JPS6039121U

JPS6039121U - protection circuit

Info

Publication number: JPS6039121U
Application number: JP12735683U
Authority: JP
Inventors: 寺田　章夫
Original assignee: 日本マランツ株式会社
Priority date: 1983-08-19
Filing date: 1983-08-19
Publication date: 1985-03-18

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 the drawing]

第１図はプロテエクション回路の従来例を示す、　回路
図、第２図は本考案プロテクション回路の一実施例を示
す回路図、第３図は本考案プロテクション回路に使用す
る負性抵抗素子の特性図である。１・・・プロテエクション回路、１′・・・プロテエク
ション回路、２・・・負荷部、８・・・第１のトランジ
スタ、９・・・第２のトランジスタ、１０・・・第１の
抵抗、１１・・・負性抵抗素子、１２・・・第２の抵抗
、１４・・・ツェナーダイオード。Figure 1 is a circuit diagram showing a conventional example of a protection circuit, Figure 2 is a circuit diagram showing an embodiment of the protection circuit of the present invention, and Figure 3 is a circuit diagram of a negative resistance element used in the protection circuit of the present invention. It is a characteristic diagram. DESCRIPTION OF SYMBOLS 1... Protection circuit, 1'... Protection circuit, 2... Load part, 8... First transistor, 9... Second transistor, 10... First 11... Negative resistance element, 12... Second resistor, 14... Zener diode.

Claims

[Claims for Utility Model Registration] A first transistor provided between the load and a power supply in order to supply the current required by the load, and a transistor provided between the base and collector of the first transistor. a second transistor which is supplied with a control current to the base side of the first transistor;
and the base/collector of the second transistor via a first resistor.
A switching element that stops supplying current when the potential difference between the collectors exceeds a predetermined value, and a second transistor between the base and emitter of the second transistor so that the current supply change of the switching element is most significant. second and third resistors that adjust the potential to a predetermined voltage or lower; and
a Zener diode provided between the base side of the transistor and the emitter side of the second transistor to apply a stable voltage to the load section.