WO2019155539A1 - 電力変換装置、並びにそれを用いたモータ駆動装置および冷凍機器 - Google Patents

電力変換装置、並びにそれを用いたモータ駆動装置および冷凍機器 Download PDF

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Publication number
WO2019155539A1
WO2019155539A1 PCT/JP2018/004152 JP2018004152W WO2019155539A1 WO 2019155539 A1 WO2019155539 A1 WO 2019155539A1 JP 2018004152 W JP2018004152 W JP 2018004152W WO 2019155539 A1 WO2019155539 A1 WO 2019155539A1
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WO
WIPO (PCT)
Prior art keywords
power
voltage
power supply
current
short circuit
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Application number
PCT/JP2018/004152
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English (en)
French (fr)
Japanese (ja)
Inventor
渉 初瀬
勇紀 江幡
正博 田村
橋本　浩之
貴郎 上田
田村　建司
Original Assignee
日立ジョンソンコントロールズ空調株式会社
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Application filed by 日立ジョンソンコントロールズ空調株式会社 filed Critical 日立ジョンソンコントロールズ空調株式会社
Priority to PCT/JP2018/004152 priority Critical patent/WO2019155539A1/ja
Priority to JP2019570189A priority patent/JP7159227B2/ja
Priority to TW107106505A priority patent/TWI699085B/zh
Publication of WO2019155539A1 publication Critical patent/WO2019155539A1/ja

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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present invention relates to a power conversion device that performs power conversion between AC power and DC power, a motor drive device that uses the power conversion device, and a refrigeration apparatus such as an air conditioner.
  • a power conversion device that performs power conversion using a switching element is used.
  • the current on the AC power supply side is used to improve efficiency and reduce harmonics. It is required to reduce waveform distortion.
  • the distortion of the current waveform is reduced by controlling the switching drive of the switching element for the boost operation.
  • conventional techniques for reducing distortion of a current waveform techniques described in Patent Document 1 and Patent Document 2 are known.
  • a semiconductor switching element in an oscillation circuit connected to the primary side of a high-frequency transformer is controlled according to an AC power supply current, and the output of the high-frequency transformer includes a full-wave rectifier circuit and a waveform positive / negative conversion circuit.
  • the output of the high-frequency transformer includes a full-wave rectifier circuit and a waveform positive / negative conversion circuit.
  • a sinusoidal AC power supply current waveform is obtained.
  • by stopping the driving of the switching elements constituting the positive / negative conversion circuit near the zero point of the AC power supply current distortion of the waveform of the AC power supply current near the zero current can be suppressed.
  • the conduction factor signal of the switching element in the boost chopper circuit is set according to the instantaneous value of the AC power supply current and the boost ratio.
  • the AC power supply current is sine wave without generating a reference waveform.
  • the present invention provides a power conversion device that can stably reduce the waveform distortion of an AC power supply current to make a sine wave, and a motor drive device and a refrigeration apparatus using the power conversion device.
  • a power conversion device performs a boosting operation for converting AC power from an AC power source into DC power and converting a DC output voltage to a voltage larger than the voltage of the AC power source.
  • a power conversion circuit unit that includes a short circuit that short-circuits the AC power supply via the reactor, and that performs a boost operation by switching the short circuit, and a current ratio of the short circuit, the power supply voltage of the AC power supply and the reactor And a control unit that is set in accordance with the voltage.
  • the power conversion device converts the AC power from the AC power source into DC power and performs a boosting operation that converts the DC output voltage to a voltage larger than the voltage of the AC power source.
  • a power conversion circuit unit that includes a semiconductor switching element and a reactor that stores energy when the semiconductor switching element is turned on, and performs a boosting operation by switching the semiconductor switching element; and a semiconductor switching element And a control unit for setting the conduction ratio of the semiconductor switching element according to a sine wave, and further comprising means for stopping the switching of the semiconductor switching element near the zero current of the power source current of the AC power source. Contains ingredients and higher order components.
  • a motor driving device drives a motor by a power converter, and the power converter converts AC power from an AC power source into DC power and outputs DC power.
  • a first power conversion circuit unit that includes a short circuit that performs a step-up operation that converts a voltage to a voltage that is greater than the voltage of the AC power source, short-circuits the AC power source via a reactor, and performs the step-up operation by switching the short circuit
  • a control unit that sets the conduction ratio of the short circuit according to the power supply voltage of the AC power supply and the voltage of the reactor, and a second power conversion circuit unit that converts the DC power into a variable voltage and variable frequency AC power And comprising.
  • a refrigeration apparatus includes a heat exchanger, a compressor that compresses and circulates a refrigerant, a fan that blows air to the heat exchanger, and a motor that drives the compressor or the fan. And a motor driving device for driving the motor, wherein the motor driving device is the motor driving device according to the present invention.
  • the waveform distortion of the AC power supply current can be stably reduced to a sine wave, it is possible to stably suppress harmonics generated by the power converter, the motor driving device using the power converter, and the refrigeration equipment. it can.
  • the circuit structure of the power converter device which is one Embodiment of this invention is shown.
  • An example of a power supply current waveform is shown.
  • the example of a waveform of a power supply current at the time of adding a tertiary component to a power supply current command value is shown.
  • a waveform example of a power supply current when a tertiary component is added to the power supply current command value is shown.
  • the circuit structure of the power converter device which is Example 1 is shown.
  • the circuit structure of the motor drive device which is Example 2 is shown. It is a block diagram of the refrigeration equipment which is Example 3.
  • FIG. 1 shows a circuit configuration of a power conversion device according to an embodiment of the present invention.
  • the power conversion circuit unit (main circuit unit) of the power conversion device 1 includes rectifier circuits configured by rectifier elements 3 a to 3 d to rectify AC power supplied from the AC power supply 2.
  • the rectifying elements 3a to 3d are diodes.
  • the AC power source 2 is connected to the AC input of the rectifier circuit via the reactor 4 in the power conversion device 1.
  • a short circuit 6 is connected between the AC inputs to short-circuit the AC input and control a short-circuit current flowing from the AC power supply 2 via the reactor 4.
  • a smoothing capacitor 5 that smoothes the output voltage of the rectifier circuit is connected to the DC output of the rectifier circuit.
  • the power converter 1 includes an AC power source current detector 7 that detects an AC power source current (hereinafter referred to as “power source current”) input from the AC power source 2, and an AC power source that detects an AC power source voltage input from the AC power source 2.
  • a voltage detector 8 and a DC output voltage detector 9 for detecting the DC output voltage of the rectifier circuit are provided.
  • the short circuit control unit 10 creates a short circuit command signal 10A for the short circuit 6 based on the detection current of the AC power supply current detector 7 and the detection voltages of the AC power supply voltage detector 8 and the DC output voltage detector 9. Output.
  • the pulse-off control unit 11 determines whether to stop the short-circuit command signal 10A, corrects the short-circuit command signal 10A according to the determination result, and outputs the corrected short-circuit command signal 11A.
  • the short circuit 6 can perform ON / OFF control of the bidirectional current according to the positive / negative of the AC power supply voltage.
  • the power converter 1 shown in FIG. 1 performs a boosting operation by driving the short circuit 6 by switching (on / off).
  • the short circuit 6 When the short circuit 6 is turned on, the AC power source 2 is short-circuited via the reactor 4, and thus a power source current flows through the closed circuit including the AC power source 2, the short circuit 6, and the reactor 4. At this time, the electric power from the AC power source 2, that is, electric energy, is stored in the reactor 4 as magnetic energy.
  • a power supply current flows through a path including the AC power supply 2, the rectifier circuit, the smoothing capacitor 5, and the reactor 4, and the energy accumulated in the reactor 4 is transferred to the smoothing capacitor 5 side through the rectifier circuit. Is released. At this time, an induced voltage proportional to the time change of the power supply current flowing through the reactor is generated in the reactor 4, so that a DC voltage larger than the voltage amplitude of the AC power supply 2 is output from the rectifier circuit.
  • the direction of the power supply current flowing to the AC side of the power converter 1 varies depending on the direction of the power supply current flowing when the short circuit 6 is turned on, that is, the voltage of the AC power supply 2.
  • the rectifier circuit full-wave rectifier circuit
  • the rectifier circuit composed of a bridge flows in one direction (the direction from the top to the bottom in the figure) through the DC side, that is, the smoothing capacitor.
  • the smoothing capacitor 5 is charged with a DC voltage larger than the voltage amplitude of the AC power supply 2.
  • the magnitude of the DC output voltage of the power conversion device 1 is controlled to a predetermined value by controlling the conduction rate (duty) when the short circuit 6 is ON.
  • the short circuit control unit 10 creates a command signal corresponding to the conduction ratio, and compares the command signal with a carrier signal (such as a triangular wave or a sawtooth wave) by pulse width modulation (PWM) to indicate the command signal indicated by the command signal.
  • PWM pulse width modulation
  • a short-circuit command signal 10A which is a pulse signal having a flow rate, is created.
  • “d” is a conduction ratio (duty) when the short circuit 6 is ON
  • “i s ” is an instantaneous value [A] of the power supply current
  • “L” is The inductance value [H] of the reactor 4
  • “v s ” is the instantaneous value [V] of the power supply voltage of the AC power supply 2
  • “E d ” is the voltage across the smoothing capacitor 5, that is, the DC output voltage [V].
  • “ ⁇ E d ” is the fluctuation component [V] of the DC output voltage.
  • a voltage controller for matching the E d to the command value E d * the current controller for matching the i s the command value i s * (sine wave)
  • a power source current is converted into a sine wave and a predetermined DC output voltage is obtained.
  • the technique of setting d by “d 1 ⁇ K
  • ” simplifies the configuration of the control device.
  • the control may become unstable depending on the switching frequency (PWM frequency) (for example, when the frequency is lowered).
  • the flow rate d is set as shown in Equation (2). According to the equation (2), the control is stabilized by using the voltage value.
  • Equation (2) “K pv ” is a proportional constant (voltage control gain), “v s * ” is a power supply voltage command value [A], and “i s * ” is a power supply current command value [A]. “E d * ” is the DC output voltage command value [A], and “ ⁇ E d * ” is the DC output voltage fluctuation command value.
  • V s * -L ⁇ (di s * / dt) in equation (2) is the voltage portion of the circuit of FIG. 1 (instantaneous value), a voltage as it were related to the sinusoidal waveform of the power supply current i s is there.
  • L ⁇ (di s * / dt) is the product of the inductance of the reactor 4 and the time rate of change of the power supply current, that is, the voltage of the reactor 4.
  • K pv (E d * + ⁇ E d * ) relates to voltage control of the DC output voltage.
  • v s * and i s * are set by the equations (3) and (4), respectively.
  • V s ⁇ 1st * is the power supply voltage fundamental wave amplitude.
  • I s ⁇ 1st * is the power source current fundamental wave amplitude.
  • ⁇ is the power source angular frequency, and “t” is time.
  • FIG. 2 shows an example of a power supply current waveform when the power conversion device of FIG. 1 is controlled by the conduction rate d according to the equation (2).
  • the power supply current can be converted into a sine wave.
  • the vibration component of the power supply current can be removed by a known filter circuit.
  • the short circuit control unit 10 stops the switching of the short circuit 6 when the AC power supply current detector 7 detects a power supply current near zero. Thereby, the distortion of the power supply current waveform near zero current is reduced.
  • this technique is a known technique, in the present embodiment, the slope (time change rate) of the power supply current near zero current is further reduced to approach zero. As a result, it is possible to suppress the occurrence of unexpected harmonics in the power supply current waveform due to the switching stop of the short circuit 6 becoming a disturbance to the boosting operation.
  • the magnitude of the slope of the supply current in the vicinity of zero current in order to reduce than the sine wave (fundamental wave), high-order component in the "i s *", for example, the formula Add tertiary components as shown in (5).
  • I s-3rd * is the power supply current tertiary command amplitude.
  • the magnitude of “I s-3rd * ” is set to a value smaller than “I s-1st * ”, for example, about one third of “I s-1st * ”.
  • Figure 3 shows the i s * to the power current command value, an example of the waveform of the power source current when added tertiary component as shown in Equation (5). However, the switching of the short circuit 6 is not stopped near the zero current.
  • the waveform example of Fig. 3 by adding a tertiary component i s * to the power current command value, the slope of the magnitude of the supply current of around zero current is reduced to a size close to zero.
  • the vibration component in this waveform example can be removed by a known filter circuit (the waveform example in FIG. 4 is also the same).
  • Figure 4 shows the i s * to the power current command value, an example of the waveform of the power source current when added tertiary component as shown in Equation (5). However, switching of the short circuit 6 is stopped in the vicinity of zero current.
  • the switching of the short circuit 6 is stopped when the slope of the power supply current near zero current is reduced to near zero. Thereby, even if switching of the short circuit 6 is stopped, generation of unexpected harmonics in the power supply current waveform can be suppressed.
  • the conduction ratio (duty) according to the voltage of a predetermined part in the circuit, in this embodiment, the voltage of the AC power supply 2 and the reactor 4, the power supply current The waveform can be sine wave reliably. Thereby, the efficiency of a power converter device improves. Furthermore, even if the switching operation is stopped in the vicinity of the zero current to reduce the waveform distortion by reducing the time change rate of the power supply current related to the voltage value of the reactor 4 near the zero current, an unexpected harmonic wave Can be suppressed.
  • means for applying a high-order component current sine wave in the case of conventional techniques, i.e., the command and the voltage controller for matching the E d to the command value E d *, the i s
  • the present invention can also be applied to the case where the power supply current is converted into a sine wave and a predetermined DC output voltage is obtained by using a current controller for matching the value i s * (sine wave).
  • the power conversion device has a reactor in which energy is stored when the semiconductor switching element (in the above-described embodiment, “short circuit 6”) is turned on, and the semiconductor switching element is switched (ON / OFF).
  • a power conversion circuit unit that performs a boosting operation and a control unit that sets the conduction ratio of the semiconductor switching element according to a sine wave current including a fundamental wave component and a higher-order component are provided.
  • FIG. 5 shows a circuit configuration of the power conversion device that is Embodiment 1 of the present invention.
  • the rectifier elements 3a to 3d constituting the rectifier circuit of the power conversion device 1A are MOSFETs (Metal / Oxide / Semiconductor / Field / Effect / Transistors) which are semiconductor switching elements, and diodes connected in reverse parallel to the MOSFETs. Consists of As the diode, a MOSFET built-in diode may be used. Further, the power conversion device 1A performs a boosting operation by driving these MOSFETs on and off. That is, the rectifier circuit including the rectifier elements 3 a to 3 d also serves as the short circuit 6.
  • MOSFETs Metal / Oxide / Semiconductor / Field / Effect / Transistors
  • the step-up operation of the power conversion device 1A is as follows.
  • the rectifying element 3c MOSFET
  • the rectifying element 3a diode
  • the smoothing capacitor 5 the rectifying element 3d (diode)
  • the reactor 4 A current flows, and the energy accumulated in the reactor 4 is released to the smoothing capacitor 5 side.
  • a DC voltage larger than the voltage amplitude of the AC power supply 2 is output from the rectifier circuit.
  • the short circuit 6 in the first embodiment can supply a power supply current to both by a MOSFET full bridge circuit.
  • a MOSFET full bridge circuit For example, when the direction of the voltage of the AC power supply 2 is downward in the figure, when the rectifier element 3d (MOSFET) is turned on to turn on the short circuit 6, the AC power supply 2, the reactor 4, the rectifier element 3d (MOSFET), the rectifier A power supply current flows through a closed circuit including the element 3b (diode). Thereby, energy is accumulated in the reactor 4.
  • a pair of MOSFETs may be turned on. Thereby, the power loss which generate
  • the operation of the MOSFET is the same as the so-called synchronous rectification operation when the energy of the reactor 4 is released, that is, when the short circuit 6 operates as a rectification circuit.
  • the magnitude of the DC output voltage of the power conversion device 1A controls the conduction ratio (duty) when each of the short circuit 6, that is, the rectifying element 3c (MOSFET) and the rectifying element 3d (MOSFET) is ON.
  • the short circuit control unit 10 creates a command signal corresponding to the conduction ratio, and compares the command signal with a carrier signal (such as a triangular wave or a sawtooth wave) by pulse width modulation (PWM) to indicate the command signal indicated by the command signal.
  • PWM pulse width modulation
  • a short-circuit command signal 10A which is a pulse signal having a flow rate, is created.
  • the conduction rate d is set by the above equation (2).
  • the switching operation of the rectifier element is stopped in the vicinity of the zero current of the power supply current in order to reduce the waveform distortion, and the slope of the power supply current in the vicinity of the zero current (time change rate). and in order to reduce than the sine wave (fundamental wave), high-order component in the "i s *" in the above equation (2), for example, as shown in the above equation (5) is added to the tertiary component.
  • FIG. 6 shows a circuit configuration of a motor drive device that is Embodiment 2 of the present invention.
  • the power conversion device 1 ⁇ / b> A of the first embodiment is connected as a DC power source to the DC side of the inverter device that drives the motor 100.
  • the main circuit of the inverter device is composed of a three-phase bridge circuit composed of six semiconductor switching elements 30a to 30f (MOSFETs in FIG. 6) each connected to a freewheeling diode.
  • the power converter 1A (FIG. 5) of the first embodiment is connected to the DC input side, and the motor 100 is connected to the AC output side.
  • AC power of constant voltage and constant frequency from the AC power source 2 is converted into DC power of a predetermined voltage by the power conversion device 1A. Further, the DC power is converted into AC power having a variable frequency and a variable voltage by driving the semiconductor switching elements 30a to 30f on and off. The motor 100 is driven at a variable speed by this AC power.
  • the inverter device controls the motor 100 to rotate at a desired speed.
  • the inverter control unit 50 calculates a motor current necessary for making the speed of the motor 100 coincide with the speed command value, and the detected motor current, that is, the motor in which the three-phase output current I uvw of the inverter device is calculated.
  • the on / off driving of the semiconductor switching elements 30a to 30f is controlled so as to match the current.
  • a three-phase AC motor such as an induction motor or a synchronous motor (for example, a permanent magnet synchronous motor) is applied.
  • An IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal Organic Field-effect transistor
  • a built-in diode may be used as the freewheeling diode.
  • the efficiency of the motor driving device is improved, Unexpected generation of harmonics in the motor drive device can be suppressed.
  • FIG. 7 is a configuration diagram of a refrigeration apparatus that is Embodiment 3 of the present invention.
  • the refrigeration equipment is a device that harmonizes temperatures, such as an air conditioner or a refrigerator.
  • the fan motor is driven by the motor driving device (FIG. 6) according to the second embodiment described above.
  • the refrigeration apparatus 300 includes heat exchangers 301 and 302, fans 303 and 304 for blowing air to these heat exchangers, a compressor 305 that compresses and circulates the refrigerant, It is arranged between the heat exchanger 301 and the heat exchanger 302, and between the compressor 305 and the heat exchangers 301 and 302, and includes a pipe 306 through which a refrigerant flows and a motor driving device 307.
  • Permanent magnet synchronous motors are used as fan motors that rotationally drive the fans 303 and 304.
  • a compressor motor 308 that drives the compressor 305 is disposed inside the compressor 305.
  • the motor driving device 307 includes a DC power supply circuit that converts AC power from a commercial AC power supply into DC power, and a compressor motor that converts the DC power from the DC power supply circuit into AC power and supplies the AC power to the compressor motor 308.
  • a drive inverter and a fan motor drive inverter that converts DC power into AC power from the DC power supply circuit and supplies the AC power to the fan motor are provided.
  • the above-described first embodiment (FIG. 5) is applied to the DC power supply circuit.
  • the above-described second embodiment (FIG. 6) is applied as the motor driving device 307 including the inverter.
  • the first and second DC power supply circuits independent from each other are provided, and the compressor motor drive inverter and the compressor motor drive inverter are respectively connected to the first DC power supply circuit and the second DC power supply circuit. You may make it receive direct-current power.
  • the efficiency of the refrigeration equipment is improved and an unexpected harmonic in the refrigeration equipment. Wave generation can be suppressed.
  • IGBT Insulated Gate Bipolar Transistor
  • SJ Super Junction
  • MOSFET Metal Organic Field-effect transistor
  • the semiconductor material constituting the semiconductor switching element may be a wide gap semiconductor such as SiC (Silicon Carbon) in addition to normal semiconductor silicon.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Inverter Devices (AREA)
PCT/JP2018/004152 2018-02-07 2018-02-07 電力変換装置、並びにそれを用いたモータ駆動装置および冷凍機器 WO2019155539A1 (ja)

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Application Number Priority Date Filing Date Title
PCT/JP2018/004152 WO2019155539A1 (ja) 2018-02-07 2018-02-07 電力変換装置、並びにそれを用いたモータ駆動装置および冷凍機器
JP2019570189A JP7159227B2 (ja) 2018-02-07 2018-02-07 電力変換装置、並びにそれを用いたモータ駆動装置および冷凍機器
TW107106505A TWI699085B (zh) 2018-02-07 2018-02-27 電力轉換裝置及使用其之馬達驅動裝置以及冷凍機器

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PCT/JP2018/004152 WO2019155539A1 (ja) 2018-02-07 2018-02-07 電力変換装置、並びにそれを用いたモータ駆動装置および冷凍機器

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10327576A (ja) * 1997-03-21 1998-12-08 Mitsubishi Electric Corp 交流−直流変換装置
JP2002095243A (ja) * 2000-09-13 2002-03-29 Sharp Corp 直流電源装置
JP2012028247A (ja) * 2010-07-27 2012-02-09 Eye Lighting Syst Corp 照明用点灯装置
JP2014220954A (ja) * 2013-05-10 2014-11-20 三菱電機株式会社 電力変換装置
JP2016073203A (ja) * 2014-09-30 2016-05-09 ダイキン工業株式会社 電力変換装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011024351A1 (ja) * 2009-08-26 2011-03-03 ダイキン工業株式会社 電力変換装置、及びその制御方法
JP6410835B2 (ja) * 2014-09-30 2018-10-24 三菱電機株式会社 電力変換装置
TWM510429U (zh) * 2015-06-25 2015-10-11 Lan Chang Electric Co Ltd 中央空調系統的交直流電源轉換控制模組
KR102543891B1 (ko) * 2015-08-10 2023-06-14 엘지전자 주식회사 전력변환장치 및 이를 구비하는 공기조화기

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10327576A (ja) * 1997-03-21 1998-12-08 Mitsubishi Electric Corp 交流−直流変換装置
JP2002095243A (ja) * 2000-09-13 2002-03-29 Sharp Corp 直流電源装置
JP2012028247A (ja) * 2010-07-27 2012-02-09 Eye Lighting Syst Corp 照明用点灯装置
JP2014220954A (ja) * 2013-05-10 2014-11-20 三菱電機株式会社 電力変換装置
JP2016073203A (ja) * 2014-09-30 2016-05-09 ダイキン工業株式会社 電力変換装置

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TW201935839A (zh) 2019-09-01
JP7159227B2 (ja) 2022-10-24

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