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.