JPS6034785U

JPS6034785U - Inverter overvoltage suppression circuit

Info

Publication number: JPS6034785U
Application number: JP12473183U
Authority: JP
Inventors: 俊郎小林
Original assignee: 富士電機株式会社
Priority date: 1983-08-11
Filing date: 1983-08-11
Publication date: 1985-03-09

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は自励式電流形インバータの従来例を示す主回路
接続図、第２図は第１図に示すインバータの出力波形図
である。第３図は本考案の実施例を示す主回路接続図で
ある。１０・・・・・・サイリスタ整流器、１２・・・・・・
直流リアクトル、１４・・・・・・自励式電流形インバ
ータ、１５・・・・・・インバータサイリスタ、１６・
・・・・・転流コンデンサ、１７・・・・・・インバー
タダイオード、１８・・・・・・誘導電動機、２０・・
・・・・ダイオード整流器、２２・・・・・・コンデン
サ、２４・・・・・・抵抗、２６・・・・・・スイッチ
ング手段としてのトランジスタ、２８・・・・・・電圧
検出回路、３０・・・・・・トランジスタ制御回路。FIG. 1 is a main circuit connection diagram showing a conventional example of a self-excited current source inverter, and FIG. 2 is an output waveform diagram of the inverter shown in FIG. FIG. 3 is a main circuit connection diagram showing an embodiment of the present invention. 10... Thyristor rectifier, 12...
DC reactor, 14...Self-excited current source inverter, 15...Inverter thyristor, 16.
... Commutation capacitor, 17 ... Inverter diode, 18 ... Induction motor, 20 ...
... Diode rectifier, 22 ... Capacitor, 24 ... Resistor, 26 ... Transistor as switching means, 28 ... Voltage detection circuit, 30 ...Transistor control circuit.

Claims

[Scope of utility model registration request]

(1) DC power from a variable voltage DC power supply is applied to a self-excited current source inverter via a DC reactor, and the AC power output from the inverter drives an AC motor, and the DC power is applied to the DC side of a bridge-connected rectifier. In a self-excited current source inverter in which a parallel connection circuit of a capacitor and a resistor is connected and the rectifier is connected in parallel to the AC motor, a switching means for connecting the rectifier in parallel to the parallel connection circuit of the capacitor and the resistance on the DC side of the rectifier; , a voltage detection means for detecting the voltage between the electrodes of the capacitor, and a constant value that closes the switching means when the voltage between the electrodes of the capacitor is equal to or higher than a predetermined value, and the voltage between the electrodes of the capacitor is below the predetermined value. An overvoltage suppression circuit for an inverter, comprising: switching control means that opens the switching means when the following conditions occur.

(2) Utility model registration In the overvoltage suppression circuit according to claim 1, the switching means is turned on and off at high speed.
An overvoltage suppression circuit for an inverter, comprising a semiconductor switching element that repeatedly turns off and changes the ratio of on and off times to form an open state and a closed state.