Variable frequency soft switching power supply with reduced nois

Details Variable frequency soft switching power supply with reduced nois Variable frequency soft switching power supply with reduced nois

1998-12-03

2000-05-09

Riley, Shawn

Electric power conversion systems

Current conversion

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

363 21, H02M 3335

Patent

active

060612533

ABSTRACT:
A switching power supply uses zero-current and zero-voltage switching to reduce switching noise. A main switch and an auxiliary switch channel current and voltage between various component paths to maintain a DC output voltage while switching in zero-current or zero-voltage states. Switch ON-OFF time ratios are controlled with a simple scheme to improve the circuit power factor. The switching rate can be set to arbitrary frequencies, with switch ON time and OFF time being controlled independently. This scheme permits efficient driving of a load that is substantially less than the rated load, as generally found in portable TV circuits. The switches and control functions can be implemented on an integrated circuit.

REFERENCES:
patent: 4926303 (1990-05-01), Sturgeon
patent: 4985818 (1991-01-01), Niederreiter

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