发明申请
- 专利标题： Stepping motor control circuit and analog electronic timepiece
- 专利标题（中）： 步进电机控制电路和模拟电子表
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申请号： US13066043申请日： 2011-04-05
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公开(公告)号： US20110242946A1公开(公告)日： 2011-10-06
- 发明人: Kenji Ogasawara , Akira Takakura , Saburo Manaka , Kazumi Sakumoto , Keishi Honmura , Hiroshi Shimizu , Kosuke Yamamoto , Shotaro Kamiyama
- 申请人： Kenji Ogasawara , Akira Takakura , Saburo Manaka , Kazumi Sakumoto , Keishi Honmura , Hiroshi Shimizu , Kosuke Yamamoto , Shotaro Kamiyama
- 优先权： JP2010-087947 20100406; JP2011-020105 20110201
- 主分类号： G04C3/14
- IPC分类号： G04C3/14 ; H02P8/38
摘要：
It is configured to include: a secondary battery as a power supply that supplies power at least to a stepping motor; a rotation detection portion that detects a rotation state of the stepping motor; a control portion that drives the stepping motor by selecting a drive pulse having energy corresponding to the rotation state of the stepping motor from a plurality of drive pulses; and a solar battery that charges the secondary battery. Upon determination that it is possible to rotate the stepping motor by an overcharge indicating drive pulse having predetermined energy, the control portion drives the stepping motor by changing a current drive pulse to an overconsuming drive pulse having larger energy than the overcharge indicating drive pulse. It thus becomes possible to suppress deterioration of a secondary battery caused by overcharge without having to provide a dedicated voltage detection circuit, such as a comparator circuit.
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