Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-08-14
1999-05-25
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 18, 361 58, 361113, H02H 300
Patent
active
059074639
ABSTRACT:
An overcurrent protection circuit for a switching mode power supply which has a switching transformer for transforming a rectified voltage into a plurality of drive voltages and a pulse width modulation circuit for generating a pulse width modulation signal in response to a desired one of the drive voltages from the switching transformer. The overcurrent protection circuit is connected between a drive voltage output terminal of the switching transformer and a drive voltage input terminal of the pulse width modulation circuit. The overcurrent protection circuit consists of a parallel circuit composed of an inductance and a resistance. When the switching transformer is short-circuited, the overcurrent protection circuit accelerates a drop of the drive voltage which is supplied from the switching transformer to the pulse width modulation circuit. The overcurrent protection circuit rapidly cuts off an overcurrent due to a short-circuit which is caused in electric or electronic equipment containing the switching mode power supply device. Therefore, components in the equipment can be protected from the overcurrent due to a short-circuit.
REFERENCES:
patent: 5003451 (1991-03-01), Gradl et al.
patent: 5499154 (1996-03-01), Cullison
Bushnell Esq. Robert E.
Gaffin Jeffrey
Jackson Stephen W.
Samsung Electronics Co,. Ltd.
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