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2023-12-25
An on-Chip Integrated Current Sensing Technology for Real-Time Detection of Phase Current in BLDC Motors
By
Progress In Electromagnetics Research M, Vol. 122, 155-165, 2023
Abstract
This paper presents an on-chip integrated sensing circuit for real-time detection of phase currents in three-phase brushless direct current (BLDC) motors. The three-phase sinusoidal currents generated in the motor winding are detected by an innovative Sense FET technology, which can accurately measure the currents of high-side P-type power transistors and low-side N-type power transistors simultaneously. A dynamic matching elimination method is proposed for the detection current mismatch problem due to the large difference in aspect ratio. Using a 90 nm dual-polarized cmos-DMOS (BCD) process for design and verification, the detection circuit of the high and low sides can well follow the change of sine wave phase current of the three-phase motor, and the accuracy is above 96%. The best accuracy can reach 99.219%. The elimination effect of circuit current mismatch is obvious, and the error of the sense current can be reduced by 38.9%.
Citation
Jiayu Wen, and Liangkun Wang, "An on-Chip Integrated Current Sensing Technology for Real-Time Detection of Phase Current in BLDC Motors," Progress In Electromagnetics Research M, Vol. 122, 155-165, 2023.
doi:10.2528/PIERM23083103
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