公开(公告)号：US5451832A

公开(公告)日：1995-09-19

申请号：US85762

申请日：1993-07-01

Applicant: Scott W. Cameron ,  Karl M. Schlager

Inventor： Scott W. Cameron ,  Karl M. Schlager

IPC: H02P6/18 ,  H02P6/24 ,  H02P3/10

CPC classification number: H02P6/24

Abstract: A method and circuit for braking a forward rotation of a rotor of a polyphase DC motor. A commutation sequencer is incremented by several phases to produce an incremented commutation sequence to produce a magnetic flux vector that lags a magnetic pole of the motor. Driving currents are applied to coils of the motor in accordance with the incremented commutation sequence to brake the rotor. The method is implemented in a circuit that has a sequencer for incrementally generating sets of commutation signals to select stator coils for energization to rotate the rotor. A power stage to which the commutation signals are applied energizes the selected coils in accordance with the commutation signals. A circuit interrupts the energization of the selected coils and the commutation sequence is altered to produce a sequence that produces a negative torque on the rotor. Circuits are also provided to inhibit application of the altered commutation sequence until recirculation currents in the power stage caused by the coils in response to the reduction of the input voltage have fallen below a predetermined level, and to inhibit application of the altered commutation sequence until a voltage on a sense resistor between the power stage and a reference potential has fallen below a predetermined level after an operation of the circuit for interrupting the energization of the selected coils.

Abstract translation: 一种用于制动多相直流电动机转子正转的方法和电路。 换向序列发生器增加多个相位以产生递增的换向序列，以产生滞后于电机的磁极的磁通矢量。 根据递增的换向顺序将驱动电流施加到电动机的线圈以制动转子。 该方法在具有用于增量地产生换向信号组的定序器的电路中实现，以选择用于激励转子的定子线圈。 施加换向信号的功率级根据换向信号激励所选择的线圈。 A电路中断所选择的线圈的通电，改变换向序列以产生在转子上产生负转矩的序列。 还提供电路以阻止改变的换向序列的应用，直到响应于输入电压的降低而由线圈引起的再循环电流已经降低到预定水平以下并且阻止改变的换向序列的应用直到 功率级与参考电位之间的检测电阻上的电压在用于中断所选择的线圈的通电的电路的操作之后已经下降到预定水平以下。

公开(公告)号：US5619109A

公开(公告)日：1997-04-08

申请号：US477458

申请日：1995-06-07

Applicant: Scott W. Cameron ,  Karl M. Schlager

Inventor： Scott W. Cameron ,  Karl M. Schlager

IPC: H02P6/18 ,  H02P6/24 ,  H02P3/10

CPC classification number: H02P6/24

Abstract: A method and circuit for braking a forward rotation of a rotor of a polyphase DC motor. A commutation sequencer is incremented by several phases to produce an incremented commutation sequence to produce a magnetic flux vector that lags a magnetic pole of the motor. Driving currents are applied to coils of the motor in accordance with the incremented commutation sequence to brake the rotor. The method is implemented in a circuit that has a sequencer for incrementally generating sets of commutation signals to select stator coils for energization to rotate the rotor. A power stage to which the commutation signals are applied energizes the selected coils in accordance with the commutation signals. A circuit interrupts the energization of the selected coils and the commutation sequence is altered to produce a sequence that produces a negative torque on the rotor. Circuits are also provided to inhibit application of the altered commutation sequence until recirculation currents in the power stage caused by the coils in response to the reduction of the input voltage have fallen below a predetermined level, and to inhibit application of the altered commutation sequence until a voltage on a sense resistor between the power stage and a reference potential has fallen below a predetermined level after an operation of the circuit for interrupting the energization of the selected coils.

Abstract translation: 一种用于制动多相直流电动机的转子正转的方法和电路。 换向序列发生器增加多个相位以产生递增的换向序列，以产生滞后于电机的磁极的磁通矢量。 根据递增的换向顺序将驱动电流施加到电动机的线圈以制动转子。 该方法在具有用于增量地产生换向信号组的定序器的电路中实现，以选择用于激励转子的定子线圈。 施加换向信号的功率级根据换向信号激励所选择的线圈。 A电路中断所选择的线圈的通电，改变换向序列以产生在转子上产生负转矩的序列。 还提供电路以阻止改变的换向序列的应用，直到响应于输入电压的降低而由线圈引起的再循环电流已经降低到预定水平以下并且阻止改变的换向序列的应用直到 功率级与参考电位之间的检测电阻上的电压在用于中断所选择的线圈的通电的电路的操作之后已经下降到预定水平以下。

公开(公告)号：US6064539A

公开(公告)日：2000-05-16

申请号：US989094

申请日：1997-12-11

Applicant: Michael W. Null ,  Francesco Carobolante ,  Karl M. Schlager

Inventor： Michael W. Null ,  Francesco Carobolante ,  Karl M. Schlager

IPC: G11B21/12 ,  G11B5/54

CPC classification number: G11B5/54

Abstract: A method of parking the head by first moving the head toward the inner diameter of the disc an then back across the disc and parking the head on a flat part of a ramp. In one embodiment, a moderate voltage on the motor drives the head toward the inner diameter of the disc until the head hits the inner crash stop and then a moderate current drives the head back across the disc to give the head enough momentum to get to the flat part of he ramp. In another embodiment, more stages, each having a different voltage, are used to get better control of the velocity of the head as it is being driven across the disc. A higher voltage is also used to turn the head to move toward the inner diameter of the disc when it is moving fast toward the outer diameter. A retract circuit controls the movement of the head during retract. To be able to drive the head in the tow directions, the retract circuit needs to be bipolar, containing both a current source and a current sink. Counters are used to time the driving of the head. Driving the head toward the outer diameter of the disc across substantially the entire disc permits the head to gather momentum as the head approaches the ramp, and use a lower current to ensure that the head gets to the flat art of the ramp where it is then parked. Parking the head on the flat part of the ramp prevents the head from landing on the disc, preventing damage to the head and the disc, and eliminating the possibility of loss or corruption of data due to the head landing on the disc.

Abstract translation: 通过首先将头朝向盘的内径移动然后穿过盘并将头停放在斜坡的平坦部分上来停止头部的方法。 在一个实施例中，电动机上的中等电压将磁头驱动朝向盘的内径，直到磁头撞击内部碰撞停止，然后中等电流将磁头驱回磁盘，以使磁头足够动量以达到 平坦的部分他斜坡。 在另一个实施例中，使用具有不同电压的更多级，以便当磁头被驱动穿过磁盘时，更好地控制磁头的速度。 当高速向外径移动时，较高的电压也用于转动头朝向盘的内径移动。 缩回电路在收回期间控制头部的移动。 为了能够沿牵引方向驱动头部，缩回电路需要是双极的，包含电流源和电流槽。 计数器用于驱动头部。 当头部接近斜坡时，将磁头朝向盘的外径驱动，允许磁头在磁头接近斜坡时收集动量，并使用较低的电流来确保磁头进入斜坡的平面技术 停车 将头部停放在坡道的平坦部分上，防止头部落在椎间盘上，防止头部和椎间盘损伤，并消除由于头部着陆在椎间盘而导致的数据丢失或损坏的可能性。

公开(公告)号：US5486788A

公开(公告)日：1996-01-23

申请号：US320142

申请日：1994-10-07

Applicant: Karl M. Schlager ,  Solomon K. Ng

Inventor： Karl M. Schlager ,  Solomon K. Ng

IPC: H03F1/30 ,  H03F1/02 ,  H03F1/14

CPC classification number: H03F1/303

Abstract: A chopper stabilized current amplifier circuit is disclosed. The current amplifier circuit includes a main operational transconductance amplifier, a nulling transconductance amplifier, two capacitors, four switches, and a timing control circuit. The timing control circuit uses analog inverters to decrease the slew rate of the switching of the switches to decrease the noise in the system.

Abstract translation: 公开了一种斩波稳定电流放大器电路。 电流放大器电路包括主要的运算跨导放大器，零空间跨导放大器，两个电容器，四个开关和定时控制电路。 定时控制电路使用模拟逆变器来降低开关切换的转换速率，以降低系统中的噪声。

公开(公告)号：US5616993A

公开(公告)日：1997-04-01

申请号：US331370

申请日：1994-10-27

Applicant: Li-Hsin D. Lu ,  Karl M. Schlager

Inventor： Li-Hsin D. Lu ,  Karl M. Schlager

IPC: H02P6/00 ,  H02P6/08

CPC classification number: H02P6/08 ,  H02P6/34

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US5661383A

公开(公告)日：1997-08-26

申请号：US315766

申请日：1994-09-30

Applicant: Karl M. Schlager ,  Massimiliano Brambilla

Inventor： Karl M. Schlager ,  Massimiliano Brambilla

IPC: H02P6/08 ,  H02P6/00 ,  H02P6/10 ,  H02P6/12 ,  H02P6/14 ,  H01R39/46

CPC classification number: H02P6/14 ,  H02P6/10 ,  H02P6/28

Abstract: A circuit for controlling the slew rate at a motor coil during turn-on in a commutation sequence is disclosed. The disclosed circuit includes a switched current mirror that receives the commutation signal, and that provides a mirrored current to the input of an integrating buffer amplifier when its associated coil is to be driven. The integrating buffer amplifier includes an amplifier with a feedback capacitor, and a current source connected at its input, for reducing the voltage slew rate during turn-off of the transistor. The mirrored current applied to the input of the integrating buffer amplifier is greater than that of the current source, but limited so as to reduce the voltage slew at the coil.

Abstract translation: 公开了一种用于在换向序列中的开启期间控制电动机线圈的转换速率的电路。 所公开的电路包括接收换向信号的开关电流镜，并且当其相关联的线圈被驱动时，其向积分缓冲放大器的输入提供镜像电流。 积分缓冲放大器包括具有反馈电容器的放大器和在其输入端连接的电流源，用于降低晶体管关断期间的电压转换速率。 施加到积分缓冲放大器的输入端的镜像电流大于电流源的反射电流，但受到限制，以便减小线圈上的电压。

公开(公告)号：US5550446A

公开(公告)日：1996-08-27

申请号：US316891

申请日：1994-09-30

Applicant: Karl M. Schlager ,  Li-Hsin D. Lu

Inventor： Karl M. Schlager ,  Li-Hsin D. Lu

IPC: H02P6/00 ,  H02P7/00

CPC classification number: H02P6/28

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US5920166A

公开(公告)日：1999-07-06

申请号：US843918

申请日：1997-04-17

Applicant: Karl M. Schlager ,  Massimiliano Brambilla

Inventor： Karl M. Schlager ,  Massimiliano Brambilla

IPC: H02P6/08 ,  H02P6/00 ,  H02P6/10 ,  H02P6/12 ,  H02P6/14 ,  H01R39/46

CPC classification number: H02P6/14 ,  H02P6/10 ,  H02P6/28

Abstract: A circuit for controlling the slew rate at a motor coil during turn-on in a commutation sequence is disclosed. The disclosed circuit includes a switched current mirror that receives the commutation signal, and that provides a mirrored current to the input of an integrating buffer amplifier when its associated coil is to be driven. The integrating buffer amplifier includes an amplifier with a feedback capacitor, and a current source connected at its input, for reducing the voltage slew rate during turn-off of the transistor. The mirrored current applied to the input on the integrating buffer amplifier is greater than that of the current source, but limited so as to reduce the voltage slew at the coil.

Abstract translation: 公开了一种用于在换向序列中的开启期间控制电动机线圈的转换速率的电路。 所公开的电路包括接收换向信号的开关电流镜，并且当其相关联的线圈被驱动时，其向积分缓冲放大器的输入提供镜像电流。 积分缓冲放大器包括具有反馈电容器的放大器和在其输入端连接的电流源，用于降低晶体管关断期间的电压转换速率。 施加到积分缓冲放大器的输入的镜像电流大于电流源的反射电流，但受到限制，以便减小线圈上的电压。

公开(公告)号：US06737908B2

公开(公告)日：2004-05-18

申请号：US10233883

申请日：2002-09-03

Applicant: Michael J. Mottola ,  Karl M. Schlager

Inventor： Michael J. Mottola ,  Karl M. Schlager

IPC: G05F110

CPC classification number: G05F3/267 ,  Y10S323/901

Abstract: A bootstrap reference circuit includes a shunt regulator for generating a reference voltage at a first node, a current source generating a current, and a current mirror coupling the current to the shunt regulator for supplying the shunt regulator. In operation, when the shunt regulator is powering up, the current has an increasing magnitude when a voltage at the first node is less than a predefined voltage value where the predefined voltage value is less than the reference voltage. Furthermore, the current has a decreasing magnitude when the voltage at the first node is greater than the predefined voltage value. In one embodiment, the shunt regulator includes a bandgap reference circuit and the predefined voltage value is less than the bandgap voltage of 1.24 volts.

Abstract translation: 自举参考电路包括用于在第一节点处产生参考电压的分流调节器，产生电流的电流源和将电流耦合到分流调节器以供应分流调节器的电流镜。 在操作中，当并联稳压器上电时，当第一节点处的电压小于预定电压值小于参考电压的预定电压值时，电流具有增加的幅度。 此外，当第一节点处的电压大于预定电压值时，电流具有减小的幅度。 在一个实施例中，并联调节器包括带隙参考电路，并且预定电压值小于1.24伏特的带隙电压。

公开(公告)号：US5572096A

公开(公告)日：1996-11-05

申请号：US250027

申请日：1994-05-27

Applicant: Karl M. Schlager

Inventor： Karl M. Schlager

IPC: H02P6/12 ,  H02P6/14 ,  H02P7/00

CPC classification number: H02P6/14

Abstract: A circuit for clamping the voltage spike of a stator coil winding of a brushless direct current motor is disclosed. The circuit uses a comparator to monitor the voltage on a stator winding. When a voltage spike is detected, the comparator turns on the stator winding driver transistor to clamp the voltage spike. The comparator can be designed to trigger at a desired threshold voltage so that the threshold can optimized. Additionally, the comparator can be selectively disabled to trigger when voltage spikes are anticipated.

Abstract translation: 公开了一种用于钳位无刷直流电动机的定子线圈绕组的电压尖峰的电路。 该电路使用比较器来监视定子绕组上的电压。 当检测到电压尖峰时，比较器接通定子绕组驱动晶体管以钳位电压尖峰。 比较器可以被设计为以期望的阈值电压触发，使得阈值可以被优化。 此外，当预期电压尖峰时，可以选择性地禁止比较器触发。