LED lamp tube
By setting separate first and second power boards in the LED tube, the problem of excessive space occupied by the driver board is solved, the driving capability of the power circuit and the flexibility of component selection are improved, and a high-brightness tube layout is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-06
AI Technical Summary
When increasing the brightness of existing LED tubes, the driver board occupies too much space, resulting in an unreasonable layout and making it difficult to meet the high brightness requirements.
A separate first power board and a second power board are used, which are located inside the first lamp holder and the second lamp holder respectively to form a power circuit, increasing the space capacity of the power circuit, and power supply is achieved through the connection between the light source board and the power board.
It improves the driving capability of the power circuit and the flexibility of components to meet the high brightness requirements, while avoiding the problem of the driver board occupying too much space.
Smart Images
Figure CN223975891U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lighting fixtures, specifically to an LED tube. Background Technology
[0002] A lamp tube refers to a tubular light fixture, and existing lamp tubes generally use LEDs as the light source. With the rapid development of the lighting industry, increasing the brightness of LED lamp tubes requires increasing the number of LED chips on the LED light source board, as well as increasing the driving capability of the driver power supply. However, this results in the driver board occupying too much space. Therefore, how to rationally arrange lamp tubes to meet the demand for high brightness is a technical problem that urgently needs to be studied in the industry. Utility Model Content
[0003] This utility model provides an LED tube to solve one or more technical problems existing in the prior art, and at least provides a beneficial option or creates conditions.
[0004] This utility model provides an LED lamp tube, comprising: a first lamp holder, a second lamp holder, a lamp tube, a light source board, a first power supply board, and a second power supply board; the light source board is generally strip-shaped and is inserted into the lamp tube, extending along the length of the lamp tube; the first power supply board is located inside the first lamp holder, and the second power supply board is located inside the second lamp holder; one end of the light source board is connected to the first power supply board, and the other end of the light source board is connected to the second power supply board; the first lamp holder is sleeved with one end of the lamp tube, and the second lamp holder is sleeved with the other end of the lamp tube; the soldering circuits on the first power supply board and the second power supply board are combined to form a power supply circuit, which is used to supply power to the light source board.
[0005] Furthermore, the light source board includes: a substrate and a string of LED beads, the substrate is inserted into the lamp tube, the substrate extends along the longitudinal direction of the lamp tube, the string of LED beads is mounted on the front side of the substrate, the string of LED beads is arranged along the longitudinal direction of the substrate, and the back side of the substrate is connected to the inner wall of the lamp tube.
[0006] Furthermore, the substrate is an aluminum component.
[0007] Furthermore, the lamp tube is a frosted glass tube.
[0008] Furthermore, the power supply circuit includes: a live wire terminal, a neutral wire terminal, a surge protection circuit, a leakage protection circuit, a rectifier and filter circuit, a drive circuit, a positive terminal, and a negative terminal; the positive terminal and the negative terminal are respectively connected to the light source board; the live wire terminal is used to connect to an external live wire, the neutral wire terminal is used to connect to an external neutral wire, and the live wire terminal and the neutral wire terminal are used to receive AC power transmitted from the outside;
[0009] The alternating current is input to the rectifier and filter circuit through the surge protection circuit, the surge protection circuit absorbs the surge of the alternating current, and the rectifier and filter circuit is used to rectify and filter the alternating current to obtain the first direct current; the leakage protection circuit provides leakage protection for the first direct current.
[0010] The driving circuit is used to convert the first DC current into a driving current, and the driving current drives the light source board to generate illumination light through the positive and negative terminals.
[0011] Furthermore, the LED tube also includes a fuse, and the live wire is connected to the surge protection circuit through the fuse.
[0012] Furthermore, the surge protection circuit includes: a third capacitor and a second varistor; one end of the fuse is connected to the live wire L, and the other end of the fuse is connected to one end of the second varistor, one end of the third capacitor and the first input terminal of the rectifier filter circuit, respectively; the other end of the second varistor is connected to the other end of the third capacitor, the neutral wire terminal and the second input terminal of the rectifier filter circuit, respectively.
[0013] Furthermore, the rectifier and filter circuit includes: a rectifier bridge, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first varistor, a sixth resistor, and an inductor;
[0014] The leakage protection circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a twentieth resistor, a first capacitor, a second capacitor, a first diode, a second diode, a third diode, a first Zener diode, and a leakage protection chip;
[0015] The first pin of the leakage current protection chip is connected to one end of the third resistor, and the other end of the third resistor is connected to one end of the fourth resistor, one end of the fifth resistor, and the cathode of the first Zener diode, respectively. The eighth pin of the leakage current protection chip is connected to the other end of the fifth resistor, the cathode of the second diode, one end of the fourth capacitor, one end of the sixth resistor, and one end of the first inductor, respectively. The third pin of the leakage current protection chip is connected to the anode of the first diode, and the cathode of the first diode is connected to one end of the second capacitor and one end of the second resistor, respectively. The other end of the second resistor is connected to the anode of the second diode. The fourth pin of the leakage current protection chip is connected to one end of the first capacitor and one end of the first resistor, respectively.
[0016] The other end of the first resistor is connected to the first output terminal of the rectifier bridge, the other end of the fourth capacitor, one end of the fifth resistor, one end of the first varistor, one end of the sixth capacitor, and the negative terminal node, respectively; the sixth pin of the leakage protection chip is connected to one end of the twentieth resistor and the anode of the third diode, respectively; the fifth pin of the leakage protection chip is connected to the other end of the twentieth resistor, the cathode of the third diode, the other end of the first capacitor, the second output terminal of the rectifier bridge, and the second ground terminal, respectively; the other end of the second capacitor, the other end of the fourth resistor, the anode of the first Zener diode, the other end of the sixth resistor, the other end of the first inductor, the other end of the fifth capacitor, the other end of the first varistor, and the other end of the sixth capacitor are respectively connected to the first ground terminal.
[0017] Furthermore, the driving circuit includes: a driving chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a fourth diode, a fifth diode, a sixth diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first electrolytic capacitor, a first transistor, and a transformer;
[0018] The fourth pin of the driver chip is connected to one end of the tenth resistor and one end of the eighth resistor, respectively. The other end of the eighth resistor is connected to one end of the secondary winding of the transformer and the anode of the sixth diode, respectively. The fifth pin of the driver chip is connected to one end of the eighth capacitor, one end of the seventeenth resistor, and one end of the eighteenth resistor, respectively. The other end of the seventeenth resistor is connected to the cathode of the sixth diode, respectively. The other end of the eighteenth resistor is connected to one end of the main winding of the transformer, the negative terminal of the first electrolytic capacitor, one end of the nineteenth resistor, and the negative terminal node, respectively.
[0019] The sixth pin of the driver chip is connected to one end of the fourteenth resistor and the cathode of the fourth diode, the anode of the fourth diode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the other end of the fourteenth resistor, one end of the fifteenth resistor, and the gate of the first transistor.
[0020] The first pin of the driver chip is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the other end of the fifteenth resistor, one end of the sixteenth resistor, and the source of the first transistor; the drain of the first transistor is connected to the anode of the fifth diode and the other end of the main winding of the transformer; the cathode of the fifth diode is connected to the positive terminal of the first electrolytic capacitor, the other end of the nineteenth resistor, and the positive node; the third pin of the driver chip is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to one end of the seventh capacitor and one end of the ninth capacitor.
[0021] The other end of the ninth capacitor is connected to one end of the seventh resistor and one end of the ninth resistor, respectively. The other end of the seventh resistor is connected to the negative terminal. The other end of the ninth resistor, the other end of the tenth resistor, the second pin of the driver chip, the other end of the sixteenth resistor, the other end of the eighth capacitor, and the other end of the secondary winding of the transformer are respectively connected to the first ground terminal.
[0022] Furthermore, the LED string includes: a first sub-LED string, a second sub-LED string, ..., and an i-th sub-LED string; where i = 1, 2, ..., n; n is a positive integer, n ≥ 2; the first sub-LED string, the second sub-LED string, ..., and the i-th sub-LED string are installed on the front side of the substrate, and the first sub-LED string, the second sub-LED string, ..., and the i-th sub-LED string are arranged sequentially along the long dimension of the substrate.
[0023] This invention has at least the following beneficial effects: By setting up a first power board and a second power board 202, the power circuit is divided into two parts, and the space for accommodating the power circuit in the LED tube is increased through the first and second lamp holders. This allows for greater flexibility in the selection of the size and material of the power circuit components, thereby improving the driving capability of the entire power circuit. This invention is mainly used in the field of lighting fixture technology. Attached Figure Description
[0024] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.
[0025] Figure 1 This is an exploded structural diagram of an LED tube;
[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of an LED tube;
[0027] Figure 3 This is a schematic diagram of the power supply circuit. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0029] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0030] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is an exploded structural diagram of an LED tube; Figure 2 This is a schematic diagram of the three-dimensional structure of an LED tube; Figure 3 This is a schematic diagram of the power supply circuit.
[0031] The purpose of this utility model is to provide a reasonable layout structure to meet the requirements of the high-brightness lamp tube 300.
[0032] Therefore, this application provides an LED lamp tube, including: a first lamp holder 101, a second lamp holder 102, a lamp tube 300, a light source board 200, a first power supply board 201, and a second power supply board 202.
[0033] The light source plate 200 is generally strip-shaped and is inserted into the lamp tube 300. The light source plate 200 extends along the long dimension of the lamp tube 300. The first power board 201 is located inside the first lamp head 101, and the second power board 202 is located inside the second lamp head 102. One end of the light source plate 200 is connected to the first power board 201, and the other end of the light source plate 200 is connected to the second power board 202.
[0034] The first lamp holder 101 is sleeved with one end of the lamp tube 300, and the second lamp holder 102 is sleeved with the other end of the lamp tube 300; the welding circuits on the first power board 201 and the second power board 202 are combined to form a power supply circuit, which is used to supply power to the light source board 200.
[0035] The function of the first lamp holder 101 is to seal one end of the lamp tube 300; in related fields, the first lamp holder 101 can also be referred to as the first plug. To allow the first power board 201 to fit into the first lamp holder 101, the size of the first lamp holder 101 needs to be designed to accommodate the first power board 201. To allow the first lamp holder 101 to be connected to mains power, corresponding connecting pins are also provided on the side of the first lamp holder 101.
[0036] The function of the second lamp holder 102 is to seal the other end of the lamp tube 300. In related fields, the second lamp holder 102 can also be referred to as a second plug. To allow the second power board 202 to fit into the second lamp holder 102, the size of the second lamp holder 102 needs to be designed to accommodate the second power board 202. To allow the second lamp holder 102 to be connected to mains power, corresponding connecting pins are also provided on the side of the second lamp holder 102.
[0037] The first power board 201 connects to the light source board 200 via pre-defined solder joints, and the second power board 202 connects to the light source board 200 via pre-defined solder joints.
[0038] In actual operation, the mains power is obtained through the pins in the first lamp holder 101 and the second lamp holder 102, and the light source board 200 is driven by the combined action of the first power board 201 and the second power board 202.
[0039] This invention divides the power circuit into two parts by setting up a first power board 201 and a second power board 202. The first lamp holder 101 and the second lamp holder 102 increase the space available for the LED tube to house the power circuit. This allows for greater flexibility in the selection of the size and material of the power circuit components, thereby improving the overall driving capability of the power circuit.
[0040] In some further embodiments, the light source board 200 includes a substrate and a string of LED beads. The substrate is inserted into the lamp tube 300 and extends along the longitudinal direction of the lamp tube 300. The string of LED beads is mounted on the front side of the substrate and is arranged along the longitudinal direction of the substrate. The back side of the substrate is connected to the inner wall of the lamp tube 300.
[0041] The illumination light emitted by the LED string can be projected outward through the lamp tube 300. In some further embodiments, to make the light emitted by the lamp tube 300 softer, the lamp tube 300 is a frosted glass tube. That is, the lamp tube 300 is made of glass, and the inner wall of the lamp tube 300 is treated with a frosted process. This causes the illumination light to form a Lambertian shape as it passes through the lamp tube 300, avoiding glare from the lamp tube 300. Regarding the substrate material, in some further embodiments, the substrate is an aluminum component. Using aluminum as the substrate material improves the heat dissipation capacity of the substrate, quickly dissipating the heat generated by the LED string, preventing heat accumulation, and improving the operational stability of the LED string.
[0042] In some further specific embodiments, the LED string includes: a first sub-LED string, a second sub-LED string, ..., and an i-th sub-LED string; where i = 1, 2, ..., n; n is a positive integer, n ≥ 2; the first sub-LED string, the second sub-LED string, ..., and the i-th sub-LED string are mounted on the front side of the substrate, and are arranged sequentially along the longitudinal direction of the substrate. By dividing the LED string into multiple sub-LED strings, the fault tolerance can be increased, avoiding the situation where the entire LED tube fails to light up due to a problem with a single LED. Considering production costs, two sub-LED strings are more common, namely the first sub-LED string and the second sub-LED string.
[0043] In some further specific embodiments, the power supply circuit includes: a live wire terminal L, a neutral wire terminal N, a surge protection circuit 401, a leakage protection circuit 403, a rectifier and filter circuit 402, a drive circuit 404, a positive terminal V+, and a negative terminal V-; the positive terminal V+ and the negative terminal V- are respectively connected to the light source board 200; the live wire terminal L is used to connect to an external live wire, the neutral wire terminal N is used to connect to an external neutral wire, and the live wire terminal L and the neutral wire terminal N are used to receive AC power transmitted from the outside.
[0044] The alternating current is input to the rectifier and filter circuit 402 through the surge protection circuit 401. The surge protection circuit 401 absorbs surges in the alternating current. The rectifier and filter circuit 402 rectifies and filters the alternating current to obtain the first direct current. The leakage protection circuit 403 provides leakage protection for the first direct current.
[0045] The driving circuit 404 is used to convert the first DC current into a driving current, and the driving current drives the light source board 200 to generate illumination light through the positive terminal V+ and the negative terminal V-.
[0046] For further protection, the LED tube also includes a fuse F1, and the live wire L is connected to the surge protection circuit 401 through the fuse F1.
[0047] To illustrate the structure of this power supply circuit, in some further specific embodiments, the surge protection circuit 401 includes: a third capacitor C3 and a second varistor VR2. One end of the fuse F1 is connected to the live wire L, and the other end of the fuse F1 is connected to one end of the second varistor VR2, one end of the third capacitor C3, and the first input terminal of the rectifier filter circuit 402. The other end of the second varistor VR2 is connected to the other end of the third capacitor C3, the neutral wire N, and the second input terminal of the rectifier filter circuit 402.
[0048] The rectifier and filter circuit 402 includes: a rectifier bridge BD1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first varistor VR1, a sixth resistor R6, and an inductor L1.
[0049] The leakage current protection circuit 403 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a twentieth resistor R20, a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2, a third diode D3, a first Zener diode ZD1, and a leakage current protection chip U1. The leakage current protection chip U1 is model LT2600G.
[0050] The first pin of the leakage protection chip U1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4, one end of the fifth resistor R5, and the cathode of the first Zener diode ZD1.
[0051] The eighth pin of the leakage protection chip U1 is connected to the other end of the fifth resistor R5, the cathode of the second diode D2, one end of the fourth capacitor C4, one end of the sixth resistor R6, and one end of the first inductor L1.
[0052] The third pin of the leakage current protection chip U1 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to one end of the second capacitor C2 and one end of the second resistor R2. The other end of the second resistor R2 is connected to the anode of the second diode D2. The fourth pin of the leakage current protection chip U1 is connected to one end of the first capacitor C1 and one end of the first resistor R1.
[0053] The other end of the first resistor R1 is connected to the first output terminal of the rectifier bridge BD1, the other end of the fourth capacitor C4, one end of the fifth resistor R5, one end of the first varistor VR1, one end of the sixth capacitor C6, and the negative terminal V-. The sixth pin of the leakage protection chip U1 is connected to one end of the twentieth resistor R20 and the anode of the third diode D3. The fifth pin of the leakage protection chip U1 is connected to the other end of the twentieth resistor R20, the cathode of the third diode D3, the other end of the first capacitor C1, the second output terminal of the rectifier bridge BD1, and the second ground terminal PGND.
[0054] The other end of the second capacitor C2, the other end of the fourth resistor R4, the anode of the first Zener diode ZD1, the other end of the sixth resistor R6, the other end of the first inductor L1, the other end of the fifth capacitor C5, the other end of the first varistor VR1, and the other end of the sixth capacitor C6 are respectively connected to the first ground terminal GND.
[0055] The driving circuit 404 includes: a driving chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first electrolytic capacitor EC1, a first transistor Q1, and a transformer T1. The driving chip U2 is a DIO8650DCST6.
[0056] The fourth pin of the driver chip U2 is connected to one end of the tenth resistor R10 and one end of the eighth resistor R8, respectively. The other end of the eighth resistor R8 is connected to one end of the secondary winding of the transformer T1 and the anode of the sixth diode D6, respectively. The fifth pin of the driver chip U2 is connected to one end of the eighth capacitor C8, one end of the seventeenth resistor R17, and one end of the eighteenth resistor R18, respectively. The other end of the seventeenth resistor R17 is connected to the cathode of the sixth diode D6. The other end of the eighteenth resistor R18 is connected to one end of the main winding of the transformer T1, the negative terminal of the first electrolytic capacitor EC1, one end of the nineteenth resistor R19, and the negative node V-, respectively.
[0057] The sixth pin of the driver chip U2 is connected to one end of the fourteenth resistor R14 and the cathode of the fourth diode D4. The anode of the fourth diode D4 is connected to one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to the other end of the fourteenth resistor R14, one end of the fifteenth resistor R15, and the gate of the first transistor Q1.
[0058] The first pin of the driver chip U2 is connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is connected to the other end of the fifteenth resistor R15, one end of the sixteenth resistor R16, and the source of the first transistor Q1. The drain of the first transistor Q1 is connected to the anode of the fifth diode D5 and the other end of the main winding of the transformer T1. The cathode of the fifth diode D5 is connected to the positive terminal of the first electrolytic capacitor EC1, the other end of the nineteenth resistor R19, and the positive node V+. The third pin of the driver chip U2 is connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to one end of the seventh capacitor C7 and one end of the ninth capacitor C9.
[0059] The other end of the ninth capacitor C9 is connected to one end of the seventh resistor R7 and one end of the ninth resistor R9, respectively. The other end of the seventh resistor R7 is connected to the negative terminal V-. The other end of the ninth resistor R9, the other end of the tenth resistor R10, the second pin of the driver chip U2, the other end of the sixteenth resistor R16, the other end of the eighth capacitor C8, and the other end of the secondary winding of the transformer T1 are respectively connected to the first ground terminal GND.
[0060] In the specific circuit soldering distribution, the leakage protection chip U1 and its surrounding circuitry are mainly soldered into the second power board 202. The driver chip U2 and its surrounding circuitry are mainly soldered into the first power board 201.
[0061] Although the description of this application has been quite detailed and particularly focused on several described embodiments, it is not intended to limit itself to any of these details or embodiments or any particular embodiment. Rather, it should be considered as effectively covering the intended scope of this application by referring to the appended claims and taking into account the broad possible interpretations of these claims provided by the prior art. Furthermore, the foregoing description of this application with respect to embodiments foreseeable by the inventor is intended to provide a useful description, and non-substantial modifications to this application that have not yet been foreseen may still represent equivalent modifications.
Claims
1. An LED tube lamp characterized in that, The application relates to a lamp, which comprises a first lamp cap, a second lamp cap, a lamp tube, a light source plate, a first power supply plate and a second power supply plate; the light source plate is in a strip shape as a whole, is inserted into the lamp tube and extends along the long dimension direction of the lamp tube; the first power supply plate is located in the interior of the first lamp cap, the second power supply plate is located in the interior of the second lamp cap, one end of the light source plate is connected with the first power supply plate, and the other end of the light source plate is connected with the second power supply plate; the first lamp cap is sleeved with one end of the lamp tube, and the second lamp cap is sleeved with the other end of the lamp tube; the welding circuits on the first power supply plate and the second power supply plate are combined to form a power supply circuit, and the power supply circuit is used for power supply of the light source plate. The light source plate comprises a substrate and a lamp bead string; the substrate is inserted into the lamp tube, extends along the long dimension direction of the lamp tube, the lamp bead string is installed on the front side of the substrate, and the lamp bead string is arranged along the long dimension direction of the substrate; the back side of the substrate is connected with the inner wall of the lamp tube.
2. The LED tube lamp of claim 1, wherein, The substrate is an aluminum material member.
3. The LED tube lamp of claim 2, wherein, The lamp tube is a glass frosted tube.
4. The LED tube lamp of claim 1, wherein, The power supply circuit comprises a live wire end, a zero line end, a surge protection circuit, a leakage protection circuit, a rectification filter circuit, a driving circuit, a positive node and a negative node; the positive node and the negative node are connected with the light source plate respectively; the live wire end is used for being connected with an external live wire, the zero line end is used for being connected with an external zero line, and the live wire end and the zero line end are used for receiving external incoming alternating current; 5. The LED tube lamp of claim 1, wherein, The alternating current is input into the rectification filter circuit through the surge protection circuit, the surge protection circuit absorbs surges of the alternating current, and the rectification filter circuit is used for rectifying and filtering the alternating current to obtain first direct current; the leakage protection circuit is used for leakage protection of the first direct current; The driving circuit is used for converting the first direct current into driving current, and the driving current drives the light source plate to generate illumination light through the positive node and the negative node. The application further comprises a fuse, and the live wire end is connected with the surge protection circuit through the fuse.
6. An LED tube lamp according to claim 5, characterized in that The surge protection circuit comprises a third capacitor and a second pressure sensitive resistor; one end of the fuse is connected with the live wire end L, the other end of the fuse is connected with one end of the second pressure sensitive resistor, one end of the third capacitor and a first input end of the rectification filter circuit respectively, and the other end of the second pressure sensitive resistor is connected with the other end of the third capacitor, the zero line end and a second input end of the rectification filter circuit respectively.
7. An LED tube lamp according to claim 6, characterized in that The rectification filter circuit comprises a rectification bridge, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first pressure sensitive resistor, a sixth resistor and an inductor.
8. The LED tube lamp of claim 5, wherein, The leakage protection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a twentieth resistor, a first capacitor, a second capacitor, a first diode, a second diode, a third diode, a first voltage stabilizing diode and a leakage protection chip. The first pin of the leakage protection chip is connected with one end of the third resistor, and the other end of the third resistor is connected with one end of the fourth resistor, one end of the fifth resistor and the cathode of the first voltage stabilizing diode respectively; the eighth pin of the leakage protection chip is connected with the other end of the fifth resistor, the cathode of the second diode, one end of the fourth capacitor, one end of the sixth resistor and one end of the first inductor respectively; the third pin of the leakage protection chip is connected with the anode of the first diode, and the cathode of the first diode is connected with one end of the second capacitor and one end of the second resistor respectively; the other end of the second resistor is connected with the anode of the second diode; the fourth pin of the leakage protection chip is connected with one end of the first capacitor and one end of the first resistor respectively; The other end of the first resistor is connected with the first output end of the rectifier bridge, the other end of the fourth capacitor, one end of the fifth resistor, one end of the first voltage sensitive resistor, one end of the sixth capacitor and the negative node respectively; the sixth pin of the leakage protection chip is connected with one end of the twentieth resistor and the anode of the third diode respectively; the fifth pin of the leakage protection chip is connected with the other end of the twentieth resistor, the cathode of the third diode, the other end of the first capacitor, the second output end of the rectifier bridge and the second ground end respectively; the other end of the second capacitor, the other end of the fourth resistor, the anode of the first voltage stabilizing diode, the other end of the sixth resistor, the other end of the first inductor, the other end of the fifth capacitor, the other end of the first voltage sensitive resistor and the other end of the sixth capacitor are connected with the first ground end respectively.
9. The LED tube lamp of claim 5, wherein, The driving circuit comprises a driving chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a fourth diode, a fifth diode, a sixth diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first electrolytic capacitor, a first triode and a transformer; The fourth pin of the driving chip is connected with one end of the tenth resistor and one end of the eighth resistor respectively, and the other end of the eighth resistor is connected with one end of the secondary winding of the transformer and the anode of the sixth diode respectively; the fifth pin of the driving chip is connected with one end of the eighth capacitor, one end of the seventeenth resistor and one end of the eighteenth resistor respectively, and the other end of the seventeenth resistor is connected with the cathode of the sixth diode; the other end of the eighteenth resistor is connected with one end of the primary winding of the transformer, the negative electrode of the first electrolytic capacitor, one end of the nineteenth resistor and the negative node respectively; The sixth pin of the driving chip is connected with one end of the fourteenth resistor and the cathode of the fourth diode respectively, the anode of the fourth diode is connected with one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected with the other end of the fourteenth resistor, one end of the fifteenth resistor and the gate of the first triode respectively; The first pin of the driving chip is connected with one end of the twelfth resistor, the other end of the twelfth resistor is connected with the other end of the fifteenth resistor, one end of the sixteenth resistor and the source electrode of the first triode respectively; the drain electrode of the first triode is connected with the anode of the fifth diode and the other end of the main winding of the transformer respectively; the cathode of the fifth diode is connected with the positive electrode of the first electrolytic capacitor, the other end of the nineteenth resistor and the positive node respectively; the third pin of the driving chip is connected with one end of the eleventh resistor, the other end of the eleventh resistor is connected with one end of the seventh capacitor and one end of the ninth capacitor respectively; The other end of the ninth capacitor is connected with one end of the seventh resistor and one end of the ninth resistor respectively, the other end of the seventh resistor is connected with the negative node; the other end of the ninth resistor, the other end of the tenth resistor, the second pin of the driving chip, the other end of the sixteenth resistor, the other end of the eighth capacitor and the other end of the secondary winding of the transformer are connected with the first ground terminal respectively.
10. The LED tube lamp of claim 2, wherein, The lamp bead string comprises: a first sub-lamp bead string, a second sub-lamp bead string, and an i-th sub-lamp bead string; wherein i=1, 2, …, n; n is a positive integer, n≥2; the first sub-lamp bead string, the second sub-lamp bead string, and the i-th sub-lamp bead string are installed on the front side of the substrate, and the first sub-lamp bead string, the second sub-lamp bead string, and the i-th sub-lamp bead string are sequentially arranged along the long dimension direction of the substrate.