Invention Grant
US08278860B2 Variable pulse width modulation for reduced zero-crossing granularity in sensorless brushless direct current motors
有权
可变脉冲宽度调制，用于降低无传感器无刷直流电机的零交叉粒度
- Patent Title: Variable pulse width modulation for reduced zero-crossing granularity in sensorless brushless direct current motors
- Patent Title (中): 可变脉冲宽度调制，用于降低无传感器无刷直流电机的零交叉粒度
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Application No.: US12767101Application Date: 2010-04-26
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Publication No.: US08278860B2Publication Date: 2012-10-02
- Inventor: Ward R. Brown
- Applicant: Ward R. Brown
- Applicant Address: US AZ Chandler
- Assignee: Microchip Technology Incorporated
- Current Assignee: Microchip Technology Incorporated
- Current Assignee Address: US AZ Chandler
- Agency: King & Spalding L.L.P.
- Main IPC: H02P6/00
- IPC: H02P6/00
Abstract:
Zero-crossing detection accuracy is enhanced in a sensorless brushless direct current (BLDC) motor by increasing the PWM drive frequency in anticipation of a zero-crossing event in any one or more commutation periods. Once a zero-crossing event is detected, the PWM frequency can go back to a lower normal operating frequency. Switching losses of the power drive transistors are thereby minimized while maintaining accurate zero-crossing detection for stable operation of the BLDC motor.
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