TIDA-00208

Single-Ended Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors

TIDA-00208

Design files

Overview

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

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU583.PDF (6399 K)

Reference design overview and verified performance test data

TIDRBT3.PDF (884 K)

Detailed schematic diagram for design layout and components

TIDRBT4.PDF (189 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRBT5.PDF (603 K)

Detailed overview of design layout for component placement

TIDRBT7.ZIP (2345 K)

Files used for 3D models or 2D drawings of IC components

TIDC760.ZIP (342 K)

Design file that contains information on physical board layer of design PCB

TIDRBT6.PDF (2911 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

General-purpose op amps

OPA322Single, 5.5-V, 20-MHz, 65-mA output current, low noise (8.5-nV/√Hz) operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

OPA4322Quad, 5.5-V, 20-MHz, 65-mA output current, low noise (8.5-nV/√Hz), RRIO operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
C2000 real-time microcontrollers

TMS320F28027C2000™ 32-bit MCU with 60 MHz, 64 KB flash

Data sheet document-pdfAcrobat PDF
C2000 real-time microcontrollers

TMS320F28027-Q1Automotive C2000™ 32-bit MCU with 60 MHz, 64 KB flash

Data sheet document-pdfAcrobat PDF
Comparators

TLC372Dual General Purpose LinCMOS™ Differential Comparator

Data sheet document-pdfAcrobat PDF
Linear & low-dropout (LDO) regulators

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS725312 Bit, 1 MSPS, Dual, Simultaneous Sampling Single Ended / Pseudo-Differential SAR ADC

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS7853SAR ADC, dual, single-ended input, 1 MSPS, 14-bit, simultaneous sampling

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF20333.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF50252.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Single-Ended Signal Conditioning Circuit for Current and Voltage Measurement Oct. 30, 2014
White paper Piccolo™ C2000™ MCUs enable the next generation of low-cost, dual-axis servo dri (Rev. A) Jul. 13, 2020

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