JP2021040420A - Converter device, control method, and program - Google Patents

Abstract

To provide a converter device in which a current flows corresponding to difference in voltage between both ends of a reactor and capable of reducing distortion of an input current caused by distortion of a power supply voltage.SOLUTION: A converter device includes: a voltage detector unit for detecting a voltage waveform based on a voltage output from an AC power source, and including a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a differential amplifier, and a capacitor; and a control signal generation unit that compares the voltage waveform detected by the voltage detection unit with a reference voltage waveform to be a reference to generate a control signal for controlling the switching element based on comparison results.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to converter devices, control methods and programs.

Converter devices are used in various fields. Patent Document 1 describes a technique for applying a converter device to an air conditioner to reduce the size and simplification of the device.

Japanese Unexamined Patent Publication No. 2014-150622

By the way, in the motor drive device described in Patent Document 1, a current corresponding to the difference voltage across the reactor flows through the reactor in the converter device. Therefore, in the motor drive device described in Patent Document 1, the distortion of the input current becomes large due to the distortion of the power supply voltage.

Therefore, in a converter device in which a current flows according to the difference voltage across the reactor, such as a reactor in a converter device as described in Patent Document 1, the distortion of the input current caused by the distortion of the power supply voltage is reduced. There was a need for technology that could be used.

The present disclosure has been made to solve the above problems, and an object of the present invention is to provide a converter device, a control method, and a program capable of reducing distortion of an input current caused by distortion of a power supply voltage.

In order to solve the above problems, the converter device according to the present disclosure is a voltage detection unit that detects a voltage waveform based on a switching element and a voltage output by an AC power supply, and includes a first resistor, a second resistor, and a second resistor. A third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a differential amplifier, and a capacitor are provided, and the first resistor is provided. The first terminal is connected to one end of the AC power supply, the second terminal of the first resistance is connected to the first terminal of the third resistance and the first terminal of the fourth resistance, and the second resistance The first terminal is connected to the other end of the AC power supply, the second terminal of the second resistor is connected to the second terminal of the third resistor and the first terminal of the fifth resistor, and the fourth resistor is connected. The second terminal of the fifth resistor is connected to the first terminal of the sixth resistor and the forward rotation input terminal of the differential amplifier, and the second terminal of the fifth resistor is the difference between the first terminal of the seventh resistor and the above. It is connected to the inverting input terminal of the dynamic amplifier, the second terminal of the sixth resistor is connected to the voltage source for setting the bias, and the second terminal of the seventh resistor is connected to the first terminal of the eighth resistor. , The first terminal of the ninth resistance and the output terminal of the differential amplifier are connected, the second terminal of the eighth resistance is connected to the ground, and the second terminal of the ninth resistance is the first terminal of the capacitor. A voltage detection unit connected to a terminal and the second terminal of the capacitor is connected to the ground, the voltage waveform detected by the voltage detection unit, and a reference reference voltage waveform are compared, and based on the comparison result. A control signal generation unit that generates a control signal for controlling the switching element is provided.

The converter device according to the present disclosure is a voltage detection unit that detects a voltage waveform based on a switching element and a voltage output by an AC power supply, and is a first diode, a second diode, a third diode, and a first resistor. A second resistor and a capacitor are provided, the anode terminal of the first diode is connected to one end of the AC power supply, and the cathode terminal of the first diode is the cathode terminal of the second diode and the first resistor. The anode terminal of the second diode is connected to the other end of the AC power supply, the anode terminal of the third diode is connected to the ground, and the second terminal of the first resistor is connected to the first terminal of the above. The cathode terminal of the third diode, the first terminal of the second resistor, and the first terminal of the capacitor are connected, the second terminal of the second resistor is connected to the ground, and the second terminal of the capacitor is connected. The voltage detection unit connected to the ground, the voltage waveform detected by the voltage detection unit, and a reference reference voltage waveform are compared, and a control signal for controlling the switching element is generated based on the comparison result. It includes a control signal generator.

The control method by the converter device according to the present disclosure includes a switching element, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor. An eighth resistor, a ninth resistor, a differential amplifier, and a capacitor are provided, the first terminal of the first resistor is connected to one end of an AC power supply, and the second terminal of the first resistor is the third resistor. The first terminal of the second resistor is connected to the first terminal of the fourth resistor, the first terminal of the second resistor is connected to the other end of the AC power supply, and the second terminal of the second resistor is the third terminal. It is connected to the second terminal of the resistor and the first terminal of the fifth resistor, and the second terminal of the fourth resistor becomes the first terminal of the sixth resistor and the forward rotation input terminal of the differential amplifier. The second terminal of the fifth resistor is connected to the first terminal of the seventh resistor and the inverting input terminal of the differential amplifier, and the second terminal of the sixth resistor is for setting a bias. The second terminal of the seventh resistor is connected to a voltage source, the first terminal of the eighth resistor, the first terminal of the ninth resistor, and the output terminal of the differential amplifier are connected to the eighth resistor. A converter device including a voltage detection unit in which the second terminal of the resistor is connected to the ground, the second terminal of the ninth resistor is connected to the first terminal of the capacitor, and the second terminal of the capacitor is connected to the ground. The control method is based on detecting a voltage waveform based on the voltage output by the AC power supply, comparing the detected voltage waveform with a reference reference voltage waveform, and based on the comparison result. Includes generating control signals that control switching elements.

The control method by the converter device according to the present disclosure is a voltage detection unit that detects a voltage waveform based on a switching element and a voltage output by an AC power supply, and includes a first diode, a second diode, a third diode, and the like. A first resistor, a second resistor, and a capacitor are provided, the anode terminal of the first diode is connected to one end of the AC power supply, and the cathode terminal of the first diode is the cathode terminal of the second diode and the said. It is connected to the first terminal of the first resistor, the anode terminal of the second diode is connected to the other end of the AC power supply, the anode terminal of the third diode is connected to the ground, and the second of the first resistor. The terminals are connected to the cathode terminal of the third diode, the first terminal of the second resistor, and the first terminal of the capacitor, the second terminal of the second resistor is connected to the ground, and the first terminal of the capacitor is connected. It is a control method by a converter device including a voltage detection unit in which two terminals are connected to the ground, and detects a voltage waveform based on a diode output by the AC power supply, the detected voltage waveform, and a reference. The reference voltage waveform is compared with the reference voltage waveform, and a control signal for controlling the switching element is generated based on the comparison result.

The program according to the present disclosure includes a switching element, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor. A ninth resistor, a differential amplifier, and a capacitor are provided, the first terminal of the first resistor is connected to one end of an AC power supply, and the second terminal of the first resistor is the first terminal of the third resistor. , The first terminal of the second resistor is connected to the other end of the AC power supply, and the second terminal of the second resistor is the second terminal of the third resistor. The terminal is connected to the first terminal of the fifth resistor, the second terminal of the fourth resistor is connected to the first terminal of the sixth resistor, and the forward rotation input terminal of the differential amplifier. The second terminal of the fifth resistor is connected to the first terminal of the seventh resistor and the inverting input terminal of the differential amplifier, and the second terminal of the sixth resistor is connected to a voltage source for setting a bias. The second terminal of the seventh resistor is connected to the first terminal of the eighth resistor, the first terminal of the ninth resistor, and the output terminal of the differential amplifier, and the second terminal of the eighth resistor is connected. A computer of a converter device comprising a voltage detector with terminals connected to ground, a second terminal of the ninth resistor connected to a first terminal of a capacitor, and a second terminal of the capacitor connected to ground. A control signal that detects a voltage waveform based on the voltage output by the AC power supply, compares the detected voltage waveform with a reference reference voltage waveform, and controls the switching element based on the comparison result. To generate and execute.

The program according to the present disclosure is a voltage detection unit that detects a voltage waveform based on a switching element and a voltage output by an AC power supply, and includes a first diode, a second diode, a third diode, and a first resistor. A second resistor and a capacitor are provided, the anode terminal of the first diode is connected to one end of the AC power supply, and the cathode terminal of the first diode is the cathode terminal of the second diode and the first resistor. It is connected to the first terminal, the anode terminal of the second diode is connected to the other end of the AC power supply, the anode terminal of the third diode is connected to the ground, and the second terminal of the first resistor is the first. The cathode terminal of the three diode, the first terminal of the second resistor, and the first terminal of the capacitor are connected, the second terminal of the second resistor is connected to the ground, and the second terminal of the capacitor is the said. A computer of a converter device including a voltage detection unit connected to the ground detects a voltage waveform based on the voltage output by the AC power supply, and compares the detected voltage waveform with a reference reference voltage waveform. And to generate a control signal for controlling the switching element based on the comparison result.

According to the converter device, control method and program according to the present disclosure, it is possible to reduce the distortion of the input current caused by the distortion of the power supply voltage.

It is a figure which shows an example of the structure of the motor drive device by 1st Embodiment of this disclosure. It is a figure which shows an example of the structure of the voltage detection part by 1st Embodiment of this disclosure. It is a figure which shows an example of the structure of the zero cross detection part by 1st Embodiment of this disclosure. It is a figure which shows an example of the structure of the converter control part by 1st Embodiment of this disclosure. It is a figure for demonstrating the generation of a switching signal in 1st Embodiment of this disclosure. It is a figure for demonstrating the generation of a switching signal in 1st Embodiment of this disclosure. It is a figure which shows an example of the processing flow of the converter apparatus by 1st Embodiment of this disclosure. It is a figure which shows an example of the structure of the voltage detection part by 2nd Embodiment of this disclosure. It is a figure which shows an example of the structure of the waveform observation part by another embodiment of this disclosure. It is a schematic block diagram which shows the structure of the computer which concerns on at least one Embodiment.

<First Embodiment>
Hereinafter, embodiments will be described in detail with reference to the drawings.
The motor drive device according to the first embodiment of the present disclosure will be described.
(Composition of motor drive device)
FIG. 1 is a diagram showing a configuration of a motor drive device 1 according to the first embodiment of the present disclosure. The motor drive device 1 is a device that converts AC power from the AC power supply 4 into DC power, converts the DC power into three-phase AC power, and outputs the DC power to the compressor motor 20. As shown in FIG. 1, the motor drive device 1 includes a converter device 2 and an inverter device 3.

The converter device 2 is a device that converts AC power from the AC power supply 4 into DC power and outputs it to the inverter device 3. The converter device 2 includes a rectifier circuit 5, a switching circuit 10a, a switching circuit 10b, a smoothing capacitor 12, a converter control unit 15, and a voltage detection unit 30.
The rectifier circuit 5 includes an input terminal, a reference terminal on the input side, an output terminal, and a reference terminal on the output side. The potential of the reference terminal on the input side is a potential that serves as a reference for the potential at the input terminal. The potential of the reference terminal on the output side is a potential that serves as a reference for the potential at the output terminal. The rectifier circuit 5 converts the AC power input from the AC power supply 4 into DC power and outputs the AC power to the switching circuit 10a and the switching circuit 10b.

The switching circuit 10a causes a current flowing through the smoothing capacitor 12 to flow to generate a voltage input to the inverter device 3. The switching circuit 10a includes a reactor 6a, a diode 7a, and a switching element 8a.

The reactor 6a includes a first terminal and a second terminal.
The diode 7a includes an anode terminal and a cathode terminal.
The switching element 8a includes a first terminal, a second terminal, and a third terminal. The switching element 8a controls the current flowing from the second terminal to the third terminal by switching between the on state and the off state according to the signal received by the first terminal, and causes the switching circuit 10a. Change the value of the flowing current. Examples of the switching element 8a include a field effect transistor (FET), an IGBT (Insulated Gate Bipolar Transistor), and the like. When the switching element 8a is, for example, an nMOS transistor, the first terminal of the switching element 8a is a gate terminal, the second terminal is a source terminal, and the third terminal is a drain terminal.

Similar to the switching circuit 10a, the switching circuit 10b passes a current through the smoothing capacitor 12 to generate a voltage input to the inverter device 3. The switching circuit 10b includes a reactor 6b, a diode 7b, and a switching element 8b.

The reactor 6b includes a first terminal and a second terminal.
The diode 7b includes an anode terminal and a cathode terminal.
Similar to the switching element 8a, the switching element 8b includes a first terminal, a second terminal, and a third terminal. The switching element 8b controls the current flowing from the second terminal to the third terminal by switching between the on state and the off state according to the signal received by the first terminal, and causes the switching circuit 10b. Change the value of the flowing current. Examples of the switching element 8b include a field effect transistor and an IGBT. When the switching element 8b is, for example, an nMOS transistor, the first terminal of the switching element 8b is a gate terminal, the second terminal is a source terminal, and the third terminal is a drain terminal.

The smoothing capacitor 12 includes a first terminal and a second terminal. The smoothing capacitor 12 receives current from both the switching circuit 10a and the switching circuit 10b. That is, the voltage input to the inverter device 3 is determined by the sum of the current values flowing from both the switching circuit 10a and the switching circuit 10b to the smoothing capacitor 12.

The voltage detection unit 30 includes a first input terminal, a second input terminal, and an output terminal. The voltage detection unit 30 detects the input voltage that the AC power supply 4 inputs to the rectifier circuit 5.

For example, as shown in FIG. 2, the voltage detection unit 30 has resistors 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311 and diodes 312, 313, a differential amplifier 314, and a capacitor 315. To be equipped. The resistor 303 is a resistor for alleviating an unbalanced state of the differential input caused by element variation of the resistor. Further, the diodes 312 and 313 are elements for surge protection. For example, the diodes 312 and 313 are Zener diodes.

Each of the resistors 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311 and the capacitor 315 has a first terminal and a second terminal. Each of the diodes 312 and 313 includes an anode terminal and a cathode terminal. The differential amplifier 314 includes a forward rotation input terminal, an inverting input terminal, and an output terminal. The first terminal of the resistor 301 is connected to one end of the AC power supply 4. The second terminal of the resistor 301 is connected to the first terminal of the resistor 303 and the first terminal of the resistor 304. The first terminal of the resistor 302 is connected to the other end of the AC power supply 4. The second terminal of the resistor 302 is connected to the second terminal of the resistor 303 and the first terminal of the resistor 305. The second terminal of the resistor 304 is connected to the first terminal of the resistor 306 and the cathode terminal of the diode 313. The second terminal of the resistor 305 is connected to the first terminal of the resistor 307 and the cathode terminal of the diode 312. The second terminal of the resistor 306 is connected to the first terminal of the resistor 308 and the forward rotation input terminal of the differential amplifier 314. The second terminal of the resistor 307 is connected to the first terminal of the resistor 309 and the inverting input terminal of the differential amplifier 314. The second terminal of resistor 308 is connected to a voltage source for setting the bias. The second terminal of the resistor 309 is connected to the first terminal of the resistor 310, the first terminal of the resistor 311 and the output terminal of the differential amplifier 314. The second terminal of the resistor 310 is connected to the ground GND. The second terminal of the resistor 311 is connected to the first terminal of the capacitor 315 and the converter control unit 15. The anode terminal of the diode 312 is connected to the anode terminal of the diode 313 and the ground GND. The second terminal of the capacitor 315 is connected to the ground GND. In this case, the first terminal of the resistor 301 is the first input terminal of the voltage detection unit 30. Further, the first terminal of the resistor 302 is the second input terminal of the voltage detection unit 30. The first terminal of the capacitor 315 is the output terminal of the voltage detection unit 30.
The voltage detection unit 30 gives information on the detected input voltage to the converter control unit 15.

The converter control unit 15 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The converter control unit 15 receives input voltage information from the voltage detection unit 30 via the first input terminal and observes the input voltage waveform. The converter control unit 15 controls the switching circuit 10a via the first output terminal. Further, the converter control unit 15 controls 10b via the second output terminal.

The AC power supply 4 includes an output terminal and a reference terminal. The AC power supply 4 supplies AC power to the converter device 2.

The zero cross detection unit 17 includes a first input terminal, a second input terminal, and an output terminal. The zero-cross detection unit 17 detects the zero-cross point of the voltage output by the AC power supply 4 via the first input terminal and the second input terminal. The zero cross point indicates a time when the voltage output by the AC power supply 4 crosses zero volt, and that time becomes a reference time in the processing of the motor drive device 1. The zero-cross detection unit 17 generates a zero-cross signal including information on the zero-cross point.

For example, as shown in FIG. 3, the zero-cross detection unit 17 includes resistors 171 and 172, 173, capacitors 174, 177, diodes 175, and a photocoupler 176.
Each of the resistors 171 and 172, 173 and the capacitors 174 and 177 includes a first terminal and a second terminal. The diode 175 includes an anode terminal and a cathode terminal. The photocoupler 176 includes a first terminal, a second terminal, a third terminal, and a fourth terminal.

The first terminal of the resistor 173 is connected to the first terminal of the capacitor 174, the cathode terminal of the diode 175, the first terminal of the photocoupler 176, and one end of the AC power supply 4. The first terminal of the resistor 171 is connected to the other end of the AC power supply 4. The second terminal of the resistor 171 is connected to the first terminal of the resistor 172. The second terminal of the resistor 172 is connected to the second terminal of the resistor 173, the second terminal of the capacitor 174, the anode terminal of the diode 175, and the second terminal of the photocoupler 176. The third terminal of the photocoupler 176 is connected to the converter control unit 15. The fourth terminal of the photocoupler 176 is connected to the first terminal of the capacitor 177. The second terminal of the capacitor 177 is connected to the ground GND. In this case, the first terminal of the resistor 173 is the first input terminal of the zero cross detection unit 17. Further, the first terminal of the resistor 171 is the second input terminal of the zero cross detection unit 17. Further, the first terminal of the capacitor 177 is an output terminal of the zero cross detection unit 17.

The zero-cross detection unit 17 causes a current to flow to the output side when the voltage difference input to the photocoupler 176 becomes a predetermined voltage difference. Therefore, by designing the zero-cross detection unit 17 so that the current flows when the AC voltage input to the rectifier circuit 5 is 0 volt, the zero-cross point is detected every time the photocoupler 176 flows the current. ..
However, when the zero cross point is detected by using the photocoupler 176, the amount of change in the voltage amplitude per unit time changes when the amplitude of the AC voltage input to the rectifier circuit 5 changes, so that the detection timing of the zero cross point varies. Occurs. Further, when the amplitude of the AC voltage input to the rectifier circuit 5 changes, the unsaturated region changes. Therefore, the detection timing of the zero cross point varies.
The zero-cross detection unit 17 outputs a zero-cross signal to the converter control unit 15 via the output terminal.

The inverter device 3 is a device that converts the DC power output from the converter device 2 into three-phase AC power and outputs it to the compressor motor 20. The inverter device 3 includes a bridge circuit 18 and an inverter control unit 19.
As shown in FIG. 1, the bridge circuit 18 includes an input terminal, a first output terminal, a second output terminal, a third output terminal, and a reference terminal. The potential of the reference terminal is a potential that serves as a reference for the potential at each of the input terminal, the first output terminal, the second output terminal, and the third output terminal. The bridge circuit 18 includes switching elements 181, 182, 183, 184, 185, and 186. The bridge circuit 18 is configured by pairing switching elements 181 and 182, switching elements 183 and 184, and switching elements 185 and 186, respectively. Each of the switching elements 181 to 186 includes a first terminal, a second terminal, and a third terminal. Each of the switching elements 181 to 186 controls the current flowing from the second terminal to the third terminal by switching between the on state and the off state according to the signal received by the first terminal. Three-phase AC power for driving the compressor motor 20 is generated, and the generated three-phase AC power is output to the compressor motor 20. Examples of the switching elements 181, 182, 183, 184, 185, 186 include a power field effect transistor, an IGBT, and the like.

The inverter control unit 19 includes a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, a fifth output terminal, and a sixth output terminal. The first output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching between an on state and an off state of the switching element 181 to the first terminal of the switching element 181. The second output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching between an on state and an off state of the switching element 182 to the first terminal of the switching element 182. The third output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching between an on state and an off state of the switching element 183 to the first terminal of the switching element 183. The fourth output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching between an on state and an off state of the switching element 184 to the first terminal of the switching element 184. The fifth output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching between an on state and an off state of the switching element 185 to the first terminal of the switching element 185. The sixth output terminal of the inverter control unit 19 is a terminal for outputting a gate drive signal for switching between an on state and an off state of the switching element 186 to the first terminal of the switching element 186. In FIG. 1, the first to sixth output terminals of the inverter control unit 19 are omitted. Further, in FIG. 1, the gate drive signals output from the first to sixth output terminals of the inverter control unit 19 to the bridge circuit 18 are collectively shown as a gate drive signal Spwm. The inverter control unit 19 controls the opening and closing of the switching element in the bridge circuit 18. The inverter control unit 19 generates a gate drive signal Spwm of the switching elements 181 to 186, for example, based on a required rotation speed command input from a higher-level device (not shown). The inverter control unit 19 gives a gate drive signal Spwm to the bridge circuit 18 via the first to sixth output terminals. Specific examples of the inverter control method include vector control, sensorless vector control, V / F (Variable Frequency) control, overmodulation control, and 1-pulse control.

The input terminal of the rectifier circuit 5 is connected to the output terminal of the AC power supply 4, the first input terminal of the zero cross detection unit 17, and the first input terminal of the voltage detection unit 30. The input-side reference terminal of the rectifier circuit 5 is connected to the reference terminal of the AC power supply 4, the second input terminal of the zero-cross detection unit 17, and the second input terminal of the voltage detection unit 30. The output terminal of the rectifier circuit 5 is connected to the first terminal of the reactor 6a and the first terminal of the reactor 6b. The reference terminals on the output side of the rectifier circuit 5 are the third terminal of the switching element 8a, the third terminal of the switching element 8b, the second terminal of the smoothing capacitor 12, and the reference terminal of the inverter device 3 (switching elements 182, 184). 186, each of which is connected to the third terminal).
The second terminal of the reactor 6a is connected to the anode terminal of the diode 7a and the second terminal of the switching element 8a. The second terminal of the reactor 6b is connected to the anode terminal of the diode 7b and the second terminal of the switching element 8b.
The cathode terminal of the diode 7a is connected to the cathode terminal of the diode 7b, the first terminal of the smoothing capacitor 12, and the input terminal of the inverter device 3 (the second terminal of each of the switching elements 181, 183, and 185).
The first terminal of the switching element 8a is connected to the first output terminal of the converter control unit 15. The first terminal of the switching element 8b is connected to the second output terminal of the converter control unit 15.
The first terminal of the converter control unit 15 is connected to the output terminal of the voltage detection unit 30. The second terminal of the converter control unit 15 is connected to the output terminal of the zero cross detection unit 17.
The first terminal of the switching element 181 is connected to the first output terminal of the inverter control unit 19. The first terminal of the switching element 182 is connected to the second output terminal of the inverter control unit 19. The first terminal of the switching element 183 is connected to the third output terminal of the inverter control unit 19. The first terminal of the switching element 184 is connected to the fourth output terminal of the inverter control unit 19. The first terminal of the switching element 185 is connected to the fifth output terminal of the inverter control unit 19. The first terminal of the switching element 186 is connected to the sixth output terminal of the inverter control unit 19.
The third terminal of the switching element 181 is connected to the second terminal of the switching element 182 and the first terminal of the compressor motor 20. The third terminal of the switching element 183 is connected to the second terminal of the switching element 184 and the second terminal of the compressor motor 20. The third terminal of the switching element 185 is connected to the second terminal of the switching element 186 and the first terminal of the compressor motor 20.

When the inverter control unit 19 controls the opening and closing of the switching element in the bridge circuit 18 as described above, the DC voltage detection unit and the motor current detection unit are provided as described in Patent Document 1. May be done.
The DC voltage detection unit is a detection unit that detects the input DC voltage Vdc of the bridge circuit 18.
The motor current detection unit is a detection unit that detects the phase currents iu, iv, and iwa flowing through the compressor motor 20. The motor current detection unit inputs these detected values Vdc, iu, iv, and iwa into the inverter control unit 19. The motor current detection unit may detect the current flowing through the negative electrode side power line between the bridge circuit 18 and the smoothing capacitor 12, and acquire the phase currents iu, iv, and iwa from this detection signal.

FIG. 4 is a functional block diagram of the converter control unit 15.
As shown in FIG. 4, the converter control unit 15 includes a waveform observation unit 21, a control signal generation unit 22, and a storage unit 23.

The waveform observation unit 21 receives a zero-cross signal indicating the zero-cross point of the AC power supply 4 detected by the zero-cross detection unit 17 from the zero-cross detection unit 17. The waveform observation unit 21 receives an input voltage waveform from the voltage detection unit 30. The waveform observation unit 21 observes the input voltage waveform with reference to the zero cross point.

The control signal generation unit 22 generates a first switching signal Sg1 for controlling the switching circuit 10a and a second switching signal Sg2 for controlling the switching circuit 10b.
Specifically, the control signal generation unit 22 generates a predetermined triangular wave as shown in FIGS. 5A and 5C. The predetermined triangular wave is a signal having a waveform that serves as a reference when a control signal is generated from the input voltage waveform. Then, the control signal generation unit 22 compares the triangular wave with the input voltage waveform, and based on the comparison result, the first switching signal Sg1 that controls the switching element 8a as shown in FIGS. 5 (b) and 5 (d). And the second switching signal Sg2 that controls the switching element 8b is generated.
Specifically, the control signal generation unit 22 shows, for example, an input voltage waveform in which the third harmonic distortion is superimposed on the fundamental wave of the AC power supply 4 shown in FIG. 6 (a), as shown in FIG. 6 (b). When the reference waveform is larger than the input voltage waveform, a high level switching signal is generated, and when the reference waveform is less than or equal to the input voltage waveform, the absolute value is compared with the reference waveform (triangle wave). Generate a level switching signal. The control signal generation unit 22 generates the first switching signal Sg1 and the second switching signal Sg2 by using the input voltage waveform including the distortion of the input voltage that causes the input current distortion. Therefore, the first switching signal Sg1 and the second switching signal Sg2 reflect information about the input current distortion. The control signal generation unit 22 can cancel the distortion in the input current by controlling the switching element 8a with the first switching signal Sg1 and controlling the switching element 8b with the second switching signal Sg2.
The example of the input voltage waveform shown here shows the case where the third harmonic distortion is superimposed on the fundamental wave of the AC power supply 4, but in reality, the fifth harmonic, the seventh harmonic, and the ninth harmonic are used. Harmonic distortion such as the next harmonic is complicatedly superimposed and changes from moment to moment. The waveform in which the third harmonic distortion is superimposed on the fundamental wave of the AC power supply 4 shown in FIG. 5 is an extreme example in which there are many third harmonic distortion components, and is generally the third order with respect to the fundamental wave. The proportion of harmonic distortion components is lower than in this example. Therefore, the input voltage waveform is closer to the case of only the fundamental wave than the waveform shown in FIG.
The storage unit 23 stores various information necessary for the processing performed by the converter control unit 15.

(Processing of motor drive)
Next, the processing of the motor drive device 1 according to the first embodiment of the present disclosure will be described.
Here, the processing flow of the converter device 2 shown in FIG. 7 will be described.
The process of the converter device 2 shown in FIG. 7 is a process performed when an input current is flowing.

The zero-cross detection unit 17 detects the zero-cross point of the voltage output by the AC power supply 4 via the first input terminal and the second input terminal (step S1). The zero-cross detection unit 17 generates a zero-cross signal including information on the zero-cross point (step S2). The zero-cross detection unit 17 outputs a zero-cross signal to the converter control unit 15 via the output terminal.

The waveform observation unit 21 receives a zero-cross signal from the zero-cross detection unit 17. The waveform observation unit 21 identifies the zero cross point from the received zero cross signal (step S3). The waveform observation unit 21 receives an input voltage from the voltage detection unit 30 (step S4). The waveform observation unit 21 observes the input voltage waveform received with reference to the zero cross point. The waveform observation unit 21 outputs the observed input voltage waveform to the control signal generation unit 22. At this time, the input voltage waveform output by the waveform observation unit 21 to the control signal generation unit 22 includes information on the zero crossing point.

The control signal generation unit 22 generates a predetermined triangular wave as a reference waveform (step S5). The control signal generation unit 22 receives an input voltage waveform from the waveform observation unit 21. The control signal generation unit 22 compares the input voltage waveform with the triangular wave by matching the timing of the triangular wave generated with reference to the zero cross point included in the input voltage waveform and the input voltage waveform (step S6). The control signal generation unit 22 generates a first switching signal Sg1 for controlling the switching element 8a and a second switching signal Sg2 for controlling the switching element 8b based on the comparison result (step S7). Specifically, the control signal generation unit 22 generates a high level switching signal when the triangular wave is larger than the input voltage waveform. Further, the control signal generation unit 22 generates a Low level switching signal when the triangular wave is equal to or less than the input voltage waveform.
The control signal generation unit 22 outputs the generated first switching signal Sg1 to the switching element 8a. Further, the control signal generation unit 22 outputs the generated second switching element Sg2 to the switching element 8b.
The switching element 8a is turned on or off according to the first switching signal Sg1. Further, the switching element 8b is turned on or off according to the second switching signal Sg2.

(Action effect)
The motor drive device 1 according to the first embodiment of the present disclosure has been described above.
In the motor drive device 1 according to the first embodiment of the present disclosure, the control signal generation unit 22 (control unit) compares the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, the control signal generation unit 22 uses the input voltage waveform to compare the first switching signal and the second switching signal, which reflect the information about the input current distortion, with the input voltage waveform and the triangular wave serving as the reference waveform. It can be generated immediately depending on the result. The motor drive device 1 can reduce the distortion of the input current caused by the distortion of the power supply voltage by controlling the switching element by using the first switching signal and the second switching signal.

<Second Embodiment>
Next, the motor drive device according to the second embodiment of the present disclosure will be described.
(Composition of motor drive device)
The motor drive device 1 according to the second embodiment of the present disclosure includes a converter device 2 and an inverter device 3 in the same manner as the motor drive device 1 according to the first embodiment of the present disclosure shown in FIG.

The converter device 2 includes a rectifier circuit 5, a switching circuit 10a, a switching circuit 10b, a smoothing capacitor 12, a converter control unit 15, and a voltage detection unit 30.
The inverter device 3 includes a bridge circuit 18 and an inverter control unit 19.
However, the voltage detection unit 30 included in the motor drive device 1 according to the second embodiment of the present disclosure is different from the voltage detection unit 30 included in the motor drive device 1 according to the first embodiment of the present disclosure.

Here, the voltage detection unit 30 included in the motor drive device 1 according to the second embodiment of the present disclosure will be described.

As shown in FIG. 8, the voltage detection unit 30 includes, for example, diodes 321, 322, 323, resistors 324, 325, 326, and capacitors 327.
Each of the diodes 321, 322, and 323 includes an anode terminal and a cathode terminal. Each of the resistors 324, 325, 326 and the capacitor 327 includes a first terminal and a second terminal.

The anode terminal of the diode 321 is connected to one end of the AC power supply 4. The cathode terminal of the diode 321 is connected to the cathode terminal of the diode 322 and the first terminal of the resistor 324. The anode terminal of the diode 322 is connected to the other end of the AC power supply 4. The second terminal of the resistor 324 is connected to the first terminal of the resistor 325. The second terminal of the resistor 325 is connected to the cathode terminal of the diode 323, the first terminal of the resistor 326, the first terminal of the capacitor 327, and the converter control unit 15. The anode terminal of the diode 323 is connected to the ground GND. The second terminal of the resistor 326 is connected to the ground GND. The second terminal of the capacitor 327 is connected to the ground GND. In this case, the anode terminal of the diode 321 is the first input terminal of the voltage detection unit 30. Further, the anode terminal of the diode 322 is the second input terminal of the voltage detection unit 30. The first terminal of the capacitor 327 is the output terminal of the voltage detection unit 30.

(Action effect)
The motor drive device 1 according to the second embodiment of the present disclosure has been described above.
In the motor drive device 1 according to the second embodiment of the present disclosure, the control signal generation unit 22 (control unit) compares the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, the control signal generation unit 22 uses the input voltage waveform to compare the first switching signal and the second switching signal, which reflect the information about the input current distortion, with the input voltage waveform and the triangular wave serving as the reference waveform. It can be generated immediately depending on the result. The motor drive device 1 can reduce the distortion of the input current caused by the distortion of the power supply voltage by controlling the switching element by using the first switching signal and the second switching signal.

In the first and second embodiments of the present disclosure, the voltage detection unit 30 shows an example in which the voltage waveform at the input of the rectifier circuit 5 is detected as the input voltage waveform. However, in another embodiment of the present disclosure, the voltage detection unit 30 may detect a voltage waveform at the output of the rectifier circuit 5 as an input voltage waveform. When the voltage detection unit 30 detects a voltage waveform at the output of the rectifier circuit 5 as an input voltage waveform, the input voltage waveform becomes a half-wave waveform. In this case, the control signal generation unit 22 may repeatedly apply the switching signal generated during the period for detecting the half-wave waveform to the period during which the input voltage waveform is not detected, for example.

In another embodiment of the present disclosure, for example, the waveform observation unit 21 performs an FFT (Fast Foyer Transfer) calculation on the input voltage waveform, decomposes the input voltage signal for each frequency component, and then decomposes the input voltage signal into frequency components, and then inputs the input current distortion. A signal obtained by synthesizing only the signals of the frequency components to be corrected is output to the control signal generation unit 22. Then, the control signal generation unit 22 may generate a switching signal for a signal obtained by synthesizing only the signal of the frequency component to be corrected for the input current distortion.
Further, the waveform observation unit 21 may perform an FFT (Fast Fourier Transform) calculation or the like on the input voltage waveform, and effectively use the input voltage signal decomposed for each frequency component for processing other than distortion correction.

In the voltage detection unit 30 as shown in FIGS. 2 and 8 shown in the first and second embodiments of the present disclosure, the elements constituting the filter and the like actually propagate the signal between the input and output. There is a delay time. In another embodiment of the present disclosure, where the delay time affects the correction of input current distortion (ie, the delay time is not negligible), for example, as shown in FIG. 9, the waveform observation unit 21 May include a delay correction unit 210 that corrects the delay time of the voltage detection unit 30.
For example, the delay correction unit 210 receives the information indicating the zero cross point specified by the waveform observation unit 21 by the process of step S3. Further, instead of the process of step S4, the delay correction unit 210 receives the input voltage from the voltage detection unit 30. The delay correction unit 210 corrects the input voltage waveform received with reference to the zero cross point by the delay time by the voltage detection unit 30 (that is, in the correspondence between the input voltage waveform and the time, the time is corrected by the delay time. Make it faster). The waveform observation unit 21 outputs the input voltage waveform corrected by the delay correction unit 210 to the control signal generation unit 22. Then, the processing after step S5 may be performed.

In the first and second embodiments of the present disclosure, an example is shown in which the AC power supply 4 is a single-phase power supply, but in another embodiment of the present disclosure, the AC power supply 4 is a three-phase power supply. May be good.

The storage unit 23 and other storage units in each embodiment of the present disclosure may be provided anywhere within a range in which appropriate information is transmitted and received. In addition, a plurality of storage units 23 and other storage units may exist in a range in which appropriate information is transmitted and received, and data may be distributed and stored.

In the processing according to the embodiment of the present disclosure, the order of processing may be changed within the range in which appropriate processing is performed.

Each of the storage unit 23 and the storage device (including the register and the latch) in the embodiment of the present disclosure may be provided anywhere within a range in which appropriate information is transmitted and received. Further, each of the storage unit 23 and the storage device may exist in a plurality of units within a range in which appropriate information is transmitted and received, and the data may be distributed and stored.

Although the embodiment of the present disclosure has been described, the converter control unit 15, the inverter control unit 19, and other control devices described above may have a computer system inside. The process of the above-mentioned processing is stored in a computer-readable recording medium in the form of a program, and the above-mentioned processing is performed by the computer reading and executing this program. A specific example of a computer is shown below.
FIG. 10 is a schematic block diagram showing the configuration of a computer according to at least one embodiment.
As shown in FIG. 10, the computer 50 includes a CPU 60, a main memory 70, a storage 80, and an interface 90.
For example, each of the converter control unit 15, the inverter control unit 19, and other control devices described above is mounted on the computer 50. The operation of each processing unit described above is stored in the storage 80 in the form of a program. The CPU 60 reads a program from the storage 80, expands it into the main memory 70, and executes the above processing according to the program. Further, the CPU 60 secures a storage area corresponding to each of the above-mentioned storage units in the main memory 70 according to the program.

Examples of the storage 80 include HDD (Hard Disk Drive), SSD (Solid State Drive), magnetic disk, optical magnetic disk, CD-ROM (Compact Disk Read Only Memory), DVD-ROM (Digital Versaille Disk Read). , Semiconductor memory and the like. The storage 80 may be internal media directly connected to the bus of computer 50, or external media connected to computer 50 via an interface 90 or a communication line. When this program is distributed to the computer 50 via a communication line, the distributed computer 50 may expand the program in the main memory 70 and execute the above processing. In at least one embodiment, the storage 80 is a non-temporary tangible storage medium.

Further, the above program may realize a part of the above-mentioned functions. Further, the program may be a file that can realize the above-mentioned functions in combination with a program already recorded in the computer system, that is, a so-called difference file (difference program).

Although some embodiments of the present disclosure have been described, these embodiments are examples and do not limit the scope of the disclosure. These embodiments may be subject to various additions, various omissions, various replacements, and various modifications without departing from the gist of the disclosure.

<Additional notes>
The converter device 2 described in each embodiment of the present disclosure is grasped as follows, for example.

(1) The converter device 2 according to the first aspect is a voltage detection unit that detects a voltage waveform based on a switching element (8a, 8b) and a voltage output by an AC power supply 4, and includes a first resistor 301 and a first resistor 301. The second resistance 302, the third resistance 303, the fourth resistance (304, 306), the fifth resistance (305, 307), the sixth resistance 308, the seventh resistance 309, the eighth resistance 310, and the like. A ninth resistor 311, a differential amplifier 314, and a capacitor 315 are provided, the first terminal of the first resistor 301 is connected to one end of the AC power supply 4, and the second terminal of the first resistor 301 is the second terminal. The first terminal of the 3 resistance 303 and the 1st terminal of the 4th resistance (304, 306) are connected, and the 1st terminal of the 2nd resistance 302 is connected to the other end of the AC power supply 4, and the first The second terminal of the two-resistor 302 is connected to the second terminal of the third resistance 303 and the first terminal of the fifth resistance (305, 307), and the second terminal of the fourth resistance (304, 306). Is connected to the first terminal of the sixth resistor (308) and the forward rotation input terminal of the differential amplifier 314, and the second terminal of the fifth resistor (305, 307) is the seventh of the seventh resistor 309. One terminal and the inverting input terminal of the differential amplifier 314 are connected, the second terminal of the sixth resistor 308 is connected to a voltage source for setting a bias, and the second terminal of the seventh resistor 309 is connected. The first terminal of the eighth resistor 310, the first terminal of the ninth resistor 311 and the output terminal of the differential amplifier 314 are connected, and the second terminal of the eighth resistor 310 is connected to the ground. A voltage detection unit 30 in which the second terminal of the ninth resistor 311 is connected to the first terminal of the capacitor 315 and the second terminal of the capacitor 315 is connected to the ground, and the voltage detected by the voltage detection unit 30. A control signal generation unit 22 that compares a waveform with a reference voltage waveform as a reference and generates a control signal for controlling the switching elements (8a, 8b) based on the comparison result is provided.

In this converter device 2, the voltage detection unit 30 detects the voltage waveform. The control signal generation unit 22 compares the voltage waveform detected by the voltage detection unit 30 with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, when the voltage waveform detected by the voltage detection unit 30 is the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit 5, the control signal generation unit 22 uses the input voltage waveform to measure the input current distortion. The first switching signal and the second switching signal to which the information is reflected can be immediately generated according to the comparison result between the input voltage waveform and the triangular wave serving as the reference waveform. The converter device 2 controls the switching elements (8a, 8b) by using the first switching signal and the second switching signal to reduce the distortion of the input current caused by the distortion of the power supply voltage (AC power supply 4). Can be done.

(2) The converter device 2 according to the second aspect is the converter device 2 of (1), and the voltage detection unit 30 is a half-wave voltage waveform after rectification of the voltage output by the AC power supply 4. The control signal generation unit 22 generates the control signal based on the comparison result compared with the period during which the voltage detection unit 30 detects the voltage waveform after the rectification, and generates the control signal. It is output to the switching element (8a, 8b) during the period when the voltage waveform after the rectification becomes 0 following the period during which the voltage waveform after the rectification is detected.

As a result, the control signal generation unit 22 can generate the first switching signal and the second switching signal every short period of half a wave after rectification. The converter device 2 can reduce the distortion of the input current caused by the distortion of the power supply voltage by controlling the switching elements (8a, 8b) by using the first switching signal and the second switching signal.

(3) The converter device 2 according to the third aspect is a switching element (8a, 8b), a voltage detection unit 30 that detects a voltage waveform based on the voltage output by the AC power supply 4, and a first diode 321. The second diode 322, the third diode 323, the first resistor (324, 325), the second resistor 326, and the capacitor 327 are provided, and the anode terminal of the first diode 321 is one end of the AC power supply 4. The cathode terminal of the first diode 321 is connected to the cathode terminal of the second diode 322 and the first terminal of the first resistor (324, 325), and the anode terminal of the second diode 322 is connected to. It is connected to the other end of the AC power supply 4, the anode terminal of the third diode 323 is connected to the ground, and the second terminal of the first resistor (324, 425) is the cathode terminal of the third diode 323 and the above. The first terminal of the second resistor 326 and the first terminal of the capacitor 327 are connected, the second terminal of the second resistor 326 is connected to the ground, and the second terminal of the capacitor 327 is connected to the ground. The voltage detection unit 30 compares the voltage waveform detected by the voltage detection unit 30 with a reference reference voltage waveform, and a control signal for controlling the switching element (8a, 8b) is generated based on the comparison result. A control signal generation unit 22 for generating is provided.

In this converter device 2, the voltage detection unit 30 detects the voltage waveform. The control signal generation unit 22 compares the voltage waveform detected by the voltage detection unit 30 with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, when the voltage waveform detected by the voltage detection unit 30 is the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit 5, the control signal generation unit 22 uses the input voltage waveform to measure the input current distortion. The first switching signal and the second switching signal to which the information is reflected can be immediately generated according to the comparison result between the input voltage waveform and the triangular wave serving as the reference waveform. The converter device 2 controls the switching elements (8a, 8b) by using the first switching signal and the second switching signal to reduce the distortion of the input current caused by the distortion of the power supply voltage (AC power supply 4). Can be done.

(4) The converter device 2 according to the fourth aspect is the converter device 2 according to any one of (1) to (3), and is a zero-cross detection unit that detects a zero-cross point of the voltage output by the AC power supply 4. 17 and a delay correction unit 210 that corrects the delay of the voltage waveform generated by the voltage detection unit 30 based on the zero cross point.

In this converter device 2, the delay correction unit 210 corrects the delay of the voltage waveform generated by the voltage detection unit 30 based on the zero cross point detected by the zero cross detection unit 17. As a result, the converter device 2 can correct the input current distortion with higher accuracy than the converter devices 2 of (1) to (3).

(5) The control method by the converter device 2 according to the fifth aspect is a voltage detection unit that detects a voltage waveform based on the voltage output by the switching element (8a, 8b) and the AC power supply 4, and is a first resistor. 301, 2nd resistance 302, 3rd resistance 303, 4th resistance (304, 306), 5th resistance (305, 307), 6th resistance 308, 7th resistance 309, 8th resistance A 310, a ninth resistor 311 and a differential amplifier 314 and a capacitor 315 are provided, the first terminal of the first resistor 301 is connected to one end of the AC power supply 4, and the second terminal of the first resistor 301 is connected. Is connected to the first terminal of the third resistor 303 and the first terminal of the fourth resistor (304, 306), and the first terminal of the second resistor 302 is connected to the other end of the AC power supply 4. The second terminal of the second resistor 302 is connected to the second terminal of the third resistor 303 and the first terminal of the fifth resistor (305, 307), and the fourth resistor (304, 306) has a second terminal. The second terminal is connected to the first terminal of the sixth resistor (308) and the forward rotation input terminal of the differential amplifier 314, and the second terminal of the fifth resistor (305, 307) is the seventh resistor. The first terminal of the 309 and the inverting input terminal of the differential amplifier 314 are connected, the second terminal of the sixth resistor 308 is connected to a voltage source for setting a bias, and the seventh resistor 309 has a first terminal. Two terminals are connected to the first terminal of the eighth resistor 310, the first terminal of the ninth resistor 311 and the output terminal of the differential amplifier 314, and the second terminal of the eighth resistor 310 is grounded. A control method by a converter device 2 including a voltage detection unit 30 which is connected, the second terminal of the ninth resistor 311 is connected to the first terminal of the capacitor 315, and the second terminal of the capacitor 315 is connected to the ground. The switching element is detected by detecting a voltage waveform based on the voltage output by the AC power supply 4, comparing the detected voltage waveform with a reference reference voltage waveform, and based on the comparison result. Includes generating a control signal to control (8a, 8b).

According to the control method by the converter device 2, the voltage detection unit 30 detects the voltage waveform in the converter device 2. The control signal generation unit 22 compares the voltage waveform detected by the voltage detection unit 30 with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, when the voltage waveform detected by the voltage detection unit 30 is the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit 5, the control signal generation unit 22 uses the input voltage waveform to measure the input current distortion. The first switching signal and the second switching signal to which the information is reflected can be immediately generated according to the comparison result between the input voltage waveform and the triangular wave serving as the reference waveform. The converter device 2 controls the switching elements (8a, 8b) by using the first switching signal and the second switching signal to reduce the distortion of the input current caused by the distortion of the power supply voltage (AC power supply 4). Can be done.

(6) The control method by the converter device 2 according to the sixth aspect is a voltage detection unit 30 that detects a voltage waveform based on the voltage output by the switching element (8a, 8b) and the AC power supply 4, and is the first. A diode 321 is provided, a second diode 322, a third diode 323, a first resistor (324, 325), a second resistor 326, and a capacitor 327 are provided, and the anode terminal of the first diode 321 is the AC power supply. It is connected to one end of the first diode 321 and the cathode terminal of the first diode 321 is connected to the cathode terminal of the second diode 322 and the first terminal of the first resistor (324, 325). The anode terminal is connected to the other end of the AC power supply 4, the anode terminal of the third diode 323 is connected to the ground, and the second terminal of the first resistor (324, 425) is the cathode terminal of the third diode 323. , The first terminal of the second resistor 326 and the first terminal of the capacitor 327 are connected, the second terminal of the second resistor 326 is connected to the ground, and the second terminal of the capacitor 327 is the ground. It is a control method by a converter device 2 including a diode detection unit 30 connected to the detection of a voltage waveform based on the voltage output by the AC power supply 4, the detected voltage waveform, and a reference reference. It includes comparing with a voltage waveform and generating a control signal for controlling the switching element (8a, 8b) based on the comparison result.

According to the control method by the converter device 2, the voltage detection unit 30 detects the voltage waveform in the converter device 2. The control signal generation unit 22 compares the voltage waveform detected by the voltage detection unit 30 with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, when the voltage waveform detected by the voltage detection unit 30 is the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit 5, the control signal generation unit 22 uses the input voltage waveform to measure the input current distortion. The first switching signal and the second switching signal to which the information is reflected can be immediately generated according to the comparison result between the input voltage waveform and the triangular wave serving as the reference waveform. The converter device 2 controls the switching elements (8a, 8b) by using the first switching signal and the second switching signal to reduce the distortion of the input current caused by the distortion of the power supply voltage (AC power supply 4). Can be done.

(7) The program according to the seventh aspect is a voltage detection unit that detects a voltage waveform based on the voltage output by the switching element (8a, 8b) and the AC power supply 4, the first resistor 301, and the second. Resistance 302, 3rd resistance 303, 4th resistance (304, 306), 5th resistance (305, 307), 6th resistance 308, 7th resistance 309, 8th resistance 310, 9th A resistor 311, a differential amplifier 314, and a capacitor 315 are provided, the first terminal of the first resistor 301 is connected to one end of the AC power supply 4, and the second terminal of the first resistor 301 is the third resistor. The first terminal of 303 and the first terminal of the fourth resistor (304, 306) are connected, the first terminal of the second resistor 302 is connected to the other end of the AC power supply 4, and the second resistor is connected. The second terminal of 302 is connected to the second terminal of the third resistor 303 and the first terminal of the fifth resistor (305, 307), and the second terminal of the fourth resistor (304, 306) is said. The first terminal of the sixth resistor (308) and the forward rotation input terminal of the differential amplifier 314 are connected, and the second terminal of the fifth resistor (305, 307) is the first terminal of the seventh resistor 309. And the inverting input terminal of the differential amplifier 314, the second terminal of the sixth resistor 308 is connected to the voltage source for setting the bias, and the second terminal of the seventh resistor 309 is the second terminal. The first terminal of the 8th resistor 310, the 1st terminal of the 9th resistor 311 and the output terminal of the differential amplifier 314 are connected, and the 2nd terminal of the 8th resistor 310 is connected to the ground. 9 The AC power supply 4 is supplied to the computer of the converter device 2 including the voltage detection unit 30 in which the second terminal of the resistor 311 is connected to the first terminal of the capacitor 315 and the second terminal of the capacitor 315 is connected to the ground. Detects a voltage waveform based on the voltage output by, compares the detected voltage waveform with a reference reference voltage waveform, and controls the switching element (8a, 8b) based on the comparison result. Generate a control signal and execute.

By this program, the voltage detection unit 30 detects the voltage waveform in the converter device 2. The control signal generation unit 22 compares the voltage waveform detected by the voltage detection unit 30 with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, when the voltage waveform detected by the voltage detection unit 30 is the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit 5, the control signal generation unit 22 uses the input voltage waveform to measure the input current distortion. The first switching signal and the second switching signal to which the information is reflected can be immediately generated according to the comparison result between the input voltage waveform and the triangular wave serving as the reference waveform. The converter device 2 controls the switching elements (8a, 8b) by using the first switching signal and the second switching signal to reduce the distortion of the input current caused by the distortion of the power supply voltage (AC power supply 4). Can be done.

(8) The program according to the eighth aspect is the switching element (8a, 8b) and the voltage detection unit 30 for detecting the voltage waveform based on the voltage output by the AC power supply 4, the first diode 321 and the first diode 321. A two-diode 322, a third diode 323, a first resistor (324, 325), a second resistor 326, and a capacitor 327 are provided, and the anode terminal of the first diode 321 is connected to one end of the AC power supply 4. The cathode terminal of the first diode 321 is connected to the cathode terminal of the second diode 322 and the first terminal of the first resistor (324, 325), and the anode terminal of the second diode 322 is the AC. It is connected to the other end of the power supply 4, the anode terminal of the third diode 323 is connected to the ground, and the second terminal of the first resistor (324, 425) is the cathode terminal of the third diode 323 and the second terminal. A diode that is connected to the first terminal of the resistor 326 and the first terminal of the capacitor 327, the second terminal of the second resistor 326 is connected to the ground, and the second terminal of the capacitor 327 is connected to the ground. The computer of the converter device 2 including the detection unit 30 detects a voltage waveform based on the voltage output by the AC power supply 4, and compares the detected voltage waveform with a reference reference voltage waveform. , To generate a control signal for controlling the switching elements (8a, 8b) based on the comparison result, and to execute.

By this program, the voltage detection unit 30 detects the voltage waveform in the converter device 2. The control signal generation unit 22 compares the voltage waveform detected by the voltage detection unit 30 with the triangular wave serving as the reference waveform. The control signal generation unit 22 generates a first switching signal and a second switching signal based on the comparison result.
Input current distortion is caused by distortion of the input voltage waveform. Therefore, when the voltage waveform detected by the voltage detection unit 30 is the input voltage waveform supplied from the AC power supply 4 to the rectifier circuit 5, the control signal generation unit 22 uses the input voltage waveform to measure the input current distortion. The first switching signal and the second switching signal to which the information is reflected can be immediately generated according to the comparison result between the input voltage waveform and the triangular wave serving as the reference waveform. The converter device 2 controls the switching elements (8a, 8b) by using the first switching signal and the second switching signal to reduce the distortion of the input current caused by the distortion of the power supply voltage (AC power supply 4). Can be done.

1 ... Motor drive device 2 ... Converter device 3 ... Inverter device 4 ... AC power supply 5 ... Rectifier circuits 6a, 6b ... Reactors 7a, 7b, 175, 312, 313, 321 322, 323 ... Diodes 8a, 8b ... Switching elements 10a, 10b ... Switching circuit 12 ... Smoothing capacitor 15 ... Converter control unit 17 ... Zero cross detection unit 21 ... Waveform observation unit 22 ... Control signal generation unit 23 ... Storage unit 30 ... Voltage detection unit 50 ... Computer 60 ... CPU
70 ... Main memory 80 ... Storage 90 ... Interfaces 171, 172, 173, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 324, 325, 326.・ ・ Resistance 174, 177, 315, 327 ・ ・ ・ Capacitor 176 ・ ・ ・ Photocoupler 314 ・ ・ ・ Differential amplifier Lp ・ ・ ・ Positive electrode bus

Claims (8)

Switching element and
It is a voltage detector that detects a voltage waveform based on the voltage output by an AC power supply, and is a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and so on. A seventh resistor, an eighth resistor, a ninth resistor, a differential amplifier, and a capacitor are provided, the first terminal of the first resistor is connected to one end of the AC power supply, and the second resistor of the first resistor is connected. The terminal is connected to the first terminal of the third resistor and the first terminal of the fourth resistor, the first terminal of the second resistor is connected to the other end of the AC power supply, and the second of the second resistor. Two terminals are connected to the second terminal of the third resistor and the first terminal of the fifth resistor, and the second terminal of the fourth resistor is the first terminal of the sixth resistor and the differential amplifier. It is connected to the forward rotation input terminal, the second terminal of the fifth resistor is connected to the first terminal of the seventh resistor and the inverting input terminal of the differential amplifier, and the second terminal of the sixth resistor is connected. It is connected to a voltage source for setting the bias, and the second terminal of the seventh resistor becomes the first terminal of the eighth resistor, the first terminal of the ninth resistor, and the output terminal of the differential amplifier. Voltage detection connected, the second terminal of the eighth resistor is connected to the ground, the second terminal of the ninth resistor is connected to the first terminal of the capacitor, and the second terminal of the capacitor is connected to the ground. Department and
A control signal generation unit that compares the voltage waveform detected by the voltage detection unit with a reference reference voltage waveform and generates a control signal for controlling the switching element based on the comparison result.
A converter device equipped with. The voltage detection unit
The half-wave voltage waveform after rectification of the voltage output by the AC power supply is detected, and the voltage waveform is detected.
The control signal generation unit
The control signal is generated based on the comparison result compared with the period in which the voltage detection unit detects the voltage waveform after the rectification, and the generated control signal follows the period in which the voltage waveform after the rectification is detected. Output to the switching element during the period when the voltage waveform after rectification becomes 0.
The converter device according to claim 1. Switching element and
It is a voltage detection unit that detects a voltage waveform based on the voltage output by an AC power supply, and includes a first diode, a second diode, a third diode, a first resistor, a second resistor, and a capacitor. The anode terminal of the first diode is connected to one end of the AC power supply, the cathode terminal of the first diode is connected to the cathode terminal of the second diode and the first terminal of the first resistor, and the second terminal is connected. The anode terminal of the diode is connected to the other end of the AC power supply, the anode terminal of the third diode is connected to the ground, and the second terminal of the first resistor is the cathode terminal of the third diode and the second resistor. A voltage detection unit that is connected to the first terminal of the diode and the first terminal of the diode, the second terminal of the second resistor is connected to the ground, and the second terminal of the capacitor is connected to the ground.
A control signal generation unit that compares the voltage waveform detected by the voltage detection unit with a reference reference voltage waveform and generates a control signal for controlling the switching element based on the comparison result.
A converter device equipped with. A zero-crossing detector that detects the zero-crossing point of the voltage output by the AC power supply,
A delay correction unit that corrects the delay of the voltage waveform generated by the voltage detection unit based on the zero cross point, and a delay correction unit.
The converter device according to any one of claims 1 to 3. Difference between switching element, 1st resistor, 2nd resistor, 3rd resistor, 4th resistor, 5th resistor, 6th resistor, 7th resistor, 8th resistor, 9th resistor A dynamic amplifier and a capacitor are provided, the first terminal of the first resistor is connected to one end of an AC power supply, and the second terminal of the first resistor is the first terminal of the third resistor and the fourth resistor. It is connected to the first terminal, the first terminal of the second resistor is connected to the other end of the AC power supply, and the second terminal of the second resistor is the second terminal of the third resistor and the fifth resistor. The second terminal of the fourth resistor is connected to the first terminal of the sixth resistor and the forward rotation input terminal of the differential amplifier, and is connected to the second terminal of the fifth resistor. Is connected to the first terminal of the seventh resistor and the inverting input terminal of the differential amplifier, and the second terminal of the sixth resistor is connected to a voltage source for setting a bias of the seventh resistor. The second terminal is connected to the first terminal of the eighth resistor, the first terminal of the ninth resistor, and the output terminal of the differential amplifier, and the second terminal of the eighth resistor is connected to the ground. A control method using a converter device including a voltage detection unit in which the second terminal of the ninth resistor is connected to the first terminal of the capacitor and the second terminal of the capacitor is connected to the ground.
Detecting a voltage waveform based on the voltage output by the AC power supply
Comparing the detected voltage waveform with the reference voltage waveform as a reference,
To generate a control signal for controlling the switching element based on the comparison result,
Control method by converter device including. A voltage detector that detects a voltage waveform based on the voltage output by a switching element and an AC power supply, and is a first diode, a second diode, a third diode, a first resistor, a second resistor, and a capacitor. The anode terminal of the first diode is connected to one end of the AC power supply, and the cathode terminal of the first diode is connected to the cathode terminal of the second diode and the first terminal of the first resistor. The anode terminal of the second diode is connected to the other end of the AC power supply, the anode terminal of the third diode is connected to the ground, and the second terminal of the first resistor is connected to the cathode terminal of the third diode. Voltage detection connected to the first terminal of the second resistor and the first terminal of the capacitor, the second terminal of the second resistor is connected to the ground, and the second terminal of the capacitor is connected to the ground. It is a control method by a converter device equipped with a diode.
Detecting a voltage waveform based on the voltage output by the AC power supply
Comparing the detected voltage waveform with the reference voltage waveform as a reference,
To generate a control signal for controlling the switching element based on the comparison result,
Control method by converter device including. Difference between switching element, 1st resistor, 2nd resistor, 3rd resistor, 4th resistor, 5th resistor, 6th resistor, 7th resistor, 8th resistor, 9th resistor A dynamic amplifier and a capacitor are provided, the first terminal of the first resistor is connected to one end of an AC power supply, and the second terminal of the first resistor is the first terminal of the third resistor and the fourth resistor. It is connected to the first terminal, the first terminal of the second resistor is connected to the other end of the AC power supply, and the second terminal of the second resistor is the second terminal of the third resistor and the fifth resistor. The second terminal of the fourth resistor is connected to the first terminal of the sixth resistor and the forward rotation input terminal of the differential amplifier, and is connected to the second terminal of the fifth resistor. Is connected to the first terminal of the seventh resistor and the inverting input terminal of the differential amplifier, and the second terminal of the sixth resistor is connected to a voltage source for setting a bias of the seventh resistor. The second terminal is connected to the first terminal of the eighth resistor, the first terminal of the ninth resistor, and the output terminal of the differential amplifier, and the second terminal of the eighth resistor is connected to the ground. To a computer of a converter device including a voltage detector in which the second terminal of the ninth resistor is connected to the first terminal of the capacitor and the second terminal of the capacitor is connected to the ground.
Detecting a voltage waveform based on the voltage output by the AC power supply
Comparing the detected voltage waveform with the reference voltage waveform as a reference,
To generate a control signal for controlling the switching element based on the comparison result,
A program that executes. A voltage detector that detects a voltage waveform based on the voltage output by a switching element and an AC power supply, and is a first diode, a second diode, a third diode, a first resistor, a second resistor, and a capacitor. The anode terminal of the first diode is connected to one end of the AC power supply, and the cathode terminal of the first diode is connected to the cathode terminal of the second diode and the first terminal of the first resistor. The anode terminal of the second diode is connected to the other end of the AC power supply, the anode terminal of the third diode is connected to the ground, and the second terminal of the first resistor is connected to the cathode terminal of the third diode. Voltage detection connected to the first terminal of the second resistor and the first terminal of the capacitor, the second terminal of the second resistor is connected to the ground, and the second terminal of the capacitor is connected to the ground. To the computer of the converter device equipped with a unit
Detecting a voltage waveform based on the voltage output by the AC power supply
Comparing the detected voltage waveform with the reference voltage waveform as a reference,
To generate a control signal for controlling the switching element based on the comparison result,
A program that executes.

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