Abstract: A flyback feedforward circuit for a pulse width modulated DC power supply in which the duty cycle is determined by varying the slope and peak amplitude of the sawtooth waveform under the influence of a weighted sum of input and output voltages.

Abstract: A boost feedforward circuit for a pulse width modulated DC power supply in which the duty cycle is determined by varying the error signal level with respect to the instantaneous level of a sawtooth waveform, under the influence of a feedforward portion of the input voltage.

Abstract: A novel feedback circuit for use in a DC-to-DC converter accurately adjusts the pulse width of the control pulses to a pair of switching transistors to minimize current imbalance. The switching transistors generate current pulses in the primary windings of a center tapped transformer. The feedback path senses the current pulses in the primary circuit of the transformer. A filter in the feedback path has a bandwidth centered at about the frequency of any current imbalance. The high gain, closed loop feedback path changes the slope of alternate linear ramp voltage pulses, and hence varies the pulse width of the pulses presented to the control terminals of the switching transistors.