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    • 1. 发明申请
    • Motor Drive Circuit and Illumination Apparatus
    • 电动机驱动电路和照明装置
    • US20120068605A1
    • 2012-03-22
    • US13070348
    • 2011-03-23
    • Tetsuya YoshitomiMasashi TanabeSyunji Suzuki
    • Tetsuya YoshitomiMasashi TanabeSyunji Suzuki
    • H01J7/24H02P7/29H02P6/22
    • H02P6/22H02P6/30
    • A motor-drive circuit includes: an output transistor configured to supply a drive current to a motor for a cooling fan; a switching-control circuit configured to control switching of the output transistor so that the motor rotates in a first direction, or rotates in a second direction opposite to the first direction; and a switching circuit configured to, when a first time has elapsed since start of rotation of the motor in the first direction, cause the switching-control circuit to start switching control so that the motor stops rotating in the first direction and thereafter rotates in the second direction, and configured to, when a second time has elapsed since start of rotation of the motor in the second direction, cause the switching-control circuit to start switching control so that the motor stops rotating in the second direction and thereafter rotates in the first direction.
    • 电动机驱动电路包括:输出晶体管,被配置为向用于冷却风扇的电动机提供驱动电流; 开关控制电路,被配置为控制所述输出晶体管的开关,使得所述电动机沿第一方向旋转,或者沿与所述第一方向相反的第二方向旋转; 以及开关电路,其被配置为当从所述电动机沿所述第一方向旋转开始经过第一次时,使所述开关控制电路开始切换控制,使得所述电动机在所述第一方向上停止旋转,然后在所述第一方向上旋转 第二方向,并且被配置为当从第二方向的电动机的旋转开始经过第二次时,使开关控制电路开始切换控制,使得电动机在第二方向上停止旋转,然后在 第一个方向
    • 2. 发明授权
    • Motor drive circuit and illumination apparatus
    • 电机驱动电路及照明装置
    • US08736214B2
    • 2014-05-27
    • US13070348
    • 2011-03-23
    • Tetsuya YoshitomiMasashi TanabeSyunji Suzuki
    • Tetsuya YoshitomiMasashi TanabeSyunji Suzuki
    • G05D11/08
    • H02P6/22H02P6/30
    • A motor-drive circuit includes: an output transistor configured to supply a drive current to a motor for a cooling fan; a switching-control circuit configured to control switching of the output transistor so that the motor rotates in a first direction, or rotates in a second direction opposite to the first direction; and a switching circuit configured to, when a first time has elapsed since start of rotation of the motor in the first direction, cause the switching-control circuit to start switching control so that the motor stops rotating in the first direction and thereafter rotates in the second direction, and configured to, when a second time has elapsed since start of rotation of the motor in the second direction, cause the switching-control circuit to start switching control so that the motor stops rotating in the second direction and thereafter rotates in the first direction.
    • 电动机驱动电路包括:输出晶体管,被配置为向用于冷却风扇的电动机提供驱动电流; 开关控制电路,被配置为控制所述输出晶体管的开关,使得所述电动机沿第一方向旋转,或者沿与所述第一方向相反的第二方向旋转; 以及开关电路,其被配置为当从所述电动机沿所述第一方向旋转开始经过第一次时,使所述开关控制电路开始切换控制,使得所述电动机在所述第一方向上停止旋转,然后在所述第一方向上旋转 第二方向,并且被配置为当从第二方向的电动机的旋转开始经过第二次时,使开关控制电路开始切换控制,使得电动机在第二方向上停止旋转,然后在 第一个方向
    • 8. 发明授权
    • Driving circuit for stepping motor
    • 步进电机驱动电路
    • US08416664B1
    • 2013-04-09
    • US13630922
    • 2012-09-28
    • Hiroaki KawakamiMasashi Tanabe
    • Hiroaki KawakamiMasashi Tanabe
    • G11B20/00
    • G11B7/08582
    • A stepping-motor-driving circuit for an optical pickup: includes a control-signal-generating circuit to generate a plurality of control signals for supplying driving currents to driving coils having a plurality of phases during energized periods, with a de-energized period therebetween; a plurality of output circuits to supply the currents to the respective coils, in response to the signals; an induced-voltage-detecting circuit to compare a voltage generated each in the coils with a threshold voltage during the de-energized period; a threshold-voltage-setting circuit; and a determining circuit to determine whether a collision state is present where the pickup reaches an end of a movement range, based on an induced-voltage-detecting-circuit-detection result, the threshold voltage set at a voltage between a voltage generated each in the coils during the de-energized period when the stepping motor stops or rotates in the state, and a voltage generated therein in the de-energized period when no collision state is present.
    • 一种用于光学拾取器的步进电动机驱动电路:包括控制信号发生电路,用于产生多个控制信号,用于在通电期间向具有多个相位的驱动线圈提供驱动电流,其间具有断电周期 ; 多个输出电路,用于响应于所述信号向各个线圈提供电流; 感应电压检测电路,用于在断电期间将线圈中产生的电压与阈值电压进行比较; 阈值电压设定电路; 以及确定电路,其基于感应电压检测电路检测结果来确定在所述拾取器到达所述移动范围的结束处是否存在碰撞状态,所述阈值电压设置在每个所产生的电压之间的电压 在步进电动机在该状态下停止或旋转的断电期间的线圈,以及在没有碰撞状态的情况下在断电期间产生的电压。