WO2022168168A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- WO2022168168A1 WO2022168168A1 PCT/JP2021/003755 JP2021003755W WO2022168168A1 WO 2022168168 A1 WO2022168168 A1 WO 2022168168A1 JP 2021003755 W JP2021003755 W JP 2021003755W WO 2022168168 A1 WO2022168168 A1 WO 2022168168A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 96
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- 238000009499 grossing Methods 0.000 claims abstract description 20
- 230000005674 electromagnetic induction Effects 0.000 description 14
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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
- 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
- H02P27/08—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 with pulse width modulation
-
- 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
-
- 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
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
Definitions
- This disclosure relates to a power converter that supplies power to a connected load.
- a power conversion device is used to supply power to loads such as motors and to control their operation.
- loads such as motors and to control their operation.
- the position (angle) of the rotor in order to accurately control the motor, the position (angle) of the rotor must be accurately determined, and an inverter that converts DC voltage to AC voltage can be used to adjust the current of each phase of the motor. need to control.
- the inverter is a controller that adjusts the motor current by changing the voltage applied to each phase of the motor.
- PWM Pulse Width Modulation
- is used to adjust the voltage by adjusting the length of ON/OFF time of the pulse. method) is often used, and the effective value of the voltage applied to the motor is controlled by this ON/OFF time ratio.
- This control detects the current flowing in the motor and feeds it back to the PWM operation of the inverter. Therefore, if the detected current value used for control and the actual current value differ, the motor cannot be controlled correctly, causing NV (Noise Vibration) of the motor. ) may affect the properties.
- This disclosure has been made to solve the above-described problems. Even if an error voltage occurs in a current detection circuit due to electromagnetic induction, the error voltage is calculated from the operating state of the inverter, Since the current of the inverter can be detected with high accuracy by performing the correction, it is possible to obtain a power conversion device capable of suppressing an increase in the size of the inverter and improving the accuracy of motor control.
- a power conversion device is a power conversion device having one end connected to a DC voltage source and the other end connected to a load, wherein an upper arm and a lower arm each having a switching element and a resistor are connected in series.
- An inverter circuit which has a connected leg and a smoothing capacitor connected in parallel to the leg, converts the DC voltage from the DC voltage source to AC voltage and outputs it to the load, and detects the voltage across the resistor.
- a current detection circuit that detects the current flowing through the resistor and a control circuit that controls the inverter circuit, the control circuit correcting the current value detected by the current detection circuit based on the operating conditions of the inverter circuit, and correcting the current value.
- the inverter circuit is controlled based on the current value obtained.
- the power conversion device According to the power conversion device according to the present disclosure, it is possible to correct errors occurring in the current detection circuit without increasing the size of the circuit.
- FIG. 1 is a configuration diagram of a power converter according to Embodiment 1;
- FIG. 4 is a diagram illustrating an induced voltage to the current detection circuit according to Embodiment 1;
- FIG. 4 is a diagram for explaining back electromotive force generated in the inverter according to the first embodiment;
- FIG. 4 is a diagram for explaining gate driving and inverter current detection timing according to the first embodiment;
- FIG. 4 is a diagram for explaining the influence of an induced voltage that occurs in the current detection circuit according to Embodiment 1;
- 5 is a characteristic diagram showing the relationship between the error voltage of the current detection circuit obtained from the theoretical formula according to the first embodiment and the duty;
- FIG. 4 is a flowchart for determining whether or not correction is necessary according to the first embodiment;
- 3 is a diagram showing an example of a hardware configuration of a control circuit according to Embodiment 1;
- FIG. 1 is a configuration diagram showing a power converter and a motor system according to Embodiment 1.
- the motor system includes a DC voltage source 1, a power converter 2, and a motor 3 as a load.
- the DC voltage source 1 is a voltage source that outputs a DC voltage, and is, for example, a power storage device such as a battery, but it is needless to say that it is not limited to this.
- the power converter 2 has one end connected to the DC voltage source 1 and the other end connected to the motor 3 as a load.
- the power conversion device 2 converts the DC power from the DC voltage source 1 into AC power and outputs the AC power to the motor 3 to operate the motor.
- the motor 3 is used as the load is shown here, any load may be used.
- the power conversion device 2 is a three-phase inverter circuit including a smoothing capacitor 11, an inverter circuit 12, a current detection circuit 15, and a control circuit 17.
- a three-phase inverter device is shown, but the inverter circuit does not necessarily have to be three-phase, and may be a single-phase or four-phase or more inverter circuit.
- the smoothing capacitor 11 has one end connected to the positive side of the DC bus and the other end connected to the negative side of the DC bus, and is connected in parallel to each leg of the DC voltage source 1 and an inverter circuit 12 to be described later. .
- the inverter circuit 12 is a power conversion circuit that converts the DC voltage output from the DC voltage source 1 into an AC voltage and outputs the AC voltage, and includes three legs connected in parallel. Each leg has a configuration in which an upper arm and a lower arm having switching elements and a resistor are connected in series, and both ends of each leg are connected to both ends of a smoothing capacitor 11 and both ends of a DC voltage source 1 .
- switching element 13a, switching element 13b, and resistor 14a are connected in series
- switching element 13c, switching element 13d, and resistor 14b are connected in series
- switching element 13e, switching element 13f, and Resistors 14c are connected in series with each other.
- a connection point between the switching element 13a and the switching element 13b, a connection point between the switching element 13c and the switching element 13d, and a connection point between the switching element 13e and the switching element 13f are connected to the motor 3, respectively. supply current.
- a molded module of the inverter circuit 12 is called an inverter module.
- the current detection circuit 15 is a detection circuit that detects the voltage across the resistors 14a to 14c provided in each leg of the inverter circuit 12 to detect the current flowing through each resistor, and includes differential amplifiers 15a to 15c.
- a current detection line 16aH connected between the switching element 13b and the resistor 14a and a current detection line 16aL connected to the other end of the resistor 14a are connected to the differential amplifier 15a.
- the voltage generated across the resistor 14a is amplified while in-phase noise generated in the current detection line 16aL is cancelled.
- a current detection line 16bH connected between the switching element 13d and the resistor 14b and a current detection line 16bL connected to the other end of the resistor 14b are connected to the differential amplifier 15b.
- the voltage generated across the resistor 14b is amplified while in-phase noise generated in the line 16bH and the current detection line 16bL is cancelled.
- a current detection line 16cH connected between the switching element 13f and the resistor 14c and a current detection line 16cL connected to the other end of the resistor 14c are connected to the differential amplifier 15c.
- the voltage generated across the resistor 14c is amplified while in-phase noise generated in the current detection line 16cH and the current detection line 16cL is cancelled.
- the electric power converter shown in FIG. 1 showed the structure which provides a current detection circuit in all the three legs, it does not necessarily need to be provided in all the legs.
- the control circuit 17 is a control circuit that controls the switching operation of the inverter circuit 12, and controls the inverter circuit 12 based on the current value detected by the current detection circuit 15 and the information on the magnetic pole position and rotation speed of the motor 3. .
- the control circuit 17 also includes an error correction circuit 171 that corrects the current value detected by the current detection circuit 15 based on the operating state of the inverter circuit 12, and compares the current value corrected by the error correction circuit 171 with the current command value. It includes a comparison calculation unit 172 that calculates and generates a duty command value, and a gate drive signal generation unit 173 that generates gate drive timing of the inverter circuit 12 from the duty command value.
- the control circuit 17 selects an inverter based on the voltage of the DC voltage source 1, which is the input voltage of the inverter circuit 12, a motor rotation speed command value and a torque command value from a host controller (not shown), and the magnetic pole position and rotation speed of the motor 3.
- a current command value for the circuit 12 is generated.
- the error correction circuit 171 the operation state of the inverter circuit 12 (for example, the current command value and the duty command value from the comparison calculation unit 172) is input, the current detection error amount is calculated, and the current detected by the current detection circuit 15 is calculated.
- a corrected current value is generated by correcting the current detection error amount for the value, and is output to the comparison calculation unit 172 .
- a comparison calculation unit 172 compares and calculates the current command value and the corrected current from the error correction circuit 171 to generate a duty command value.
- the gate drive signal generator 173 generates a gate drive signal for driving the inverter circuit 12 based on the duty command value generated by the comparator 172 .
- the control circuit 17 may be configured by hardware or may be configured by software. When configured by hardware, a combination of known controllers, arithmetic circuits, and the like may be used. Moreover, when configured by software, for example, as shown in FIG. 8, a processor and memory can be used in combination, and the processor executes a control program input from the memory.
- the motor 3 is an example of a load that is connected to the output end of the power conversion device 2 and operates by being supplied with AC power from the power conversion device 2 .
- the motor 3 has a mechanism for measuring the magnetic pole position, that is, the position (angle) of the rotor provided inside, and the number of revolutions, and outputs information on the measured magnetic pole position and number of revolutions to the control circuit 17. .
- the magnetic pole position and the number of revolutions do not have to be measured values, and may be calculated from estimated values or command values.
- FIG. FIG. 2 shows a model of electromagnetic interference to the current detection circuit, taking as an example a leg composed of an upper-arm switching element 13a, a lower-arm switching element 13b, and a resistor 14a. Since the other leg models are the same, only the leg consisting of the upper arm switching element 13a, the lower arm switching element 13b, and the resistor 14a will be described here.
- the electromagnetic interference model shown in FIG. 2 is generated across the resistor 14a when the switching element 13a of the upper arm is switched from on to off, the current of the motor 3 is circulated to the lower arm, and the switching element 13b is switched on. A state in which the current of each phase of the inverter circuit 12 is detected from the voltage is shown.
- FIG. 2A shows a state in which the switching element 13a of the upper arm is turned on, and the current path passes from the positive electrode side of the smoothing capacitor 11 through the switching element 13a of the upper arm to the smoothing capacitor 11 via the motor 3.
- FIG. to the negative side of FIG. 2(b) shows a state in which the upper arm switching element 13a is turned off from the state shown in FIG. 2(a).
- loop inductance L1 the inductance of the loop circuit from the smoothing capacitor 11 through the switching elements 13a and 13b and the resistor 14a to the other end of the smoothing capacitor. Since a mutual inductance MH exists between the current detection line 16aH and the current detection line 16aH, an induced voltage is generated in the current detection line 16aH by electromagnetic induction. Similarly, since a mutual inductance ML exists between the loop inductance L1 and the current detection line 16aL, an induced voltage is generated in the current detection line 16aL by electromagnetic induction.
- the mutual inductance MH and the mutual inductance ML are not equal, the absolute values of the induced voltages generated in the same phase are different and are not ideally canceled by the differential amplifier 15a, resulting in an error voltage. That is, the voltage generated from the smoothing capacitor 11 to the circuit composed of the inductance and resistance of the open circuit composed of the switching elements 13a and 13b and the resistor 14a is electromagnetically induced by the mutual inductance M and input to the differential amplifier. (Fig. 2(c)).
- L1 is the inductance of the loop circuit composed of the switching elements 13a and 13b and the resistor 14a from the smoothing capacitor 11
- Vin is the voltage generated in the circuit
- the loop circuit from the smoothing capacitor 11 to the switching devices 13a and 13b and the current detection line
- Vout be the output voltage generated by the electromagnetic induction of the differential amplifier 15a with a gain of 1, that is, the error voltage.
- the mutual inductance M between the current detection lines 16aH and 16aL and the inductance L1 of the loop circuit composed of the smoothing capacitor 11, the switching elements 13a and 13b, and the resistor 14c is determined by the physical arrangement and wiring of the inverter module. Since it is determined by the layout, if the influence of electromagnetic induction on the current detection circuit 15 can be obtained according to the operating state of the inverter, the current detection can be performed by correcting the current detection error in the current detection circuit 15 . As a result, the degree of freedom in designing the inverter module is improved, miniaturization can be achieved, and the controllability of the motor 3 can be improved since a more accurate current value is used.
- FIG. 3 shows an explanatory diagram of the back electromotive voltage generated in the inverter when the switching element 13a of the upper arm changes from on to off.
- a back electromotive force VR is generated to continuously flow the current to the motor 3.
- FIG. Motor current output from the inverter circuit 12 and flowing to the motor 3 is Imot
- resistance of the resistor 14a is R
- inductance of the motor 3 is L
- the current is detected from when the switching element 13a changes from on to off.
- the back electromotive voltage VR can be expressed by Equation (2).
- the motor current Imot is the output current from the inverter circuit 12 or the measured value of the current flowing through the motor 3, the current command value calculated by the control circuit 17 (or the current command value multiplied by a certain coefficient). or other).
- the peak of the back electromotive voltage is proportional to the motor current Imot and the resistance value of the resistor 14a, and the time response is such that the larger the resistance value of the resistor 14a and the smaller the inductance of the motor 3, the smaller the fluctuation convergence.
- a motor has a large inductance in order to obtain an electromagnetic force, and a resistor is configured to have a small resistance value from the viewpoint of suppressing heat generation. It is not affected by the current detection timing as explained in FIG.
- this counter-electromotive voltage is a voltage change to the motor and at the same time a voltage change to a circuit from the smoothing capacitor 11 to the switching elements 13a and 13b and the resistor 14a. Since it is a parasitic inductance of wiring composed of a lead frame or the like, it is very small. Since an induced voltage is generated in the current detection circuit 15 due to electromagnetic induction, the current detection value may be influenced by this. Therefore, the back electromotive voltage VR can be expressed as in Equation (3) using the loop inductance L1.
- Fig. 4 shows the relationship between the gate drive timing of the inverter circuit and the current detection timing.
- (a) shows the relationship between the triangular wave of the reference frequency and the magnitude of the duty command.
- (b) shows the gate drive timing of the switching element 13a in the upper arm of the inverter when the duty command is small
- (c) shows the gate drive timing of the switching element 13a in the upper arm of the inverter when the duty command is large. showing the timing.
- the triangular wave of the reference frequency and the duty command are compared to generate the gate drive timing of the switching element 13a of the upper arm, and after the switching element 13a of the upper arm is turned off, the next peak timing of the triangular wave of the reference frequency is generated. It shows that current detection is performed at .
- FIG. 5 shows the current detection characteristics obtained by current conversion from the voltage across the resistor 14a in an ideal state and when a detection error voltage occurs in the current detection circuit 15 due to electromagnetic induction.
- FIG. 5 shows, as an example, a state in which 80 A is flowing through the inverter, and the ideal state is a square-wave current response.
- the back electromotive voltage is generated in the circuit from the smoothing capacitor 11 to the switching elements 13a and 13b and the resistor 14a, and the voltage response is affected by the electromagnetic induction in the current detection circuit 15, causing the current detection timing to change. It can be seen that there is a current error of about 6 A from the ideal current value of 80 A, which is 85.9 A at times.
- Equation (4) the error voltage Vout due to electromagnetic induction generated in the input to the differential amplifier 15a is expressed by Equation (4) using Equations (1) and (3).
- the error correction circuit 171 corrects the current value detected by the current detection circuit 15 based on the error voltage Vout obtained by Equation (4).
- the resistance value R of the resistor 14a, the open-loop inductance L1, and the mutual inductance M are values determined by circuit constants and physical layout, they can be set as predetermined coefficients.
- the error correction circuit 171 corrects the current value detected by the current detection circuit 15 based on the operating state of the inverter circuit 12, here the motor current Imot and the time t until the current detection timing.
- the comparison calculation unit 172 generates a duty command based on the corrected current value
- the gate drive signal generation unit 173 generates a gate drive signal based on the generated duty command to control the inverter circuit 12.
- the error correction circuit 171 is detected by the current detection circuit 15 based on the current command value and the duty command value. Correction of the current value can be performed. That is, in the present embodiment in which the load is the motor 3, the control circuit 17 controls the voltage of the DC voltage source 1, which is the input voltage of the inverter circuit 12, and the motor rotation speed command value and torque command from the host controller (not shown). , the current command value for the inverter circuit 12 calculated from the magnetic pole position and rotation speed of the motor 3, and 1/2 of the value obtained by taking the difference of the duty command value from the predetermined control cycle. The current value detected by the detection circuit 15 can be corrected.
- the case where the current is detected at the peak timing of the triangular wave is shown, but it goes without saying that the time t can be calculated from the duty command value even if the current is detected at other timings.
- the time t can be calculated from the duty command value even if the current is detected at other timings.
- the time t can be calculated from the duty command value even if the current is detected
- FIG. 6 shows the amount of deviation (current error) of the current value obtained using the experimental value obtained by the current detection circuit 15 and the present theoretical formula from the ideal state.
- the actual measurement value and the current error obtained from the theoretical formula are almost in agreement, confirming the validity of this theoretical formula.
- the error correction circuit 171 uses this current detection error to correct the current value obtained by the current detection circuit 15, so that the correct current value flowing through the motor 3 can be obtained, thereby improving the accuracy of motor control. becomes possible.
- FIG. 7 shows a judgment flow for judging whether correction of the current detection error in the control circuit 17 is necessary.
- the control circuit 17 includes the voltage of the DC voltage source 1 which is the input voltage of the inverter circuit 12, the motor rotation speed command value and the torque command value from the host control unit (not shown), the magnetic pole position of the motor 3 and the rotation speed.
- a current command value for the inverter circuit 12 is generated from the number and a duty command value is calculated from the current command value.
- the error correction circuit 171 does not perform current correction (step S101).
- the predetermined constant value is determined, for example, from the range of errors allowed in motor control.
- the error correction circuit 171 does not perform current correction (step S102).
- the predetermined constant value is determined, for example, from the range of errors allowed in motor control, as in step S101.
- the time t from when the upper arm switching element 13a is turned off to when the current detection circuit 15 detects the current is smaller than a predetermined constant value, the error correction circuit 171 detects the current. No correction is performed (step S103).
- the predetermined constant value is determined, for example, from the range of errors allowed in motor control, as in step S101.
- the leg composed of the switching elements 13a and 13b and the resistor 14a that constitute the inverter circuit 12, the corresponding differential amplifier 15a that constitutes the current detection circuit 15, and the current detection line.
- 16aH and 16aL have been described, the same applies to other legs (other phases), except that the current phases are different.
- the error voltage can be detected from the operating state of the inverter by performing the configuration and operation as described above.
- the current of the inverter can be detected with high accuracy. Therefore, it is possible to obtain a power conversion device capable of suppressing an increase in the size of the inverter and improving the accuracy of motor control.
- it is determined from the operating state whether the detection error is small and can be ignored, and if the detection error is small and can be ignored, the load on the control circuit is reduced by not correcting the value detected by the current detection circuit. making it possible to reduce
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Abstract
Description
本開示の実施の形態1に係る電力変換装置およびこの電力変換装置を用いたモータシステムについて、図面を用いて説明する。図1は、実施の形態1に係る電力変換装置およびモータシステムを示す構成図である。図1において、モータシステムは、直流電圧源1、電力変換装置2、および負荷としてのモータ3を備えている。直流電圧源1は、直流電圧を出力する電圧源であり、例えば、バッテリなどの蓄電装置であるが、これに限ったものではないことはいうまでもない。
Claims (7)
- 一端が直流電圧源に接続されるとともに他端に負荷が接続される電力変換装置であって、
それぞれスイッチング素子を有する上アームおよび下アーム、ならびに抵抗が直列に接続されたレグと、前記レグに並列に接続された平滑コンデンサとを有し、前記直流電圧源からの直流電圧を交流電圧に変換して前記負荷に出力するインバータ回路と、
前記抵抗の両端電圧を検出して前記抵抗に流れる電流を検出する電流検出回路と、
前記インバータ回路を制御する制御回路と、
を備え、
前記制御回路は、
前記インバータ回路の動作状態に基づいて前記電流検出回路により検出された電流値を補正し、補正した前記電流値に基づいて前記インバータ回路を制御する電力変換装置。 - 前記制御回路は、
前記負荷へ出力する電流に関する指令値である電流指令値と、前記スイッチング素子のデューティに関する指令値であるデューティ指令値と、に基づいて前記電流検出回路により検出された電流値を補正する、請求項1に記載の電力変換装置。 - 前記制御回路は、
前記平滑コンデンサ、前記上アーム、前記下アーム、および前記抵抗を有する一巡回路のインダクタンスである一巡インダクタンスと、
前記一巡回路と前記電流検出回路の電流検出線との相互インダクタンスと、
前記抵抗の抵抗値と、
に基づいてあらかじめ定められる係数を算出し、前記係数に基づいて前記電流検出回路により検出された電流値を補正し、補正した電流値に基づいて前記インバータ回路を制御する、請求項2に記載の電力変換装置。 - 前記負荷はモータであり、
前記制御回路は、
前記直流電圧源からの直流電圧、前記モータの磁極位置、前記モータの回転数、前記モータの回転数指令値、および前記モータのトルク指令値に基づいて、前記インバータ回路の電流指令値を生成し、生成した前記電流指令値があらかじめ定められた一定値以下の場合に、前記電流検出回路により検出した電流値の補正を行わない、請求項1~4のいずれか1項に記載の電力変換装置。 - 前記負荷はモータであり、
前記制御回路は、
前記直流電圧源からの直流電圧、前記モータの磁極位置、前記モータの回転数、前記モータの回転数指令値、および前記モータのトルク指令値に基づいて、前記インバータ回路の電流指令値を生成し、生成した前記電流指令値と前記電流検出回路により検出された電流値とに基づいてデューティ指令を生成し、生成した前記デューティ指令があらかじめ定められた一定値以下の場合に、前記電流検出回路により検出した電流値の補正を行わない、請求項1~5のいずれか1項に記載の電力変換装置。 - 前記制御回路は、
前記上アームのスイッチング素子が、オンからオフに切り替わった時から、前記電流検出回路が電流を検出するまでの時間があらかじめ定められた一定値以下の場合に、前記電流検出回路により検出した電流値の補正を行わない、請求項1~6のいずれか1項に記載の電力変換装置。
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CN202180092270.8A CN116802977A (zh) | 2021-02-02 | 2021-02-02 | 电力变换装置 |
JP2021536711A JP7136359B1 (ja) | 2021-02-02 | 2021-02-02 | 電力変換装置 |
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JP2003324985A (ja) * | 2002-04-26 | 2003-11-14 | Toyoda Mach Works Ltd | モータ制御装置 |
WO2019198496A1 (ja) * | 2018-04-12 | 2019-10-17 | 日本精工株式会社 | 電流検出装置及び電動パワーステアリング装置 |
WO2020115859A1 (ja) * | 2018-12-06 | 2020-06-11 | 三菱電機株式会社 | 回転機の制御装置および電動車両の制御装置 |
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JP4985395B2 (ja) * | 2005-03-29 | 2012-07-25 | 株式会社安川電機 | 電流制御装置とその電流オフセット補正方法 |
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JP2003324985A (ja) * | 2002-04-26 | 2003-11-14 | Toyoda Mach Works Ltd | モータ制御装置 |
WO2019198496A1 (ja) * | 2018-04-12 | 2019-10-17 | 日本精工株式会社 | 電流検出装置及び電動パワーステアリング装置 |
WO2020115859A1 (ja) * | 2018-12-06 | 2020-06-11 | 三菱電機株式会社 | 回転機の制御装置および電動車両の制御装置 |
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