TIDA-00442

Shunt based Ground Fault Protection for Inverters Powered from 220Vac Supply Reference Design

TIDA-00442

Design files

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

Download ready-to-use system files to speed your design process.

TIDUA56A.PDF (4967 K)

Reference design overview and verified performance test data

TIDRFC3.PDF (477 K)

Detailed schematic diagram for design layout and components

TIDRFC4.PDF (38 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRFC5.PDF (162 K)

Detailed overview of design layout for component placement

TIDRFC7.ZIP (1257 K)

Files used for 3D models or 2D drawings of IC components

TIDCAH7.ZIP (375 K)

Design file that contains information on physical board layer of design PCB

TIDRFC6.PDF (1481 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Current sense amplifiers analog output

INA1702.7 to 60V, bi-directional, 400kHz Variable gain current sense amplifier

Data sheet document-pdfAcrobat PDF
Comparators

TLC372Dual General Purpose LinCMOS™ Differential Comparator

Data sheet document-pdfAcrobat PDF
Flyback controllers

UCC28880High voltage switcher for Non-isolated AC/DC Conversion

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA2376Dual, Precision, Low Noise, Low Quiescent Current Operational Amplifier ;

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF20333.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

LM4040Fixed voltage, 45-µA, precision micropower shunt voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* Design guide Shunt-Based Ground Fault Protection for Inverters Design Guide (Rev. A) Aug. 20, 2015

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