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

IPC: G06F1/26 ,  H04L12/10

CPC classification number: H04L12/10 ,  G06F1/26

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.

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

IPC: G05F1/10 ,  H04L12/24 ,  B60R16/03 ,  H04L12/10

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。

公开(公告)号：US20160054777A1

公开(公告)日：2016-02-25

申请号：US14831632

申请日：2015-08-20

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Andrew J. Gardner

IPC: G06F1/32 ,  G06F13/42 ,  G06F13/40 ,  G06F1/26

CPC classification number: G06F1/3206 ,  G06F1/263 ,  G06F1/3287 ,  G06F1/3296 ,  G06F13/4022 ,  G06F13/4282 ,  H04L12/10 ,  H04L12/40045

Abstract: A PoDL system includes a PSE supplying DC power and Ethernet data over a single twisted wire pair to a PD. Prior to coupling the DC voltage source to the wire pair, the PD needs to receive sufficient power to perform a detection and classification routine with the PSE to determine whether the PD is PoDL-compatible. The PSE has a low current, pull-up current source coupled to a first wire in the wire pair via a first inductor. This pull-up current charges a capacitor in the PD to a desired operating voltage, and the operating voltage is used to power a PD logic circuit. The PD logic circuit and a PSE logic circuit then control pull-down transistors to communicate detection and classification data via the first wire. After the handshaking phase, the PSE then applies the DC voltage source across the wire pair to power the PD for normal operation.

Abstract translation: PoDL系统包括通过单个双绞线对PD提供直流电源和以太网数据的PSE。 在将直流电压源耦合到线对之前，PD需要接收足够的电力以执行与PSE的检测和分类例程，以确定PD是否与PoDL兼容。 PSE具有通过第一电感器耦合到线对中的第一线的低电流，上拉电流源。 该上拉电流将PD中的电容器充电到期望的工作电压，并且使用工作电压为PD逻辑电路供电。 然后，PD逻辑电路和PSE逻辑电路控制下拉晶体管，以经由第一线路传送检测和分类数据。 在握手阶段之后，PSE将通过电线对施加直流电压源，为PD供电以进行正常工作。

公开(公告)号：US20150333935A1

公开(公告)日：2015-11-19

申请号：US14712855

申请日：2015-05-14

Applicant: Linear Technology Corporation

Inventor： Andrew J. Gardner ,  David Dwelley ,  Jeffrey L. Heath

IPC: H04L25/02 ,  H04L12/10 ,  H02M3/158

CPC classification number: H04L25/0266 ,  H02M3/156 ,  H02M3/158 ,  H02M2001/0029 ,  H04L12/10 ,  H04L25/0272

Abstract: A Power Over Data Lines (PoDL) system includes Power Sourcing Equipment (PSE) supplying DC power and differential Ethernet data over a single twisted wire pair to a Powered Device (PD). Due to start-up perturbations, PD load current variations, and other causes, dV/dt noise is introduced in the power signal. Such noise may be misinterpreted as data unless mitigated somehow. Rather than increasing the values of the passive filtering components conventionally used for decoupling/coupling the power and data from/to the wire pair, active circuitry is provided in the PSE, PD, or both to limit dV/dt in the power signal. Such circuitry may be implemented on the same chip as the PSE controller or PD controller. Therefore, the sizes of the passive components in the decoupling/coupling networks may be reduced.

Abstract translation: 数据线电源（PoDL）系统包括通过单个双绞线对有源设备（PD）提供直流电源和差分以太网数据的电源设备（PSE）。 由于启动扰动，PD负载电流变化和其他原因，dV / dt噪声被引入功率信号。 这种噪声可能被误解为数据，除非以某种方式得到缓解。 不是增加常规用于从/对线对去耦/耦合功率和数据的无源滤波组件的值，而是在PSE，PD或两者中提供有源电路以限制功率信号中的dV / dt。 这种电路可以在与PSE控制器或PD控制器相同的芯片上实现。 因此，可以减小去耦/耦合网络中的无源组件的尺寸。

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

IPC: H04L12/10 ,  G05B11/01 ,  H02J3/00

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.

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

IPC: H04B3/56 ,  H04L12/10 ,  H04L12/40 ,  H03J3/12 ,  H02J3/12

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.

公开(公告)号：US10090666B2

公开(公告)日：2018-10-02

申请号：US14956308

申请日：2015-12-01

Applicant: Linear Technology Corporation

Inventor： Andrew J. Gardner ,  Jeffrey L. Heath ,  David Dwelley

IPC: H02H3/20 ,  H02H3/087 ,  H02H3/06 ,  H02H11/00

Abstract: In one embodiment, a PoDL system includes a PSE that uses high side and low side circuit breakers that uncouple the PSE voltage source from the wire pair in the event that a fault is detected. Faults may include a temporary short to ground, or to a battery voltage, or between the wires. The breakers perform an automatic retry operation in the event the fault has been removed. The voltages on the wires in the wire pair may be monitored to determine whether the voltages are within a normal range or indicative of a fault condition. Other embodiments are disclosed.

公开(公告)号：US09377794B1

公开(公告)日：2016-06-28

申请号：US14054576

申请日：2013-10-15

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath

IPC: G05F1/46

CPC classification number: G05F1/10 ,  B60R16/03 ,  G05F1/462 ,  H04L12/10 ,  H04L41/0681 ,  Y02D30/30 ,  Y02D30/32

Abstract: A Power Over Ethernet (PoE) system includes Power Sourcing Equipment (PSE) providing data and voltage over Ethernet wires to a Powered Device (PD). Instead of the conventional detection and classification routine being performed every time the system is powered up, the pertinent data to determine whether to apply PoE to the PD is stored in a memory in the PSE. The memory is accessed by a controller in the PSE when the PSE is powered up. Therefore, a time-consuming detection and classification routine does not have to be performed each time the system is powered up. The system is particularly useful in automobiles where the particular PDs and PSEs are predetermined. The PoE data may be obtained the first time the system is powered up or may be stored in the memory when the PSE is designed or fabricated.

Abstract translation: 以太网供电（PoE）系统包括通过以太网线将数据和电压提供给有源设备（PD）的电源设备（PSE）。 代替在每次系统加电时执行传统的检测和分类程序，将用于确定是否将PoE应用于PD的相关数据存储在PSE中的存储器中。 当PSE上电时，存储器由PSE中的控制器访问。 因此，每当系统通电时，不必执行耗时的检测和分类程序。 该系统在特定PD和PSE预定的汽车中特别有用。 当PSE被设计或制造时，PoE数据可以在系统第一次上电时获得或者可以被存储在存储器中。

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。

公开(公告)号：US20150145324A1

公开(公告)日：2015-05-28

申请号：US14552164

申请日：2014-11-24

Applicant: Linear Technology Corporation

Inventor： Jeffrey Heath ,  David Dwelley

IPC: H04B3/56

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.

Abstract translation: PoDL系统包括通过线对连接到PD的PSE，其中差分数据和DC电力通过相同的线对传输。 通常，在系统每次上电时都需要低电压/电流检测和分类程序，以允许PD将其PoDL要求传达给PSE。 描述了各种技术，其简化或消除了这种启动例程，或者使PoDL系统具有更高的灵活性。 这样的技术包括：指定特定PD工作电压的方式; 在这种例程中禁用PD的UVLO电路的方法; 对于两个例程使用相反的极性电压; 使用电压限制器或浪涌保护器传送PoDL信息; 检测回路电阻; 使用PSE内存来存储以前的例程结果; 并且当PD负载由备用电源供电时，使用线对对PD通信电路供电。