JPH03128330U

JPH03128330U -

Info

Publication number: JPH03128330U
Application number: JP3679290U
Authority: JP
Priority date: 1990-04-05
Filing date: 1990-04-05
Publication date: 1991-12-24

Description

[Brief explanation of drawings]

図面は本考案の実施例を示し、第１図は車両用
継電器への適用例を示す回路図、第２図、第３図
、第４図及び第５図は作動を示す波形図である。１……車両用継電器（電子スイツチ回路）、２
……操作スイツチ、３……ランプ負荷、６……ト
ランジスタ（パワーＭＯＳＦＥＴ）、７……駆動
回路、８……過電流検出回路、９……禁止回路、
１０……タイマ回路、１１……ラツチ回路。 The drawings show an embodiment of the present invention, and FIG. 1 is a circuit diagram showing an example of application to a vehicle relay, and FIGS. 2, 3, 4, and 5 are waveform diagrams showing the operation. 1... Vehicle relay (electronic switch circuit), 2
...Operation switch, 3...Lamp load, 6...Transistor (power MOSFET), 7...Drive circuit, 8...Overcurrent detection circuit, 9...Prohibition circuit,
10...Timer circuit, 11...Latch circuit.

Claims

[Claims for Utility Model Registration] A transistor connectable to an external load; a drive circuit that applies a high-potential drive signal to the gate of the transistor to turn the transistor on in accordance with an external control signal; and the transistor. an overcurrent detection circuit that detects a load current flowing through the circuit and outputs an overcurrent signal when the current is equal to or higher than a predetermined value; and when the overcurrent signal is generated, the gate potential of the transistor is forced regardless of the presence or absence of the drive signal. a timer circuit that outputs a time signal when the drive signal is continuously output for a predetermined period of time or more; an electronic switch circuit comprising: a latch circuit that self-maintains the operation of the prohibition circuit when an overcurrent signal is generated;