Switching power supply

Details Switching power supply Switching power supply

1999-01-20

2000-08-29

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

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

363 97, 363132, H02M 3335

Patent

active

061117625

ABSTRACT:
A switching power supply for outputting an isolated DC voltage includes a transformer TR1 having a secondary winding N21 and a tertiary winding N3; a semiconductor switch Q1; a DC voltage source (capacitor) C1 connected to the transformer TR1 and the semiconductor switch Q1; a rectifier D1 connected to the secondary winding N21; a power IC, the power supply voltage for which is obtained by rectifying the output of the tertiary winding N3 of the transformer TR1; and a comparator IC5 for detecting the voltage of the control power supply that is lower than a predetermined value, by which to shift to the power saving mode of operation. The above configuration eliminates the photo-coupler for transmitting the power saving signal and reduces the number of terminals of the power IC.

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patent: 5825638 (1999-10-01), Shutts
patent: 5917711 (1999-06-01), Shikata et al.

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