TIDA-00439

Shunt Based Ground Fault Protection for Inverters Powered from 100/110Vac Supply Reference Design

TIDA-00439

Design files

Overview

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 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 +275 V supporting 100/110-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.

TIDUA39A.PDF (2595 K)

Reference design overview and verified performance test data

TIDRFH5.PDF (395 K)

Detailed schematic diagram for design layout and components

TIDRFH6.PDF (86 K)

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

TIDRFH7.PDF (68 K)

Detailed overview of design layout for component placement

TIDRFH9.ZIP (982 K)

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

TIDCAI6.ZIP (208 K)

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

TIDRFH8.PDF (1204 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Comparators

TLC372Dual General Purpose LinCMOS™ Differential Comparator

Data sheet document-pdfAcrobat PDF
Difference amplifiers

INA149High Common Mode Voltage Difference Amplifier

Data sheet document-pdfAcrobat PDF
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

Technical documentation

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Type Title Date
* Design guide Shunt-Based Ground Fault Protection for Inverters (100-/110-V AC) Design Guide (Rev. A) Jul. 14, 2015

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI SPICE-based analog simulation program

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