A highly efficient inductorless voltage regulator

This versatile and highly efficient voltage regulator, for applications where the conventional series regulator and the inductor type of switching regulator are impractical, uses solid-state switching techniques. Efficiencies greater than 90 percent have been achieved, independent of input voltage amplitudes. Good load regulation is provided, with a ripple increase as the main effect of a load-current increase. High-peak-current capability is another major advantage of the regulator. The circuit described successfully delivers power peaks of 600 watts. Output voltage restoration from the power line is accomplished as quickly as possible. Some applications of the regulator are prereugulation, class-B audio amplifiers, and solenoid driving.