A new single-color COB flexible lamp strip without head-to-tail brightness difference
Patent Information
- Application Number
- CN202522162933.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-13
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-10-13
AI Technical Summary
[0002]当电流流过一个电阻时，为了克服电阻对电子流动的阻力，就必须消耗能量，这个被消耗的能量会以热能等形式散失，表现就是在这个电阻元件上产生了电压降落，电流越大，或者电阻越大，需要消耗的能量就越多，因此压降就越大，灯带电路中有压降是正常的现象，但此现象会导致首尾亮度差比较明显，会严重影响客户的实际使用体验
1、每个限流电阻的阻值与对应米段的实际工作电压匹配，以补偿电路压降导致的亮度差异，限流电阻R1和限流电阻R2起到了限流的作用，从而达到目标功率，降低灯带电路首尾的亮度差，满足无感差异要求且价格适中。
Smart Images
Figure CN224920358U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a flexible light strip, and more particularly to a novel monochrome COB flexible light strip with no beginning and end brightness difference, belonging to the field of flexible light strip technology. Background Technology
[0002] When current flows through a resistor, energy must be consumed to overcome the resistance to the flow of electrons. This consumed energy is dissipated in the form of heat, which manifests as a voltage drop across the resistor. The greater the current or the greater the resistance, the more energy is consumed, and therefore the greater the voltage drop. Voltage drop is a normal phenomenon in LED strip circuits, but this phenomenon can lead to a significant difference in brightness between the beginning and end of the LED strip, which will seriously affect the actual user experience.
[0003] Commercially available monochrome COB LED strips are typically sold in 5-meter or 10-meter rolls. Due to limitations in materials and cost, the brightness of the strip at the beginning and end differs significantly, resulting in a poor visual effect after installation and use, leading to a poor user experience for customers.
[0004] There are generally two solutions on the market to solve this problem. Solution 1: Use a constant current IC solution. By controlling the current with a constant current IC, the effect of no brightness difference between the beginning and end can be achieved. This solution provides uniform light emission and high brightness, and can achieve a brightness difference of 20 meters. Customers have a very good experience in testing, but the price is relatively high, which is more inclined to high-end customers and has a smaller customer base. Solution 2: Solve the problem by reducing the number of series and parallel lines. Reducing the number of series lines can provide more spare voltage to the chip. Even at the end of the light strip, the chip can still be provided with a higher operating voltage to achieve a brightness difference between the beginning and end. This solution provides relatively uniform light emission, but the brightness is lower and more heat generation compared to Solution 1. It can achieve a brightness difference of about 10 meters and is relatively cheaper, which is more inclined to low-end customers.
[0005] Therefore, there is an urgent need to improve the single-color COB flexible light strip without brightness difference between the beginning and end to solve the above-mentioned problems. Utility Model Content
[0006] The purpose of this invention is to provide a novel monochrome COB flexible light strip with no brightness difference between the beginning and end. The resistance value of each current-limiting resistor is matched with the actual working voltage of the corresponding meter segment to compensate for the brightness difference caused by the voltage drop in the circuit. The current-limiting resistors R1 and R2 play the role of current limiting, thereby achieving the target power, reducing the brightness difference between the beginning and end of the light strip circuit, meeting the requirement of no noticeable difference, and at a moderate price.
[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include: A novel single-color COB flexible light strip with no beginning and end brightness difference includes: Flexible printed circuit board (FPCB) substrates are produced in rolls according to a preset length, and the first meter of each roll of flexible printed circuit board substrate is marked with a unique serial number. LED light-emitting chip assembly is fixed on the circuit layer pads of the flexible printed FPCB substrate; The LED strip circuit includes an LED chip array arranged in a matrix on the LED strip circuit. The LED strip circuit includes a current-limiting resistor assembly, which includes current-limiting resistors R1 and R2 arranged meter by meter along the length of the LED strip.
[0008] Preferably, one end of the LED strip circuit is connected to a +24V voltage, and the other end is grounded. The LED light-emitting chip group includes LED light-emitting chips D1-D16, and is divided into three groups, specifically: The first group includes two LED light-emitting chip groups connected in series. The first group group one includes LED light-emitting chips D1 and D9 connected in parallel. The first group group two includes LEDs D2 and D10 connected in parallel. The second group includes four LED light-emitting chip groups arranged in series. The first group of the second group includes D3 and D11 arranged in parallel. The second group includes D4 and D12 arranged in parallel. The third group includes D5 and D13 arranged in parallel. The fourth group includes D6 and D14 arranged in parallel. The third group includes two LED light-emitting chip groups connected in series. The first group of the third group includes LED light-emitting chips D7 and D15 connected in parallel. The second group of the third group includes LED chips D8 and D16 connected in parallel. A current-limiting resistor R1 is electrically connected between the first group and the second group, and a current-limiting resistor R2 is electrically connected between the second group and the third group.
[0009] Preferably, the LED light-emitting chips D1-D16 are all monochrome chips with a wavelength range of 500-700nm and a luminous efficacy ≥120lm / W.
[0010] Preferably, the flexible printed FPCB substrate is made by welding 0.5-meter panels together, and each roll is 5 meters or 10 meters long. The first meter of the flexible printed FPCB substrate is marked with the number "1" on the silkscreen, and the subsequent meters are marked with the number "1".
[0011] Preferably, the actual operating voltage of the LED light-emitting chip group is measured using a multimeter, and the resistance value is calculated based on Ohm's law, using the following formula: R= ; Where U is the voltage value; I is the current value; R is the resistance value of the current-limiting resistor.
[0012] Preferably, the current-limiting resistors R1 and R2 are pre-welded onto the flexible printed FPCB substrate.
[0013] Preferably, the circuit layer pads are made of copper-clad laminate with a copper foil thickness of ≥35μm.
[0014] Preferably, the LED light-emitting chip group is provided with an encapsulation layer.
[0015] This utility model has at least the following beneficial effects: 1. The resistance value of each current-limiting resistor is matched with the actual working voltage of the corresponding meter segment to compensate for the brightness difference caused by the voltage drop in the circuit. The current-limiting resistors R1 and R2 play the role of current limiting, thereby achieving the target power, reducing the brightness difference between the beginning and end of the light strip circuit, meeting the requirement of imperceptible difference, and at a reasonable price.
[0016] 2. Current-limiting resistors R1 and R2 are located between the first and second groups and between the second and third groups, respectively. They are used to divide the voltage and limit the current of each group to avoid chip overload. Each parallel group, such as LED chip D1 and LED chip D9, has the same voltage and current is divided. It is suitable to use LED chips of the same specification to ensure consistent brightness. Series grouping: The total voltage of the series group is the sum of the voltages of each parallel group. It is necessary to ensure that the input voltage +24V is sufficient to cover the voltage drop of all series groups and to increase current sharing measures. A current-limiting resistor is connected in series within the parallel group to ensure uniform current distribution and improve stability. The number of series groups can be adjusted according to the actual forward voltage Vf. For example, the second group can be changed to 3 or 5 parallel groups to adapt to different chip parameters and improve the flexibility of grouping. Attached Figure Description
[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is the circuit diagram of this utility model; Figure 2 This is a structural diagram of the flexible printed circuit board (FPCB) substrate of this utility model.
[0018] In the figure, 1. Flexible printed circuit board (FPCB) substrate; 2. LED light-emitting chipset; 3. Circuit layer pads; 4. LED strip circuit; 5. Current-limiting resistor assembly. Detailed Implementation
[0019] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.
[0020] like Figures 1-2 As shown, the novel single-color COB flexible light strip with no beginning and end brightness difference provided in this embodiment includes: a flexible printed FPCB substrate 1, which is produced in rolls according to a preset length. The first meter of each roll of flexible printed FPCB substrate 1 is marked with a unique serial number. The flexible printed FPCB substrate 1 is made by welding 0.5-meter panels together. The length of each roll is 5 meters or 10 meters. The first meter of flexible printed FPCB substrate 1 is marked with the number "1" on the silkscreen, and the subsequent meters are marked with an increasing number. Since it is necessary to match the appropriate resistor for each meter of light strip according to the actual voltage to achieve the target power, in order to prevent light strips of different power from being mixed together during the production process, the flexible printed FPCB substrate 1 is designed to be made into rolls of 5 meters or 10 meters according to the actual customer needs. The first meter of light strip is marked with the number "1" on the FPCB substrate, and so on. This achieves the function of distinguishing power and light strip to ensure the error of the manufacturing process and ensures the feasibility of production from the design. LED light-emitting chip group 2 is fixed on circuit layer pad 3 of flexible printed FPCB substrate 1. LED strip circuit 4, LED light-emitting chip group 2 is matrix arranged on LED strip circuit 4. The matrix arrangement of LED light-emitting chip group 2 can reduce the shadow effect between chips and improve the luminous efficiency by 10%-15% compared with the traditional random arrangement. When a single chip fails, only the corresponding matrix unit needs to be replaced, reducing maintenance costs. The light strip circuit 4 includes a current-limiting resistor component 5, which includes current-limiting resistors R1 and R2 arranged meter by meter along the length of the light strip. The resistance value of each current-limiting resistor is matched with the actual working voltage of the corresponding meter segment to compensate for the brightness difference caused by the voltage drop in the circuit. It is normal for there to be a voltage drop in the light strip circuit 4, but this phenomenon will cause a significant difference in brightness between the beginning and the end, which will seriously affect the actual user experience of the customer. In the light strip design, in order to overcome the resistance of the resistor to the flow of electrons, energy must be consumed. This consumed energy will be dissipated in the form of heat, etc. The actual operating voltage of the LED chip assembly was measured using a multimeter, and the resistance value was calculated based on Ohm's law, using the following formula: R= ; Where U is the voltage value; I is the current value; R is the resistance value of the current-limiting resistor. This means that a voltage drop occurs across this resistor. The greater the current or the greater the resistance, the more energy is required, and therefore the greater the voltage drop. The current-limiting resistors R1 and R2 limit the current, thereby achieving the target power, reducing the brightness difference between the beginning and end of the LED strip circuit 4, and meeting the requirement of non-inductive difference.
[0021] Furthermore, such as Figure 1As shown, one end of the LED strip circuit 4 is connected to a +24V voltage, and the other end is grounded. The LED light-emitting chip group 2 includes LED light-emitting chips D1-D16, and is divided into three groups, specifically: The first group includes two LED light-emitting chip groups connected in series. The first group group one includes LED light-emitting chips D1 and D9 connected in parallel. The first group group two includes LEDs D2 and D10 connected in parallel. The second group includes four LED light-emitting chip groups arranged in series. The first group of the second group includes D3 and D11 arranged in parallel. The second group includes D4 and D12 arranged in parallel. The third group includes D5 and D13 arranged in parallel. The fourth group includes D6 and D14 arranged in parallel. The third group includes two LED light-emitting chip groups connected in series. The first group of the third group includes LED light-emitting chips D7 and D15 connected in parallel. The second group of the third group includes LED chips D8 and D16 connected in parallel. A current-limiting resistor R1 is electrically connected between the first and second groups, and a current-limiting resistor R2 is electrically connected between the second and third groups. The current-limiting resistors R1 and R2 are located between the first and second groups and between the second and third groups, respectively, and are used to divide the voltage and limit the current of each group to avoid chip overload. Each parallel group, such as LED chip D1 and LED chip D9, has the same voltage and current is divided, which is suitable for using LED chips of the same specification to ensure consistent brightness. Series grouping: The total voltage of the series group is the sum of the voltages of each parallel group. It is necessary to ensure that the input voltage +24V is sufficient to cover the voltage drop of all series groups and to increase current sharing measures. A current-limiting resistor is connected in series within the parallel group to ensure uniform current distribution and improve stability. The number of series groups can be adjusted according to the actual forward voltage Vf. For example, the second group can be changed to 3 or 5 parallel groups to adapt to different chip parameters and improve the flexibility of grouping.
[0022] Furthermore, such as Figure 2 As shown, LED chips D1-D16 are all monochromatic chips with a wavelength range of 500-700nm and a luminous efficacy ≥120lm / W. Monochromatic chips emit light of a single wavelength, without color mixing interference, making them suitable for scenarios requiring precise spectral control. They eliminate the need for complex color mixing circuits, reducing system design complexity and cost. Monochromatic chips have a simple structure, fewer failure points, and a longer lifespan. The current-limiting resistors R1 and R2 are pre-soldered on the flexible printed FPCB substrate 1, eliminating the need for subsequent manual soldering, reducing assembly complexity, avoiding defects such as cold solder joints and short circuits caused by manual soldering, and improving product consistency.
[0023] Furthermore, such as Figure 2As shown, the circuit layer pad 3 uses a copper-clad laminate with a copper foil thickness of ≥35μm. When the copper foil thickness is ≥35μm, the cross-sectional area is nearly doubled compared to the conventional 18μm copper foil, allowing a larger current to pass through without significant temperature rise. The increased copper foil thickness reduces the pad resistance, reduces power loss, and improves circuit efficiency. The LED chip assembly 2 is provided with an encapsulation layer, which is made of phosphor and epoxy resin in a volume ratio of 1:3, and covers the LED chip to emit light uniformly.
[0024] like Figures 1-2 As shown in the figure, the principle of the novel single-color COB flexible light strip with no beginning and end brightness difference provided in this embodiment is as follows: Since the appropriate resistor needs to be matched to each meter of LED strip according to the actual voltage to achieve the target power, in order to prevent LED strips of different power from being mixed together during the production process, the flexible printed FPCB substrate 1 is designed to be made into rolls of 5 meters or 10 meters according to the actual customer needs. The number 1 is marked on the FPCB substrate of the first meter of LED strip, and so on, so as to distinguish the power and LED strip and ensure the process is error-free, thus ensuring the feasibility of production from the design. LED light-emitting chip group 2 is fixed on circuit layer pad 3 of flexible printed FPCB substrate 1. LED strip circuit 4, LED light-emitting chip group 2 is matrix arranged on LED strip circuit 4. The matrix arrangement of LED light-emitting chip group 2 can reduce the shadow effect between chips and improve the luminous efficiency by 10%-15% compared with the traditional random arrangement. When a single chip fails, only the corresponding matrix unit needs to be replaced, reducing maintenance costs. The light strip circuit 4 includes a current-limiting resistor component 5, which includes current-limiting resistors R1 and R2 arranged meter by meter along the length of the light strip. The resistance value of each current-limiting resistor is matched with the actual working voltage of the corresponding meter segment to compensate for the brightness difference caused by the voltage drop in the circuit. It is normal for there to be a voltage drop in the light strip circuit 4, but this phenomenon will cause a significant difference in brightness between the beginning and the end, which will seriously affect the actual user experience of the customer. In the light strip design, in order to overcome the resistance of the resistor to the flow of electrons, energy must be consumed. This consumed energy will be dissipated in the form of heat, etc. The actual operating voltage for the corresponding meter segment is measured using a multimeter, and the resistance value is calculated based on Ohm's law. The formula is as follows: R= ; Where U is the voltage value; I is the current value; R is the resistance value of the current-limiting resistor. This means that a voltage drop occurs across this resistor. The greater the current or the greater the resistance, the more energy is required, and therefore the greater the voltage drop. The current-limiting resistors R1 and R2 limit the current, thereby achieving the target power, reducing the brightness difference between the beginning and end of the LED strip circuit 4, and meeting the requirement of non-inductive difference.
[0025] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.
[0026] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.
[0027] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.
Claims
1. A novel single-color COB flexible light strip with no beginning and end brightness difference, characterized in that, include: Flexible printed FPCB substrate (1) is produced in rolls according to a preset length, and the first meter of each roll of flexible printed FPCB substrate (1) is marked with a unique serial number. LED light-emitting chip group (2) is fixed on the circuit layer pad (3) of the flexible printed FPCB substrate (1); The LED strip circuit (4) is arranged in a matrix on the LED light-emitting chip group (2). The LED strip circuit (4) includes a current-limiting resistor component (5). The current-limiting resistor component (5) includes a current-limiting resistor R1 and a current-limiting resistor R2 arranged meter by meter along the length of the LED strip.
2. The novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: One end of the LED strip circuit (4) is connected to a +24V voltage, and the other end is grounded. The LED light-emitting chip group (2) includes LED light-emitting chips D1-D16 and is divided into three groups, specifically: The first group includes two LED light-emitting chip groups connected in series. The first group group one includes LED light-emitting chips D1 and D9 connected in parallel. The first group group two includes LEDs D2 and D10 connected in parallel. The second group includes four LED light-emitting chip groups arranged in series. The first group of the second group includes D3 and D11 arranged in parallel. The second group includes D4 and D12 arranged in parallel. The third group includes D5 and D13 arranged in parallel. The fourth group includes D6 and D14 arranged in parallel. The third group includes two LED light-emitting chip groups connected in series. The first group of the third group includes LED light-emitting chips D7 and D15 connected in parallel. The second group of the third group includes LED chips D8 and D16 connected in parallel. A current-limiting resistor R1 is electrically connected between the first group and the second group, and a current-limiting resistor R2 is electrically connected between the second group and the third group.
3. The novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: The LED chips D1-D16 are all monochrome chips with a wavelength range of 500-700nm and a luminous efficacy ≥120lm / W.
4. The novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: The flexible printed FPCB substrate (1) is made by welding 0.5-meter panels together, and each roll is 5 meters or 10 meters long. The first meter of the flexible printed FPCB substrate (1) is marked with the number "1" on the silk screen, and the subsequent meters are incremented sequentially.
5. A novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: The actual operating voltage of the LED chip group (2) is measured using a multimeter, and the resistance value is calculated based on Ohm's law. The formula is as follows: R= ； Where U is the voltage value; I is the current value; R is the resistance value of the current-limiting resistor.
6. A novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: The current-limiting resistors R1 and R2 are pre-welded onto the flexible printed FPCB substrate (1).
7. A novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: The circuit layer pads (3) are made of copper-clad laminate with a copper foil thickness of ≥35μm.
8. A novel single-color COB flexible light strip with no beginning and end brightness difference according to claim 1, characterized in that: The LED light-emitting chip group (2) is provided with an encapsulation layer.