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公开(公告)号：US20160033545A1
公开(公告)日：2016-02-04
申请号：US14883164
申请日：2015-10-14
Applicant: Linear Technology Corporation
Inventor： Jeffrey Lynn Heath , Harry Joseph Kleeburg , Heath Dixon Stewart
Abstract: An anemometer and method for analyzing fluid flow is described. In one embodiment, a transistor sensor is heated by applying power to cause its base-emitter junction to rise from an ambient first temperature to a second temperature. The power is removed, and the Vbe is measured at intervals as the junction cools. The Vbe equates to a temperature of the junction. The temperature exponentially decreases, and the time constant of the decay corresponds to the fluid flow velocity. A best fit curve analysis is performed on the temperature decay curve, and the time constant of the exponential decay is derived by a data processor. A transfer function correlates the time constant to the fluid flow velocity. The transistor is thermally coupled to a metal rod heat sink extending from the package, and the characteristics of the rod are controlled to adjust the performance of the anemometer.
Abstract translation: 描述了用于分析流体流动的风速计和方法。 在一个实施例中，通过施加功率来加热晶体管传感器，以使其基极 - 发射极结从环境温度升至第二温度。 功率被去除，并且Vbe在接头冷却时间隔测量。 Vbe等于交界处的温度。 温度指数下降，衰减的时间常数对应于流体流速。 对温度衰减曲线进行最佳拟合曲线分析，数据处理器得出指数衰减的时间常数。 传递函数将时间常数与流体流速相关联。 晶体管热耦合到从封装延伸的金属棒散热器，并且控制棒的特性以调节风速计的性能。
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公开(公告)号：US09851372B2
公开(公告)日：2017-12-26
申请号：US14883164
申请日：2015-10-14
Applicant: Linear Technology Corporation
Inventor： Jeffrey Lynn Heath , Harry Joseph Kleeburg , Heath Dixon Stewart
Abstract: An anemometer and method for analyzing fluid flow is described. In one embodiment, a transistor sensor is heated by applying power to cause its base-emitter junction to rise from an ambient first temperature to a second temperature. The power is removed, and the Vbe is measured at intervals as the junction cools. The Vbe equates to a temperature of the junction. The temperature exponentially decreases, and the time constant of the decay corresponds to the fluid flow velocity. A best fit curve analysis is performed on the temperature decay curve, and the time constant of the exponential decay is derived by a data processor. A transfer function correlates the time constant to the fluid flow velocity. The transistor is thermally coupled to a metal rod heat sink extending from the package, and the characteristics of the rod are controlled to adjust the performance of the anemometer.
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Patent Agency Ranking
公开(公告)号：US09660456B2
公开(公告)日：2017-05-23
申请号：US13657412
申请日：2012-10-22
Applicant: LINEAR TECHNOLOGY CORPORATION
Inventor： David McLean Dwelley , Jeffrey Lynn Heath
CPC classification number: H02J4/00 , H04L12/10 , H04L12/40045
Abstract: Technique for providing power to a powered device (PD) over a cable having first and second sets of twisted pairs, such as signal pairs and spare pairs. Power Sourcing Equipment (PSE) circuitry is coupled via a first switch to the second set, e.g. to the spare pairs. A switch control circuit turns the first switch off to enable the PSE circuitry to perform a prescribed operation in connection with the PD over only the first set, e.g. over the signal pairs, and turns the first switch on to enable the PSE circuitry to perform the prescribed operation in connection with the PD over the first and second sets.
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公开(公告)号：US09209981B2
公开(公告)日：2015-12-08
申请号：US14150150
申请日：2014-01-08
Applicant: Linear Technology Corporation
Inventor： Jeffrey Lynn Heath , David Dwelley , Heath Dixon Stewart , Michael Thomas Paul
IPC: G06F1/26 , H04L12/10 , H04L12/40 , H04L25/02 , H04L12/931
CPC classification number: H04L12/10 , G06F1/26 , G06F1/266 , H04L12/40045 , H04L25/0272 , H04L49/40
Abstract: Power Sourcing Equipment (PSE) provides a PoE supply voltage over data wires to a Powered Device (PD). A PSE controller controls a first FET that couples the PoE voltage to the data wire pairs and controls a second FET that couples the data wire pairs to the spare wire pairs. Upon powering up, the PSE controller keeps the two FETs open and performs a detection routine on any devices connected to the data pairs and spare pairs. If a PoE-compatible PD is detected as being coupled to the data pairs, the first switch is closed. If it is determined that the PoE voltage should also be coupled to the spare pairs, the second FET is also closed. The method prevents the PoE voltage from being applied to the spare pairs when the device connected to the spare pairs is not PoE compatible and maintains backwards compliance with IEEE PoE PDs.
Abstract translation: 电源设备（PSE）通过数据线向受电设备（PD）提供PoE电源电压。 PSE控制器控制将PoE电压耦合到数据线对的第一FET，并控制将数据线对耦合到备用线对的第二FET。 上电时，PSE控制器保持两个FET打开，并在连接到数据对和备用对的任何设备上执行检测程序。 如果检测到与PoE兼容的PD被耦合到数据对，则第一开关被关闭。 如果确定PoE电压也应耦合到备用对，则第二FET也关闭。 当连接到备用对的设备不兼容PoE并保持与IEEE PoE PD的向后兼容时，该方法可防止PoE电压施加到备用对。
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公开(公告)号：US20150019884A1
公开(公告)日：2015-01-15
申请号：US14288103
申请日：2014-05-27
Applicant: Linear Technology Corporation
Inventor： Ryan Charles Huff , Jeffrey Lynn Heath , Kaung Zin Htoo , Kirk Tzukai Su
IPC: H04L12/10
Abstract: A Powered Device (PD) in a PoE system has two input channels, each being coupled to a separate Power Sourcing Equipment (PSE) for increased reliability. A first PD controller is coupled to the first channel to perform hand-shaking and closes a first Power Good (PWRGD) switch when the PoE voltage is detected on the first channel. A second PD controller is coupled to the second channel to perform hand-shaking and closes a second PWRGD switch when the PoE voltage is detected on the second channel. A diode bridge couples both channels to a single regulating power supply that supplies power to a load. Auxiliary switches are controlled by the PWRGD signals so that only the first channel or the second channel is coupled to the diode bridge in the event that both channels receive the respective PoE voltages. Therefore, hot standby is provided using only one power supply.
Abstract translation: PoE系统中的受电设备（PD）具有两个输入通道，每个输入通道耦合到单独的电源设备（PSE），以提高可靠性。 当在第一通道上检测到PoE电压时，第一PD控制器耦合到第一通道以执行握手并闭合第一电源（PWRGD）开关。 当在第二通道上检测到PoE电压时，第二PD控制器耦合到第二通道以执行握手并闭合第二PWRGD开关。 二极管桥将两个通道耦合到向负载供电的单个调节电源。 辅助开关由PWRGD信号控制，使得仅在两个通道接收相应的PoE电压的情况下，仅第一通道或第二通道耦合到二极管电桥。 因此，仅使用一个电源提供热备用。
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公开(公告)号：US09419807B2
公开(公告)日：2016-08-16
申请号：US14288103
申请日：2014-05-27
Applicant: Linear Technology Corporation
Inventor： Ryan Charles Huff , Jeffrey Lynn Heath , Kaung Zin Htoo , Kirk Tzukai Su
IPC: G06F1/26 , H04L12/10 , H04L12/931
Abstract: A Powered Device (PD) in a PoE system has two input channels, each being coupled to a separate Power Sourcing Equipment (PSE) for increased reliability. A first PD controller is coupled to the first channel to perform hand-shaking and closes a first Power Good (PWRGD) switch when the PoE voltage is detected on the first channel. A second PD controller is coupled to the second channel to perform hand-shaking and closes a second PWRGD switch when the PoE voltage is detected on the second channel. A diode bridge couples both channels to a single regulating power supply that supplies power to a load. Auxiliary switches are controlled by the PWRGD signals so that only the first channel or the second channel is coupled to the diode bridge in the event that both channels receive the respective PoE voltages. Therefore, hot standby is provided using only one power supply.
Abstract translation: PoE系统中的受电设备（PD）具有两个输入通道，每个输入通道耦合到单独的电源设备（PSE），以提高可靠性。 当在第一通道上检测到PoE电压时，第一PD控制器耦合到第一通道以执行握手并闭合第一电源（PWRGD）开关。 当在第二通道上检测到PoE电压时，第二PD控制器耦合到第二通道以执行握手并闭合第二PWRGD开关。 二极管桥将两个通道耦合到向负载供电的单个调节电源。 辅助开关由PWRGD信号控制，使得仅在两个通道接收相应的PoE电压的情况下，仅第一通道或第二通道耦合到二极管电桥。 因此，仅使用一个电源提供热备用。
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公开(公告)号：US20140372773A1
公开(公告)日：2014-12-18
申请号：US14150150
申请日：2014-01-08
Applicant: Linear Technology Corporation
Inventor： Jeffrey Lynn Heath , David Dwelley , Heath Dixon Stewart , Michael Thomas Paul
IPC: G06F1/26
CPC classification number: H04L12/10 , G06F1/26 , G06F1/266 , H04L12/40045 , H04L25/0272 , H04L49/40
Abstract: Power Sourcing Equipment (PSE) provides a PoE supply voltage over data wires to a Powered Device (PD). A PSE controller controls a first FET that couples the PoE voltage to the data wire pairs and controls a second FET that couples the data wire pairs to the spare wire pairs. Upon powering up, the PSE controller keeps the two FETs open and performs a detection routine on any devices connected to the data pairs and spare pairs. If a PoE-compatible PD is detected as being coupled to the data pairs, the first switch is closed. If it is determined that the PoE voltage should also be coupled to the spare pairs, the second FET is also closed. The method prevents the PoE voltage from being applied to the spare pairs when the device connected to the spare pairs is not PoE compatible and maintains backwards compliance with IEEE PoE PDs.
Abstract translation: 电源设备（PSE）通过数据线向受电设备（PD）提供PoE电源电压。 PSE控制器控制将PoE电压耦合到数据线对的第一FET，并控制将数据线对耦合到备用线对的第二FET。 上电时，PSE控制器保持两个FET打开，并在连接到数据对和备用对的任何设备上执行检测程序。 如果检测到与PoE兼容的PD被耦合到数据对，则第一开关被关闭。 如果确定PoE电压也应耦合到备用对，则第二FET也关闭。 当连接到备用对的设备不兼容PoE并保持与IEEE PoE PD的向后兼容时，该方法可防止PoE电压施加到备用对。
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