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：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。

公开(公告)号：US20180129171A1

公开(公告)日：2018-05-10

申请号：US15863571

申请日：2018-01-05

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath ,  Kirk Su ,  Ryan Huff

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

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.

公开(公告)号：US09897981B2

公开(公告)日：2018-02-20

申请号：US14501517

申请日：2014-09-30

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath ,  Kirk Su ,  Ryan Huff

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

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.

公开(公告)号：US20170237574A1

公开(公告)日：2017-08-17

申请号：US15587315

申请日：2017-05-04

Applicant: Linear Technology Corporation

Inventor： Jeffrey Heath ,  David Dwelley

IPC: H04L12/10

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.

公开(公告)号：US09667429B2

公开(公告)日：2017-05-30

申请号：US14705849

申请日：2015-05-06

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath ,  Heath Stewart ,  Michael Paul

IPC: H04L12/931 ,  H04L12/10 ,  G01R31/04 ,  G06F1/26

CPC classification number: H04L12/10 ,  G01R31/041 ,  G06F1/26 ,  G06F1/266 ,  H04L49/351

Abstract: A PSE includes a PSE controller that performs a handshaking routine with any PDs connected to the data wire pairs and spare wire pairs and applies power to the data wire pairs and spare wire pairs, via a switch, if certain conditions are met. Two different levels of currents are supplied to different terminals of the PSE controller that are connected to the data wire pairs and the spare wire pairs, and the resulting voltages are measured. The voltages are used to determine the PD impedances at the ends of the data wire pairs and spare wire pairs to determine whether a PD is connected to the data wire pair, whether another PD is connected to the spare wire pair, or whether a single PD is connected to both the data wire pairs and the spare wire pairs.

公开(公告)号：US09547318B1

公开(公告)日：2017-01-17

申请号：US14054488

申请日：2013-10-15

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath ,  Kirk Su

IPC: G05F1/46 ,  G05F1/10

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

Abstract: In a method performed by a Power Over Ethernet (PoE) system, Power Sourcing Equipment (PSE) provides data and voltage over Ethernet wires to a Powered Device (PD). The PD converts the PSE voltage to a regulated voltage by at least one DC-DC converter in the PD. A first load in the PD, such as a processor, operates in a standby mode during a standby period and draws a low current from the converter via a low current path. During this standby period, a high current load in the PD is disconnected and does not draw current. When the first load comes out of the standby mode and into an active mode, the converter supplies a relatively high current to the second load and the first load. In this way, the first load, if a processor, can be already booted up at the time the second load becomes active.

Abstract translation: 在通过以太网供电（PoE）系统执行的方法中，电源设备（PSE）通过以太网电缆将数据和电压提供给有源设备（PD）。 PD通过PD中的至少一个DC-DC转换器将PSE电压转换成调节电压。 PD中的第一负载（例如处理器）在待机期间在待机模式下工作，并且通过低电流路径从转换器抽取低电流。 在该待机期间，PD中的高电流负载断开，并且不抽出电流。 当第一个负载从待机模式进入活动模式时，转换器向第二个负载和第一个负载提供相对较高的电流。 以这种方式，如果处理器的第一个负载在第二个负载激活时可以被启动。

公开(公告)号：US20150326403A1

公开(公告)日：2015-11-12

申请号：US14705849

申请日：2015-05-06

Applicant: Linear Technology Corporation

Inventor： David Dwelley ,  Jeffrey Heath ,  Heath Stewart ,  Michael Paul

IPC: H04L12/10

CPC classification number: H04L12/10 ,  G01R31/041 ,  G06F1/26 ,  G06F1/266 ,  H04L49/351

Abstract: A PSE includes a PSE controller that performs a handshaking routine with any PDs connected to the data wire pairs and spare wire pairs and applies power to the data wire pairs and spare wire pairs, via a switch, if certain conditions are met. Two different levels of currents are supplied to different terminals of the PSE controller that are connected to the data wire pairs and the spare wire pairs, and the resulting voltages are measured. The voltages are used to determine the PD impedances at the ends of the data wire pairs and spare wire pairs to determine whether a PD is connected to the data wire pair, whether another PD is connected to the spare wire pair, or whether a single PD is connected to both the data wire pairs and the spare wire pairs.

Abstract translation: PSE包括一个PSE控制器，它与连接到数据线对和备用线对的任何PD执行握手程序，并且在满足某些条件的情况下通过开关对数据线对和备用线对施加电力。 向连接到数据线对和备用线对的PSE控制器的不同端子提供两个不同电平的电流，并且测量所得到的电压。 电压用于确定数据线对和备用线对端的PD阻抗，以确定PD是否连接到数据线对，无论另一个PD是否连接到备用线对，还是单个PD 连接到数据线对和备用线对。