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公开(公告)号：EP1433248A1
公开(公告)日：2004-06-30
申请号：EP02800436.4
申请日：2002-10-02
申请人： Abbott Laboratories
发明人： WANG, Bing , WALKER, Donny, R. , ROTH, Brian, J.
摘要： A stepper motor control circuit reduces ripple current by applying both fast and slow current decays to a motor phase when current is being reduced in the motor phase while following a falling current waveform. The control circuit uses an initial fast decay to reduce a winding current and then switches to a slow decay until a winding current is sampled again. The control circuitry samples a winding current and compares the sampled current to a reference current to determine if current is to be applied or reduced using fast and/or slow decay methods. Different phase current sample circuits allow either constant current sensing or selective current sensing.
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公开(公告)号：EP1433248B1
公开(公告)日：2009-09-09
申请号：EP02800436.4
申请日：2002-10-02
申请人： ABBOTT LABORATORIES
发明人： WANG, Bing , WALKER, Donny, R. , ROTH, Brian, J.
摘要： A stepper motor control circuit reduces ripple current by applying both fast and slow current decays to a motor phase when current is being reduced in the motor phase while following a falling current waveform. The control circuit uses an initial fast decay to reduce a winding current and then switches to a slow decay until a winding current is sampled again. The control circuitry samples a winding current and compares the sampled current to a reference current to determine if current is to be applied or reduced using fast and/or slow decay methods. Different phase current sample circuits allow either constant current sensing or selective current sensing.
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