A pulse width modulated voltage regulator-converter/power converter for regulating and converting a bulk voltage to a stepped down regulated output voltage thereby eliminating instability effects over a wide range of static load conditions comprising, in combination:
- control means being responsive to a ripple voltage on said regulated output voltage for generating an amplified pulse width modulated control voltage at a first output, and for generating first and second amplified clock pulses in synchronism therewith at second outputs;
- regulator means having a first input connected to said bulk voltage and a second input connected to said first output of said control means for providing a switched voltage at its output substantially equal in amplitude to said bulk voltage and in response to said amplified pulse width modulated control voltage;
- averaging filter means connected to said output of said regulator means being responsive to said switched voltage of said regulator means for providing a filtered regulated voltage at a first output, and for providing a "feedforward" voltage in phase with said switched voltage of said regulator means at second outputs;
- said averaging filter means being comprised of a transinductor having a primary and a secondary winding, said primary winding having one end connected to said output of said regulator means and the other end connected to a shunt capacitor to ground, the inductance of said primary winding cooperating with said shunt capacitor providing, thereby, said filtered regulated voltage at said first output of said averaging filter, and said secondary winding providing said "feedforward" voltage to said second outputs;
- said averaging filter being further comprised of a flyback diode means having a cathode connected to said output of said regulator means and an anode connected to ground for clamping voltage transients;
- converter means configurated in a "current mode" push-pull circuit having a first input connected to said first output of said averaging filter means, and second inputs connected to said second outputs of said control means providing at its outputs, alternately, stepped down switched regulated voltages in synchronism with said switched voltage of said regulator means, and in response to said amplified clock pulses and said filtered regulated voltage;
- full wave rectification means connected to said outputs of said converter means for rectifying said stepped down switched regulated voltages of said converter means, the output of said rectification means being connected to one of said second outputs of said averaging filter means;
- and
- converter filter means having a series inductor and a shunt capacitor to ground, one end of said series inductor being connected to the other one of said second outputs of said averaging filter means for filtering said output voltage of said rectification means, and for filtering said "feedforward" voltage providing, thereby, at a load, said ripple voltage corresponding substantially to said "feedforsard" voltage, and said filtered regulated output voltage corresponding substantially to said stepped down switched regulated voltages, said ripple voltage being in phase with said switched voltage of said regulator means providing thereby stable closed loop load regulation.