公开(公告)号：US11601078B2

公开(公告)日：2023-03-07

申请号：US17488119

申请日：2021-09-28

Applicant: Richtek Technology Corporation

Inventor： I-Chi Lin ,  Chang-Yi Lin ,  Ming-Cheng Chen

IPC: H02P6/14 ,  H02P6/182 ,  H02M7/5387 ,  H02P6/20 ,  H02M1/088

Abstract: A BLDC motor driver circuit includes: a driving power stage circuit configured to provide a start-up test signal in a start-up mode to excite a BLDC motor, to drive a rotor of the BLDC motor to rotate for a test; a current unidirectional circuit coupled to the BLDC motor at a reverse end for detecting a BEMF, to generate a detection signal at a forward end of the current unidirectional circuit, wherein when a voltage at the reverse end exceeds a voltage at the forward end, the current unidirectional circuit limits the voltage at the forward end not to be higher than a clamp voltage; a biasing circuit for biasing the current unidirectional circuit in a forward operation state and for providing the clamp voltage; and a sensor circuit for generating a sensing signal according to the detection signal to indicate a test rotation state of the BLDC motor.

公开(公告)号：US20220149763A1

公开(公告)日：2022-05-12

申请号：US17488119

申请日：2021-09-28

Applicant: Richtek Technology Corporation

Inventor： I-Chi Lin ,  Chang-Yi Lin ,  Ming-Cheng Chen

IPC: H02P6/182 ,  H02P6/20 ,  H02M7/5387

Abstract: A BLDC motor driver circuit includes: a driving power stage circuit configured to provide a start-up test signal in a start-up mode to excite a BLDC motor, to drive a rotor of the BLDC motor to rotate for a test; a current unidirectional circuit coupled to the BLDC motor at a reverse end for detecting a BEMF, to generate a detection signal at a forward end of the current unidirectional circuit, wherein when a voltage at the reverse end exceeds a voltage at the forward end, the current unidirectional circuit limits the voltage at the forward end not to be higher than a clamp voltage; a biasing circuit for biasing the current unidirectional circuit in a forward operation state and for providing the clamp voltage; and a sensor circuit for generating a sensing signal according to the detection signal to indicate a test rotation state of the BLDC motor.