Overcurrent detection method and detection circuit

Details Overcurrent detection method and detection circuit Overcurrent detection method and detection circuit

2005-09-20

2008-11-04

Ullah, Akm E (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

C361S098000, C361S100000, C361S101000, C320S134000

Reexamination Certificate

active

07446507

ABSTRACT:
In a load-driving apparatus with a FET between a battery and a load, an overcurrent detection circuit has a function generation circuit with a voltage divider circuit and a comparator. The voltage divider circuit has a pair of resistors connected to a drain of the FET, and a Zener diode connected to a connection point in parallel to the second resistor. The comparator compares a reference voltage at the connection point with a variable voltage of the FET, and outputs an overcurrent detection signal when the variable voltage becomes lower than the reference voltage. When no overcurrent exists and the battery voltage is not decreasing, the connection point is kept at a breakdown voltage of the Zener diode, and the difference with respect to the source voltage of the FET becomes particularly large. The comparator therefore does not erroneously output an overcurrent detection signal even when noise enters the system.

REFERENCES:
patent: 5559500 (1996-09-01), Kase
patent: 6094092 (2000-07-01), Mizuno et al.
patent: 6232742 (2001-05-01), Wacknov et al.
patent: 11-51983 (1999-02-01), None
patent: 2002-290222 (2002-10-01), None
patent: 0162847 (1999-04-01), None

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