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


The TIDA-00439 TI design provides a reference solution 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 common mode voltage range of +275V is being used to measure current on DC Positive bus. Current on DC negative bus is sensed using precision opamp’s. The difference between the two measured currents is compared against a fixed threshold to determine the ground fault condition using high speed comparators.

  • Shunt based current sensing for inverter control and protection
  • Rated to measure DC Link current of +/-20APK (Design tested for +/-5A)
  • High side current sense circuit with high common mode voltage of +275V supporting 100/110Vac 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 300mA, Detection time of less than 50µs)
  • Designed to be interfaced with built-in 3.3V ADC of MCU

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA149  High Common Mode Voltage Difference Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
OPA2376  Dual, Precision, Low Noise, Low Quiescent Current Operational Amplifier   Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF2033  3.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TLC372  Dual General Purpose LinCMOS™ Differential Comparator  Amplifiers  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA149 Download Download
OPA2376 Download Download
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REF2033 Download -
TLC372 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2595 14 Jul 2015
Design files (6)
Title Type Size (KB) Date
ZIP 208 22 Jun 2015
ZIP 982 22 Jun 2015
PDF 1204 22 Jun 2015
PDF 68 22 Jun 2015
PDF 86 22 Jun 2015
PDF 395 22 Jun 2015
Related Tools & Software

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tool 

Models (2)

Title Category Type Size (KB) Date Views
TIDA-00439 Simulation of Normal Operation TINA-TI Reference Design ZIP 111 KB 14 Jun 2018
TIDA-00439 Simulation of Ground Fault Detection TINA-TI Reference Design ZIP 113 KB 14 Jun 2018

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