公开(公告)号：US06552889B1

公开(公告)日：2003-04-22

申请号：US09908178

申请日：2001-07-17

申请人： John Huang ,  Hamza Yilmaz ,  Mohamed N. Darwish ,  Wharton McDaniel ,  Kyle Terrill ,  Peter Tu Dang

发明人： John Huang ,  Hamza Yilmaz ,  Mohamed N. Darwish ,  Wharton McDaniel ,  Kyle Terrill ,  Peter Tu Dang

IPC分类号： H02H300

CPC分类号： H03K17/0822

摘要： A power FET and a replica FET on a semiconductor chip coupled to a logic control circuit on a second semiconductor chip within a single housing. A power FET and a scaled down replica of the power FET are disposed on a semiconductor chip. The power FET is used as a switch to couple a DC power source to a load. A fraction of the power FET drain current passes through the replica FET and an external resistance. When the voltage across the external resistance exceeds a maximum value based upon the maximum allowable power FET drain current, the logic control circuit enters into a pulsed gate (PG) mode of operation. The first step in the PG mode is to switch both FETs into a non-conducting state for a predefined period of time. After this time period, a ramp voltage applied between gate and source of both FETs will switch them back into a current conducting state while holding the power FET drain current below its upper limit in the presence of a high capacitance load. If the voltage across the external resistance increases above the maximum, the PG mode of operation continues. PG mode of operation ceases and normal operation follows when the external resistance voltage remains below the established maximum. The combination of predefined nonconducting time and maximum drain current ensures operation of the power FET below maximum power dissipation limits. The PG mode of operation eliminates the need for additional temperature and thermal control circuits.

摘要翻译： 半导体芯片上的功率FET和复制FET耦合到单个壳体内的第二半导体芯片上的逻辑控制电路。 功率FET的功率FET和缩小的复制品设置在半导体芯片上。 功率FET用作将直流电源耦合到负载的开关。 功率FET漏极电流的一部分通过复制FET和外部电阻。 当外部电阻两端的电压超过最大容许功率FET漏极电流的最大值时，逻辑控制电路进入脉冲门（PG）工作模式。 PG模式的第一步是将两个FET切换到非导通状态一段预定的时间。 在这个时间段之后，施加在两个FET的栅极和源极之间的斜坡电压将在高电容负载存在的同时将功率FET漏极电流保持在其上限以下，将其切换回导通状态。 如果外部电阻两端的电压增加到最大值以上，则PG模式继续。 当外部电阻保持低于建立的最大值时，PG模式停止，正常操作。 预定义的非导通时间和最大漏极电流的组合确保功率FET的功耗低于最大功耗限制。 PG操作模式无需额外的温度和热控制电路。

公开(公告)号：US4712030A

公开(公告)日：1987-12-08

申请号：US930393

申请日：1986-11-14

申请人： Bryan L. Lakin ,  William P. Wharton McDaniel

发明人： Bryan L. Lakin ,  William P. Wharton McDaniel

IPC分类号： H02K11/04 ,  F01P1/06 ,  H02K9/00

CPC分类号： H02K11/33 ,  Y10T29/49824 ,  Y10T29/49995 ,  Y10T29/53283

摘要： A generally rectangular heat sink is mounted in a conduit box by tabs which are deformed to fit within channels along opposite edges of the heat sink. An access hole in the side of the conduit box and aligned with the channel permits a pin to be inserted therethrough to push the tabs out of the channel and release the heat sink and PC board from the conduit box.

摘要翻译： 大体上矩形的散热器通过翼片安装在导管箱中，突片被变形以沿着散热器的相对边缘配合在通道内。 导管箱侧面与入口对准的通孔允许销插入其中以将卡舌推出通道并从导管箱中释放散热器和PC板。

公开(公告)号：US4365187A

公开(公告)日：1982-12-21

申请号：US150202

申请日：1980-05-15

申请人： Wharton McDaniel ,  Fred A. Brown ,  Donald Thompson

发明人： Wharton McDaniel ,  Fred A. Brown ,  Donald Thompson

IPC分类号： H02K29/08 ,  H02P6/08 ,  H02K29/00

CPC分类号： H02K29/08

摘要： A D.C. brushless motor with a permanent magnet rotor employs Hall switches to effect commutation. The rotor magnets are of a greater axial length than the stator stack and the Hall switches are mounted on a printed circuit panel within the motor frame so as to be actuated by the fringe flux from the portion of a rotor magnet extending beyond the stator stack. The pole faces of the stator stack are stepped to assure proper starting and direction of rotation. A voltage regulating circuit forming part of the commutating arrangement on the printed circuit panel enables the same circuit to be used for a range of stator energizing voltages.

摘要翻译： 具有永磁转子的直流无刷电动机采用霍尔开关来实现换向。 转子磁体具有比定子叠层更大的轴向长度，并且霍尔开关安装在电动机框架内的印刷电路板上，以便通过来自延伸超过定子叠层的转子磁体部分的边缘磁通来驱动。 定子叠片的极面是阶梯式的，以确保正确的启动和旋转方向。 形成印刷电路板上的整流装置的一部分的电压调节电路使得能够在一定范围的定子通电电压中使用相同的电路。