# US 2014/0197748 A1 · LED Lighting Tube > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197748 A1 - Document ID: US20140197748A1 - Status: Published application - Kind: A1 - Application number: 13/949,313 - Filed: 2013-07-24 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Luxul Technology Incorporation - Applicants: Luxul Technology Incorporation - Inventors: Cheng-Hung Pan; Perng-Fei Yuh - Web page: https://patentgrep.com/patent/US20140197748A1 ## CPC - H05B 45/30: Driver circuits - H05B 45/37: Converter circuits - H05B 45/3578: Emulating the electrical or functional characteristics of discharge lamps - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract The LED lighting tube that is compatible with an electronic ballast has two snubber circuits, a waveform conversion circuit, and at least one LED light string. The snubber circuits are connected to terminals of the LED lighting tube, and input terminals of each snubber circuit are connected to electrode pins of a corresponding terminal, and each snubber circuit has at least one resistor connected in series between the electrode pins of the corresponding terminal. The waveform conversion circuit has multiple rectifier diodes, wherein input terminals of the waveform conversion circuit are respectively connected to output terminals of the snubber circuits, wherein a recovery time of each rectifier diode is under 2.5 us. Two ends of the at least one LED light string are respectively connected to output terminals of the waveform conversion circuit, wherein each one of the at least one LED light string comprises multiple LED units connected in series. ## Claims ### Claim 1 An LED lighting tube compatible with an electronic ballast, the LED lighting tube comprising: two terminals, each terminal having two electrode pins; two snubber circuits respectively connected to the two terminals, and two input terminals of each snubber circuit respectively connected to the two electrode pins of a corresponding terminal; each snubber circuit having at least one resistor connected in series between the two electrode pins of the corresponding terminal; a waveform conversion circuit having multiple rectifier diodes and having input terminals connected to output terminals of the snubber circuits, wherein a recovery time of each rectifier diode is under 2.5 us; and at least one LED light string having two ends respectively connected to output terminals of the waveform conversion circuit, wherein each one of the at least one LED light string comprises multiple LED units connected in series. ### Claim 2 (depends on 1) The LED lighting tube as claimed in claim 1, wherein the waveform conversion circuit is a full-bridge rectifier circuit. ### Claim 3 (depends on 1) The LED lighting tube as claimed in claim 1, wherein each snubber circuit comprises a resistor connected in series between the corresponding electrode pins and an end of the resistor is the output terminal of the snubber circuit. ### Claim 4 (depends on 2) The LED lighting tube as claimed in claim 2, wherein each snubber circuit comprises a resistor connected in series between the corresponding electrode pins and an end of the resistor is the output terminal of the snubber circuit. ### Claim 5 (depends on 1) The LED lighting tube as claimed in claim 1, wherein each snubber circuit comprises two resistors connected in series between the corresponding electrode pins and a connected node between the resistors is the output terminal of the snubber circuit. ### Claim 6 (depends on 2) The LED lighting tube as claimed in claim 2, wherein each snubber circuit comprises two resistors connected in series between the corresponding electrode pins and a connected node between the two resistors is the output terminal of the snubber circuit. ### Claim 7 (depends on 1) The LED lighting tube as claimed in claim 1, wherein each snubber circuit further comprises multiple resistor circuits connected in parallel and each resistor circuit having two resistors connected in series between the corresponding electrode pins, and a connected node between the two resistors of each resistor circuit is the output terminal of the first snubber circuit. ### Claim 8 (depends on 2) The LED lighting tube as claimed in claim 2, wherein each snubber circuit further comprises multiple resistor circuits connected in parallel and each resistor circuit having two resistors connected in series between the corresponding electrode pins, and a connected node between the two resistors of each resistor circuit is the output terminal of the first snubber circuit. ### Claim 9 (depends on 1) The LED lighting tube as claimed in claim 1, wherein the LED lighting tube further comprises a capacitor connected in parallel with the at least one LED light string. ### Claim 10 (depends on 2) The LED lighting tube as claimed in claim 2, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 11 (depends on 3) The LED lighting tube as claimed in claim 3, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 12 (depends on 4) The LED lighting tube as claimed in claim 4, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 13 (depends on 5) The LED lighting tube as claimed in claim 5, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 14 (depends on 6) The LED lighting tube as claimed in claim 6, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 15 (depends on 7) The LED lighting tube as claimed in claim 7, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 16 (depends on 8) The LED lighting tube as claimed in claim 8, wherein the LED lighting tube further comprises an capacitor connected in parallel with the at least one LED light string. ### Claim 17 (depends on 1) The LED lighting tube as claimed in claim 1, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 18 (depends on 2) The LED lighting tube as claimed in claim 2, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 19 (depends on 3) The LED lighting tube as claimed in claim 3, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 20 (depends on 4) The LED lighting tube as claimed in claim 4, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 21 (depends on 5) The LED lighting tube as claimed in claim 5, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 22 (depends on 6) The LED lighting tube as claimed in claim 6, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 23 (depends on 7) The LED lighting tube as claimed in claim 7, wherein the recovery time of each rectifier diode is under 1 us. ### Claim 24 (depends on 8) The LED lighting tube as claimed in claim 8, wherein the recovery time of each rectifier diode is under 1 us.