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A magnetically isolated gate driver for high-speed voltage sharing in series-connected MOSFETs

Anthony, Philip and McNeill, Neville and Holliday, Derrick and Grant, Duncan and Hearn, George (2011) A magnetically isolated gate driver for high-speed voltage sharing in series-connected MOSFETs. In: Proceedings of the 2011- 14th european conference on power electronics and applications (EPE 2011). IEEE, New York. ISBN 9789075815153

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Abstract

A scalable resonant gate drive circuit is described, suitable for driving series-connected MOSFETs in high-voltage, high-speed inverter applications for resistive and capacitive loads. Galvanic isolation is provided by a loop of high voltage wire, which also serves as the resonant inductor in the circuit. Fast dynamic voltage sharing is achieved by delivering equal current to each gate. A prototype is built and tested, demonstrating a 75ns switching time at 5kV using 900V MOSFETs.