JPS6393793U

JPS6393793U -

Info

Publication number: JPS6393793U
Application number: JP18997186U
Authority: JP
Priority date: 1986-12-10
Filing date: 1986-12-10
Publication date: 1988-06-17

Description

[Brief explanation of the drawing]

第１図は本考案の実施例を示す主回路接続図で
あり、第２図は交流電動機を駆動する電流形イン
バータの転流動作時にあらわれるサージエネルギ
ーを電源へ返還する従来例を示した主回路接続図
、第３図は第２図に示す電流形インバータの出力
波形をあらわした波形図である。２…交流電源、３…電源側整流器としてのサイ
リスタ整流器、４…直流リアクトル、５…電流形
インバータ、６…誘導電動機、１１…第２整流器
としてのダイオード整流器、１２…コンデンサ、
１３…リアクトル、１４…限流抵抗、１５…第２
インバータ、１６…ヒユーズ、２１…計器用変圧
器、２２…停電検出器、２３…スイツチ素子制御
手段としてのトランジスタ制御回路、２４…スイ
ツチ素子としてのトランジスタ。 Fig. 1 is a main circuit connection diagram showing an embodiment of the present invention, and Fig. 2 is a main circuit showing a conventional example of returning surge energy generated during commutation operation of a current source inverter that drives an AC motor to a power source. The connection diagram, FIG. 3, is a waveform diagram showing the output waveform of the current source inverter shown in FIG. 2... AC power supply, 3... Thyristor rectifier as a power supply side rectifier, 4... DC reactor, 5... Current source inverter, 6... Induction motor, 11... Diode rectifier as a second rectifier, 12... Capacitor,
13...Reactor, 14...Current limiting resistor, 15...Second
Inverter, 16... fuse, 21... instrument transformer, 22... power failure detector, 23... transistor control circuit as switch element control means, 24... transistor as switch element.

Claims

[Scope of utility model registration request]

A variable voltage DC output from a power source rectifier connected to an AC power source is applied to a current source inverter via a reactor, and the AC motor is operated at variable speed with the AC output from the current source inverter.
A second rectifier connected to the AC output side of the current source inverter and a capacitor connected to the DC side of the second rectifier store surge energy generated during commutation operation of the current source inverter in the capacitor, In a current source inverter that controls the stored energy to be given to a second inverter via a current limiting resistor and returns the AC converted by the second inverter to the AC power source, the current source inverter is parallel to the current limiting resistor. A switch element to be connected, a power failure detection means for detecting a power outage of the AC power source, and a switch element that maintains the switch element in an open state until a predetermined period of time has elapsed after the power failure is restored in the event of a power outage of the AC power source. 1. A control circuit for a current source inverter, comprising: control means.