6/15/2023 0 Comments H bridge gate driver circuitSchematic of a single gate driver (implemented on the driver board 4 times): A simple digital opto-coupler ( HCPL2601) is used to isolate the gate-drive signal from the rest of the circuit. This is enough to switch on the IGBT in a little over 100nS and off in about 300nS. It uses the MC33153Pcapable of sourcing 1 Amp and sinking 2 Amps to drive the IGBT gates. I chose to isolate all 4 drivers to get rid of any ground-noise that may arise from very high dI/dT (switching high currents really fast). The IGBT driver board has 4 fully opto-isolated gate drivers. Here’s the very simple layout for the IGBT-board: Measurements hardly showed any ringing but maybe it’s not a bad idea to add some extra snubber caps with resistors in the future. 2 Pairs of FGH50N6S2 IGBTs with RURG5060 anti-parallel diodes across them and a beefy 1uF cap on each leg. I started building an IGBT inverter using H-bridge topology.
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