公开(公告)号：US5473238A

公开(公告)日：1995-12-05

申请号：US138315

申请日：1993-10-18

申请人： Paul W. Latham, II ,  Peter K. Scheller

发明人： Paul W. Latham, II ,  Peter K. Scheller

IPC分类号： G11B19/20 ,  H02P6/08 ,  H02P5/40 ,  H02P6/04

CPC分类号： H02P6/085 ,  G11B19/20

摘要： A disc drive circuit includes a pair of DC busses across which are directly connected a disc actuator power amplifier and a three phase spindle motor power amplifier which may be comprised of three circuit branches, each branch having two NMOS transistors connected in series with the junction therebetween connected to one of three spindle motor terminals. A transistor switch is connected between a DC supply source and the DC busses for disconnecting the busses from the voltage source only when the supply voltage drops below a nominal operating voltage range. In one embodiment a full wave diode rectifier is also directly connected across the pair of busses and further connected to the three motor terminals, whereby when the switch is open the back e.m.f. of the free spinning spindle motor energizes the actuator amplifier enabling parking of the actuator heads. In another embodiment the drain to channel regions of the six NMOS transistors are adapted to assume the role of a full wave rectifier. In a third embodiment, added circuitry transforms the NMOS transistors into six simulated diodes to serve as a very efficient full wave rectifier only when the switch opens.

摘要翻译： 磁盘驱动电路包括一对直流总线，两个直流总线直接连接在盘驱动器功率放大器和三相主轴电机功率放大器之间，三相主轴电机功率放大器可以由三个电路分支组成，每个分支具有两个NMOS晶体管，它们与它们之间的接点串联连接 连接到三个主轴电机端子之一。 只有当电源电压低于标称工作电压范围时，晶体管开关连接在直流电源和直流总线之间，用于断开总线与电压源的连接。 在一个实施例中，全波二极管整流器也直接连接在一对总线上，并进一步连接到三个电动机端子，由此当开关打开时，后面的e.m.f. 的自由纺纱主轴电机为执行器放大器通电，从而可以停止执行器头。 在另一个实施例中，六个NMOS晶体管的漏极到沟道区域适于承担全波整流器的作用。 在第三实施例中，添加的电路将NMOS晶体管变换为六个模拟二极管，仅当开关打开时用作非常有效的全波整流器。