Current-Transformer Based Gate-Drive Power Supply with Reinforced Isolation

Abstract

At t0, the half-bridge high-side (HS) switch is turned on. During this mode, the input of the resonant tank is connected to the DC input. The resonant tank outputs a current-source to the transformer, which outputs a positive current to the rectifier. 2) Mode 2(Dead-time, t1 < t < t2) At t1, the HS switch is turned off. The output capacitors of the HS-switch Coss_H start to be charged while that of the low-side (LS) switch Coss_L is discharged for part of the dead-time duration. This mode ends when the capacitances are fully charged or discharged.

Optimized Design of Multi-MHz Frequency Isolated Auxiliary Power Supply for Gate Drivers in Medium-Voltage Converters

“…Within resonant converter topologies, the seriesseries compensated (SS) resonant converter structure is usually preferred due to its simple design. An established architecture consists of a single converter feeding multiple loads using a single primary winding that goes through several toroidal magnetic cores on which the secondary turns are winded and supplies the loads separately [12]- [14]. The reported coupling capacitance is in the range of 1-2 pF [13], which is very low.…”