JPS5811993U

JPS5811993U - GTO inverter arm short circuit detection method

Info

Publication number: JPS5811993U
Application number: JP10397581U
Authority: JP
Inventors: 松村　卓司; 松田　靖夫; 一男本田
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 1981-07-15
Filing date: 1981-07-15
Publication date: 1983-01-25

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、第２図は従来技術の回路構成図、第３図は本考
案の１実施例のブロック構成図、第４図は疑似短絡状態
の回路状態を示す図、第５図は検出電圧波形の説明図、
第６図は第３図の本考案回路の動作波形を示す図、第７
図は本考案の他の実施例を示す検出回路のブロック構成
図、第８図は第７図の動作波形を示す図゛、第９！ｆｆ
１ｃｉ第３図の検出回路の具体的回路図、第１０図は第
７図の検出回路の具体的回路図である。１・・・受電電源、■・・・整流器、３・・・平滑リア
クトル、４・・・平滑コンデンサ、５・・・限流リアク
トル、１６・・・環流ダイオード、７・・・ＧＴＯイン
バータ、８・・・負荷、９・・・検出用シャント、１０
・・・検出信号増幅回路、１１・・・制御回路、１２・
・・検出用ＤＣＣＴ。１３・・・検出器、１４・・・バイアス回路、１５・・
・積分回路、１６・・・比較回路、１７・・・記憶回路
、１８・・・保護シーケンス回路、１９・・・ゲート回
路、２０・・・パルス電流供給回路、２１・・・パルス
電流供給用コンデンサ、２２・・・パルス電流供給用抵
抗、２３・・・パルス幅弁別器。Figures 1 and 2 are circuit configuration diagrams of the prior art, Figure 3 is a block diagram of an embodiment of the present invention, Figure 4 is a diagram showing the circuit state of a pseudo short circuit state, and Figure 5 is a detection voltage Waveform explanatory diagram,
Fig. 6 is a diagram showing the operating waveforms of the circuit of the present invention shown in Fig. 3;
The figure is a block configuration diagram of a detection circuit showing another embodiment of the present invention, and FIG. 8 is a diagram showing the operating waveforms of FIG. 7. ff
1ci is a specific circuit diagram of the detection circuit shown in FIG. 3, and FIG. 10 is a specific circuit diagram of the detection circuit shown in FIG. 7. 1... Power receiving power supply, ■... Rectifier, 3... Smoothing reactor, 4... Smoothing capacitor, 5... Current limiting reactor, 16... Freewheeling diode, 7... GTO inverter, 8 ...Load, 9...Detection shunt, 10
. . . detection signal amplification circuit, 11. . . control circuit, 12.
...DCCT for detection. 13...Detector, 14...Bias circuit, 15...
・Integrator circuit, 16... Comparison circuit, 17... Memory circuit, 18... Protection sequence circuit, 19... Gate circuit, 20... Pulse current supply circuit, 21... For pulse current supply Capacitor, 22... Resistor for pulse current supply, 23... Pulse width discriminator.

Claims

[Claims for Utility Model Registration] 1. In an inverter that uses a gate turn-off thyristor (hereinafter abbreviated as GTO) as a conversion element, a filter capacitor provided at the DC input section of the inverter, and a filter capacitor next to the filter capacitor. a current limiting reactor for suppressing energy released from the filter capacitor in the event of a short circuit in the inverter; a diode connected in parallel to the reactor with its cathode facing the filter capacitor; A circuit consisting of a capacitor and a resistor connected in series to supply a pulse current is
In the GTO inverter arm short-circuit detection device that is installed in parallel with the GTO inverter and detects the terminal voltage of the current limiting reactor and uses it as a short-circuit signal, the first means for detecting the terminal voltage of the reactor is followed by a first means for detecting the terminal voltage of the reactor. A GTO characterized by comprising a second means for cutting a voltage below a certain value, and a third means for determining whether the output of the second means is being output for a predetermined time or more. Inverter arm short circuit detection method. 2. In the statement of claim 1 of the utility model registration claim, the third means is a pulse width discrimination circuit that determines whether the pulse output from the second means has a predetermined pulse width. An arm short circuit detection method for a GTO inverter characterized by the following. 3. In the statement in paragraph 1 of the claims for utility model registration, a capacitor for supplying a pulse current or a circuit in which a capacitor and a resistor are connected in series is provided in parallel with the current limiting reactor, and a pre-voltage is detected at the end of the current limiting reactor. , an arm short circuit detection method for a GTO inverter, characterized in that the arm short circuit detection signal is used as an arm short circuit detection signal.