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JP2006325353A - Three-phase rectifier instrument - Google Patents

Three-phase rectifier instrument Download PDF

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JP2006325353A
JP2006325353A JP2005147575A JP2005147575A JP2006325353A JP 2006325353 A JP2006325353 A JP 2006325353A JP 2005147575 A JP2005147575 A JP 2005147575A JP 2005147575 A JP2005147575 A JP 2005147575A JP 2006325353 A JP2006325353 A JP 2006325353A
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phase rectifier
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Junpei Hayakawa
純平 早川
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Shindengen Electric Manufacturing Co Ltd
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Shindengen Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase rectifier instrument wherein a difference in input current between phases can be reduced even if a large current is made to flow. <P>SOLUTION: The three-phase rectifier instrument is constructed of multiple single-phase rectifier units R, S, T and U. The rectifier instrument has an imbalanced single-phase rectifier unit U. Three phases r, s and t are star-connected, and the single-phase rectifier units R, S and T are connected to the respective phases r, s and t so that balance is obtained. The imbalanced single-phase rectifier unit U is connected between a first phase r and a second phase s. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、非対称性を有する三相交流方式における三相整流装置に関する。   The present invention relates to a three-phase rectifier in a three-phase AC system having asymmetry.

三相交流方式における三相整流装置は、図５に示すように、入力をデルタ結線で構成したものや、図６に示すように、スター結線で構成したものがある。それぞれ三つの相ｒ，ｓ，ｔ，ｕ，ｖ，ｗに単相整流器ユニットＲ，Ｓ，Ｔ，Ｕ，Ｖ，Ｗを接続していた。   As shown in FIG. 5, three-phase rectifiers in the three-phase alternating current system include those in which the input is configured by delta connection, and those in which the input is configured by star connection as shown in FIG. Single phase rectifier units R, S, T, U, V, and W were connected to three phases r, s, t, u, v, and w, respectively.

さらに各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕ，Ｖ，Ｗの出力を並列に接続して高出力を出力し、各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕ，Ｖ，Ｗの負荷を均等負荷となるようにして、入力電流を平衡状態としていた。（例えば、非特許文献１参照）。
高木亀一著「基礎電気電子回路」オーム社、平成１３年３月２０日出版、ｐ９７−１００ Furthermore, the output of each single-phase rectifier unit R, S, T, U, V, W is connected in parallel to output a high output, and the load of each single-phase rectifier unit R, S, T, U, V, W is The input current was balanced so that the load was equal. (For example, refer nonpatent literature 1).
Kaichi Takagi, “Basic Electrical and Electronic Circuits” Ohmsha, published on March 20, 2001, p. 97-100

また、四つ以上の単相整流器ユニットを設けた場合、図７に示すように、入力をデルタ結線で構成し、それぞれ三つの相ｕ，ｖ，ｗに単相整流器ユニットＵ，Ｖ，Ｗを接続し、四つ目以降の単相整流器ユニットＵ２，Ｖ２を、三つの相ｕ，ｖ，ｗのいずれかに、且つ単相整流器ユニットＵ１，Ｖ１，Ｗのいずれかと並列に接続することが考えられた。   Further, when four or more single-phase rectifier units are provided, as shown in FIG. 7, the input is configured by delta connection, and single-phase rectifier units U, V, and W are provided for three phases u, v, and w, respectively. It is considered that the fourth and subsequent single-phase rectifier units U2 and V2 are connected in parallel to any one of the three phases u, v, and w and to any one of the single-phase rectifier units U1, V1, and W. It was.

図５に示すように、各相ｕ，ｖ，ｗに同数の単相整流器ユニットＵ，Ｖ，Ｗを設けてある場合は、平衡状態にあるため、各相における入力電流Ｉｒ，Ｉｓ，Ｉｔの差がほとんど無い状態にあるが、図７で示すように、不均衡な単相整流器ユニットＵ２，Ｖ２を有する場合、図８で示すように、入力電流Ｉｒ，Ｉｓ，Ｉｔの差は単相整流器ユニットＵ，Ｖ，Ｗの台数によって大きく異なる。そのため、各相ｕ，ｖ，ｗに同数の単相整流器ユニットＵ，Ｖ，Ｗを設けるか、単相整流器ユニットＵ，Ｖ，Ｗの総台数を１０台以上設けて高出力にしなければ、入力電流の差を小さくすることができないという課題があった。   As shown in FIG. 5, when the same number of single-phase rectifier units U, V, and W are provided for each phase u, v, and w, they are in an equilibrium state, so that the input currents Ir, Is, and It in each phase When there is an unbalanced single-phase rectifier unit U2 and V2 as shown in FIG. 7, the difference between the input currents Ir, Is and It is a single-phase rectifier as shown in FIG. It varies greatly depending on the number of units U, V, and W. Therefore, if the same number of single-phase rectifier units U, V, W are provided for each phase u, v, w, or if the total number of single-phase rectifier units U, V, W is not less than 10 and high output is required There was a problem that the difference in current could not be reduced.

本発明は、上記問題に鑑みてなされたものであり、大電流を流しても、各相間の入力電流の差を小さくすることが可能な三相整流装置を提供する。   The present invention has been made in view of the above problems, and provides a three-phase rectifier capable of reducing a difference in input current between phases even when a large current is passed.

本発明に係る三相整流装置は、複数台の単相整流器ユニットで構成されている三相整流装置において、不均衡な単相整流器ユニットを一台有し、三つの相の各相をスター結線で接続し、それぞれの相に単相整流器ユニットを平衡になるように接続し、不均衡な単相整流器ユニットを、第一の相と第二の相との間に接続してあることを特徴とする。   The three-phase rectifier according to the present invention is a three-phase rectifier constituted by a plurality of single-phase rectifier units, and has one unbalanced single-phase rectifier unit, and star-connected each of the three phases. And a single-phase rectifier unit is connected to each phase in a balanced manner, and an unbalanced single-phase rectifier unit is connected between the first phase and the second phase. And

また、本発明に係る三相整流装置は、複数台の単相整流器ユニットで構成されている三相整流装置において、不均衡な単相整流器ユニットを二台有し、三つの相の各相をスター結線で接続し、それぞれの相に単相整流器ユニットを平衡になるように接続し、一の不均衡な単相整流器ユニットを第一の相と第二の相との間に接続に、他の不均衡な単相整流器ユニットを第二の相と第三の相との間にそれぞれ接続してあることを特徴とする。
さらに、前記二つの不均衡な単相整流器ユニットが両方とも接続されていない相における前記単相整流器ユニットの入力電圧を、装置の入力電流を平衡状態になるように下げるように制御する構成を有することを特徴とする。 Further, the three-phase rectifier according to the present invention is a three-phase rectifier constituted by a plurality of single-phase rectifier units, and has two unbalanced single-phase rectifier units, and each phase of the three phases is Connect with a star connection, connect a single-phase rectifier unit to each phase in a balanced manner, connect one unbalanced single-phase rectifier unit between the first phase and the second phase, the other The unbalanced single-phase rectifier unit is connected between the second phase and the third phase, respectively.
Furthermore, the input voltage of the single-phase rectifier unit in a phase where both of the two unbalanced single-phase rectifier units are not connected is controlled to lower the input current of the device so as to be in a balanced state. It is characterized by that.

本発明によれば、各相間に接続した単相整流器ユニットの電圧は、単にスター結線で構成した三つの相の各相に、それぞれ単相整流器ユニットを接続した状態と比べて√３倍となり、相間に接続したユニットの電流は１／√３倍となり、各相における入力電流の差が小さくなるという効果がある。   According to the present invention, the voltage of the single-phase rectifier unit connected between the phases is √3 times as compared with the state in which the single-phase rectifier unit is connected to each of the three phases simply constituted by star connection, The current of the units connected between the phases is 1 / √3 times, and there is an effect that the difference in input current in each phase is reduced.

発明を実施するための最良の形態を図１の回路に基づいて説明する。本実施形態に係る三相整流装置は、四台の単相整流器ユニットＳ，Ｒ，Ｔ，Ｕで構成されている。即ち、不均衡な単相整流器ユニットＵを一台有する。   The best mode for carrying out the invention will be described with reference to the circuit of FIG. The three-phase rectifier according to the present embodiment includes four single-phase rectifier units S, R, T, and U. That is, it has one unbalanced single-phase rectifier unit U.

この三相整流装置は三つの相ｒ，s，ｔを有し、この三つの相ｒ，s，ｔの各相をスター結線で接続してある。スター結線で接続したそれぞれの相ｒ，ｓ，ｔに単相整流器ユニットＲ，Ｓ，Ｔを平衡になるように接続してある。また、不均衡な単相整流器ユニットＵを、ｒ相とｓ相との間に接続してある。   This three-phase rectifier has three phases r, s and t, and the three phases r, s and t are connected by star connection. Single-phase rectifier units R, S, T are connected to each phase r, s, t connected by star connection so as to be balanced. An unbalanced single-phase rectifier unit U is connected between the r-phase and the s-phase.

単相整流器ユニットＳ，Ｒ，Ｔ，Ｕの一例を図２に示す。単相整流器ユニット１は、力率改善回路２、及び、ＤＣ／ＤＣコンバータ３を備えてある。交流入力電源を力率改善回路２に接続し、力率改善回路２の出力をＤＣ／ＤＣコンバータ３の入力に接続してある。また、単相整流器ユニット１には、力率改善回路制御部４を備え、力率改善回路２の出力信号と入力信号を入力し、力率改善回路２に備えたスイッチ５に制御信号を出力するよう構成してある。   An example of the single phase rectifier units S, R, T, U is shown in FIG. The single-phase rectifier unit 1 includes a power factor correction circuit 2 and a DC / DC converter 3. An AC input power source is connected to the power factor correction circuit 2, and the output of the power factor improvement circuit 2 is connected to the input of the DC / DC converter 3. In addition, the single-phase rectifier unit 1 includes a power factor correction circuit control unit 4, which receives an output signal and an input signal of the power factor correction circuit 2 and outputs a control signal to a switch 5 provided in the power factor correction circuit 2. It is configured to do.

続いて、動作について説明する。先ず、スター結線で接続したそれぞれの相ｒ，ｓ，ｔに単相整流器ユニットＲ，Ｓ，Ｔを設けた場合、単相整流器ユニットＲ，Ｓ，Ｔに流れる電流Ｉｒ，Ｉｓ，Ｉｔは、三つの相に流れる電流ＩＲ，ＩＳ，ＩＴと等しくなる。即ち、ＩＲ＝ＩＳ＝ＩＴ＝Ｉｒ＝Ｉｓ＝Ｉｔとなる。   Subsequently, the operation will be described. First, when the single-phase rectifier units R, S, and T are provided in the respective phases r, s, and t connected by the star connection, the currents Ir, Is, and It flowing through the single-phase rectifier units R, S, and T are three. It becomes equal to the currents IR, IS, IT flowing in one phase. That is, IR = IS = IT = Ir = Is = It.

本実施形態においては、不均衡な単相整流器ユニットＵを、ｒ相とｓ相との間に接続してある。そのため、不均衡な単相整流器ユニットＵの電圧Ｖｕは、単相整流器ユニットＲ，Ｓ，Ｔの電圧の√３倍となり、各単相整流ユニットＲ，Ｓ，Ｔ，Ｕの電力は等しいため、単相整流ユニットＵに流れる電流Ｉｕは、単相整流器ユニットＲ，Ｓ，Ｔに流れる電流の１／√３倍、即ち、Ｉｕ＝１／√３Ｉｒとなる。   In the present embodiment, an unbalanced single-phase rectifier unit U is connected between the r-phase and the s-phase. Therefore, the voltage Vu of the unbalanced single-phase rectifier unit U is √3 times the voltage of the single-phase rectifier units R, S, T, and the power of each single-phase rectifier unit R, S, T, U is equal. The current Iu flowing through the single-phase rectifier unit U is 1 / √3 times the current flowing through the single-phase rectifier units R, S, T, that is, Iu = 1 / √3Ir.

ｒ相に流れる電流ＩＲは、ＩＲ＝Ｉｕ＋Ｉｒとなる。即ち、ｒ相に流れる電流ＩＲと単相整流器ユニットＲに流れる電流Ｉｒとの関係は、ＩＲ＝（（√３＋３）／３）・Ｉｒとなり、ｒ相に流れる電流ＩＲは、単相整流器ユニットＲに流れる電流Ｉｒの約１．５７倍になる。ｓ相に流れる電流も、単相整流器ユニットＳに流れる電流Ｉｓの約１．５７倍になる。   The current IR flowing in the r phase is IR = Iu + Ir. That is, the relationship between the current IR flowing in the r-phase and the current Ir flowing in the single-phase rectifier unit R is IR = ((√3 + 3) / 3) · Ir, and the current IR flowing in the r-phase is equal to the single-phase rectifier unit R About 1.57 times the current Ir flowing through The current flowing in the s phase is also about 1.57 times the current Is flowing in the single-phase rectifier unit S.

さらに、単相整流器ユニットＵが接続されていない相におけるスター接続の単相整流器ユニットＴの電圧をわずかに下げることによって、各単相整流器ユニットＲ，Ｓ，Ｔの負荷を均等にする。これについては、図４に示すフローチャートを用いて説明する。   Further, by slightly reducing the voltage of the star-connected single-phase rectifier unit T in the phase to which the single-phase rectifier unit U is not connected, the loads of the single-phase rectifier units R, S, T are equalized. This will be described with reference to the flowchart shown in FIG.

先ず、各単相整流器ユニットＲ，Ｓ，Ｔに設けた力率改善回路２の出力電圧を検出し、この検出信号を力率改善回路制御部４に出力する。これを基準電圧信号と比較し、比較して現れた力率改善回路出力電圧誤差信号を出力する。   First, the output voltage of the power factor correction circuit 2 provided in each single-phase rectifier unit R, S, T is detected, and this detection signal is output to the power factor correction circuit control unit 4. This is compared with the reference voltage signal, and a power factor correction circuit output voltage error signal appearing in comparison is output.

一方、三相整流装置入力電流制御部１０では、三つの相ｕ，ｖ，ｗの入力電圧Ｖｕ，Ｖｖ，Ｖｗ及び三つの相ｒ，ｓ，ｔの入力電流ＩＲ，ＩＳ，ＩＴを入力し、これらを基に入力電圧・電流制御信号を作成処理する。入力電圧・電流制御信号は各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕに出力する。   On the other hand, the three-phase rectifier input current control unit 10 inputs the input voltages Vu, Vv, Vw of the three phases u, v, w and the input currents IR, IS, IT of the three phases r, s, t, Based on these, an input voltage / current control signal is created and processed. The input voltage / current control signal is output to each single-phase rectifier unit R, S, T, U.

各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕの力率改善回路制御部４において作成された力率改善回路出力電圧誤差信号に三相整流装置入力電流制御部１０で作成した入力電圧・電流制御信号とを合成してスイッチング信号を作成し、力率改善回路２に備えたスイッチ５に制御信号を出力する。この制御信号により、単相整流器ユニットＵが接続されていない相におけるスター接続のユニットＴの電圧をわずかに下げることができ、図５に示すように、各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕの負荷を均等にすることができる。このことから、このユニットの入力電流を増加（他は減少）することができ、さらに装置の入力電流を平衡状態に近づけられる。以上より、図１０に示す従来の場合と比較しても各相における入力電流の差は小さくなることが明らかである。   Input voltage / current control created by the three-phase rectifier input current control unit 10 to the power factor improvement circuit output voltage error signal created by the power factor improvement circuit control unit 4 of each single-phase rectifier unit R, S, T, U A switching signal is created by combining the signal and a control signal is output to the switch 5 provided in the power factor correction circuit 2. With this control signal, the voltage of the star-connected unit T in the phase where the single-phase rectifier unit U is not connected can be slightly lowered, and as shown in FIG. 5, each single-phase rectifier unit R, S, T, U load can be equalized. This makes it possible to increase (decrease others) the input current of this unit and to bring the input current of the device closer to equilibrium. From the above, it is clear that the difference between the input currents in the respective phases is smaller than in the conventional case shown in FIG.

本発明に係る実施形態の変形例の回路図を図３に示し、この変形例を図３の回路に基づいて説明する。本実施例に係る三相整流装置は、五台の単相整流器ユニットＳ，Ｒ，Ｔ，Ｕ，Ｖで構成されている。即ち、不均衡な単相整流器ユニットＵ，Ｖを二台有する。   A circuit diagram of a modification of the embodiment according to the present invention is shown in FIG. 3, and this modification will be described based on the circuit of FIG. The three-phase rectifier according to the present embodiment includes five single-phase rectifier units S, R, T, U, and V. That is, it has two unbalanced single-phase rectifier units U and V.

この三相整流装置は三つの相ｒ，s，ｔを有し、この三つの相ｒ，s，ｔの各相をスター結線で接続してある。スター結線で接続したそれぞれの相ｒ，ｓ，ｔに単相整流器ユニットＳ，Ｒ，Ｔを平衡になるように接続してある。また、不均衡な単相整流器ユニットＵを、ｒ相とｓ相との間に接続してある。さらに、本実施例では、もう一つの不均衡な単相整流器ユニットＶを、ｓ相とｔ相との間に接続してある。   This three-phase rectifier has three phases r, s and t, and the three phases r, s and t are connected by star connection. Single-phase rectifier units S, R, and T are connected to each phase r, s, and t connected by star connection so as to be balanced. An unbalanced single-phase rectifier unit U is connected between the r-phase and the s-phase. Furthermore, in this embodiment, another unbalanced single-phase rectifier unit V is connected between the s phase and the t phase.

続いて、動作について説明する。先ず、本実施例においては、不均衡な単相整流器ユニットＵを、ｒ相とｓ相との間に接続してある。そのため、不均衡な単相整流器ユニットＵの電圧Ｖｕは、単相整流器ユニットＲ，Ｓ，Ｔの電圧の√３倍となり、各単相整流ユニットＲ，Ｓ，Ｔ，Ｕの電力は等しいため、単相整流ユニットＵに流れる電流Ｉｕは、単相整流器ユニットＲ，Ｓ，Ｔに流れる電流の１／√３倍、即ち、Ｉｕ＝１／√３Ｉｒとなる。   Subsequently, the operation will be described. First, in this embodiment, an unbalanced single-phase rectifier unit U is connected between the r-phase and the s-phase. Therefore, the voltage Vu of the unbalanced single-phase rectifier unit U is √3 times the voltage of the single-phase rectifier units R, S, T, and the power of each single-phase rectifier unit R, S, T, U is equal. The current Iu flowing through the single-phase rectifier unit U is 1 / √3 times the current flowing through the single-phase rectifier units R, S, T, that is, Iu = 1 / √3Ir.

ｒ相に流れる電流ＩＲは、ＩＲ＝Ｉｕ＋Ｉｒとなる。即ち、ｒ相に流れる電流ＩＲと単相整流器ユニットＲに流れる電流Ｉｒとの関係は、ＩＲ＝（（√３＋３）／３）・Ｉｒとなり、ｒ相に流れる電流ＩＲは、単相整流器ユニットＲに流れる電流Ｉｒの約１．５７倍になる。   The current IR flowing in the r phase is IR = Iu + Ir. That is, the relationship between the current IR flowing in the r-phase and the current Ir flowing in the single-phase rectifier unit R is IR = ((√3 + 3) / 3) · Ir, and the current IR flowing in the r-phase is equal to the single-phase rectifier unit R About 1.57 times the current Ir flowing through

本実施例では、不均衡な単相整流器ユニットＶを、ｓ相とｔ相との間に接続してある。そのため、不均衡な単相整流器ユニットＶの電圧Ｖｖは、単相整流器ユニットＲ，Ｓ，Ｔの電圧の√３倍となり、各単相整流ユニットＲ，Ｓ，Ｔ，Ｖの電力は等しいため、単相整流ユニットＶに流れる電流Ｉｖは、単相整流器ユニットＲ，Ｓ，Ｔに流れる電流の１／√３倍、即ち、Ｉｖ＝１／√３Ｉｓとなる。   In this embodiment, an unbalanced single-phase rectifier unit V is connected between the s phase and the t phase. Therefore, the voltage Vv of the unbalanced single-phase rectifier unit V is √3 times the voltage of the single-phase rectifier units R, S, T, and the power of each single-phase rectifier unit R, S, T, V is equal. The current Iv flowing through the single-phase rectifier unit V is 1 / √3 times the current flowing through the single-phase rectifier units R, S, T, that is, Iv = 1 / √3Is.

ｓ相に流れる電流ＩＳは、ＩＳ＝Ｉｕ＋Ｉｓ＋Ｉｖとなる。即ち、ｓ相に流れる電流ＩＳと単相整流器ユニットＲに流れる電流Ｉｓとの関係は、ＩＲ＝（（２√３＋３）／３）・Ｉｒとなり、ｒ相に流れる電流ＩＲは、単相整流器ユニットＲに流れる電流Ｉｒの約２．４８倍になる。ｔ相に流れる電流ＩＴは、ｒ相に流れる電流ＩＲとほぼ同様、即ち、ｔ相に流れる電流ＩＴは、単相整流器ユニットＴに流れる電流ＩＴの約１．５７倍になる。これから、電流ＩＳは電流ＩＲ、ＩＴと比べ、２．４８／１．５７＝１．５７倍となる。   The current IS flowing in the s phase is IS = Iu + Is + Iv. That is, the relationship between the current IS flowing in the s phase and the current Is flowing in the single phase rectifier unit R is IR = ((2√3 + 3) / 3) · Ir, and the current IR flowing in the r phase is This is about 2.48 times the current Ir flowing through R. The current IT flowing in the t phase is substantially the same as the current IR flowing in the r phase, that is, the current IT flowing in the t phase is about 1.57 times the current IT flowing in the single-phase rectifier unit T. From this, the current IS is 2.48 / 1.57 = 1.57 times the currents IR and IT.

さらに、単相整流器ユニットＵ、Ｖが両方とも接続されていない相におけるスター接続のユニットＲ、Ｔの電圧をわずかに下げることによって、各単相整流器ユニットＲ，Ｓ，Ｔの負荷を均等にする。これについては、図４に示すフローチャートを用いて説明する。   Further, the load of each single-phase rectifier unit R, S, T is made equal by slightly lowering the voltage of the star-connected units R, T in the phase where both the single-phase rectifier units U, V are not connected. . This will be described with reference to the flowchart shown in FIG.

先ず、各単相整流器ユニットＲ，Ｓ，Ｔに設けた力率改善回路２の出力電圧を検出し、この検出信号を力率改善回路制御部４に出力する。これを基準電圧信号と比較し、比較して現れた力率改善回路出力電圧誤差信号を出力する。   First, the output voltage of the power factor correction circuit 2 provided in each single-phase rectifier unit R, S, T is detected, and this detection signal is output to the power factor correction circuit control unit 4. This is compared with the reference voltage signal, and a power factor correction circuit output voltage error signal appearing in comparison is output.

一方、三相整流装置入力電流制御部１０では、三つの相ｕ，ｖ，ｗの入力電圧Ｖｕ，Ｖｖ，Ｖｗ及び三つの相ｒ，ｓ，ｔの入力電流ＩＲ，ＩＳ，ＩＴを入力し、これらを基に入力電圧・電流制御信号を作成処理する。入力電圧・電流制御信号は各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕ，Ｖに出力する。   On the other hand, the three-phase rectifier input current control unit 10 inputs the input voltages Vu, Vv, Vw of the three phases u, v, w and the input currents IR, IS, IT of the three phases r, s, t, Based on these, an input voltage / current control signal is created and processed. The input voltage / current control signal is output to each single-phase rectifier unit R, S, T, U, V.

各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕ，Ｖの力率改善回路制御部４において作成された力率改善回路出力電圧誤差信号に三相整流装置入力電流制御部１０で作成した入力電圧・電流制御信号とを合成してスイッチング信号を作成し、力率改善回路２に備えたスイッチ５に制御信号を出力する。この制御信号により、単相整流器ユニットＵ、Ｖが両方とも接続されていない相におけるスター接続のユニットＲ、Ｔの電圧をわずかに下げることができ、図５に示すように、各単相整流器ユニットＲ，Ｓ，Ｔ，Ｕの負荷を均等にすることができる。このことから、このユニットの入力電流を増加（他は減少）することができ、さらに装置の入力電流を平衡状態に近づけられる。   The power voltage correction circuit output voltage error signal generated in the power factor correction circuit control unit 4 of each single-phase rectifier unit R, S, T, U, V is applied to the input voltage / voltage generated by the three-phase rectifier input current control unit 10. A switching signal is created by combining the current control signal and the control signal is output to the switch 5 provided in the power factor correction circuit 2. With this control signal, the voltage of the star-connected units R and T in the phase where both of the single-phase rectifier units U and V are not connected can be slightly lowered. As shown in FIG. The load of R, S, T, U can be made equal. This makes it possible to increase (decrease others) the input current of this unit and to bring the input current of the device closer to equilibrium.

なお、本発明は前記実施例に限定されるものではなく、特許請求の範囲に記載されている内容が本発明の技術的範囲に属する。
In addition, this invention is not limited to the said Example, The content as described in the claim belongs to the technical scope of this invention.

本発明によれば、各相間に接続した単相整流器ユニットの電圧は、単にスター結線で構構成した三つの相の各相に、それぞれ単相整流器ユニットを接続した状態と比べて√３倍となり、相間に接続したユニットの電流は１／√３倍となり、各相における入力電流の差が小さくなる。   According to the present invention, the voltage of the single-phase rectifier unit connected between the phases is √3 times as compared with the state in which the single-phase rectifier unit is connected to each of the three phases configured simply by star connection. The current of the units connected between the phases becomes 1 / √3 times, and the difference in the input current in each phase becomes small.

本発明を実施するための最良の形態における回路図を示す。The circuit diagram in the best form for implementing this invention is shown. 本発明の要部の実施例の回路図を示す。The circuit diagram of the Example of the principal part of this invention is shown. 本発明に係る実施形態の変形例の回路図を示す。The circuit diagram of the modification of embodiment which concerns on this invention is shown. 本発明に係る制御部におけるフローチャートを示す。The flowchart in the control part which concerns on this invention is shown. 本発明に係る総単相整流器ユニットと入力線電流との関係を表す表を示す。The table showing the relationship between the total single phase rectifier unit and the input line current according to the present invention is shown. 従来の三相整流回路の例を示す。An example of a conventional three-phase rectifier circuit is shown. 同じく従来の三相整流回路の例を示す。Similarly, an example of a conventional three-phase rectifier circuit is shown. 同じく従来の三相整流回路の例を示す。Similarly, an example of a conventional three-phase rectifier circuit is shown. 従来例に係る総単相整流器ユニットと入力線電流との関係を表す表を示す。The table showing the relationship between the total single phase rectifier unit which concerns on a prior art example, and input line current is shown.

符号の説明Explanation of symbols

１ 単相整流器ユニット
２ 力率改善回路
３ ＤＣ／ＤＣコンバータ
４ 力率改善回路制御部
１０ 三相整流装置入力電流制御部
ｒ，ｓ，ｔ，ｕ，ｖ，ｗ 相
Ｒ，Ｓ，Ｔ，Ｕ，Ｕ１，Ｕ２，Ｖ，Ｖ１，Ｖ２，Ｗ 単相整流器ユニット
DESCRIPTION OF SYMBOLS 1 Single phase rectifier unit 2 Power factor improvement circuit 3 DC / DC converter 4 Power factor improvement circuit control part 10 Three-phase rectifier input current control part r, s, t, u, v, w Phase R, S, T, U , U1, U2, V, V1, V2, W Single-phase rectifier unit

Claims (3)

複数台の単相整流器ユニットで構成されている三相整流装置において、不均衡な単相整流器ユニットを一台有し、三つの相の各相をスター結線で接続し、それぞれの相に単相整流器ユニットを平衡になるように接続し、不均衡な単相整流器ユニットを、第一の相と第二の相との間に接続してあることを特徴とする三相整流装置。 In a three-phase rectifier unit composed of multiple single-phase rectifier units, it has one unbalanced single-phase rectifier unit, and each of the three phases is connected by star connection, and each phase is a single-phase A three-phase rectifier comprising: a rectifier unit connected in a balanced manner; and an unbalanced single-phase rectifier unit connected between a first phase and a second phase. 複数台の単相整流器ユニットで構成されている三相整流装置において、不均衡な単相整流器ユニットを二台有し、三つの相の各相をスター結線で接続し、それぞれの相に単相整流器ユニットを平衡になるように接続し、一の不均衡な単相整流器ユニットを第一の相と第二の相との間に接続に、他の不均衡な単相整流器ユニットを第二の相と第三の相との間にそれぞれ接続してあることを特徴とする三相整流装置。 In a three-phase rectifier unit composed of multiple single-phase rectifier units, there are two unbalanced single-phase rectifier units, each phase of the three phases is connected by star connection, and each phase is a single phase Connect the rectifier units in a balanced manner, connect one unbalanced single-phase rectifier unit between the first phase and the second phase, and connect the other unbalanced single-phase rectifier unit to the second phase. A three-phase rectifier, wherein the three-phase rectifier is connected between the phase and the third phase. 前記二つの不均衡な単相整流器ユニットが両方とも接続されていない相における前記単相整流器ユニットの入力電圧を、装置の入力電流を平衡状態になるように下げるように制御する構成を有することを特徴とする請求項２記載の三相整流装置。
A configuration in which the input voltage of the single-phase rectifier unit in a phase where both of the two unbalanced single-phase rectifier units are not connected is controlled to lower the input current of the device to be in a balanced state. The three-phase rectifier according to claim 2, wherein
JP2005147575A 2005-05-20 2005-05-20 Three-phase rectifier instrument Pending JP2006325353A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017055544A (en) * 2015-09-09 2017-03-16 シャープ株式会社 Power factor improvement circuit and power supply device
US9793793B2 (en) 2015-06-26 2017-10-17 Sharp Kabushiki Kaisha Power factor correction circuit and power supply device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005006531A1 (en) * 2003-07-15 2005-01-20 Mitsubishi Denki Kabushiki Kaisha Three-phase power converter and power converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005006531A1 (en) * 2003-07-15 2005-01-20 Mitsubishi Denki Kabushiki Kaisha Three-phase power converter and power converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9793793B2 (en) 2015-06-26 2017-10-17 Sharp Kabushiki Kaisha Power factor correction circuit and power supply device
JP2017055544A (en) * 2015-09-09 2017-03-16 シャープ株式会社 Power factor improvement circuit and power supply device

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