Shunt based Ground Fault Protection for Inverters Powered from 220Vac Supply Reference Design
Description
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 protectionRated 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 drivesCalibrated high-side and low-side measurement error over operating temperature range of -10 °C to 55 °C 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
Applications
- AC drive power stage module
- AC-input BLDC motor drive
- Off-highway vehicles control
- Servo drive power stage module
- Servo drive power supply module
- Off-highway vehicles sensor
- Off-highway vehicles electric drive
- Door operator drive control
- HVAC motor control
Product Categories
- Amplifiers
| Download the bill of materials for TIDA-00442 | Download |
Test Data
Get results faster with test and simulation data that's been verified.
Download the test file for TIDA-00442| Title | Updated | Type | Size (KB) | |
|---|---|---|---|---|
| TIDA-00442 Gerber | 19 Jun 2015 | ZIP | 375 | |
| TIDA-00442 CAD Files | 19 Jun 2015 | ZIP | 1257 | |
| TIDA-00442 PCB | 19 Jun 2015 | 1481 | ||
| TIDA-00442 Assembly Drawing | 19 Jun 2015 | 162 | ||
| TIDA-00442 BOM | 19 Jun 2015 | 38 | ||
| TIDA-00442 Schematic | 19 Jun 2015 | 477 |