# US 9,521,718 B2 · LED tube lamp having mode switching circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,718 B2 - Document ID: US9521718B2 - Status: Granted - Kind: B2 - Application number: 15/084,483 - Filed: 2016-03-30 - Published: 2016-07-21 - Granted: 2016-12-13 - Earliest claimed: 2014-09-28 - Assignees: Jiaxing Super Lighting Electric Appliance Co., Lti - Applicants: Jiaxing Super Lighting Electric Appliance Co., Ltd - Inventors: Aiming Xiong; Xintong Liu - Web page: https://patentgrep.com/patent/US9521718B2 ## CPC - F21K 9/278: Arrangement or mounting of circuit elements integrated in the light source - H05B 45/3725: Switched mode power supply [SMPS] - F21V 23/006: {the substrate being distinct from the light source holder} - F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes - F21Y 2103/10: comprising a linear array of point-like light-generating elements - F21Y 2115/10: Light-emitting diodes [LED] - H05B 45/375: using buck topology - H05B 45/38: using boost topology - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - 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 - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, 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 The LED tube lamp includes a lamp tube configured to receive an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit, and configured to filter the rectified signal to produce a filtered signal, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal; an LED lighting module coupled to the filtering circuit, wherein the LED lighting module includes a driving circuit having a first driving output terminal and a second driving output terminal and configured to receive the filtered signal to produce a driving signal, and an LED module configured to receive the driving signal and emit light; and a mode switching circuit coupled to at least one of the first and the second filtering output terminal and at least one of the first and the second driving output terminal, and configured to determine to perform one of a first driving mode and a second driving mode. ## Claims ### Claim 1 A light-emitting diode (LED) tube lamp, comprising: a lamp tube, configured to receive an external driving signal; a rectifying circuit, configured to rectify the external driving signal to produce a rectified signal; a filtering circuit, coupled to the rectifying circuit, and configured to filter the rectified signal to produce a filtered signal, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal; an LED lighting module, coupled to the filtering circuit, wherein the LED lighting module includes a driving circuit having a first driving output terminal and a second driving output terminal and configured to receive the filtered signal to produce a driving signal, and an LED module coupled between the first and the second driving output terminals and configured to receive the driving signal and emit light; and a mode switching circuit, coupled to at least one of the first filtering output terminal and the second filtering output terminal and at least one of the first driving output terminal and the second driving output terminal, and configured to select between performing one of a first driving mode and a second driving mode, wherein the LED tube lamp is configured such that the filtered signal is input to the driving circuit in the first driving mode, and the filtered signal is input to the LED module as the driving signal by bypassing the driving circuit in the second driving mode. ### Claim 2 (depends on 1) The LED tube lamp according to claim 1, wherein the mode switching circuit is configured to select between inputting the filtered signal to one of the driving circuit and the LED module based on a frequency of the external driving signal. ### Claim 3 (depends on 1) The LED tube lamp according to claim 1, wherein the mode switching circuit is configured to input the filtered signal to the LED module when a frequency of the external driving signal is higher than a predefined mode switching frequency, and wherein the mode switching circuit is configured to input the filtered signal to the driving circuit when the frequency of the external driving signal is lower than the predefined mode switching frequency. ### Claim 4 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal, and a control pin of the switch is coupled to a controller, a cathode of the diode is coupled to the first filtering output terminal and the first driving output terminal, a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the mode switching circuit. ### Claim 5 (depends on 4) The LED tube lamp according to claim 4, wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal, the first terminal is coupled to the second driving output terminal, the second terminal is coupled to the second filtering output terminal, and the third terminal is coupled to the second pin of the inductor. ### Claim 6 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the mode switching circuit, and a control pin of the switch is coupled to a controller, a cathode of the diode is coupled to the first filtering output terminal and the first driving output terminal, a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the second driving output terminal. ### Claim 7 (depends on 6) The LED tube lamp according to claim 6, wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal, the first terminal is coupled to the second filtering output terminal, the second terminal is coupled to the second driving output terminal, and the third terminal is coupled to the second pin of the switch. ### Claim 8 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal and the second driving output terminal, and a control pin of the switch is coupled to a controller, a cathode of the diode is coupled to the first driving output terminal, a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the mode switching circuit. ### Claim 9 (depends on 8) The LED tube lamp according to claim 8, wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal, the first terminal is coupled to the first filtering output terminal, the second terminal is coupled to the first driving output terminal, and the third terminal is coupled to the second pin of the inductor. ### Claim 10 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal and the second driving output terminal, and a control pin of the switch is coupled to a controller, a cathode of the diode is coupled to the mode switching circuit, a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the first filtering output terminal. ### Claim 11 (depends on 10) The LED tube lamp according to claim 10, wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal, the first terminal is coupled to the first driving output terminal, the second terminal is coupled to the first filtering output terminal, and the third terminal is coupled to the cathode of the diode. ### Claim 12 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to the mode switching circuit, a second pin of the switch is coupled to a cathode of the diode, and a control pin of the switch is coupled to a controller, an anode of the diode is coupled to the second filtering output terminal and the second driving output terminal, a first pin of the inductor is coupled to the second pin of the switch, and a second pin of the inductor is coupled to the first driving output terminal. ### Claim 13 (depends on 12) The LED tube lamp according to claim 12, wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal, the first terminal is coupled to the first filtering output terminal, the second terminal is coupled to the first driving output terminal, and the third terminal is coupled to the first pin of the switch. ### Claim 14 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to the first filtering output terminal, a second pin of the switch is coupled to a cathode of the diode, and a control pin of the switch is coupled to a controller, an anode of the diode is coupled to the second filtering output terminal and the second driving output terminal, a first pin of the inductor is coupled to the second pin of the switch, and a second pin of the inductor is coupled to the mode switching circuit. ### Claim 15 (depends on 14) The LED tube lamp according to claim 14, wherein the mode switching circuit includes a mode switching switch having a first terminal, a second terminal, and a third terminal, the first terminal is coupled to the first driving output terminal, the second terminal is coupled to the first filtering output terminal, and the third terminal is coupled to the second pin of the inductor. ### Claim 16 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the second filtering output terminal, and a control pin of the switch is coupled to a controller, a cathode of the diode is coupled to the mode switching circuit, a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the first filtering output terminal. ### Claim 17 (depends on 16) The LED tube lamp according to claim 16, wherein the mode switching circuit includes a first mode switching switch having a first terminal, a second terminal, and a third terminal, and a second mode switching switch having a fourth terminal, a fifth terminal, and a sixth terminal, the first terminal is coupled to the first driving output terminal, the second terminal is coupled to the first filtering output terminal, the third terminal is coupled to the cathode of the diode, the fourth terminal is coupled to the second driving output terminal, the fifth terminal is coupled to the second filtering output terminal, and the sixth terminal is coupled to the first filtering output terminal. ### Claim 18 (depends on 1) The LED tube lamp according to claim 1, wherein the driving circuit further includes a switch, a diode, and an inductor, a first pin of the switch is coupled to an anode of the diode, a second pin of the switch is coupled to the mode switching circuit, and a control pin of the switch is coupled to a controller, a cathode of the diode is coupled to the first driving output terminal, a first pin of the inductor is coupled to the first pin of the switch, and a second pin of the inductor is coupled to the second driving output terminal. ### Claim 19 (depends on 18) The LED tube lamp according to claim 18, wherein the mode switching circuit includes a first mode switching switch having a first terminal, a second terminal, and a third terminal, and a second mode switching switch having a fourth terminal, a fifth terminal, and a sixth terminal, the first terminal is coupled to the second filtering output terminal, the second terminal is coupled to the second driving output terminal, the third terminal is coupled to the second pin of the switch, the fourth terminal is coupled to the first filtering output terminal, the fifth terminal is coupled to the first driving output terminal, and the sixth terminal is coupled to the second driving output terminal. ### Claim 20 An LED tube lamp, comprising: a lamp tube, configured to receive an external signal; a filtering circuit, configured to filter a received signal and output a filtered signal, the filtered signal derived from the external signal, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal; an LED driving circuit coupled to the filtering circuit and having a first driving output terminal and a second driving output terminal, the driving circuit configured to receive the filtered signal and to produce a driving signal; an LED module coupled to the LED driving circuit and configured to receive the driving signal and emit light; and a mode switching circuit, coupled to at least one of the first filtering output terminal and the second filtering output terminal and at least one of the first driving output terminal and the second driving output terminal, and configured to select between performing one of a first driving mode and a second driving mode, wherein the mode switching circuit is configured to cause the LED driving circuit to operate to receive the filtered signal and produce the driving signal when the first driving mode is selected, and to cause the LED driving circuit to be bypassed in the second driving mode.