High-Bandwidth Phase Current and DC-Link Voltage Sensing Reference Design for Three-Phase Inverters

(ACTIVE) TIDA-01541

Description & Features

Technical Documents

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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 (10)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1301  Precision Reinforced Isolated Amplifier for Current Sensing  Special Function Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
AMC1311  Precision Reinforced Isolated Amplifier for Voltage Sensing  Special Function Amplifiers  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 Reference  Sample & Buy Not Available
SN74LVC1G10  Single 3-Input Positive-NAND Gate  Logic  Sample & Buy Not Available
TL431B  Adjustable Precision Shunt Regulator  Voltage Reference  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  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24-V Input Voltage, 150-mA, Ultralow IQ Low-Dropout Regulators  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
UCC21520  4A/6A, 5.7 kVrms Isolated Dual Channel Gate Driver  Isolation  Sample & Buy View Design Kits & Evaluation Modules

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 1296 06 Dec 2017 46
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 439 06 Dec 2017 6
ZIP 4681 06 Dec 2017 19
PDF 3057 06 Dec 2017 11
PDF 538 06 Dec 2017 7
PDF 98 06 Dec 2017 15
PDF 803 06 Dec 2017 62
Related Tools & Software

Reference Designs (1)

Design Kits & Evaluation Modules (1)

Name Part Number Tool Type
C2000 Delfino MCUs F28379D LaunchPad Development Kit  LAUNCHXL-F28379D  Development Kits 


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