Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-09-20
1999-08-03
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327530, 327540, 363 21, H02M 3335
Patent
active
059330490
ABSTRACT:
A power supply circuit, particularly a flyback converter, comprises a transformer having a secondary winding that powers a load device and/or a rechargeable battery via a rectifier diode. The secondary winding is short circuited by means of a switch connected in series with a diode. The short-circuit is detected by a measurement circuit comprising a measurement winding and a comparator which compares the amplitude variation of the voltage across the measurement winding with a threshold voltage. When a short-circuit is detected a control circuit for the control of the switching transistor of the flyback converter is changed over to a mode in which a given small current is supplied, which flows almost exclusively through the switch. As soon as the short-circuit ends the flyback converter resumes its normal mode of operation. If desired, the load device can control the desired current and/or voltage for powering the load device and charging the battery by turning on and turning off the switch.
REFERENCES:
patent: 4387418 (1983-06-01), Koike
patent: 4536696 (1985-08-01), Ray
patent: 4847742 (1989-07-01), Ohashi et al.
patent: 5101334 (1992-03-01), Plagge et al.
Biren Steven R.
Le Dinh
U.S. Philips Corporation
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