WO2020070850A1 - Circuit de conversion de puissance et climatiseur - Google Patents

Circuit de conversion de puissance et climatiseur

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Publication number
WO2020070850A1
WO2020070850A1 PCT/JP2018/037149 JP2018037149W WO2020070850A1 WO 2020070850 A1 WO2020070850 A1 WO 2020070850A1 JP 2018037149 W JP2018037149 W JP 2018037149W WO 2020070850 A1 WO2020070850 A1 WO 2020070850A1
Authority
WO
WIPO (PCT)
Prior art keywords
reverse voltage
voltage application
switching element
switching elements
main circuit
Prior art date
Application number
PCT/JP2018/037149
Other languages
English (en)
Japanese (ja)
Inventor
勇紀 江幡
橋本　浩之
Original Assignee
日立ジョンソンコントロールズ空調株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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/JP2018/037149 priority Critical patent/WO2020070850A1/fr
Priority to TW108103453A priority patent/TWI785198B/zh
Publication of WO2020070850A1 publication Critical patent/WO2020070850A1/fr

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Classifications

    • 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
    • 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
    • H02M7/21—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • 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
    • H02M7/21—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration

Definitions

  • the present invention relates to a power conversion circuit and an air conditioner.
  • An auxiliary power supply having a lower voltage value than the DC voltage source; a reverse voltage applying switching element which is turned on at the time of reverse recovery of the return diode and has a withstand voltage lower than that of the main circuit switching element;
  • a main circuit switching control circuit for switching the main circuit switching element having a short pause period for turning off both of the circuit switching elements, and the reverse voltage application switching during a pause period starting from a time point when the main circuit switching element is turned off.
  • a reverse voltage application switching control circuit that turns on the element and turns off after the elapse of the pause period.
  • power loss can be suppressed when converting an AC voltage to a DC voltage.
  • FIG. 2 is a circuit diagram of the AC / DC converter according to the first embodiment of the present invention. It is a wave form diagram of each part in a 1st embodiment.
  • FIG. 5 is a circuit diagram of an AC / DC converter according to a second embodiment of the present invention. It is a wave form diagram of each part in a 1st embodiment. It is a schematic diagram of an air conditioner according to a third embodiment of the present invention.
  • DD1 to DD4 four reverse voltage application circuits 71 to 74, a converter control circuit 180 (control unit), a driver circuit 172, a reactor 174, a smoothing capacitor 176, a current detection unit 177, and a voltage detection unit 178.
  • the switching elements QD1 to QD4 and other switching elements to be described later are all MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors).
  • the gate-source voltages of the switching elements QD1 and QD2 are referred to as VgsQD1 and VgsQD2, respectively.
  • the AC power supply 162 is, for example, a commercial power supply, and an AC voltage output from the AC power supply 162 is applied between the AC terminals 60A and 60B.
  • Smoothing capacitor 176 is connected between DC terminals 62P and 62N, and smoothes output voltages of switching elements QD1 to QD4.
  • the terminal voltage of the smoothing capacitor 176 is called a main DC voltage VE (DC voltage).
  • the load device 164 is connected to the DC terminals 62P and 62N.
  • the switching elements QD1 and QD2 are connected in series between the DC terminals 62P and 62N. Similarly, switching elements QD3 and QD4 are also connected in series between DC terminals 62P and 62N.
  • One end of reactor 174 is connected to AC terminal 60A, and the other end of reactor 174 is connected to a connection point of switching elements QD1 and QD2.
  • the connection point between the switching elements QD3 and QD4 is connected to the AC terminal 60B.
  • the voltage instantaneous value at the other end of reactor 174 is referred to as AC voltage instantaneous value vs. AC terminal 60B as a reference.
  • the instantaneous value of the current flowing from the AC power supply 162 to the AC / DC converter 100 is referred to as the instantaneous value of the alternating current is.
  • the freewheel diodes DD1 to DD4 are connected in anti-parallel to the switching elements QD1 to QD4, respectively.
  • the reverse voltage applying circuits 71 to 74 are connected in parallel to the freewheel diodes DD1 to DD4, respectively.
  • the reverse voltage applying circuits 71 to 74 apply a reverse voltage lower than the main DC voltage VE to the freewheel diodes DD1 to DD4 when the corresponding freewheel diodes DD1 to DD4 perform reverse recovery, thereby suppressing the reverse recovery loss. .
  • Converter control circuit 180 includes main circuit control signals SD1 to SD4 for controlling ON / OFF states of switching elements QD1 to QD4, and reverse voltage control signals SE1 to SE4 for controlling operations of reverse voltage application circuits 71 to 74. Output.
  • converter control circuit 180 stores the target value of main DC voltage VE, and sets the duty ratio of switching elements QD1 to QD4 such that main DC voltage VE approaches the target value.
  • the driver circuit 172 buffers the main circuit control signals SD1 to SD4 and the reverse voltage control signals SE1 to SE4, and outputs the results as voltage signals VD1 to VD4 and VE1 to VE4.
  • the current detector 177 detects the AC instantaneous value is, and the voltage detector 178 detects the AC voltage instantaneous value vs.
  • the reverse voltage application circuit 71 will be described.
  • FIG. 1 it is assumed that the switching element QD1 is in the off state and a forward return current flows through the diode DD1.
  • a reverse voltage is applied to the diode DD1.
  • a reverse current flows due to the residual charge of the diode DD1.
  • This reverse current is called a reverse recovery current
  • the loss due to the reverse recovery current is called a reverse recovery loss.
  • the reverse voltage application circuit 71 is provided to cope with this problem. That is, when the reverse recovery current flows through the diode DD1, the reverse voltage application circuit 71 applies a reverse voltage lower than the main DC voltage VE to the diode DD1 to reduce the reverse recovery current and the reverse recovery loss. Is what you do.
  • the DC power supply 22 outputs a DC voltage VG lower than the main DC voltage VE at the DC terminals 62P and 62N described above.
  • the effective value of the main DC voltage VE is about 300 [V]
  • the DC voltage VG is 1/10 or less of the voltage, for example, 5V to 24V. [V] or so.
  • the resistor 24 and the capacitor 26 constitute a filter circuit for removing a noise component from the DC voltage VG.
  • Switching element 28 (reverse voltage application switching element) is turned on / off by voltage signal VE1 supplied from converter control circuit 180 via driver circuit 172.
  • the diode 30 is a freewheel diode of the switching element 28.
  • the diode 34 (reverse voltage application diode) is connected between the source terminal of the switching element 28 and the drain terminal of the switching element QD1 to prevent backflow.
  • the switching element 28 has a lower withstand voltage than the switching elements QD1 to QD4 in order to switch the DC voltage VG output from the DC power supply 22.
  • a diode having a shorter reverse recovery time than the freewheeling diodes DD1 to DD4 is employed.
  • a wide band gap semiconductor silicon carbide, gallium nitride, gallium oxide, or the like
  • the other reverse voltage applying circuits 72 to 74 are not shown, they are configured similarly to the reverse voltage applying circuit 71.
  • the synchronous rectification mode is an operation mode in which the on / off state of the switching elements QD1 to QD4 is switched every half cycle of the instantaneous AC voltage value vs according to the polarity of the instantaneous AC voltage value vs. That is, when instantaneous AC voltage value vs is a positive value, converter control circuit 180 turns on switching elements QD1 and QD4 and turns off switching elements QD2 and QD3.
  • the current flows through the reactor 174, the switching element QD1, the load device 164, and the switching element QD4 sequentially, and returns to the AC power supply 162.
  • converter control circuit 180 turns on switching elements QD2 and QD3 and turns off switching elements QD1 and QD4.
  • the current flows through the switching element QD3, the load device 164, the switching element QD2, and the reactor 174 sequentially, and returns to the AC power supply 162.
  • the synchronous rectification mode may be used when the delay of the current phase due to the reactor 174 is not significant, for example, when the amplitude value of the AC current instantaneous value is is less than a predetermined threshold.
  • the switching mode is an operation mode in which the power factor of the AC / DC converter 100 is to be improved.
  • converter control circuit 180 complementarily switches on / off states of switching elements QD1 and QD2 a plurality of times within a half cycle of AC voltage instantaneous value vs.
  • a dead time period occurs in which both the switching elements QD1 and QD2 are in the OFF state.
  • converter control circuit 180 controls the on / off states of switching elements QD3 and QD4 so as to be the same as those in the synchronous rectification mode described above.
  • converter control circuit 180 keeps switching element QD3 in the off state, keeps switching element QD4 in the on state, and complements the on / off state of switching elements QD1 and QD2. Switch multiple times.
  • the frequency fw may be about 2 to 3 times the frequency fs, It may be about several hundred times.
  • the frequency fw may be set to 10 kHz to 20 kHz.
  • switching elements QD1 and QD4 are both on and the switching elements QD2 and QD3 are both off, current flows as in the case of the synchronous rectification mode described above.
  • switching elements QD2 and QD4 are both on and switching elements QD1 and QD3 are both off, the current supplied from AC power supply 162 causes reactor 174, switching element QD2, and switching element QD4 to pass through. The sequence returns to the AC power supply 162 in sequence.
  • the reactor 174 is directly connected to the AC power supply 162 without passing through the load device 164, and a large current can flow through the reactor 174.
  • the energy supplied to the reactor 174 as a current is stored in the reactor 174 as a magnetic flux, and then supplied to the load device 164 as a current when both the switching elements QD1 and QD4 are turned on.
  • the synchronous rectification mode may be employed when the delay of the current phase due to the reactor 174 is conspicuous as deterioration of the power factor, for example, when the amplitude value of the instantaneous AC current value is is equal to or larger than the above-described threshold value.
  • converter control circuit 180 sets reverse voltage control signals SE1 to SE4 to high level in synchronization with the timing when freewheeling diodes DD1 to DD4 perform reverse recovery.
  • the reverse voltage applying circuits 71 to 74 apply a reverse voltage lower than the main DC voltage VE to the freewheel diodes DD1 to DD4 when the freewheel diodes DD1 to DD4 perform reverse recovery. Suppress.
  • FIG. 2 is a waveform diagram of each part of the AC / DC converter 100 in the switching mode.
  • main circuit control signals SD1 and SD2 are signals output from converter control circuit 180 to control switching elements QD1 and QD2, as described above.
  • the state before time t0 in FIG. 2 assumes that the polarity of the instantaneous alternating current value is is “positive” (the direction shown in FIG. 1) and the switching elements QD2 and QD4 are on. That is, in FIG. 1, it is assumed that the current flowing from the AC terminal 60A flows out of the AC terminal 60B via the reactor 174 and the switching elements QD2 and QD4 in sequence.
  • the gate-source voltage VgsQD1 of the switching element QD1 gradually rises from time t4 to time t10.
  • the gate-source voltage VgsQD1 does not change during a period until time t4, but this period is a delay time in the driver circuit 172.
  • voltage VgsQD1 gradually increases. This period is a period during which the gate-source capacitance of the switching element QD1 is charged.
  • the voltage VgsQD1 is substantially constant. This is because the mirror effect appears in the switching element QD1.
  • the period from time t6 to t8 is called a mirror period.
  • a reverse recovery current flows through the diode DD1.
  • the timing at which the reverse recovery current can actually occur varies depending on conditions such as the ambient temperature.
  • the gate-source voltage VgsQA1 of the switching element QA1 is stabilized, it is considered that the drain-source voltage is also stable, so the reverse recovery occurs within the period from time t0 to t10. it is conceivable that.
  • timings such as times t4, t6, t8, and t10 in the drawing vary depending on conditions such as ambient temperature and noise. Therefore, in the present embodiment, constants and the like of the respective components are set so that reverse recovery can occur until time t12, which is a time margin obtained by adding a margin to time t10.
  • the reverse voltage control signal SE1 is a signal that rises at time t1 and falls at time t12.
  • the driver circuit 172 (see FIG. 1) outputs a voltage signal VE1 (not shown) having substantially the same waveform as the reverse voltage control signal SE1, and the switching element 28 (see FIG. 1) is turned on / off by the voltage signal VE1.
  • the current flowing through the diode 34 in the reverse voltage application circuit 71 is called a current ig.
  • the current ig has a positive value during the period from time t1 to time t2.
  • the current ig during this period is a reverse recovery current that flows through the diode DD1 via the diode 34 when the diode DD1 enters the reverse recovery state.
  • the current ig has a negative value during the period from time t6 to time t8.
  • the current ig during this period is a reverse recovery current generated by the reverse recovery of the diode 34 itself.
  • the current ih indicated by a broken line in FIG. 2 is an example of a reverse recovery current flowing through the diode DD1 by the main DC voltage VE when the reverse voltage application circuit 71 is not provided.
  • the reverse recovery current (current ig during the period from time t1 to t2) generated in the diode DD1 and the reverse recovery current (current ig during the period from time t6 to t8) generated in the diode 34 are determined. Even if they are combined, the current value can be greatly reduced as compared with the reverse recovery current ih indicated by the broken line, whereby the reverse recovery loss can be significantly suppressed.
  • the AC / DC converter 100 includes the plurality of freewheel diodes (DD1 to DD4) connected in anti-parallel to each of the plurality of main circuit switching elements (QD1 to QD4), and at least a part thereof.
  • a reverse voltage lower than the DC voltage (VE) output to the load device (164) is supplied to the corresponding freewheeling diode. (DD1 to DD4), and a control unit (180) for controlling the reverse voltage application circuits (71 to 74).
  • FIG. 3 is a circuit diagram of an AC / DC converter 170 (power conversion circuit) according to the second embodiment of the present invention.
  • the AC / DC converter 170 converts AC power supplied from an AC power supply 162 (AC system) into DC power, and loads the load device. 164.
  • the AC / DC converter 170 includes reverse voltage applying circuits 51 to 54 instead of the reverse voltage applying circuits 71 to 74 in the first embodiment.
  • the reverse voltage application circuit 51 includes the capacitor 32.
  • the capacitor 32 is connected between the source terminal of the switching element 28 and the source terminal of the switching element QD1.
  • the other reverse voltage application circuits 52 to 54 have the same configuration as the reverse voltage application circuit 51.
  • the configuration of the AC / DC converter 170 other than that described above is the same as that of the AC / DC converter 100 of the first embodiment.
  • FIG. 4 is a waveform diagram of each part in the switching mode of the AC / DC converter 170.
  • the waveforms of the main circuit control signals SD1 and SD2 and the gate-source voltages VgsQD1 and VgsQD2 are those of the first embodiment (FIG. Reference).
  • the waveform of the reverse voltage control signal SE1 in the present embodiment is different from that of the first embodiment. That is, in the present embodiment, the reverse voltage control signal SE1 rises from a low level to a high level at time t0, and falls from a high level to a low level at time t2.
  • the reverse voltage control signal SE1 is maintained at the high level during the period from the time t1 to the time t12 when the diode DD1 is likely to be in the reverse recovery state (see FIG. 2).
  • the waveform of the voltage signal VE1 (see FIG. 1) supplied to the switching element 28 is disturbed.
  • the switching element 28 is turned off even though the diode DD1 is in the reverse recovery state.
  • a large reverse recovery current flows through the diode DD1 due to the main DC voltage VE, and the reverse recovery loss also increases.
  • the reverse voltage application circuit (51 to 54) in this embodiment is charged after the reverse voltage application switching element (28) is turned on, and is charged after the reverse voltage application switching element (28) is turned off.
  • the control unit (180) further includes a discharged capacitor (32), and the control unit (180) performs a reverse operation during a dead time period (t0 to t2) in which both the first and second main circuit switching elements (QD1 and QD2) are turned off.
  • the voltage application switching element (28) is set to the ON state, and the reverse voltage application switching element (28) is set to the OFF state before the dead time period (t0 to t2) ends.
  • the gaseous refrigerant that has flowed into the outdoor heat exchanger 963 exchanges heat with outdoor air supplied by the outdoor fan 965 and is condensed to be a liquid refrigerant.
  • This liquid refrigerant flows into the indoor unit 970 through the outdoor expansion valve 964 and the liquid pipe 984 in the fully opened state.
  • MOSFETs were applied as the switching elements 28 and QD1 to QD4.
  • the switching elements are not limited to MOSFETs, but may be IGBTs, bipolar transistors, or the like.
  • the reverse voltage applying circuits 51 to 54 and 71 to 74 are connected in parallel to all the freewheel diodes DD1 to DD4.
  • a reverse voltage application circuit may be connected only to the return diode.
  • the reverse voltage applying circuits 51, 52, 71, 72 corresponding to the switching elements QD1, QD2 whose on / off states are complementarily switched in the switching mode are provided, and the other reverse voltage applying circuits 53, 54, 73 are provided.
  • , 74 may be omitted. This is because the diodes DD1 and DD2 reversely connected to the switching elements QD1 and QD2 frequently perform reverse recovery as compared with the other diodes DD3 and DD4.
  • the cost of the AC / DC converters 100 and 170 can be reduced.
  • the reverse voltage control signal SE1 has fallen at or before the time t2 (see FIG. 2). However, the reverse voltage control signal SE1 may fall after time t2.
  • the converter control circuit 180 in each of the above embodiments may perform control to suppress the reverse recovery loss not only in the switching mode but also in either the synchronous rectification mode or the diode rectification mode of the above-described modification. That is, the converter control circuit 180 applies a reverse voltage lower than the main DC voltage VE to the freewheeling diodes DD1 to DD4 when the freewheeling diodes DD1 to DD4 perform reverse recovery in the synchronous rectification mode or the diode rectification mode, Thereby, the reverse recovery loss may be suppressed.
  • the off timing of the reverse voltage control signal SE1 may be a timing later than the time t2.
  • Switching element (reverse voltage application switching element) 32 Capacitor 34 Diode (reverse voltage application diode) 51 to 54, 71 to 74 Reverse voltage application circuit 100, 170 AC / DC converter (power conversion circuit) 162 AC power supply (AC system) 164 Load device 174 Reactor 180 Converter control circuit (control unit) DD1 to DD4 freewheeling diode QD1 switching element (first main circuit switching element) QD2 switching element (second main circuit switching element) QD3 switching element (third main circuit switching element) QD4 switching element (fourth main circuit switching element) VE Main DC voltage (DC voltage)

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

Afin de supprimer la perte de puissance au moment de la conversion d'une tension alternative en une tension continue, la présente invention comprend : une pluralité d'éléments de commutation de circuit principal (QD1-QD4) pour convertir une alimentation en CA fournie par un système CA (162) en une alimentation en CC et pour fournir l'alimentation en CC à un dispositif de charge (164) ; un réacteur (174) connecté entre les éléments de commutation de circuit principal (QD1-QD4) et le système CA (162) ; une pluralité de diodes de reflux (DD1-DD4) qui sont connectées en parallèle inverse respectivement à la pluralité d'éléments de commutation de circuit principal (QD1-QD4) ; des circuits d'application de tension inverse (71-74) qui sont chacun connectés à au moins l'une des diodes de reflux (DD1-DD4), et qui appliquent une tension inverse inférieure à la tension continue (VE) à délivrer au dispositif de charge (164), aux diodes de reflux (DD1-DD4) correspondantes lorsque les diodes de reflux (DD1-DD4) correspondantes sont coupées ; et une unité de commande (180) qui commande les circuits d'application de tension inverse (71-74).
PCT/JP2018/037149 2018-10-04 2018-10-04 Circuit de conversion de puissance et climatiseur WO2020070850A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2018/037149 WO2020070850A1 (fr) 2018-10-04 2018-10-04 Circuit de conversion de puissance et climatiseur
TW108103453A TWI785198B (zh) 2018-10-04 2019-01-30 電力轉換電路及空調機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/037149 WO2020070850A1 (fr) 2018-10-04 2018-10-04 Circuit de conversion de puissance et climatiseur

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WO2020070850A1 true WO2020070850A1 (fr) 2020-04-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10327585A (ja) * 1997-05-23 1998-12-08 Toshiba Corp 電力変換装置
WO2006052032A1 (fr) * 2004-11-15 2006-05-18 Kabushiki Kaisha Toshiba Convertisseur de puissance
WO2018074274A1 (fr) * 2016-10-19 2018-04-26 日立ジョンソンコントロールズ空調株式会社 Dispositif de conversion de puissance et climatiseur

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Publication number Priority date Publication date Assignee Title
WO2011121653A1 (fr) * 2010-03-31 2011-10-06 日立アプライアンス株式会社 Convertisseur, module d'entraînement de moteur, et appareil de réfrigération
JP5264849B2 (ja) * 2010-09-27 2013-08-14 三菱電機株式会社 電力変換装置及び冷凍空気調和装置
US8788103B2 (en) * 2011-02-24 2014-07-22 Nest Labs, Inc. Power management in energy buffered building control unit
JP5115636B2 (ja) * 2011-05-02 2013-01-09 ダイキン工業株式会社 電力変換回路および空気調和装置
CN105052027A (zh) * 2013-04-02 2015-11-11 三菱电机株式会社 电力变换装置以及制冷空气调节装置
JP5825319B2 (ja) * 2013-10-16 2015-12-02 ダイキン工業株式会社 電力変換装置ならびに空気調和装置
KR101804713B1 (ko) * 2013-10-18 2018-01-10 미쓰비시덴키 가부시키가이샤 직류 전원 장치, 전동기 구동 장치, 공기 조화기 및 냉장고

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10327585A (ja) * 1997-05-23 1998-12-08 Toshiba Corp 電力変換装置
WO2006052032A1 (fr) * 2004-11-15 2006-05-18 Kabushiki Kaisha Toshiba Convertisseur de puissance
WO2018074274A1 (fr) * 2016-10-19 2018-04-26 日立ジョンソンコントロールズ空調株式会社 Dispositif de conversion de puissance et climatiseur

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TW202015324A (zh) 2020-04-16

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