# US 2014/0191660 A1 · Lighting fixture with integral circuit protection field > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191660 A1 - Document ID: US20140191660A1 - Status: Published application - Kind: A1 - Application number: 13/734,597 - Filed: 2013-01-04 - Published: 2014-07-10 - Earliest claimed: 2013-01-04 - Assignees: Cree, Inc. - Applicants: Cree, Inc. - Inventors: Joshua J. Markle; Dao Dinh; Edward Steinke; Charles W. Richards - Web page: https://patentgrep.com/patent/US20140191660A1 ## CPC - H05B 45/50: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits - H05B 47/24: Circuit arrangements for protecting against overvoltage - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A lighting fixture includes a power input configured to be coupled to a power source, a power output configured to be coupled to an external load and a lighting device, such as a light emitting diode (LED) device, coupled to the power input and configured to provide illumination. The lighting fixture further includes a protection circuit coupled between the power input and the power output and configured to detect a condition of a power source coupled to the power input and to control power transmission between the power input and the power output responsive to the detected condition. The power output may be configured to support daisy-chain connection of the lighting fixture to at least one other lighting fixture, and the protection circuit may be configured to control power transmission to the at least one other lighting fixture responsive to the detected condition. ## Claims ### Claim 1 A lighting fixture comprising: a power input configured to be coupled to a power source; a power output configured to be coupled to an external load; a lighting device coupled to the power input; and a protection circuit coupled between the power input and the power output and configured to detect a condition of a power source coupled to the power input and to control power transmission between the power input and the power output responsive to the detected condition. ### Claim 2 (depends on 1) The lighting fixture of claim 1, wherein the lighting device is coupled to the power input by the protection circuit and wherein the protection circuit is configured to control power transmission to the lighting device. ### Claim 3 (depends on 1) The lighting fixture of claim 1, wherein the power output is configured to support daisy-chain connection of the lighting fixture to at least one other lighting fixture, and wherein the protection circuit is configured to control power transmission to the at least one other lighting fixture responsive to the detected condition. ### Claim 4 (depends on 1) The lighting fixture of claim 1, wherein the lighting device comprises a light source and a driver electronics unit configured to drive the light source, and wherein the circuit protection device is configured to control power transmission to the driver electronics unit responsive to the detected condition. ### Claim 5 (depends on 4) The lighting fixture of claim 4, wherein the protection circuit comprises a switch coupled to the power input and the power output and a control circuit configured to detect the condition of the power source and to control the switch responsive to the detected condition. ### Claim 6 (depends on 1) The lighting fixture of claim 1, wherein the protection circuit comprises a switch coupled to the power input and the power output and a control circuit configured to detect the condition of the power source and to control the switch responsive to the detected condition. ### Claim 7 (depends on 6) The lighting fixture of claim 6, wherein the condition of the power source comprises a voltage condition and/or a current condition. ### Claim 8 (depends on 6) The lighting fixture of claim 6, wherein the control circuit is configured to control the switch responsive to an external control input. ### Claim 9 (depends on 8) The lighting fixture of claim 8, wherein the control circuit is configured to support communications with an external electronic device that provides the external control input. ### Claim 10 (depends on 1) The lighting fixture of claim 1, wherein the lighting device comprises an LED lighting device. ### Claim 11 (depends on 1) The lighting fixture of claim 1, further comprising a troffer housing configured to provide ingress for power input wiring and egress for power output wiring, wherein the lighting device is supported by the housing and wherein the protection circuit comprises a module configured to be installed in and/or on the housing. ### Claim 12 A lighting fixture comprising: a housing configured to provide ingress for power input wiring and egress for power output wiring; and a lighting device supported by the housing, wherein the housing and the lighting device are configured to support connection of the power output wiring and the lighting device to the power input wiring via a protection circuit in and/or on the housing, the protection circuit configured to detect a condition of a power source coupled to the power input wiring and to control power transmission between the power input wiring and the power output wiring responsive to the detected condition. ### Claim 13 (depends on 12) The lighting fixture of claim 12, wherein the lighting device comprises a driver electronics unit and a light source configured to be driven by the driver electronics unit, and wherein the driver electronics unit is configured to be coupled to the power input wiring and the power output wiring by the protection circuit. ### Claim 14 (depends on 13) The lighting fixture of claim 13, wherein the protection circuit is configured as a module, and wherein the driver electronics unit is selectively configurable to be directly connected to the power input wiring and the power output wiring in a first configuration and to be connected to the power input wiring and the power output wiring via the protection module in a second configuration. ### Claim 15 (depends on 12) The lighting fixture of claim 12, wherein the protection circuit is configured as a module and wherein the housing and the lighting device are selectively configurable to support direct connection of the lighting device to the power input wiring and the power output wiring in a first configuration and to support connection of the lighting device to the power input wiring and the power output wiring via the protection module in a second configuration. ### Claim 16 (depends on 15) The lighting fixture of claim 15, wherein the protection circuit comprises a switch coupled to the power input and the power output and a control circuit configured to detect the condition of the power source and to control the switch responsive to the detected condition. ### Claim 17 (depends on 16) The lighting fixture of claim 16, wherein the condition of the power source comprises a voltage condition and/or a current condition. ### Claim 18 (depends on 12) The lighting fixture of claim 12, wherein the lighting device comprises an LED lighting device. ### Claim 19 An apparatus comprising: a protection circuit configured to be connected to a power input, a power output and a lighting device of a lighting fixture and operative to protect the lighting device and at least one device coupled to the power output of the lighting fixture. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the protection circuit comprises: a switch; and a control circuit configured to detect a condition on a power conductor and to operate the switch responsive to the detected condition. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the switch and the control circuit are arranged as a module configured to be mounted in and/or on a housing of the lighting fixture such that the control circuit is coupled to the power input of the lighting fixture and the switch is operable to couple and decouple the power input and the power output of the lighting fixture. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the control circuit is configured to control the switch responsive to an external control input. ### Claim 23 (depends on 22) The lighting fixture of claim 22, wherein the control circuit is configured to support communications with an external electronic device that provides the external control input. ### Claim 24 (depends on 19) The apparatus of claim 19, wherein the protection circuit is configured to be coupled to a driver circuit of an LED lighting device. ### Claim 25 A lighting fixture comprising: a power input configured to be coupled to a power source; a lighting device coupled to the power input; and a resettable protection circuit coupled between the power input and the lighting device and configured to control power transmission between the power input and the lighting device. ### Claim 26 (depends on 25) The lighting fixture of claim 25, further comprising a power output configured to be coupled to an external load and wherein the resettable protection circuit is configured to control power transmission between the power input and the power output. ### Claim 27 (depends on 25) The lighting fixture of claim 25, wherein the resettable protection circuit is configured to detect a voltage condition and/or a current condition and to control power transmission between the power input and the lighting device responsive to the detected voltage condition and/or current condition. ### Claim 28 (depends on 27) The lighting fixture of claim 27, wherein the resettable protection circuit is configured to be reset responsive to a remote input.