WO2023243003A1 - Dispositif de conversion de puissance, dispositif d'entraînement de moteur et équipement utilisant un cycle de réfrigération - Google Patents

Dispositif de conversion de puissance, dispositif d'entraînement de moteur et équipement utilisant un cycle de réfrigération Download PDF

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WO2023243003A1
WO2023243003A1 PCT/JP2022/023983 JP2022023983W WO2023243003A1 WO 2023243003 A1 WO2023243003 A1 WO 2023243003A1 JP 2022023983 W JP2022023983 W JP 2022023983W WO 2023243003 A1 WO2023243003 A1 WO 2023243003A1
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Prior art keywords
signal
switching element
switching
power conversion
conversion device
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PCT/JP2022/023983
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English (en)
Japanese (ja)
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浩一 有澤
遥 松尾
貴昭 ▲高▼原
知宏 沓木
泰章 古庄
亮祐 小林
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三菱電機株式会社
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Priority to PCT/JP2022/023983 priority Critical patent/WO2023243003A1/fr
Publication of WO2023243003A1 publication Critical patent/WO2023243003A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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

Definitions

  • the present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle application device that performs power conversion.
  • the opening and closing speed of the switching element has been changed by switching and connecting gate resistors with different gate resistance values to the switching element.
  • Patent Document 1 in an inverter control device including an inverter main circuit having a plurality of switching elements, when changing the gate drive waveform of the switching element, the gate resistance connected to the switching element is changed using a switch.
  • a technique for switching to a gate resistance with a gate resistance value has been disclosed.
  • the switching speed of the switching element can be changed, so it is possible to operate the device in consideration of both noise and loss that occur depending on the operating state of the device.
  • the technology described in Patent Document 1 is a technology that switches the switching speed depending on the gate resistance value of the gate resistor, many resistance values are required to control noise and loss to the desired state, and the circuit size is There is a problem that the amount increases. Therefore, there is a need for a technology that can control noise and loss to a desired state while suppressing an increase in circuit scale.
  • the present disclosure has been made in view of the above, and aims to provide a power conversion device that can control noise and loss to a desired state while suppressing an increase in circuit scale.
  • a power conversion device includes an inverter having a plurality of switching elements, a control section, a drive section, and a state quantity detection section, supplies power to the motor that drives the
  • the control unit controls the operation of the inverter.
  • the drive section drives the plurality of switching elements.
  • the state quantity detection unit detects a state quantity indicating an operating state of the power conversion device.
  • the drive section includes a switching element drive section that drives the switching element by changing the opening/closing characteristics of the switching element.
  • the control section includes a first signal generation section, a second signal generation section, and a signal transmission section.
  • the first signal generation section generates a first setting signal that determines an open/closed state of at least one switching element among the plurality of switching elements.
  • the second signal generation section generates a second setting signal that defines switching characteristics of at least one switching element according to the state quantity.
  • the signal transmitting section generates a control signal for operating the switching element driving section based on the first and second setting signals, and transmits the control signal to the switching element driving section.
  • the power conversion device According to the power conversion device according to the present disclosure, it is possible to control noise and loss to a desired state while suppressing an increase in circuit scale.
  • Diagram showing an example of the relationship between noise and loss generated in general switching elements The first diagram used to explain the effect obtained by changing the opening/closing speed of the switching element of the inverter in the power conversion device according to the first embodiment.
  • a second diagram used to explain the effect obtained by changing the opening/closing speed of the switching element of the inverter in the power converter according to the first embodiment A diagram illustrating a configuration example of a switching element drive section of a power conversion device according to Embodiment 1.
  • the first diagram showing the relationship between the gate current output by the switching element drive section and the gate voltage indicating the rising speed of the switching element in the power conversion device according to the first embodiment.
  • a second diagram showing the relationship between the gate current output by the switching element drive unit and the gate voltage indicating the rising speed of the switching element in the power conversion device according to the first embodiment.
  • Flowchart used to explain the operation of changing the switching characteristics of a switching element in the power conversion device according to Embodiment 1 A diagram illustrating an example of a hardware configuration that implements a control unit included in the power conversion device according to Embodiment 1.
  • a diagram showing a configuration example of a power conversion device according to Embodiment 2 A diagram showing a basic signal, a switching characteristic setting signal, and a switching characteristic switching signal used in Embodiment 2 in relation to a carrier signal.
  • a diagram showing a configuration example of a power conversion device according to Embodiment 3 A diagram showing a configuration example of a power conversion device according to Embodiment 4
  • FIG. 1 is a diagram showing a configuration example of a power conversion device 1 according to the first embodiment.
  • Power conversion device 1 is connected to commercial power source 110 and motor 314.
  • the power conversion device 1 converts first AC power based on a power supply voltage supplied from a commercial power source 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to the motor 314.
  • the commercial power source 110 is a three-phase AC power source in the example of FIG. 1, it may be a single-phase AC power source.
  • the power conversion device 1 includes a rectifier 130, state quantity detection units 501, 502, 505, and 506, a capacitor 210, an inverter 310, a drive unit 320, and a control unit 400. Note that the power conversion device 1 and the motor 314 constitute a motor drive device 2.
  • the rectifying section 130 includes, for example, a bridge circuit composed of four rectifying elements (not shown) and a reactor.
  • the rectifier 130 rectifies the AC voltage of the first AC power supplied from the commercial power source 110 and converts it into DC power.
  • the rectifier 130 may include a boost chopper circuit or the like.
  • the capacitor 210 is connected to the output end of the rectifier 130 and smoothes the DC power converted by the rectifier 130.
  • the capacitor 210 is, for example, an electrolytic capacitor, a film capacitor, or the like. Note that the power converter 1 only needs to be able to supply DC power to the inverter 310, so the commercial power supply 110, rectifier 130, and capacitor 210 may be replaced with a DC power supply, a battery, or the like.
  • the state quantity detection unit 501 detects a state quantity indicating the operating state of the power conversion device 1.
  • the state quantity detection unit 501 detects, for example, the voltage value of the DC power supplied from the capacitor 210 to the inverter 310, the current value of the DC power supplied from the capacitor 210 to the inverter 310, and the like.
  • the inverter 310 is a power converter connected to both ends of the capacitor 210.
  • the inverter 310 includes switching elements 311a to 311f, which are semiconductor elements, and freewheeling diodes 312a to 312f. These switching elements 311a to 311f and free wheel diodes 312a to 312f are housed in a semiconductor package 342.
  • the switching elements 311a to 311f are controlled to be turned on or off by the drive section 320 under the control of the control section 400.
  • the inverter 310 converts the DC power output from the rectifier 130 and the capacitor 210 into second AC power having a desired amplitude and phase by turning on and off the switching elements 311a to 311f. generated and output to the motor 314.
  • the switching elements 311a to 311f are, for example, IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), etc. transistors), bipolar transistors, etc., but are not limited to these.
  • the circuit configuration of the inverter 310 is not particularly limited, and may be a three-phase bridge circuit, a single-phase bridge circuit, a half-bridge circuit, or the like. Further, inverter 310 is not limited to a two-level three-phase bridge circuit, but may be a three-level three-phase bridge circuit.
  • the drive section 320 includes a switching element drive section 340 that can change the opening/closing characteristics of the switching elements 311a to 311f.
  • the switching waveforms of the switching elements 311a to 311f are one of the switching characteristics of the switching elements 311a to 311f.
  • the switching element driving section 340 can output two or more waveform shapes as the switching waveforms of the switching elements 311a to 311f.
  • the switching element driving section 340 is configured to be able to change the switching characteristics of the switching elements 311a to 311f, but it is possible to change the switching characteristics of at least one of the switching elements 311a to 311f. do.
  • the drive section 320 including the switching element drive section 340 may be a component located inside the inverter 310.
  • the inverter 310 may be configured to include a switching element drive section 340 for each of the switching elements 311a to 311f. The detailed operation of the switching element drive unit 340 will be described later.
  • the state quantity detection unit 502 detects a state quantity indicating the operating state of the power conversion device 1.
  • the state quantity detection unit 502 detects, for example, the voltage value of the second AC power supplied from the inverter 310 to the motor 314, which is the load, and the current value of the second AC power, which is supplied from the inverter 310 to the motor 314, which is the load. Detect etc.
  • the state quantity detection unit 505 detects a state quantity indicating the operating state of the power conversion device 1.
  • the state quantity detection unit 505 detects, for example, the current value of the DC power supplied from the capacitor 210 to the inverter 310.
  • the state quantity detection unit 506 detects a state quantity indicating the operating state of the power conversion device 1.
  • the state quantity detection unit 506 detects, for example, current flowing through the switching elements 311b, 311d, and 311f.
  • the control unit 400 acquires the state quantities detected by the state quantity detection units 501, 502, 505, and 506, and controls the inverter 310 based on the obtained state quantities. The operation is controlled, specifically, the on/off of the switching elements 311a to 311f of the inverter 310 is controlled.
  • the control section 400 includes a basic signal generation section 410, a signal transmission section 420, and an opening/closing characteristic setting section 430.
  • the basic signal generation unit 410 calculates a duty ratio according to the state quantities detected by the state quantity detection units 501, 502, 505, and 506. Further, the basic signal generating section 410 generates a basic signal S1 for controlling the operation of the switching elements 311a to 311f of the inverter 310 based on the duty ratio and the carrier signal CA.
  • the basic signal S1 is, for example, a pulse width modulation (PWM) signal having a duty ratio according to the state quantities detected by the state quantity detection units 501, 502, 505, and 506.
  • PWM pulse width modulation
  • An example of a carrier signal is a triangular wave signal.
  • the triangular wave signal is a periodic signal that is repeated with a carrier period that is one period of the carrier signal.
  • the basic signal S1 generated by the basic signal generation unit 410 is a signal that determines the open/closed state of at least one of the switching elements 311a to 311f, that is, whether the switching element is on or off.
  • the basic signal generation unit 410 may be referred to as a “first signal generation unit” and the basic signal S1 may be referred to as a “first setting signal”.
  • the basic signal generation section 410 outputs the generated basic signal S1 to the signal transmission section 420 and the switching characteristic setting section 430.
  • the switching characteristic setting section 430 generates a switching characteristic setting signal S2 for setting the switching characteristics of the switching elements 311a to 311f when changing the switching characteristics of the switching elements 311a to 311f by the switching element driving section 340 of the driving section 320. do.
  • the opening/closing characteristic setting signal S2 is set according to the state quantities detected by the state quantity detection units 501, 502, 505, and 506.
  • the switching characteristic setting signal S2 generated by the switching characteristic setting section 430 is a signal that determines the switching characteristic of at least one switching element among the switching elements 311a to 311f.
  • the carrier signal CA is referred to in generating the switching characteristic setting signal S2.
  • the switching characteristic setting section 430 turns on and off the switching elements 311a to 311f based on the basic signal S1 generated by the basic signal generation section 410 for controlling the operation of the switching elements 311a to 311f of the inverter 310.
  • the switching element driving section 340 of the driving section 320 generates a signal that controls the magnitude of the driving signal for actually driving the switching elements 311a to 311f and the timing of outputting the driving signal as the switching characteristic setting signal S2.
  • the switching characteristic setting section 430 may be referred to as a "second signal generation section” and the switching characteristic setting signal S2 may be referred to as a "second setting signal.”
  • the switching characteristic setting section 430 outputs the generated switching characteristic setting signal S2 to the signal transmitting section 420.
  • the signal transmitting section 420 generates a control signal CS for operating the switching element driving section 340 based on the basic signal S1 and the switching characteristic setting signal S2, and transmits it to the switching element driving section 340.
  • the control unit 400 includes a signal transmission unit for each switching element drive unit 340. 420, that is, a configuration including six signal transmitters 420.
  • the control unit 400 acquires the state quantities detected by the state quantity detection units 501, 502, 505, and 506 from the state quantity detection units 501, 502, 505, and 506, and determines the acquired state.
  • the operation of the inverter 310 is controlled based on the amount, the present invention is not limited thereto.
  • the control unit 400 can control the operation of the inverter 310 based on the state quantity acquired from at least one of the state quantity detection units 501, 502, 505, and 506.
  • the power conversion device 1 does not need to arrange all the state quantity detection units 501, 502, 505, and 506 as shown in FIG.
  • the power conversion device 1 may include the state quantity detection section anywhere as long as the state quantity can be detected at a position other than that shown in the figure.
  • the motor 314 is a load connected to the power converter 1.
  • the motor 314 is, for example, a motor for driving a compressor.
  • the motor 314 rotates according to the amplitude and phase of the second AC power supplied from the inverter 310, and performs a compression operation.
  • the load torque of the motor 314 that drives the compressor can often be regarded as a constant torque load.
  • the motor 314 may have a Y-connection, a ⁇ -connection, or a specification in which the Y-connection and the ⁇ -connection can be switched for motor windings (not shown).
  • the load connected to the power conversion device 1 is not limited to the motor 314 for driving the compressor, but may be a fan motor or a motor included in a hand dryer. Further, the load connected to the power converter 1 is not limited to the motor 314, and may be a load other than the motor 314.
  • the power conversion device 1 can change the switching characteristics of the switching elements 311a to 311f of the inverter 310 using the switching characteristics setting section 430 and the switching element driving section 340. Specifically, the power conversion device 1 can change the opening/closing speed, dead time, etc. when the switching elements 311a to 311f of the inverter 310 open/close.
  • the dead time is a short circuit prevention period provided to prevent an arm short circuit in which the upper arm switching elements 311a, 311c, 311e and the corresponding lower arm switching elements 311b, 311d, 311f are turned on at the same time.
  • FIG. 2 is a diagram showing examples of turn-on Joule loss, turn-on current, and turn-on voltage when the switching speeds of switching elements 311a to 311f of inverter 310 are slowed down in power converter 1 according to Embodiment 1.
  • FIG. 3 is a diagram showing examples of turn-on Joule loss, turn-on current, and turn-on voltage when the switching speeds of switching elements 311a to 311f of inverter 310 are increased in power converter 1 according to the first embodiment.
  • A indicates turn-on Joule loss
  • B indicates turn-on current
  • C indicates turn-on voltage.
  • the horizontal axis indicates time.
  • the turn-on current is the current flowing through the switching element 311a
  • the turn-on voltage is the voltage applied across the switching element 311a
  • the turn-on Joule loss is the product of the turn-on current and the turn-on voltage
  • the measurement target is the switching element 311a. It is not limited to the element 311a, and other switching elements 311b to 311f may be used. Note that FIGS.
  • FIGS. 2 and 3 show the differences in each characteristic depending on the opening/closing speed of the switching elements 311a to 311f of the inverter 310, and the specific values of "slow” and “fast” in the opening/closing speed are not particularly important. .
  • FIGS. 2 and 3 by slowing down the switching speed, the noise represented by the peak value of the turn-on current of B becomes smaller, but the loss represented by the area of the turn-on joule loss of A becomes larger.
  • FIGS. 2 and 3 by increasing the switching speed, the noise indicated by the peak value of the turn-on current of B increases, but the loss indicated by the area of the turn-on joule loss of A decreases. . That is, in the switching elements 311a to 311f, there is a trade-off relationship between noise and loss generated.
  • the switching element drive section 340 is configured by a digital gate driver.
  • the switching elements 311a to 311f of the inverter 310 and the switching element driving section 340 are configured by a digital gate driver module.
  • the power conversion device 1 can change the opening/closing speed of the switching elements 311a to 311f of the inverter 310 by changing the command value of the software without changing the hardware, and the switching elements 311a to 311f It is possible to control noise and loss generated in a desired state.
  • the function of the switching characteristic setting section 430 in the control section 400 can also be configured within a digital gate driver module. In the case of this configuration, the functions of the existing control unit 400 can be used without modification.
  • FIG. 4 is a diagram showing an example of the relationship between noise and loss generated in a general switching element. As mentioned above, there is a trade-off relationship between noise and loss generated in switching elements. Therefore, in general switching elements, as shown in Figure 4, increasing the opening/closing speed increases noise but reduces loss, and slowing the opening/closing speed decreases noise but increases loss. .
  • FIG. 5 is a first diagram used to explain the effect obtained by changing the opening/closing speed of switching elements 311a to 311f of inverter 310 in power conversion device 1 according to Embodiment 1. Even if the power converter 1 is operated within the noise range specified by the product in which the power converter 1 is installed, when the load state of the motor 314 changes from light load to heavy load, the power converter 1 will cause the noise shown in FIG. 5 to change from light load to heavy load. As such, the curve showing the characteristics of noise and loss generated in the switching elements 311a to 311f moves toward the upper right, resulting in an increase in noise. That is, in the power conversion device 1, the heavier the load, the more noise increases.
  • the power conversion device 1 can reduce the noise generated in the switching elements 311a to 311f by slowing down the opening/closing speed of the switching elements 311a to 311f.
  • the power conversion device 1 can reduce the loss generated in the switching elements 311a to 311f by increasing the opening/closing speed of the switching elements 311a to 311f.
  • the switching characteristic setting unit 430 controls the loss generated in the switching elements 311a to 311f while the noise generated in the switching elements 311a to 311f satisfies the specified requirements.
  • the settings of the opening/closing characteristics of the switching elements 311a to 311f are changed so as to reduce the.
  • the switching characteristic setting unit 430 determines whether or not the loss generated in the switching elements 311a to 311f satisfies the specified requirements.
  • the settings of the switching characteristics of the switching elements 311a to 311f are changed so as to reduce the noise caused by the switching elements 311a to 311f.
  • FIG. 6 is a second diagram used to explain the effect obtained by changing the opening/closing speed of switching elements 311a to 311f of inverter 310 in power conversion device 1 according to Embodiment 1.
  • the power conversion device 1, specifically, the switching element drive unit 340 for example, divides a turn-on period or a turn-off period into two or more periods in one switching operation of the switching elements 311a to 311f, and in each divided period, The amplitudes of the gate currents or gate voltages for the switching elements 311a to 311f are changed to different magnitudes.
  • the power converter 1 can reduce the power generated in the switching elements 311a to 311f, which could not be achieved with general switching elements as shown in FIG. It is possible to obtain noise and loss characteristics that
  • FIG. 7 is a diagram illustrating a configuration example of the switching element drive section 340 of the power conversion device 1 according to the first embodiment.
  • FIG. 7 is also a diagram showing a configuration example of one digital gate driver configured by the switching element drive section 340 and the switching element 311a.
  • the switching element drive unit 340 includes n PMOSs (P-channel Metal Oxide Semiconductors) that are P-channel MOSFETs for turn-on, n PreDrivers for operating the n PMOSs, and n PreDrivers for turn-off. It includes an NMOS (N-channel Metal Oxide Semiconductor) that is an N-channel MOSFET, and n PreDrivers for operating the n NMOS.
  • PMOSs P-channel Metal Oxide Semiconductors
  • NMOS N-channel Metal Oxide Semiconductor
  • the switching element driving section 340 is connected to the control power supply Vdd and the ground GND.
  • the switching element driving section 340 receives the control signal CS transmitted from the signal transmitting section 420.
  • the switching element driver 340 changes the number of PMOSs or NMOSs to be operated in the switching element driver 340 based on the control signal CS.
  • the switching element driving section 340 changes the amplitude value of the gate current IG , which is a drive signal output to the switching element 311a, in n ways in each period of the turn-on period and the turn-off period, and changes the opening/closing speed of the switching element 311a. can be adjusted.
  • the switching element driving section 340 can increase the absolute value of the gate current IG output to the switching element 311a as the number of PMOSs or NMOSs to operate increases, and the switching element driving section 340 can increase the opening/closing speed of the switching element 311a. can. In addition, the switching element drive section 340 can more finely adjust the opening/closing speed of the switching element 311a as the number of PMOSs and NMOSs provided therein increases; It is possible to finely adjust the gate current IG during the switching period.
  • the control signal CS from the signal transmitting section 420 may be an analog signal or a digital signal as long as it can change the number of PMOSs or NMOSs operated in the switching element driving section 340. Furthermore, although the example in FIG.
  • control signals CS there are m parallel control signals CS from the signal transmitter 420 to the switching element drive unit 340, this is just an example, and the number of control signals CS is limited to m. Not done.
  • the number of control signals CS may be a number that can indicate whether each PMOS and each NMOS can operate, or it may be one as long as it is an analog signal that indicates voltage or the like. .
  • FIG. 8 is a diagram showing the signal sequence of the basic signal S1 and the switching characteristic setting signal S2 used in the first embodiment in relation to the carrier signal. Specifically, the upper part of FIG. 8 shows a triangular wave signal which is an example of a carrier signal. In the middle part of FIG. 8, a PWM signal that is an example of the basic signal S1 that determines the open/close state of the switching element 311a is shown.
  • the lower part of FIG. 8 shows a switching characteristic setting signal S2 that determines the switching characteristics of the switching element 311a. Note that although the switching characteristic setting signal S2 is shown in a simplified manner in the lower part of FIG. 8, it is assumed that a plural-bit serial signal is transmitted within a period indicated by one pulse.
  • the basic signal S1 is generated based on the timing of the valley, which is the bottom of the triangular wave signal.
  • the data length of the basic signal S1 is fixed and is generated on the order of microseconds.
  • One period of the basic signal S1 is, for example, 10 ⁇ s to 1 ms.
  • the basic signal S1 having a data length of 10 ⁇ s to 1 ms is sent to the signal transmitter 420 every cycle of 10 ⁇ s to 1 ms.
  • the opening/closing characteristic setting signal S2 is generated based on the timing of the peak, which is the top of the triangular wave signal.
  • the data length of the switching characteristic setting signal S2 is variable.
  • the switching characteristic setting signal S2 is a signal that is generated every time the switching characteristic needs to be changed, that is, irregularly.
  • the switching characteristic setting signal S2 is assumed to be a multi-bit serial signal. To give a specific example, if a pulse signal of 100 ⁇ s width is sent for 48 bits in one period, the data length of the switching characteristic setting signal S2 is 4.8 ms. If at least 10 bits of information are to be sent, the data length will be 1 ms or more. Therefore, the switching characteristic setting signal S2 is generated on the order of milliseconds and sent to the signal transmitter 420.
  • the signal transmitting section 420 when the signal transmitting section 420 does not receive the switching characteristic setting signal S2, the signal transmitting section 420 generates the control signal CS using only the basic signal S1, and transmits the generated control signal CS to the switching element driving section. 340. Further, in the first embodiment, when receiving the switching characteristic setting signal S2, the signal transmitting section 420 transmits both the basic signal S1 and the switching characteristic setting signal S2 after the reception of the switching characteristic setting signal S2 is completed. is used to generate a control signal CS and transmit it to the switching element driving section 340. In this way, the switching elements 311a to 311f of the inverter 310 can be stably driven.
  • the basic signal S1 is generated based on the timing of the trough of the triangular wave signal, and the opening/closing characteristic setting signal S2 is generated based on the timing of the peak of the triangular wave signal, the present invention is not limited to this.
  • the basic signal S1 may be generated based on the peak timing of the triangular wave signal, and the switching characteristic setting signal S2 may be generated based on the timing of the trough of the triangular wave signal.
  • FIG. 9 is a first diagram showing the relationship between the gate current IG output by the switching element drive section 340 and the gate voltage VG indicating the rising speed of the switching element 311a in the power conversion device 1 according to the first embodiment. be.
  • FIG. 10 is a second diagram showing the relationship between the gate current IG output by the switching element drive unit 340 and the gate voltage VG indicating the rising speed of the switching element 311a in the power conversion device 1 according to the first embodiment. be.
  • the switching element driving section 340 can increase the rise of the gate voltage VG , that is, increase the opening/closing speed of the switching element 311a, as the output gate current IG increases. can.
  • FIGS. 9 the switching element driving section 340 can increase the rise of the gate voltage VG , that is, increase the opening/closing speed of the switching element 311a, as the output gate current IG increases. can.
  • FIGS. 9 shows the switching element driving section 340 can increase the rise of the gate voltage VG , that is, increase
  • the switching element driving section 340 slows down the rise of the gate voltage VG , that is, the opening/closing speed of the switching element 311a, as the output gate current IG becomes smaller. be able to.
  • the output gate current IG is decreased to slow down the opening/closing speed, and the noise generated in the switching element 311a is reduced.
  • the output gate current IG can be increased to increase the opening/closing speed. Note that the waveforms of the gate current IG and gate voltage VG shown in FIGS. 9 and 10 are ideal examples, and in reality, as shown in FIGS. 2 and 3, the gate current IG is constant. It will take time to reach the current value.
  • FIG. 11 is a third diagram showing the relationship between the gate current IG output by the switching element drive unit 340 and the gate voltage VG indicating the rising speed of the switching element 311a in the power conversion device 1 according to the first embodiment. be.
  • the switching element driver 340 can divide the turn-on period and change the magnitude of the gate current IG in each period. That is, the switching element driver 340 can finely adjust the magnitude of the gate current IG during one turn-on period.
  • the power converter 1 can reduce the noise generated in the switching element 311a while reducing the noise generated in the switching element 311a, as shown in FIG. 6, compared to the case where the same gate current IG is output during the turn-on period. control can be performed to reduce the loss caused by
  • FIG. 12 is a diagram illustrating an example of the relationship between the basic signal S1 outputted by the basic signal generation section 410 and the gate current IG outputted by the switching element drive section 340 in the power conversion device 1 according to the first embodiment. In FIG. 12, it is assumed that
  • the switching element driving unit 340 divides the period in which the gate current IG is output during the turn-on period of the switching element 311a, and first outputs the gate current IG with a large amplitude current Ig2, and then outputs the gate current IG with a small amplitude current Ig1.
  • the gate current IG of the current Ig1 with a small amplitude may be outputted first, and then the gate current IG of the current Ig2 with a large amplitude may be outputted.
  • the switching element driver 340 divides the period in which the gate current IG is output during the turn-off period of the switching element 311a, first outputs the gate current IG with a large amplitude - Ig2, and then outputs the gate current IG with a large amplitude. You may output the gate current IG with a small current -Ig1, or first output the gate current IG with a small amplitude current -Ig1, and then output the gate current IG with a large amplitude current -Ig2. You can also output it.
  • the switching element driving unit 340 determines the opening/closing characteristic of the switching element 311a based on the opening/closing characteristic set by the opening/closing characteristic setting unit 430 for at least one period of the turn-on period and the turn-off period of the switching element 311a. It is possible to divide the period into two or more, and change the amplitude of the gate current IG to the switching element 311a to a different magnitude in each divided period. Furthermore, the switching element driving section 340 includes a plurality of transistors, and can change the amplitude of the gate current IG by changing the number of transistors to be operated based on the switching characteristics set by the switching characteristics setting section 430. Can be done.
  • the switching element driving section 340 can change the output pattern of the gate current IG every switching period of the switching element 311a.
  • the switching element drive section 340 can change the opening/closing characteristics to be different for each switching period of the switching element 311a while the power conversion device 1 is in operation.
  • the switching characteristic setting section 430 can change the setting of the switching characteristic of the switching element 311a at the same cycle as the switching cycle of the switching element 311a.
  • the switching characteristic setting section 430 may change the setting of the switching characteristic of the switching element 311a at a cycle that is a positive integer multiple of the switching cycle of the switching element 311a.
  • the configuration of the switching element drive section 340 shown in FIG. 7 is an example, and is not limited thereto.
  • the switching element driving section 340 may use transistors other than MOS (Metal Oxide Semiconductor) for internal use.
  • the switching element drive unit 340 uses digital control using a plurality of MOSs to control the opening and closing speed of the switching element 311a more precisely than analog control that physically switches the gate resistance as described in Patent Document 1. can be adjusted to Furthermore, since the resistance value of the gate resistor varies depending on the temperature, accuracy with respect to temperature variation may become a problem. In contrast, with digital gate drivers, this problem does not occur. Therefore, the switching element drive section 340 configured by the digital gate driver can adjust the opening/closing speed with high precision.
  • the switching element driving section 340 changes the number of PMOSs or NMOSs to be operated according to the acquired control signal CS, and applies a gate current IG to the switching element 311a according to the number of PMOSs or NMOSs to be operated.
  • the switching element driving section 340 may store in advance an output pattern of the gate current IG according to the control signal CS, and output the gate current IG with the output pattern according to the acquired control signal CS.
  • the switching element drive unit 340 stores the control signal CS acquired in the past and the output pattern of the gate current IG when the control signal CS was acquired in the past, and stores it when the same control signal CS is acquired.
  • the gate current IG may be output in the same output pattern as before.
  • the switching element drive section 340 adjusts the opening/closing speed of the switching element 311a by changing the gate current IG as a drive signal output to the switching element 311a, and changes the opening/closing characteristics of the switching element 311a.
  • the switching element drive section 340 sets the drive signal output to the switching element 311a as a gate voltage VG , and by changing the gate voltage VG , similarly adjusts the opening/closing speed of the switching element 311a and changes the opening/closing characteristics of the switching element 311a. can be changed.
  • the switching element driving section 340 determines the opening/closing characteristic of the switching element 311a based on the opening/closing characteristic set by the opening/closing characteristic setting section 430, for at least one period of the turn-on period and the turn-off period of the switching element 311a. can be divided into two or more periods, and the amplitude of the gate voltage VG applied to the switching element 311a can be changed to a different magnitude in each divided period. Further, the switching element driving section 340 includes a plurality of transistors, and can change the amplitude of the gate voltage VG by changing the number of transistors to be operated based on the switching characteristics set by the switching characteristics setting section 430. Can be done.
  • the switching element driving section 340 may adjust the dead time set in the opening/closing operation of the switching elements 311a to 311f when controlling the opening/closing speed described above. Specifically, when changing the opening/closing speed, if the opening/closing speed after the change is set faster than the opening/closing speed before the change, the switching element driving section 340 converts the dead time after the change into the dead time before the change. Set it shorter than . Moreover, when the opening/closing speed after the change is set to be slower than the opening/closing speed before the change, the switching element driving section 340 sets the dead time after the change to be longer than the dead time before the change. In this way, the dead time can be adjusted appropriately, so that the influence of voltage errors caused by the dead time can be reduced.
  • FIG. 13 is a flowchart used to explain the operation of changing the switching characteristics of the switching elements 311a to 311f in the power conversion device 1 according to the first embodiment.
  • the basic signal generation unit 410 generates a basic signal S1 for driving the switching elements 311a to 311f of the inverter 310 based on the state quantities acquired from the state quantity detection units 501, 502, 505, and 506. Generate (step S1).
  • the basic signal generation unit 410 generates the basic signal S1 based on the state quantities acquired from the state quantity detection units 501, 502, 505, and 506, and turns on the switching elements 311a to 311f. Decide when to turn off and when to turn off.
  • the basic signal generation section 410 outputs the generated basic signal S1 to the switching characteristic setting section 430.
  • the switching characteristic setting section 430 opens and closes the switching elements 311a to 311f of the inverter 310 based on the basic signal S1 obtained from the basic signal generation section 410 and the state quantities obtained from the state quantity detection sections 501, 502, 505, and 506.
  • a switching characteristic setting signal S2 for setting characteristics is generated (step S2).
  • the switching characteristics setting signal S2 is set with the switching characteristics at the timing to turn on and the timing to turn off the switching elements 311a to 311f determined by the basic signal S1.
  • the signal transmitting unit 420 generates a control signal CS that operates the switching element driving unit 340 based on the basic signal S1 and the switching characteristic setting signal S2 (step S3).
  • the control signal CS generated by the signal transmitter 420 is transmitted to the switching element driver 340.
  • the switching element driving section 340 changes the opening/closing characteristics of the switching elements 311a to 311f based on the control signal CS acquired from the signal transmitting section 420 (step S4).
  • the power conversion device 1 drives the switching elements 311a to 311f of the inverter 310 by the functions of the basic signal generation section 410, signal transmission section 420, and switching characteristic setting section 430 described above. At this time, the switching characteristics of the switching elements 311a to 311f can be changed.
  • FIG. 14 is a diagram illustrating an example of a hardware configuration that implements the control unit 400 included in the power conversion device 1 according to the first embodiment.
  • the control unit 400 is realized by a processor 91 and a memory 92.
  • the processor 91 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or system LSI (Large Scale Integrator). ation).
  • the memory 92 includes RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPRO. Nonvolatile or volatile such as M (registered trademark) (Electrically Erasable Programmable Read Only Memory) An example is semiconductor memory. Furthermore, the memory 92 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).
  • the control section controls the operation of the inverter, and the drive section drives the plurality of switching elements included in the inverter.
  • the drive section includes a switching element drive section that drives the switching element by changing the opening/closing characteristics of the switching element.
  • the control section includes first and second signal generation sections and a signal transmission section.
  • the first signal generation section generates a first setting signal that determines an open/closed state of at least one switching element among the plurality of switching elements.
  • the second signal generation section generates a second setting signal that defines switching characteristics of at least one switching element according to the state quantity.
  • the signal transmitting section generates a control signal for operating the switching element driving section based on the first and second setting signals, and transmits the control signal to the switching element driving section.
  • the power conversion device can change the switching characteristics of the switching element while suppressing an increase in circuit scale.
  • the switching element drive section sets at least one period of the turn-on period and the turn-off period of the switching element to 2 based on the switching characteristic set by the switching characteristic setting signal.
  • the period is divided into the above periods, and the amplitude of the gate current or gate voltage for the switching element can be changed to a different magnitude in each divided period.
  • the gate current or gate voltage output to the switching element during one switching period can be finely adjusted, and switching characteristics that could not be achieved with methods such as Patent Document 1 can be achieved. can be realized. Thereby, noise and loss can be controlled to a desired state while suppressing an increase in circuit scale.
  • the signal transmitting unit when the signal transmission unit has not received the second setting signal, the signal transmitting unit generates the control signal using only the first setting signal, and generates the control signal using the second setting signal. If the control signal is received, the control signal is generated using both the first and second setting signals after the reception of the second setting signal is completed. As a result, the second setting signal that has been completely received is immediately reflected in the control of the opening/closing characteristics. Thereby, load fluctuations occurring in the power converter can be quickly suppressed.
  • FIG. 15 is a diagram showing a configuration example of a power conversion device 1A according to the second embodiment.
  • the power conversion device 1A and the motor 314 constitute a motor drive device 2A.
  • the power conversion device 1A according to the second embodiment in the configuration of FIG. It has been replaced by a transmitter 420A.
  • a signal receiving section 350 is added to the driving section 320A in FIG. 15 .
  • the other configurations are the same or equivalent to the power conversion device 1 shown in FIG. 1, and the same or equivalent components are denoted by the same reference numerals, and redundant explanations will be omitted.
  • the signal transmitting section 420A transmits the basic signal S1 sent out from the basic signal generating section 410 to the signal receiving section 350 of the driving section 320A.
  • the basic signal S1 may be transmitted in parallel or serially.
  • the signal transmitting section 420A transmits the switching characteristic setting signal S2 sent from the switching characteristic setting section 430 to the signal receiving section 350 of the driving section 320A.
  • the switching characteristic setting signal S2 is transmitted by serial transmission.
  • Any synchronization method may be used for synchronization in serial transmission. Typical synchronization methods include start-stop synchronization, independent synchronization, and frame synchronization.
  • FIG. 16 is a diagram showing the basic signal S1, the switching characteristic setting signal S2, and the switching characteristic switching signal used in the second embodiment in relation to the carrier signal.
  • a triangular wave signal which is an example of a carrier signal
  • a PWM signal that is an example of the basic signal S1 that determines the open/close state of the switching element 311a is shown.
  • a switching characteristic setting signal S2 that determines the switching characteristics of the switching element 311a is shown in the lower middle part of FIG. 16.
  • These triangular wave signals, basic signal S1, and switching characteristic setting signal S2 are basically the same as those described in the first embodiment.
  • the opening/closing characteristic switching signal is shown in the lower part of FIG. This opening/closing characteristic switching signal is superimposed on the opening/closing characteristic setting signal S2 and transmitted to the signal receiving section 350 of the driving section 320A.
  • the opening/closing characteristic switching signal is a timing signal that specifies the switching timing for switching the opening/closing characteristics of the switching elements 311a to 311f. That is, in the second embodiment, the switching characteristic setting signal S2 includes a timing signal that specifies the timing for switching the switching characteristics of the switching elements 311a to 311f.
  • control of the second embodiment it is possible to change the opening/closing characteristics of the plurality of switching elements all at once at a timing when none of the plurality of switching elements performs opening/closing operations.
  • Such control is useful in applications with a large number of switching elements, such as inverter drive of a three-phase motor.
  • the load can be stably driven.
  • the control section controls the operation of the inverter, and the drive section drives the plurality of switching elements included in the inverter.
  • the control section includes first and second signal generation sections and a signal transmission section.
  • the drive section includes a switching element drive section and a signal reception section.
  • the first signal generation section generates a first setting signal that determines an open/closed state of at least one switching element among the plurality of switching elements.
  • the second signal generation section generates a second setting signal that defines switching characteristics of at least one switching element according to the state quantity.
  • the signal transmitting section transmits the first and second setting signals to the driving section.
  • the signal receiving section generates a control signal CS that operates the switching element driving section based on the first and second setting signals received from the control section.
  • the switching element driver changes the opening/closing characteristics of the switching element based on the control signal CS.
  • the power converter device can change the opening/closing characteristics of the switching element including the opening/closing speed while suppressing an increase in circuit scale.
  • the power conversion device can change the switching characteristics of a plurality of switching elements all at once, the load can be stably driven even if the switching characteristics are changed.
  • FIG. 17 is a diagram illustrating a configuration example of a power conversion device 1B according to the third embodiment.
  • the power converter 1B and the motor 314 constitute a motor drive device 2B.
  • the drive unit 320A in the configuration of FIG. 15 is replaced with a drive unit 320B.
  • a noise suppressing section 360 is added to the input side of the signal receiving section 350.
  • the other configurations are the same or equivalent to the power conversion device 1A shown in FIG. 15, and the same or equivalent components are denoted by the same reference numerals, and redundant explanation will be omitted.
  • the noise suppressor 360 suppresses high frequency noise included in the switching characteristic setting signal S2.
  • An example of the noise suppressor 360 is a low-pass filter.
  • the low-pass filter can be configured with an RC filter including a resistor and a capacitor. Further, the low-pass filter may be configured only with a capacitor.
  • the noise suppressing section 360 suppresses high frequency noise that may be included in the switching characteristic setting signal S2. This can prevent the switching characteristics of the switching elements 311a to 311f from being changed erroneously. This effect is particularly useful when the switching elements 311a to 311f are power semiconductor elements to which a high voltage is applied.
  • the switching characteristic setting signal S2 is passed through the noise suppressing section 360, but the present invention is not limited thereto.
  • the basic signal S1 may also be received by the signal receiving unit 350 after passing through the noise suppressing unit.
  • the drive section includes a noise suppressing section that suppresses high frequency noise
  • the signal receiving section includes a signal transmitting section.
  • the noise suppressor receives at least one of the first and second setting signals transmitted from the noise suppressor. This makes it possible to suppress high-frequency noise that may be superimposed on the basic signal S1 or the switching characteristic setting signal S2, thereby preventing the switching characteristics of the switching element from being erroneously changed.
  • FIG. 18 is a diagram showing a configuration example of a power conversion device 1C according to the fourth embodiment.
  • the power converter 1C and the motor 314 constitute a motor drive device 2C.
  • the drive section 320B is replaced with a drive section 320C
  • the control section 400A is replaced with a control section 400C.
  • the signal reception section 350 is replaced with a signal transmission/reception section 350C.
  • the signal transmitting section 420A is replaced with a signal transmitting/receiving section 420C.
  • the signal transmitting/receiving section 420C may be referred to as a "first transmitting/receiving section” and the signal transmitting/receiving section 350C may be referred to as a "second transmitting/receiving section.”
  • the signal transmitting/receiving section 350C has the function of the signal receiving section 350 described above, and further generates an implementation signal CV indicating that the switching characteristic change control has been performed, and transmits it to the signal transmitting/receiving section 420C of the control section 400C. do.
  • the control unit 400C can understand that the switching characteristics of the switching elements 311a to 311f have been changed because the signal transmitting/receiving unit 420C has received the implementation signal CV. That is, the control unit 400C can grasp the operating status of the switching element drive unit 340 and the signal transmitting/receiving unit 350C based on the execution signal CV.
  • Embodiment 4 a configuration in which a transmitting function is added to the drive unit side and a receiving function is added to the control unit side is applied to the configuration of Embodiment 3 shown in FIG. 17. It is also possible to apply the configuration of Form 2.
  • the control section transmits the first and second setting signals to the drive section.
  • the device also includes a first signal transmitting/receiving section that receives an execution signal from the driving section indicating that the switching element has been controlled to change the opening/closing characteristics.
  • the drive unit generates a control signal to operate the switching element drive unit based on the first and second setting signals received from the control unit, and also performs control to change the switching characteristics of the switching element.
  • a second signal transmitting/receiving section is provided that transmits an execution signal to the control section. This allows the control unit to grasp the operating status of the drive unit.
  • FIG. 19 is a diagram showing a configuration example of a refrigeration cycle application device 900 according to the fifth embodiment.
  • a refrigeration cycle application device 900 according to the fifth embodiment includes the power conversion device 1 described in the first embodiment.
  • Refrigeration cycle application equipment 900 according to Embodiment 5 can also include power converters 1A to 1C described in Embodiments 2 to 4.
  • the refrigeration cycle application device 900 according to the fifth embodiment can be applied to products including a refrigeration cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters. Note that in FIG. 19, components having the same functions as in the first embodiment are given the same reference numerals as in the first embodiment.
  • Refrigeration cycle application equipment 900 includes a compressor 315 with built-in motor 314 in Embodiment 1, a four-way valve 902, an indoor heat exchanger 906, an expansion valve 908, and an outdoor heat exchanger 910 that connect refrigerant piping 912. It is attached through.
  • a compression mechanism 904 that compresses the refrigerant and a motor 314 that operates the compression mechanism 904 are provided inside the compressor 315.
  • the refrigeration cycle applicable equipment 900 can perform heating operation or cooling operation by switching the four-way valve 902.
  • the compression mechanism 904 is driven by a variable speed controlled motor 314.
  • the refrigerant is pressurized by the compression mechanism 904 and sent out, passing through the four-way valve 902, indoor heat exchanger 906, expansion valve 908, outdoor heat exchanger 910, and four-way valve 902. Returning to the compression mechanism 904.
  • the refrigerant is pressurized by the compression mechanism 904 and sent out, passing through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906, and the four-way valve 902, as shown by the dashed arrow. Returning to the compression mechanism 904.
  • the indoor heat exchanger 906 acts as a condenser and releases heat, and the outdoor heat exchanger 910 acts as an evaporator and absorbs heat.
  • the outdoor heat exchanger 910 acts as a condenser and releases heat, and the indoor heat exchanger 906 acts as an evaporator and absorbs heat.
  • the expansion valve 908 reduces the pressure of the refrigerant and expands it.
  • the refrigeration cycle applicable equipment 900 can reduce the noise generated in the switching elements 311a to 311f by slowing down the opening/closing speed of the switching elements 311a to 311f.
  • switching elements 311a to 311a as shown in FIG.
  • the curve showing the characteristics of noise and loss generated in 311f etc. moves toward the upper right, and as a result, the loss increases. Therefore, the refrigeration cycle application equipment 900 can reduce the loss generated in the switching elements 311a to 311f by increasing the opening/closing speed of the switching elements 311a to 311f.
  • the digital gate driver configured by the switching element drive unit 340 and the switching elements 311a to 311f included in the drive unit 320 generates a surge voltage when the opening/closing speed is fast. becomes larger and generates more electromagnetic noise.
  • the refrigeration cycle application equipment 900 uses a combustible refrigerant, there is a possibility that the refrigerant will burn due to discharge caused by electromagnetic noise when the refrigerant leaks. Therefore, the refrigeration cycle application equipment 900 sets the opening/closing speed of the digital gate driver included in the power conversion device 1 according to the combustibility of the refrigerant used in the refrigeration cycle application equipment 900.
  • the refrigeration cycle application equipment 900 reduces the opening/closing speed of the digital gate driver included in the power converter 1 as the flammability of the refrigerant used in the refrigeration cycle application equipment 900 increases.
  • the refrigeration cycle applicable equipment 900 can reduce the surge voltage by slowing down the opening/closing speed of the digital gate driver, and by suppressing the occurrence of discharge caused by electromagnetic noise, even if refrigerant leaks from the refrigeration cycle applicable equipment 900. However, combustion can be prevented.
  • Refrigerants used in the refrigeration cycle application equipment 900 include, for example, R1234yf, R1234ze (E), R1243zf, HFO1123, HFO1132 (E), R1132a, CF3I, R290, R463A, R466A, R454A, R454B, and R454C.

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Abstract

Un dispositif de conversion de puissance (1) comprend un onduleur (310), une unité d'entraînement (320) et une unité de commande (400). L'unité d'entraînement (320) comprend une unité d'entraînement d'élément de commutation (340) qui modifie les caractéristiques d'ouverture/fermeture d'éléments de commutation (311a–311f) de l'onduleur (310) et entraîne les éléments de commutation (311a–311f). L'unité de commande (400) comprend une unité de génération de signal de base (410) qui génère un signal de base qui règle l'état ouvert/fermé d'au moins un élément de commutation parmi la pluralité d'éléments de commutation (311a-311f), une unité de réglage de caractéristiques d'ouverture/fermeture (430) qui génère un signal de réglage de caractéristiques d'ouverture/fermeture qui règle les caractéristiques d'ouverture/fermeture d'au moins un élément de commutation en fonction d'une quantité d'état qui indique l'état de fonctionnement du dispositif de conversion de puissance (1), et une unité de transmission de signal (420) qui génère un signal de commande pour faire fonctionner l'unité d'entraînement d'élément de commutation (340) sur la base du signal de base et du signal de réglage de caractéristiques d'ouverture/fermeture et transmet le signal de commande à l'unité d'entraînement d'élément de commutation (340).
PCT/JP2022/023983 2022-06-15 2022-06-15 Dispositif de conversion de puissance, dispositif d'entraînement de moteur et équipement utilisant un cycle de réfrigération WO2023243003A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014103485A (ja) * 2012-11-19 2014-06-05 Rohm Co Ltd スイッチ駆動回路
JP2017195741A (ja) * 2016-04-22 2017-10-26 三菱電機株式会社 電力変換装置の制御装置および制御方法
JP2019004617A (ja) * 2017-06-15 2019-01-10 三菱重工サーマルシステムズ株式会社 インバータ装置、空気調和機、インバータ装置の制御方法及びプログラム
JP2020057903A (ja) * 2018-10-01 2020-04-09 ローム株式会社 ドライバ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014103485A (ja) * 2012-11-19 2014-06-05 Rohm Co Ltd スイッチ駆動回路
JP2017195741A (ja) * 2016-04-22 2017-10-26 三菱電機株式会社 電力変換装置の制御装置および制御方法
JP2019004617A (ja) * 2017-06-15 2019-01-10 三菱重工サーマルシステムズ株式会社 インバータ装置、空気調和機、インバータ装置の制御方法及びプログラム
JP2020057903A (ja) * 2018-10-01 2020-04-09 ローム株式会社 ドライバ装置

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