Apple Inc.
Frequency Doubling Resonant Converter

Abstract:

A frequency doubling resonant converter can include a dual half bridge resonant converter configured to receive an input DC voltage and convert it to an frequency doubled AC voltage having a frequency twice the switching frequency of the dual half bridge resonant converter. The converter can further include a step down transformer configured to reduce the frequency doubled AC voltage to a stepped down AC voltage. The converter can further include a rectifier configured to convert the stepped down AC voltage into a DC output voltage for delivery to a load. The converter may optionally include an interphase transformer coupled between the step down transformer and the rectifier and configured to increase an output current of the converter. The frequency doubling resonant converter may be configured, for example, to double an output current received from the step down transformer.