Reference Design for Isolated Gate Driver Power Stage with Active Miller Clamp for Solar Inverters

1 января 2018

This reference design consists of a single module with a reinforced, isolated IGBT gate driver with a dedicated gate drive power supply. This compact reference design controls IGBTs in solar inverters. The design uses a reinforced isolated IGBT gate driver with built-in IGBT DESAT detection and Miller clamp protection, enabling a unipolar supply voltage for the gate drive. Open-loop, push-pull topology-based power supply for each gate driver provides flexibility in PCB routing. The push-pull transformer driver used in this TI Design operates at 420 kHz, which reduces the size of the isolation transformer, leading to a compact power supply solution. The module pinout matches TI’s solar inverter platforms for testing, but can also be used as standalone drivers.

Особенности

Suited for low to medium voltage inverters (400V AC and 690V AC) Integrated 2.5A source and 5A sink current suits driving IGBT modules with currents up to 50A Built-in Miller clamp functionality enables use of unipolar supply voltage (17V) for driving IGBT 8000-VPK reinforced isolation Very High CMTI of >100 kV/us Spread spectrum operation of transformer driver helps reduce EMI emissions