36-V, 1-kW, 99% Efficient, 18-cm2 Power Stage Reference Design for Three-Phase BLDC Motors
Created: Nov 05, 2018
This 1kW power stage reference design achieves 99% efficiency for a three-phase, 36V brushless DC (BLDC) motor used in industrial applications such as power tools that operate from a 10-cell Li-ion battery. The design demonstrates the smallest inverter power stage for this power levels, implementing sensor-based trapezoidal control and supports 25ARMS continuous (60A peak for 2 seconds, 100A peak for 400 milliseconds) winding current. The design's MOSFET power block and current controlled gate driver helps clean MOSFET switching and lowest EMI due to slew rate control and low parasitic inductance.
36-V/1-kW, 99% Efficient, 18-cm2 Power Stage Reference Design for Three-Phase BLDC Motors
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