High-Bandwidth Phase Current and DC-Link Voltage Sensing Reference Design for Three-Phase Inverters
TIDA-01541
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Key Document

Description

The TIDA-01541 reference design reduces system cost and enables a compact design for isolated phase current and DC link voltage measurement in three-phase inverters, while achieving high bandwidth and sensing accuracy. The output of the isolated amplifiers is interfaced to the internal ADC of the MCU using a differential-to-single-ended circuit. Use of isolated amplifiers enables using SAR ADC within MCU, thereby lowering system cost without any trade-offs on the current sensing. The 8-pin package reduces board form factor. High bandwidth of the isolated amplifier enables protection of IGBTs within 3.5 µs and high-performance specifications enable high-accuracy current and voltage measurements. The DC link voltage measurement is done with a high input impedance to avoid effect of source impedance due to high-voltage potential divider to improve accuracy.

Features
  • Reinforced, isolated inverter suited for 400-V to 1200-V DC-link drives rated up to 10 kW
  • Reinforced, isolated amplifiers with high bandwidth (> 200 kHz) enable low latency current sensing and fast overcurrent detection (< 3 µs) to protect power stage
  • Reinforced, isolated amplifier with high impedance input optimized for precision sensing of high-impedance nodes like DC-link voltage, ±1% error for DC-link voltage sensing accuracy from 0-V to 1026-V DC
  • Calibrated current measurement error of ±0.5% over ±50-A FSR and across temperature range from –25°C to +85°C
  • Reinforced, isolated amplifier with low power consumption allows powering from gate drivers bootstrap capacitor simple LDO
  • Protection against DC bus undervoltage, overvoltage, overload, ground fault, and overtemperature

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TI Devices (11)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1301  ±250 mV-Input Precision Reinforced Isolated Amplifier for Current Sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
AMC1311  2-V input, reinforced isolated amplifier with high CMTI for voltage sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
OPA320  Precision, Zero-Crossover, 20MHz, 0.9pA Ib, 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
SN74LVC1G10  Single 3-Input Positive-NAND Gate  Gate  Sample & Buy View Design Kits & Evaluation Modules
TL431  Adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TLC372  Dual General Purpose LinCMOS™ Differential Comparator  Amplifiers  Sample & Buy Not Available
TLV1117  Single Output LDO, 800mA, Fixed and Adj., Internal Current limit, Thermal Overload Protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24V Input Voltage, 150mA, Ultra-Low-Iq Low-Dropout (LDO) Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC21520  4A/6A, 5.7 kVrms Isolated Dual Channel Gate Driver  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules
UCC21540  Reinforced Isolation Dual-Channel Gate Driver With 3.3mm Channel-to-Channel Spacing Option  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AMC1301 Download -
AMC1311 Download Download
OPA320 Download Download
REF2033 Download -
SN74LVC1G10 Download Download
Download Download
Download Download
Download Download
Download -
TL431 Download Download
Download Download
Download -
Download Download
Download Download
Download Download
Download Download
Download -
Download Download
TLC372 Download Download
Download Download
Download -
Download Download
TLV1117 Download Download
Download
Download -
Download Download
Download Download
Download -
TLV704 Download Download
UCC21520 Download Download
UCC21540 Download
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Technical Documents

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 1364 13 Apr 2018
Design files (6)
Title Type Size (KB) Date
PDF 590 19 Mar 2018
ZIP 5143 19 Mar 2018
ZIP 439 06 Dec 2017
PDF 3057 06 Dec 2017
PDF 538 06 Dec 2017
PDF 98 06 Dec 2017
Related Tools & Software

Reference Designs  ( 1 )

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
C2000 Delfino MCU F28379D LaunchPad™ development kit  LAUNCHXL-F28379D  Development Kits 

Models (3)

Title Category Type Size (KB) Date Views
TIDA-01541 Temperature Sensing Simulation TINA-TI Reference Design ZIP 64 KB 05 Mar 2018
TIDA-01541 DC Link Voltage Sensing Simulation TINA-TI Reference Design ZIP 63 KB 05 Mar 2018
TIDA-01541 Current Sensing Simulation TINA-TI Reference Design ZIP 129 KB 05 Mar 2018

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