Device for detecting failure of field effect transistor

Details Device for detecting failure of field effect transistor Device for detecting failure of field effect transistor

2005-04-05

2005-04-05

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S086000, C361S023000

Reexamination Certificate

active

06876531

ABSTRACT:
A device for detecting failure of a field effect transistor (FET) includes a first FET1 connected in series with a motor M between a power source terminal and ground, a motor control unit11for on/off controlling a voltage to be applied to said motor to set normal/reverse operation and stopping of said motor, a gate control unit for on/off controlling a gate voltage to be applied to said FET to control driving of said motor, a voltage applying means VB, R1for applying a positive voltage at a prescribed voltage level to the current input terminal of the FET; a voltage detecting unit CMP1 for detecting the voltage level of the positive voltage thus applied when said gate voltage is off; and a failure detecting unit14for detecting short-circuiting failure of the FET on the basis of a change in the voltage level detected by said voltage detecting unit when said gate voltage is off while said motor stops. In this configuration, failure of the FET for controlling driving of the motor can be detected both when the motor stops and operates.

REFERENCES:
patent: 4562387 (1985-12-01), Lehnhoff
patent: 4575662 (1986-03-01), Lehnhoff
patent: 5041940 (1991-08-01), Sullivan
patent: 5396118 (1995-03-01), Yaguchi
patent: 5914545 (1999-06-01), Pollersbeck
patent: 6023107 (2000-02-01), Grass
patent: 6222709 (2001-04-01), Baba
patent: 6400110 (2002-06-01), Yabe et al.
patent: 6624604 (2003-09-01), Torikoshi et al.

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