Redundant and fault-tolerant power distribution system having an integrated communication network
A power distribution and communication system includes nodes connected by power lines and communication links. The system receives power from one or more power sources. Each node contains at least one power port, data port and load port. Associated with each power port and load port is a port monitor for measuring current flowing into or out of the port and the voltage difference between the port outlet and ground, which measurements are passed to a processing element. The processing element and monitor analyze measured values to detect fault conditions. Upon fault condition detection, the port is disabled by opening a switch, disconnecting the port from the system voltage. The processing element receives power directly from the power line, thus receiving power from a live power line even if the associated power port is disabled allowing the processing element to enable a disabled node following a failure.
1. A power distribution system having an integrated communication network, comprising:
a plurality of nodes, wherein each of the nodes includes:
a power port and an associated port monitor;
a load port and an associated port monitor; and
a processing element;
wherein the port monitors associated with the power port and the load port are connected to the processing element, and include a current monitor for measuring current flowing into or out of the corresponding port;
a topology that enables current to flow bi-directionally between the nodes; and
a communication link for conducting data bi-directionally between the nodes;
wherein data passed on the communication link is used for any of:
enabling or disabling any of:
a power source connected to a particular power port at a corresponding node, or
a device connected to a particular load port at a corresponding node.
2. The system of claim 1 , wherein the processing element corresponding to each of the nodes is configured to:
send and receive current measurements between the corresponding node and a neighboring node; and
compare the sent and received current measurements.
3. The system of claim 2 , wherein when the sent and received current measurements are equal under normal operating conditions.
4. The system of claim 2 , wherein the processing element is configured to detect a partial short condition based on the comparison between the sent and received current measurements.
5. The system of claim 4 , wherein the processing element is configured to disable the power port of the corresponding node based on the detected partial short condition.
6. The system of claim 1 , wherein each of the port monitors includes:
a switch for enabling and disabling the corresponding port; and
a comparator for comparing the current measured by the current monitor with a threshold value to produce a comparison result.
7. The system of claim 6 , wherein the switch is closed only upon approval from both the processing element and the comparator.
8. The system of claim 7 , wherein each of the port monitors includes an AND gate, such that the switch is closed only when the approval is input to the AND gate from both the processing element and the comparator.
9. The system of claim 8 , wherein the processing element is configured to send a zero value to the AND gate to disable the corresponding port.
10. The system of claim 1 , wherein each of the nodes includes a data port, and wherein the communication link is connected between the data ports corresponding to different nodes.
11. A method, comprising:
establishing a power distribution system having an integrated communication network, comprising:
a plurality of nodes, wherein each of the nodes includes:
a power port and an associated port monitor;
a load port and an associated port monitor; and
a processing element;
wherein the port monitors associated with the power port and the load port are connected to the processing element, and include a current monitor for measuring current flowing into or out of the corresponding port;
interconnecting the power ports between the nodes with a topology that enables current to flow bi-directionally between the nodes;
establishing a communication link for conducting data bi-directionally between the nodes; and
passing data on the communication link for any of:
enabling or disabling any of:
a power source connected to a particular power port at a corresponding node, or
a device connected to a particular load port at a corresponding node.
12. The method of claim 11 , further comprising:
with the processing element corresponding to each of the nodes:
sending and receiving current measurements between the corresponding node and a neighboring node; and
comparing the sent and received current measurements.
13. The method of claim 12 , wherein when the sent and received current measurements are equal under normal operating conditions.
14. The method of claim 12 , further comprising:
with the processing element corresponding to each of the nodes:
detecting a partial short condition based on the comparison between the sent and received current measurements.
15. The method of claim 14 , further comprising:
with the corresponding processing element, disabling the power port of the corresponding node based on the detected partial short condition.
16. The method of claim 11 , wherein each of the port monitors includes:
a switch for enabling and disabling the corresponding port; and
a comparator for comparing the current measured by the current monitor with a threshold value to produce a comparison result.
17. The method of claim 16 , wherein the switch is closed only upon approval from both the processing element and the comparator.
18. The method of claim 17 , wherein each of the port monitors includes an AND gate, wherein the switch is closed only when the approval is input to the AND gate from both the processing element and the comparator.
19. The method of claim 18 , wherein the processing element sends a zero value to the AND gate to disable the corresponding port.
20. The method of claim 11 , wherein each of the nodes includes a data port, and wherein the communication link is connected between the data ports corresponding to different nodes.
21. A node for connection to an integrated communication network, the node comprising:
a power port and an associated port monitor;
a load port and an associated port monitor; and
a processing element;
wherein the port monitors associated with the power port and the load port are connected to the processing element, and include a current monitor for measuring current flowing into or out of the corresponding power port or load port;
wherein the node is configured to be interconnected with one or more other nodes within the integrated communication network, including:
a topology that enables current to flow bi-directionally between the node and the other nodes; and
a communication link for conducting data bi-directionally between the node and the other nodes;
wherein data passed on the communication link is used for any of:
enabling or disabling any of:
a power source connected to a particular power port at a corresponding node, or
a device connected to a particular load port at a corresponding node.
22. The node of claim 21 , wherein the processing element is configured to:
send and receive current measurements between the node and a neighboring one of the other nodes; and
compare the sent and received current measurements.
23. The node of claim 22 , wherein when the sent and received current measurements are equal under normal operating conditions.
24. The node of claim 22 , wherein the processing element is configured to detect a partial short condition based on the comparison between the sent and received current measurements.
25. The node of claim 24 , wherein the processing element is configured to disable the power port based on the detected partial short condition.
26. The node of claim 21 , wherein each of the port monitors includes:
a switch for enabling and disabling its corresponding port; and
a comparator for comparing the measured current measured by the current monitor with a threshold value to produce a comparison result.
27. The node of claim 26 , wherein the switch is closed only upon approval from both the processing element and the comparator.
28. The node of claim 27 , wherein each of the port monitors includes an AND gate, wherein the switch is closed only when the approval is input to the AND gate from both the processing element and the comparator.
29. The node of claim 28 , wherein the processing element is configured to send a zero value to the AND gate to disable the corresponding port.
30. The node of claim 21 , further comprising:
a data port, and wherein the communication link is connected between the data port and a corresponding data port at one of the other nodes.