Driver and overload protection circuit

Details Driver and overload protection circuit Driver and overload protection circuit

1998-01-23

1999-08-24

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 361 98, 361110, H02H 300

Patent

active

059432055

ABSTRACT:
Driver and overload protection circuit for an electrical switch means. Switching control pulses with a minimum edge duration are fed to a two stage comparator circuit having first, lower and second, higher comparator threshold values. When the lower comparator threshold value is exceeded by a switching control pulse, the electrical switch means is rendered conducting. There is provided an overload detection circuit which, upon detection of overload of the electrical switch means, effects switching off of the same. For avoiding that turning on spikes upon each turning on of the electrical switch means, for example when switching capacitive loads, lead to deactivation of the switch means, any overload signal of the overload detector means is blocked as long as the instantaneous voltage value of the particular switching control pulse is not above the upper comparator threshold.

REFERENCES:
SGS Thomson Industrial and Standard Analog ICs, pp. 547 and 550, May 1993.
SGS Thomson Power MOS Devices, pp. 134-135, Jun. 1988.

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