TIDA-00442
適用於由 220Vac 電源供電之逆變器的分流架構接地故障防護參考設計
TIDA-00442
概覽
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.
特點
- 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
已開發完全組裝的電路板，僅供測試與性能驗證，且為非賣品。
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| 類型 | 標題 | 下載最新的英文版本 | 日期 | |||
|---|---|---|---|---|---|---|
| * | 設計指南 | Shunt-Based Ground Fault Protection for Inverters Design Guide (Rev. A) | 2015/8/20 |