Switching type AC adapter circuit with a latch protection...

Details Switching type AC adapter circuit with a latch protection... Switching type AC adapter circuit with a latch protection...

2005-12-27

2005-12-27

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021150, C363S056100

Reexamination Certificate

active

06980443

ABSTRACT:
Disposed in a secondary side circuit and is connected to a constant voltage control circuit (22), to an overcurrent detection circuit (24), and to an overvoltage detection circuit (26), a photocoupler control circuit (28) controls a photocoupler (IC1) so as to feed a constant voltage detection control signal as a feedback signal back to a primary side circuit. The photocoupler control circuit (28) controls the photocoupler (IC1) so as to turn it off when the photocoupler control circuit is supplied with at least one of an overcurrent detected signal and an overvoltage detected signal. A voltage detection circuit (18) makes a latch circuit (16) operate when the voltage detection circuit detects a voltage induced in an auxiliary winding (NSLD) of a transformer with the photocoupler turned off, thereby making a switching operation of a switching type AC adapter circuit stop.

REFERENCES:
patent: 4428015 (1984-01-01), Nesler
patent: 5675485 (1997-10-01), Seong
patent: 5687066 (1997-11-01), Cook, II
patent: 5818670 (1998-10-01), Ahn
patent: 5835361 (1998-11-01), Fitzgerald
patent: 6005789 (1999-12-01), Lee
patent: 6088244 (2000-07-01), Shioya et al.
patent: 6094362 (2000-07-01), Domingo
patent: 2000-156972 (2000-06-01), None

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