公开(公告)号：WO1997047007A1

公开(公告)日：1997-12-11

申请号：PCT/US1997009540

申请日：1997-06-03

Applicant: QUANTUM CORPORATION

Inventor： QUANTUM CORPORATION ,  ATAEE, Mehran ,  MORTAZAVI, Sassan

IPC: G11B21/12

CPC classification number: G11B21/12

Abstract: A voltage boost circuit (40) within a hard disk drive is realized by switching a center tap node (24CT) of a three phase spindle motor (16) to ground during a power down sequence, thereby employing inductance of the spindle motor (16) as a voltage boost inductor. The boosted voltage is rectified and stored in a capacitor (46) for use, e.g., to control a source transistor (114) of an actuator driver (36) during an actuator retract operation.

Abstract translation: 通过在断电顺序期间将三相主轴电动机（16）的中心抽头节点（24CT）切换到地，从而利用主轴电机（16）的电感来实现硬盘驱动器内的升压电路（40） 作为升压电感。 升压电压被整流并存储在用于例如在致动器缩回操作期间控制致动器驱动器（36）的源极晶体管（114）的电容器（46）中。

公开(公告)号：WO1997041558A1

公开(公告)日：1997-11-06

申请号：PCT/US1997007291

申请日：1997-04-29

Applicant: QUANTUM CORPORATION

Inventor： QUANTUM CORPORATION ,  MORTAZAVI, Sassan ,  ATAEE, Mehran

IPC: G11B15/46

CPC classification number: G11B5/59605 ,  G11B5/022 ,  G11B5/5547 ,  H02P25/034 ,  H03F3/2173

Abstract: A voice coil motor (VCM) driver (28) has four field effect transistors (90, 94, 98, 104) connected to a motor coil (24) as an H-bridge (Viso). A sense resistor (R5) in series with the coil (24) and the H-bridge (Viso) senses coil current. A feedback amplifier (62) provides a feedback signal from a voltage developed across the sense resistor (R5). A summing junction sums current command signals with the feedback signal. A transconductance loop compensation amplifier (56) has an inverting input connected to the summing junction, has a non-inverting input connected to a reference level, and has an output control signal node. The control level is connected to control linear transconductance differential driver amplifiers (56) including the four field effect transistors during a linear drive mode. A pulse width modulation (PWM) generator (72) connected to the output control level during a PWM drive mode applies the pulses to a first one of the four field effect transistors, and a polarity control circuit (86) responds to a driving current direction signal by controlling another one of the four field effect transistors during the PWM drive mode.

Abstract translation: 音圈马达（VCM）驱动器（28）具有连接到作为H桥（Viso）的马达线圈（24）的四个场效应晶体管（90,94,98,104）。 与线圈（24）和H桥（Viso）串联的感测电阻器（R5）感测线圈电流。 反馈放大器（62）提供来自检测电阻器（R5）两端产生的电压的反馈信号。 求和点将电流指令信号与反馈信号相加。 跨导环路补偿放大器（56）具有连接到求和点的反相输入端，具有连接到参考电平的非反相输入端，并具有输出控制信号节点。 在直线驱动模式期间，控制电平连接到包括四个场效应晶体管的线性跨导差分驱动放大器（56）。 在PWM驱动模式期间连接到输出控制电平的脉冲宽度调制（PWM）发生器（72）将脉冲施加到四个场效应晶体管中的第一个，并且极性控制电路（86）响应驱动电流方向 信号通过在PWM驱动模式期间控制四个场效应晶体管中的另一个。