JPS59114794U

JPS59114794U - Accident detection circuit for voltage source inverter

Info

Publication number: JPS59114794U
Application number: JP754383U
Authority: JP
Inventors: 浩一桑原
Original assignee: 株式会社明電舎
Priority date: 1983-01-22
Filing date: 1983-01-22
Publication date: 1984-08-02

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図は電圧形インバータの一般的な回路構成と事故検
出部の接続位置を示す回路図、第２図は従来の事故検出
回路の構成例を示す回路図、第３図Ａ及び第３図Ｂはイ
ンバータ正常動作時の第２図の事故検出回路へ入力され
る各相間電圧と検出回路の出力を夫々示す波形図、第４
図Ａ乃至第４図Ｃは、インバータ１相オープン時の第２
図の事故検出回路へ入力される各相の電位、対応した相
間電圧及び検出回路の出力を夫々示す波形図、第５図は
本考案に係る電圧形インバータの事故検出回路の一実施
例を示す回路図、第６図Ａ及び第６図Ｂは、夫々インバ
ータ正常動作時、１相オープン時の第５図の事故検出回
路の出力を示す波形図である。２０・・・ブリッジ回路、３０・・・検出部、４２・・
・ダイオード・ブリッジ回路、４４・・・フォト・カプ
ラ、　　・４８・・・制御電源。０ −Ｒ側ｉｏ□ Ｇへン　　　ＳＱイｉ０Ｔ“１」［。（Ｂ）　ｓ−ｉ電り。ロ］ヨユヨ］− １−８覧ＬＱ　　−−Figure 1 is a circuit diagram showing the general circuit configuration of a voltage source inverter and the connection position of the fault detection section, Figure 2 is a circuit diagram showing an example of the configuration of a conventional fault detection circuit, Figures 3A and 3 B is a waveform diagram showing each phase voltage input to the fault detection circuit in Fig. 2 and the output of the detection circuit when the inverter is operating normally;
Figures A to 4C show the 2nd phase when the inverter 1 phase is open.
Figure 5 is a waveform diagram showing the potential of each phase input to the fault detection circuit, the corresponding phase-to-phase voltage, and the output of the detection circuit, respectively. Fig. 5 shows an embodiment of the fault detection circuit for a voltage source inverter according to the present invention. The circuit diagrams, FIG. 6A and FIG. 6B, are waveform diagrams showing the output of the fault detection circuit of FIG. 5 when the inverter is in normal operation and when one phase is open, respectively. 20... Bridge circuit, 30... Detection section, 42...
- Diode bridge circuit, 44... Photo coupler, -48... Control power supply. 0 -R side io□ G to SQ ii0 T “1” [. (B) s-i electric. B] Yoyuyo] - 1-8 list LQ --

Claims

[Scope of utility model registration request]

(1) In a voltage source inverter in which switching elements are connected in a multiphase bridge configuration and the gate of each switching element is controlled to obtain a desired inverter output voltage,
A detection unit comprising a diode bridge connected to the output end of the inverter and a photocoupler for taking out the detection voltage rectified by the diode bridge, and a gate signal to at least one phase switching element of the multi-use bridge. 1. An accident detection circuit for a voltage source inverter, characterized in that the loss of the voltage source is detected as a change in the output level of a photocoupler provided in the detection section.

(2) The fault detection circuit for a voltage type inverter according to claim 1, wherein the photocoupler has a control power supply connected to the output end of the photodetector transistor.