Single-Ended Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors TIDA-00208 (ACTIVE)

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Key Document

Description

This design provides a 4-channel signal conditioning solution for single-ended SAR ADCs integrated into a microcontroller measuring motor current using fluxgate sensors. Also provided is an alternative measurement circuit with external SAR ADCs as well as circuits for high-speed overcurrent and earth fault detection. Proper signal conditioning improves noise immunity on critical current measurements in motor drives. This reference design can help increase the effective resolution of the analog-to-digital conversion, improving motor drive efficiency.

Features
  • Designed to measure all three phase motor currents along with DC link current through 6A Fluxgate Sensors (Scalable to 50A)
  • Single-ended Signal Conditioning Circuit to interface Fluxgate Sensors with single-ended SAR ADCs
  • Measures current and voltage through integrated SAR ADCs of TI Piccolo™  F28027 microcontroller with a provision to interface the signal conditioning circuit with External ADCs
  • Two on-board 14-bit Dual Channel Simultaneous Sampling SAR ADCs with 4-wire SPI to interface with external motor controllers
  • < 0.1% DC accuracy of Signal Conditioning Circuit
  • Overload and Earth Fault Protections for each channel with < 100ns sensing delays

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TI Devices (9)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS7253  SAR ADC, Dual, 1-MSPS, 12-Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS7853  SAR ADC, Dual, 1 MSPS, 14 Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
OPA322  20MHz Low-Noise 1.8V RRIO CMOS Operational Amplifier With Shutdown  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA4322  20MHz, Low Noise, 1.8V, RRIO, CMOS 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 references  Sample & Buy View Design Kits & Evaluation Modules
REF5025  3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TLC372  Dual General Purpose LinCMOS™ Differential Comparator  Amplifiers  Sample & Buy Not Available
TMS320F28027  Piccolo™ 32-bit MCU with 60 MHz, 64 KB Flash  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36-V, 1-A, 4.17-μVRMS, RF low-dropout (LDO) voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS7253 Download
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ADS7853 Download
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OPA322 Download -
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OPA4322 Download
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REF2033 Download -
REF5025 Download Download
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TLC372 Download -
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TMS320F28027 Download -
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TPS7A47 Download -

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 6399 30 Oct 2014
White papers (1)
Title Type Size (KB) Date
PDF 841 05 Nov 2018
Design files (6)
Title Type Size (KB) Date
ZIP 342 11 Nov 2014
ZIP 2345 11 Nov 2014
PDF 2911 11 Nov 2014
PDF 603 11 Nov 2014
PDF 189 11 Nov 2014
PDF 884 11 Nov 2014

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