JPS59129343U

JPS59129343U - Overcurrent protection circuit

Info

Publication number: JPS59129343U
Application number: JP2315583U
Authority: JP
Inventors: 小高　賢一
Original assignee: 株式会社富士通ゼネラル
Priority date: 1983-02-19
Filing date: 1983-02-19
Publication date: 1984-08-30

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]

図面は本考案による過電流保護回路の一実施例を示す電
気回路図である。１・・・電池パック、２・・・機器本体、３１，３□。３３・・・接続端子、４・・・電池、５・・・第１トラ
ンジスタ、６・・・電源スィッチ、７，８・・・端子、
９・・・負荷、１０・・・第２トランジスタ、１１・・
・可変抵抗、１２゜１４．１５・・・抵抗、１３・・・
第３トランジスタ、　　　　１６・・・第４トランジス
タ、１７・・・制御回路。The drawing is an electrical circuit diagram showing an embodiment of the overcurrent protection circuit according to the present invention. 1...Battery pack, 2...Device body, 31, 3□. 33... Connection terminal, 4... Battery, 5... First transistor, 6... Power switch, 7, 8... Terminal,
9...Load, 10...Second transistor, 11...
・Variable resistance, 12゜14.15...Resistance, 13...
3rd transistor, 16...4th transistor, 17... control circuit.

Claims

[Scope of utility model registration request]

(1) The emitter-collector of a first transistor for main current control and a power switch are connected between the battery and the load, and the base circuit of the first transistor is connected to the base circuit of the first transistor to open and close the switch that operates when the power switch is turned on. In the control device, a second transistor is inserted, a third transistor whose base bias is the voltage between the emitter and collector of the first transistor, and the second transistor is turned off based on the turning on of the third transistor. An overcurrent protection circuit comprising: a fourth transistor;

(2) Utility Model Registration The overcurrent protection circuit according to claim 1, wherein the second transistor inserted into the base circuit of the first transistor includes a variable resistor connected in series.

(3) Utility Model Registration Scope of Claims In claim 1, the + side of the battery is connected to one side of the battery via the emitter/collector of the first transistor, the first connection terminal, the power switch, the load, and the third connection terminal. The base of the first transistor is connected to the collector-emitter of the second transistor,
The second transistor is connected to one side of the battery via a resistor, the base of the second transistor is connected to the load side terminal of the power switch via the resistor and a second connection terminal, and the emitter-collector of the first transistor is connected to one side of the battery. A series circuit of a resistor connected to the emitter and base of a third transistor is connected in parallel between the emitter and base of the third transistor, and a collector of the third transistor is connected to the base of a fourth transistor via the resistor.
An overcurrent protection circuit in which the collector of the transistor is connected to the base of the second transistor, and the emitter is connected to one side of the battery.