WO2021066153A1 - 電流検出装置、モータ制御装置、及び電流検出方法 - Google Patents

電流検出装置、モータ制御装置、及び電流検出方法 Download PDF

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Publication number
WO2021066153A1
WO2021066153A1 PCT/JP2020/037574 JP2020037574W WO2021066153A1 WO 2021066153 A1 WO2021066153 A1 WO 2021066153A1 JP 2020037574 W JP2020037574 W JP 2020037574W WO 2021066153 A1 WO2021066153 A1 WO 2021066153A1
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Prior art keywords
signal
current
detection
switching element
output
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Ceased
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PCT/JP2020/037574
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English (en)
French (fr)
Japanese (ja)
Inventor
茂生 角本
和之 指田
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Shindengen Electric Manufacturing Co Ltd
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Shindengen Electric Manufacturing Co Ltd
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Priority to JP2021551486A priority Critical patent/JP7262604B2/ja
Priority to DE112020004749.0T priority patent/DE112020004749T5/de
Priority to CN202080057159.0A priority patent/CN114222926B/zh
Publication of WO2021066153A1 publication Critical patent/WO2021066153A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Measuring current only

Definitions

  • the present invention relates to a current detection device, a motor control device, and a current detection method.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a current detection device, a motor control device, and a current detection method capable of reducing a current value detection error due to insufficient resolution of a sampling cycle. To do.
  • one aspect of the present invention is a current detection that has a first switching element and a second switching element connected in series and detects a current flowing through an inverter unit that generates an AC signal.
  • a first Rogowski coil that detects a current flowing through the first switching element
  • a second Rogowski coil that detects a current flowing through the second switching element
  • a composite signal is generated by adding the first detection signal obtained by integrating the output of the ski coil and the second detection signal obtained by integrating the output of the second Rogowski coil, and the AC signal is output based on the composite signal.
  • the inverter unit includes a plurality of pairs of the first switching element and the second switching element, and the first switching element and the first switching element.
  • the first Rogowski coil and the second Rogowski coil corresponding to each of the plurality of sets are generated by generating AC signals having different phases from each other corresponding to each of the plurality of sets of the two switching elements.
  • the detection processing unit may generate the combined signal corresponding to each of the plurality of sets, and detect the output current for each of the AC signals having different phases based on the combined signal.
  • the detection processing unit uses the total value of the total of the first detection signals corresponding to each of the plurality of sets as the input current of the inverter unit. It may be detected.
  • the detection processing unit is a phase of the AC signal of one phase of the plurality of AC signals having different phases, which is in a negative current period.
  • the negative current may be detected based on the output current of the other phase of the plurality of AC signals excluding the one phase.
  • one aspect of the present invention is a current detection device having a first switching element and a second switching element connected in series and detecting a current flowing through an inverter unit that generates an AC signal.
  • the outputs of the first Rogowski coil that detects the current flowing through the first switching element, the second Rogowski coil that detects the current flowing through the second switching element, and the output of the first Rogowski coil are integrated.
  • the AC signal is based on the detection signal having the larger duty ratio that makes the switching element conductive, out of the first detection signal obtained and the second detection signal obtained by integrating the output of the second Rogowski coil.
  • the detection processing unit in the above current detection device, the detection processing unit generates a composite signal obtained by adding the first detection signal and the second detection signal, and the combined signal is subjected to a composite signal.
  • the output current of the AC signal may be detected at the timing of the period of the detection signal having the larger duty ratio of the first detection signal and the second detection signal.
  • the detection processing unit is the period of the detection signal having the larger duty ratio of the first detection signal and the second detection signal.
  • the output current of the AC signal may be detected at the timing.
  • the detection processing unit integrates the output of the first Rogowski coil with a first integrator circuit having a reset function and the second integrator. It may be provided with a second integrator circuit with a reset function that integrates the output of the Rogowski coil.
  • one aspect of the present invention is based on the current detection device described above, the inverter unit that supplies the AC signal as a drive signal to the motor, and the output current detected by the current detection device. It is a motor control device including a switching element 1 and a motor control unit that controls switching of the second switching element.
  • one aspect of the present invention is a current detection method having a first switching element and a second switching element connected in series and detecting a current flowing through an inverter unit that generates an AC signal.
  • the first generation step in which the processing unit integrates the output of the first Rogowski coil that detects the current flowing through the first switching element to generate the first detection signal, and the detection processing unit A second generation step of integrating the output of the second Rogowski coil that detects the current flowing through the second switching element to generate a second detection signal, and the detection processing unit perform the first generation step.
  • a composite signal is generated by adding the first detection signal generated by the above and the second detection signal generated by the first generation step, and the output current of the AC signal is detected based on the composite signal.
  • This is a current detection method including a detection processing step to be performed.
  • one aspect of the present invention is a current detection method having a first switching element and a second switching element connected in series and detecting a current flowing through an inverter unit that generates an AC signal.
  • the first generation step in which the processing unit integrates the output of the first Rogowski coil that detects the current flowing through the first switching element to generate the first detection signal, and the detection processing unit A second generation step of integrating the output of the second Rogowski coil that detects the current flowing through the second switching element to generate a second detection signal, and the detection processing unit perform the first generation step. Based on the detection signal having the larger duty ratio that makes the switching element conductive, of the first detection signal generated by the above and the second detection signal generated by the first generation step.
  • This is a current detection method including a detection processing step for detecting the output current of an AC signal.
  • the current detection device includes a first Rogowski coil that detects the current flowing through the first switching element and a second Rogowski coil that detects the current flowing through the second switching element.
  • the detection processing unit generates a composite signal obtained by adding the first detection signal obtained by integrating the output of the first Rogowski coil and the second detection signal obtained by integrating the output of the second Rogowski coil.
  • the output current of the AC signal is detected based on the signal.
  • the current detection device can generate a composite signal close to the actual waveform of the output current of the AC signal, so that it is possible to reduce the detection error of the current value due to insufficient resolution of the sampling period. Therefore, the current detection device can realize precise current detection with an inexpensive configuration having a low resolution of the sampling cycle.
  • FIG. 1 is a block diagram showing an example of the motor control device 1 according to the present embodiment.
  • the motor control device 1 includes a DC power supply 2, a smoothing capacitor 4, a current detection device 10, an inverter unit 20, and a motor control unit 30. Further, the motor control device 1 is connected to the motor 3.
  • the DC power supply 2 is, for example, a battery or the like, and supplies DC power to the motor control device 1.
  • the motor 3 is, for example, a sine wave-driven three-phase brushless motor, which is driven by an AC signal (U-phase signal, V-phase signal, W-phase signal) supplied as a drive signal from the inverter unit 20 of the motor control device 1.
  • an AC signal U-phase signal, V-phase signal, W-phase signal
  • the smoothing capacitor 4 is connected between the power supply line L1 connected to the positive electrode terminal of the DC power supply 2 and the ground line L2 connected to the negative electrode terminal of the DC power supply 2, and receives the DC voltage supplied from the DC power supply 2. Smooth.
  • the inverter unit 20 generates AC signals (U-phase signal, V-phase signal, W-phase signal) for driving the motor 3 based on the control of the motor control unit 30.
  • the inverter unit 20 includes switching elements 21-1 to 21-3 and switching elements 22-1 to 22-3.
  • the inverter unit 20 uses, for example, a three-phase sine wave current signal with a phase shift of 120 degrees as a drive signal by switching the switching elements 21-1 to 21-3 and the switching elements 22-1 to 22-3. Generate.
  • the switching elements 21-1 to 21-3 correspond to the high arm which is the upper switching element (first switching element), and indicate an arbitrary upper switching element included in the inverter unit 20. , Or, when not particularly distinguished, it will be described as the switching element 21.
  • the switching elements 22-1 to 22-3 correspond to a low arm which is a lower switching element (second switching element), and indicate an arbitrary lower switching element included in the inverter unit 20, or particularly. When no distinction is made, the switching element 22 will be described.
  • the switching element 21 and the switching element 22 are connected in series between the power supply line L1 and the ground line L2 to form a full bridge circuit.
  • the switching elements 21 (21-1 to 21-3) and the switching elements 22 (22-1 to 22-3) are, for example, N-type MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors).
  • the switching element 21-1 and the switching element 22-1 are connected in series between the power supply line L1 and the ground line L2 to form a full bridge circuit that generates a U-phase signal which is a U-phase drive signal.
  • the switching element 21-1 and the switching element 22-1 are switched based on the control signals (S1, S2) output from the motor control unit 30, and are connected in series to the switching element 21-1 and the switching element 22-1.
  • a U-phase signal is output from the node N1 between and.
  • the switching element 21-2 and the switching element 22-2 are connected in series between the power supply line L1 and the ground line L2 to form a full bridge circuit that generates a V-phase signal which is a V-phase drive signal.
  • the switching element 21-2 and the switching element 22-2 are switched based on the control signals (S3, S4) output from the motor control unit 30, and are connected in series to the switching element 21-2 and the switching element 22-2.
  • a V-phase signal is output from the node N2 between and.
  • the switching element 21-3 and the switching element 22-3 are connected in series between the power supply line L1 and the ground line L2 to form a full bridge circuit that generates a W phase signal which is a W phase drive signal.
  • the switching element 21-3 and the switching element 22-3 are switched based on the control signals (S5, S6) output from the motor control unit 30, and are connected in series to the switching element 21-3 and the switching element 22-3.
  • a W-phase signal is output from the node N3 between and.
  • the inverter unit 20 includes a plurality of pairs of the switching element 21 and the switching element 22, and the AC signals (U-phase signals) having different phases corresponding to each of the plurality of pairs of the switching element 21 and the switching element 22. , V-phase signal, W-phase signal).
  • the current detection device 10 detects the current flowing through the inverter unit 20.
  • the current detection device 10 detects, for example, the output current of the drive signal (alternating current signal) of each phase generated by the inverter unit 20. Further, the current detection device 10 detects the input current from the DC power supply 2 (the input current of the inverter unit 20).
  • the current detection device 10 includes Rogowski coils 11-1 to 11-3, Rogowski coils 12-1 to 12-3, and a detection processing unit 13.
  • the Rogowski coils 11-1 to 11-3 are air-core coils that detect the current flowing through the switching elements 21 (21-1 to 21-3), and are arbitrarily provided by the current detection device 10.
  • the Rogowski coil first Rogowski coil
  • the Rogowski coils 12-1 to 12-3 are air-core coils that detect the current flowing through the switching elements 22 (22-1 to 22-3), and are for any switching element 22 included in the current detection device 10.
  • the Rogowski coil second Rogowski coil
  • the Rogowski coil 12 will be described.
  • the Rogowski coil 11 detects the current flowing through the switching element 21.
  • the Rogowski coil 11-1 is arranged on a signal line connecting the drain terminal of the switching element 21-1 and the power supply line L1, and detects the current flowing through the switching element 21-1.
  • the Rogowski coil 11-2 is arranged on a signal line connecting the drain terminal of the switching element 21-2 and the power supply line L1, and detects the current flowing through the switching element 21-2.
  • the Rogowski coil 11-3 is arranged on a signal line connecting the drain terminal of the switching element 21-3 and the power supply line L1, and detects the current flowing through the switching element 21-3.
  • the Rogowski coil 12-1 is arranged on a signal line connecting the source terminal of the switching element 22-1 and the ground line L2, and detects the current flowing through the switching element 22-1.
  • the Rogowski coil 12-2 is arranged on a signal line connecting the source terminal of the switching element 22-2 and the ground line L2, and detects the current flowing through the switching element 22-2.
  • the Rogowski coil 12-3 is arranged on a signal line connecting the source terminal of the switching element 22-3 and the ground line L2, and detects the current flowing through the switching element 22-3.
  • the current detection device 10 includes a Rogowski coil 11 and a Rogowski coil 12 corresponding to each of a plurality of sets of the switching element 21 and the switching element 22.
  • the detection processing unit 13 is a processing unit that executes a process of detecting the current flowing through the inverter unit 20.
  • the detection processing unit 13 generates, for example, a composite signal obtained by adding the first detection signal obtained by integrating the output of the Rogowski coil 11 and the second detection signal obtained by integrating the output of the Rogowski coil 12, and the combined signal is combined with the combined signal. Based on this, the output current of the AC signal is detected.
  • the detection processing unit 13 generates a composite signal corresponding to each of the plurality of sets, and detects the output current for each AC signal having a different phase based on the composite signal. Specifically, the detection processing unit 13 outputs the generated combined signal as a current signal indicating the output current of the drive signal (U-phase signal, V-phase signal, W-phase signal) of the motor 3.
  • the detection processing unit 13 detects the total value of the total of the first detection signals corresponding to each of the plurality of sets of the switching element 21 and the switching element 22 as the input current of the inverter unit 20. Specifically, the detection processing unit 13 outputs an input current signal indicating an input current (input current of the inverter unit 20).
  • the detection processing unit 13 is a drive signal (AC signal) of one phase of a plurality of drive signals (U-phase signal, V-phase signal, W-phase signal) having different phases, which are in a negative current period. Negative current is detected based on the output currents of the other phases of the plurality of drive signals excluding the one phase.
  • the detection processing unit 13 calculates by adding the V-phase output current and the W-phase output current, for example, when the U-phase drive signal is in the period during which a negative current flows.
  • the detection processing unit 13 outputs a negative current signal indicating a negative current of the drive signal (AC signal).
  • the motor control unit 30 is, for example, a processor including a CPU (Central Processing Unit) and the like, and controls the motor control device 1 in an integrated manner.
  • the motor control unit 30 controls switching between the switching element 21 and the switching element 22 based on the output current of the drive signal (alternating current signal) detected by the current detection device 10.
  • the motor control unit 30 includes, for example, an ADC (Analog to Digital Converter) (not shown), and converts the voltage of each current signal output by the detection processing unit 13 of the current detection device 10 into a current value for acquisition. For example, the motor control unit 30 acquires the current value of the current signal output by the detection processing unit 13 via the ADC, and detects a point (zero cross point) at which the current has zero gloss based on the current value of the current signal. To do. The motor control unit 30 controls switching between the switching element 21 and the switching element 22 based on the detected zero cross point.
  • ADC Analog to Digital Converter
  • the motor control unit 30 acquires, for example, the current value of the input current signal output by the detection processing unit 13 via the ADC, and detects the maximum value of the current value of the input current signal.
  • the motor control unit 30 uses the maximum value of the detected current value for overcurrent detection. That is, when the maximum value of the detected current value becomes equal to or higher than a predetermined threshold value, the motor control unit 30 determines that an overcurrent abnormality has occurred and performs an abnormality process such as stopping the driving of the motor 3. To execute.
  • the motor control unit 30 acquires, for example, the current value of the negative current signal output by the detection processing unit 13 via the ADC, and detects the maximum value (maximum negative current value) of the current value of the negative current signal. To do.
  • the motor control unit 30 uses the detected maximum negative current value for overcurrent detection. That is, when the detected maximum negative current value becomes equal to or higher than a predetermined threshold value, the motor control unit 30 determines that an overcurrent abnormality has occurred and performs an abnormality process such as stopping the driving of the motor 3. Execute.
  • FIG. 2 is a block diagram showing an example of the detection processing unit 13 in the present embodiment.
  • the detection processing unit 13 includes integrator circuits 40-1 to 40-6, adders 50-1 to 50-6, and adder 51.
  • the integrator circuits 40-1 to 40-6 have the same configuration, and are used as the integrator circuit 40 when indicating an arbitrary integrator circuit included in the detection processing unit 13 or when not particularly distinguished. explain. Further, the adders 50-1 to 50-6 have the same configuration, and will be described as the adder 50 when indicating an arbitrary adder included in the detection processing unit 13 or when not particularly distinguished.
  • the integrator circuit 40-1 is connected to the Rogowski coil 11-1, and outputs a detection signal UH that integrates the output of the Rogowski coil 11-1. Further, the integrating circuit 40-2 is connected to the Rogowski coil 12-1, and outputs a detection signal UL that integrates the output of the Rogowski coil 12-1.
  • the integrating circuit 40-3 is connected to the Rogowski coil 11-2, and outputs a detection signal VH that integrates the output of the Rogowski coil 11-2.
  • the integrating circuit 40-4 is connected to the Rogowski coil 12-2 and outputs a detection signal VL that integrates the output of the Rogowski coil 12-2.
  • the integrating circuit 40-5 is connected to the Rogowski coil 11-3, and outputs a detection signal WH that integrates the output of the Rogowski coil 11-3.
  • the integrating circuit 40-6 is connected to the Rogowski coil 12-3, and outputs a detection signal WL that integrates the output of the Rogowski coil 12-3.
  • the integrator circuit 40 (40-1 to 40-6) has a reset function and integrates the outputs of the Rogowski coils (11, 12).
  • FIG. 3 is a circuit diagram showing an example of the integrating circuit 40 in the present embodiment.
  • the integrating circuit 40 includes a resistor 41, an operational amplifier 42, a capacitor 43, and a reset switch 44.
  • the resistor 41 is connected between one end of the Rogowski coil 11 (12) and the inverting input terminal of the operational amplifier 42.
  • the capacitor 43 is connected between the inverting input terminal (node N5) of the operational amplifier 42 and the output terminal (node N5) of the operational amplifier 42.
  • the operational amplifier 42 functions as an integrating circuit by connecting the resistor 41 and the capacitor 43.
  • one end of the Rogowski coil 11 (12) is connected to the inverting input terminal via a resistor 41, and the other end of the Rogowski coil 11 (12) is connected to the non-inverting input.
  • the operational amplifier 42 uses the output of the Rogowski coil 11 (12) as an input signal (IN), and outputs an output signal (OUT) obtained by integrating the output of the Rogowski coil 11 (12).
  • the reset switch 44 is connected in parallel with the capacitor 43 between the inverting input terminal (node N4) of the operational amplifier 42 and the output terminal (node N5) of the operational amplifier 42.
  • the reset switch 44 is a switch that resets the output potential of the integrator circuit 40, and the conduction state is controlled by, for example, a pulse signal from the control signal S.
  • the reset switch 44 is controlled to a conduction state (on state) when the integration circuit 40 is reset.
  • the integrator circuit 40 functions as an integrator circuit when the reset switch 44 is controlled to a non-conducting state (off state) by the control signal S. Further, the control signal S resets the integrating circuit 40 when the switching of the switching element 21 and the switching element 22 described above is stopped, and when the switching element 21 and the switching element 22 are switched, for example, the control signal S is used. It is controlled by the motor control unit 30 so that the integrator circuit 40 operates.
  • the integrator circuit 40-1, the integrator circuit 40-3, and the integrator circuit 40-5 correspond to the first integrator circuit, and the detection signal UH, the detection signal VH, and the detection signal WH correspond to the first integrator circuit.
  • the detection signal of 1 corresponds to the detection signal of 1.
  • the integrator circuit 40-2, the integrator circuit 40-4, and the integrator circuit 40-6 correspond to the second integrator circuit, and the detection signal UL, the detection signal VL, and the detection signal WL correspond to the second detection signal.
  • the detection signal UH, the detection signal VH, and the detection signal WH correspond to the first integrator circuit.
  • the integrator circuit 40-2, the integrator circuit 40-4, and the integrator circuit 40-6 correspond to the second integrator circuit
  • the detection signal UL, the detection signal VL, and the detection signal WL correspond to the second detection signal.
  • the adder 50 is a 2-input analog adder, and is realized by, for example, an adder circuit using an operational amplifier.
  • the adder 50 outputs a composite signal obtained by adding two input signals.
  • the detection signal UH and the detection signal UL are input to the adder 50-1 as two input signals, and the adder 50-1 receives a composite signal obtained by adding the detection signal UH and the detection signal UL. It is output as a phase current signal UC.
  • the detection signal VH and the detection signal VL are input to the adder 50-2 as two input signals, and the adder 50-2 receives a composite signal obtained by adding the detection signal VH and the detection signal VL to V. It is output as a phase current signal VC.
  • the detection signal WH and the detection signal WL are input to the adder 50-3 as two input signals, and the adder 50-3 receives a composite signal obtained by adding the detection signal WH and the detection signal WL to W. It is output as a phase current signal WC.
  • the detection processing unit 13 generates a composite signal (U-phase current signal UC, V-phase current signal VC, W-phase current signal WC) corresponding to each of the plurality of sets of the switching element 21 and the switching element 22.
  • the output current for each drive signal (AC signal) having a different phase is detected based on the combined signal. That is, the detection processing unit 13 outputs the generated combined signal (U-phase current signal UC, V-phase current signal VC, W-phase current signal WC) for each drive signal (U-phase signal, V-phase signal, W-phase signal). It is output as a current signal indicating the current.
  • a V-phase current signal VC and a W-phase current signal WC are input to the adder 50-4 as two input signals, and the adder 50-4 has a V-phase current signal VC and a W-phase current signal WC. Is output as a U-phase negative current signal UMC. That is, the adder 50-4 uses the negative current of the U-phase signal during the negative current period as the output current of the other phases excluding the U-phase (V-phase current signal VC and W-phase current signal WC). Is output as a U-phase negative current signal UMC.
  • the U-phase current signal UC and the W-phase current signal WC are input to the adder 50-5 as two input signals, and the adder 50-5 has the U-phase current signal UC and the W-phase current signal WC. Is output as a V-phase negative current signal VMC. That is, the adder 50-5 uses the negative current of the V-phase signal during the negative current period as the output current of the other phases excluding the V-phase (U-phase current signal UC and W-phase current signal WC). Is output as a V-phase negative current signal VMC.
  • the U-phase current signal UC and the V-phase current signal VC are input to the adder 50-6 as two input signals, and the adder 50-6 has the U-phase current signal UC and the V-phase current signal VC. Is output as a W phase negative current signal WMC. That is, the adder 50-6 uses the negative current of the W-phase signal during the negative current period as the output current of the other phases excluding the W-phase (U-phase current signal UC and V-phase current signal VC). Is output as a W-phase negative current signal WMC.
  • the detection processing unit 13 determines the negative current of the drive signal of one phase of the three-phase drive signals (U-phase signal, V-phase signal, W-phase signal) that is in the negative current period. , Detection is performed based on the output current (current signal) of the other phase of the plurality of drive signals excluding the one phase.
  • the detection processing unit 13 outputs the generated negative current signal (U-phase negative current signal UMC, V-phase negative current signal VMC, W-phase negative current signal WMC) as a current signal indicating a negative current for each drive signal.
  • the adder 51 is a 3-input analog adder, and is realized by, for example, an adder circuit using an operational amplifier.
  • the adder 51 outputs a composite signal obtained by adding three input signals.
  • the detection signal UH, the detection signal VH, and the detection signal WH are input to the adder 51 as three input signals, and the adder 51 receives a composite signal obtained by adding the detection signal UH, the detection signal VH, and the detection signal WH. , Output as an input current signal BTC.
  • the detection processing unit 13 detects the total value of the sum of the three first detection signals (detection signal UH, detection signal VH, and detection signal WH) as the input current of the inverter unit 20. That is, the detection processing unit 13 outputs the input current signal BTC as a current signal indicating the input current.
  • FIG. 4 is a diagram illustrating the operation of the motor control unit 30 in the present embodiment.
  • FIG. 5 is a diagram showing an example of a motor-driven current waveform according to the present embodiment.
  • the “driving state” shows the state of the driving signal when one circumference is 360 degrees, and is divided into six states, state ST1 to state ST6.
  • the motor control unit 30 performs the switching control shown in FIG. 4 and performs 180-degree energization control.
  • the "U-phase high arm” indicates the control of the upper switching element 21-1 for the U-phase
  • the "U-phase low arm” indicates the control of the lower switching element 22-1 for the U-phase.
  • the "V-phase high arm” indicates the control of the upper switching element 21-2 for the V-phase
  • the "V-phase low arm” indicates the control of the lower switching element 22-2 for the V-phase.
  • the "W-phase high arm” indicates the control of the upper switching element 21-3 for the W phase
  • the "W-phase low arm” indicates the control of the lower switching element 22-3 for the W phase. ..
  • the motor control unit 30 controls the switching element 21-1 and the switching element 22-1 by the control signal S1 and the control signal S2 during the period from the state ST1 to the state ST3 as the control of the U-phase drive signal.
  • SW indicates a switching operation by PWM (Pulse Width Modulation)
  • / SW indicates an inversion control of switching by "SW”.
  • the motor control unit 30 turns off the switching element 21-1 by the control signal S1 during the period from the state ST4 to the state ST6, and turns on the switching element 22-1 by the control signal S2. Put it in a state.
  • the motor control unit 30 switches the switching element 21-2 and the switching element 22-2 by the control signal S3 and the control signal S4 during the period from the state ST3 to the state ST5 as the control of the V-phase drive signal. Further, the motor control unit 30 turns off the switching element 21-2 by the control signal S3 during the periods of the states ST6, ST1 and ST2 as the control of the V-phase drive signal, and the switching element 22- by the control signal S4. Turn 2 on.
  • the motor control unit 30 switches the switching element 21-3 and the switching element 22-3 by the control signal S5 and the control signal S6 during the states ST5, ST6, and ST1 as the control of the W phase drive signal. To do. Further, the motor control unit 30 turns off the switching element 21-3 by the control signal S5 and turns on the switching element 22-3 by the control signal S6 during the period from the state ST2 to the state ST4 as the control of the W phase drive signal. Put it in a state.
  • the waveform W1 shows a U-phase current waveform
  • the waveform W2 shows a W-phase current waveform
  • the waveform W3 shows a W-phase current waveform.
  • FIG. 6 is a diagram illustrating a composite signal generation process in the present embodiment.
  • the waveform W4 shows the voltage waveform of the detection signal UH
  • the waveform W5 shows the voltage waveform of the detection signal UL
  • the waveform W6 shows the voltage waveform of the U-phase current signal UC.
  • the integrating circuit 40-1 of the detection processing unit 13 integrates the output of the Rogowski coil 11-1 and outputs a detection signal UH as shown in the waveform W4. Further, the integration circuit 40-2 of the detection processing unit 13 integrates the output of the Rogowski coil 12-1 and outputs a detection signal UL as shown in the waveform W5.
  • the adder 50-1 generates a U-phase current signal UC as shown in the waveform W6 as a composite signal obtained by adding the detection signal UH as shown in the waveform W4 and the detection signal UL as shown in the waveform W5. Output.
  • This U-phase current signal UC is a signal obtained by converting the output current (positive current) of the U-phase drive signal into a voltage.
  • the detection processing unit 13 also generates and outputs the V-phase current signal VC and the W-phase current signal WC in the same manner as the U-phase current signal UC. That is, the detection processing unit 13 generates the U-phase current signal UC, the V-phase current signal VC, and the W-phase current signal WC by the following equations (1) to (3).
  • U-phase current signal UC detection signal UH + detection signal UL ...
  • V-phase current signal VC detection signal VH + detection signal VL ...
  • W-phase current signal WC detection signal WH + detection signal WL ...
  • the motor control unit 30 acquires the U-phase current signal UC, the V-phase current signal VC, and the W-phase current signal WC generated by the detection processing unit 13 via an ADC (not shown), and zero-crosses the output current of each phase. Used for point detection.
  • the motor control unit 30 performs the switching control shown in FIG. 4 described above based on the detected zero cross point.
  • the detection processing unit 13 generates a U-phase negative current signal UMC, a V-phase negative current signal VMC, and a W-phase negative current signal WMC by the following equations (4) to (6).
  • the detection processing unit 13 when the U-phase negative current signal UMC is generated, the current value of the U-phase negative current signal UMC (current value Iu of the waveform W1 shown in FIG. 5) is the current value Iv of the waveform W2 shown in FIG. 5 and the waveform. It is an addition value to the current value Iw of W3. Therefore, the detection processing unit 13 generates a U-phase negative current signal UMC by the above equation (4). That is, the adder 50-4 of the detection processing unit 13 adds the V-phase current signal VC and the W-phase current signal WC to generate a U-phase negative current signal UMC.
  • the motor control unit 30 acquires the U-phase negative current signal UMC, the V-phase negative current signal VMC, and the W-phase negative current signal WMC generated by the detection processing unit 13 via an ADC (not shown), and the negative of each phase.
  • the maximum value of the current signal is used for abnormality detection (for example, overcurrent detection) during a negative current period.
  • the detection processing unit 13 generates an input current signal BTC by the following equation (7). That is, the adder 51 of the detection processing unit 13 generates the total value obtained by adding the detection signal UH, the detection signal VH, and the detection signal WH as the input current signal BTC.
  • Input current signal BTC detection signal UH + detection signal VH + Detection signal WH ⁇ ⁇ ⁇ (7)
  • the motor control unit 30 acquires the input current signal BTC generated by the detection processing unit 13 via an ADC (not shown), and uses the maximum value of the input current signal BTC for abnormality detection (for example, overcurrent detection).
  • FIG. 7 is a flowchart showing an example of the output current detection process of the current detection device 10 according to the present embodiment.
  • the current detection device 10 when detecting the output current (positive current) of each phase of the inverter unit 20, the current detection device 10 first integrates the output of the upper Rogowski coil 11 to perform the first detection. Generate a signal (step S101). For example, in the detection processing unit 13 of the current detection device 10, the integrating circuit 40-1 integrates the output of the Rogoski coil 11-1 to generate a detection signal UH, and the integrating circuit 40-3 uses the Rogoski coil. The output of 11-2 is integrated to generate the detection signal VH. Further, the integrating circuit 40-5 integrates the output of the Rogowski coil 11-3 to generate a detection signal WH.
  • the current detection device 10 integrates the output of the lower Rogowski coil 12 to generate a second detection signal (step S102).
  • the integrating circuit 40-2 integrates the output of the Rogoski coil 12-1 to generate a detection signal UL
  • the integrating circuit 40-4 integrates the output of the Rogoski coil 12-2. Is integrated to generate the detection signal VL.
  • the integrating circuit 40-6 integrates the output of the Rogowski coil 12-3 to generate a detection signal WL.
  • detection processing unit 13 may execute the processing of step S101 and the processing of step S102 in the reverse order, or may be executed in parallel using, for example, the configuration shown in FIG.
  • the current detection device 10 adds the first detection signal and the second detection signal to generate a composite signal (step S103).
  • the adder 50-1 adds the detection signal UH and the detection signal UL to generate a U-phase current signal UC as a combined signal.
  • the adder 50-2 adds the detection signal VH and the detection signal VL to generate a V-phase current signal VC as a combined signal.
  • the adder 50-3 adds the detection signal WH and the detection signal WL to generate a W-phase current signal WC as a combined signal.
  • the current detection device 10 detects the output current based on the combined signal (step S104). For example, the detection processing unit 13 outputs the U-phase current signal UC, the V-phase current signal VC, and the W-phase current signal WC to the motor control unit 30 as current signals indicating the output currents of each phase. After the process of step S104, the current detection device 10 ends the output current detection process.
  • the current detection device 10 repeatedly executes the processes of steps S101 to S103. Further, in the above description, the detection processing unit 13 detects the output currents of the three phases in parallel, but the output currents of the respective phases may be detected independently. For example, the detection processing unit 13 may detect the output current by the above processing only during the period when each phase has a positive current.
  • FIG. 8 is a flowchart showing an example of the input current detection process of the current detection device 10 according to the present embodiment.
  • the current detection device 10 when performing the input current detection process, the current detection device 10 first integrates the outputs of the Rogowski coils 11 on the upper side of each phase to generate the first detection signal of each phase. (Step S201).
  • the integrating circuit 40-1 integrates the output of the Rogoski coil 11-1 to generate a detection signal UH
  • the integrating circuit 40-3 uses the Rogoski coil.
  • the output of 11-2 is integrated to generate the detection signal VH.
  • the integrating circuit 40-5 integrates the output of the Rogowski coil 11-3 to generate a detection signal WH.
  • the current detection device 10 adds the first detection signals of each phase to generate an input current signal (step S202).
  • the adder 51 adds the detection signal UH, the detection signal VH, and the detection signal WH to generate an input current signal BTC.
  • the current detection device 10 detects the input current based on the input current signal (step S203). For example, the detection processing unit 13 outputs an input current signal BTC to the motor control unit 30 as a current signal indicating an input current. The current detection device 10 repeatedly executes the processes from step S201 to step S203.
  • FIG. 9 is a flowchart showing an example of the negative current detection process of the current detection device 10 according to the present embodiment.
  • the current detection device 10 when performing the negative current detection process, the current detection device 10 first generates a combined signal of each phase (step S301).
  • the current detection device 10 generates a combined signal of each phase by the processing of steps S101 to S103 shown in FIG. 7 described above.
  • the current detection device 10 adds a signal other than the combined phase signal during the negative current period to generate a negative current signal (step S302).
  • the detection processing unit 13 of the current detection device 10 uses the above equations (4) to (6) to generate a negative current signal for each phase.
  • the adder 50-4 adds the V-phase current signal VC and the W-phase current signal WC to generate a U-phase negative current signal UMC.
  • the adder 50-5 adds the U-phase current signal UC and the W-phase current signal WC to generate a V-phase negative current signal VMC.
  • the adder 50-6 adds the U-phase current signal UC and the V-phase current signal VC to generate a W-phase negative current signal WMC.
  • the current detection device 10 detects the negative current of the AC signal based on the negative current signal (step S303). For example, the detection processing unit 13 outputs the U-phase negative current signal UMC, the V-phase negative current signal VMC, and the W-phase negative current signal WMC to the motor control unit 30 as current signals indicating the negative current signals of each phase. After the process of step S303, the current detection device 10 ends the negative current detection process.
  • the current detection device 10 repeatedly executes the processes from step S301 to step S303. Further, in the above description, the detection processing unit 13 detects the negative current in parallel for the three phases, but the output current of each phase may be detected independently. For example, the detection processing unit 13 may detect the negative current by the above processing only during the period when each phase has a negative current.
  • the current detection device 10 has a switching element 21 (first switching element) and a switching element 22 (second switching element) connected in series, and has an AC signal (driving).
  • a current detection device that detects the current flowing through the inverter unit 20 that generates a signal), and detects the Rogowski coil 11 (first Rogowski coil) and the Rogowski coil 12 (second Rogowski coil).
  • a processing unit 13 is provided.
  • the Rogowski coil 11 detects the current flowing through the switching element 21.
  • the Rogowski coil 12 detects the current flowing through the switching element 22.
  • the detection processing unit 13 generates a composite signal obtained by adding the first detection signal obtained by integrating the output of the Rogowski coil 11 and the second detection signal obtained by integrating the output of the Rogowski coil 12, and based on the combined signal. , Detects the output current of the AC signal (drive signal).
  • the current detection device 10 according to the present embodiment can generate a composite signal close to the actual waveform of the output current of the AC signal (drive signal), thus reducing the detection error of the current value due to insufficient resolution of the sampling cycle. can do. Therefore, the current detection device 10 according to the present embodiment can realize precise current detection by an inexpensive configuration having a low resolution of the sampling cycle.
  • the inverter unit 20 includes a plurality of pairs of the switching element 21 and the switching element 22, and the AC signals having different phases corresponding to each of the plurality of pairs of the switching element 21 and the switching element 22 ( U-phase signal, V-phase signal, W-phase signal) is generated.
  • the current detection device 10 includes a Rogowski coil 11 and a Rogowski coil 12 corresponding to each of a plurality of sets of the switching element 21 and the switching element 22.
  • the detection processing unit 13 generates a composite signal (U-phase current signal UC, V-phase current signal VC, and W-phase current signal WC) corresponding to each of a plurality of sets of the switching element 21 and the switching element 22. Based on the combined signal, the output current for each AC signal with a different phase is detected.
  • the current detection device 10 can obtain the output current for each AC signal (drive signal) of a plurality of phases (three phases of U phase, V phase, and W phase) at a low cost with a low sampling cycle resolution. Precise detection is possible due to the various configurations.
  • the detection processing unit 13 detects the total value of the total value of the switching element 21, the switching element 22, and the first detection signals corresponding to each of the plurality of sets as the input current of the inverter unit 20.
  • the current detection device 10 according to the present embodiment can more accurately detect the input current of the inverter unit 20 with an inexpensive configuration.
  • the motor control device 1 according to the present embodiment can perform abnormality detection due to overcurrent with high accuracy by utilizing the input current of the inverter unit 20 detected by the current detection device 10.
  • the detection processing unit 13 uses the negative current of one phase of the AC signal (drive signal) in the negative current period among the plurality of AC signals (drive signals) having different phases. , Detect based on the output current of the other phase of the plurality of AC signals excluding the one phase.
  • the detection processing unit 13 detects, for example, the maximum value of the added value obtained by adding the output currents of the other phases as the maximum value of the negative current of the AC signal (drive signal).
  • the current detection device 10 can detect the current of the AC signal (drive signal) during the negative current period with an inexpensive configuration. Further, the motor control device 1 according to the present embodiment can use the negative current of the AC signal (drive signal) detected by the current detection device 10 to accurately detect an abnormality due to an overcurrent during the period of the negative current. it can.
  • the detection processing unit 13 integrates the output of the Rogowski coil 11 with a first integrator circuit having a reset function (for example, an integrator circuit 40-1, an integrator circuit 40-3, and an integrator circuit). 40-5) and a second integrator circuit with a reset function (for example, integrator circuit 40-2, integrator circuit 40-4, and integrator circuit 40-6) that integrates the output of the Rogowski coil 12. ..
  • the current detection device 10 can reset the integrator circuit 40 each time it is detected, so that the output of the Rogowski coil 11 (12) can be accurately integrated. Further, the current detecting device 10 according to the present embodiment is provided with a plurality of integrating circuits 40, so that processing can be performed in parallel and the output current can be detected in real time.
  • the motor control device 1 includes the above-mentioned current detection device 10, an inverter unit 20, and a motor control unit 30.
  • the inverter unit 20 supplies an AC signal as a drive signal to the motor 3.
  • the motor control unit 30 controls switching between the switching element 21 and the switching element 22 based on the output current detected by the current detection device 10.
  • the motor control device 1 according to the present embodiment has the same effect as the current detection device 10 described above, and can reduce the detection error of the current value due to insufficient resolution of the sampling cycle.
  • the current detection method is a current detection method that has a switching element 21 and a switching element 22 connected in series and detects a current flowing through an inverter unit 20 that generates an AC signal.
  • a generation step, a second generation step, and a detection processing step are included.
  • the detection processing unit 13 integrates the output of the Rogowski coil 11 that detects the current flowing through the switching element 21 to generate the first detection signal.
  • the detection processing unit 13 integrates the output of the Rogowski coil 12 that detects the current flowing through the switching element 22 to generate the second detection signal.
  • the detection processing unit 13 In the detection processing step, the detection processing unit 13 generates a composite signal obtained by adding the first detection signal generated by the first generation step and the second detection signal generated by the first generation step. The output current of the AC signal is detected based on the combined signal.
  • the current detection method according to the present embodiment has the same effect as the current detection device 10 and the motor control device 1 described above, and can reduce the detection error of the current value due to insufficient resolution of the sampling cycle.
  • FIG. 10 is a diagram illustrating an example of ringing of the detection signal.
  • the waveform W7 shows the voltage waveform of the detection signal LU by the Rogowski coil 12-1.
  • ringing may occur at the rising edge as in the period TR1 shown in the waveform W7.
  • the detection timing of the detection signal is set to the ringing occurrence period (for example, period TR1). Due to the overlap, it was difficult to detect the current accurately. Therefore, in the present embodiment, a modification that reduces the influence of this ringing and realizes precise current detection will be described.
  • FIG. 11 is a block diagram showing an example of the motor control device 1a according to the second embodiment.
  • the motor control device 1a includes a DC power supply 2, a smoothing capacitor 4, a current detection device 10a, an inverter unit 20, and a motor control unit 30a.
  • the same reference numerals are given to the same configurations as those in FIG. 1, and the description thereof will be omitted.
  • the current detection device 10a detects the current flowing through the inverter unit 20, and includes Rogowski coils 11-1 to 11-3, Rogowski coils 12-1 to 12-3, and a detection processing unit 13a.
  • the configurations of the detection processing unit 13a and the motor control unit 30a are different, and these configurations will be described below.
  • the detection processing unit 13a has the same basic functions as the detection processing unit 13 of the first embodiment, except that the detection processing unit 13a performs the detection processing for reducing ringing described above.
  • the detection processing unit 13a brings the switching elements (21, 22) of the first detection signal obtained by integrating the output of the Rogowski coil 11 and the second detection signal obtained by integrating the output of the Rogowski coil 12 into a conductive state.
  • the output current of the AC signal is detected based on the detection signal having the larger duty ratio.
  • the detection processing unit 13a generates a composite signal obtained by adding the first detection signal and the second detection signal, and has a larger duty ratio of the first detection signal and the second detection signal with respect to the composite signal.
  • the output current of the AC signal is detected at the timing of the detection signal period.
  • the detection processing unit 13a includes a detection preprocessing unit 131 and a detection unit 132.
  • the detection preprocessing unit 131 generates a first detection signal from the outputs of the Rogowski coils 11 (11-1, 11-2, 11-3), and the Rogowski coils 12 (12-1, 12-2, 12-3). A second detection signal is generated from the output of the above, and a composite signal obtained by adding the first detection signal and the second detection signal is generated.
  • the detection preprocessing unit 131 for example, detects the first embodiment shown in FIG. It is the same circuit as the processing unit 13.
  • the detection unit 132 is a part of the motor control unit 30a, and includes, for example, an ADC (not shown), and acquires a current value via the ADC.
  • the signals obtained by converting the current waveform into a voltage include a U-phase current signal UC, a V-phase current signal VC, a W-phase current signal WC, an input current signal BTC, a U-phase negative current signal UMC, and a V-phase negative current signal.
  • VMC, W phase negative current signal WMC and the like are included.
  • the detection unit 132 acquires (detects) the current values of the U-phase current signal UC, the V-phase current signal VC, and the W-phase current signal WC, for example, the detection unit 132 of the first detection signal before generating the combined signal.
  • the voltage during the period and the voltage during the period of the second detection signal the voltage during the period of the detection signal having the larger duty ratio that makes the switching elements (21, 22) conductive is acquired as a current value. That is, the detection unit 132 acquires the voltage during the period of the first detection signal and the voltage during the period of the second detection signal before generating the combined signal via the ADC, and the duty ratio during the period of the first detection signal. And the duty ratio during the period of the second detection signal are compared, and the larger voltage value is adopted as the current value.
  • the detection unit 132 conducts the switching elements (21, 22) in order to reduce the influence of ringing when acquiring the voltage during the period of the first detection signal and the voltage during the period of the second detection signal. At the middle part of the period of the state, get the voltage value.
  • the motor control unit 30a is a processor including, for example, a CPU, and controls the motor control device 1a in an integrated manner.
  • the motor control unit 30a controls switching between the switching element 21 and the switching element 22 based on the output current of the drive signal (alternating current signal) detected by the current detection device 10a.
  • the motor control unit 30a performs the same control as the motor control unit 30 of the first embodiment.
  • the motor control unit 30a includes a detection unit 132 which is a part of the detection processing unit 13a described above.
  • the basic operation of the current detection device 10a and the motor control device 1a according to this embodiment is the same as that of the first embodiment shown in FIGS. 7 to 9 described above. Since the process of step S104 shown in FIG. 7 is different in the present embodiment, the details of this process will be described with reference to FIG.
  • FIG. 12 is a flowchart showing an example of the output current detection process of the current detection device 10a according to the present embodiment. The process shown in this figure corresponds to the process of step S104 shown in FIG. 7.
  • the detection processing unit 13a of the current detection device 10a first detects the detection signal of the Rogowski coil 11 (High side) (step S401). That is, the detection unit 132 of the detection processing unit 13a acquires the voltage value of the central portion of the period of the first detection signal of the combined signal via the ADC (not shown).
  • the detection processing unit 13a first detects the detection signal of the Rogowski coil 12 (Low side) (step S401). That is, the detection unit 132 acquires the voltage value of the central portion of the period of the second detection signal of the combined signal via the ADC (not shown).
  • the detection unit 132 determines whether or not the duty (duty ratio) on the low side is larger than the duty (duty ratio) on the high side (step S403).
  • the detection unit 132 sets the process to step S404. Proceed. Further, the detection unit 132 performs processing when the Duty on the Low side (width of the conduction period of the switching element 22) is equal to or less than the Duty on the High side (width of the conduction period of the switching element 21) (step S403: NO). Proceed to step S405.
  • step S404 the detection unit 132 adopts the detection of the detection signal of the Rogowski coil 12 (Low side) as the detection value of the output current.
  • the detection unit 132 adopts the voltage value in the central portion of the period of the second detection signal of the combined signal as the detection value of the output current.
  • step S405 the detection unit 132 adopts the detection of the detection signal of the Rogowski coil 11 (High side) as the detection value of the output current.
  • the detection unit 132 adopts the voltage value in the central portion of the period of the first detection signal of the combined signal as the detection value of the output current.
  • the current detection device 10a executes the process shown in FIG. 12 described above for the U-phase current signal UC, the V-phase current signal VC, and the W-phase current signal WC as current signals indicating the output currents of each phase. To do.
  • the current detection device 10a has a switching element 21 (first switching element) and a switching element 22 (second switching element) connected in series, and generates an AC signal.
  • a current detection device that detects the current flowing through the inverter unit 20, the Rogowski coil 11 (first Rogowski coil), the Rogowski coil 12 (second Rogowski coil), and the detection processing unit 13a. To be equipped.
  • the Rogowski coil 11 detects the current flowing through the switching element 21.
  • the Rogowski coil 12 detects the current flowing through the switching element 22.
  • the detection processing unit 13a brings the switching elements (21, 22) of the first detection signal obtained by integrating the output of the Rogowski coil 11 and the second detection signal obtained by integrating the output of the Rogowski coil 12 into a conductive state.
  • the output current of the AC signal is detected based on the detection signal having the larger duty ratio.
  • the current detection device 10a according to the present embodiment uses the detection signal having the larger duty ratio (the one with the wider detection signal) of the first detection signal and the second detection signal to output the current. Therefore, the output current can be detected while avoiding the ringing occurrence period. Therefore, the current detection device 10a according to the present embodiment can reduce the influence of ringing and realize precise current detection.
  • the detection processing unit 13a generates a composite signal obtained by adding the first detection signal and the second detection signal, and of the composite signal, among the first detection signal and the second detection signal. , The output current of the AC signal is detected at the timing of the detection signal period with the larger duty ratio.
  • the current detection device 10a according to the present embodiment can generate a composite signal close to the actual waveform of the output current of the AC signal (drive signal), thus reducing the detection error of the current value due to insufficient resolution of the sampling cycle. can do. Therefore, the current detection device 10a according to the present embodiment can realize precise current detection by an inexpensive configuration having a low resolution of the sampling cycle, as in the first embodiment.
  • the motor control device 1a includes the above-mentioned current detection device 10a, an inverter unit 20, and a motor control unit 30a.
  • the inverter unit 20 supplies an AC signal as a drive signal to the motor 3.
  • the motor control unit 30a controls switching between the switching element 21 and the switching element 22 based on the output current detected by the current detection device 10a.
  • the motor control device 1a according to the present embodiment has the same effect as the current detection device 10a described above, can reduce the influence of ringing, and can realize precise current detection.
  • the current detection method is a current detection method that has a switching element 21 and a switching element 22 connected in series and detects a current flowing through an inverter unit 20 that generates an AC signal.
  • a generation step, a second generation step, and a detection processing step are included.
  • the detection processing unit 13a integrates the output of the Rogowski coil 11 that detects the current flowing through the switching element 21 to generate the first detection signal.
  • the detection processing unit 13a integrates the output of the Rogowski coil 12 that detects the current flowing through the switching element 22 to generate the second detection signal.
  • the detection processing unit 13a puts the switching element of the first detection signal generated by the first generation step and the second detection signal generated by the first generation step into a conductive state.
  • the output current of the AC signal is detected based on the detection signal having the larger duty ratio.
  • the current detection method according to the present embodiment has the same effect as the current detection device 10a and the motor control device 1a described above, reduces the influence of ringing, and can realize precise current detection.
  • FIG. 13 is a block diagram showing an example of the motor control device 1b and the current detection device 10b according to the third embodiment.
  • the motor control device 1b includes a current detection device 10b. Further, the current detection device 10b includes a detection processing unit 13b. Although not shown in FIG. 13, the motor control device 1b includes a motor control unit 30a, a DC power supply 2, a smoothing capacitor 4, and an inverter unit 20 similar to those in the second embodiment described above, and controls the motor. It is assumed that the unit 30a includes the detection unit 132a.
  • the detection processing unit 13b detects the output current of the AC signal at the timing of the period of the detection signal having the larger duty ratio of the first detection signal and the second detection signal.
  • the detection processing unit 13b includes a detection pre-processing unit 131a and a detection unit 132a.
  • the detection preprocessing unit 131a includes an integrator circuit 40-1 to an integrator circuit 40-6, and is a first detection signal (detection signal UH) from the output of the Rogowski coil 11 (11-1, 11-2, 11-3). , Detection signal VH, and detection signal WH). Further, the detection preprocessing unit 131a generates a second detection signal (detection signal UL, detection signal VL, and detection signal WL) from the output of the Rogowski coil 12 (12-1, 12-2, 12-3). To do.
  • the detection unit 132a replaces the combined signals (U-phase current signal UC, V-phase current signal VC, W-phase current signal WC) of the second embodiment with detection signals (detection signal UH, detection signal VH, detection signal WH). , Detection signal UL, detection signal VL, and detection signal WL), the same processing as that of the detection unit 132 is executed.
  • the detection unit 132a detects the output current of the AC signal at the timing of the period of the detection signal having the larger duty ratio of the first detection signal and the second detection signal.
  • the detection unit 132a acquires the voltage of the first detection signal and the voltage of the second detection signal via the ADC, and compares the duty ratio of the first detection signal with the duty ratio of the second detection signal. Then, the larger voltage value is adopted as the current value.
  • the first detection signal (detection signal UH, detection) is performed instead of the combined signal (U-phase current signal UC, V-phase current signal VC, W-phase current signal WC).
  • the detection processing unit 13b is the detection signal of the first detection signal and the second detection signal, whichever has the larger duty ratio.
  • the output current of the AC signal is detected at the timing of the period.
  • the current detection device 10 (10a, 10b) is included in the motor control device 1 (1a, 1b) and is applied to current detection for controlling the drive of the motor 3.
  • the current detection device 10 (10a, 10b) may be applied to the current detection of the inverter unit used other than the motor control device 1 (1a, 1b) such as the power supply device.
  • the detection processing unit 13 outputs a signal obtained by converting the current waveform into a voltage, and the motor control unit 30 acquires a current value via an ADC (not shown).
  • the signals obtained by converting the current waveform into a voltage include a U-phase current signal UC, a V-phase current signal VC, a W-phase current signal WC, an input current signal BTC, a U-phase negative current signal UMC, and a V-phase negative current signal. VMC, W phase negative current signal WMC and the like are included.
  • the detection processing unit 13 may include an ADC. That is, the detection processing unit 13 may have some functions of the motor control unit 30. Further, the motor control unit 30 may have a part or all of the functions of the detection processing unit 13.
  • the detection processing unit 13a (13b) includes the detection unit 132 (132a) included in the motor control unit 30a
  • the present invention is not limited thereto. Absent.
  • the detection unit 132 (132a) may be provided outside the motor control unit 30a. That is, the detection processing unit 13a (13b) may have some functions of the motor control unit 30a. Further, the motor control unit 30a may have a part or all of the functions of the detection processing unit 13a (13b).
  • the present invention is not limited to this, and the three-phase is not limited to this. It may be applied to applications of less than or more than 4 phases.
  • the detection processing unit 13 has been described as an example realized by hardware processing by a circuit such as an integrator circuit 40 and an adder (50, 51), but the present invention is limited to this.
  • a part or all of the functions of the detection processing unit 13 (13a, 13b) may be realized by software processing.
  • Each configuration included in the motor control device 1 (1a, 1b) described above has a computer system inside. Then, a program for realizing the functions of each configuration included in the motor control device 1 described above is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed. Therefore, the processing in each configuration provided in the motor control device 1 (1a, 1b) described above may be performed.
  • "loading and executing a program recorded on a recording medium into a computer system” includes installing the program in the computer system.
  • computer system as used herein includes hardware such as an OS and peripheral devices.
  • the "computer system” may include a plurality of computer devices connected via a network including a communication line such as the Internet, WAN, LAN, and a dedicated line.
  • the "computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system.
  • the recording medium in which the program is stored may be a non-transient recording medium such as a CD-ROM.
  • the recording medium also includes an internal or external recording medium that can be accessed from the distribution server to distribute the program.
  • a "computer-readable recording medium” is a volatile memory (RAM) inside a computer system that serves as a server or client when a program is transmitted via a network, and holds the program for a certain period of time. It shall also include things.
  • the above program may be for realizing a part of the above-mentioned functions. Further, it may be a so-called difference file (difference program) that can realize the above-mentioned function in combination with a program already recorded in the computer system.
  • a part or all of the above-mentioned functions may be realized as an integrated circuit such as an LSI (Large Scale Integration).
  • LSI Large Scale Integration
  • Each of the above-mentioned functions may be made into a processor individually, or a part or all of them may be integrated into a processor.
  • the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, when an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology, an integrated circuit based on this technology may be used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Inverter Devices (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Control Of Ac Motors In General (AREA)
PCT/JP2020/037574 2019-10-04 2020-10-02 電流検出装置、モータ制御装置、及び電流検出方法 Ceased WO2021066153A1 (ja)

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JP2021551486A JP7262604B2 (ja) 2019-10-04 2020-10-02 電流検出装置、モータ制御装置、及び電流検出方法
DE112020004749.0T DE112020004749T5 (de) 2019-10-04 2020-10-02 Stromerfassungsvorrichtung, motorsteuerungsvorrichtung undstromerfassungsverfahren
CN202080057159.0A CN114222926B (zh) 2019-10-04 2020-10-02 电流检测装置、电机控制装置及电流检测方法

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JP7309088B1 (ja) * 2022-06-23 2023-07-14 新電元工業株式会社 電流検出装置、及び電流検出方法
EP4657690A1 (fr) * 2024-05-30 2025-12-03 Safran Electrical & Power Dispositif de capacité pour un système de génération électrique d'un aéronef et procédé associé

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FR3162945A1 (fr) * 2024-05-30 2025-12-05 Safran Electrical & Power Dispositif de capacité pour un système de génération électrique d’un aéronef et procédé associé

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CN114222926B (zh) 2024-08-30
JPWO2021066153A1 (https=) 2021-04-08

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