Power delivery over digital interaction interface for video and audio (DiiVA)
View Patent ↗A system for delivering power over a network of devices connected through a serial link includes a first and second differential pairs of wires. Each differential pair of wires is double AC coupled by a HPF on one side and by another HPF on an opposite side. An LPF connects a portion of each differential pair of wires between the HPFs to a voltage source, and another LPF connects that portion of each differential pair to a load. The system further includes a third and fourth differential pairs of wires. All four differential pairs of wires are located within a single cable, such as a CAT6 cable. The first, second and third differential pair of wires are used for video links, and the fourth differential pair of wires are used for the bi-directional hybrid link. A power delivery circuit in each device includes a voltage source, a power relay switch, a signature resistor for detection, and a load detector.
1. A power delivery circuit configured to deliver power to one or more of a plurality of devices connected in a network, the power delivery circuit comprising:
a voltage source configured to generate a voltage;
a power relay switch configured to relay, when closed, the voltage generated by the voltage source to one or more of the connected devices;
a signature resistor connected to the switch and configured to detect a power source from one or more of the connected devices; and
a load detector connected to the switch and configured to read a load current flowing therethrough so as to detect a load in one of the connected devices, and to extract information about the connected device based on the load current;
wherein the information extracted by the load detector comprises information regarding whether the connected device is powered on or powered off, and whether or not the connected device needs a supply of power.
2. The power delivery circuit of claim 1 , further comprising a controller that controls opening and closing of the power relay switch.
3. The power delivery circuit of claim 1 , wherein the plurality of devices are connected to each other through a daisy chain, and wherein the power delivery circuit is included within each one of the devices in the daisy chain.
4. The power delivery circuit of claim 1 , wherein the information extracted by the load detector further comprises information regarding the identity of the connected device.
5. The power delivery circuit of claim 1 , wherein the load detector is further configured to detect removal of one of the plurality of devices from the network.
6. The power delivery circuit of claim 1 , wherein the load detector is further configured to detect connection of a new device to the network.
7. A method of delivering power to one of a plurality of devices connected in a daisy chain, the method comprising:
detecting a load in a first device of the plurality of devices including detecting a load current flowing through the load;
extracting information from the first device based on the detected load current; and
relaying power to the first device based on the extracted information;
wherein the information extracted comprises information regarding whether the first device is powered on or powered off, and whether or not the first device needs a supply of power.
8. The method of claim 7 , wherein the information extracted from the device further comprises information regarding the identity of the first device.
9. The method of claim 7 , further comprising:
detecting removal of a device of the plurality of devices.
10. The method of claim 7 , further comprising:
detecting connection of a new device to the plurality of devices.