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Design of a Two-Switch Flyback Power Supply Using 1.7 kV SiC Devices for Ultra-Wide Input-Voltage Range Applications
Year: 2017 | Author: Gabriele | Paper: D3.5
Fig. 1. Two-switch flyback schematic and gate drivers implementation
The two-switch flyback topology provides the best trade-off in terms of performance and complexity among other topologies like LLC or full-bridge. With reference to Fig. 1, the benefit of this topology is that the over-voltages on the power switches are clamped to the dc bus by diodes D1 and D2, thus allowing the use of power switches with a breakdown voltage of 1.5 kV. Since this circuit topology is basically hard-switching, SiC MOSFETs (CREE C2M-1000170D 1.7 kV/5 A) have been chosen to reduce the losses of Q1 and Q2. Another feature of the two-switch flyback converter is that during the clamping period the leakage energy of the transformer is returned back to the source, effectively eliminating the need for dissipative snubber circuits.
Fig. 2. Picture of PEBB prototype (a) top view (b) side view
