MULTI-LEVEL DC-DC CONVERTER WITH GALVANIC ISOLATION AND ADAPTIVE CONVERSION RATIO

摘要

A multi-level DC-DC converter includes an input side to receive a DC power having an input voltage and current, an output side to provide power to a load at a desired output voltage and current, and a plurality of transformer-isolated DC-DC converters connected between the input and output sides, with the transformer-isolated DC-DC converters being connected in series on one side and connected in parallel on another side. Each of the transformer isolated DC-DC converters further includes a power transformer having a primary winding and a secondary winding, and a plurality of switching devices each selectively operable in one of an On state and an Off state. Operating the switching devices in a complementary On state and Off state alternately at a controlled switching frequency provides for engaging the transformer isolated DC-DC converter and operating the switching devices in a simultaneously On state bypasses the transformer isolated DC-DC converter.

主权项

1. A multi-level DC-DC converter comprising:
an input side to receive a DC power having an input voltage and current; an ouput side to provide power to a load at a desired output voltage and current; a plurality of tranformer-isolated DC-DC converters connected between the input side and the output side, with the plurality of tranformer-isolated DC-DC converters being connected in series on one side and connected in parallel on another side; and a controller in operable communication with each of the plurality of tranformer-isolated DC-DC converters to control operation thereof; wherein each of the plurality of tranformer isolated DC-DC converters comprises:
a power transformer comprising a primary winding arranged in an input side converter stage on the input side and a secondary winding arranged in an output side converter stage on the output side; anda plurality of switching devices each selectively operable, via the controller, in one of an On state and an Off state to control voltage and current flow therethrough;wherein the plurality of switching devices is operated at a substantially fixed frequency and duty ratio by the controller.