Invention Grant
- Patent Title: BLDC zero crossing with BEMF, gating, and tri-state detect circuitry
-
Application No.: US15182126Application Date: 2016-06-14
-
Publication No.: US09966887B2Publication Date: 2018-05-08
- Inventor: Yisong Lu
- Applicant: TEXAS INSTRUMENTS INCORPORATED
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent Lawrence J. Bassuk; Charles A. Brill; Frank D. Cimino
- Main IPC: H02P6/00
- IPC: H02P6/00 ; H02P6/182 ; H02P27/08
Abstract:
A back electromotive force (BEMF) zero cross may be detected in a brushless direct current (BLDC) motor that is controlled by pulse width modulation (PWM). A phase input of the BLDC motor is tri-stated during PWM periods in which the phase input conducts motor drive current, and the tri-stating of the phase input is used to determine whether a BEMF zero cross has occurred in the BLDC motor.
Public/Granted literature
- US20160294310A1 TRI-STATING BRUSHLESS DC MOTOR PHASE FOR DIRECT DETECTION OF BACK EMF ZERO CROSS Public/Granted day:2016-10-06
Information query
