Abstract: A DC-DC power converter cell is disclosed which incorporates novel control circuits that operates the cell at efficiencies of 88%. This cell also has control-in and control-out terminals whereby multiple cells are intercoupled to operate in synchronization with each other as a versatile system of cells. Manufacturing cost is reduced by utilizing a simply configured single-turn high-frequency transformer in each cell, and by operating at efficiencies that reduce cooling requirements.

Abstract: A single-ended DC-to-DC power converter which is operative at very high switching frequencies with zero-voltage resonant transition switching. A single magnetic element functions as both a storage inductor and a transformer. A charging capacitor is switched to induce a reversal current through the inductor for providing the zero-voltage switching function. Control to output characteristics are identical to those of conventional buck and buck-boost converters. The invention provides efficient, high-frequency operation and isolation of the output from the input power source with minimal component volume. The control system is adaptable to constant frequency pulse width modulation for voltage regulation.

Abstract: A DC-to-DC power converter topology utilizing parallel connected transformers in a buck switching configuration with each stage operated 180.degree. out-of-phase, with the primary windings of the transformers sequentially feeding into a common filter capacitor. On each transformer, a secondary winding is switched to a load at the time the primary winding is shunted across the filter capacitor. The circuit provides dual inductor buck power stage operation while maintaining input-output isolation. Interleaved power processing provides continuous capacitance support for the output voltage produced by the power supply.

Abstract: A power density spectrum controller circuit which incorporates a programming element in conjunction with a voltage controlled oscillator and which uses spread spectrum techniques to provide a relatively clean output signal having little or no ripple, little or no noise and little or no signature while having a minimum output filtering requirement.

Abstract: A power supply topology which minimizes inductance and capacitance requirements for filtering the ripple of single or multiple output switching mode power supplies. A capacitor at the input of the power supply provides continuous support for the output signal produced by the power supply.

Abstract: A plural channel amplitude modulated station carrier signalling circuit in which an incoming call for a subscriber served by the station carrier system is sensed at the called subscriber's subscriber channel terminal circuit by synchronously detecting a signal which originates from a central office to signal the incoming call for the subscriber.