Invention Grant
- Patent Title: Circuit and method for controlling brushless DC motor
- Patent Title (中): 无刷直流电机控制电路及方法
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Application No.: US10823214Application Date: 2004-04-12
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Publication No.: US07202617B2Publication Date: 2007-04-10
- Inventor: Zhigan Wu , Genfu Zhou , Jianping Ying
- Applicant: Zhigan Wu , Genfu Zhou , Jianping Ying
- Applicant Address: TW Taoyuan Hsien
- Assignee: Delta Electronics, Inc.
- Current Assignee: Delta Electronics, Inc.
- Current Assignee Address: TW Taoyuan Hsien
- Agency: J.C. Patents
- Main IPC: H02P1/18
- IPC: H02P1/18

Abstract:
A circuit for controlling a brushless permanent magnet motor is provided. The circuit comprises windings, each of the windings having a first end connected at a common node and each of the windings having a second end connectable directly to supply voltages by switches, the second end connected to an upper supply voltage or connected to a lower supply voltage or disconnected from the supply voltages; blocking circuitry connectable with the second ends, the blocking circuitry producing a blocked voltage; a comparator receiving the blocked voltage on one input and a reference voltage on another input, the comparator result indicating polarity of a back emf voltage in the associated winding; and a latch providing control signals for the circuit, an input of the latch enabled by an enable signal, an output of the latch comprising a back emf voltage detection signal. The blocking circuitry and the comparator are duplicated for each of the windings.
Public/Granted literature
- US20050225272A1 Circuit and method for controlling brushless DC motor Public/Granted day:2005-10-13
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