JP2010093881A - Converter with improved three-phase power factor - Google Patents

Converter with improved three-phase power factor Download PDF

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JP2010093881A
JP2010093881A JP2008259230A JP2008259230A JP2010093881A JP 2010093881 A JP2010093881 A JP 2010093881A JP 2008259230 A JP2008259230 A JP 2008259230A JP 2008259230 A JP2008259230 A JP 2008259230A JP 2010093881 A JP2010093881 A JP 2010093881A
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power factor
converter
converters
choke coil
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JP5213626B2 (en
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Ekito Go
益東 呉
Hagumu Oba
育 大葉
Kimisada Kobayashi
公禎 小林
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Shindengen Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase power factor improved converter that has high efficiency and can balance the suppression of higher harmonic components of a three-phase current and each phase current. <P>SOLUTION: In the three-phase power factor improved converter, in which three sets 1, 17, and 18 of power factor improved converters having harmonic suppressing functions are connected between each phase of three-phase three-line AC power supplies and the next, common mode choke coils L1, L2, and L3 are connected to the input parts of power factor improved converters 1, 17, and 18, and a rectifier circuit 2 is connected via a choke coil 3 to the output of this common mode choke coil, and DC/DC converters 8, 19, and 20 are connected to the outputs of the power factor improved converters 1, 17, and 18, and the individual outputs of the DC/DC converters 8, 19, and 20 are connected in parallel, and further it has a control circuit 30, which controls the DC/DC converters 8, 19, and 20 by a common output voltage detection error signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は，三相３線式交流給電における高調波電流抑制機能を備えた三相力率改善形コンバータに関するものである。   The present invention relates to a three-phase power factor improving converter having a harmonic current suppressing function in a three-phase three-wire AC power supply.

三相３線式交流給電において，単相の高調波抑制機能を有する入出力絶縁型コンバータ、いわゆる力率改善形コンバータ３台を各相間に接続し，その各出力を並列に接続して，電源回路を構成する方法が知られている。   In three-phase, three-wire AC power supply, connect three input / output isolated converters with a single-phase harmonic suppression function, so-called power factor improving converters, between each phase, and connect their outputs in parallel. Methods for constructing a circuit are known.

この回路構成で各コンバータに制御回路を個別に持たせた場合，各相の電流バランス，すなわち，各コンバータが分担する負荷電流は必ずしも同一にならない。したがって電流バランスをとる機能が必要となる。   When each converter is individually provided with a control circuit in this circuit configuration, the current balance of each phase, that is, the load current shared by each converter is not necessarily the same. Therefore, a function for balancing current is required.

各相のＤＣ／ＤＣコンバータの主スイッチを同一の制御信号で駆動し，昇圧チョッパ回路の出力電圧のレギュレーションにより各相の電流をバランスさせるものが存在する（例えば、特許文献１参照）。   There is a type in which the main switch of each phase DC / DC converter is driven by the same control signal, and the current of each phase is balanced by regulating the output voltage of the step-up chopper circuit (see, for example, Patent Document 1).

図３は従来の三相３線式交流給電方式のコンバータの一例を示す回路図である。この三相３線式交流給電方式のコンバータは、高調波抑制機能を有した力率改善形コンバータ１，１７，１８を備えてある。三相３線式交流電源各相（Ｕ相、Ｖ相、Ｗ相）間に，これら力率改善形コンバータ１，１７，１８を接続してある。力率改善形コンバータ１，１７，１８の出力は各々ＤＣ／ＤＣコンバータ８，１９，２０の入力に接続されている。各ＤＣ／ＤＣコンバータ８，１９，２０の出力は並列に接続され負荷１６に直流電力を供給する。   FIG. 3 is a circuit diagram showing an example of a conventional three-phase three-wire AC power feeding converter. This three-phase three-wire AC power supply type converter includes power factor improving converters 1, 17, and 18 having a harmonic suppression function. These power factor improving converters 1, 17 and 18 are connected between each phase (U phase, V phase, W phase) of the three-phase three-wire AC power source. The outputs of power factor improving converters 1, 17 and 18 are connected to the inputs of DC / DC converters 8, 19 and 20, respectively. The outputs of the DC / DC converters 8, 19 and 20 are connected in parallel to supply DC power to the load 16.

力率改善形コンバータ１，１７，１８は各々整流回路２，チョークコイル３，平滑用コンデンサ６，及び制御回路７を備えてある。整流回路２は、２つのアームで構成し、各アームは少なくともＭＯＳＦＥＴで構成したスイッチング素子２１，２２のドレイン端子とダイオードで構成する整流素子２３，２４のアノード端子とを接続してある。また、整流回路２の出力電圧が一定化するように、スイッチング素子２１，２２のオン・オフを制御する制御回路７をスイッチング素子２１，２２のゲート端子及びソース端子に接続してある。   Each of the power factor improving converters 1, 17 and 18 includes a rectifier circuit 2, a choke coil 3, a smoothing capacitor 6, and a control circuit 7. The rectifier circuit 2 is composed of two arms, and each arm is connected to the drain terminals of switching elements 21 and 22 composed of at least MOSFETs and the anode terminals of rectifier elements 23 and 24 composed of diodes. Further, a control circuit 7 for controlling on / off of the switching elements 21 and 22 is connected to the gate terminals and the source terminals of the switching elements 21 and 22 so that the output voltage of the rectifier circuit 2 is constant.

ＤＣ／ＤＣコンバータ部８，１９，２０はそれぞれ同時にオン・オフする主スイッチ９，１０、トランス１１、整流ダイオード１２、フライホイールダイオード１３、平滑用チョークコイル１４、平滑用コンデンサ１５で構成されるフォワードコンバータである。このＤＣ／ＤＣコンバータ部８，１９，２０はＤＣ／ＤＣコンバータ部８，１９，２０の主スイッチ９，１０のオン・オフを一括制御する制御回路３０を備えてある。この制御回路３０は誤差増幅器を備え、この誤差増幅器で出力電圧を基準値と比較しその誤差を増幅する。誤差増幅器からの増幅信号はパルス幅制御回路に送られ，出力電圧を一定に保つために必要なコンバータのパルス幅を決める。   The DC / DC converter units 8, 19 and 20 are respectively composed of main switches 9 and 10 which are simultaneously turned on and off, a transformer 11, a rectifier diode 12, a flywheel diode 13, a smoothing choke coil 14 and a smoothing capacitor 15. It is a converter. The DC / DC converter units 8, 19, and 20 include a control circuit 30 that collectively controls on / off of the main switches 9 and 10 of the DC / DC converter units 8, 19, and 20. The control circuit 30 includes an error amplifier, which compares the output voltage with a reference value and amplifies the error. The amplified signal from the error amplifier is sent to a pulse width control circuit to determine the converter pulse width necessary to keep the output voltage constant.

３個のＤＣ／ＤＣコンバータ８，１９，２０は同一のパルスで駆動されるため，ＤＣ／ＤＣコンバータ８，１９，２０の入力電圧，すなわち力率改善形コンバータ１，１７，１８の出力電圧が一定で，各部品の特性が同じであれば，各ＤＣ／ＤＣコンバータ８，１９，２０の電流はバランスし，これらの入力電源である力率改善形コンバータ１，１７，１８の電流もバランスする。
特開２００３−３３３８５５号公報 Since the three DC / DC converters 8, 19, and 20 are driven with the same pulse, the input voltage of the DC / DC converters 8, 19, and 20, that is, the output voltages of the power factor improving converters 1, 17, and 18 are If the characteristics of each component are the same, the currents of the DC / DC converters 8, 19, and 20 are balanced, and the currents of the power factor improving converters 1, 17, and 18 that are the input power sources are also balanced. .
JP 2003-333855 A

しかしながら，このような従来のブリッジレス回路方式では、Ｖ相を基準にした場合、Ｕ相からＶ相へ供給する供給電流ＩＵ−ＶとＷ相からＶ相へ供給する供給電流ＩＷ−Ｖとがあるが、互いの供給電流により、力率改善形コンバータ１７に有するチョークコイル３のインダクタンスの電位分差が発生して、安定電位を変動させる。そのため、図５に示すように、３つの力率改善形コンバータ１，１７，１８の各相電流のバランスが不安定であり、入力歪率（ＴＨＤ）が高く、三相電流の高調波成分が基準以上となるという課題を有する。 However, in such a conventional bridgeless circuit system, when referenced to V-phase, supply current supplied from the supply current I U-V and W-phase supplied to the V phase from the U phase to the V phase I W-V However, due to the mutual supply currents, a potential difference of the inductance of the choke coil 3 included in the power factor improving converter 17 is generated, and the stable potential is changed. Therefore, as shown in FIG. 5, the balance of the phase currents of the three power factor improving converters 1, 17 and 18 is unstable, the input distortion factor (THD) is high, and the harmonic component of the three-phase current is high. There is a problem of exceeding the standard.

本発明は、上記問題に鑑みてなされたものであり、高効率を得ると同時に、三相電流の高調波成分の抑制と各相電流のバランスも図ることができる三相力率改善形コンバータを提供することを目的とする。   The present invention has been made in view of the above problems, and provides a three-phase power factor improvement type converter that can achieve high efficiency and at the same time suppress harmonic components of the three-phase current and balance each phase current. The purpose is to provide.

上記課題を解決するために、本発明に係る三相力率改善形コンバータは、三相３線式交流電源各相間に，高調波抑制機能を有した力率改善形コンバータ３組を接続した三相力率改善形コンバータにおいて，前記力率改善形コンバータの各相入力部にコモンモードチョークコイルを接続し、このコモンモードチョークコイルの出力にはチョークコイルを介して整流回路を接続し、前記力率改善形コンバータの出力にＤＣ／ＤＣコンバータを接続し，前記ＤＣ／ＤＣコンバータの各出力を並列接続し，かつ前記ＤＣ／ＤＣコンバータを共通の出力電圧検出誤差信号により制御する制御回路を有することを特徴とする。   In order to solve the above-mentioned problems, a three-phase power factor improving converter according to the present invention is a three-phase power factor improving converter in which three sets of power factor improving converters having a harmonic suppression function are connected between each phase of a three-phase three-wire AC power source. In the phase power factor improving converter, a common mode choke coil is connected to each phase input portion of the power factor improving converter, and a rectifier circuit is connected to the output of the common mode choke coil via the choke coil. A control circuit for connecting a DC / DC converter to the output of the rate improving converter, connecting the outputs of the DC / DC converter in parallel, and controlling the DC / DC converter by a common output voltage detection error signal; It is characterized by.

前記整流回路は、２つのアームで構成し、各アームは少なくともスイッチング素子の出力端子と整流素子の入力端子とを接続し、前記整流回路の出力電圧が一定化するように、スイッチング素子のオン・オフを制御するように構成してあることを特徴とする。
前記各アームのスイッチング素子の入力端子に抵抗を接続してあることを特徴とする。 The rectifier circuit is composed of two arms, and each arm connects at least the output terminal of the switching element and the input terminal of the rectifier element so that the output voltage of the rectifier circuit is constant. It is configured to control OFF.
A resistor is connected to the input terminal of the switching element of each arm.

本発明によれば、上記構成により、簡単な回路構成で相電流の高調波成分の抑制ができるとともに、各相電流のバランスを保つことができる。また、高効率を得ることができる効果がある。これに加えて、整流回路の入力部にコモンモードチョークコイルを接続したことにより、昇圧チョッパ回路の制御が安定になり、入力歪率（ＴＨＤ）が低く抑えられ、高調波成分電流が基準以下にすることができる効果がある。   According to the present invention, the above configuration can suppress the harmonic component of the phase current with a simple circuit configuration, and can maintain the balance of each phase current. Moreover, there is an effect that high efficiency can be obtained. In addition, by connecting a common mode choke coil to the input of the rectifier circuit, the control of the step-up chopper circuit becomes stable, the input distortion factor (THD) is kept low, and the harmonic component current is below the reference. There is an effect that can be done.

図１は、本発明の最良の実施の形態として、三相３線式交流給電方式のコンバータの一例を示す回路図である。この三相３線式交流給電方式のコンバータは、高調波抑制機能を有した力率改善形コンバータ１，１７，１８を備えてある。三相３線式交流電源各相（Ｕ相、Ｖ相、Ｗ相）間に，これら力率改善形コンバータ１，１７，１８を接続してある。力率改善形コンバータ１，１７，１８の出力は各々ＤＣ／ＤＣコンバータ８，１９，２０の入力に接続されている。各ＤＣ／ＤＣコンバータ８，１９，２０の出力は並列に接続され負荷１６に直流電力を供給する。   FIG. 1 is a circuit diagram showing an example of a three-phase three-wire AC power feeding converter as the best mode of the present invention. This three-phase three-wire AC power supply type converter includes power factor improving converters 1, 17, and 18 having a harmonic suppression function. These power factor improving converters 1, 17 and 18 are connected between each phase (U phase, V phase, W phase) of the three-phase three-wire AC power source. Outputs of the power factor improving converters 1, 17 and 18 are connected to inputs of DC / DC converters 8, 19 and 20, respectively. The outputs of the DC / DC converters 8, 19, and 20 are connected in parallel to supply DC power to the load 16.

力率改善形コンバータ１，１７，１８は各々整流回路２，チョークコイル３，平滑用コンデンサ６，及び制御回路７を備えてある。また、力率改善形コンバータ１，１７，１８の入力部、三相３線式交流電源各相出力部にコモンモードチョークコイルＬ１，Ｌ２，Ｌ３を接続してある。コモンモードチョークコイルＬ１，Ｌ２，Ｌ３と整流回路２との間にチョークコイル３を介してある。整流回路２の出力端に平滑用コンデンサ６が接続してある。   Each of the power factor improving converters 1, 17, and 18 includes a rectifier circuit 2, a choke coil 3, a smoothing capacitor 6, and a control circuit 7. Further, common mode choke coils L1, L2, and L3 are connected to the input portions of the power factor improving converters 1, 17, and 18 and the output portions of the three-phase three-wire AC power supplies. The common mode choke coils L1, L2, L3 and the rectifier circuit 2 are interposed via the choke coil 3. A smoothing capacitor 6 is connected to the output terminal of the rectifier circuit 2.

整流回路２は、２つのアームで構成し、各アームは少なくともスイッチング素子２１，２２の出力端子と整流素子２３，２４の入力端子とを接続してある。また、整流回路２の出力電圧が一定化するように、スイッチング素子２１，２２のオン・オフを制御する制御回路７をスイッチング素子２１，２２の制御端子及び入力端子に接続してある。なお、本実施例においては、スイッチング素子２１，２２はＭＯＳＦＥＴで構成し、ＭＯＳＦＥＴのボディダイオードが整流素子の役割をする。整流素子２３，２４はダイオードで構成してある。また、各アームのスイッチング素子２１，２２のソース端子に抵抗２５，２６を接続してある。なお、制御回路７をスイッチング素子２１，２２のソース端子に接続してあるが、抵抗２５，２６を設けた場合は、制御回路７は抵抗２５，２６とスイッチング素子２１，２２の間に接続することになる。   The rectifier circuit 2 includes two arms, and each arm connects at least the output terminals of the switching elements 21 and 22 and the input terminals of the rectifier elements 23 and 24. Further, a control circuit 7 for controlling on / off of the switching elements 21 and 22 is connected to a control terminal and an input terminal of the switching elements 21 and 22 so that the output voltage of the rectifier circuit 2 is constant. In this embodiment, the switching elements 21 and 22 are constituted by MOSFETs, and the body diode of the MOSFET serves as a rectifying element. The rectifying elements 23 and 24 are constituted by diodes. Resistors 25 and 26 are connected to the source terminals of the switching elements 21 and 22 of each arm. Although the control circuit 7 is connected to the source terminals of the switching elements 21 and 22, when the resistors 25 and 26 are provided, the control circuit 7 is connected between the resistors 25 and 26 and the switching elements 21 and 22. It will be.

ＤＣ／ＤＣコンバータ部８，１９，２０はそれぞれ同時にオン・オフする主スイッチ９，１０、トランス１１、整流ダイオード１２、フライホイールダイオード１３、平滑用チョークコイル１４、平滑用コンデンサ１５で構成されるフォワードコンバータである。このＤＣ／ＤＣコンバータ部８，１９，２０はＤＣ／ＤＣコンバータ部８，１９，２０の主スイッチ９，１０のオン・オフを一括制御する制御回路３０を備えてある。   The DC / DC converter units 8, 19 and 20 are respectively composed of main switches 9 and 10 which are simultaneously turned on and off, a transformer 11, a rectifier diode 12, a flywheel diode 13, a smoothing choke coil 14 and a smoothing capacitor 15. It is a converter. The DC / DC converter units 8, 19, and 20 include a control circuit 30 that collectively controls on / off of the main switches 9 and 10 of the DC / DC converter units 8, 19, and 20.

３個のＤＣ／ＤＣコンバータ８，１９，２０は同一のパルスで駆動されるため，ＤＣ／ＤＣコンバータ８，１９，２０の入力電圧，すなわち力率改善形コンバータ１，１７，１８の出力電圧が一定で，各部品の特性が同じであれば，各ＤＣ／ＤＣコンバータ８，１９，２０の電流はバランスし，これらの入力電源である力率改善形コンバータ１，１７，１８の電流もバランスする。   Since the three DC / DC converters 8, 19, and 20 are driven with the same pulse, the input voltage of the DC / DC converters 8, 19, and 20, that is, the output voltages of the power factor improving converters 1, 17, and 18 are If the characteristics of each component are the same, the currents of the DC / DC converters 8, 19, and 20 are balanced, and the currents of the power factor improving converters 1, 17, and 18 that are the input power sources are also balanced. .

本実施例における三相３線式交流給電方式のコンバータは、以上のような構成を有し、以下のような作用をする。先ず、力率改善形コンバータ１，１７，１８の作用について説明する。図１の実施例において、三相３線式交流電源各相出力部にコモンモードチョークコイルＬ１，Ｌ２，Ｌ３を接続してある。コモンモードチョークコイルＬ１，Ｌ２，Ｌ３が無い場合は、Ｖ相を基準にした場合、ある時間経過においてＵ相からＶ相へ供給する供給電流ＩＵ−ＶとＷ相からＶ相へ供給する供給電流ＩＷ−Ｖとがあるが、互いの供給電流により、力率改善形コンバータ１７に有するチョークコイル３のインダクタンスの電位分差が発生して、安定電位を変動させることがあるが、本実施例においては、三相３線式交流電源各相出力部にコモンモードチョークコイルＬ１，Ｌ２，Ｌ３を接続してあることにより、安定電位を変動させる原因であるコモンモードノイズをコモンモードチョークコイルＬ１，Ｌ２，Ｌ３で抑制することで、力率改善形コンバータ１７に有する平滑用チョークコイルのインダクタンスの電位分差が発生して、安定電位を変動させることを抑制することができる。これにより、図２に示すように入力電流波形が平滑になる。 The converter of the three-phase three-wire AC power feeding system in the present embodiment has the above configuration and operates as follows. First, the operation of the power factor improving converters 1, 17 and 18 will be described. In the embodiment of FIG. 1, common mode choke coils L1, L2, and L3 are connected to the respective phase output portions of the three-phase three-wire AC power supply. When there is no common mode choke coil L1, L2, L3, supply current IU-V supplied from the U phase to the V phase and a supply supplied from the W phase to the V phase after a certain time when the V phase is used as a reference. Although there is a current IW-V , a potential difference of the inductance of the choke coil 3 included in the power factor improving converter 17 may be generated due to the mutual supply currents, and the stable potential may be changed. In the example, the common mode choke coils L1, L2, and L3 are connected to the output portions of the three-phase three-wire AC power supply so that the common mode noise that causes the stable potential to fluctuate is detected. , L2, and L3, the potential difference of the inductance of the smoothing choke coil included in the power factor improving converter 17 is generated and the stable potential is changed. It is possible to suppress the Rukoto. As a result, the input current waveform becomes smooth as shown in FIG.

続いて、上から下に流れる向きをプラスとすると、力率改善形コンバータ１を構成する抵抗２５，２６の電流は、プラス側ではスイッチングされているが、マイナス側では連続となっている。これは電流がプラス側の場合はスイッチ素子２１，２２のオン・オフによって電流が流れるか流れないかが決まるが、電流がマイナス側の場合スイッチ素子２１，２２のオンオフによらず、それと直列の整流素子２３，２４を通過して流れる為である。図１図示実施例の場合は、スイッチ素子２１，２２がＭＯＳＦＥＴなので、そのボディダイオードを通過して電流が流れる為、連続となる。   Subsequently, assuming that the direction flowing from the top to the bottom is positive, the currents of the resistors 25 and 26 constituting the power factor improving converter 1 are switched on the positive side, but are continuous on the negative side. When the current is on the positive side, whether the current flows or not depends on whether the switch elements 21 and 22 are turned on or off. This is because it flows through the elements 23 and 24. In the case of the embodiment shown in FIG. 1, since the switch elements 21 and 22 are MOSFETs, a current flows through the body diode, so that the switch elements 21 and 22 are continuous.

実際には各部品の特性はばらついているが，力率改善形コンバータの出力電圧は出力電流に対してマイナスの変動特性を持っているため，電流が増加するとＤＣ／ＤＣコンバータの入力電圧が下がり電流を減らす作用をするためバランスを保つように作用する。このように，この方式によれば非常に簡単な回路で各相の入力の高調波電流の抑制と電流バランスを満足させることができる。コモンモードチョークコイルＬ１，Ｌ２，Ｌ３を設けたことにより、これらを有しない図４図示従来例と比べて、効率は下がるが、図３図示従来例に比べれば効率は良く、また、図４図示従来例に比べて格段と高調波成分を抑制することができるので、従来例に比べて、各相電流バランスが良い。   Actually, the characteristics of each component vary, but the output voltage of the power factor improving converter has a negative fluctuation characteristic with respect to the output current. Therefore, when the current increases, the input voltage of the DC / DC converter decreases. It works to keep balance to reduce current. Thus, according to this method, it is possible to satisfy the harmonic current suppression and current balance of each phase input with a very simple circuit. By providing the common mode choke coils L1, L2, and L3, the efficiency is lower than that of the conventional example shown in FIG. 4 that does not have these, but the efficiency is better than that of the conventional example shown in FIG. Since the harmonic components can be significantly suppressed as compared with the conventional example, each phase current balance is better than that of the conventional example.

本発明に係る三相力率改善形コンバータの実施例を示す回路図である。It is a circuit diagram which shows the Example of the three-phase power factor improvement type | mold converter which concerns on this invention. 図１図示実施例における入力電流波形図である。1 is an input current waveform diagram in the embodiment shown in FIG. 従来の三相力率改善形コンバータの例を示す回路図である。It is a circuit diagram which shows the example of the conventional three-phase power factor improvement type | mold converter. 図３図示従来例における入力電流波形図である。FIG. 4 is an input current waveform diagram in the conventional example shown in FIG. 3.

符号の説明Explanation of symbols

１，１７，１８ 力率改善形コンバータ
２ 整流回路
３ チョークコイル
６ 平滑用コンデンサ
７ 制御回路
８，１９，２０ ＤＣ／ＤＣコンバータ
９，１０ 主スイッチ
１１ トランス１１
１２ 整流ダイオード
１３ フライホイールダイオード
１４ 平滑用チョークコイル
１５ 平滑用コンデンサ
１６ 負荷
２１，２２ スイッチング素子
２３，２４ 整流素子
２５，２６ 抵抗
３０ 制御回路
Ｌ１，Ｌ２，Ｌ３ コモンモードチョークコイル 1, 17, 18 Power factor improving converter 2 Rectifier circuit 3 Choke coil 6 Smoothing capacitor 7 Control circuits 8, 19, 20 DC / DC converters 9, 10 Main switch 11 Transformer 11
12 Rectifier diode 13 Flywheel diode 14 Smoothing choke coil 15 Smoothing capacitor 16 Loads 21, 22 Switching elements 23, 24 Rectifier elements 25, 26 Resistor 30 Control circuit L1, L2, L3 Common mode choke coil

Claims (3)

三相３線式交流電源各相間に，高調波抑制機能を有した力率改善形コンバータ３組を接続した三相力率改善形コンバータにおいて，
前記力率改善形コンバータの各相入力部にコモンモードチョークコイルを接続し、このコモンモードチョークコイルの出力にはチョークコイルを介して整流回路を接続し、前記力率改善形コンバータの出力にＤＣ／ＤＣコンバータを接続し，前記ＤＣ／ＤＣコンバータの各出力を並列接続し，かつ前記ＤＣ／ＤＣコンバータを共通の出力電圧検出誤差信号により制御する制御回路を有することを特徴とする三相力率改善形コンバータ。 In the three-phase power factor correction type converter in which three sets of power factor improvement type converters with harmonic suppression function are connected between each phase of the three-phase three-wire AC power supply,
A common mode choke coil is connected to each phase input portion of the power factor improving converter, a rectifier circuit is connected to the output of the common mode choke coil via the choke coil, and a DC is connected to the output of the power factor improving converter. A three-phase power factor comprising: a DC / DC converter, a parallel connection of the outputs of the DC / DC converter, and control of the DC / DC converter by a common output voltage detection error signal Improved converter. 前記整流回路は、２つのアームで構成し、各アームは少なくともスイッチング素子の出力端子と整流素子の入力端子とを接続し、前記整流回路の出力電圧が一定化するように、スイッチング素子のオン・オフを制御するように構成してあることを特徴とする請求項１記載の三相力率改善形コンバータ。 The rectifier circuit is composed of two arms, and each arm connects at least the output terminal of the switching element and the input terminal of the rectifier element, so that the output voltage of the rectifier circuit becomes constant. 2. The three-phase power factor improving converter according to claim 1, wherein the converter is configured to control OFF. 前記各アームのスイッチング素子の入力端子に抵抗を接続してあることを特徴とする請求項２記載の三相力率改善形コンバータ。 3. The three-phase power factor improving converter according to claim 2, wherein a resistor is connected to an input terminal of the switching element of each arm.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013099918A1 (en) * 2011-12-27 2013-07-04 株式会社村田製作所 Switching power supply device and ac-dc power conversion system
CN112070396A (en) * 2020-09-08 2020-12-11 国网河北省电力有限公司石家庄供电分公司 Visualization-based regional power supply risk assessment system and method

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JP2003018853A (en) * 2001-06-28 2003-01-17 Fuji Electric Co Ltd Common mode current reduction method
JP2003333855A (en) * 2002-05-10 2003-11-21 Shindengen Electric Mfg Co Ltd Current detection circuit

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Publication number Priority date Publication date Assignee Title
JPH10271823A (en) * 1997-03-21 1998-10-09 Shindengen Electric Mfg Co Ltd Power factor improved three-phase converter
JP2003018853A (en) * 2001-06-28 2003-01-17 Fuji Electric Co Ltd Common mode current reduction method
JP2003333855A (en) * 2002-05-10 2003-11-21 Shindengen Electric Mfg Co Ltd Current detection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013099918A1 (en) * 2011-12-27 2013-07-04 株式会社村田製作所 Switching power supply device and ac-dc power conversion system
CN112070396A (en) * 2020-09-08 2020-12-11 国网河北省电力有限公司石家庄供电分公司 Visualization-based regional power supply risk assessment system and method
CN112070396B (en) * 2020-09-08 2024-04-09 国网河北省电力有限公司石家庄供电分公司 Regional power supply risk assessment system and method based on visualization

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