Method and apparatus for speed control of voice coil motor retract operation dependent upon available power
作者： Lorenzo Ferrario , Kaufik Linggajaya
DOI:
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摘要: The back EMF (B ) of a motor is sensed and compared to target generate an error control signal. circuit supply voltage also sensed. A PWM signal generated in response comparison the ramp having variable slope. slope selected voltage. then driven sign used selectively short one terminals reference node while other terminal
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