Optimal Battery Current Waveform for Bidirectional PHEV Battery Charger

摘要

The present invention provides a battery charger and battery charging method controlled with a charging waveform input of an AC-DC switching circuit to a DC link and a DC-DC stage converter for outputting a regulated DC voltage. The method determining the charging waveform comprising the steps of selecting a Pulse Width Modulation (PWM) zero-off charging waveform signal input to the AC-DC switching circuit and calculating a ripple power at the DC link based on the signal input power and output power of the regulated DC voltage output.

主权项

1. A battery charger including a power converter for outputting a DC voltage, comprising:
a Full Bridge (FB) AC-DC switching circuit comprising a first plurality of switches for receiving an AC source and a DC link capacitor, the first plurality of switches providing an AC source component signal at double line frequency to the DC link capacitor;
a Dual Active Bridge (DAB) converter comprising second switching circuits including a second plurality of switches; andan interface circuit for receiving a waveform responsive to the AC source for driving one or more of the second plurality of switches of at least said second switching circuit for a reduced DAB converter loss with a reduced DC link capacitor.