Systems and methods operable to allow loop powering of networked devices
View Patent ↗Embodiments of the present invention provide a network device operable to receive a network signal that may include both power and data from a coupled network. This network device includes a network connector and an integrated circuit. The network connector physically couples the network device to the network. An optional protection circuit may provide surge protection or incoming network signals received by the network device through the network connector. An optional switching/rectifying circuit sees the output of the protection circuit and is operable to rectify a power signal when contained within the network signal. The integrated circuit further includes a power feed circuit conductively coupled to the protection circuit and the rectifying circuit. This power feed circuit is operable to separate and pass the received data signal to a network physical layer and separate and pass the received power signal to a power management module. The power management module electrically couples to the integrated circuit but is not necessarily part of the integrated circuit. The power management module is operable to at least partially power the network device for specific circuits within the network device from the received power signal.
1. An Ethernet network device operable to receive both a power signal and a data signal through a coupled Ethernet network, comprising:
an Ethernet network connector operable to physically couple the Ethernet network device to the Ethernet network, wherein the Ethernet network connector receives a plurality of twisted pairs;
an integrated circuit (IC) coupled to the Ethernet network connector comprising a power feed circuit and a surge protection circuit, wherein the power feed circuit is operable to:
pass the received data signal to an Ethernet physical layer (PHY) module; and
pass the received power signal to a power management module, wherein the power management module is operable to at least partially power the Ethernet network device from the received power signal; and
the surge protection circuit interfaces to a diode bridge network and protects against surge voltage across a plurality of twisted pairs within the Ethernet network connector;
the IC comprising an IC ground that tracks an Ethernet line ground wherein potential at the IC varies up to approximately 1500 volts from chassis ground of the Ethernet network device.
2. The Ethernet network device of claim 1 wherein:
the power feed circuit in the integrated circuit (IC) comprises a solid-state nonmagnetic transformer that replaces functionality of a magnetic transformer whereby electromagnetic interference is reduced; and
the IC comprises a high differential impedance and a low common mode impedance wherein the differential impedance is sufficiently high to enable separation of the data signal from the power signal and the common mode impedance is sufficiently low to block alternating current (AC) while passing direct current (DC) without using a choke.
3. The Ethernet network device of claim 1 , wherein the IC further comprises at least one circuit selected from the group consisting of:
a switching/rectifying circuit;
the power management module;
the Ethernet physical layer (PHY); and
an Ethernet media access controller (MAC), wherein the Ethernet PHY module and Ethernet MAC, when coupled, are operable to implement hardware layers of an Ethernet protocol stack.
4. The Ethernet network device of claim 1 , wherein the received power signal does not exceed 57 volts.
5. The Ethernet network device of claim 1 , wherein the Ethernet PHY module is operable to implement physical layer functions associated with data rates selected from the group of data rates consisting of: 10 Mbps, 100 Mbps, 1 Gbps, and 10 Gbps.
6. The Ethernet network device of claim 1 , wherein the Ethernet network device is configured to receive the data signal whether the power signal from the Ethernet network is present or absent.
7. The Ethernet network device of claim 1 , wherein the Ethernet network device comprises at least one device selected from the group consisting of:
a voice over internet protocol (VoIP) telephone;
an Ethernet router;
an Ethernet switch;
a printer;
a data server;
an Ethernet enabled camera;
a wireless access point;
a base station;
a playback device;
a portable computing device;
a personal data assistant;
a wireless terminal;
a graphics display; and
an audio interface.
8. The Ethernet network device of claim 1 , wherein the received power signals are IEEE 802.3af compliant.
9. The Ethernet network device of claim 8 further comprising:
the Ethernet network connectors comprising an RJ45 connector that physically couples the Ethernet network device to the Ethernet network, and wherein the RJ45 connector couples twisted pairs that further comprise conductors 1 and 2 ; 3 and 6 ; 4 and 5 ; and 7 and 8 ; and
a diode bridge network receives the Ethernet power signal utilizing conductors 1 , 2 , 3 , and 6 or conductors 4 , 5 , 7 , and 8 .
10. The Ethernet network device of claim 1 , wherein the power signal is provided to the Ethernet network from a power sourcing equipment (PSE), and wherein the PSE is operable to determine if the Ethernet network device is IEEE 802.3af power device compliant.
11. The Ethernet network device of claim 1 , further comprising:
direct current (DC) blocking capacitors coupling the Ethernet PHY module to the received signal.
12. The Ethernet network device of claim 1 further comprising:
a switching/rectifying circuit operable to:
accept a power signal from the plurality of twisted pairs; and
route the power signal to an appropriate node of the power feed circuit based on a polarity of the power signal.
13. A method to at least partially power an Ethernet network powered device (PD), from an Ethernet power signal fed through an Ethernet network connection, comprising:
physically coupling the Ethernet network PD to the network;
receiving an Ethernet signal from the Ethernet network, wherein the Ethernet signal comprises the plurality of power signals and/or a data signal(s);
passing the Ethernet signal to an integrated circuit (IC) within the Ethernet network PD, the IC comprising an IC ground that tracks an Ethernet line ground wherein potential at the IC varies up to approximately 1500 volts from chassis ground of the Ethernet network PD;
separating with the IC, the data signal from the Ethernet signal, wherein the data signal is passed to an Ethernet physical layer (PHY) module;
separating with the IC, the Ethernet power signal from the Ethernet signal, wherein the power signal is passed to the power management module;
at least partially powering the Ethernet network PD from the power signal;
passing the network signal through a protective circuit operable to:
provide surge protection; and
rectify the power signal in order to apply the rectified power signal to the IC.
14. The method of claim 13 , further comprising interfacing a switching/rectifying circuit with a plurality of twisted pairs, wherein the plurality of twisted pairs pass the Ethernet signal.
15. The method of claim 13 , wherein:
an RJ45 connector physically couples the Ethernet network PD to the Ethernet network, and wherein the RJ45 connector couples twisted pairs that further comprise conductors 1 and 2 ; 3 and 6 ; 4 and 5 ; and 7 and 8 ; and
the diode bridge network receives the Ethernet power signal utilizing conductors 1 , 2 , 3 , and 6 or conductors 4 , 5 , 7 , and 8 .
16. The method of claim 13 , wherein the Ethernet PHY module is operable to implement physical layer functions associated with data rates selected from the group of data rates consisting of: 10 Mbps, 100 Mbps, 1 Gbps, and 10 Gbps.
17. The method of claim 13 , wherein the IC further comprises at least one circuit selected from the group consisting of:
the surge protection circuit;
the diode bridge network;
the power management circuit;
the Ethernet physical layer (PHY); and
an Ethernet media access controller (MAC), wherein the Ethernet PHY module and Ethernet MAC, when coupled, are operable to implement hardware layers of an Ethernet protocol stack.
18. The method of claim 13 , wherein the Ethernet network PD is configured to receive the data signal whether the power signal from the network is present or absent.
19. The method of claim 13 , wherein the Ethernet network PD comprises at least one device selected from the group consisting of:
a voice over internet protocol (VoIP) telephone;
an Ethernet router;
an Ethernet switch;
a printer;
a data server;
an Ethernet enabled camera;
a wireless access point;
a playback device;
a portable computing device;
a personal data assistant;
a wireless terminal;
a graphics display; and
an audio interface.
20. The method of claim 13 , wherein the power signal is IEEE 802.3af compliant.
21. The method of claim 13 , further comprising:
supplying the power signal to the Ethernet network from a power sourcing equipment (PSE), and
operating the PSE to determine whether the Ethernet network device is IEEE 802.3af compliant.
22. The method of claim 13 , further comprising:
using the integrated circuit (IC) to separate the data signal from the network signal using direct current (DC) blocking capacitors that couple the network PHY module to the Ethernet signal; wherein:
the IC comprises a high differential impedance and a low common mode impedance wherein the differential impedance is sufficiently high to enable separation of the data signal from the power signal and the common mode impedance is sufficiently low to block alternating current (AC) while passing direct current (DC) without using a choke.
23. The method of claim 13 , wherein the Ethernet network comprises at least one network selected from the group consisting of:
a vehicle based network;
a high speed data network;
a low speed data network;
a local-interconnect network (LIN);
a controller area network (CAN);
a FlexRay network;
a TTCAN network;
a J1939 compliant network;
a ISO 11898 compliant network; and
an ISO 11519-2 compliant network.
24. An Ethernet network device operable to receive both a power signal and a data signal through a coupled Ethernet network, comprising:
an Ethernet network connector operable to physically couple the Ethernet network device to the Ethernet network, wherein the Ethernet network connector receives a plurality of twisted pairs;
a circuit coupled to the Ethernet network connector that further comprises a power feed circuit, wherein the power feed circuit is operable to:
pass the received data signal to an Ethernet PHY module; and
pass the received power signal to a power management module, wherein the power management module is operable to at least partially power the Ethernet network device from the received power signal,
the circuit comprising a circuit ground that tracks an Ethernet line around wherein potential at the circuit varies up to approximately 1500 volts from chassis ground of the Ethernet network device; and
a protection circuit coupled to the plurality of twisted pairs that protects against surge across the plurality of twisted pairs.
25. A network device operable to receive both a power signal and a data signal through a coupled network, comprising:
a network connector operable to physically couple the network device to the network, wherein the network connector receives a plurality of twisted pairs;
a protection circuit, wherein the protection circuit is operable to:
couple to the plurality of twisted pairs; and
provide surge protection across the plurality of twisted pairs;
a diode bridge, wherein the diode bridge is operable to rectify a power signal received from the plurality of twisted pairs;
an integrated circuit (IC) that further comprises a power feed circuit conductively coupled to the surge protection circuit and diode bridge network, and wherein the power feed circuit is operable to:
pass the received data signal to a network physical layer (PHY) module; and
pass the received power signal to a power management module, wherein the power management module is operable to at least partially power the network device from the received power signal,
the IC comprising an IC ground that tracks an Ethernet line ground wherein potential at the IC varies up to approximately 1500 volts from chassis ground of the network device.