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Current Sensing with <1-us Settling for 1-, 2- & 3-Shunt FOC in 3-Phase Inverter Reference Design
TIDA-00778
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
See the Important Notice and Disclaimer covering reference designs and other TI resources.
Key Document
- Current Sensing With <1-µs Settling for 1-, 2- & 3-shunt FOC in 3-Phase Inverter
(PDF 2980 KB)
09 Mar 2017
Description
The TIDA-00778 reference design demonstrates fast and accurate current sensing for a three-phase motor driven with sensorless field-oriented control (FOC). Drives with lower audible noise require faster andaccurate current sensing. The most common low-cost current-sensing methods use a single shunt on the DC bus return path or two to three shunts in the inverter legs. The major challenge in motor control is to enable accurate current sensing even with the lowest active vector duration. TIDA-00778 demonstrates sub-microsecond settling and accurate current sensing in such scenarios. The referencedesign is applicable to major appliances,especially in compressor motors, and the inverter power stage can work up to 2 kW.
Features
- Fast and accurate current sensing for sensorless FOC with single-, dual-, and triple-shunt topologies to minimize torque ripple and audible noise in motor drives
- Single-shunt current sensing with minimum settling time and gate driver with lowest propagation delay enable active voltage vector duration < 1 μs
- Single-shunt DC bus current sensing with < 0.15% calibrated accuracy
- Dual- and triple-shunt current sensing with < 1.5-μs settling time and < 0.04% calibrated accuracy enabling accurate current sensing at extreme duty cycles
- Overcurrent detection with response time < 1.5 μs
- Input voltage 270-V to 390-V DC (rectified from 195-V to 265-V AC)
See the Important Notice and Disclaimer covering reference designs and other TI resources.
