Gate Driver for Electric Motorcycle (MOSFET)

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http://forum.allaboutcircuits.com – Evening gents, I am currently trying to design a suitable gate driver circuit for a half bridge circuit for an electric motorcycle. The half bridge will be composed of MOSFETs and FWD (in either a module or made from discrete components) and a battery bank of ~55V and operating with switching frequency of 15-20kHz. I've seen how gate drive chips can be used with charge pump and bootstrap capacitor circuitry in order to drive the high side switch, but I've also heard that it can be done with a DC-DC converter. Can someone explain to me how this done, or point me towards a good reference? A (Embedded)