How to Connect Arduino and TLP to Drive Series IGBTs Without Pulse Transformer or Extra PSU

The discussion addresses driving series-connected IGBTs using an Arduino and TLP optocoupler drivers without employing pulse transformers or separate power supplies. The TLP series provides galvanic isolation between control and power circuits, necessitating isolated gate drive power. A recommended solution involves using small isolated DC-DC converters such as the SPU01L-15 to supply the gate drive voltage. Pulse transformers at the TLP output are discouraged due to complexity and pulse distortion. For back-to-back IGBT configurations with flyback diodes, common emitter grounding can cause short circuits; thus, isolated DC supplies per IGBT or IGBT pair are advised. A practical design example uses FOD3184 optocoupled drivers with SPU01L-15 converters, tying emitters together to the negative side of the isolated supply, including gate resistors and Schottky diodes as Miller clamps for stability. For multiple AC sources or IGBT pairs, separate isolated DC-DC converters and drivers per pair are recommended to maintain isolation and proper operation.
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