专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US6037732A Intelligent power management for a variable speed fan 失效
标题翻译：变速风扇的智能电源管理
公开(公告)号：US6037732A
公开(公告)日：2000-03-14
申请号：US63072
申请日：1998-04-21
申请人： Donald E. Alfano , Joseph J. Judkins, III , Quoi V. Huynh , Sang T. Ngo
发明人： Donald E. Alfano , Joseph J. Judkins, III , Quoi V. Huynh , Sang T. Ngo
IPC分类号： G05D23/19 , G05B5/00
CPC分类号： G05D23/1912 , Y10S388/903
摘要： A method for controlling the operation of a brushless DC fan for cooling heat generating components of a system is provided. The method includes providing a system temperature signal indicative of a system temperature and providing an intelligent shutdown enable signal. The system temperature signal is compared with a shutdown temperature signal if the intelligent shutdown enable signal has a first value. The shutdown temperature signal is representative of a shutdown temperature value. The fan is operated at a generally temperature proportional speed after comparing the system temperature signal with the shutdown temperature signal if the system temperature as indicated by the system temperature signal is greater than the shutdown temperature value as indicated by the shutdown temperature signal. A shutdown mode is entered by the fan after comparing the system temperature signal with the shutdown temperature signal if the system temperature as indicated by the system temperature signal is less than the shutdown temperature value as indicated by the shutdown temperature signal. The system temperature signal is compared with the shutdown temperature signal after entering the shutdown mode by the fan. Operation of the fan is initiated if the system temperature as indicated by the system temperature signal is greater than the shutdown temperature value as indicated by the shutdown temperature signal and the fan is in the shutdown mode.
摘要翻译：提供了一种用于控制用于冷却系统的发热部件的无刷DC风扇的操作的方法。该方法包括提供指示系统温度并提供智能关机使能信号的系统温度信号。如果智能关机使能信号具有第一值，则将系统温度信号与停机温度信号进行比较。停机温度信号代表关机温度值。如果由系统温度信号指示的系统温度大于关闭温度信号所指示的关机温度值，则将系统温度信号与停机温度信号进行比较后，风扇以大致温度比例速度运行。如果系统温度信号指示的系统温度低于关机温度信号所示的关机温度值，则将风扇信号与关机温度信号进行比较后，风扇进入关机模式。系统温度信号与风扇进入关机模式后的关机温度信号进行比较。如系统温度信号所示的系统温度大于关机温度信号所示的关机温度值，风扇处于关机模式，则开始运行风扇。

2. 发明授权

US5283579A Digital to analog converter having high multiplying bandwidth 失效
标题翻译：具有高乘法带宽的数模转换器
公开(公告)号：US5283579A
公开(公告)日：1994-02-01
申请号：US847458
申请日：1992-03-06
申请人： Ali Tasdighi , Roger A. Levinson , Quoi V. Huynh , John M. Caruso
发明人： Ali Tasdighi , Roger A. Levinson , Quoi V. Huynh , John M. Caruso
IPC分类号： H03M1/68 , H03M1/76 , H03M1/80 , H03M1/66
CPC分类号： H03M1/687 , H03M1/765 , H03M1/808
摘要： A digital to analog converter (DAC) incorporates a novel subranging voltage output DAC that delivers high multiplying bandwidth while consuming low power and requires small silicon area. The higher order digital input bits (MSBS) select a voltage range (VMSB) from a first resistor divider DAC network. The VMSB is then applied to the input of a small high speed low power differential input single ended output LSB programmable attenuator amplifier. Transistor follower devices effectively buffer the MSB section to the LSB section and increase bandwidth and speed of operation as well as permitting multichannel sharing of a single precision MSB voltage divider network.
摘要翻译：数模转换器（DAC）集成了一种新颖的基极电压输出DAC，可在消耗低功耗的同时提供高倍增带宽，并需要较小的硅面积。高阶数字输入位（MSBS）从第一个电阻分压器DAC网络中选择一个电压范围（VMSB）。然后将VMSB应用于小型高速低功耗差分输入单端输出LSB可编程衰减放大器的输入。晶体管跟随器件有效地将MSB部分缓冲到LSB部分，并增加了带宽和运行速度，并允许单个精度MSB分压器网络的多通道共享。

3. 发明授权

US6054823A Verification of fan operation 失效
标题翻译：风扇运行验证
公开(公告)号：US6054823A
公开(公告)日：2000-04-25
申请号：US81309
申请日：1998-05-19
申请人： Jerry Collings , Chuong Nguyen , Joseph James Judkins, III , Donald E. Alfano , Ali Tasdighi , Quoi V. Huynh , Sang T. Ngo
发明人： Jerry Collings , Chuong Nguyen , Joseph James Judkins, III , Donald E. Alfano , Ali Tasdighi , Quoi V. Huynh , Sang T. Ngo
IPC分类号： F04D27/02 , H02H7/093 , H01R39/46
CPC分类号： H02H7/093 , F04D27/008
摘要： An apparatus for sensing the rotation of a brushless DC fan includes the fan and a sense/driver circuit and a capacitance. The sense/driver circuit is coupled to the fan to receive a sense input signal including a fluctuating electrical effect caused by fan commutation events. The sense/driver circuit processes the sense input signal to generate a sense output signal indicative of fan operation. The sense/driver circuit includes an integrated circuit. The integrated circuit includes a sense input pin, a ground return pin, a driver circuit, an integrated filter portion, a filter pin and a level detecting circuit. The capacitance is coupled to the filter pin to provide a filter with the integrated filter portion. The driver circuit includes a control terminal, a first current handling terminal coupled to the sense input pin and a second current handling terminal coupled to provide a ground return pat. The integrated filter portion includes a filter input coupled to at least one of the first and second current handling terminals of the driver circuit, and a filter output for providing a filter output signal to the level detecting circuit. The level detecting circuit generates the sense output signal from the filter output signal. The filter derives the filter output signal indicative of the fan commutation events responsive to receiving a signal at the sense input pin.
摘要翻译：用于感测无刷直流风扇的旋转的装置包括风扇和感测/驱动器电路和电容。感测/驱动器电路耦合到风扇以接收包括由风扇换向事件引起的波动电效应的感测输入信号。感测/驱动电路处理感测输入信号以产生指示风扇操作的感测输出信号。感测/驱动电路包括集成电路。集成电路包括感测输入引脚，接地返回引脚，驱动器电路，集成滤波器部分，滤波器引脚和电平检测电路。电容耦合到滤波器引脚以提供具有集成滤波器部分的滤波器。驱动器电路包括控制端子，耦合到感测输入引脚的第一电流处理端子和耦合以提供接地回路的第二电流处理端子。集成滤波器部分包括耦合到驱动器电路的第一和第二电流处理终端中的至少一个的滤波器输入和用于向电平检测电路提供滤波器输出信号的滤波器输出。电平检测电路从滤波器输出信号产生感测输出信号。响应于在感测输入引脚处接收到信号，滤波器导出指示风扇换向事件的滤波器输出信号。

4. 发明授权

US6040668A Monolithic fan controller 失效
标题翻译：整体风扇控制器
公开(公告)号：US6040668A
公开(公告)日：2000-03-21
申请号：US749864
申请日：1996-11-14
申请人： Quoi V. Huynh , Sang T. Ngo , Joseph James Judkins, III , Donald E. Alfano
发明人： Quoi V. Huynh , Sang T. Ngo , Joseph James Judkins, III , Donald E. Alfano
IPC分类号： G05D23/19 , G05B5/00
CPC分类号： G05D23/1912 , Y10S388/934
摘要： Disclosed herein is a monolithic fan controller circuit which provides the following features: a special start-up routine for the fan; a fan fault detector; a thermal fault detector; an automatic speed controller; a minimum speed controller; a routine for attempting to clear temporary fan faults; and a controllable drive signal frequency. A start-up control circuit provides an initial high duty-cycle kick to the fan in order to initiate the rotation of the fan. A temperature sensor, which may be external or internal to the monolithic fan controller, supplies a signal which is proportional to measured temperature. This signal is used to control the output pulse width of a pulse-width modulator (PWM) or control the frequency of a pulse frequency modulator (PFM). The PWM or PFM output signal regulates the speed of the brushless (or brush) DC fan motor. In a preferred embodiment, the monolithic fan controller has 8 pins.
摘要翻译：本文公开了一种单片风扇控制器电路，其提供以下特征：风扇的特殊启动程序; 风扇故障检测器; 热故障检测器; 自动速度控制器; 最小速度控制器试图清除临时风扇故障的例行程序; 和可控的驱动信号频率。启动控制电路为风扇提供初始高占空比踢脚，以启动风扇的旋转。可以在单片风扇控制器外部或内部的温度传感器提供与测量温度成比例的信号。该信号用于控制脉冲宽度调制器（PWM）的输出脉冲宽度或控制脉冲频率调制器（PFM）的频率。 PWM或PFM输出信号调节无刷（或刷式）直流风扇电机的速度。在优选实施例中，单片风扇控制器具有8个引脚。

5. 发明授权

US5592167A Analog-digital converter using current controlled voltage reference 失效
标题翻译：模数转换器采用电流控制参考电压
公开(公告)号：US5592167A
公开(公告)日：1997-01-07
申请号：US325716
申请日：1994-10-19
申请人： John M. Caruso , Quoi V. Huynh , Roger A. Levinson
发明人： John M. Caruso , Quoi V. Huynh , Roger A. Levinson
IPC分类号： H03M1/10 , H03M1/36
CPC分类号： H03M1/1028 , H03M1/365
摘要： A current driven span voltage source for use in an analog to digital converter includes a zero reference resistor serially connected with a resistor ladder. A first current source selectively passes a part of a first current through the resistor ladder to establish a span (gain) voltage range, and a second current source selectively passes a part of a second current through the zero reference resistor to establish a zero reference voltage for the span voltage range. The controlled current sources increase speed, reduce power and thermal noise, and improve temperature related performance as compared with voltage driven span and reference sources using operational amplifiers.
摘要翻译：用于模数转换器的电流驱动跨接电压源包括与电阻梯级串联连接的零参考电阻。第一电流源选择性地使第一电流的一部分通过电阻梯以建立跨度（增益）电压范围，并且第二电流源选择性地使一部分第二电流通过零参考电阻器以建立零参考电压对于跨度电压范围。与使用运算放大器的电压驱动量程和参考源相比，受控电流源可提高速度，降低功耗和热噪声，并提高温度相关性能。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式