JPH04161026A - Power supply - Google Patents

Abstract

PURPOSE:To provide a contactor contact of only two circuits of and to use only one circuit for a preperatively charging circuit, by inserting connector contacts into 2 phases of a 3-phase AC power source, and connecting to one of these contacts a preparatively charging contact. CONSTITUTION:Contactor contacts 2 are inserted into the U phase and W phase of a 3-phase AC power source U, V, W, and no contact is inserted into the phase V. And a series circuit of a preparatively charging relay contact 5b and a charging current limiting resistor 7 is connected only to both ends of the contact 2 of the phase W. And after a breaker 1 is made, power is supplied from the U phase and W phase by the closing of the contact 5b, and a smoothing capacitor 4 is preparatively charged through the working of a rectifier circuit 3.

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は、三相交流電源に接続された整流器を介して
電源が供給される装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a device to which power is supplied via a rectifier connected to a three-phase AC power source.

［従来の技術］ 第２図は従来の電源供給装置を示す回路図である。[Conventional technology] FIG. 2 is a circuit diagram showing a conventional power supply device.

図中、Ｕ、Ｖ、Ｗは三相交流電源、（１）は交流電源Ｕ
、Ｖ、Ｗの各相に接続された配線用遮断器、（２）は配
線用遮断器（１）の各相に挿入された電磁接触器接点、
（３）はダイオードで構成され交流側がそれぞれ接点（
２）に接続された整流回路、（４）は整流回路（３）の
直流側に接続された平滑用コンデンサ、（５ａ）　（５
ｂ）は予備充電用リレー接点、（６）　（７）は充電電
流制限用抵抗で、接点（５ａ）と抵抗（６）及び接点（
５ｂ）と抵抗（７）はそれぞれ直列に接続されて、Ｕ相
及びＷ相の接点（２）の両端に接続されている。In the figure, U, V, and W are three-phase AC power supplies, and (1) is AC power supply U.
, V, and W phases, (2) is a magnetic contactor contact inserted into each phase of the molded circuit breaker (1),
(3) is composed of a diode, and the AC side is a contact (
2) is a rectifier circuit connected to (4) a smoothing capacitor connected to the DC side of rectifier circuit (3), (5a) (5
b) is the relay contact for pre-charging, (6) and (7) are the charging current limiting resistors, and the contact (5a), resistor (6) and contact (
5b) and the resistor (7) are connected in series and connected to both ends of the U-phase and W-phase contacts (2), respectively.

従来の電源供給装置は上記のように構成され。A conventional power supply device is configured as described above.

遮断器（１）が投入された後、一定時間（数秒）経過す
ると、予備充電用リレー接点（５ａ）（５ｂ）が閉成す
る。これで、充電電流制限用抵抗（６）　（７）を通じ
て電流が流れ、整流回路（３）により整流されて、平滑
用コンデンサ（４）の予備充電が開始される。平滑用コ
ンデンサ（４）の電圧が所定値に達すると、電磁接触器
接点（２）は閉成し、本充電が行なわれると共に、この
直流電源が直流サーボモータ等へ供給される。After a certain period of time (several seconds) has passed after the circuit breaker (1) is turned on, the preliminary charging relay contacts (5a) (5b) are closed. Now, current flows through the charging current limiting resistors (6) and (7), is rectified by the rectifying circuit (3), and preliminary charging of the smoothing capacitor (4) is started. When the voltage of the smoothing capacitor (4) reaches a predetermined value, the electromagnetic contactor contact (2) is closed, main charging is performed, and the DC power is supplied to the DC servo motor and the like.

［発明が解決しようとする課題］ 」二記のような従来の電源供給装置では、三相交流電源
Ｕ、Ｖ、Ｗの各相に挿入された接点（２）と、２相に挿
入された接点（５ａ）　（５ｂ）とを用いているため、
回路が複雑でコストが高くなり、かつ大形になるという
問題点がある。[Problems to be Solved by the Invention] In the conventional power supply device as described in 2, the contact (2) inserted into each phase of the three-phase AC power supply U, V, and W, and the contact (2) inserted into the second phase. Since contacts (5a) and (5b) are used,
There are problems in that the circuit is complicated, expensive, and large.

この発明は上記問題点を解決するためになされたもので
、回路が簡単にでき、コストが低減できるようにした電
源供給装置を提供することを目的とする。The present invention was made to solve the above problems, and it is an object of the present invention to provide a power supply device whose circuit can be simplified and costs can be reduced.

［課題を解決するための手段］ この発明に係る電源供給装置は、三相交流電源の２相に
接触器接点を挿入し、この接点の一方に予備充電用接点
を接続したものである。[Means for Solving the Problems] A power supply device according to the present invention has contactor contacts inserted into two phases of a three-phase AC power source, and a preliminary charging contact connected to one of the contacts.

［作　用］ この発明においては、三相交流電源の２相に接触器接点
を挿入し、この接点の一方に予備充電用接点を接続した
ため、接触器接点は２回路で済み、予備充電用回路も１
回路で済む。[Function] In this invention, a contactor contact is inserted into two phases of a three-phase AC power supply, and a pre-charging contact is connected to one of these contacts, so that only two circuits of contactor contacts are required, and the pre-charging circuit Also 1
Just a circuit.

［実施例］ 第１図はこの発明の一実施例を示す回路図であり、従来
装置と同様の部分は同一符号で示す。[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of the present invention, and parts similar to those of the conventional device are designated by the same reference numerals.

この実施例では、接触器接点（２）は三相交流電源Ｕ、
Ｖ、Ｗの内Ｕ相とＷ相とに挿入され、■相には接点は挿
入されていない。また、予備充電リレー接点（５ｂ）と
充電電流制限用抵抗（７）との直列回路は、Ｗ相の接点
（２）の両端だけに接続されている。In this embodiment, the contactor contact (2) is a three-phase AC power supply U,
It is inserted in the U phase and W phase of V and W, and no contact is inserted in the ■ phase. Further, the series circuit of the preliminary charging relay contact (5b) and the charging current limiting resistor (7) is connected only to both ends of the W-phase contact (2).

上記のように構成された電源供給装置においても、平滑
用コンデンサ（４）の充電動作は従来装置とほぼ同じで
ある。すなわち、遮断器（１）の投入後、接点（５ｂ）
の閉成により、Ｕ相及びＷ相から電源が供給され、整流
回路（３）により平滑用コンデンサ（４）は予備充電さ
れる。平滑用コンデンサ（４）の電圧が上昇すれば接点
（２）が閉成して本充電が行なわれる。Even in the power supply device configured as described above, the charging operation of the smoothing capacitor (4) is almost the same as in the conventional device. That is, after the circuit breaker (1) is closed, the contact (5b)
By closing, power is supplied from the U phase and W phase, and the smoothing capacitor (4) is precharged by the rectifier circuit (3). When the voltage of the smoothing capacitor (4) increases, the contact (2) closes and main charging is performed.

［発明の効果］ 以上説明したとおりこの発明では、三相交流電源の２相
に接触器接点を挿入し、この接点の一方に予備充電用接
点を接続したので、接触器接点は２回路で済み、予備充
電用回路も１回路で済み、低コストで小形な回路を構成
することができる効果がある。[Effects of the Invention] As explained above, in this invention, a contactor contact is inserted into two phases of a three-phase AC power supply, and a preliminary charging contact is connected to one of these contacts, so that only two circuits are required for the contactor contact. Also, only one pre-charging circuit is required, which has the effect of making it possible to construct a small circuit at low cost.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの発明による電源供給装置の一実施例を示す
回路図、第２図は従来の電源供給装置を示す回路図であ
る。 図中、Ｕ、Ｖ、Ｗは三相交流電源、（２）は電磁接触器
接点、（３）は整流回路、（４）は平滑用コンデンサ、
（５ｂ）は予備充電用リレー接点である。 なお、図中同一符号は同一部分を示す。 ＃１１図　、１，３ ＄２　　図FIG. 1 is a circuit diagram showing an embodiment of a power supply device according to the present invention, and FIG. 2 is a circuit diagram showing a conventional power supply device. In the figure, U, V, and W are three-phase AC power supply, (2) is a magnetic contactor contact, (3) is a rectifier circuit, (4) is a smoothing capacitor,
(5b) is a relay contact for preliminary charging. Note that the same reference numerals in the figures indicate the same parts. #11 figure, 1,3 $2 figure

Claims (1)

【特許請求の範囲】[Claims] 交流側が三相交流電源に接続された整流回路を有し、こ
の整流回路の直流側に平滑用コンデンサが接続されたも
のにおいて、上記三相交流電源の２相にそれぞれ挿入さ
れた接触器接点と、この接触器接点の一方の接点間に接
続され上記接触器接点の閉成に先立って閉成する予備充
電用接点とを備えたことを特徴とする電源供給装置。In a rectifier circuit whose AC side is connected to a three-phase AC power source, and a smoothing capacitor is connected to the DC side of this rectifier circuit, a contactor contact inserted into each of two phases of the three-phase AC power source and , and a preliminary charging contact that is connected between one of the contacts of the contactor and closes prior to closing of the contactor contact.