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US Patent: 9998111

Power Switch Drivers with Equalizers for Paralleled Switches
Khai D. T. Ngo, Lujie Zhang, Zichen Miao
Issued: June 12, 2018


Abstract:
Capacitors connected between gate terminals of a plurality of parallel-connected power transistors are charged and discharged in each switching cycle to provide a plurality of power transistor control waveforms from a single gate driver waveform that equalize power losses/temperatures or steady-state currents among the plurality of power transistors. The capacitors are charged to different voltages by diverting current from one transistor driver by disabling another power transistor driver at different respective times in response to measured transient or steady state current or temperature or other operational parameter.

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