公开(公告)号：US5260634A

公开(公告)日：1993-11-09

申请号：US909617

申请日：1992-07-07

申请人： Hiroshi Tsuyuguchi ,  Tohro Miura ,  Naoki Sugeta ,  Tadashi Terada ,  Miya Enami

发明人： Hiroshi Tsuyuguchi ,  Tohro Miura ,  Naoki Sugeta ,  Tadashi Terada ,  Miya Enami

IPC分类号： G11B21/08 ,  H02P8/12 ,  H02P8/00

CPC分类号： H02P8/12 ,  Y10S388/915

摘要： In order to drive the stepper motor of a floppy disk drive with practically constant current in the face of fluctuations in supply voltage fed from a host system, a power control pulse generator circuit is provided which produces a series of power control pulses having a duty ratio dependent upon fluctuating supply voltage. The power control pulses are used for interrupting the excitation of the stepper motor windings during track seek operation. The power control pulses are generated by first repeatedly counting clock pulses from the host system to a predetermined number to provide periodically varying digital data, then translating the digital data into a triangular wave having an amplitude dependent upon the supply voltage, and then comparing the triangular wave with a reference voltage.

摘要翻译： 为了在面对从主机系统馈送的电源电压波动的情况下驱动具有几乎恒定电流的软盘驱动器的步进电机，提供了功率控制脉冲发生器电路，其产生一系列具有占空比的功率控制脉冲 取决于电源电压波动。 功率控制脉冲用于在跟踪寻道操作期间中断步进电机绕组的激励。 通过首先将从主机系统的时钟脉冲重复计数到预定数量来产生功率控制脉冲，以提供周期性变化的数字数据，然后将数字数据转换成具有取决于电源电压的幅度的三角波，然后比较三角形 波参考电压。