JPS59142816U

JPS59142816U - Constant voltage circuit output short circuit prevention circuit

Info

Publication number: JPS59142816U
Application number: JP3681183U
Authority: JP
Inventors: 出山田; 友岡　啓二
Original assignee: 株式会社日立製作所
Priority date: 1983-03-16
Filing date: 1983-03-16
Publication date: 1984-09-25

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図は従来の定電圧回路の出力短絡防止回路を例示す
る回路図、第２図は本考案による定電圧回路の出力短絡
防止回路の一実施例を示す回路図、第３図は第２図の自
己バイアス回路の定電流ダイオードの電流特性側図であ
る。１・・・定電圧源回路、２・・・電流制限回路、３・・
・電流検出回路、４・・・負荷、５・・・電流制限トラ
ンジスタ、６・・・自己バイアス、８・・・電流検出抵
抗、９・・・バイパス用トランジスタ、１０・・・定電
流ダイオ−゛　ド。FIG. 1 is a circuit diagram illustrating a conventional output short-circuit prevention circuit for a constant voltage circuit, FIG. 2 is a circuit diagram illustrating an embodiment of an output short-circuit prevention circuit for a constant voltage circuit according to the present invention, and FIG. FIG. 3 is a side view of the current characteristics of the constant current diode of the self-bias circuit shown in FIG. 1... Constant voltage source circuit, 2... Current limiting circuit, 3...
・Current detection circuit, 4...Load, 5...Current limiting transistor, 6...Self bias, 8...Current detection resistor, 9...Bypass transistor, 10... Constant current diode゛ Do.

Claims

[Scope of utility model registration request]

A current limiting circuit consisting of a constant voltage source circuit, a current limiting element connected to this, and a constant current element forming its self-bias circuit, a current detecting element connected to this, and an output based on the detected current of this current detecting element. It consists of a current detection circuit consisting of a bypass switching element that bypasses the current of the bias circuit to the output side in the event of a short circuit, and in steady state it obtains a more stable output voltage than the output of the current detection circuit, and in the event of an output short circuit, the bypass switch An output short-circuit prevention circuit for a constant voltage circuit having constant current characteristics that limits overcurrent to the current detection circuit and load by the action of an element.