A positive and negative connection non-polar single color COB light source

Abstract

The utility model relates to COB light source technical field, specifically disclose a kind of positive and negative connection electrodeless monochromatic COB light source, including substrate, positive electrode power pad, negative electrode power pad, light emitting chip group, first unidirectional diode, second unidirectional diode, third unidirectional diode, fourth unidirectional diode, first current-limiting transistor and second current-limiting transistor are arranged on the substrate, the light emitting chip group is respectively with first unidirectional diode, second unidirectional diode, first current-limiting transistor and second current-limiting transistor electric connection, the first current-limiting transistor and second current-limiting transistor are respectively with fourth unidirectional diode and third unidirectional diode electric connection, the positive electrode power pad is respectively with first unidirectional diode and fourth unidirectional diode electric connection, the negative electrode power pad is respectively with second unidirectional diode and fourth unidirectional diode electric connection.The utility model can carry out power-on light emitting under the condition of positive connection or reverse connection power supply, and high safety, and use effect is good.

Description

Technical Field

[0001] This utility model relates to the field of COB light source technology, and in particular to a polarless monochromatic COB light source that can be connected in both directions. Background Technology

[0002] COB (Chip on Board) refers to chip-on-board packaging. COB light sources typically include a substrate, on which are provided light-emitting areas, cold light positive electrode pads, cold light negative electrode pads, warm light positive electrode pads, warm light negative electrode pads, and conductive lines. COB light sources are widely used due to their long lifespan, lack of pollution, and high luminous efficiency.

[0003] A search revealed that Chinese utility model patent CN202421190680.3 discloses a constant-voltage, upright, monochrome COB (Chip-on-Board) assembly, comprising a COB substrate. The COB substrate has a light source mounting groove and several constant-voltage IC chip mounting grooves communicating with the light source mounting groove. Several light-emitting wicks are mounted on the light source mounting groove, and a constant-voltage IC chip is mounted on each of the constant-voltage IC chip mounting grooves. A light-shielding silicone layer is coated above the constant-voltage IC chip mounting groove. Several power pads are located diagonally on the COB substrate. The constant-voltage IC chip is electrically connected to both the light-emitting wicks and the power pads. This utility model mounts the constant-voltage IC chip by using mounting grooves with a light-shielding silicone layer coated above them. This eliminates the need for multiple grooves, allowing for a more efficient arrangement of the wicks and constant-voltage components, maximizing the use of COB substrate space, improving production efficiency, and enhancing the light-shielding effect of the constant-voltage IC chip. The light-shielding effect is better, resulting in higher light extraction efficiency.

[0004] While the existing COBs can meet basic usage requirements, they all use unidirectional LED chips connected in series. This means that the power supply connected in series with the LED chips must correspond to the positive and negative power pads; otherwise, the entire COB will not light up or may even be damaged. Furthermore, the constant voltage IC chip draws power from the LED chipset, which can cause some LED chips to have excessively high brightness at low voltages, resulting in poor performance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a polarized monochromatic COB light source that can be connected in both directions to avoid the above-mentioned defects of the prior art. It can emit light when powered on or when the power supply is reversed. There is no need to distinguish between the positive and negative terminals of the power supply when connecting to the power supply, which is safe. Furthermore, the current limiting transistor does not need to draw power from the light-emitting chip group, which can avoid the phenomenon that some LED light-emitting chips have excessively high brightness when the voltage is low, resulting in good performance.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] A reversible, electrodeless monochromatic COB light source includes a substrate. The substrate has a positive power pad, a negative power pad, a light-emitting chip assembly, a first unidirectional diode, a second unidirectional diode, a third unidirectional diode, a fourth unidirectional diode, a first current-limiting transistor, and a second current-limiting transistor. The light-emitting chip assembly is electrically connected to the first unidirectional diode, the second unidirectional diode, the first current-limiting transistor, and the second current-limiting transistor, respectively. The first and second current-limiting transistors are electrically connected to the fourth and third unidirectional diodes, respectively. The positive power pad is electrically connected to the first and fourth unidirectional diodes, respectively, and the negative power pad is electrically connected to the second and fourth unidirectional diodes, respectively.

[0008] Preferably, the anode of the first unidirectional diode is electrically connected to the positive power pad, the cathode of the first unidirectional diode is electrically connected to the input terminal of the light-emitting chip group, the second current-limiting transistor is electrically connected to the output terminal of the light-emitting chip group and the anode of the third unidirectional diode, and the cathode of the third unidirectional diode is electrically connected to the negative power pad.

[0009] Preferably, the anode of the second unidirectional diode is electrically connected to the negative power pad, the cathode of the second unidirectional diode is electrically connected to the input terminal of the light-emitting chip group, the first current-limiting transistor is electrically connected to the output terminal of the light-emitting chip group and the anode of the fourth unidirectional diode, and the anode of the fourth unidirectional diode is electrically connected to the positive power pad.

[0010] Preferably, a resistor is further provided on the substrate, the positive power pad is electrically connected to one end of the resistor via a first unidirectional diode, and the first current-limiting transistor is electrically connected to the other end of the resistor and a second current-limiting transistor, respectively.

[0011] Preferably, a dam is provided on the substrate, and the light-emitting chip group is located inside the dam. The first unidirectional diode, the second unidirectional diode, the third unidirectional diode, the second current-limiting transistor, the first current-limiting transistor, and the fourth unidirectional diode are arranged sequentially around the dam.

[0012] Preferably, the light-emitting chip group consists of a plurality of LED light-emitting chips connected in series, and the positive power pad and the negative power pad are symmetrically arranged on the diagonal of the substrate.

[0013] By adopting the above technical solution, the present invention provides a reversible electrodeless monochromatic COB light source with the following beneficial effects: the light-emitting chip group in the reversible electrodeless monochromatic COB light source is electrically connected to the first unidirectional diode, the second unidirectional diode, the first current-limiting transistor, and the second current-limiting transistor, respectively; the first current-limiting transistor and the second current-limiting transistor are electrically connected to the fourth unidirectional diode and the third unidirectional diode, respectively; the positive power pad is electrically connected to the first unidirectional diode and the fourth unidirectional diode, respectively; and the negative power pad is electrically connected to the second unidirectional diode and the fourth unidirectional diode, respectively. The system features an electrical connection and uses at least four unidirectional diodes to control the current input in different directions, ensuring that the current flows in the forward direction to the LED chip group. It can power on and emit light regardless of whether the power supply is connected in the forward or reverse direction. There is no need to distinguish between the positive and negative terminals of the power supply when connecting the power. The current-limiting transistor ensures that the constant voltage input is converted into a constant current output to ensure the normal operation of the LED chip group. This effectively protects the LED chip group, ensuring high safety. Furthermore, the current-limiting transistor does not need to draw power from the LED chip group, which can prevent some LED chips from having excessively high brightness at low voltages, resulting in good performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] In the figure, 1-substrate, 2-positive power pad, 3-negative power pad, 4-light-emitting chip group, 5-first unidirectional diode, 6-second unidirectional diode, 7-third unidirectional diode, 8-fourth unidirectional diode, 9-first current-limiting transistor, 10-second current-limiting transistor, 11-resistor, 12-dam. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0019] like Figure 1 As shown, the reversible electrodeless monochromatic COB light source includes a substrate 1. The substrate 1 is provided with a positive power pad 2, a negative power pad 3, a light-emitting chip group 4, a first unidirectional diode 5, a second unidirectional diode 6, a third unidirectional diode 7, a fourth unidirectional diode 8, a first current-limiting transistor 9, and a second current-limiting transistor 10. The light-emitting chip group 4 is electrically connected to the first unidirectional diode 5, the second unidirectional diode 6, the first current-limiting transistor 9, and the second current-limiting transistor 10, respectively. The first current-limiting transistor 9 and the second current-limiting transistor 10 are electrically connected to the fourth unidirectional diode 8 and the third unidirectional diode 7, respectively. The positive power pad 2 is electrically connected to the first unidirectional diode 5 and the fourth unidirectional diode 8, respectively. The negative power pad 3 is electrically connected to the second unidirectional diode 6 and the fourth unidirectional diode 8, respectively. Understandably, the substrate 1 can be an aluminum substrate or the like, and the light-emitting chip group 4 is composed of several LED light-emitting chips connected in series. The positive power pad 2 and the negative power pad 3 are symmetrically arranged on the diagonal of the substrate 1. When the unidirectional diode is working, it conducts in one direction and is cut off in the reverse direction.

[0020] Specifically, the anode of the first unidirectional diode 5 is electrically connected to the positive power pad 2, and the cathode of the first unidirectional diode 5 is electrically connected to the input terminal of the light-emitting chip group 4. The second current-limiting transistor 10 is electrically connected to the output terminal of the light-emitting chip group 4 and the anode of the third unidirectional diode 7, respectively, and the cathode of the third unidirectional diode 7 is electrically connected to the negative power pad 3. The anode of the second unidirectional diode 6 is electrically connected to the negative power pad 3, and the cathode of the second unidirectional diode 6 is electrically connected to the input terminal of the light-emitting chip group 4. The first current-limiting transistor 9 is electrically connected to the output terminal of the light-emitting chip group 4 and the anode of the fourth unidirectional diode 8, respectively, and the anode of the fourth unidirectional diode 8 is electrically connected to the positive power pad 2. This is understandable. Figure 1 The unidirectional diode shown above has an anode at the unnotched end and a cathode at the notched end. When the positive power pad 2 is connected to a positive power source and the negative power pad 3 is connected to a negative power source, current flows from the positive power pad 2, through the first unidirectional diode 5, into the light-emitting chip group 4, and finally through the second current-limiting transistor 10 and the third unidirectional diode 6 to the negative power pad 3, forming a forward current-carrying circuit. At this time, the light-emitting chip group 4 is powered on and emits light. When the negative power pad 3 is connected to a positive power source and the positive power pad 2 is connected to a negative power source, current flows from the negative power pad 3, through the second unidirectional diode 6, into the light-emitting chip group 4, and finally through the first current-limiting transistor 9 and the fourth unidirectional diode 8 to the positive power pad 2, forming a reverse current-carrying circuit. At this time, the light-emitting chip group 4 is powered on and emits light.

[0021] Specifically, a resistor 11 is also provided on the substrate 1. The positive power pad 2 is electrically connected to one end of the resistor 11 via the first unidirectional diode 5. The first current-limiting transistor 9 is electrically connected to the other end of the resistor 11 and the second current-limiting transistor 10. The resistor 11 is used to supply power to the first current-limiting transistor 9 and the second current-limiting diode 10. When the positive power pad 2 or the negative power pad 3 is energized, the current first flows through the resistor 11, and then sequentially energizes and conducts the first current-limiting transistor 9 and the second current-limiting diode 10, and then enters the light-emitting chip group 4. A dam 12 is provided on the substrate 1. The light-emitting chip group 4 is located inside the dam 12. The first unidirectional diode 5, the second unidirectional diode 6, the third unidirectional diode 7, the second current-limiting transistor 10, the first current-limiting transistor 9, and the fourth unidirectional diode 8 are arranged sequentially around the dam 12.

[0022] Understandably, this utility model has a reasonable design and unique structure. By setting at least four unidirectional diodes to control the current input in different directions, it ensures that the current flows in the forward direction to the light-emitting chip group. It can be powered on and emit light under both positive and reverse power supply conditions. When connecting to power, there is no need to distinguish between the positive and negative terminals of the power supply. The aforementioned current-limiting transistor ensures that after the constant voltage input is converted into a constant current output by the transistor, it ensures the normal operation of the light-emitting chip group 4. It can effectively protect the light-emitting chip group, has high safety, and the current-limiting transistor does not need to draw power from the light-emitting chip group 4, which can avoid the phenomenon that some LED light-emitting chips have excessively high brightness under low voltage. It has good performance.

[0023] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A reversible electrodeless monochromatic COB light source, comprising a substrate, wherein a positive power pad, a negative power pad, and a light-emitting chip assembly are disposed on the substrate, characterized in that: The substrate is further provided with a first unidirectional diode, a second unidirectional diode, a third unidirectional diode, a fourth unidirectional diode, a first current-limiting transistor, and a second current-limiting transistor. The light-emitting chip group is electrically connected to the first unidirectional diode, the second unidirectional diode, the first current-limiting transistor, and the second current-limiting transistor, respectively. The first current-limiting transistor and the second current-limiting transistor are electrically connected to the fourth unidirectional diode and the third unidirectional diode, respectively. The positive power pad is electrically connected to the first unidirectional diode and the fourth unidirectional diode, respectively. The negative power pad is electrically connected to the second unidirectional diode and the fourth unidirectional diode, respectively.

2. The reversible electrodeless monochromatic COB light source according to claim 1, characterized in that: The anode of the first unidirectional diode is electrically connected to the positive power pad, the cathode of the first unidirectional diode is electrically connected to the input terminal of the light-emitting chip group, the second current-limiting transistor is electrically connected to the output terminal of the light-emitting chip group and the anode of the third unidirectional diode, and the cathode of the third unidirectional diode is electrically connected to the negative power pad.

3. The reversible electrodeless monochromatic COB light source according to claim 1, characterized in that: The anode of the second unidirectional diode is electrically connected to the negative power pad, the cathode of the second unidirectional diode is electrically connected to the input terminal of the light-emitting chip group, the first current-limiting transistor is electrically connected to the output terminal of the light-emitting chip group and the anode of the fourth unidirectional diode, and the anode of the fourth unidirectional diode is electrically connected to the positive power pad.

4. The reversible electrodeless monochromatic COB light source according to claim 1, characterized in that: A resistor is also provided on the substrate. The positive power pad is electrically connected to one end of the resistor via a first unidirectional diode. The first current-limiting transistor is electrically connected to the other end of the resistor and a second current-limiting transistor, respectively.

5. The reversible electrodeless monochromatic COB light source according to claim 1, characterized in that: A dam is provided on the substrate, and the light-emitting chip group is located inside the dam. The first unidirectional diode, the second unidirectional diode, the third unidirectional diode, the second current-limiting transistor, the first current-limiting transistor, and the fourth unidirectional diode are arranged sequentially around the dam.

6. The reversible electrodeless monochromatic COB light source according to claim 1, characterized in that: The light-emitting chip group consists of several LED light-emitting chips connected in series, with positive and negative power pads symmetrically arranged on the diagonal of the substrate.

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