High signal passes through the buffer 303 and is directly input to the gate driving unit 109, the semiconductor switching elements 3a to 3f are turned off. This produces an output as shown in “Output Buffer 301” in FIG.
  • the three-phase short drive signal control logic 304 when a three-phase short signal is input to the three-phase short drive signal control logic 304, the three-phase short drive signal control logic 304 performs a delay operation and is delayed by a predetermined delay time ⁇ t1 from the output cutoff of the buffer 301.
  • the upper arm 3-phase short signal in the case of an upper arm 3-phase short operation
  • the lower arm 3-phase short signal in the case of a lower arm 3-phase short operation
  • FIG. 5 shows the case of a three-phase short in the lower arm, so the output of the buffer 302b is delayed by a predetermined delay time ⁇ t1 from the output cut off of the buffer 301. Blocked.
  • the semiconductor switching elements 3d to 3f when entering the three-phase short operation, first, the three-phase open operation for turning off all the semiconductor switching elements 3a to 3f is performed, and then the semiconductor switching elements 3a to 3c are performed. Alternatively, the semiconductor switching elements 3d to 3f are turned on. (In FIG. 5, the semiconductor switching elements 3d to 3f operate so as to be turned on.) When the three-phase short signal disappears, as shown in “buffer 302b output” in FIG. 5, the buffer 302b (buffer 302a in the case of the upper-arm three-phase short operation) immediately returns to the active state. At this time, since the output side of the buffer 301 is High, the semiconductor switching elements 3d to 3f are turned OFF and switched to the three-phase open state.
  • the three-phase open state is set and then the operation returns to the normal PWM control.
  • the upper and lower arm semiconductor switching elements can be prevented from being short-circuited during the three-phase short-circuit control, and the structure is highly safe. .
  • the dead time value guaranteed by the inverter circuit unit 103 is 5 ⁇ s
  • the three-phase open periods ( ⁇ t1, ⁇ t2) before and after the three-phase short period are at least 5 ⁇ s, so Occurrence can be reliably prevented.
  • the cost can be reduced compared to a configuration using a microcomputer and software.
  • the protection operation can be performed while ensuring a sufficient dead time, leading to an improvement in safety.
  • FIG. 6 is a diagram showing a detailed circuit of the three-phase short drive signal control logic 304.
  • the above-described dead time ⁇ t1 is generated by the circuit 602 and the circuit 603 in FIG.
  • the design constants of the resistors and capacitors provided in the circuits 602 and 603 can be adjusted.
  • control signals from the host microcomputer include the upper arm three-phase short signal for blocking the output of the buffer 302a and the lower arm three-phase short signal for blocking the output of the buffer 302b.
  • the motor drive control unit 105 sets a priority between the upper arm three-phase short signal and the lower arm three-phase short signal by using a three-phase short drive signal control logic 304 as shown in FIG. The upper and lower short circuit is not caused.
  • FIG. 6 a case is considered in which an upper arm three-phase short signal and a lower arm three-phase short signal are simultaneously input from the host microcomputer.
  • the output of the buffer 301 is shut off. For this reason, the upper arm three-phase short signal is not output, and upper and lower short circuits are prevented.
  • the priority of the upper and lower arms can be selected by switching the signal input. Further, an overvoltage detection signal and a ground fault detection signal are also input to the three-phase short drive signal control logic 304, so that a three-phase short signal, an overvoltage detection signal and a ground fault detection signal are simultaneously generated by the host microcomputer. Prevention becomes possible.
  • an alternating current is output from the inverter circuit unit 103 to the three-phase induction motor 104.
  • the output voltage of the current sensor 107 is a sine wave centered at 2.5V. Since the output current from the inverter to the three-phase induction motor is shifted by 120 degrees in the U phase, V phase, and W phase, the output voltage of the current sensor 107 in the U phase, V phase, and W phase is also shifted by 120 degrees. Yes.
  • the neutral point potential of the star connection is stabilized at about 2.5V.
  • the threshold value of the determiner 201 is 3V and the threshold value of the determiner 202 is 2V, the ground fault detection signal is not output, and the buffers 301, 302a, 302b, and 303 of the protection logic circuit 108 are in a conductive state.
  • the PWM signal from the motor control microcomputer 110 is sent to the gate drive unit 106 as it is to drive the three-phase induction motor 104 normally.
  • the output current from the inverter circuit unit 103 leaks from the ground fault point and is disturbed.
  • the output voltage of the current sensor 107 is also disturbed from the sine wave, and the potential of the neutral point 115 of the resistance load star-connected to the current sensor 107 varies from 2.5V.
  • the potential of the fluctuating neutral point 115 exceeds 3V, which is the upper threshold value of the determiner 201, or falls below 2V, which is the lower threshold value of the determiner 202, a ground fault detection signal is output.
  • the protection logic circuit 108 When a ground fault phenomenon is detected by such a ground fault detection device 109, the protection logic circuit 108 performs the following operation.
  • the ground fault detection signal 306 is input to the buffer 301 via the timer circuit 305 of the protection logic circuit 108 as shown in FIG.
  • the operation when the three phases are open is as described above, and all the switching elements 3a to 3f are turned off. In the three-phase open state, all of the switching elements 3a to 3f are turned off, so that no current is supplied to the three-phase induction motor 104 and no ground fault current flows.
  • the ground fault detection signal 306 is input to both the buffer 301 and the three-phase short drive signal control logic 304 via the timer circuit 305 of the protection logic circuit 108. Is done.
  • the operation at the time of three-phase short is as described above.
  • the upper arm three-phase short state in which switching elements 3a to 3c are turned on and the rest is turned off, or the lower arm three phases in which switching elements 3d to 3f are turned on and the rest are turned off. Short circuit.
  • the switching elements 3a to 3c or the switching elements 3d to 3f are turned on and the other switching elements are turned off, so that a current flows between the three-phase induction motor 104 and the switching element in the ON state. It is possible to recirculate, and it is possible to prevent inflow of current via the freewheeling diode.
  • the current sensor 107 of this embodiment uses a current sensor that is insulated by a Hall element, and is thereby insulated from the voltage of the DC power supply 101. Therefore, a ground fault detection unit is used with a weak power system (5V, etc.) power supply. 109 can be configured, and the size and cost can be reduced.
  • the resistors 112, 113, and 114 of the ground fault detection unit 109 are configured by network resistors, the relative error of the resistance values of the resistors 112, 113, and 114 can be reduced to reduce the resistance of the star-connected resistance load. Variation in the potential of the neutral point 115 can be suppressed, and the ground fault phenomenon can be detected with higher accuracy.
  • the ground drive detection unit 109 and the protection logic circuit 108 that performs the protection operation may be built in the gate drive unit 106.
  • the gate since the output of the current sensor 107 is input to the conductive motive drive control unit 105, the gate There is a need to increase the number of signal lines for sending signals from the current sensor 107 to the drive unit 106.
  • the gate drive unit 106 since the gate drive unit 106 is not a weak power source, it is necessary to increase the withstand voltage, and the circuit configuration is expensive. Therefore, it is not preferable.
  • the protection logic circuit 108 can be prevented from malfunctioning.
  • ground fault phenomenon of alternating current has been performed by microcomputer software processing based on the current sensor information, so depending on the abnormality of the microcomputer and the sampling timing for reading the current sensor information, the ground fault phenomenon may be detected.
  • the grounding phenomenon occurs because the operation time from the occurrence of an undetectable situation or the occurrence of an alternating current ground fault to the protection operation by the protection circuit depends on the processing speed of the microcomputer and the start cycle of the processing task. There is a problem that a situation occurs in which the protection operation against the time is not in time.
  • the output part of the current sensor that detects the current value of the alternating current flowing through the U-phase, V-phase, and W-phase output lines connecting between the inverter circuit part and the load such as the electric motor is provided.
  • Connect to a star-connected resistive load and input the neutral point output of the star-connected resistive load to the determiner to detect the ground fault phenomenon.
  • the gate drive circuit that drives the inverter circuit Since the protection logic circuit that restricts the operation is operated, it is possible to reliably cause a ground fault phenomenon and to supply a current from the current sensor to the resistive load. This makes it unnecessary to consider the countermeasures for increasing the breakdown voltage.

Abstract

La détection de mise à la terre d'un courant alternatif a été réalisée au moyen d'un traitement logiciel microinformatique à partir de la sortie de capteurs de courant, mais il y a eu des situations dans lesquelles il n'a pas été possible de détecter la terre en raison d'une anomalie d'un microordinateur ou en raison de la synchronisation d'échantillonnage d'un capteur de courant. En connectant des unités de sortie de capteurs de courant de phase U, de phase V et de phase W à une charge de résistances connectées en étoile, et en entrant une sortie de point neutre de la charge de résistances connectées en étoile à une unité de détermination, la mise à la terre peut être effectuée de manière fiable, et en outre, parce que le courant est fourni à la charge de résistances depuis les capteurs de courant, une configuration de circuit électrique faible peut être implémentée et la manipulation d'accroissements de la tension de résistance n'a pas à être prise en compte.
PCT/JP2012/079056 2011-12-20 2012-11-09 Dispositif de conversion de puissance WO2013094330A1 (fr)

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CN110148925A (zh) * 2019-04-17 2019-08-20 浙江正泰电器股份有限公司 用于变频器中电机接地故障的保护方法及变频器

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JP6305605B1 (ja) * 2017-05-22 2018-04-04 三菱電機株式会社 モータ制御装置
WO2023105584A1 (fr) * 2021-12-06 2023-06-15 株式会社安川電機 Système de conversion d'énergie électrique, module de puissance et module de commande

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JPH07227086A (ja) * 1994-02-07 1995-08-22 Mitsubishi Electric Corp インバータの故障検出方式
JPH11220898A (ja) * 1998-01-30 1999-08-10 Daikin Ind Ltd 電気機器の漏洩電流軽減装置
JP2002199744A (ja) * 2000-12-27 2002-07-12 Daikin Ind Ltd インバータ保護方法およびその装置

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JPH07227086A (ja) * 1994-02-07 1995-08-22 Mitsubishi Electric Corp インバータの故障検出方式
JPH11220898A (ja) * 1998-01-30 1999-08-10 Daikin Ind Ltd 電気機器の漏洩電流軽減装置
JP2002199744A (ja) * 2000-12-27 2002-07-12 Daikin Ind Ltd インバータ保護方法およびその装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110148925A (zh) * 2019-04-17 2019-08-20 浙江正泰电器股份有限公司 用于变频器中电机接地故障的保护方法及变频器

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