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    • 38. 发明申请
    • Stepping motor control circuit and analogue electronic watch
    • 步进电机控制电路和模拟电子手表
    • US20110199865A1
    • 2011-08-18
    • US12931995
    • 2011-02-15
    • Kenji Ogasawara
    • Kenji Ogasawara
    • G04C3/14H02P8/12G04C23/00
    • G04C3/143G04G19/12H02P8/12H02P8/34
    • The invention is aimed to be capable of detecting lowering of a power source without providing a circuit specific for voltage detection such as a comparator circuit. A stepping motor control circuit includes a battery configured to supply an electric power at least to a stepping motor, a rotation detection circuit configured to detect the state of rotation of the stepping motor, and a control unit configured to select an upgraded main drive pulse from a plurality of the main drive pulses having energy ranks different from each other and drive the stepping motor with the selected main drive pulse. The control unit is configured to determine that the voltage of the battery lowered to a level equal to or lower than the predetermined value when the main drive pulse reaches a maximum main drive pulse in a predetermined rank by upgrading it a number of times smaller than the predetermined number of times within a predetermined time.
    • 本发明的目的在于能够检测电源的降低,而不需要提供诸如比较器电路之类的电压检测电路。 一种步进电动机控制电路,包括:至少向步进电动机供给电力的电池;被配置为检测步进电动机的旋转状态的旋转检测电路;以及控制单元,其被配置为从 多个主驱动脉冲具有彼此不同的能量,并且以所选择的主驱动脉冲驱动步进电机。 控制单元被配置为当主驱动脉冲以预定等级达到最大主驱动脉冲时将电池的电压降低到等于或低于预定值的水平,通过将其升高到小于 在预定时间内预定次数。