Three-wire low-voltage variable-light LED lamp strip

Abstract

The utility model discloses a three-wire low-voltage variable-light LED lamp strip which comprises a circuit board, the circuit board comprises an upper circuit layer and an upper insulating layer covering the upper circuit layer, a plurality of light-emitting modules and resistors are arranged on the circuit board, and the upper circuit layer comprises a first circuit, a second circuit, a third circuit and a fourth circuit. The light-emitting module is composed of a first LED lamp bead and a second LED lamp bead which are different in color temperature, the first LED lamp bead and the second LED lamp bead are high-voltage LED lamp beads which are matched with a driving power source after being connected with a resistor in series, the first LED lamp bead is connected between the second circuit and the third circuit, the second LED lamp bead is connected between the second circuit and the fourth circuit, and the fourth circuit is connected with the third circuit. A resistor is arranged at an interval of a plurality of light-emitting modules, and the resistor is connected between the first circuit and the second circuit. The circuit has the advantages of being short in minimum shearable unit, small in resistor consumption, simple in circuit, wide in circuit board size and the like.

Description

Technical Field

[0001] This utility model relates to an LED lighting fixture, specifically disclosing a three-wire low-voltage variable light LED strip. Background Technology

[0002] refer to Figure 1 The existing low-voltage variable-brightness LED light strip includes multiple parallel-connected light-emitting modules D. Each light-emitting module D includes a pure white LED chip and a resistor connected in series to form a pure white light unit D1, and a warm white LED chip and a resistor connected in series to form a warm white light unit D2. The positive terminals of the pure white light unit D1 and the warm white light unit D2 are connected to the positive circuit V+, and their negative terminals are connected to two negative circuits V- respectively. An external controller controls the brightness ratio of the two light-emitting units D1 / D2 in the light-emitting module D through the two negative circuits, enabling the LED light strip to achieve a color temperature change from pure white to warm white light. When using the LED light strip, it needs to be cut to the actual length. To avoid damaging the circuit structure of the light-emitting modules, one light-emitting module D should be used as the smallest cutting unit. Low-voltage LED light strips typically have an input voltage of 12V or 24V, while ordinary LED beads operate at 3V. The light-emitting units D1 / D2 in the light-emitting module D require multiple LED beads connected in series, and each light-emitting unit D1 / D2 needs a series resistor to suppress voltage surges affecting the LED beads. This results in the light-emitting module D occupying a large space along the length of the circuit board, making the minimum cutting unit length of the LED light strip too long and difficult to accurately match the actual usage dimensions. Furthermore, because it requires five circuits to be arranged along the width of the circuit board, the circuitry is complex, and the circuit board width is relatively large. Utility Model Content

[0003] Therefore, it is necessary to address the existing technical problems by providing a three-wire low-voltage variable light LED strip with a short minimum cutting unit, simple circuit, and small circuit board width.

[0004] To address the problems of existing technologies, this utility model discloses a three-wire low-voltage variable light LED strip, comprising a circuit board. The circuit board includes an upper circuit layer and an upper insulating layer covering the upper circuit layer. Multiple light-emitting modules and resistors are disposed on the circuit board. The upper circuit layer includes a first circuit, a second circuit, a third circuit, and a fourth circuit. Each light-emitting module consists of two LED beads with different color temperatures: a first LED bead and a second LED bead. The first and second LED beads are high-voltage LED beads matched to the driving power supply after being connected in series with a resistor. The first LED bead is connected between the second and third circuits, and the second LED bead is connected between the second and fourth circuits. A resistor is disposed every few light-emitting modules, and the resistor is connected between the first and second circuits.

[0005] The beneficial effects of this utility model are as follows: Since this utility model uses high-voltage LED beads, the light-emitting module contains only two LED beads with different color temperatures. The length of the light-emitting module is relatively short. Furthermore, since the light-emitting module and the resistor are connected in series and parallel, multiple light-emitting modules share multiple resistors. There is no need to configure a resistor for each light-emitting module. The amount of resistors used is small, the power consumption is low, the length of the light-emitting module is short, the circuit is simple, the control lines are few, and the width of the circuit board is small.

[0006] This utility model can be further improved as follows: In the second circuit, a break is provided at intervals of several light-emitting modules. At least one resistor is provided at each end of the light strip, and one resistor is provided in the middle of the light strip at intervals of two light-emitting modules. The driving voltage of the LED light strip is 12V, 24V, or 36V, and the operating voltage of the LED beads is 9V, 18V, or 33V respectively. A lower circuit layer is also provided on the back of the upper circuit layer, and a middle insulating layer is provided between the upper and lower circuit layers. The lower circuit layer includes a first additional circuit, a second additional circuit, and a third additional circuit. The first, second, and third additional circuits are electrically connected to the first, third, and fourth circuits respectively through conductors penetrating the middle insulating layer. On the upper insulating layer, a wiring pad is provided above each of the first, third, and fourth circuits in each or several light-emitting module intervals. The position of the wiring pad corresponds to the first, second, and third additional circuits, and the conductor is located in the pad area. Attached Figure Description

[0007] Figure 1 This is a circuit schematic diagram of existing technology.

[0008] Figure 2 This is a front structural view of the LED light strip of this utility model.

[0009] Figure 3 for Figure 2 A schematic diagram of the structure of section AA.

[0010] Figure 4 This is a schematic diagram of the upper circuit layer of this utility model.

[0011] Figure 5 This is a schematic diagram of the lower circuit layer of this utility model.

[0012] Figure 6 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0013] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0014] refer to Figure 2 A three-wire low-voltage variable-brightness LED light strip includes a circuit board 1 and first LED beads 2a and second LED beads 2b with different color temperatures soldered onto the circuit board 1, along with resistors 3. The first LED bead 2a is a cool white LED bead, and the second LED bead 2b is a warm white LED bead. A first LED bead 2a and a second LED bead 2b are arranged close together to form a light-emitting module 2. A resistor 3 is placed next to each of the light-emitting modules 2 at both ends of the light strip, and a resistor 3 is placed every other light-emitting module 2 along the middle of the LED light strip.

[0015] refer to Figure 2 and Figure 3 The circuit board 1 includes a lower insulating layer 11, a lower circuit layer 12, a middle insulating layer 13, an upper circuit layer 14, and an upper insulating layer 15 stacked sequentially. (See reference) Figure 4 and Figure 6 The upper circuit layer 14 is provided with a first circuit 14a, a second circuit 14b, a third circuit 14c, and a fourth circuit 14d extending along the length of the circuit board 1. The first circuit 14a and the fourth circuit 14d are located on opposite sides of the circuit board, and the second circuit 14b and the third circuit 14c are located between the first circuit 14a and the fourth circuit 14d. The upper insulating layer 15 has wiring pads 151 above the first circuit 14a, the third circuit 14c, and the fourth circuit 14d; resistor pads 152 above the first circuit 14a and the second circuit 14b; and LED pads 153 above the second circuit 14b, the third circuit 14c, and the fourth circuit 14d. The wiring pads 151 are used for soldering leads to connect to an external controller and a drive power supply. The first LED 2a and the second LED 2b are soldered into the LED pads 153, and the resistor 3 is soldered into the resistor pads 152. (Reference) Figures 3 to 6 The lower circuit layer 12 includes a first additional circuit 12a, a second additional circuit 12c, and a third additional circuit 12d. These three additional circuits correspond to wiring pads 151 located above the first circuit 14a, the third circuit 14c, and the fourth circuit 14d, respectively. Each wiring pad 151 contains a conductor 16 that penetrates the middle insulating layer 13. This conductor 16 electrically connects the first additional circuit 12a, the second additional circuit 12c, and the third additional circuit 12d to the first circuit 14a, the third circuit 14c, and the fourth circuit 14d, respectively. The conductor 16's placement within the wiring pad 151 area facilitates manufacturing. The additional circuits also increase the circuit cross-section, reduce circuit resistance, decrease circuit voltage drop, simplify the upper circuit 14, and reduce the width of the circuit board.

[0016] refer to Figures 3 to 6The first LED bead 2a and the second LED bead 2b are high-voltage LED beads. That is, each LED bead contains multiple LED chips connected in series, each with a working voltage of 3V. Depending on the number of LED chips connected in series, the working voltage of the LED bead can range from 9V to 33V. When powered by a 12V external power supply, the LED bead contains three LED chips, and the working voltage is 9V; when powered by a 24V external power supply, the LED bead contains six LED chips, and the working voltage is 18V; when powered by a 36V external power supply, the LED bead can contain nine to eleven LED chips, and the working voltage is 27V to 33V. The first LED bead 2a in the light-emitting module 2 is connected between the second circuit 14b and the third circuit 14c, and the second LED bead 2b is connected between the second circuit 14b and the fourth circuit 14d. The resistor 3 is connected between the first circuit 14a and the second circuit 14b. First, connect all resistors 3 in parallel, then connect all LEDs in parallel, and finally connect resistors 3 and the LEDs in series. (Refer to...) Figure 6 Each of the first circuit 14a, third circuit 14c, and fourth circuit 14d in each light-emitting module 2 interval has a wiring pad 151. Thus, this invention can be used by cutting from the center line of the wiring pad 151 at any light-emitting module 2 interval, and then soldering leads to the wiring pad 151 to connect to an external driving power supply, achieving what is known in the industry as arbitrary light-emitting module cutting. As an improvement, at least two resistors 3 are respectively arranged at both ends of the LED strip, so that regardless of which end of the strip is cut from or the length of the cut, at least one resistor 3 is included, making cutting more convenient. To avoid the entire strip failing to light up due to a short circuit of a single LED, which would hinder use or troubleshooting, a break 140 is provided on the second circuit 14b every six to eighteen light-emitting film groups 2. This way, even if a single LED short-circuits, only that part of the light-emitting module 2 will not light up, allowing for quick troubleshooting and repair.

[0017] refer to Figure 6 In a more specific embodiment of this utility model, the first circuit 14a is a positive circuit, and the third circuit 14c and the fourth circuit 14d are negative circuits. Thus, the external controller controls the first LED bead 2a and the second LED bead 2b in the light-emitting module 2 through the negative circuits, namely the third circuit 14c and the fourth circuit 14d. Alternatively, the first circuit 14a can be set as a negative circuit, and the third circuit 14c and the fourth circuit 14d as positive circuits. In this case, the external controller controls the first LED bead 2a and the second LED bead 2b through two positive circuits.

[0018] Because this invention uses high-voltage LED beads, the light-emitting module contains only two LED beads of different color temperatures. The light-emitting module is relatively short. Furthermore, since the light-emitting module and the resistor are connected in a mixed series and parallel configuration, multiple light-emitting modules share multiple resistors. There is no need to configure a resistor for each light-emitting module. This results in fewer resistors, lower power consumption, a simpler circuit, fewer control lines, a smaller circuit board width, and a shorter cutting unit. The cutting length is easier to accurately match actual needs. Even if a very short section of the light-emitting module without resistors is cut in the middle, it can still be used after being connected with other light-emitting modules that contain resistors.

[0019] The above-described embodiments 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 three-wire low-voltage variable-beam LED light strip, comprising a circuit board, the circuit board including an upper circuit layer and an upper insulating layer covering the upper circuit layer, wherein the circuit board is provided with a plurality of light-emitting modules and resistors, characterized in that: The upper circuit layer includes a first circuit, a second circuit, a third circuit, and a fourth circuit. The light-emitting module consists of two LED beads with different color temperatures: a first LED bead and a second LED bead. The first and second LED beads are high-voltage LED beads matched with the driving power supply after being connected in series with a resistor. The first LED bead is connected between the second and third circuits, and the second LED bead is connected between the second and fourth circuits. A resistor is set every few light-emitting modules, and the resistor is connected between the first and second circuits.

2. The three-wire low-voltage variable light LED strip according to claim 1, characterized in that: In the second circuit, a break point is set every few light-emitting modules.

3. The three-wire low-voltage variable light LED light strip of claim 1, wherein: At least one resistor is provided at each end of the light strip, and one resistor is provided every two light-emitting modules in the middle of the light strip.

4. The three-wire low-voltage variable light LED light strip of claim 1, wherein: The LED light strip is driven by 12V, 24V, or 36V, and the LED beads are operated by 9V, 18V, or 33V respectively.

5. The three-wire low-voltage variable light LED light strip of claim 1, wherein: A lower circuit layer is also provided on the back side of the upper circuit layer, and a middle insulating layer is provided between the upper circuit layer and the lower circuit layer. The lower circuit layer includes a first additional circuit, a second additional circuit and a third additional circuit. The first additional circuit, the second additional circuit and the third additional circuit are electrically connected to the first circuit, the third circuit and the fourth circuit respectively through conductors that penetrate the middle insulating layer.

6. A three-wire low-voltage variable light LED light strip according to claim 5, characterized in that: On the upper insulating layer, a wiring pad is provided above the first circuit, the third circuit, and the fourth circuit in each light-emitting module interval.

7. A three-wire low-voltage variable light LED strip according to claim 6, characterized in that: The wiring pads are located in the same positions as the first, second, and third additional circuits, and the conductors are disposed in the pad areas.

Images