Protection circuit for signal and power
View Patent ↗An electrical connection box for wall mounting provides a recessed external plug for receiving or transmitting power to electronic components. The connection box is configured to receive a variety of signal connection modules for interconnecting associated audio/visual electronics such as DVD players, displays and the like in adjacent apertures. The signal connection modules are inserted or extracted from the face of the connection box; replacing blanking plates, and is optionally recessed from the face of the box into the wall cut-out. The configuration and mating features of the box and modules also provides for a common and isolated ground reference for surge protection of the connected components. A signal connection module includes circuitry for surge protection of the connected A/V components receiving electrical power from an adjacent wall socket. The protection circuits in the signal connection module provides an isolated ground reference for the A/V components sharing a common ground connection at the wall socket, or a power conditioning module connected thereto.
1. A circuit for interconnecting low voltage signals and providing over voltage protection, the circuit comprising,
a) a plurality of input ports for receiving low voltage signals,
b) a plurality of output ports for transmitting the low voltage signals received at the input ports,
c) each of said input ports being connected to a corresponding output port by a separate parallel array of signal conductive paths, each parallel array of signal conductive paths comprising a signal ground path connected to a common ground
d) a common uni-direetional voltage limiting device,
e) a first ground rectifying diode having an anode connection to the cathode of said common uni-directional voltage limiting device, and a cathode connected to the common ground,
f) a second ground rectifying diode having a cathode connection to the anode of said common unidirectional voltage limiting device, and an anode connected to the common ground,
g) a plurality of first and second diode pairs, wherein each first and second diode pair is associated with one of the signal conductive paths between said input and output ports,
h) wherein each of the signal conductive paths between said input and output ports is coupled by a conductive path to a junction with the anode of said first diode of its associated diode pair and the cathode of said second diode of its associated diode pair,
i) wherein the cathodes of the first diodes are coupled to the anode of said common uni-directional voltage limiting device, and the anodes of the second diodes are coupled to the cathode of said common unidirectional voltage limiting device,
j) whereby the rectifying diodes direct current arising from an over voltage transient between a signal input and output port to flow through one of said first and second diodes connected to the signal conductive path between the signal input and output port before reaching the common unidirectional voltage limiting device, the current continuing to flow through one of the first and second ground rectifying diodes before reaching the common ground, thereby isolating other signal conductive paths from the over voltage condition.
2. A circuit for interconnecting low voltage signals and AC power, the circuit comprising:
a) a signal connection circuit comprising;
i) a plurality of input ports for receiving low voltage signals,
ii) a plurality of output ports for transmitting the low voltage signals received at the input ports,
iii) each of said input ports being connected to a corresponding output port by a separate parallel array of signal conductive paths, each path of the parallel array of signal conductive paths comprising a signal ground path
b) a power connection circuit comprising
i) a line input port,
ii) a neutral input port,
iii) a ground input port,
iv) a line output port connected to said line input port,
v) a neutral output port connected to said neutral input port,
vi) a ground output port connected to said ground input port,
c) a common ground connection between the ground connection of the power connection circuit and the signal ground paths of said signal connection circuit,
d) wherein each the signal ground path in the signal connection circuit are connected to said common ground connection by a voltage limiting device.
3. A circuit for interconnecting low voltage signals and AC power according to claim 2 wherein the signal conductive paths connecting input and output ports in the signal connection circuit are connected to said common ground connection by a second voltage limiting device in parallel connection thereto.
4. A circuit for interconnecting low voltage signals and AC power according to claim 2 wherein the signal connection circuit further comprises a uni-directional voltage limiting device disposed between said voltage limiting device and said common ground connection.
5. A circuit for interconnecting low voltage signals and AC power according to claim 3 further comprising a voltage limiting device in parallel connection between at Least one of the line and neutral ports and ground.
6. A circuit for interconnecting low voltage signals and AC power according to claim 3 wherein a voltage limiting device is disposed between each of the line, neutral and ground ports in a delta circuit.
7. A circuit for interconnecting low voltage signals and AC power according to claim 5 wherein the voltage limiting device in the power connection circuit is an MOV.
8. A circuit for interconnecting low voltage signals and AC power according to claim 6 wherein each voltage limiting device in the power connection circuit is an MOV.
9. A circuit for interconnecting low voltage signals and AC power according to claim 7 further comprising at least one fuse in thermal communication with one or more MOV's.
10. A circuit for interconnecting low voltage signals according to claim 1 wherein at least one of said input and output ports is selected from a group consisting of RCA, VGA, Co-axial cable, phone, data communications and Ethernet type connectors.
11. A circuit for interconnecting low voltage signals and AC power according to claim 2 wherein at least one of said signal input and output ports is selected from a group consisting of RCA, VGA, Co-axial cable, phone, data communications and Ethernet type connectors.
12. A circuit for interconnecting low voltage signals and AC power according to claim 2 further comprising a noise filtering circuit in serial connection between two or more of the power connection circuit input and output ports and operative to prevent AC lines noise from interfering with the quality of A/V equipment receiving AC power therefrom.
13. A circuit for interconnecting low voltage signals and AC power according to claim 12 wherein the noise filtering circuit comprises a first and second capacitors, each connecting the line ports to the neutral ports.
14. A circuit for interconnecting low voltage signals and AC power according to claim 12 wherein at least one of said signal input and output ports is selected from a group consisting of RCA, VGA, Co-axial cable, phone, data communications and Ethernet type connectors.