Abstract: In one embodiment the invention describes an integrated magnetic structure, for use in a transformer coupled buck and/or boost converter, comprising a core having at least one leg portion and at least one phase winding split into two sub-windings, said two sub-windings are wound around the core and adapted to function as a single phase of a transformer wherein the core is fabricated from two C and two T ferrite or magnetic sections and adapted to cooperate with each other to form a CCTT shaped integrated magnetic structure.

Abstract: An inductive charger includes a rectifier that can be connected to both single- and three-phase power sources. The rectifier includes first, second and third legs that include first and second diodes. Alternately, the third leg includes first and second silicon-controlled rectifiers. A capacitor is connected across an output of the rectifier. An inverter is connected to the rectifier and the capacitor and includes a plurality of switching circuits. A series resonant tank circuit is connected to an output of the inverter. A charge coupler and an inductive inlet include a transformer and a parallel resonant tank circuit for coupling energy to a load. A controller is connected to the rectifier and the inverter. The controller generates drive signals for controlling the switching circuits. The inductive charger is capable of providing approximately 0.99 power factor from single-phase and 0.91 power factor at twice the output power from three-phase power sources.

Abstract: The present invention comprises a power-factor-corrected, single-stage inductive charger that may be used to charge a load, such as batteries of an electric vehicle. The inductive charger system is a single stage inductive charger compatible with the Society of Automotive Engineers inductive charging standard SAE J-1773. The single stage power processing provided by the inductive charger system includes both power factor correction and output power regulation using a relatively low parts count. The inductive charger system is fully soft switched over the line voltage and power range, resulting in high efficiency. The inductive charger system uses the current source operation of a series-parallel resonant converter feeding the SAE J- 1773 interface to provide voltage gain for power factor correction over the full AC line cycle. The operating frequency of the converter is modulated around the current-source frequency to regulate the output power from zero to full load.

Abstract: AC isolation apparatus, such as is provided by an AC isolation capacitor disposed between unexposed and exposed portions of the chassis of a charging system or an electric vehicle. The AC isolation apparatus or capacitor provides a high impedance at 50/60 Hertz between the electric vehicle and the charging system, thus isolating their respective chassis grounds.

Abstract: A full bridge DC-DC series-resonant power converter is operated at a constant switching frequency using a phase delay between the transistor legs of the bridge to control the output voltage. All power semiconductor devices switch on and switch off at approximately zero volts while operating at a constant switching frequency which is above the resonant frequency of the resonant tank circuit. Zero-voltage switching increases the efficiency of the power converter and allows high frequency operation which minimizes component volumes. Constant frequency operation simplifies design of the magnetic components, confines the EMI spectrum to known frequencies and simplifies EMI design, and reduces the voltage and current excursions and thus reduces the peak component stress.