A bi-directional DC-DC power converter assembly is disclosed that processes and transmits differential power in a variable manner. The converter assembly is coupled to the energy storage device and the DC link, and the converter assembly includes a first converter section coupled to the energy storage device and a second converter section coupled to the DC link and energy storage device. The converter assembly processes the first portion of the DC power output of the energy storage device when providing power to the load, provides the unprocessed second portion of the DC power output of the energy storage device to the second converter section, When providing regenerative power to the storage device, it processes the first portion of the regenerative power from the load and provides the unprocessed second portion of the regenerative power from the load to the first converter section.
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