公开(公告)号：US06528987B1

公开(公告)日：2003-03-04

申请号：US09595953

申请日：2000-06-19

申请人： John Blake ,  David Hanrahan ,  Kohji Yoshida

发明人： John Blake ,  David Hanrahan ,  Kohji Yoshida

IPC分类号： G01P3489

CPC分类号： H05K7/20209 ,  G01P3/489 ,  G06F1/206

摘要： An operating circuit (1) for controlling the speed of a cooling fan motor (3) for computer cabinetry (7), and for determining an under-speed condition in the fan motor (3) comprises a control circuit (15) which controls a variable output signal generator circuit (18) for outputting a pulse width modulated signal corresponding to the desired fan speed for switching a switching circuit (8) in a power supply circuit of the fan motor (3) for pulse width modulating the power supply to the fan motor (3). A monitoring resistor (R1), a capacitor (C1) and a circuit (12) provides a tachometer signal to the operating circuit (1). A gate circuit (22) gates the second and fourth pulses of the tachometer signal to a counter (20) which counts clock pulses from a clock signal generating circuit (19) between the rising edges of the second and fourth pulses which are in turn stored in a register (23) for comparison with a reference count by a comparator (25). The comparator (25) outputs an alert signal in the event of the count in the register (23) exceeding the reference count indicating under-speed of the fan. The control circuit (15) controls the signal generator circuit (18) for holding the pulse width modulated signal outputted to the switching circuit (8) on during a duty cycle between the rising edges of the second and fourth pulses of the tachometer signal so that the tachometer signal remains available until the fan speed has been determined.

摘要翻译： 一种用于控制计算机橱柜（7）的冷却风扇马达（3）的速度并用于确定风扇马达（3）中的低速状况的操作电路（1），包括控制电路（15） 可变输出信号发生器电路（18），用于输出对应于期望的风扇速度的脉宽调制信号，用于切换风扇电动机（3）的电源电路中的开关电路（8），用于将电源的脉冲宽度调制到 风扇电机（3）。 监视电阻器（R1），电容器（C1）和电路（12）向操作电路（1）提供转速计信号。 门电路（22）将转速计信号的第二和第四脉冲门控到计数器（20），该计数器（20）在时钟信号产生电路（19）的时钟脉冲之间计数第二和第四脉冲的上升沿之间， 在用于与比较器（25）的参考计数进行比较的寄存器（23）中。 比较器（25）在寄存器（23）中的计数超过表示风扇低速的参考计数的情况下输出报警信号。 控制电路（15）控制信号发生器电路（18），用于在转速计信号的第二和第四脉冲的上升沿之间的占空比期间保持输出到开关电路（8）的脉冲宽度调制信号，使得 转速计信号保持可用，直到确定风扇速度。

公开(公告)号：US20050258789A1

公开(公告)日：2005-11-24

申请号：US11189149

申请日：2005-07-25

申请人： Robin Getz ,  David Hanrahan

发明人： Robin Getz ,  David Hanrahan

IPC分类号： H02P6/06 ,  H02P6/08 ,  H02P7/06

CPC分类号： H02P6/08

摘要： A drive circuit for a brushless DC motor includes a switch constructed and arranged to drive the motor with a pulse signal responsive to a control signal, and control circuitry coupled to the switch and constructed and arranged to generate the control signal responsive to rotor position information from the motor so as to synchronize the pulse signal to the rotor position. A current sensing device can be used to provide the rotor position information to the control circuitry by sensing current flowing through the motor.

公开(公告)号：US06255973B1

公开(公告)日：2001-07-03

申请号：US09383447

申请日：1999-08-26

申请人： Matt Smith ,  David Hanrahan

发明人： Matt Smith ,  David Hanrahan

IPC分类号： H03M100

CPC分类号： H04L12/66

摘要： A system for a providing addresses to each one of a plurality of addressable integrated circuits. The system includes a plurality of address select circuits, each one thereof being coupled to a corresponding one of a corresponding plurality of addressable integrated circuit. Each one of such integrated circuits has an address select pin adapted to receive a signal from the corresponding one of the address select circuits. The signal is indicative of an address for such one of the plurality of addressable integrated circuits. Each one of such address circuit includes a signal source connected to the pin and a circuit for coding such signal source into a selected one of more than three predetermined signal levels. The integrated circuit includes a converter for converting such selected one of the signal levels into a address signal for such one of the integrated circuits during an initial address select mode and for providing conversion of a second signal in the integrated circuit for use by such integrated circuit in processing the second signal fed to such integrated circuit during a subsequent normal operating mode. In one embodiment the converter is an analog to digital converter. The other signal is indicative of temperature. A register is provided for storing the address signal for such one of the integrated circuits.

摘要翻译： 一种用于向多个可寻址集成电路中的每一个提供地址的系统。 该系统包括多个地址选择电路，其中的每一个耦合到对应的多个可寻址集成电路中的对应的一个。 这些集成电路中的每一个具有适于从相应的一个地址选择电路接收信号的地址选择引脚。 信号表示多个可寻址集成电路中的一个的地址。 这种地址电路中的每一个包括连接到引脚的信号源和用于将这种信号源编码为多于三个预定信号电平中选定的一个的电路。 集成电路包括转换器，用于在初始地址选择模式期间将这些信号电平中的这些选择的一个转换为这种集成电路的地址信号，并用于提供集成电路中的第二信号的转换以供该集成电路使用 在随后的正常操作模式期间处理馈送到这种集成电路的第二信号。 在一个实施例中，转换器是模数转换器。 另一个信号表示温度。 提供了一个用于存储这种集成电路之一的地址信号的寄存器。

公开(公告)号：US20090215436A1

公开(公告)日：2009-08-27

申请号：US12037083

申请日：2008-02-25

申请人： Kevin B. Howard ,  Kurtis Van Horn ,  Andrew Pinkman ,  David Hanrahan

发明人： Kevin B. Howard ,  Kurtis Van Horn ,  Andrew Pinkman ,  David Hanrahan

IPC分类号： H04Q7/22

CPC分类号： H04W8/30

摘要： A fully integrated completely wireless mobile media system for digital signage applications receives content from a mobile telephone network. The received content is wirelessly distributed to point of sale locations and wireless local hotspots via IEEE 802.11(n) or later communications protocol. Audio and high definition video are streamed over MIMO RF technology incorporating JPEG2000 or later compression algorithms providing transmission quality up to or better than wired connectivity over a wireless link. The system requires no wired communications infrastructure such that the entire system may travel, or advertising displays are readily relocatable within the retail environment. Media content can be unicast for point to point (single endpoint) or multicast for multi-endpoint delivery. The system supports wireless local hotspot connectivity.

摘要翻译： 用于数字标牌应用的完全集成的完全无线移动媒体系统从移动电话网络接收内容。 接收到的内容通过IEEE 802.11（n）或更高版本的通信协议无线地分发到销售点位置和无线本地热点。 音频和高分辨率视频通过MIMO RF技术进行流式传输，并结合JPEG2000或更高版本的压缩算法，通过无线链路提供高达或优于有线连接的传输质量。 该系统不需要有线通信基础设施，使得整个系统可以行进，或者广告显示器在零售环境中容易重新定位。 媒体内容可以是点对点（单个端点）的单播或多端点传送的多播。 该系统支持无线本地热点连接。