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

(ACTIVE) TIDA-00439

Description & Features

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Description

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.

Features
  • 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

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  




TI Devices (4)

Order samples, get tools and find more information on the TI products in this reference design.

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  Precision, Low Noise, Low Quiescent Current Operational Amplifier  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
REF2033  Low-Drift, Low-Power, Dual-Output VREF and VREF/2 Voltage Reference  Voltage Reference  Sample & Buy Not Available
TLC372  Dual General Purpose LinCMOS™ Differential Comparator  Amplifiers  Sample & Buy Not Available

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 2595 14 Jul 2015 457
Solution guides (1)
Title Abstract Type Size (KB) Date Views
PDF 6493 16 Nov 2016 53,321
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 208 22 Jun 2015 191
ZIP 982 22 Jun 2015 50
PDF 1204 22 Jun 2015 33
PDF 68 22 Jun 2015 28
PDF 86 22 Jun 2015 33
PDF 395 22 Jun 2015 194


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