Abstract: A switch-mode power supply includes the series combination of an inductor and a controllable switch adapted to be coupled to a voltage source for producing a succession of increasing and decreasing ramp currents through the inductor. The average value of the ramp currents is controlled by a feedback loop. A second controllable switch arrangement is coupled for causing the current leaving the inductor to recirculate through the inductor during those intervals in which the second switch is conductive. An integrator is coupled to the inductor for integrating ramp current from the inductor during those intervals in which the second switch is nonconductive, for generating load voltage. A second feedback arrangement senses the load voltage and controls the average conduction of the second switch to control the load voltage. In one embodiment, an inverter receives ramp current from the inductor and generates alternating current, which are transformed and rectified before application to the integrator.

Abstract: A DC-to-AC inverter includes a switched bridge circuit. The bridge is energized by a source of substantially constant direct current. In order to reduce stress on the switches of the bridge, periods of conductivity of the switches of the bridge are overlapped, so that all the legs of the bridge are conductive simultaneously in two operating intervals out of a recurrent operating sequence of four operating intervals. Each switch is associated with a snubber circuit including a snubber capacitor which bypasses or absorbs switch current during turn-off. The charge retained on the snubber capacitor after complete turn-off of the associated switch represents energy which can be reused. The capacitor must be discharged in readiness for the next turn-off of the associated switch.

Abstract: Switching stress on the switches of a DC-to-AC inverter bridge are reduced, and fall time losses are reduced, by driving the inverter from a source of constant current, by operating the bridge in a mode in which all the switches are periodically rendered conductive simultaneously, and by tuning the load to produce resonant currents which reduce the currents through the switches of the inverter at the moment of turn-off.

Abstract: DC-to-dc switching converters that deliver non-pulsating output current use a conventional transformer and a flyback transformer with primary windings recurrently connected in series to the primary d-c energy source and with secondary windings alternately connected to the output load.

Abstract: A push-pull switching dc-to-dc converter using controlled rectifiers as switch elements delivers uninterrupted output current to its load, owing to the inclusion of plural-winding inductors.