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Abstract

A digitally controlled, transformer-coupled switching power supply for conversion of power between a source and a load includes a power switch that, when coupled to the source and cycled ON and OFF by a controller, supplies a pulse of power to the load. Control circuitry for the power converter includes a pulse generator for generating switch activation pulses to cycle the power switch, each switch activation pulse produced by the pulse generator defining a new switching cycle. A pulse rate controller is coupled to the pulse generator for regulating an output voltage at the load by selectively allowing, on a pulse by pulse basis, switch activation pulses to cycle the power switch. A pulse optimizer is coupled to the pulse generator, the pulse optimizer controlling one or both of (1) when the pulse generator generates a respective switch activation pulse to initiate a new switching cycle in order to minimize converter losses by effecting zero-voltage switching across the transformer, and (2) the width of the switch activation pulses in order to maintain constant primary side peak current, regardless of variations in input line voltage.

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First Claim