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Three-Phase Inverter Reference Design Using Gate Driver With Built-in Dead Time Insertion

Texas Instruments

The TIDA-01540 reference design reduces system cost and enables a compact design for a reinforced isolated 10kW three phase inverter. A lower system cost and compact form factor is achieved by using a dual gate driver in a single package and bootstrap configuration to generate floating voltages for the gate drive power supply. The dual gate driver UCC21520 has a built-in dead time insertion configurable by a resistor option. The unique dead time insertion protects the three phase inverter against shoot-through due to overlap of the input PWM signal. System reliability is improved by implementing protection against overload: short circuit: ground fault: DC bus undervoltage and overvoltage: and IGBT module overtemperature in hardware.

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Features

Reinforced: isolated inverter suited for 200-V to 690-V AC drives rated up to 10 kWReinforced: isolated: half-bridge gate driver have excellent propagation delay matching to enable smaller dead time (lower distortions and lower power losses)Integrated interlock: dead time: and insertion protects IGBT when PWM input signals overlap (programmable dead time)STO and fail-safe measure against primary-side logic failures: is more reliable with a disable signal that simultaneously shuts down both high and low-side gate drive outputs to IGBTsUCC21520 has high CMTI (100 kV/µs) for high robustness against switching transientsUCC21520 rejects input pulses and noise transients shorter than 5 ns to avoid false turnon or turnoff of IGBTs