专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5616993A Method and apparatus for switching a motor between bipolar and unipolar mode 失效
标题翻译：用于在双极和单极模式之间切换电动机的方法和装置
公开(公告)号：US5616993A
公开(公告)日：1997-04-01
申请号：US331370
申请日：1994-10-27
申请人： Li-Hsin D. Lu , Karl M. Schlager
发明人： Li-Hsin D. Lu , Karl M. Schlager
IPC分类号： H02P6/00 , H02P6/08
CPC分类号： H02P6/08 , H02P6/34
摘要： A method and apparatus for switching a motor between bipolar and unipolar mode. During each phase of the bipolar mode, one of the coils floats and has a back emf. In the method, first, a mode change signal requesting a change between the bipolar mode and the unipolar mode is received. Second, the back emf across the floating coil is monitored. Third, a point in time when the back emf equals the center tap voltage is detected. Last, the motor is switched between the bipolar mode and the unipolar mode at a point away from point in time when the back emf across the floating coil equals the center tap voltage. Various circuitry is also disclosed for switching a motor between a bipolar mode and a unipolar mode.
摘要翻译：一种用于在双极和单极模式之间切换电动机的方法和装置。在双极模式的每个阶段期间，其中一个线圈浮起并具有背面电动势。在该方法中，首先，接收请求双极模式和单极模式之间的变化的模式改变信号。第二，监控浮动线圈的背面电动势。第三，检测到反电动势等于中心抽头电压的时间点。最后，电动机在双极模式和单极模式之间在离开浮动线圈的背面电动势等于中心抽头电压的时间点之间切换。还公开了用于在双极模式和单极模式之间切换电动机的各种电路。

2. 发明授权

US5550446A Dual slew rate circuit for driver transistors in disk drives 失效
标题翻译：用于驱动器驱动器晶体管的双转换速率电路
公开(公告)号：US5550446A
公开(公告)日：1996-08-27
申请号：US316891
申请日：1994-09-30
申请人： Karl M. Schlager , Li-Hsin D. Lu
发明人： Karl M. Schlager , Li-Hsin D. Lu
IPC分类号： H02P6/00 , H02P7/00
CPC分类号： H02P6/28
摘要： A method and circuit for providing a dual slew rate to a driver transistor. The method includes turning off a driver transistor at a programmable slew rate until a BEMF voltage spike is sensed, and then switching in a slower clamping slew rate. The slew rates are controlled by discharging a capacitor through a programmable discharge path until a voltage spike is detected and then through a clamping discharge path. The discharge paths include several transistors connected in series and control by digital logic.
摘要翻译：一种用于向驱动晶体管提供双转换速率的方法和电路。该方法包括以可编程的转换速率关断驱动晶体管，直到感测到BEMF电压尖峰，然后切换较慢的钳位转换速率。压摆率通过将电容器放电通过可编程放电路径进行控制，直到检测到电压尖峰，然后通过钳位放电路径。放电路径包括串联连接并由数字逻辑控制的多个晶体管。

3. 发明授权

US5656897A Current sensing and control in brushless DC motors 失效
标题翻译：无刷直流电机的电流检测与控制
公开(公告)号：US5656897A
公开(公告)日：1997-08-12
申请号：US315924
申请日：1994-09-30
申请人： Francesco Carobolante , Karl Schlager , Li-Hsin D. Lu
发明人： Francesco Carobolante , Karl Schlager , Li-Hsin D. Lu
IPC分类号： H02P6/00 , H02P6/08 , H02P6/20 , H02K23/00
CPC分类号： H02P6/085 , H02P6/20 , H02P6/28
摘要： A motor drive system, and method for operating the same, which includes current mirror load current sensing, is disclosed. Sensed current is used in the well known manner to control the low side drive of the motor. The disclosed motor system operates in a bipolar mode on startup, and in a unipolar mode during full speed operation. In unipolar mode, a current mirror transistor is provided to sense the load current through the center tap drive transistor in a continuous manner. Ripple in the sensed current is avoided, as the center tap drive transistor is not commutated during motor operation in unipolar mode. In bipolar mode, current mirrors are provided for both of the high side and low side drive transistors in each leg, with the currents summed for each coil at a sum node, and with the summed current applied to a cumulative sum node; the summed current never drops to zero, as only one drive transistor changes in each phase change in the commutation sequence.
摘要翻译：公开了一种电动机驱动系统及其操作方法，其包括电流镜负载电流检测。以众所周知的方式使用感测电流来控制电动机的低侧驱动。所公开的电动机系统在启动时以双极模式运行，并且在全速运行期间以单极模式运行。在单极模式中，提供电流镜晶体管以连续的方式感测通过中心抽头驱动晶体管的负载电流。由于中心抽头驱动晶体管在单极模式下的电动机运行期间不整流，所以避免了检测到的电流波纹。在双极性模式中，为每个支路中的高侧驱动晶体管和低侧驱动晶体管提供电流镜，其中每个线圈在和节点处相加的电流以及加到累加和节点的求和电流; 由于只有一个驱动晶体管在换相序列中的每个相位变化中都会改变总和电流。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式