Configurable current regulating circuit, driving power supply and lamp

Abstract

The utility model discloses a configurable current regulation circuit, driving power supply and lamp, the configurable current regulation circuit, and the driving power supply applied to lamp, the driving power supply comprises a power supply circuit and a driving circuit, the output end of the power supply circuit is connected with the input end of the driving circuit, the configurable current regulation circuit comprises: a configuration interface, the connector is connected with external control equipment; the input end of the control circuit is connected with the configuration interface, and the control circuit is used for receiving a dimming signal output by external control equipment and outputting a corresponding current control signal; and the input end of each shunting circuit is connected with one output end of the control circuit, the output ends of the plurality of shunting circuits are connected with the current detection end of the driving circuit, and the plurality of shunting circuits are used for shunting the current detection signal of the driving circuit according to the current control signal. According to the utility model, the output current of the driving power supply in the lamp can be configured and adjusted, so that the brightness of the lamp can be changed.

Description

Technical Field

[0001] The utility model relates to the field of current regulation, and particularly relates to a configurable current regulation circuit, a driving power supply and a lamp. Background Art

[0002] As a lighting device, a lamp can be applied in various places, and in different places, the brightness requirements for the lamp are also different. Currently, for a lamp, usually switch gears or multiple fixed brightness gears are set, and the brightness of the lamp cannot be changed according to the actual environment. Summary of the Invention

[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide a configurable current regulation circuit, a driving power supply and a lamp, so as to realize configurable regulation of the output current of the driving power supply in the lamp, thereby changing the brightness of the lamp.

[0004] The technical solution of the utility model is as follows:

[0005] The utility model provides a configurable current regulation circuit, which is applied to the driving power supply of a lamp. The driving power supply includes a power supply circuit and a driving circuit. The output end of the power supply circuit is connected to the input end of the driving circuit. The configurable current regulation circuit includes:

[0006] A configuration interface for connecting an external control device;

[0007] A control circuit, the input end of the control circuit is connected to the configuration interface, and the control circuit is used for receiving a dimming signal output by an external control device and outputting a corresponding current control signal;

[0008] A plurality of shunt circuits, the input end of each shunt circuit is respectively connected to an output end of the control circuit, and the output ends of the plurality of shunt circuits are connected to the current detection end of the driving circuit. The plurality of shunt circuits are used for shunting the current detection signal of the driving circuit according to the current control signal.

[0009] Optionally, the control circuit includes:

[0010] A controller, the controller has a plurality of output ends, the output end of each controller is connected to the input end of a shunt circuit, the input end of the controller is connected to the configuration interface, and the controller is used for receiving a dimming signal output by an external control device and outputting a corresponding current control signal to the plurality of shunt circuits.

[0011] Optionally, the control circuit further includes:

[0012] A timer, connected to the controller, which is configured to control the timer to start timing when receiving a timing signal output by an external control device, and output a corresponding current control signal to the plurality of shunt circuits according to the dimming signal output by the external control device when receiving a timing trigger signal output by the timer.

[0013] Optionally, the shunt circuit includes a first resistor, a second resistor, a third resistor, and a first NMOS transistor. A first end of the first resistor is connected to an output end of the control circuit. A second end of the first resistor, a first end of the second resistor, and a gate of the first NMOS transistor are interconnected. A second end of the second resistor and a source of the first NMOS transistor are grounded. A drain of the first NMOS transistor is connected to a first end of the third resistor. A second end of the third resistor is connected to a current detection end of the drive circuit.

[0014] Optionally, the configuration interface includes:

[0015] A data port, configured to be connected to a data output end of an external control device. The data port is further connected to an input end of the control circuit, and the control circuit is configured to receive a dimming signal output by the external control device through the data port.

[0016] A power supply port, configured to be connected to a power supply output end of an external control device. The power supply port is further connected to a power supply end of the control circuit, and the control circuit is configured to receive a power supply voltage output by the external control device through the power supply port.

[0017] The present utility model further provides a drive power supply, including a power supply circuit, a drive circuit, and the configurable current regulation circuit as described above. An input end of the power supply circuit is configured to connect to an external power supply. An output end of the power supply circuit is connected to an input end of the drive circuit. A current setting end of the drive circuit is connected to output ends of a plurality of shunt circuits in the configurable current regulation circuit. An output end of the drive circuit is configured to connect to a light-emitting device.

[0018] Optionally, the drive circuit includes a drive chip, a transformer, a fourth resistor, a fifth resistor, and a second NMOS transistor. A first end of the fourth resistor is connected to a current setting pin of the drive chip and is connected to output ends of a plurality of shunt circuits in the configurable current regulation circuit. A second end of the fourth resistor, a first end of the fifth resistor, and a source of the second NMOS transistor are connected. A second end of the fifth resistor is grounded. A gate of the second NMOS transistor is connected to a control end of the drive chip. A drain of the second NMOS transistor is connected to an input end of the transformer.

[0019] The present utility model further provides a lighting fixture, which includes a light-emitting device and the driving power supply as described above, and an output end of a driving circuit in the driving power supply is connected to a power supply end of the light-emitting device.

[0020] Optionally, the lighting fixture further includes:

[0021] a housing, which forms a receiving cavity, the driving power supply is received in the housing, and the light-emitting device is disposed on a surface of the housing.

[0022] Optionally, the light-emitting device is an LED lamp.

[0023] The technical solution of the present utility model constitutes a configurable current regulation circuit by configuring an interface, a control circuit and a plurality of shunt circuits, which is applied to the driving power supply of a lighting fixture. The driving power supply includes a power supply circuit and a driving circuit, and an output end of the power supply circuit is connected to an input end of the driving circuit. Among them, the configuration interface is used to connect an external control device; an input end of the control circuit is connected to the configuration interface, and the control circuit is used to receive a dimming signal output by the external control device and output a corresponding current control signal; an input end of each shunt circuit is respectively connected to an output end of the control circuit, and output ends of the plurality of shunt circuits are connected to a current detection end of the driving circuit. The plurality of shunt circuits are used to shunt a current detection signal of the driving circuit according to the current control signal. In this way, by receiving the dimming signal of the external control device through the configuration interface, the output current of the driving circuit can be controlled through the control circuit, thereby changing the brightness of the lighting fixture. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0025] Figure 1 is a functional module schematic diagram of the configurable current regulation circuit of the present utility model.

[0026] Figure 2 is a circuit structure schematic diagram of the configurable current regulation circuit of the present utility model.

[0027] Description of the reference numerals: 10, configuration interface; 20, control circuit; 30, shunt circuit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; S1, first NMOS transistor; S2, second NMOS transistor. Detailed Embodiments

[0028] To make the objectives, technical solutions and effects of the present utility model clearer and more definite, the following further elaborates on the present utility model with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are merely used to explain the present utility model and are not intended to limit the present utility model.

[0029] In the embodiments and the scope of the patent application, unless otherwise specifically defined in the text for articles, the words "a", "an", "the" and "said" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0030] It should be further understood that the term "comprising" used in the description of the present utility model means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or wireless coupling. The phrase "and / or" used here includes all or any unit and all combinations of one or more related listed items.

[0031] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art to which the present utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0032] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] As a lighting device, a lamp can be applied in various places, and in different places, the brightness requirements for the lamp will also be different. Currently, for lamps, usually switch gears or multiple fixed brightness gears are set, and the brightness of the lamp cannot be changed according to the actual environmental conditions.

[0034] To solve the above problems, the present utility model proposes a configurable current regulation circuit, which is applied to the driving power supply of a lamp. The driving power supply includes a power supply circuit and a driving circuit, and the output end of the power supply circuit is connected to the input end of the driving circuit.

[0035] Referring to Figure 1 , in one embodiment, the configurable current regulation circuit includes:

[0036] A configuration interface 10 for connecting to an external control device;

[0037] A control circuit 20, the input end of the control circuit 20 is connected to the configuration interface 10, and the control circuit 20 is used to receive a dimming signal output by an external control device and output a corresponding current control signal;

[0038] A plurality of shunt circuits 30, the input end of each shunt circuit 30 is respectively connected to an output end of the control circuit 20, the output ends of the plurality of shunt circuits 30 are connected to the current detection end of the driving circuit, and the plurality of shunt circuits 30 are used to shunt the current detection signal of the driving circuit according to the current control signal.

[0039] In this embodiment, the configuration interface 10 may be a plug or an interface, which can be specifically set according to an external control device. The external control device may be a computer device or a mobile phone, etc. The user can manually operate the external control device to output a dimming signal, or set the external control device to automatically output a dimming signal. Specifically, the external control device can be connected before the lamp works for control, or can also be connected when the lamp is working for control. The control circuit 20 can be composed of a control chip and other electronic components. The control circuit 20 can receive the dimming signal output by the external control device through the configuration interface 10, which can be specifically an electrical signal with different voltage values, or a PWM signal with different duty cycles. The specific dimming signal can be set according to the user's needs. According to the dimming signal, the control circuit 20 can output current control signals corresponding to multiple shunt circuits 30, so as to control the multiple shunt circuits 30 to shunt the current detection signal of the drive circuit. The shunt circuit 30 can be composed of multiple resistors and switching devices. The multiple shunt circuits 30 are connected in parallel between the output end of the control circuit 20 and the current detection end of the drive circuit. In this way, by controlling the conduction or cut-off of a switching device, it is possible to control whether the shunt circuit 30 corresponding to the switching device is conducting, so as to change the resistance value between the path of the control circuit 20 and the drive circuit, so as to change the output current of the drive circuit, that is, to shunt the current detection signal. The number, resistance value of the resistors and the type of the switching devices in the shunt circuit 30 can be set according to the user's needs and actual situation. In this way, when a lighting device in the lamp is connected to the output end of the drive circuit, the brightness of the lighting device can be changed, so that the lamp with the configurable current adjustment circuit in this solution can adjust the brightness according to the actual environment and the user's needs, and can be applied to a variety of scenarios.

[0040] The technical solution of the present utility model constitutes a configurable current adjustment circuit through the configuration interface 10, the control circuit 20 and multiple shunt circuits 30, which is applied to the drive power supply of the lamp. The drive power supply includes a power supply circuit and a drive circuit, and the output end of the power supply circuit is connected to the input end of the drive circuit. Among them, the configuration interface 10 is used to connect an external control device; the input end of the control circuit 20 is connected to the configuration interface 10, and the control circuit 20 is used to receive the dimming signal output by the external control device and output a corresponding current control signal; the input end of each shunt circuit 30 is respectively connected to an output end of the control circuit 20, and the output ends of the multiple shunt circuits 30 are connected to the current detection end of the drive circuit. The multiple shunt circuits 30 are used to shunt the current detection signal of the drive circuit according to the current control signal. In this way, by receiving the dimming signal of the external control device through the configuration interface 10 in this solution, the output current of the drive circuit can be controlled through the control circuit 20, so as to change the brightness of the lamp.

[0041] It can be understood that in an exemplary technology, the configuration interface 10 can be replaced by a communication circuit to achieve the communication connection between the external control device and the control circuit 20, and complete the data transmission from the external control device to the control circuit 20. The communication circuit can be a wireless communication circuit or a wired communication circuit, which is specifically selected according to user requirements and actual situations.

[0042] In one embodiment, the control circuit 20 includes:

[0043] A controller having a plurality of output terminals, each output terminal of the controller is connected to an input terminal of a shunt circuit 30, the input terminal of the controller is connected to the configuration interface 10, and the controller is configured to receive a dimming signal output by an external control device and output a corresponding current control signal to the plurality of shunt circuits 30.

[0044] In this embodiment, the controller can be a digital signal processor (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a microprocessor, an MCU single-chip microcomputer or other electronic components; the plurality of output terminals of the controller can also be a plurality of output pins, and each output pin of the controller is respectively connected to an input terminal of a shunt circuit 30. In this way, the controller can output a corresponding electrical signal, that is, a current control signal to each shunt circuit 30 to independently control a shunt circuit 30; in this way, different current control signals output by the controller through the plurality of output terminals can control the shunt circuit 30 to form different shunt situations, so that the output current of the driving circuit changes.

[0045] In one embodiment, the control circuit 20 further includes:

[0046] A timer connected to the controller, the controller is configured to control the timer to start timing when receiving a timing signal output by an external control device, and when receiving a timing trigger signal output by the timer, output a corresponding current control signal to the plurality of shunt circuits 30 according to the dimming signal output by the external control device.

[0047] In this embodiment, the timing time of the timer can be preset to one hour, and the specific time can be set according to the actual situation and user requirements, which is not limited in this embodiment; after the timing time of the timer reaches the preset time, a timing trigger signal will be output to the controller. After receiving the timing trigger signal, the controller can output a corresponding current control signal to the plurality of shunt circuits 30 according to the dimming signal output by the external control device. In this way, the segmented lighting of the lamp can be realized. For example, the required light intensity is low during the day, or no light intensity is required, and the required light intensity is high at night. In this way, a timing signal can be output to the controller by an external device during the day. Before the timer outputs the timing trigger signal, the controller controls the shunt circuit 30 to keep the output current of the drive circuit at a relatively low value, so that the lighting brightness of the lamp is low. After the timer outputs the timing trigger signal, the controller can control the shunt circuit 30 according to the dimming signal output by the external control device to change the output current of the drive circuit, so that the lighting brightness of the lamp becomes high. In this embodiment, by adding a timer on the basis of the above configurable current adjustment circuit, the function of adjusting the segmented lighting brightness of the lamp can be realized, thereby reducing the energy consumption of the lamp and improving the intelligence of the lamp.

[0048] Referring to Figure 2 , in one embodiment, the shunt circuit 30 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first NMOS transistor S1. The first end of the first resistor R1 is connected to the output end of the control circuit 20. The second end of the first resistor R1, the first end of the second resistor R2, and the gate of the first NMOS transistor S1 are interconnected. The second end of the second resistor R2 and the source of the first NMOS transistor S1 are grounded. The drain of the first NMOS transistor S1 is connected to the first end of the third resistor R3. The second end of the third resistor R3 is connected to the current detection end of the drive circuit.

[0049] In this embodiment, the switching transistor of the shunt circuit 30 can be a switching device such as a MOS transistor or a triode. In this embodiment, an NMOS transistor is used. If other switching transistors are used, the control signal output by the control circuit 20 and the circuit structure need to be changed correspondingly; the first resistor R1 can connect the gate of the first NMOS transistor S1 to an output pin of the controller; the second resistor R2 can connect the source of the first NMOS transistor S1 to the signal ground; the third resistor R3 can be used as a voltage dividing resistor to play a voltage dividing role. It should be noted that the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3 in each shunt circuit 30 can be set to different values.

[0050] In one embodiment, the configuration interface 10 includes:

[0051] A data port for connecting to the data output terminal of an external control device, and the data port is also connected to the input terminal of the control circuit 20, and the control circuit 20 is configured to receive a dimming signal output by the external control device through the data port;

[0052] A power port for connecting to the power output terminal of an external control device, and the power port is also connected to the power supply terminal of the control circuit 20, and the control circuit 20 is configured to receive a power supply voltage output by the external control device through the power port.

[0053] In this embodiment, the configuration interface 10 may include a data port and a power port, so that the control circuit 20 can receive the dimming signal output by the external control device and receive the power supply voltage output by the external control device to provide a working voltage for devices such as the controller in the control circuit 20.

[0054] The present utility model also provides a driving power supply.

[0055] In one embodiment, the driving power supply includes a power supply circuit, a driving circuit, and the configurable current regulating circuit as described above. The input terminal of the power supply circuit is configured to connect to an external power supply. The output terminal of the power supply circuit is connected to the input terminal of the driving circuit. The current setting terminal of the driving circuit is connected to the output terminals of a plurality of shunt circuits 30 in the configurable current regulating circuit. The output terminal of the driving circuit is configured to connect to a light emitting device.

[0056] In this embodiment, the power supply circuit may be composed of a DC-DC conversion circuit or a power supply chip. The power supply circuit can connect to an external power supply, convert the external power supply into a working voltage suitable for the operation of the light emitting device, and then output it to the light emitting device through the driving circuit. The current output by the driving circuit to the light emitting device will be affected by a plurality of shunt circuits 30 in the configurable current regulating circuit, so as to realize the dimming of the light emitting device through the configurable current regulating circuit. It can be understood that since the above-mentioned configurable current regulating circuit is used in the driving power supply of the present utility model, the embodiments of the driving power supply of the present utility model include all the technical solutions of all the embodiments of the above-mentioned configurable current regulating circuit, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0057] Refer to Figure 2, in one embodiment, the driving circuit includes a driving chip, a transformer, a fourth resistor R4, a fifth resistor R5, and a second NMOS transistor S2. The first end of the fourth resistor R4 is connected to the current setting pin of the driving chip and is connected to the output ends of multiple shunt circuits 30 in the configurable current adjustment circuit. The second end of the fourth resistor R4, the first end of the fifth resistor R5, and the source electrode of the second NMOS transistor S2 are connected. The second end of the fifth resistor R5 is grounded. The gate of the second NMOS transistor S2 is connected to the control end of the driving chip. The drain of the second NMOS transistor S2 is connected to the input end of the transformer.

[0058] In this embodiment, the fourth resistor R4 can be used to set the output current. The fifth resistor R5 connects the current to the current setting pin of the driving chip. The second NMOS transistor S2 can be turned on or off by the voltage signal output by the driving chip, thereby controlling whether the power supply voltage can be output to the light-emitting device.

[0059] The present utility model also proposes a lighting fixture.

[0060] In one embodiment, the lighting fixture includes a light-emitting device and the driving power supply as described above. The output end of the driving circuit in the driving power supply is connected to the power supply end of the light-emitting device. In this embodiment, it can be understood that since the above driving power supply is used in the lighting fixture of the present utility model, therefore, the embodiments of the lighting fixture of the present utility model include all the technical solutions of all the embodiments of the above driving power supply, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0061] In one embodiment, the lighting fixture further includes:

[0062] A housing, the housing forms a receiving cavity, the driving power supply is received in the housing, and the light-emitting device is disposed on the surface of the housing.

[0063] In this embodiment, the power supply circuit, the driving circuit, and the configurable current adjustment circuit of the driving power supply in the lighting fixture can be disposed on a circuit board. The housing can be used to fix the positional relationship of the circuit board, ensuring the safety and stability inside the receiving cavity formed by the lighting fixture housing. When the lighting fixture is working, the positional relationship of the circuit board will not change, and external gases or objects cannot fall on the circuit board, affecting the operation of the power supply circuit, the driving circuit, and the configurable current adjustment circuit on the circuit board.

[0064] In one embodiment, the light-emitting device is an LED lamp.

[0065] In this embodiment, an LED lamp can be used as the light-emitting device in the lighting fixture. The specific quantity, type, and the light-emitting color of the LED lamp can be set according to the actual situation and user requirements.

[0066] It should be understood that the application of the present utility model is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A configurable current regulation circuit is applied to the driving power supply of a lamp. The driving power supply includes a power supply circuit and a driving circuit. The output end of the power supply circuit is connected to the input end of the driving circuit. It is characterized in that The configurable current regulation circuit includes: A configuration interface for connecting to an external control device; A control circuit, the input end of the control circuit is connected to the configuration interface, and the control circuit is used to receive a dimming signal output by the external control device and output a corresponding current control signal; A plurality of shunt circuits, the input end of each shunt circuit is respectively connected to an output end of the control circuit, and the output ends of the plurality of shunt circuits are connected to the current detection end of the drive circuit. The plurality of shunt circuits are used to shunt the current detection signal of the drive circuit according to the current control signal.

2. The configurable current regulation circuit according to claim 1, wherein The control circuit includes: A controller, the controller has a plurality of output ends, the output end of each controller is connected to the input end of a shunt circuit, the input end of the controller is connected to the configuration interface, and the controller is used to receive the dimming signal output by the external control device and output a corresponding current control signal to the plurality of shunt circuits.

3. The configurable current regulation circuit according to claim 2, wherein The control circuit further includes: A timer, connected to the controller. The controller is used to control the timer to start timing when receiving a timing signal output by the external control device, and when receiving a timing trigger signal output by the timer, output a corresponding current control signal to the plurality of shunt circuits according to the dimming signal output by the external control device.

4. The configurable current regulation circuit according to claim 1, wherein The shunt circuit includes a first resistor, a second resistor, a third resistor and a first NMOS transistor. The first end of the first resistor is connected to the output end of the control circuit. The second end of the first resistor, the first end of the second resistor and the gate of the first NMOS transistor are interconnected. The second end of the second resistor and the source of the first NMOS transistor are grounded. The drain of the first NMOS transistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the current detection end of the drive circuit.

5. The configurable current regulation circuit according to claim 1, characterized in that, The configuration interface includes: A data port for connecting to the data output end of the external control device. The data port is also connected to the input end of the control circuit, and the control circuit is used to receive the dimming signal output by the external control device through the data port; A power supply port for connecting to the power supply output end of the external control device. The power supply port is also connected to the power supply end of the control circuit, and the control circuit is used to receive the power supply voltage output by the external control device through the power supply port.

6. A driving power supply, characterized in that It includes a power supply circuit, a drive circuit and the configurable current regulation circuit according to any one of claims 1-5. The input end of the power supply circuit is used to connect to an external power supply. The output end of the power supply circuit is connected to the input end of the drive circuit. The current setting end of the drive circuit is connected to the output ends of the plurality of shunt circuits in the configurable current regulation circuit. The output end of the drive circuit is used to connect to a light-emitting device.

7. The drive power supply according to claim 6, wherein The driving circuit includes a driving chip, a transformer, a fourth resistor, a fifth resistor, and a second NMOS transistor. The first end of the fourth resistor is connected to the current setting pin of the driving chip and is connected to the output ends of multiple shunt circuits in the configurable current regulation circuit. The second end of the fourth resistor, the first end of the fifth resistor, and the source electrode of the second NMOS transistor are connected. The second end of the fifth resistor is grounded. The gate electrode of the second NMOS transistor is connected to the control end of the driving chip. The drain electrode of the second NMOS transistor is connected to the input end of the transformer.

8. A lighting fixture, characterized in that, It includes a light-emitting device and the driving power supply according to any one of claims 6-7. The output end of the driving circuit in the driving power supply is connected to the power supply end of the light-emitting device.

9. The luminaire according to claim 8, characterized in that, It further includes: A housing, which forms a receiving cavity. The driving power supply is received in the housing, and the light-emitting device is disposed on the surface of the housing.

10. The luminaire according to claim 8, wherein, The light-emitting device is an LED lamp.

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