# US 2014/0152184 A1 · Lighting control circuit, illuminating lamp using the lighting control circuit, and lighting device using the illuminating lamp > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152184 A1 - Document ID: US20140152184A1 - Status: Published application - Kind: A1 - Application number: 14/131,037 - Filed: 2012-06-27 - Published: 2014-06-05 - Earliest claimed: 2011-07-06 - Assignees: Ricoh Company, Ltd. - Inventors: Hisashi Tomiyama; Masaharu Urano; Kazuaki Iseda; Shigemi Hagiwara - Web page: https://patentgrep.com/patent/US20140152184A1 ## CPC - H05B 47/10: Controlling the light source - F21K 9/27: Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes - F21Y 2115/10: Light-emitting diodes [LED] - 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 - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A lighting control circuit for an illuminating lamp includes: a rectifier part that is connected to a ballast to which commercial alternating-current electric power is supplied, and converts the alternating current to direct current; a smoothing capacitor that is provided on an output side of the rectifier part, and removes an alternating-current component included in direct current outputted from the output side; a drive circuit that has a switching element, and performs on-off control on electric current flowing to a plurality of solid-state light-emitting elements connected in series to both ends of the smoothing capacitor; and an inductor that is provided in an electric power supply system between the ballast and the smoothing capacitor. ## Claims ### Claim 1 A lighting control circuit for an illuminating lamp comprising: a rectifier part that is connected to a ballast to which commercial alternating-current electric power is supplied, and converts the alternating current to direct current; a smoothing capacitor that is provided on an output side of the rectifier part, and removes an alternating-current component included in direct current outputted from the output side; a drive circuit that has a switching element, and performs on-off control on electric current flowing to a plurality of solid-state light-emitting elements connected in series to both ends of the smoothing capacitor; and an inductor that is provided in an electric power supply system between the ballast and the smoothing capacitor. ### Claim 2 (depends on 1) The lighting control circuit for the illuminating lamp according to claim 1, wherein a high-frequency coil is used as the inductor. ### Claim 3 (depends on 1) The lighting control circuit for the illuminating lamp according to claim 1, wherein a high-frequency coil provided between the smoothing capacitor and the output side of the rectifier part is used as the inductor. ### Claim 4 (depends on 1) The lighting control circuit for the illuminating lamp according to claim 1, wherein a pair of high-frequency coils provided between the ballast and an input side of the rectifier part is used as the inductor. ### Claim 5 (depends on 1) The lighting control circuit for the illuminating lamp according to claim 1, wherein a high-frequency coil provided between the smoothing capacitor and the output side of the rectifier part, and a pair of high-frequency coils provided between the ballast and an input side of the rectifier part are used as the inductor. ### Claim 6 (depends on 1) The lighting control circuit for the illuminating lamp according to claim 1, wherein a high-frequency coil is used as the inductor, and inductance of the high-frequency coil is between 100 μH and 1 mH. ### Claim 7 (depends on 3) The lighting control circuit for the illuminating lamp according to claim 3, wherein the plurality of solid-state light-emitting elements connected in series is included in a series luminous body, and a plurality of series luminous bodies is connected in parallel. ### Claim 8 (depends on 7) The lighting control circuit for the illuminating lamp according to claim 7, wherein a bridge-type full-wave rectifier circuit having a constant voltage diode constitutes the rectifier part. ### Claim 9 (depends on 8) The lighting control circuit for the illuminating lamp according to claim 8, wherein the drive circuit has a control IC that detects electric current flowing to the series luminous body, and performs on-off control on the switching element such that the electric current flowing to the series luminous body is constant. ### Claim 10 A straight tube illuminating lamp, in a straight tube each one of both ends of which is sealed by a base having a pair of electrode pins, comprising: a lighting control circuit, the lighting control circuit including: a rectifier part that is connected to a ballast to which commercial alternating-current electric power is supplied, and converts the alternating current to direct current; a smoothing capacitor that is provided on an output side of the rectifier part, and removes an alternating-current component included in direct current outputted from the output side; a plurality of solid-state light-emitting elements that is connected in series to both ends of the smoothing capacitor; a drive circuit in which a switching element is provided, and that performs on-off control on electric current flowing to the plurality of solid-state light-emitting elements; and an inductor that is provided in an electric power supply system between the ballast and the smoothing capacitor, and increases impedance of the smoothing capacitor seen by the ballast. ### Claim 11 (depends on 10) The straight tube illuminating lamp according to claim 10, wherein in the straight tube, a circuit board that extends in a longitudinal direction of the straight tube is provided, and the plurality of solid-state light-emitting elements is provided on one surface side of the circuit board, and the lighting control circuit is provided on the other side of the circuit board. ### Claim 12 (depends on 11) A lighting device comprising: a reflecting umbrella used for a straight tube fluorescent lamp; a pair of sockets that is provided at both ends of the reflecting umbrella at intervals; and a ballast for a fluorescent lamp to which commercial alternating-current electric power is supplied; wherein the pair of electrode pins of the illuminating lamp according to claim 11 is connected to the pair of sockets.