The present invention is directed to a switch mode power converter for
supplying an output power to a load, which includes a switching device
having a switching input, a switching output, and a control input for
enabling or disabling the switching device from conducting current from
the switching input to the switching output. The converter also includes
a network in which the switching device input, the switching device
output, and the load are connected together to form a circuit. The
converter also includes a bias winding in the circuit for producing a
bias voltage representative of the output power, and a control circuit.
The control circuit is for (a) determining the rate of change of the bias
voltage, (b) characterizing the rate of change, and (c) controlling the
control input as a result of the characterization (b).