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

(ACTIVE) TIDA-00442

Description & Features

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Key Document

Description

The TIDA-00442 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. Current on DC positive bus is measured using INA170 which is powered by low side switched buck converter. 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 +450V supporting 220Vac 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 (6)

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
INA170  60-V, High-Side, Bi-Directional, High-Speed, Current Output Current Shunt Monitor  Current Sense Amplifiers  Sample & Buy Not Available
LM4040  Precision Micropower Shunt Voltage Reference  Voltage Reference  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
UCC28880  High Voltage Switcher for Non-isolated AC/DC Conversion  Offline and Isolated DC/DC Controllers and Converters  Sample & Buy View Design Kits & Evaluation Modules

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 TI Recommends
PDF 4967 20 Aug 2015 1,200
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 375 19 Jun 2015 159
ZIP 1257 19 Jun 2015 35
PDF 1481 19 Jun 2015 29
PDF 162 19 Jun 2015 29
PDF 38 19 Jun 2015 38
PDF 477 19 Jun 2015 336


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