Power-free LED lamp strip
By connecting LED beads and resistors in parallel and series to form an independent power supply circuit, the problems of low yield and poor stability of existing power-free LED light strips are solved, achieving high yield and stability and reducing usage costs.
Patent Information
- Application Number
- CN202520610106.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-04-02
AI Technical Summary
The low yield and poor stability of existing power-free LED light strips are due to the fact that the LED beads and resistors are all connected in series, which means that if one LED bead or resistor is broken, the entire module will be broken and cannot be lit.
The LED beads and resistors are connected in parallel in pairs, and then the parallel LED beads and resistors are connected in series to form a light-emitting module with an operating voltage equal to that of the mains power, thus forming an independent power supply circuit. This ensures that the light-emitting module can still light up normally even if one LED bead or resistor is open-circuited.
This improved the product yield and stability, ensuring that the light-emitting module could still function normally in the event of a malfunction, and reduced the cost of use.
Smart Images
Figure CN223975984U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to LED lighting fixtures, and specifically discloses a power-free LED light strip. Background Technology
[0002] Because LED chips can only conduct in one direction and have non-linear voltage-current characteristics, they cannot be directly connected to mains power. Therefore, traditional LED light strips require a driver power supply, which is known in the industry as powered LED light strips. However, powered LED light strips have disadvantages such as high cost and inconvenience. Therefore, the industry has developed power-free LED light strips. Power-free LED light strips have the rectifier circuit of the driver power supply set on the LED light strip circuit board, allowing the LED light strip to be directly connected to mains power. The circuit of existing power-free LED light strips includes a surface-mount bridge rectifier and an LED light-emitting module connected to the output of the surface-mount bridge rectifier. The LED light-emitting module consists of multiple LED chips and resistors connected in series, and its operating voltage is 220V. Because the LED chips and resistors are all connected in series, if one LED chip or resistor in the light-emitting module has an open circuit or poor soldering, the entire LED light-emitting module will be open-circuited and will not light up. Therefore, existing power-free LED light strips have disadvantages such as low yield and poor stability. Utility Model Content
[0003] Therefore, it is necessary to provide a power-free LED light strip with high yield and good stability to address the existing technical problems.
[0004] To address the problems of existing technologies, this utility model discloses a power-free LED light strip, comprising an outer sheath, inside which is wrapped a core wire, within which two power conductors are disposed. Multiple circuit boards are also wrapped within the core wire, and the circuit boards are configured with multiple LED beads, several resistors, and a surface-mount bridge rectifier. The circuit board is electrically connected to the two power conductors via leads. The two input terminals of the surface-mount bridge rectifier are respectively connected to the two power conductors, and its output terminals include a positive power terminal and a negative power terminal. Each pair of LED beads is connected in parallel to form a parallel LED bead, and each pair of resistors is connected in parallel to form a parallel resistor. The parallel LED beads and parallel resistors are connected in series to form a light-emitting module with an operating voltage equal to that of the mains power. The positive terminal of the light-emitting module is connected to the positive power terminal, and its negative terminal is connected to the negative power terminal.
[0005] The beneficial effects of this utility model are as follows: Since this utility model first connects two LED beads in parallel and two resistors in parallel, and then connects the parallel LED beads and parallel resistors in series to form a light-emitting module with a working voltage equal to that of the mains power, the light-emitting module can still light up normally even if one LED bead and resistor are open-circuited during product use, resulting in high product stability.
[0006] As an improvement to this utility model: the working voltage of the LED lamp bead is 3V, and the working voltage of the light-emitting module is 220V. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the LED light strip structure of this utility model.
[0008] Figure 2 This is a schematic diagram of the circuit structure of this utility model. Detailed Implementation
[0009] To further understand the features, technical means, specific purpose, and function of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.
[0010] refer to Figure 1 and Figure 2 A power-free LED light strip includes an outer sheath 1, inside which a core wire 2 is wrapped. Two power conductors 21 are disposed in the core wire 2. Multiple circuit boards 3 are wrapped inside the core wire 2. Multiple LED beads 4, several resistors R and surface-mount bridge rectifier DB are disposed on the circuit boards 3. The circuit boards 3 are electrically connected to the two power conductors 21 through two leads 5.
[0011] The circuit structure of the aforementioned power-free LED light strip includes: the two input terminals of the surface-mount bridge rectifier DB are respectively connected to the neutral wire circuit N and the live wire circuit L, i.e., the two power supply wires 21, and its output terminals include a positive power supply V+ and a negative power supply V-. The LED beads 4 operate at 3V, and every two LED beads 4 are connected in parallel to form a parallel bead 40. Every two resistors R are connected in parallel to form a parallel resistor R11. The parallel bead 40 and the parallel resistor R11 are connected in series to form a light-emitting module 400 with an operating voltage of 220V. The positive terminal of the light-emitting module 400 is connected to the positive power supply V+, and its negative terminal is connected to the negative power supply V-. In this way, each circuit board 3 forms an independent power supply circuit, and multiple circuit board segments are connected in parallel to the two power supply wires 21. The operating voltage of the light-emitting module 400 of each circuit board segment is equal to that of the mains power. The LED light strip containing one or more circuit board segments can be cut and directly connected to the mains power for use without the need for an external power supply. It is convenient to use and has low operating costs.
[0012] This invention first connects two LED beads in parallel and two resistors in parallel, and then connects the parallel LED beads and parallel resistors in series to form a light-emitting module with a working voltage of 220V. During product use, even if one LED bead or resistor is open-circuited, the light-emitting module can still light up normally, resulting in high product stability.
[0013] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A power-free LED lamp strip, comprising an outer skin, a core wire wrapped in the outer skin, two power supply wires arranged in the core wire, a plurality of circuit boards wrapped in the core wire, a plurality of LED lamp beads, a plurality of resistors and a plurality of patch bridge stacks arranged on the circuit boards, and the circuit boards being electrically connected to the two power supply wires through lead wires, characterized in that: The two input ends of the patch bridge stack are connected to the two power supply wires respectively, and the output end includes a power supply positive pole and a power supply negative pole; each two of the LED lamp beads are connected in parallel to form parallel lamp beads, and each two of the resistors are connected in parallel to form parallel resistors; the parallel lamp beads and the parallel resistors are connected in series to form a light-emitting module with a working voltage equal to that of commercial power; the positive pole of the light-emitting module is connected to the power supply positive pole, and the negative pole of the light-emitting module is connected to the power supply negative pole.
2. The power-free LED light strip of claim 1, wherein: The working voltage of the LED lamp beads is 3V, and the working voltage of the light-emitting module is 220V.