Bootstrap circuitry for an IGBT

摘要

A bootstrap circuit provides a gate-emitter voltage to the high-side IGBT of a half-bridge IGBT arrangement. The bootstrap circuit includes a buck-boost circuit for providing a negative gate-emitter voltage for turning the high-side IGBT off.

主权项

1. A bootstrap circuit for providing a drive voltage to a high-side transistor of a half-bridge arrangement, the bootstrap circuit comprising a buck-boost circuit configured to provide a negative drive voltage for turning the high-side transistor off via a negative supply node, wherein the buck-boost circuit comprises a first capacitor coupled between an output node of the half-bridge arrangement and the negative supply node, an inductor having a first terminal coupled to the output node of the half-bridge arrangement, and a diode coupled between a second terminal of the inductor and the negative supply node.