US 12,086,085 B2
Motor driver and control method thereof and motor driving system
Li-Wei Chen, Hsinchu (TW); Chung-Hsien Fu, Hsinchu (TW); and Kun-Min Chen, Hsinchu (TW)
Assigned to ANPEC ELECTRONICS CORPORATION, Hsinchu (TW)
Filed by ANPEC ELECTRONICS CORPORATION, Hsinchu (TW)
Filed on Nov. 17, 2021, as Appl. No. 17/528,239.
Claims priority of application No. 110130410 (TW), filed on Aug. 18, 2021.
Prior Publication US 2023/0058109 A1, Feb. 23, 2023
Int. Cl. H02P 6/16 (2016.01); G06F 13/32 (2006.01); H02P 6/18 (2016.01)
CPC G06F 13/32 (2013.01) [G06F 2213/40 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A motor driver, including:
a rotation information pin configured to receive a reference signal;
an analog detecting circuit electrically connected to the rotation information pin; and
a mode switching circuit electrically connected to the analog detecting circuit;
wherein the analog detecting circuit is configured to determine whether the reference signal is an analog signal, and the motor driver is maintained in a master mode when the reference signal does not belong to the analog signal;
wherein the mode switching circuit is configured to determine whether the reference signal is a noise when the reference signal is the analog signal;
wherein the mode switching circuit switches the motor driver from the master mode to a slave mode when the reference signal does not belong to the noise;
wherein the mode switching circuit includes a potential judging circuit, and the potential judging circuit is configured to determine whether a potential of the reference signal continues to remain unchanged; wherein the reference signal does not belong to the noise when the potential of the reference signal continues to remain unchanged, and the reference signal is the noise when the potential of the reference signal does not continue to remain unchanged.