# US 5,706,157 A · Power distribution system with over-current protection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,157 A - Document ID: US5706157A - Status: Granted - Kind: A - Application number: 08/607,239 - Filed: 1996-02-26 - Granted: 1998-01-06 - Earliest claimed: 1996-02-26 - Assignees: Reltec Corporation - Inventors: Steven M. Galecki; Victor A. Falk - Web page: https://patentgrep.com/patent/US5706157A ## CPC - H04M 19/001: {Current supply source at the exchanger providing current to substations} - H04M 3/18: with means for reducing interference {or noise}; with means for reducing effects due to line faults {with means for protecting lines} - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract A communication power distribution system including a single power regulator which feeds a plurality of transmission lines current limited by corresponding active current limiters. ## Claims ### Claim 1 A communication power distribution system comprising: a single power regulator configured to supply a predetermined regulated power over a first set of a plurality of transmission lines; a plurality of active current limiters, at least one of the plurality in operative connection with one of the first set of plurality of transmission lines; a second set of a plurality of transmission lines, at least one of the plurality in operative connection with said at least one of the active current limiters; and, a plurality of optical network units, at least one of the plurality in operative connection with one of the second set of transmission lines. ### Claim 2 (depends on 1) The communication power distribution system according to claim 1 wherein an IGBT is used as a power switch of the active current limiters. ### Claim 3 (depends on 2) The power distribution system according to claim 2 wherein the power is distributed in a star configuration. ### Claim 4 (depends on 2) The power distribution system according to claim 2 wherein the active current limiters include thermal protection. ### Claim 5 (depends on 1) The communication power distribution system according to claim 1 further including a single housing holding the active current limiters and the single power regulator. ### Claim 6 (depends on 1) The communication power distribution system according to claim 1, wherein the first and second set of transmission lines are comprised of at least one of coaxial cable, and 2-wired twisted pairs. ### Claim 7 (depends on 1) The power distribution system according to claim 1 wherein the active current limiters include thermal protection. ### Claim 8 (depends on 1) The system according to claim 1 further including an over-voltage protector in operative connection with the active current limiter. ### Claim 9 (depends on 1) The system according to claim 1 wherein the active current limiter includes a power switch used to control current flow, and a current sensor in operative association with the power switch, which controls input to the power switch. ### Claim 10 (depends on 9) The system according to claim 9 wherein the active current limiter further includes a bias control section to assist in starting of the active current limiter. ### Claim 11 (depends on 10) The system according to claim 10 wherein the active current limiter further includes a gate alarm circuit, an alarm out circuit and reverse current protection circuit. ### Claim 12 (depends on 1) The system according to claim 1 wherein the active current limiter is configured to provide constant voltage up to a predetermined maximum current value, and to provide constant current at the predetermined maximum current value. ### Claim 13 A communication power distribution system comprising: a central office which generates system operating parameters; a host digital terminal in operative connection with the central office, configured to receive the system operating instructions from the central office; a plurality of optical network units, each arranged to receive control signals from the host digital terminal; and a local power hub in operative connection with the host digital terminal to receive control signals from the host digital terminal and in operative connection with each of the optical network units over individual transmission lines for carrying power to the optical network units, the local power hub including a single power regulator with a plurality of output lines, at least some of the output lines each having an associated active current limiter used to limit current in the associated output line, the output of the active current limiters connected to associated ones of the transmission lines. ### Claim 14 A star configured communication power distribution system comprising: a power regulator configured to supply predetermined regulated power in the star configured system over a first set of transmission lines; a plurality of active current limiters in operative connection with the first set of transmission lines; a second set of transmission lines in operative connection with the active current limiters; and, a plurality of optical network units in operative connection with the second set of transmission lines. ### Claim 15 (depends on 14) The system according to claim 14 further including an over-voltage protector in operative connection with the active current limiter. ### Claim 16 (depends on 14) The system according to claim 14 wherein the active current limiter includes a power switch used to control current flow, and a current sensor in operative association with the power switch, which controls input of the power switch. ### Claim 17 (depends on 16) The system according to claim 16 wherein the active current limiter further includes a bias control section to assist in starting of the active current limiter. ### Claim 18 (depends on 17) The system according to claim 17 wherein the active current limiter further includes a gate alarm circuit, an alarm out circuit and reverse current protection circuit. ### Claim 19 (depends on 14) The system according to claim 14 wherein the active current limiter is configured to provide constant voltage up to a predetermined maximum current value, and to provide constant current at the predetermined maximum current value. ### Claim 20 (depends on 14) The system according to claim 14 wherein the active current limiter further includes a heat limiting circuit.