Differential Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors

(ACTIVE) TIDA-00201

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Key Document

Description

This design provides a 4-channel signal conditioning solution for differential ADCs integrated into a microcontroller measuring motor current using fluxgate sensors. Also provided is an alternative measurement circuit with external differential SAR ADCs as well as circuits for high-speed overcurrent and earth fault detection. Proper differential 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)
  • Differential Signal Conditioning Circuit to interface Fluxgate Sensors with differential ADCs
  • Measures current and voltage through integrated differential ADCs of TI Delfino™  F2837xD 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 channels with < 100ns sensing delays

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Bill of Materials (BOM)

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TI Devices (18)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS7254  SAR ADC, Dual, 1 MSPS, 12 Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS7854  SAR ADC, Dual, 1 MSPS, 14 Bit, Simultaneous Sampling  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
DRV401  Fluxgate Magnetic Sensor Signal Conditioning IC for Closed-Loop Applications  Specialty sensors  Sample & Buy Not Available
DRV401-EP  Enhanced Product, Fluxgate Magnetic Sensor Signal Conditioning IC for Closed-Loop Applications  Specialty sensors  Sample & Buy Not Available
DRV401-Q1  Automotive, Fluxgate Magnetic Sensor Signal Conditioning IC for Closed-Loop Applications  Specialty sensors  Sample & Buy Not Available
OPA322  20MHz Low-Noise 1.8V RRIO CMOS Operational Amplifier With Shutdown  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF3025  2.5V 50ppm/Degrees C, 50uA in SOT23-3 Series (Bandgap) Voltage Reference  Voltage references  Sample & Buy Not Available
REF5025  3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
THS4531  Ultra low power 0.25mA, RRO, fully differential amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TLC372  Dual General Purpose LinCMOS™ Differential Comparator  Amplifiers  Sample & Buy Not Available
TLV700  200mA Low-Iq Low-Dropout (LDO) Regulator for Portables  Power management  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28374S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Not Available View Design Kits & Evaluation Modules
TMS320F28375S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Not Available View Design Kits & Evaluation Modules
TMS320F28376S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Not Available View Design Kits & Evaluation Modules
TMS320F28377D  Dual-Core Delfino Microcontroller  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28377S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28379D  Dual-Core Delfino Microcontroller  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36V, 1A, 4.17μVRMS, 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)
ADS7254 Download Download
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ADS7854 Download
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DRV401 Download Download
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DRV401-EP Download Download
DRV401-Q1 Download
OPA322 Download Download
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REF3025 Download Download
REF5025 Download Download
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THS4531 Download
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TLC372 Download Download
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TLV700 Download Download
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TMS320F28374S Download Download
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TMS320F28375S Download
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TMS320F28376S Download Download
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TMS320F28377D Download Download
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TMS320F28377S Download Download
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TMS320F28379D Download Download
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TPS7A47 Download Download

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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 6502 24 Oct 2014 83
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1523 03 Nov 2014 16
ZIP 2429 03 Nov 2014 10
PDF 3920 03 Nov 2014 12
PDF 735 03 Nov 2014 12
PDF 188 03 Nov 2014 22
PDF 1053 03 Nov 2014 69

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