Pulse width modulation and protection circuit

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

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361 59, 315307, H02H 300

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active

057484287

ABSTRACT:
A pulse width modulation circuit includes a transistor pass element alternately switched on and off by an oscillator and connecting a power source to a load. Current through the transistor pass element is compared to a reference signal by a comparator. If the current through the transistor pass element exceeds the reference signal, the comparator generates a fault signal, and the transistor pass element is switched off for the remainder of the cycle. After a predetermined number of faults, the transistor pass element is switched off for a plurality of cycles. The pulse width modulation circuit prevents damage to the transistor pass element caused by the low initial resistance of the load and supplies sufficient current to slowly heat the load to steady state operation. This also allows for downsizing of the pass element for steady state conditions thereby saving product cost.

REFERENCES:
patent: 4477748 (1984-10-01), Grubbs
patent: 4686428 (1987-08-01), Kuhnel et al.
patent: 4739226 (1988-04-01), Murata
patent: 4761702 (1988-08-01), Pinard
patent: 4825144 (1989-04-01), Alberkrack et al.
patent: 4994934 (1991-02-01), Bouhenguel
patent: 5001398 (1991-03-01), Dunn
Article: EDN Sense-cell MOSEFET eliminates losses in source circuit, Jun. 1986.

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