TIDA-00201 Reference Design

Texas Instruments

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

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 ADCsMeasures current and voltage through integrated differential ADCs of TI Delfino™  F2837xD microcontroller with a provision to interface the signal conditioning circuit with External ADCsTwo on-board 14-bit Dual Channel Simultaneous Sampling SAR ADCs with 4-wire SPI to interface with external motor controllersOverload and Earth Fault Protections for each channels with
Applications
  • AC drive power stage module
  • Motor diagnostics & monitoring
  • Servo drive power stage module
  • Servo drive power supply module
  • Railway auxiliary power
  • Railway electric propulsion
  • Condition monitoring sensor
  • Substation automation
  • Robot servo drive
Product Categories
  • Amplifiers

Parts

Part Number Name Companion Part
ADS7254 ADS7254 Buy Datasheet
ADS7854 ADS7854 Buy Datasheet
OPA322 OPA322 Buy Datasheet
REF3025 REF3025 Buy Datasheet
REF5025 REF5025 Buy Datasheet
THS4531 THS4531 Buy Datasheet
TLC372 TLC372 Buy Datasheet
TMS320F28377D TMS320F28377D Buy Datasheet

Bill Of Materials

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Schematic

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Test Data

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Other Documents

Title Updated Type Size (KB)
TIDA-00201 Gerber 03 Nov 2014 ZIP 1523
TIDA-00201 CAD Files 03 Nov 2014 ZIP 2429
TIDA-00201 PCB 03 Nov 2014 PDF 3920
TIDA-00201 Assembly Drawing 03 Nov 2014 PDF 735
TIDA-00201 BOM 03 Nov 2014 PDF 188
TIDA-00201 Schematic and Block Diagram 03 Nov 2014 PDF 1053