JPS60167431U

JPS60167431U - Power transistor drive circuit

Info

Publication number: JPS60167431U
Application number: JP5536284U
Authority: JP
Inventors: 橋谷　勇慈; 耕作市川
Original assignee: 株式会社東芝
Priority date: 1984-04-17
Filing date: 1984-04-17
Publication date: 1985-11-07

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図は従来のパワートランジスタの駆動回路図、第２
図はパワートランジスタの蓄積時間対コレクタ電流との
関係を示した特性図、第３図はコレクタ電流をパラメー
タとした蓄積時間対逆バイアス電流特性図、第４図は本
考案の一実施例を示すパワートランジスタの駆動回路図
、第５図は第４図の回路の動作説明図、第６図は本考案
の他の実施例を示す回路図、第７図は第６図の回路の動
作説明図である。１１・１２・・・トランジスタ、１−３・・・パワート
ランジスタ、１５・・・コンデンサ、’１７・１８・１
９・２１・・・抵抗、２０・・・変流器、２２・・・ダ
イオード、２３・・・トランジスタ、２４・・・抵抗、
２５・・・ダイオード、２６・・・等価電圧源、３θ・
・・シャント抵抗。第３図、置Ｌ？ｔｌ　　２１＼＼＼−−／ｚ６Figure 1 is a drive circuit diagram of a conventional power transistor, Figure 2 is a drive circuit diagram of a conventional power transistor.
The figure shows a characteristic diagram showing the relationship between accumulation time and collector current of a power transistor, Figure 3 shows a characteristic diagram of accumulation time versus reverse bias current with collector current as a parameter, and Figure 4 shows an embodiment of the present invention. A drive circuit diagram of a power transistor, FIG. 5 is an explanatory diagram of the operation of the circuit of FIG. 4, FIG. 6 is a circuit diagram showing another embodiment of the present invention, and FIG. 7 is an explanatory diagram of the operation of the circuit of FIG. 6. It is. 11/12...Transistor, 1-3...Power transistor, 15...Capacitor, '17/18/1
9.21...Resistor, 20...Current transformer, 22...Diode, 23...Transistor, 24...Resistor,
25...Diode, 26...Equivalent voltage source, 3θ・
...Shunt resistance. Figure 3, place L? tl 21\\\\--/z6

Claims

[Scope of utility model registration request]

In a drive circuit for a power transistor including a capacitor for flowing a reverse current between the base and emitter when the power transistor is turned off, current detection means for detecting the collector current of the power transistor is provided, and an output signal of the current detection means is provided. A series circuit consisting of a transistor driven by a resistor and a resistor is connected to discharge the charge of the capacitor, and the charge of the capacitor is discharged in proportion to the magnitude of the collector current of the power transistor. A power transistor drive circuit characterized by supplying a pace emitter reverse current that is inversely proportional to its size.