TIDA-01541
High-Bandwidth Phase Current and DC-Link Voltage Sensing Reference Design for Three-Phase Inverters
TIDA-01541
Overview
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
Industrial
- Contractor circuit
- DC-fed servo power stage
- Hydraulic/Pneumatic actuator drive
- IGBT-based servo power stage
- IPM-based servo power stage
- Isolated AC drive power stage
- Multi-axis servo drive
- Multi-axis servo power stage
- Railway auxiliary power systems
- Railway electric propulsion system
- Servo drive active frontend
- Single-axis servo drive
- Three Phase String Inverter
- Traction drive
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Products
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Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | High-Bandwidth Phase Current and DC-Link Voltage Sensing Reference Design (Rev. A) | Apr. 13, 2018 |
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