A COB light source and a COB lamp with adjustable light emitting surface state

Abstract

The utility model discloses a kind of COB light source and COB lamps and lanterns with adjustable luminous surface state, the COB light source includes substrate, driving area, soldering area and light source area are equipped on substrate, at least two light emitting modules with interval distribution are equipped in light source area, low-voltage multi-stage linear constant current driving module is equipped in driving area;Soldering area includes power supply pad, power supply pad is connected with external voltage regulating module, low-voltage multi-stage linear constant current driving module and light emitting module respectively, for providing direct-current low-voltage power supply for low-voltage multi-stage linear constant current driving module and light emitting module;Low-voltage multi-stage linear constant current driving module is connected with light emitting module, for controlling any one or more than two light emitting modules to work according to the voltage variation of input power supply, to adjust the working state of the luminous surface of light source area.Adopting the utility model can adjust the working state of the luminous surface of light source area, realize new luminous surface adjusting function, and the number of pad and wiring is less, assembly wiring efficiency is high, while overall structure is simple and low in cost.

Description

Technical Field

[0001] This utility model relates to the field of COB technology, and in particular to a COB light source and COB lamp with adjustable light-emitting surface state. Background Technology

[0002] Current COB lights generally include multiple LED light groups and multiple pads. The multiple pads are connected to the driver pads on the driver board. By controlling the switching components to turn different pads on and off, the corresponding LED light groups can be controlled or changed to achieve the function of changing the size of the luminous surface. Alternatively, some track lights have a built-in switch driver circuit, a wireless communication module, and a processor. The processor connects to a mobile terminal through the wireless communication module to receive control signals from the mobile terminal and control the switch driver circuit to turn on the corresponding LED light groups to achieve the function of changing the size of the luminous surface.

[0003] However, the manual control method described above requires multiple pads on the light source board to correspond to the LED groups and two power supply pads when using multi-channel LED light groups. This results in a large number of pads and wires, making wiring cumbersome and hindering the assembly and wiring of the COD light source, leading to low installation efficiency. The wireless control method, on the other hand, requires more components, resulting in a more complex structure and higher cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a COB light source and COB lamp with adjustable light-emitting surface state, which can adjust the working state of the light-emitting surface of the light source area according to the voltage change of the external input DC low voltage power supply, realize the light-emitting surface adjustment function, and have fewer solder pads and wiring, high assembly and wiring efficiency, and simple overall structure and low cost.

[0005] To address the aforementioned technical problems, this utility model provides a COB light source with an adjustable luminous surface state, comprising a substrate. The substrate has a driving area, a soldering area, and a light source area. The light source area has at least two luminous modules spaced apart. The driving area has a low-voltage multi-stage linear constant current driving module. The soldering area includes power pads, which are connected to an external voltage regulating module, the low-voltage multi-stage linear constant current driving module, and the luminous modules, respectively, to provide a low-voltage DC power supply to the low-voltage multi-stage linear constant current driving module and the luminous modules. The low-voltage multi-stage linear constant current driving module is connected to the luminous modules and is used to control the operation of any one or more luminous modules according to the voltage change of the input low-voltage DC power supply, thereby adjusting the working state of the luminous surface of the light source area.

[0006] As an improvement to the above solution, the multiple light-emitting modules are connected in series. The low-voltage multi-stage linear constant current drive module is provided with multiple constant current switch drive terminals. The constant current switch drive terminals are connected to the light-emitting modules one by one, and are used to control one or more light-emitting modules to work according to the voltage change of the input DC low-voltage power supply, so as to adjust the size of the light-emitting surface of the light source area.

[0007] As an improvement to the above solution, the multiple light-emitting modules are connected in parallel. The low-voltage multi-stage linear constant current drive module is provided with multiple constant current switch drive terminals. The constant current switch drive terminals are connected to the light-emitting modules one by one, and are used to control the operation of any light-emitting module according to the voltage change of the input DC low-voltage power supply, so as to adjust the color of the light-emitting surface of the light source area.

[0008] As an improvement to the above solution, the multi-channel light-emitting modules include a first light-emitting module, a second light-emitting module, and a third light-emitting module connected in series in sequence; the low-voltage multi-stage linear constant current driving module includes a power supply pin, a first constant current switch driving pin, a second constant current switch driving pin, a third constant current switch driving pin, a sampling pin, and a ground pin; the positive terminal of the DC low-voltage power supply is connected to a terminal of the first light-emitting module and the power supply pin respectively; the first constant current switch driving pin is connected to the connection terminal between the first light-emitting module and the second light-emitting module, the second constant current switch driving pin is connected to the connection terminal between the second light-emitting module and the third light-emitting module, and the third constant current switch driving pin is connected to a terminal of the third light-emitting module; the sampling pin is connected to the negative terminal of the DC low-voltage power supply via the sampling module, and the ground pin is connected to the negative terminal of the DC low-voltage power supply.

[0009] As an improvement to the above solution, the multiple light-emitting modules include a first light-emitting module, a second light-emitting module, and a third light-emitting module connected in parallel in sequence; the low-voltage multi-stage linear constant current driving module includes a power supply pin, a first constant current switch driving pin, a second constant current switch driving pin, a third constant current switch driving pin, a sampling pin, and a ground pin; the positive terminal of the DC low-voltage power supply is connected to one terminal of the first light-emitting module, one terminal of the second light-emitting module, one terminal of the third light-emitting module, and the power supply pin, respectively; the first constant current switch driving pin is connected to the other terminal of the first light-emitting module, the second constant current switch driving pin is connected to the other terminal of the second light-emitting module, and the third constant current switch driving pin is connected to the other terminal of the third light-emitting module; the sampling pin is connected to the negative terminal of the DC low-voltage power supply via the sampling module, and the ground pin is connected to the negative terminal of the DC low-voltage power supply.

[0010] As an improvement to the above solution, the multiple light-emitting modules are arranged in concentric circles at intervals, and each light-emitting module includes at least two LEDs.

[0011] As an improvement to the above solution, the power supply pin is connected to the positive terminal of the DC low-voltage power supply via a reverse connection protection diode.

[0012] As an improvement to the above scheme, the sampling module includes at least one sampling resistor.

[0013] This utility model also discloses a COB lamp, including a lamp body and the aforementioned COB light source with an adjustable light-emitting surface state, wherein the COB light source with an adjustable light-emitting surface state is disposed in the lamp body.

[0014] The beneficial effects of implementing this utility model are as follows:

[0015] This invention can control the operation of any one or more light-emitting modules according to the voltage change of the externally input DC low-voltage power supply, thereby adjusting the working state of the light-emitting surface of the light source area, such as adjusting the size or color of the light-emitting surface, realizing a new light-emitting surface adjustment function to meet the user's adjustment needs. Moreover, it has fewer solder pads and wiring, high assembly and wiring efficiency, and a simple overall structure and low cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the first embodiment of the COB light source with adjustable light-emitting surface state of this utility model;

[0017] Figure 2 This is a circuit diagram of the first embodiment of the COB light source of this utility model;

[0018] Figure 3 This is a circuit diagram of the second embodiment of the COB light source of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, Figure 1This diagram illustrates the structure of a first embodiment of a COB light source with adjustable light-emitting surface state according to the present invention. It includes a substrate 1, on which a driving region 2, a soldering region 3, and a light source region 4 are provided. The light source region 4 contains at least two spaced-apart light-emitting modules 5. The driving region 2 contains a low-voltage multi-stage linear constant current driving module 21. The soldering region 3 includes power pads 31, which are connected to an external voltage regulating module, the low-voltage multi-stage linear constant current driving module 21, and the light-emitting modules 5, respectively, to provide a low-voltage DC power supply to the low-voltage multi-stage linear constant current driving module 21 and the light-emitting modules 5. The external voltage regulating module can adjust its output voltage to provide different supply voltages to the low-voltage multi-stage linear constant current driving module 21.

[0021] The low-voltage multi-stage linear constant current drive module 21 is connected to the light-emitting module 5. When the voltage of the input low-voltage DC power supply changes, the low-voltage multi-stage linear constant current drive module 21 selects the corresponding drive connection terminal to conduct according to the actual value after the voltage change, thereby controlling the operation of any one or more of the light-emitting modules 5 to adjust the working state of the light-emitting surface of the light source area 4, such as adjusting the size or color of the light-emitting surface, realizing the light-emitting surface adjustment function, meeting the user's adjustment needs, and only two solder pads for the positive and negative terminals of the power supply are required. The number of solder pads and wiring is small, the assembly and wiring efficiency is high, and the overall structure is simple and low in cost.

[0022] Specifically, the multiple light-emitting modules 5 are connected in series. The low-voltage multi-stage linear constant current drive module 21 is provided with multiple constant current switch drive terminals, which are connected one-to-one with each of the light-emitting modules 5 to drive the corresponding light-emitting structures in the series circuit. As the voltage of the input low-voltage DC power supply changes, one, two, or more light-emitting modules 5 in the series circuit can be controlled to work sequentially, thereby driving some or all of the light-emitting structures in the series circuit to work, and thus adjusting the size of the light-emitting surface of the light source area 4.

[0023] The COB light source of this invention can be adapted to low-voltage power supply adjustment scenarios. The external voltage regulation module can be a constant voltage power supply module with a low output voltage range. By providing a low voltage range, the low-voltage multi-stage linear constant current drive module 21 can work and control the corresponding light-emitting module 5 to work according to different low voltage range values, thereby adjusting the working state of the light-emitting surface of the light source area 4 and reducing power supply costs.

[0024] Furthermore, such as Figure 2 As shown, Figure 2 The circuit diagram of the first embodiment of the COB light source of this utility model is shown. The circuit structures of the light-emitting module 5 and the low-voltage multi-stage linear constant current drive module 21 are described in detail below with reference to this embodiment:

[0025] I. Light-emitting module 5

[0026] The multiple light-emitting modules 5 include a first light-emitting module 51, a second light-emitting module 52, and a third light-emitting module 53 connected in series. One terminal of the first light-emitting module 51 is connected to the positive terminal V+ of the DC low-voltage power supply. The connection terminals between the first light-emitting module 51 and the second light-emitting module 52, the connection terminals between the second light-emitting module 52 and the third light-emitting module 53, and one terminal of the third light-emitting module 53 are respectively connected to the corresponding drive connection terminals of the low-voltage multi-stage linear constant current drive module 21.

[0027] II. Low-voltage multi-stage linear constant current drive module 21

[0028] The low-voltage multi-stage linear constant current drive module 21 includes a power supply pin D1, a first constant current switch drive pin D2, a second constant current switch drive pin D3, a third constant current switch drive pin D4, a sampling pin CS, and a ground pin GND.

[0029] The positive terminal V+ of the DC low-voltage power supply is connected to the power supply pin D1 to power the low-voltage multi-stage linear constant current drive module 21, enabling the low-voltage multi-stage linear constant current drive module 21 to operate. The sampling pin CS is connected to the negative terminal of the DC low-voltage power supply via the sampling module 6, and the grounding pin GND is connected to the negative terminal of the DC low-voltage power supply.

[0030] The first constant current switch drive pin D2 is connected to the connection terminal between the first light-emitting module 51 and the second light-emitting module 52. The second constant current switch drive pin D3 is connected to the connection terminal between the second light-emitting module 52 and the third light-emitting module 53. The third constant current switch drive pin D4 is connected to one terminal of the third light-emitting module 53, so as to drive part of the light-emitting structure or all of the light-emitting structure to work respectively, thereby adjusting the size of the light-emitting surface of the light source area 4.

[0031] It should be noted that when the voltage of the DC low-voltage power supply is adjusted by the external voltage regulation module, if the voltage of the DC low-voltage power supply reaches the chip operating voltage of the low-voltage multi-stage linear constant current drive module 21, the low-voltage multi-stage linear constant current drive module 21 starts to work; when the input voltage reaches the first preset voltage, the low-voltage multi-stage linear constant current drive module 21 controls the first constant current switch drive pin D2 to conduct, while the others are turned off. At this time, the power supply circuit of the first light-emitting module 51 is turned on, and the first light-emitting module 51 displays the operation; when the input voltage reaches the second preset voltage, the low-voltage multi-stage linear constant current drive module 21 controls the second constant current switch drive pin D3 to conduct, while the others are turned off. At this time, the first light-emitting module 51 displays the operation. When the power supply circuit of the first light-emitting module 51 and the second light-emitting module 52 is turned on, the first light-emitting module 51 and the second light-emitting module 52 are working, and the light-emitting surface of the light source area 4 increases; when the input voltage reaches the third preset voltage, the low-voltage multi-stage linear constant current drive module 21 controls the third constant current switch drive pin D4 to turn on, and the rest are turned off. At this time, the power supply circuit of the first light-emitting module 51, the second light-emitting module 52 and the third light-emitting module 53 are turned on, the first light-emitting module 51, the second light-emitting module 52 and the third light-emitting module 53 are working, and the light-emitting surface of the light source area 4 is further increased. Thus, the size of the light-emitting surface of the light source area 4 can be adjusted by changing the input voltage. The operation is simple, and the overall structure is simple and low in cost.

[0032] Furthermore, the first light-emitting module 51, the second light-emitting module 52, and the third light-emitting module 53 are arranged in concentric circles at intervals and are arranged sequentially from the inside to the outside, that is, the first light-emitting module 51 is located in the middle and the third light-emitting module 53 is located on the outermost side. When the input voltage is low, such as 12V, the low-voltage multi-stage linear constant current drive module 21 controls the first constant current switch drive pin D2 to conduct, while the second and third constant current switch drive pins D4 are closed. The power supply circuit of the first light-emitting module 51 is connected, and current flows from the positive terminal V+ of the DC low-voltage power supply through the first light-emitting module 51 to the first constant current switch drive pin D2. At this time, the first light-emitting module 51 operates, and the light-emitting surface in the central region of the light source area 4 emits light. When the input voltage increases to 24V, the low-voltage multi-stage linear constant current drive module 21 controls the second constant current switch drive pin D3 to conduct, while the first and third constant current drive pins are closed. The power supply circuit of the first light-emitting module 51 and the second light-emitting module 52 is connected, and current flows from the positive terminal V+ of the DC low-voltage power supply through the first light-emitting module 51 and the second light-emitting module 52 to the second constant current switch drive pin D2. When the input voltage increases to 36V, the low-voltage multi-stage linear constant current drive module 21 controls the third constant current switch drive pin D4 to conduct, and the first and second constant current switch drive pins D3 are turned off. The power supply circuit of the first light-emitting module 51, the second light-emitting module 52 and the third light-emitting module 53 are connected. The current flows from the positive terminal V+ of the DC low-voltage power supply through the first light-emitting module 51, the second light-emitting module 52 and the third light-emitting module 53 to the third constant current switch drive pin D4. At this time, the first light-emitting module 51, the second light-emitting module 52 and the third light-emitting module 53 are working, and the area of ​​the light-emitting surface of the light-emitting area 4 is further increased, realizing the adjustment of the size of the light-emitting surface of the light-emitting area 4 and meeting the user's actual adjustment needs.

[0033] Preferably, the power supply pin D1 is connected to the positive terminal V+ of the DC low-voltage power supply via a reverse connection protection diode to provide reverse connection protection, protect the safety of the low-voltage multi-stage linear constant current drive module 21, and thus improve the safety of the device.

[0034] Preferably, the sampling module 6 includes at least one sampling resistor. By adjusting the resistance value of the sampling module 6, the magnitude of the constant current of the low-voltage multi-stage linear constant current drive module 21 can be adjusted, which provides high flexibility.

[0035] Preferably, each of the light-emitting modules 5 includes at least two LEDs.

[0036] like Figure 3 As shown, Figure 3 The circuit diagram of a second embodiment of the COB light source of this utility model is shown. This embodiment is similar to... Figure 2Unlike the first embodiment shown, the multiple light-emitting modules 5 are connected in parallel. The low-voltage multi-stage linear constant current drive module 21 is provided with multiple constant current switch drive terminals, which are connected one-to-one with each of the light-emitting modules 5. These terminals are used to control the operation of any one of the light-emitting modules 5 according to the voltage change of the input low-voltage DC power supply, thereby adjusting the color of the light-emitting surface of the light source area 4. The circuit structures of the light-emitting module 5 and the low-voltage multi-stage linear constant current drive module 21 are described in detail below with reference to this embodiment:

[0037] I. Light-emitting module 5

[0038] The multiple light-emitting modules 5 include a first light-emitting module 51, a second light-emitting module 52, and a third light-emitting module 53 connected in parallel in sequence. One terminal of the first light-emitting module 51, one terminal of the second light-emitting module 52, and one terminal of the third light-emitting module 53 are respectively connected to the positive terminal V+ of the DC low-voltage power supply. The other terminal of the first light-emitting module 51, the other terminal of the second light-emitting module 52, and the other terminal of the third light-emitting module 53 are respectively connected to the corresponding drive connection terminal of the low-voltage multi-stage linear constant current drive module 21.

[0039] Among them, the first light-emitting module 51, the second light-emitting module 52 and the third light-emitting module 53 are light-emitting modules 5 with different light-emitting colors, such as the first light-emitting module 51 emitting red light, the second light-emitting module 52 emitting green light, and the third light-emitting module 53 emitting blue light.

[0040] II. Low-voltage multi-stage linear constant current drive module 21

[0041] The low-voltage multi-stage linear constant current drive module 21 includes a power supply pin D1, a first constant current switch drive pin D2, a second constant current switch drive pin D3, a third constant current switch drive pin D4, a sampling pin CS, and a ground pin GND.

[0042] The positive terminal V+ of the DC low-voltage power supply is connected to the power supply pin D1 via a reverse connection protection diode to power the low-voltage multi-stage linear constant current drive module 21 and provide it with reverse connection protection. The sampling pin CS is connected to the negative terminal of the DC low-voltage power supply via the sampling module 6, and the grounding pin GND is connected to the negative terminal of the DC low-voltage power supply.

[0043] The first constant current switch drive pin D2 is connected to the other terminal of the first light-emitting module 51, the second constant current switch drive pin D3 is connected to the other terminal of the second light-emitting module 52, and the third constant current switch drive pin D4 is connected to the other terminal of the third light-emitting module 53, so as to drive any light-emitting module 5 to work, thereby adjusting the color of the light-emitting surface of the light source area 4.

[0044] It should be noted that when the voltage of the DC low-voltage power supply is adjusted by the external voltage regulation module, if the voltage of the DC low-voltage power supply reaches the chip operating voltage of the low-voltage multi-stage linear constant current drive module 21, the low-voltage multi-stage linear constant current drive module 21 starts to work; when the input voltage reaches the first preset voltage (e.g., 12V), the low-voltage multi-stage linear constant current drive module 21 controls the first constant current switch drive pin D2 to conduct, while the others are turned off. At this time, the power supply circuit of the first light-emitting module 51 is turned on, the first light-emitting module 51 displays that it is working, and the color of the inventive surface of the light source area 4 is red; when the input voltage reaches the second preset voltage (e.g., 24V), the low-voltage multi-stage linear constant current drive module 21 controls When the second constant current switch drive pin D3 is turned on and the others are turned off, the power supply circuit of the second light-emitting module 52 is turned on, the second light-emitting module 52 displays that it is working, and the light-emitting surface of the light source area 4 is green. When the input voltage reaches the third preset voltage (e.g., 36V), the low-voltage multi-stage linear constant current drive module 21 controls the third constant current switch drive pin D4 to be turned on and the others are turned off. When the input voltage reaches the third preset voltage (e.g., 36V), the low-voltage multi-stage linear constant current drive module 21 controls the third constant current switch drive pin D4 to be turned on, and the others are turned off. At this time, the power supply circuit of the third light-emitting module 53 is turned on, the third light-emitting module 53 displays that it is working, and the light-emitting surface of the light source area 4 is blue. Thus, the color of the light-emitting surface of the light source area 4 can be adjusted by changing the input voltage. The operation is simple, meets the actual adjustment needs of users, and the overall structure is simple and low in cost.

[0045] This utility model also discloses a COB lamp, including a lamp body and the aforementioned COB light source with an adjustable light-emitting surface, wherein the adjustable light-emitting surface is disposed in the lamp body. Since the aforementioned COB light source with an adjustable light-emitting surface has the aforementioned technical effects, the COB lamp including the aforementioned COB light source with an adjustable light-emitting surface should also have the aforementioned technical effects, and will not be elaborated further here.

[0046] In summary, this utility model can control the operation of any one or more light-emitting modules according to the voltage change of the externally input DC low-voltage power supply, thereby adjusting the working state of the light-emitting surface of the light source area, such as adjusting the size or color of the light-emitting surface, realizing a new light-emitting surface adjustment function, meeting the user's adjustment needs, and with fewer solder pads and wiring, high assembly and wiring efficiency, as well as a simple overall structure and low cost.

[0047] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A COB light source with adjustable luminous surface state, characterized in that, The system includes a substrate, on which a driving area, a welding area, and a light source area are provided. The light source area is provided with at least two light-emitting modules spaced apart, and the driving area is provided with a low-voltage multi-stage linear constant current driving module. The welding area includes a power pad, which is connected to an external voltage regulation module, a low-voltage multi-stage linear constant current drive module and a light-emitting module, respectively, and is used to provide DC low-voltage power to the low-voltage multi-stage linear constant current drive module and the light-emitting module. The low-voltage multi-stage linear constant current drive module is connected to the light-emitting module and is used to control the operation of any one or more of the light-emitting modules according to the voltage change of the input DC low-voltage power supply, so as to adjust the working state of the light-emitting surface of the light source area.

2. The COB light source with adjustable luminous surface state as described in claim 1, characterized in that, The multiple light-emitting modules are connected in series. The low-voltage multi-stage linear constant current drive module is provided with multiple constant current switch drive terminals. The constant current switch drive terminals are connected to the light-emitting modules one by one. They are used to control one or more light-emitting modules to work according to the voltage change of the input DC low-voltage power supply, so as to adjust the size of the light-emitting surface of the light source area.

3. The COB light source with adjustable luminous surface state as described in claim 1, characterized in that, The multiple light-emitting modules are connected in parallel. The low-voltage multi-stage linear constant current drive module is provided with multiple constant current switch drive terminals. Each constant current switch drive terminal is connected to a light-emitting module in a corresponding manner. It is used to control the operation of any light-emitting module according to the voltage change of the input DC low-voltage power supply, so as to adjust the color of the light-emitting surface of the light source area.

4. The COB light source with adjustable luminous surface state as described in claim 2, characterized in that, The multi-channel light-emitting module includes a first light-emitting module, a second light-emitting module, and a third light-emitting module connected in series in sequence; The low-voltage multi-stage linear constant current drive module includes a power supply pin, a first constant current switch drive pin, a second constant current switch drive pin, a third constant current switch drive pin, a sampling pin, and a ground pin. The positive terminal of the DC low-voltage power supply is connected to one terminal of the first light-emitting module and the power supply pin, respectively. The first constant current switch driving pin is connected to the connection terminal between the first light-emitting module and the second light-emitting module, the second constant current switch driving pin is connected to the connection terminal between the second light-emitting module and the third light-emitting module, and the third constant current switch driving pin is connected to one terminal of the third light-emitting module. The sampling pin is connected to the negative terminal of the DC low-voltage power supply via the sampling module, and the grounding pin is connected to the negative terminal of the DC low-voltage power supply.

5. The COB light source with adjustable luminous surface state as described in claim 3, characterized in that, The multi-channel light-emitting module includes a first light-emitting module, a second light-emitting module, and a third light-emitting module connected in parallel in sequence; The low-voltage multi-stage linear constant current drive module includes a power supply pin, a first constant current switch drive pin, a second constant current switch drive pin, a third constant current switch drive pin, a sampling pin, and a ground pin. The positive terminal of the DC low-voltage power supply is connected to one terminal of the first light-emitting module, one terminal of the second light-emitting module, one terminal of the third light-emitting module, and the power supply pin, respectively. The first constant current switch driving pin is connected to the other terminal of the first light-emitting module, the second constant current switch driving pin is connected to the other terminal of the second light-emitting module, and the third constant current switch driving pin is connected to the other terminal of the third light-emitting module; The sampling pin is connected to the negative terminal of the DC low-voltage power supply via the sampling module, and the grounding pin is connected to the negative terminal of the DC low-voltage power supply.

6. The COB light source with adjustable luminous surface state as described in any one of claims 1 to 5, characterized in that, The multiple light-emitting modules are arranged in concentric circles at intervals, and each light-emitting module includes at least two LEDs.

7. The COB light source with adjustable luminous surface state as described in claim 4 or 5, characterized in that, The power supply pin is connected to the positive terminal of the DC low-voltage power supply via a reverse connection protection diode.

8. The COB light source with adjustable luminous surface state as described in claim 4 or 5, characterized in that, The sampling module includes at least one sampling resistor.

9. A COB lamp, characterized in that, The invention includes a lamp body and a COB light source with an adjustable light-emitting surface state as described in any one of claims 1 to 8, wherein the COB light source with an adjustable light-emitting surface state is disposed in the lamp body.

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