TIDA-010023
Cost optimized, < 1% accurate current sensing and protection for 3-phase inverter reference design
TIDA-010023
Overview
This reference design demonstrates a cost optimized three-phase inverter leg (low-side shunt) current sensing solution with high accuracy and faster response for sensorless 2-shunt or 3-shunt field oriented control (FOC). This reference design demonstrates inverter leg current sensing with full swing response settling time close to 1-µs and accuracy error less than 1%. The design also shows very good noise rejection even with high power IGBTs switching nearby. The design implements overcurrent protection fully in hardware with less than 1.5-µs total response time.
Features
- Current sensing with < 1.25 µs settling time and < 1% calibrated accuracy enabling accurate current sensing
- Overcurrent protection fully implemented in hardware with fast response time < 1.5 µs
- Positive and negative overcurrent protection in all the three inverter legs by using only two comparators
- Low cost and accurate current sensing for sensorless FOC with dual and triple shunt topologies to minimize torque ripple and audible noise in motor drives
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.
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
Includes TI products in the design and potential alternatives.
TMS320F28027F — C2000™ 32-bit MCU with 60 MHz, 64 KB flash, InstaSPIN-FOC
Data sheet: PDFTMS320F28027F-Q1 — Automotive C2000™ 32-bit MCU with 60 MHz, 64 KB flash, InstaSPIN-FOC
Data sheet: PDFSN74AHC367 — 6-ch, 2-V to 5.5-V buffers with 3-state outputs
Data sheet: PDF | HTMLStart development
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Cost Optimized, < 1% Accurate Current Sensing and Protection for 3-Phase Inverte | Nov. 01, 2018 |
Related design resources
Reference designs
REFERENCE DESIGN
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