Shunt Based Ground Fault Protection for Inverters Powered from 100/110Vac Supply Reference Design
Description
This is a reference design for detecting ground fault in inverter-based drives. Inverter current is measured on both DC-positive and DC-negative bus using shunt resistors. INA149 current sense amplifier having a common-mode voltage range of +275 V is used to measure current on DC-positive bus. Current on DC-negative bus is sensed using precision operational amplifiers. 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 +275 V supporting 100/110-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
- String inverter
- AC drive power stage module
- AC-input BLDC motor drive
- Off-highway vehicles control
- Servo drive power stage module
- Servo drive power supply module
- Central inverter
- Off-highway vehicles sensor
- Off-highway vehicles electric drive
- HVAC motor control
Product Categories
- Amplifiers
| Download the bill of materials for TIDA-00439 | Download |
Test Data
Get results faster with test and simulation data that's been verified.
Download the test file for TIDA-00439| Title | Updated | Type | Size (KB) | |
|---|---|---|---|---|
| TIDA-00439 Gerber | 22 Jun 2015 | ZIP | 208 | |
| TIDA-00439 CAD Files | 22 Jun 2015 | ZIP | 982 | |
| TIDA-00439 PCB | 22 Jun 2015 | 1204 | ||
| TIDA-00439 Assembly Drawing | 22 Jun 2015 | 68 | ||
| TIDA-00439 BOM | 22 Jun 2015 | 86 | ||
| TIDA-00439 Schematic | 22 Jun 2015 | 395 |