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：US09026809B2

公开(公告)日：2015-05-05

申请号：US13668943

申请日：2012-11-05

Applicant: Linear Technology Corporation

Inventor： Michael Paul

IPC: G06F1/26 ,  H04L12/10 ,  H02H11/00

CPC classification number: G06F1/26 ,  H02H11/002 ,  H04L12/10

Abstract: A system for combining power to a load in a Powered Device (PD) using Power Over Ethernet (PoE) receives power from a first channel and power from a second channel, via four pairs of wires. A MOSFET bridge for each channel is initially disabled. A bridge controller IC simultaneously senses all the voltages and controls the bridge MOSFETs. The bridge controller IC also contains a first PoE handshaking circuit. A second PoE handshaking circuit is external to the bridge controller IC and operates independently. The body diodes in the MOSFET bridge initially couple the first channel to the second PoE handshaking circuit while isolating the second channel. The second handshaking circuit then couples the first channel to the load. The first handshaking circuit then carries out a PoE handshaking routine for the second channel. Ultimately, the bridge controller controls the bridge MOSFETs to couple both channels to the load.

Abstract translation: 使用以太网供电（PoE）的动力设备（PD）中的负载组合电力的系统通过四对电线从第一通道接收电力并从第二通道接收电力。 最初禁用每个通道的MOSFET桥。 桥式控制器IC同时感测所有电压并控制桥式MOSFET。 桥接控制器IC还包含第一个PoE握手电路。 第二个PoE握手电路在桥接控制器IC的外部，独立运行。 MOSFET桥接器中的体二极管首先将第一通道耦合到第二PoE握手电路，同时隔离第二通道。 然后，第二握手电路将第一通道耦合到负载。 然后，第一握手电路对第二通道执行PoE握手程序。 最终，桥式控制器控制桥式MOSFET将两个通道耦合到负载。

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：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：US10263794B2

公开(公告)日：2019-04-16

申请号：US15582445

申请日：2017-04-28

Applicant: Linear Technology Corporation

Inventor： Michael Paul ,  David M. Stover ,  Heath D. Stewart ,  Jeffrey L. Heath

IPC: H04L12/10 ,  G06F1/26 ,  H04L12/40

Abstract: The invention pertains to systems where DC power is supplied by a PSE to a PD, such as over differential data wire pairs. IEEE standards require a minimum current to be drawn from the PD in order for the PSE to continue supplying the DC voltage. If the PD is in a low power mode, the PSE will normally discontinue supplying the DC voltage, which then requires a new detection and classification routine for powering up again. To avoid this, a “maintain power signature” controller provides a periodic current pulse by a current source connected between the PD input and the PD's full bridge rectifier. Any droop in the DC voltage that reverse biases the full bridge rectifier while the PD is in its low power mode will not affect the current pulse, so the PSE continues to supply the DC voltage.

公开(公告)号：US20170338969A1

公开(公告)日：2017-11-23

申请号：US15582445

申请日：2017-04-28

Applicant: Linear Technology Corporation

Inventor： Michael Paul ,  David M. Stover ,  Heath D. Stewart ,  Jeffrey L. Heath

IPC: H04L12/10

CPC classification number: H04L12/10 ,  G06F1/26 ,  H04L12/40045

Abstract: The invention pertains to systems where DC power is supplied by a PSE to a PD, such as over differential data wire pairs. IEEE standards require a minimum current to be drawn from the PD in order for the PSE to continue supplying the DC voltage. If the PD is in a low power mode, the PSE will normally discontinue supplying the DC voltage, which then requires a new detection and classification routine for powering up again. To avoid this, a “maintain power signature” controller provides a periodic current pulse by a current source connected between the PD input and the PD's full bridge rectifier. Any droop in the DC voltage that reverse biases the full bridge rectifier while the PD is in its low power mode will not affect the current pulse, so the PSE continues to supply the DC voltage.

公开(公告)号：US20140129850A1

公开(公告)日：2014-05-08

申请号：US13668943

申请日：2012-11-05

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Michael Paul

IPC: G06F1/26

CPC classification number: G06F1/26 ,  H02H11/002 ,  H04L12/10

Abstract: A system for combining power to a load in a Powered Device (PD) using Power Over Ethernet (PoE) receives power from a first channel and power from a second channel, via four pairs of wires. A MOSFET bridge for each channel is initially disabled. A bridge controller IC simultaneously senses all the voltages and controls the bridge MOSFETs. The bridge controller IC also contains a first PoE handshaking circuit. A second PoE handshaking circuit is external to the bridge controller IC and operates independently. The body diodes in the MOSFET bridge initially couple the first channel to the second PoE handshaking circuit while isolating the second channel. The second handshaking circuit then couples the first channel to the load. The first handshaking circuit then carries out a PoE handshaking routine for the second channel. Ultimately, the bridge controller controls the bridge MOSFETs to couple both channels to the load.

Abstract translation: 使用以太网供电（PoE）的动力设备（PD）中的负载组合电力的系统通过四对电线从第一通道接收电力并从第二通道接收电力。 最初禁用每个通道的MOSFET桥。 桥式控制器IC同时感测所有电压并控制桥式MOSFET。 桥接控制器IC还包含第一个PoE握手电路。 第二个PoE握手电路在桥接控制器IC的外部，独立运行。 MOSFET桥接器中的体二极管首先将第一通道耦合到第二PoE握手电路，同时隔离第二通道。 然后，第二握手电路将第一通道耦合到负载。 然后，第一握手电路对第二通道执行PoE握手程序。 最终，桥式控制器控制桥式MOSFET将两个通道耦合到负载。