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Reference Designs

Cost optimized: < 1% accurate current sensing and protection for 3-phase inverter reference design

Texas Instruments

This reference design demonstrates a cost optimized three-phase inverter leg (low-side shunt) current sensing solution with high accuracy and faster response for sensorless 2-shunt or 3-shunt field oriented control (FOC). This reference design demonstrates inverter leg current sensing with full swing response settling time close to 1-µs and accuracy error less than 1%. The design also shows very good noise rejection even with high power IGBTs switching nearby. The design implements overcurrent protection fully in hardware with less than 1.5-µs total response time.

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Features

Current sensing with Overcurrent protection fully implemented in hardware with fast response time Positive and negative overcurrent protection in all the three inverter legs by using only two comparatorsLow cost and accurate current sensing for sensorless FOC with dual and triple shunt topologies to minimize torque ripple and audible noise in motor drives