Abstract: An energy management controller (EMC) for use with series connected amplifier modules monitors the rail voltage across an energy storage capacitor which drives the amplifier modules, and compares the rail voltage with a reference voltage. The EMC controls the direction of energy flow to either provide power to one of the amplifier modules to add energy to the energy storage capacitor, or to provide power to the load.

Abstract: A novel, compact, converter structure utilizes a switching bridge configuration to provide a low voltage stress, constant frequency controlled converter whose switches and diodes all turn-on and turn-off with zero-voltage-switching. The novel converter configuration uses a full-bridge switching circuit comprising four diodes D.sub.1 -D.sub.4 and, in one embodiment, four active semiconductor switches S.sub.1 -S.sub.4. A resonant inductor L.sub.r is connected across the bridge nodes a and b, and parasitic capacitance of the diodes and active switches S.sub.1 -S.sub.4 are incorporated in an L-C circuit. Connected in parallel with the bridge is a voltage source or sink, depending on the direction that power will flow; and connected to node a or b is a current source or sink, again depending upon the direction of power flow. The present invention stores sufficient energy in the resonant inductor L.sub.

Abstract: A novel ZVS single-ended converter configuration is provided which eliminates high voltage stresses inherent in most ZVS circuits. The present invention incorporates a mechanism for passively limited all switch voltages to whatever voltage sources are present in the converter. The voltage limiting mechanism is maintained even when driving gate signals fail, thus yielding a reliable voltage clamping mechanism. In addition, the driving waveforms for the main and auxiliary switch may be essentially complementary, thus requiring a simple driving circuit. The invention is controlled by varying the switching frequency of the switches while maintaining a constant duty cycle for each switch.

Abstract: A soft-switching circuit for achieving zero-voltage-transition (ZVT) type commutation in switching power converters includes a magnetic feedback circuit for achieving substantially zero voltage turn on of the active power switches and for achieving zero voltage turn off of the passive power switches of the switching power converter.

Abstract: A high power factor AC to DC converter with shunt regulation include first and second power converters for converting AC power to DC power; the first power converter receives and regulates input power from a power source and delivers a component of an output power to a load. The second power converter delivers another component of the output power to the load. The first power converter includes a unidirectional power output connected to the load.

Abstract: A compact, high frequency, zero voltage switching quasi-resonant converter with a multi-resonant, bi-polar switch includes a resonant switch (S), a first diode (D.sub.p) in parallel with the switch (S), a second diode (D.sub.s)in series with the switch (S), first (C.sub.r1) and second (C.sub.r2) resonant capacitors and a resonant inductor (L.sub.r). The first resonant capacitor (C.sub.r1) is operatively connected to the resonant switch (S) such that any voltage change across the first resonant capacitor (C.sub.r1) necessitates a corresponding voltage change across the resonant switch (S). The second resonant capacitor (C.sub.r2)is operatively connected to the second diode (D.sub.s) such that any voltage change across the second resonant capacitor (C.sub.r2) necessitates a corresponding voltage change across the second diode (D.sub.p). The resonant inductor (L.sub.r) is operatively connected in series with the resonant switch (S) such that any current change through the resonant inductor (L.sub.