Patent ID: 8188708

Claim:
A daisy chained battery charging system for charging a plurality of vehicle batteries, the charging system comprising: a plurality of power supplies, each power supply electrically coupled in a daisy chain configuration and each power supply sharing a common input power, each power supply including a high-frequency transformer, and each power supply configured to deliver a DC battery charging power to charge at least one vehicle battery; each power supply including a wind tunnel, the wind tunnel formed by a first end and a second end coupled to a base, an L-shaped assembly coupled to at least one of the first end, the second end, and the base, and a side coupled to at least one of the first end, the second end, and the base; the high-frequency transformer positioned within the wind tunnel of each power supply including: a bobbin including an elongated top and bottom surfaces and first and second substantially semi-circular end surfaces connecting the top surface with the bottom surface to form an elongated first coil winding surface having a central axis; a first coil wound around the first coil winding surface; and a second coil magnetically coupled to the first coil and wound thereto.