TIDA-00442
Shunt based Ground Fault Protection for Inverters Powered from 220Vac Supply Reference Design
TIDA-00442
Overview
This referene design detects ground fault in inverter-based drives. Inverter current is measured on both DC-positive and DC-negative bus using shunt resistors. Current on DC-positive bus is measured using INA170 which is powered by a low-side switched buck converter. Current on DC-negative bus is sensed using precision op amps. The difference between the two measured currents is compared against a fixed threshold to determine the ground-fault condition using high-speed comparators.
Features
- Shunt-based current sensing for inverter control and protection
- Rated to measure DC-link current of +/-20 APK (design tested for +/-5 A)
- High-side current sense circuit with high common-mode voltage of +450 V supporting 220-Vac mains powered drives
- Calibrated high-side and low-side measurement error over operating temperature range of -10°C to 55°C < 1.5%
- Ground fault (minimum fault-current detection of 300 mA, detection time of less than 50 µs)
- Designed to be interfaced with built-in 3.3-V ADC of MCU
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
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Reference design overview and verified performance test data
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Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Shunt-Based Ground Fault Protection for Inverters Design Guide (Rev. A) | Aug. 20, 2015 |
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