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.

公开(公告)号：US20250096705A1

公开(公告)日：2025-03-20

申请号：US18827690

申请日：2024-09-07

Applicant: Richtek Technology Corporation

Inventor： I-Chi Lin ,  Hao-Che Ma ,  Yuan-Hsun Chang ,  Jong-Ruey Yang ,  Chang-Yi Lin

IPC: H02P3/10 ,  H02P3/02 ,  H02P7/291

Abstract: A multiphase motor driving circuit includes: a power stage circuit; and a control circuit. In a motor braking mode, when a holding voltage is less than the first voltage threshold, a first sub-mode is entered, in which the control circuit controls at least a portion of switches in the power stage circuit with a pulse width modulation (PWM) signal to switch periodically, thereby converting a back electromotive force (EMF) of a multiphase motor into the holding voltage to supply power to the control circuit. In the motor braking mode, when the holding voltage is greater than the second voltage threshold, a second sub-mode is entered, in which the control circuit controls at least a portion of switches in the power stage circuit with the PWM signal to keep them continuously conductive, thereby consuming the back EMF of the multiphase motor to reduce a speed of the multiphase motor.