公开(公告)号：US10738790B2

公开(公告)日：2020-08-11

申请号：US15876446

申请日：2018-01-22

Applicant: Johnson Electric S.A.

Inventor： Chiping Sun ,  Shinghin Yeung ,  Haibo Jiang ,  Yunlong Jiang ,  Guodong Liu ,  Zhiwang Chen

IPC: G05B6/02 ,  F04D27/00 ,  F04D25/06

Abstract: A motor-driven fan device includes a motor, a processor, a storage with a lookup table stored therein, and a speed detection unit. The processor queries the lookup table or calculates to acquire the target driving voltage and a corresponding target rotating speed of the motor. When the rotating speed difference is not within the range of the preset rotating speed difference, the processor repeatedly adds a gain value to the target driving voltage to acquire a new target driving voltage, acquires the actual rotating speed and the target rotating speed, and determines whether the rotating speed difference is within the range of the preset rotating speed difference. The processor maintains the operation of the motor at the target rotating speed at that point by using the constant speed control method when the absolute value of rotating speed difference is within the range of the preset rotating speed difference.

公开(公告)号：US10566924B2

公开(公告)日：2020-02-18

申请号：US15803142

申请日：2017-11-03

Applicant: Johnson Electric S.A.

Inventor： Chiping Sun ,  Qiubao Wang ,  Ken Wong ,  Enhui Wang ,  Haibo Jiang ,  Yunlong Jiang

IPC: H02P29/024 ,  H02P6/17 ,  H02P27/08

Abstract: A motor-driven integrated circuit comprises a PWM output unit and an overcurrent comparator coupled with the PWM output unit. The overcurrent comparator receives a detection signal and compares the detection signal with a reference value. When the detection signal is larger than the reference value, the overcurrent comparator outputs an overcurrent protection signal to control the PWM output unit enter an overcurrent protection mode.