Abstract: A DC to DC power converter circuit has a current fed inverter with a series connected first diode and a capacitor connected in parallel with the legs of the inverter. The diode is poled to provide current to the capacitor at the beginning of each inverter switching cycle as energy is passed from the circuit to an output transformer-rectifier circuit. A recirculation inductor and an additional diode are connected in parallel with the legs of the inverter with the additional diode poled to recirculate current in the recirculation inductor. Then a switch between the junction of the capacitor and first diode and also between the additional diode and recirculation inductor provides for discharging of the capacitor without power dissipation during the inverter operation instead of dissipating and losing the energy. Thus the recirculation is accomplished by few components to provide a lossless clamp circuit for recirculating the energy in the circuit from the capacitor back to the recirculation inductor.

Abstract: A three phase AC to DC converter has an AC driven regulated current source, and it is provided with an unregulated current controller inverter. The zero crossing of the AC voltage input is monitored by a feedback control signal to a switching controller which is coupled to the current control switches of the regulated current source. In addition, the inverter is unregulated and current fed or controlled, and it is coupled to a high frequency current sensor in the preferred form of a current transformer, for sensing current flowing into the converter and which forms part of a control circuit for controlling the switching of the three phase AC regulated current source inputs for drawing currents. The unregulated current controlled inverter has an H bridge with series connected switches and a first diode (D1) and a second diode (D2) and a fifth switch (S12) in order not to dissipate energy.

Abstract: A buck switching regulated power supply having a first feedback loop which is relatively slow, so as to prevent rapid changes in the output current from being reflected to the input current. A second, faster feedback loop having a higher loop gain is provided, and is arranged to take over when the load voltage reaches a predetermined level, so as to prevent the load voltage from rising above such level.

Abstract: A three phase A.C. to single phase A.C. converter wherein the output voltage is not disturbed if one of the input phase lines becomes inoperative. The three phase A.C. is first rectified, and a D.C. voltage is derived from the resulting rectified D.C. current. The D.C. voltage is regulated, and a single phase A.C. voltage is generated from the regulated D.C. voltage.

Abstract: A dual-switch transformer-coupled switching regulator is provided with a non-dissipative snubber circuit arrangement wherein the resonant elements thereof include an inductor serially connected between two capacitors through a diode switch. The snubber has two other diode switches that are connected on mutually exclusive ones of the same sides of the capacitors that are connected to the inductor. Each of the last two mentioned diode switches connects the respective aforementioned side of the particular capacitor to the outer main terminal of a mutually exclusive one of the dual transistor switches of the regulator. The other side of the particular capacitor is connected to the other main terminal of the other one of the dual transistor switches. The arrangement minimizes any deleterious effects caused when the dual switches are being switched.