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

IPC: H04L12/10 ,  G06F1/26

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.

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。

公开(公告)号：US20180115191A1

公开(公告)日：2018-04-26

申请号：US15723631

申请日：2017-10-03

Applicant: Linear Technology Corporation

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

IPC: H02J13/00 ,  G05B15/02

Abstract: One or more Power Sourcing Equipment (PSE) are coupled to points in a network of interconnected nodes. Each node has a first port and a second port. Assume the first port of a first node is receiving DC power from the PSE. The first node, at its second port, then detects an electrical signature from a first port of an adjacent second node. If the proper electrical signature is presented by the adjacent second node, the powered first node closes a switch to pass power between its first port and second port to power the second node via the first port of the second node. All nodes in the network are then sequentially powered up in this manner. If there is a fault between the first node and the second node, the second node will be powered by another node connected to the second port of the second node.

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：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。

公开(公告)号：US10547206B2

公开(公告)日：2020-01-28

申请号：US15723631

申请日：2017-10-03

Applicant: Linear Technology Corporation

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

IPC: H02J13/00 ,  H04L12/10 ,  H04L12/24 ,  H04L12/26 ,  H04L12/437 ,  G05B15/02 ,  G01R27/16

Abstract: One or more Power Sourcing Equipment (PSE) are coupled to points in a network of interconnected nodes. Each node has a first port and a second port. Assume the first port of a first node is receiving DC power from the PSE. The first node, at its second port, then detects an electrical signature from a first port of an adjacent second node. If the proper electrical signature is presented by the adjacent second node, the powered first node closes a switch to pass power between its first port and second port to power the second node via the first port of the second node. All nodes in the network are then sequentially powered up in this manner. If there is a fault between the first node and the second node, the second node will be powered by another node connected to the second port of the second node.

公开(公告)号：US09860072B2

公开(公告)日：2018-01-02

申请号：US15134117

申请日：2016-04-20

Applicant: Linear Technology Corporation

Inventor： Andrew J. Gardner ,  David M. Dwelley ,  Heath Stewart

IPC: H02J1/00 ,  H02J3/00 ,  H04B3/54 ,  H04L12/10 ,  H04L12/12 ,  H04L12/403

CPC classification number: H04L12/10 ,  H04L12/12 ,  H04L12/403 ,  Y02D50/40

Abstract: A system includes a master and a slave coupled via a wire pair for transmitting differential data. The master and slave are each powered by a local DC power supply. In a normal mode, a DC voltage and differential data are supplied over the same wire pair. The differential data is processed by a PHY AC-coupled to the wire pair. To enter a low power sleep mode, such as due to a temporary non-use of the system, the master interrupts the DC voltage on the wire pair, which signals to the slave to enter the sleep mode. The system is woken up by reapplying the DC voltage to the wire pair to signal to the slave to wake up. Only the DC path, and not the data path, is used for signaling the sleep mode and awake mode, so the data path can be disabled to conserve power.

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：US20160337138A1

公开(公告)日：2016-11-17

申请号：US15134117

申请日：2016-04-20

Applicant: Linear Technology Corporation

Inventor： Andrew J. Gardner ,  David M. Dwelley ,  Heath Stewart

IPC: H04L12/10

CPC classification number: H04L12/10 ,  H04L12/12 ,  H04L12/403 ,  Y02D50/40

Abstract: A system includes a master and a slave coupled via a wire pair for transmitting differential data. The master and slave are each powered by a local DC power supply. In a normal mode, a DC voltage and differential data are supplied over the same wire pair. The differential data is processed by a PHY AC-coupled to the wire pair. To enter a low power sleep mode, such as due to a temporary non-use of the system, the master interrupts the DC voltage on the wire pair, which signals to the slave to enter the sleep mode. The system is woken up by reapplying the DC voltage to the wire pair to signal to the slave to wake up. Only the DC path, and not the data path, is used for signaling the sleep mode and awake mode, so the data path can be disabled to conserve power.

Abstract translation: 系统包括通过线对耦合的主机和从机，用于发送差分数据。 主机和从机都由本地直流电源供电。 在正常模式下，通过相同的线对提供直流电压和差分数据。 差分数据由耦合到线对的PHY处理。 要进入低功耗睡眠模式，例如由于暂时不使用系统，主机会中断线对上的直流电压，从而将信号通知从机进入睡眠模式。 通过将直流电压重新应用到线对来唤醒系统，以向从机发信号进行唤醒。 只有DC路径，而不是数据路径用于信令睡眠模式和唤醒模式，因此可以禁用数据路径以节省功耗。