LED lamp string convenient to connect in series

Abstract

The LED lamp string comprises a plug, a power module, a tail plug and a plurality of LED supports which are connected in series, the plug is connected with the input end of the power module, and the output end of the power module is connected with an anode connecting line, a cathode connecting line and a lamp bead connecting line to form a three-wire side-by-side structure. The LED support is provided with four bonding pads, the LED chip is connected between the upper bonding pad and the lower bonding pad and connected with an external power source through the lamp bead connecting line, and the left side and the right side of the LED chip are connected with the positive electrode connecting line and the negative electrode connecting line respectively. The positive and negative pole input ends of the tail plug are connected with the positive pole connecting line, the lamp bead connecting line and the negative pole connecting line correspondingly, and continuous series connection of the multiple LED lamp strings is achieved. Compared with a traditional low-voltage parallel lamp string, the high-voltage direct-current power supply mode has the advantages of being low in cost, high in efficiency, long in series connection length, convenient and fast to install and the like, and is suitable for large-scale decorative lighting scenes.

Description

Technical Field

[0001] This utility model relates to the field of LED light string technology, and in particular to an LED light string that is easy to connect in series. Background Technology

[0002] LED string lights are widely used in various fields such as holiday decorations, urban lighting, and home lighting due to their advantages such as energy saving, high brightness, and long lifespan. Existing LED string lights mainly adopt a low-voltage power supply parallel structure, that is, providing a parallel circuit for multiple LED beads through a low-voltage power supply. The advantage of this structure is its high safety and suitability for close-range use, but it also has several drawbacks:

[0003] 1. Severe line attenuation: When the LED string is long, the voltage will attenuate significantly during transmission, resulting in reduced brightness of the LEDs at the end and affecting the overall visual effect.

[0004] 2. Complex connection: Parallel structures usually require multiple plugs, adapters and power connection points, which not only increases the amount of wiring work in the actual installation process, but also affects the aesthetics and safety.

[0005] 3. High cost: Low-voltage power supplies require a large current to support the operation of many LEDs, resulting in a large load on the power module and high component and maintenance costs.

[0006] 4. Poor scalability: Existing low-voltage LED light strings are not easy to expand quickly. Each group of light strings is usually powered independently, and it is not easy to directly connect multiple strings in series.

[0007] Therefore, there is an urgent need for an LED string solution with a more optimized structure, simpler connection, and long-distance power supply capability to overcome the shortcomings of existing technologies in terms of connection, cost, and ease of use. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an LED light string that is easy to connect in series, so as to reduce the cost of the light string, improve the convenience of connection, and extend the power supply length of the light string.

[0009] To achieve the above objectives, this utility model provides the following technical solution: an LED string that is easy to connect in series, including a plug, a power module, a tail plug and multiple LED brackets connected in series, wherein the plug is electrically connected to the input terminal of the power module, the positive output terminal of the power module is connected to a positive connection wire and an LED bead connection wire, and the negative output terminal of the power module is connected to a negative connection wire.

[0010] The LED bracket has a first pad and a second pad arranged opposite each other at its upper and lower ends, and a third pad and a fourth pad arranged opposite each other at its left and right ends. An LED chip is electrically connected between the first pad and the second pad. The LED chip connection line is electrically connected to the outer side of the first pad and the second pad. The third pad is electrically connected to the positive electrode connection line. The fourth pad is electrically connected to the negative electrode connection line. The positive electrode connection line and the negative electrode connection line are connected to both sides of the LED bracket. The LED chip connection line is connected to the center of the LED bracket, forming a three-line parallel structure.

[0011] The positive input terminal of the tail plug is connected to the positive connection line, and the negative input terminal of the tail plug is connected to the LED connection line and the negative connection line.

[0012] The plug of the first LED string is connected to an AC power source, and the plugs of the remaining LED strings are plugged into the tail plug of the previous LED string to connect the LED strings in series.

[0013] Furthermore, the power module is a resistive-capacitive power supply.

[0014] Furthermore, both ends of the LED chip are connected to LED gold wires, and the LED gold wires on both sides are bonded to the first pad and the second pad, respectively.

[0015] Furthermore, it also includes a support plate made of thermally conductive material and a buffer plate made of flexible buffer material. The support plate has a honeycomb mesh structure. The LED chip is disposed on the upper surface of the support plate, the support plate is disposed on the upper surface of the buffer plate, and the buffer plate is disposed on the upper surface of the LED bracket.

[0016] Furthermore, thermally conductive silicone grease is uniformly coated between the contact surfaces of the LED chip and the support plate.

[0017] Furthermore, the power module has an internal control circuit, and an externally integrated photosensitive device. The output terminal of the photosensitive device is electrically connected to the input terminal of the control circuit. The positive output terminal of the control circuit is connected to the positive connection line and the lamp bead connection line, and the negative output terminal of the control circuit is connected to the negative connection line.

[0018] Furthermore, the photosensitive device is provided with a transparent protective cover.

[0019] Furthermore, the plug and the tail plug have a self-locking connection structure.

[0020] The beneficial effects of this utility model are:

[0021] (1) Supports high voltage series connection: The 220V AC power connected to the plug is converted into high voltage DC power through the power module, avoiding the line attenuation problem caused by low voltage power supply and realizing long-distance and stable power transmission;

[0022] (2) Optimized structure and convenient connection: Through the three-wire parallel structure (positive connection wire, negative connection wire and lamp bead connection wire), and the design of a unified plug and tail plug interface, multiple LED light strings can be directly connected in series, reducing the number of plugs and improving installation efficiency. At the same time, the three-wire parallel structure provides stable support for the LED bracket, improving the structural stability of the LED bracket during use.

[0023] (3) Cost and energy efficiency advantages: Due to the use of a high-voltage DC system, compared with the traditional low-voltage parallel lamp string, the system current can be reduced while ensuring brightness, thereby reducing energy consumption and device costs;

[0024] (4) Wider range of applications: Compact structure and flexible installation, suitable for large-scale outdoor lighting decoration, architectural outline lighting and other scenarios that require large-scale series connection. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the LED light string that is easy to connect in series in this utility model;

[0026] Figure 2 This is a front view of the LED bracket when the LED chip is not connected.

[0027] Figure 3 This is a three-dimensional structural diagram of the LED bracket in this utility model;

[0028] Figure 4 This is a side sectional view of the support plate, buffer plate, and thermal grease in this utility model.

[0029] Reference numerals: 1. Plug; 2. Power module; 3. Tail plug; 4. LED bracket; 5. Positive connection wire; 6. LED bead connection wire; 7. Negative connection wire; 8. First pad; 9. Second pad; 10. Third pad; 11. Fourth pad; 12. LED chip; 13. LED gold wire; 14. Support plate; 15. Buffer plate; 16. Thermal grease. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0031] Example 1, referring to Figures 1 to 3 This is the first embodiment of the present invention. This embodiment provides an LED light string that is easy to connect in series, which can reduce the cost of the light string, improve the convenience of connection, and extend the power supply length of the light string. It includes a plug 1, a power module 2, a tail plug 3, and multiple LED brackets 4 connected in series. The plug 1 is electrically connected to the input end of the power module 2. The positive output end of the power module 2 is connected to a positive connection line 5 and an LED bead connection line 6. The negative output end of the power module 2 is connected to a negative connection line 7.

[0032] The LED bracket 4 has a first pad 8 and a second pad 9 arranged opposite each other at its upper and lower ends, and a third pad 10 and a fourth pad 11 arranged opposite each other at its left and right ends. An LED chip 12 is electrically connected between the first pad 8 and the second pad 9. The outer sides of the first pad 8 and the second pad 9 are electrically connected to the lamp bead connecting line 6. The third pad 10 is electrically connected to the positive terminal connecting line 5, and the fourth pad 11 is electrically connected to the negative terminal connecting line 7. The positive terminal connecting line 5 and the negative terminal connecting line 7 are connected to the two sides of the LED bracket 4, and the lamp bead connecting line 6 is connected to the center of the LED bracket 4, forming a three-line parallel structure.

[0033] The positive input terminal of the tail plug 3 is connected to the positive connection wire 5, and the negative input terminal of the tail plug 3 is connected to the LED connection wire 6 and the negative connection wire 7.

[0034] The plug 1 of the frontmost LED string is connected to the AC power supply, and the plug 1 of the remaining LED strings is plugged into the tail plug 3 of the previous LED string to connect the LED strings in series.

[0035] Working principle of Example 1:

[0036] The plug 1 of the LED string at the front is connected to the AC power supply (220V) and input to the power module 2. The power module 2 converts the AC power into high voltage DC output. The high voltage DC output includes three independent lines: positive connection line 5, negative connection line 7, and LED bead connection line 6.

[0037] LED bracket 4 structure: Each LED bracket 4 has a first solder pad 8 and a second solder pad 9 at its upper and lower ends, respectively, and LED chips 12 are connected between them; each LED bracket 4 has a third solder pad 10 and a fourth solder pad 11 at its left and right ends, respectively, which are connected to the positive terminal connection line 5 and the negative terminal connection line 7; the lamp bead connection line 6 is connected to the outside of the first solder pad 8 and the second solder pad 9 of the LED bracket 4 to form a series channel.

[0038] The three connecting lines form a three-line parallel wiring structure in the LED bracket 4, allowing the three connecting lines to be laid out in parallel along a fixed direction in the LED bracket 4. This not only simplifies the internal structural design and improves assembly efficiency, but also provides a uniform stress distribution, enhancing the structural stability of the LED bracket 4 during use. It can effectively prevent solder joint detachment or bracket deformation caused by loose cables, pulling, or vibration. At the same time, this structure facilitates circuit maintenance and testing, improving the overall reliability and safety of the system.

[0039] Tail plug 3 connection and series connection method: Each LED string has a tail plug 3 at the end, the positive input end of which is connected to the positive connection line 5; the negative input end is connected to both the LED bead connection line 6 and the negative connection line 7; the plug 1 that is not connected to the AC power supply is connected to the tail plug 3 of the previous LED string, thereby realizing the seamless series connection of multiple LED strings.

[0040] The positive terminal connection line 5 and the negative terminal connection line 7 are respectively connected to both sides of each LED bracket 4, and the power supply main line is connected through the third solder pad 10 and the fourth solder pad 11; the LED bead connection line 6 is connected to the first solder pad 8 and the second solder pad 9 in the center of each LED bracket 4, driving the LED chip 12 soldered therein to emit light; the current flows through multiple LED chips 12 in the LED bracket 4 in sequence, thereby realizing the continuous light emission effect of the light string.

[0041] This embodiment not only has a clear structure and stable electrical connection, but also has good compatibility and scalability. It can be used to build large-scale continuous lighting systems, effectively reducing the cost of light strings, improving connection convenience, and extending the power supply length of light strings.

[0042] Preferably, power module 2 is a resistive-capacitive power supply.

[0043] Specifically, in this embodiment, the RC power supply has a simple structure, small size, and low cost, making it suitable for LED lighting scenarios with low current requirements. By using a built-in capacitor and current-limiting resistor to step down and rectify the mains power, it can directly provide a stable high-voltage DC output. This simplifies the configuration of large components such as transformers and inductors in traditional power supplies, effectively reducing system costs and shrinking the overall lamp size, making it suitable for the need for multiple LEDs to be used in series in this embodiment.

[0044] Preferably, both ends of the LED chip 12 are connected to LED gold wires 13, and the LED gold wires 13 on both sides are bonded to the first pad 8 and the second pad 9 respectively.

[0045] Specifically, in this embodiment, gold wire bonding offers excellent conductivity and connection reliability, making it a widely adopted process in modern LED packaging. This embodiment not only ensures the electrical connection stability of the LED chip 12 but also improves product consistency and lifespan. Combined with the aforementioned three-wire parallel structure, the internal wire distribution of the LED bracket 4 is orderly, the chip placement and soldering space is clear, and the overall structure is more stable, with stronger tensile and compressive strength, making it suitable for long-term outdoor use or operation in environments with high vibration or stress.

[0046] Example 2, refer to Figure 4 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a support plate 14, a buffer plate 15, and thermally conductive silicone grease 16. This improves heat dissipation efficiency while also enhancing the physical protection and electrical stability of the LED chip 12. It includes a support plate 14 made of thermally conductive material and a buffer plate 15 made of flexible buffer material. The support plate 14 has a honeycomb mesh structure. The LED chip 12 is disposed on the upper surface of the support plate 14, the upper surface of the support plate 14 is disposed on the upper surface of the buffer plate 15, and the upper surface of the buffer plate 15 is disposed on the upper surface of the LED bracket 4. Preferably, thermally conductive silicone grease 16 is uniformly coated between the contact surfaces of the LED chip 12 and the support plate 14.

[0047] Working principle of Example 2:

[0048] The support plate 14 is made of a highly thermally conductive material, such as aluminum-based or ceramic material, and has a honeycomb mesh structure. This structure increases the airflow area while ensuring overall strength, which is beneficial for rapid heat dissipation. An LED chip 12 is mounted on the upper surface of the support plate 14 to support and fix the chip, while also serving a heat conduction function.

[0049] The buffer plate 15 is made of flexible buffer material, such as silicone rubber or polyurethane foam, and is set on the upper surface of the LED bracket 4 for shock absorption. The support plate 14 is set on the upper surface of the buffer plate 15, forming a composite structure of "buffering + heat conduction + light emission", which effectively improves the structural stability and reliability of the whole lamp under working conditions such as transportation, vibration or thermal expansion and contraction.

[0050] To further enhance the heat dissipation of the chip, thermal grease 16 is uniformly coated between the contact surfaces of the LED chip 12 and the support plate 14. The thermal grease 16 has excellent thermal conductivity and flexibility, which can fully fill the tiny gaps between the chip and the support plate 14, reduce thermal resistance, improve the thermal conductivity efficiency of the LED chip 12, and extend its working life.

[0051] This embodiment is particularly suitable for LED string applications requiring high brightness and long-term continuous operation. While improving heat dissipation efficiency, it also strengthens the physical protection and electrical stability of the chip, further enhancing the overall performance of the LED string.

[0052] Example 3, the third embodiment of this utility model, differs from the previous embodiment in that it provides a control circuit and a photosensitive device, enabling intelligent response and energy saving of the LED light string. The power module 2 has a control circuit internally, and a photosensitive device is integrated externally. The output terminal of the photosensitive device is electrically connected to the input terminal of the control circuit. The positive output terminal of the control circuit is connected to the positive connection line 5 and the LED bead connection line 6, and the negative output terminal of the control circuit is connected to the negative connection line 7. Preferably, the photosensitive device is provided with a transparent protective cover.

[0053] Working principle of Example 3:

[0054] The power module 2 has an internal control circuit to automatically control the on / off state of the LED string. This control circuit may include components such as a light-controlled trigger chip, a voltage comparator, and a power control transistor, which are used to receive external control signals and control the power output state.

[0055] The power module 2 has an externally integrated photosensitive device, such as a photoresistor, photodiode, or integrated photosensor module, used to detect ambient light intensity in real time. The output of this photosensitive device is electrically connected to the input of the control circuit. When the ambient light intensity is lower than a set threshold, the photosensitive device outputs a control signal to the control circuit, triggering it to conduct.

[0056] Specifically, the positive output terminal of the control circuit is connected to the positive connection line 5 and the LED bead connection line 6 to provide driving voltage for the LED string; the negative output terminal is connected to the negative connection line 7, forming a complete output circuit. During the day or when there is sufficient light, the control circuit is in the off state, and the LED string is powered off and does not light up; while at night or when there is insufficient light, the control circuit is turned on, and the string of lights automatically lights up, exhibiting good intelligent response characteristics and energy-saving effect.

[0057] To improve the durability and environmental adaptability of the photosensitive device, a transparent protective cover is provided on the outside. The protective cover can be made of high light transmittance PC material or tempered glass, and has dustproof, waterproof and UV resistance capabilities, which can extend the service life of the photosensitive device and improve detection accuracy.

[0058] Preferably, the plug 1 and the tail plug 3 have a self-locking connection structure.

[0059] Specifically, in this embodiment, to improve the connection strength and safety between multiple LED light strings, the plug 1 and the tail plug 3 adopt a self-locking connection structure. A rotating latch structure or an elastic locking tooth structure is provided between the plug 1 and the tail plug 3, which automatically locks after insertion to prevent loosening or power failure due to external pulling, ensuring the stability of the electrical connection and ease of use. The above is only a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A string of LED lamps that facilitates daisy-chaining, characterized by: It includes a plug (1), a power module (2), a tail plug (3) and multiple LED brackets (4) connected in series. The plug (1) is electrically connected to the input terminal of the power module (2). The positive output terminal of the power module (2) is connected to a positive connection line (5) and an LED connection line (6). The negative output terminal of the power module (2) is connected to a negative connection line (7). The LED bracket (4) has a first pad (8) and a second pad (9) arranged opposite to each other at its upper and lower ends. The LED bracket (4) has a third pad (10) and a fourth pad (11) arranged opposite to each other at its left and right ends. An LED chip (12) is electrically connected between the first pad (8) and the second pad (9). The outer sides of the first pad (8) and the second pad (9) are electrically connected to the lamp bead connecting line (6). The third pad (10) is electrically connected to the positive electrode connecting line (5). The fourth pad (11) is electrically connected to the negative electrode connecting line (7). The positive electrode connecting line (5) and the negative electrode connecting line (7) are connected to both sides of the LED bracket (4). The lamp bead connecting line (6) is connected to the center of the LED bracket (4), forming a three-line parallel structure. The positive input terminal of the tail plug (3) is connected to the positive connection line (5), and the negative input terminal of the tail plug (3) is connected to the lamp bead connection line (6) and the negative connection line (7). The plug (1) of the frontmost LED string is connected to an AC power source, and the plugs (1) of the remaining LED strings are plugged into the tail plug (3) of the previous LED string to connect the LED strings in series.

2. The LED light string of claim 1, wherein: The power module (2) is a resistor-capacitor power supply.

3. The LED light string of claim 1, wherein: Both ends of the LED chip (12) are connected to LED gold wires (13), and the LED gold wires (13) on both sides are bonded to the first pad (8) and the second pad (9) respectively.

4. The LED light string of claim 1, wherein: It also includes a support plate (14) made of thermally conductive material and a buffer plate (15) made of flexible buffer material. The support plate (14) has a honeycomb mesh structure. The LED chip (12) is disposed on the upper surface of the support plate (14). The support plate (14) is disposed on the upper surface of the buffer plate (15). The buffer plate (15) is disposed on the upper surface of the LED bracket (4).

5. The LED light string of claim 4, wherein: Thermal grease (16) is uniformly coated between the contact surfaces of the LED chip (12) and the support plate (14).

6. The LED light string of claim 1, wherein: The power module (2) has a control circuit inside and a photosensitive device integrated outside. The output terminal of the photosensitive device is electrically connected to the input terminal of the control circuit. The positive output terminal of the control circuit is connected to the positive connection line (5) and the lamp bead connection line (6). The negative output terminal of the control circuit is connected to the negative connection line (7).

7. The LED light string of claim 6, wherein: The photosensitive device is covered with a transparent protective cover.

8. The LED light string of claim 1, wherein: The plug (1) and the tail plug (3) are self-locking connection structures.

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