Patent ID: 7558082

Claim:
A power converter for supplying an output power to a load, comprising: a switching device having a switching input, a switching output, and a control input for enabling or disabling said switching device from conducting current from said switching input to said switching output; and a network wherein said switching device input, said switching device output, and the load are connected together in a circuit; a bias winding in said circuit for producing a bias voltage representative of the output power; and a control circuit for (a) determining the rate of change of said bias voltage, (b) characterizing said rate of change, and (c) controlling said control input as a result of the characterization (b); the control circuit being responsive to the characterized bias voltage rate of change to control the switching device and (i) effect a heavy load mode of operation of the power converter when the rate of change is above a predetermined level and (ii) effect a light load mode of operation of operation of the power converter when the rate of change is below the predetermined level.