Transcription of An isolated gate drive for Power MOSFETs and IGBTs
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An isolated gate drive for Power MOSFETs and IGBTs
APPLICATION NOTE. AN isolated gate drive FOR Power MOSFETs AND IGBTs by Bourgeois ABSTRACT 1. INTRODUCTION. Power MOSFET and igbt gate drives often isolated Power switches are often used in face isolation and high voltage constraints. motor drives, uninterruptible Power supplies The gate drive described in this paper uses and AC switches. Isolation is usually a a Printed Circuit Board based transformer requirement of safety norms and operating in combination with the memory effect of conditions when the switch voltage floats the Power MOSFET input capacitance to with respect to ground. achieve the isolation. This paper highlights a specific characteristic This transformer is a bi-directional link of the Power MOSFET which is often between the ground-referenced control IC neglected: the use of the gate input and the floating gate drive . It transfers drive capacitance as an ON state memory. It energy and signal information to the gate proposes an innovative isolated gate drive drive , provides full duty cycle range and using a pulse transformer constructed using perfect dV/dt immunity, and imposes virtually copper PCB tracks, combined with the no voltage constraint.
®APPLICATION NOTE AN ISOLATED GATE DRIVE FOR POWER MOSFETs AND IGBTs AN461/0194 1/7 by J.M. Bourgeois ABSTRACT Power MOSFET and IGBT gate …
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