Wireless power charging using point of load controlled high frequency power converters

摘要

An apparatus for wirelessly charging a battery of an electric vehicle is provided with a point of load control. The apparatus includes a base unit for generating a direct current (DC) voltage. The base unit is regulated by a power level controller. One or more point of load converters can be connected to the base unit by a conductor, with each point of load converter comprising a control signal generator that transmits a signal to the power level controller. The output power level of the DC voltage provided by the base unit is controlled by power level controller such that the power level is sufficient to power all active load converters when commanded to do so by any of the active controllers, without generating excessive power that may be otherwise wasted.

主权项

1. An apparatus for wireless power transfer, said apparatus comprising:
an active front end unit configured to provide a unipolar output voltage; a buck-boost converter configured to receive said unipolar output voltage and to generate a DC supply voltage to a plurality of DC power transmission cables; an output power controller configured to control an output power level provided by said DC supply voltage to said plurality of DC power transmission cables; and a plurality of point-of-load converters, each of the plurality of point-of-load converters comprises a high frequency alternating current (AC) current generation circuit that is respectively connected to one of said plurality of DC power transmission cable and is configured to provide AC current through at least one power transmission circuit, wherein each of said at least one power transmission circuit comprises a primary coil for wireless power transfer, the output power controller being further configured to control the AC current provided by each of the plurality of point-of-load converters based on a determined load level of electrical power to be wirelessly transmitted from the at least one power transmission circuit in each of the respective point-of-load converters, wherein the output power level provided by said DC supply voltage is determined based on an expected power demand of all of the plurality of point-of-load converters.