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公开(公告)号：US09634844B2
公开(公告)日：2017-04-25
申请号：US14607608
申请日：2015-01-28
Applicant: Linear Technology Corporation
Inventor： Michael Paul , Jeffrey Heath , David Dwelley , Heath Stewart
Abstract: In a method performed by a PoE system, a PSE is able to detect whether a PD is compatible for receiving power via four wire pairs in the standard Ethernet cable. The PSE provides a current limited voltage to a first and second pair of wires in the cable, during a detection phase, to detect a characteristic impedance of the PD. In the PSE, a first resistor is connected to a third wire pair and a second resistor is connected to a fourth wire pair. During the detection phase, the PSE detects the relative currents through the resistors. If the currents are the same, then the PSE knows the PD is able to receive power via the four wire pairs. The PSE then applies the full PoE voltage to the first and second wire pairs and connects the third and fourth wire pairs to a low voltage via a MOSFET.
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2.发明授权Power over ethernet power sourcing equipment provides low voltage output for increased efficiency in low power mode 有权以太网供电设备的电源提供低电压输出，以提高低功耗模式下的效率公开(公告)号：US09535437B1
公开(公告)日：2017-01-03
申请号：US14054516
申请日：2013-10-15
Applicant: Linear Technology Corporation
Inventor： David Dwelley , Jeffrey Heath , Kirk Su
CPC classification number: G05F1/10 , B60R16/03 , G05F1/462 , H04L12/10 , H04L41/0681 , Y02D30/30 , Y02D30/32
Abstract: In a PoE system in an automobile, Power Source Equipment (PSE) is connected to Powered Devices (PDs) to provide data and power via Ethernet wires. When the ignition switch is on, the full PSE voltage, such as 44 volts, is supplied to the PDs, and the voltage is regulated by the PDs to power one or more loads in the PD. During a standby mode, such as when the ignition switch is off, the PSE is controlled to output a lower voltage of, for example, 5 volts, and the voltage is regulated by the PDs to power the loads, such as processors, in a low power standby mode. The voltage regulator in the PD for the low power mode may be an efficient linear regulator, and the voltage regulator in the PD for the full voltage mode may be a switching regulator. Thus, there is improved efficiency.
Abstract translation: 在汽车的PoE系统中，电源设备（PSE）连接到有源设备（PD），以通过以太网电线提供数据和电源。 当点火开关打开时，全部PSE电压（例如44伏特）被提供给PD，并且电压由PD调节以为PD中的一个或多个负载供电。 在待机模式期间，例如当点火开关关闭时，PSE被控制以输出例如5伏特的较低电压，并且电压由PD调节以对负载（例如处理器）供电，在 低功耗待机模式。 用于低功耗模式的PD中的电压调节器可以是高效的线性稳压器，并且用于全电压模式的PD中的稳压器可以是开关稳压器。 因此，提高了效率。
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公开(公告)号：US10122413B2
公开(公告)日：2018-11-06
申请号：US15587324
申请日：2017-05-04
Applicant: Linear Technology Corporation
Inventor： Jeffrey Heath , David Dwelley
Abstract: A PoDL system includes a PSE connected via a wire pair to a PD, where differential data and DC power are transmitted over the same wire pair. Typically, low voltage/current detection and classification routines are required upon every powering up of the system to allow the PD to convey its PoDL requirements to the PSE. Various techniques are described that simplify or obviate such start-up routines or enable increased flexibility for the PoDL system. Such techniques include: ways to specify a particular PD operating voltage; ways to disable the PD's UVLO circuit during such routines; using opposite polarity voltages for the two routines; using voltage limiters or surge protectors to convey the PoDL information; detecting loop resistance; using a PSE memory to store previous results of the routines; and powering the PD communication circuit using the wire pair while the PD load is powered by an alternate power source.
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公开(公告)号：US09859951B2
公开(公告)日：2018-01-02
申请号：US14552164
申请日：2014-11-24
Applicant: Linear Technology Corporation
Inventor： Jeffrey Heath , David Dwelley
CPC classification number: H04B3/56 , H02J3/12 , H04L12/10 , H04L12/40045
Abstract: A PoDL system includes a PSE connected via a wire pair to a PD, where differential data and DC power are transmitted over the same wire pair. Typically, low voltage/current detection and classification routines are required upon every powering up of the system to allow the PD to convey its PoDL requirements to the PSE. Various techniques are described that simplify or obviate such start-up routines or enable increased flexibility for the PoDL system. Such techniques include: ways to specify a particular PD operating voltage; ways to disable the PD's UVLO circuit during such routines; using opposite polarity voltages for the two routines; using voltage limiters or surge protectors to convey the PoDL information; detecting loop resistance; using a PSE memory to store previous results of the routines; and powering the PD communication circuit using the wire pair while the PD load is powered by an alternate power source.
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公开(公告)号：US20150091391A1
公开(公告)日：2015-04-02
申请号：US14501517
申请日：2014-09-30
Applicant: Linear Technology Corporation
Inventor： David Dwelley , Jeffrey Heath , Kirk Su , Ryan Huff
CPC classification number: G05B11/01 , H02J3/00 , H04L12/10 , Y10T307/858
Abstract: In a method performed by a PoE system, a PSE provides data and operating voltage over Ethernet wires to a PD. Before the full PoE voltage is supplied, the PSE generates a low current signal received by the PD. A circuit in the PD, connected across its input terminals, has a characteristic analog response to the PSE signal corresponding to the PD's PoE requirements, such as whether the PD is a Type 1 or Type 2 PD. The circuit may be a certain value capacitor, zener diode, resistor, or other circuit. The PSE may generate a fixed current, fixed voltage, or time varying signal. Upon the PSE sensing the magnitude of the analog signal response at a particular time, the PSE associates the response with the PoE requirements of the PD. The PSE then applies the full PoE voltage in accordance with the PD's PoE requirements.
Abstract translation: 在PoE系统执行的方法中，PSE通过以太网线将数据和工作电压提供给PD。 在提供完整的PoE电压之前，PSE产生PD接收到的低电流信号。 连接在其输入端子上的PD中的电路具有对应于PD的PoE要求的PSE信号的特征模拟响应，例如PD是1型或2型PD。 该电路可以是一定值电容器，齐纳二极管，电阻器或其他电路。 PSE可以产生固定电流，固定电压或时变信号。 在PSE感测特定时间的模拟信号响应的幅度时，PSE将响应与PD的PoE要求相关联。 PSE然后根据PD的PoE要求施加完整的PoE电压。
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Patent Agency Ranking
6.发明申请公开(公告)号：US20170237575A1
公开(公告)日：2017-08-17
申请号：US15587324
申请日：2017-05-04
Applicant: Linear Technology Corporation
Inventor： Jeffrey Heath , David Dwelley
CPC classification number: H04B3/56 , H02J3/12 , H04L12/10 , H04L12/40045
Abstract: A PoDL system includes a PSE connected via a wire pair to a PD, where differential data and DC power are transmitted over the same wire pair. Typically, low voltage/current detection and classification routines are required upon every powering up of the system to allow the PD to convey its PoDL requirements to the PSE. Various techniques are described that simplify or obviate such start-up routines or enable increased flexibility for the PoDL system. Such techniques include: ways to specify a particular PD operating voltage; ways to disable the PD's UVLO circuit during such routines; using opposite polarity voltages for the two routines; using voltage limiters or surge protectors to convey the PoDL information; detecting loop resistance; using a PSE memory to store previous results of the routines; and powering the PD communication circuit using the wire pair while the PD load is powered by an alternate power source.
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7.发明授权Power over Ethernet system where power sourcing equipment detects actual voltage at powered device 有权以太网供电系统，其中电源设备检测受电设备的实际电压公开(公告)号：US09488997B1
公开(公告)日：2016-11-08
申请号：US14054440
申请日：2013-10-15
Applicant: Linear Technology Corporation
Inventor： David Dwelley , Jeffrey Heath , Ryan Huff
CPC classification number: G05F1/10 , B60R16/03 , G05F1/462 , H04L12/10 , H04L41/0681 , Y02D30/30 , Y02D30/32
Abstract: A Power Over Ethernet (PoE) system, or other power over data lines system, includes Power Sourcing Equipment (PSE) providing combined data and voltage over wires to a Powered Device (PD). Since cable length and PD load currents may not be known, there is a variable voltage drop along the cable between the PSE and PD. Prior to the PD being fully powered up, a test is performed by the PSE to determine the actual resistance or voltage drop of the cable, and the results are stored in a memory accessed by the PSE upon powering up. The PSE uses the stored information to adjust its voltage source to provide a target voltage at the PD input during full power operation. This may obviate the need for a voltage regulator at the PD. The test may only be conducted when the PSE is initially powered up or may be conducted periodically.
Abstract translation: 以太网供电（PoE）系统或其他数据线供电系统包括电源设备（PSE），通过电源将有源数据和电压提供给有源设备（PD）。 由于电缆长度和PD负载电流可能未知，PSE和PD之间沿着电缆存在可变的电压降。 在PD完全上电之前，由PSE执行测试以确定电缆的实际电阻或电压降，并且将结果存储在PSE上电时访问的存储器中。 PSE使用存储的信息来调整其电压源，以在全功率运行期间在PD输入端提供目标电压。 这可以避免在PD处需要电压调节器。 该测试只能在PSE最初上电或定期进行时进行。
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公开(公告)号：US20150215131A1
公开(公告)日：2015-07-30
申请号：US14607608
申请日：2015-01-28
Applicant: Linear Technology Corporation
Inventor： Michael Paul , Jeffrey Heath , David Dwelley , Heath Stewart
Abstract: In a method performed by a PoE system, a PSE is able to detect whether a PD is compatible for receiving power via four wire pairs in the standard Ethernet cable. The PSE provides a current limited voltage to a first and second pair of wires in the cable, during a detection phase, to detect a characteristic impedance of the PD. In the PSE, a first resistor is connected to a third wire pair and a second resistor is connected to a fourth wire pair. During the detection phase, the PSE detects the relative currents through the resistors. If the currents are the same, then the PSE knows the PD is able to receive power via the four wire pairs. The PSE then applies the full PoE voltage to the first and second wire pairs and connects the third and fourth wire pairs to a low voltage via a MOSFET.
Abstract translation: 在PoE系统执行的方法中，PSE能够通过标准以太网电缆中的四线对来检测PD是否兼容接收电力。 PSE在检测阶段向电缆中的第一和第二对导线提供电流限制电压，以检测PD的特性阻抗。 在PSE中，第一电阻器连接到第三线对，并且第二电阻器连接到第四线对。 在检测阶段，PSE检测通过电阻的相对电流。 如果电流相同，则PSE知道PD能够通过四条线对接收电力。 PSE然后将全PoE电压施加到第一和第二线对，并且通过MOSFET将第三和第四线对连接到低电压。
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公开(公告)号：US10261477B2
公开(公告)日：2019-04-16
申请号：US15863571
申请日：2018-01-05
Applicant: Linear Technology Corporation
Inventor： David Dwelley , Jeffrey Heath , Kirk Su , Ryan Huff
Abstract: In a method performed by a PoE system, a PSE provides data and operating voltage over Ethernet wires to a PD. Before the full PoE voltage is supplied, the PSE generates a low current signal received by the PD. A circuit in the PD, connected across its input terminals, has a characteristic analog response to the PSE signal corresponding to the PD's PoE requirements, such as whether the PD is a Type 1 or Type 2 PD. The circuit may be a certain value capacitor, zener diode, resistor, or other circuit. The PSE may generate a fixed current, fixed voltage, or time varying signal. Upon the PSE sensing the magnitude of the analog signal response at a particular time, the PSE associates the response with the PoE requirements of the PD. The PSE then applies the full PoE voltage in accordance with the PD's PoE requirements.
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公开(公告)号：US10256867B2
公开(公告)日：2019-04-09
申请号：US15587315
申请日：2017-05-04
Applicant: Linear Technology Corporation
Inventor： Jeffrey Heath , David Dwelley
Abstract: A PoDL system includes a PSE connected via a wire pair to a PD, where differential data and DC power are transmitted over the same wire pair. Typically, low voltage/current detection and classification routines are required upon every powering up of the system to allow the PD to convey its PoDL requirements to the PSE. Various techniques are described that simplify or obviate such start-up routines or enable increased flexibility for the PoDL system. Such techniques include: ways to specify a particular PD operating voltage; ways to disable the PD's UVLO circuit during such routines; using opposite polarity voltages for the two routines; using voltage limiters or surge protectors to convey the PoDL information; detecting loop resistance; using a PSE memory to store previous results of the routines; and powering the PD communication circuit using the wire pair while the PD load is powered by an alternate power source.
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