Switching power supply with raster width stabilization

Details Switching power supply with raster width stabilization Switching power supply with raster width stabilization

H - Electricity

04

N

355/9

H04N 3/185 (2006.01) H04N 5/63 (2006.01)

Patent

CA 1266131

RCA 83,165 Abstract In a switching power supply for a video display apparatus, the primary winding of an isolation power transformer is coupled to a chopper switch and to an AC mains rectified input voltage source. A control circuit regulates the conduction of the chopper switch. A B+ voltage for a horizontal deflection circuit is generated from a first secondary winding electrically isolated from the primary winding. An audio supply voltage for a power audio circuit is generated from a second secondary winding also electrically isolated from the primary winding. A first feedback winding, more tightly coupled magnetically to the first secondary winding, and a second feedback winding, more tightly coupled to the second secondary winding, develop respective feedback voltages. The feedback voltages are proportionally summed and applied to the control circuit to vary the conduction of the chopper switch in a manner that regulates the secondary winding voltages and stabilizes raster width with audio loading changes.

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