Lighting device with current self-balancing function

Abstract

A lighting device with current self-balancing function is provided. [Solution] A lighting device 1 with a current self-balancing function includes an input module 11, a first light-emitting module 12A, a second light-emitting module 12B, and a current adjustment module 13. The input module has a first input terminal LED+ and a second input terminal LED-. The first light-emitting module includes a plurality of first light sources LD1 connected in series, and one end of the first light-emitting module is connected to the first input terminal. The second light-emitting module includes a plurality of second light sources LD2 connected in series, and one end of the second light-emitting module is connected to the first input terminal. The current adjustment module includes a first switch Q1 and a second switch Q2. The other end of the first light-emitting module is connected to the second input terminal via the first switch, and the other end of the second light-emitting module is connected to the second input terminal via the second switch. The first switch is connected to the second switch.

Description

[Technical field]

[0001] The present invention relates to a lighting device, and more particularly to a lighting device with current self-balancing function. [Background technology]

[0002] Due to the error of the manufacturing process, even light-emitting diodes of the same model number will have a certain voltage difference. In order to make the light emitted by the light-emitting diodes more uniform, manufacturers of lighting devices usually connect multiple light-emitting diodes in series or connect a small number of light-emitting diodes in parallel to make the current flowing through these light-emitting diodes as constant as possible. However, the current between multiple series circuits (or multiple parallel circuits) is still not consistent. If the voltage of any series circuit (or parallel circuit) is too low, the current of the series circuit (or parallel circuit) will increase, causing the series circuit (or parallel circuit) to overheat, which may damage the lighting fixture. Therefore, the performance and reliability of conventional lighting devices still have room for improvement. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides a lighting device with current self-balancing function. [Means for solving the problem]

[0004] According to an embodiment of the present invention, a lighting device with current self-balancing function is provided, which includes an input module, a first light-emitting module, a second light-emitting module, and a current adjustment module. The input module has a first input terminal and a second input terminal. The first light-emitting module includes a plurality of first light sources connected in series, and one end of the first light-emitting module is connected to the first input terminal. The second light-emitting module includes a plurality of second light sources connected in series, and one end of the second light-emitting module is connected to the first input terminal. The current adjustment module includes a first switch and a second switch. The other end of the first light-emitting module is connected to the second input terminal via the first switch, and the other end of the second light-emitting module is connected to the second input terminal via the second switch. The first switch is connected to the second switch.

[0005] In one embodiment, a first terminal of the first switch is connected to the other terminal of the first light-emitting module and a second terminal of the first switch. A second terminal of the first switch is connected to a second terminal of the second switch. A first terminal of the second switch is connected to the other terminal of the second light-emitting module. A third terminal of the first switch and a third terminal of the second switch are connected to the second input terminal.

[0006] In one embodiment, the first switch and the second switch are triodes.

[0007] In one embodiment, the collector of the first switch is connected to the other end of the first light emitting module and the base of the first switch. The base of the first switch is connected to the base of the second switch. The collector of the second switch is connected to the other end of the second light emitting module. The emitter of the first switch and the emitter of the second switch are connected to the second input terminal.

[0008] In one embodiment, the current through the first light emitting module is substantially equal to the current through the second light emitting module.

[0009] In one embodiment, the lighting device further includes a third light-emitting module, and the current regulating module further includes a third switch. The third light-emitting module includes a plurality of third light sources connected in series. One end of the third light-emitting module is connected to the first input terminal. The other end of the third light-emitting module is connected to the second input terminal via the third switch. The third switch is connected to the first switch.

[0010] In one embodiment, a first end of the third switch is connected to the other end of the third light-emitting module, a second terminal of the third switch is connected to the second terminal of the first switch, and a third terminal of the third switch is connected to the second input terminal.

[0011] In one embodiment, the first switch, the second switch and the third switch are triodes.

[0012] In one embodiment, the collector of the first switch is connected to the other end of the first light-emitting module and the base of the first switch. The base of the first switch is connected to the base of the second switch and the base of the third switch. The collector of the second switch is connected to the other end of the second light-emitting module. The collector of the third switch is connected to the other end of the third light-emitting module. The emitter of the first switch, the emitter of the second switch, and the emitter of the third switch are connected to the second input terminal.

[0013] In one embodiment, the current through the first light emitting module, the current through the second light emitting module, and the current through the third light emitting module are substantially equal. Effect of the Invention

[0014] Based on the above, a lighting device with current self-balancing function according to an embodiment of the present invention may have one or more of the following advantages. (1) In one embodiment of the present invention, a lighting device includes an input module, a first light-emitting module, a second light-emitting module, and a current adjustment module. The input module includes a first input terminal and a second input terminal. The first light-emitting module includes a plurality of first light sources connected in series, and one end of the first light-emitting module is connected to the first input terminal. The second light-emitting module includes a plurality of second light sources connected in series, and one end of the second light-emitting module is connected to the first input terminal. The current adjustment module includes a first switch and a second switch. The other end of the first light-emitting module is connected to the second input terminal through the first switch, and the other end of the second light-emitting module is connected to the second input terminal through the second switch. The first switch is connected to the second switch. Through the circuit design of the current adjustment module described above, the current flowing through the first light-emitting module is substantially equal to the current flowing through the second light-emitting module, which allows the lighting device to achieve a current self-balancing effect. Therefore, the performance of the lighting device can be greatly improved. (2) In one embodiment of the present invention, the lighting device has a current regulating module, and the current regulating module has a current self-balancing function, which makes the current passing through the first light-emitting module and the current passing through the second light-emitting module substantially equal. In this way, the lighting device can effectively achieve the current self-balancing effect, prevent the light-emitting module of the lighting device from overheating, and avoid the damage of the lighting device caused by overheating. Therefore, the reliability of the lighting device is greatly improved, and the lighting device can better meet the needs of practical applications. (3) In one embodiment of the present invention, the lighting device has a current regulating module, and the current regulating module has a current self-balancing function, so that the lighting device can effectively achieve the current self-balancing effect, prevent the light-emitting module of the lighting fixture from overheating, and avoid the lighting device from being damaged by overheating, thereby effectively extending the service life of the lighting device and meeting the requirements of environmental protection. (4) In one embodiment of the present invention, the circuit design of the current regulation module of the lighting device is simple, and the current self-balancing function can be effectively provided without the need for an additional controller, which can further reduce the cost of the lighting device, and further expand the application of the lighting device and make the use more flexible. Therefore, the lighting device can meet the requirements of different users. (5) In one embodiment of the present invention, the design of the lighting device is simple, so that the lighting device can achieve the desired effect while keeping costs down, and therefore the lighting device can achieve high practicality, meet the requirements of different applications, and better adapt to future development trends. [Brief description of the drawings]

[0015] [Figure 1] 1 is a circuit diagram of a lighting device with current self-balancing function according to an embodiment of the present invention; [Diagram 2] FIG. 10 is a circuit diagram of a lighting device with current self-balancing function according to another embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In the following embodiments, the detailed features and advantages of the present invention are described, the contents of which are sufficient to enable those skilled in the art to understand the technical contents of the present invention and implement them accordingly, and the disclosure contents of this specification, the claims and drawings of the utility model registration can enable those skilled in the art to easily understand the objectives and advantages of the present invention.

[0017] Hereinafter, the embodiment of the lighting device with current self-balancing function of the present invention will be described with reference to the related drawings. For the sake of clarity and ease of description in the drawings, the dimensions and ratios of each member in the drawings may be exaggerated or reduced. In the following description and / or the claims, when a member is described as being "connected" or "coupled" to another member, it may be directly connected or coupled to the other member, or an intermediate member may be present. When a member is described as being "directly connected" or "directly coupled" to another member, there is no intermediate member, and other terms for describing the relationship between members or layers should be interpreted in the same manner. For ease of understanding, the same members in the following embodiments will be denoted and described with the same reference numerals.

[0018] 1 is a circuit diagram of a lighting device with current self-balancing function according to an embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a first light-emitting module 12A, a second light-emitting module 12B and a current adjustment module 13.

[0019] The input module 11 includes a first input terminal LED+ and a second input terminal LED-. The input module 11 is connected to a power supply module (not shown), which is connected to an external power source (such as a commercial power source or a generator). The power supply module may include a filter circuit, a rectifier circuit, a power factor correction circuit, a voltage converter, etc., and the circuit structure and function of the power supply module are well known to those skilled in the art, so they will not be described in detail here. In one embodiment, the first input terminal LED+ may be a positive input terminal, and the second input terminal LED- may be a negative input terminal. In another embodiment, the first input LED+ may be a negative input terminal, and the second input terminal LED- may be a positive input terminal.

[0020] The first light emitting module 12A includes a plurality of first light sources LD1, and the plurality of first light sources LD1 are connected in series. One end of the first light emitting module 12A (the positive pole of the first light source LD1 at the front end of the first light emitting module 12A) is connected to a first input terminal LED+. In one embodiment, the plurality of first light sources LD1 are light emitting diodes. In another embodiment, the plurality of first light sources LD1 may be a light emitting diode array.

[0021] The second light emitting module 12B includes a plurality of second light sources LD2, and the plurality of second light sources LD2 are connected in series. One end of the second light emitting module 12B (the positive electrode of the second light source LD2 at the front end of the second light emitting module 12B) is connected to the first input terminal LED+. In one embodiment, the plurality of second light sources LD2 are light emitting diodes. In another embodiment, the plurality of second light sources LD2 may be a light emitting diode array.

[0022] The current regulation module 13 includes a first switch Q1 and a second switch Q2. In this embodiment, the first switch Q1 and the second switch Q2 are triodes (BJTs). In other embodiments, the first switch Q1 and the second switch Q2 may be other similar components.

[0023] The other end of the first light emitting module 12A is connected to the second input terminal LED- via the first switch Q1, and the other end of the second light emitting module 12B is connected to the second input terminal LED- via the second switch Q2. The first switch Q1 is connected to the second switch Q2. Among them, the first terminal of the first switch Q1 is connected to the other end of the first light emitting module 12A and the second terminal of the first switch Q1, and the second terminal of the first switch Q1 is connected to the second terminal of the second switch Q2. The first terminal of the second switch Q2 is connected to the other end of the second light emitting module 12B. The third terminal of the first switch Q1 and the third terminal of the second switch Q2 are connected to the second input terminal LED-. As described above, in this embodiment, the first switch Q1 and the second switch Q2 are triodes. The collector c1 of the first switch Q1 is connected to the other end of the first light emitting module 12A (the negative electrode of the first light source LD1 at the rear end of the first light emitting module 12A) and the base b1 of the first switch Q1. The base b1 of the first switch Q1 is connected to the base b2 of the second switch Q2. The collector c2 of the second switch Q2 is connected to the other end of the second light-emitting module 12B (the negative electrode of the second light source LD2 at the rear end of the second light-emitting module 12B). The emitter e1 of the first switch Q1 and the emitter e2 of the second switch Q2 are connected to the second input terminal LED-.

[0024] According to the above circuit design, the base b1 of the first switch Q1 is connected to the base b2 of the second switch Q2, so that the current flowing through the base b1 of the first switch Q1 is substantially equal to the current flowing through the base b2 of the second switch Q2. Also, due to the characteristics of the triode, the current flowing through the collector c1 of the first switch Q1 is β times the current flowing through the base b1 of the first switch Q1. Similarly, the current flowing through the collector c2 of the second switch Q2 is β times the current flowing through the base b2 of the second switch Q2. Therefore, the current flowing through the collector c1 of the first switch Q1 is substantially equal to the current flowing through the collector c2 of the second switch Q2. The current flowing through the collector c1 of the first switch Q1 is the current flowing through the first light-emitting module 12A, and the current flowing through the collector c2 of the second switch Q2 is the current flowing through the second light-emitting module 12B. Therefore, the current through the first lighting module 12A is substantially equal to the current through the second lighting module 12B.

[0025] As can be seen from the above, the lighting device 1 includes an input module 11, a first light-emitting module 12A, a second light-emitting module 12B, and a current adjustment module 13. The input module 11 includes a first input terminal LED+ and a second input terminal LED-. The first light-emitting module 12A includes a plurality of first light sources LD1 connected in series, and one end of the first light-emitting module 12A is connected to the first input terminal LED+. The second light-emitting module 12B includes a plurality of second light sources LD2 connected in series, and one end of the second light-emitting module 12B is connected to the first input terminal LED+. The current adjustment module 13 includes a first switch Q1 and a second switch Q2. The other end of the first light-emitting module 12A is connected to the second input terminal LED- via the first switch Q1, and the other end of the second light-emitting module 12B is connected to the second input terminal LED- via the second switch Q2. The first switch Q1 is connected to the second switch Q2. Through the above-mentioned circuit design of the current regulating module 13, the current flowing through the first light-emitting module 12A and the current flowing through the second light-emitting module 12B are substantially equal, which allows the lighting device 1 to achieve a current self-balancing effect, and therefore the performance of the lighting device 1 can be greatly improved.

[0026] In addition, in this embodiment, the lighting device 1 can effectively achieve a current self-balancing effect, which prevents the first light emitting module 12A and the second light emitting module 12B of the lighting device 1 from overheating and prevents damage to the lighting device 1 caused by overheating. Therefore, the reliability of the lighting device 1 is greatly improved, and the lighting device 1 can better meet the needs of practical applications.

[0027] In addition, in this embodiment, the lighting device 11 has a current regulating module 13, and the current regulating module 13 has a current self-balancing function, so that the lighting device 1 can effectively achieve a current self-balancing effect to prevent the first light-emitting module 12A and the second light-emitting module 12B of the lighting device 1 from overheating, and avoid damage to the lighting device 1 caused by overheating. Therefore, the service life of the lighting device 1 can be effectively extended and the requirements for environmental protection can be met. In addition, the cost of the lighting device 1 can be further reduced, the application of the lighting device 1 can be further expanded, and the use can be more flexible. Therefore, the lighting device 1 can meet the requirements of different users.

[0028] Of course, this embodiment is only used for illustrative purposes, and does not limit the scope of the present invention, and any equivalent modifications or variations based on the lighting device with current self-balancing function of this embodiment should still fall within the protection scope of the present invention.

[0029] It should be noted that lighting device manufacturers usually connect multiple light-emitting diodes in series or connect a small number of light-emitting diodes in parallel to make the current through these light-emitting diodes as constant as possible. However, the current between multiple series circuits (or multiple parallel circuits) is still not consistent. If the voltage of any series circuit (or parallel circuit) is very low, the current of the series circuit (or parallel circuit) will increase, causing the series circuit (or parallel circuit) to overheat and possibly damaging the lighting fixture. Therefore, the performance and reliability of the conventional lighting device still have room for improvement. In contrast, according to an embodiment of the present invention, the lighting device includes an input module, a first light-emitting module, a second light-emitting module, and a current adjustment module. The input module includes a first input terminal and a second input terminal. The first light-emitting module includes a plurality of first light sources connected in series, and one end of the first light-emitting module is connected to the first input terminal. The second light-emitting module includes a plurality of second light sources connected in series, and one end of the second light-emitting module is connected to the first input terminal. The current adjustment module includes a first switch and a second switch. The other end of the first light-emitting module is connected to the second input terminal through the first switch, and the other end of the second light-emitting module is connected to the second input terminal through the second switch. The first switch is connected to the second switch. Through the circuit design of the current regulating module described above, the current flowing through the first light-emitting module is substantially equal to the current flowing through the second light-emitting module, which allows the lighting device to achieve a current self-balancing effect. Therefore, the performance of the lighting device can be greatly improved.

[0030] In addition, according to an embodiment of the present invention, the lighting device has a current regulating module, and the current regulating module has a current self-balancing function, which makes the current passing through the first light-emitting module and the current passing through the second light-emitting module substantially equal. In this way, the lighting device can effectively achieve the current self-balancing effect, prevent the light-emitting module of the lighting device from overheating, and avoid the damage of the lighting device caused by overheating. Therefore, the reliability of the lighting device is greatly improved, and the lighting device can better meet the needs of practical applications.

[0031] In addition, according to the embodiment of the present invention, the lighting device has a current regulating module, and the current regulating module has a current self-balancing function, so that the lighting device can effectively achieve the current self-balancing effect, prevent the light-emitting module of the lighting fixture from overheating, and avoid the lighting device from being damaged by overheating, thereby effectively extending the service life of the lighting device and meeting the requirements of environmental protection.

[0032] In addition, according to the embodiment of the present invention, the circuit design of the current regulation module of the lighting device is simple, and the current self-balancing function can be effectively provided without the need for an additional controller, so that the cost of the lighting device can be further reduced, the application of the lighting device can be further expanded, and the use can be more flexible, so that the lighting device can meet the requirements of different users.

[0033] Furthermore, according to the embodiment of the present invention, the design of the lighting device is simple, so that the desired effect can be achieved while keeping costs down. Therefore, the lighting device can achieve high practicality, meet the requirements of different applications, and better meet the future development trend. From the above, it can be seen that the lighting device with current self-balancing function according to the embodiment of the present invention can indeed achieve excellent technical effects.

[0034] 2 is a circuit diagram of a lighting device with current self-balancing function according to another embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a first light-emitting module 12A, a second light-emitting module 12B, a third light-emitting module 12C, and a current adjustment module 13. In this embodiment, the lighting device 1 includes three light-emitting modules, but the number of light-emitting modules is only an example. In another embodiment, the lighting device 1 may further include four or more light-emitting modules.

[0035] The input module 11 includes a first input terminal LED+ and a second input terminal LED-. The input module 11 is connected to a power supply module (not shown), which is connected to an external power source (such as a commercial power source or a generator). The power supply module may include a filter circuit, a rectifier circuit, a power factor correction circuit, a voltage converter, etc., and the circuit structure and function of the power supply module are well known to those skilled in the art and will not be described in detail here. The first input terminal LED+ may be a positive input terminal, and the second input terminal LED- may be a negative input terminal.

[0036] The first light emitting module 12A includes a plurality of first light sources LD1, which are connected in series. One end of the first light emitting module 12A (the positive electrode of the first light source LD1 at the front end of the first light emitting module 12A) is connected to the first input terminal LED+. The plurality of first light sources LD1 may be light emitting diodes.

[0037] The second light emitting module 12B includes a plurality of second light sources LD2, which are connected in series. One end of the second light emitting module 12B (the positive electrode of the second light source LD2 at the front end of the second light emitting module 12B) is connected to the first input terminal LED+. The plurality of second light sources LD2 may be light emitting diodes.

[0038] The third light emitting module 12C includes a plurality of third light sources LD3, which are connected in series. One end of the third light emitting module 12C (the positive electrode of the third light source LD3 at the front end of the third light emitting module 12C) is connected to the first input terminal LED+. The plurality of third light sources LD2 may be light emitting diodes.

[0039] The current regulation module 13 includes a first switch Q1, a second switch Q2, and a third switch Q3. In this embodiment, the first switch Q1, the second switch Q2, and the third switch Q3 are triodes (BJT). In another embodiment, the first switch Q1, the second switch Q2, and the third switch Q3 may be other similar switch components.

[0040] The other end of the first light-emitting module 12A is connected to the second input terminal LED- via the first switch Q1, the other end of the second light-emitting module 12B is connected to the second input terminal LED- via the second switch Q2, and the other end of the third light-emitting module 12C is connected to the second input terminal LED- via the third switch Q3. The first switch Q1 is connected to the second switch Q2 and the third switch Q3. Among them, the first terminal of the first switch Q1 is connected to the other end of the first light-emitting module 12A and the second terminal of the first switch Q1, and the second terminal of the first switch Q1 is connected to the second terminal of the second switch Q2 and the second terminal of the third switch Q3. The first terminal of the second switch Q2 is connected to the other end of the second light-emitting module 12B. The third terminal of the first switch Q1, the third terminal of the second switch Q2, and the third terminal of the third switch Q3 are connected to the second input terminal LED-. As described above, in this embodiment, the first switch Q1, the second switch Q2, and the third switch Q3 are triodes. The collector c1 of the first switch Q1 is connected to the other end of the first light emitting module 12A (the negative pole of the first light source LD1 at the rear end of the first light emitting module 12A) and the base b1 of the first switch Q1. The base b1 of the first switch Q1 is connected to the base b2 of the second switch Q2 and the base b3 of the third switch Q3. The collector c2 of the second switch Q2 is connected to the other end of the second light emitting module 12B (the negative pole of the second light source LD2 at the rear end of the second light emitting module 12B). The collector c3 of the third switch Q3 is connected to the other end of the third light emitting module 12C (the negative pole of the third light source LD3 at the rear end of the third light emitting module 12C). The emitter e1 of the first switch Q1, the emitter e2 of the second switch Q2, and the emitter e3 of the third switch Q3 are connected to the second input terminal LED-.

[0041] According to the above circuit design, the base b1 of the first switch Q1 is connected to the base b2 of the second switch Q2 and the base b3 of the third switch Q3, so that the current flowing through the base b1 of the first switch Q1 is substantially equal to the current flowing through the second switch Q2 and the current flowing through the base b2 of the third switch Q3. Also, due to the characteristics of the triode, the current flowing through the collector c1 of the first switch Q1 is β times the current flowing through the base b1 of the first switch Q1. Similarly, the current flowing through the collector c2 of the second switch Q2 is β times the current flowing through the base b2 of the second switch Q2. The current flowing through the collector c3 of the third switch Q3 is β times the current flowing through the base b3 of the third switch Q3. Therefore, the current flowing through the collector c1 of the first switch Q1 is substantially equal to the current flowing through the collector c2 of the second switch Q2 and the current flowing through the collector c3 of the third switch Q3. The current flowing through the collector c1 of the first switch Q1 is the current flowing through the first light-emitting module 12A, the current flowing through the collector c2 of the second switch Q2 is the current flowing through the second light-emitting module 12B, and the current flowing through the collector c3 of the third switch Q3 is the current flowing through the third light-emitting module 12C. Therefore, the current flowing through the first light-emitting module 12A is substantially equal to the current flowing through the second light-emitting module 12B and the current flowing through the third light-emitting module 12C.

[0042] Similarly, through the circuit design of the current regulating module 13 described above, the current flowing through the first light-emitting module 12A, the current flowing through the second light-emitting module 12B, and the current flowing through the third light-emitting module 12C are substantially equal, so that the lighting device 1 can also achieve the effect of current auto-balancing and other related technical effects, and therefore the lighting device 1 can meet the requirements of practical applications.

[0043] Of course, this embodiment is only used for illustrative purposes, and does not limit the scope of the present invention, and any equivalent modifications or variations based on the lighting device with current self-balancing function of this embodiment should still fall within the protection scope of the present invention.

[0044] In summary, according to an embodiment of the present invention, a lighting device includes an input module, a first light-emitting module, a second light-emitting module, and a current adjustment module. The input module includes a first input terminal and a second input terminal. The first light-emitting module includes a plurality of first light sources connected in series, and one end of the first light-emitting module is connected to the first input terminal. The second light-emitting module includes a plurality of second light sources connected in series, and one end of the second light-emitting module is connected to the first input terminal. The current adjustment module includes a first switch and a second switch. The other end of the first light-emitting module is connected to the second input terminal through the first switch, and the other end of the second light-emitting module is connected to the second input terminal through the second switch. The first switch is connected to the second switch. Through the circuit design of the current adjustment module described above, the current flowing through the first light-emitting module is substantially equal to the current flowing through the second light-emitting module, which allows the lighting device to achieve a current self-balancing effect. Therefore, the performance of the lighting device can be greatly improved.

[0045] In addition, according to an embodiment of the present invention, the lighting device has a current regulating module, and the current regulating module has a current self-balancing function, which makes the current passing through the first light-emitting module and the current passing through the second light-emitting module substantially equal. In this way, the lighting device can effectively achieve the current self-balancing effect, prevent the light-emitting module of the lighting device from overheating, and avoid the damage of the lighting device caused by overheating. Therefore, the reliability of the lighting device is greatly improved, and the lighting device can better meet the needs of practical applications.

[0046] In addition, according to the embodiment of the present invention, the lighting device has a current regulating module, and the current regulating module has a current self-balancing function, so that the lighting device can effectively achieve the current self-balancing effect, prevent the light-emitting module of the lighting fixture from overheating, and avoid the lighting device from being damaged by overheating, thereby effectively extending the service life of the lighting device and meeting the requirements of environmental protection.

[0047] In addition, according to the embodiment of the present invention, the circuit design of the current regulation module of the lighting device is simple, and the current self-balancing function can be effectively provided without the need for an additional controller, so that the cost of the lighting device can be further reduced, the application of the lighting device can be further expanded, and the use can be more flexible, so that the lighting device can meet the requirements of different users.

[0048] Moreover, according to the embodiments of the present invention, the design of the lighting device is simple, so that the desired effect can be achieved while reducing costs, and therefore the lighting device can achieve high practicality, meet the requirements of different applications, and better adapt to future development trends.

[0049] It should be noted that, although the above embodiments are described in this specification, they do not limit the scope of the utility model registration claims of the present invention. Therefore, based on the innovative concept of the present invention, the changes and modifications to the embodiments described in this specification, or the replacement of equivalent structures or equivalent processes using the contents of the specification and drawings of the present invention, and the direct or indirect application of the above technical solutions to other related technical fields are all within the scope of the utility model registration claims of the present invention. [Explanation of symbols]

[0050] 1 Lighting equipment 11 Input Module 12A First Light Emitting Module 12B Second light emitting module 13 Current Regulation Module Q1 First switch Q2 Second switch Q3 3rd switch c1 Collector of the first switch b1 Base of the first switch e1 Emitter of the first switch c2 Collector of the second switch b2 Second switch base e2 Emitter of the second switch c3 Collector of the third switch b3 Base of the third switch e3 Emitter of the third switch LD1 1st light source LD2 2nd light source LD3 3rd light source LED+ 1st input terminal LED- 2nd input terminal

Claims

1. an input module including a first input terminal and a second input terminal; a first light emitting module including a plurality of first light sources connected in series with each other, one end of the first light emitting module being connected to the first input terminal; a second light emitting module including a plurality of second light sources connected in series with each other, the second light emitting module having one end connected to the first input terminal; a current regulation module including a first switch and a second switch; Including, A lighting device with a current self-balancing function, characterized in that the other end of the first light-emitting module is connected to the second input terminal via the first switch, the other end of the second light-emitting module is connected to the second input terminal via the second switch, and the first switch is connected to the second switch.

2. 2. The lighting device with a current self-balancing function according to claim 1, wherein a first terminal of the first switch is connected to the other end of the first light-emitting module and a second terminal of the first switch, a second terminal of the first switch is connected to the second terminal of the second switch, a first end of the second switch is connected to the other end of the second light-emitting module, and a third end of the first switch and a third end of the second switch are connected to the second input terminal.

3. 3. The lighting device with current self-balancing function according to claim 2, wherein the first switch and the second switch are transistors.

4. 4. The lighting device with a current self-balancing function as described in claim 3, characterized in that the collector of the first switch is connected to the other end of the first light-emitting module and the base of the first switch, the base of the first switch is connected to the base of the second switch, the collector of the second switch is connected to the other end of the second light-emitting module, and the emitter of the first switch and the emitter of the second switch are connected to the second input terminal.

5. 5. The lighting device with current self-balancing function according to claim 4, wherein the current flowing through the first light-emitting module is substantially equal to the current flowing through the second light-emitting module.

6. 2. The lighting device with current self-balancing function according to claim 1, further comprising a third light-emitting module, the current regulating module further comprising a third switch, the third light-emitting module including a plurality of third light sources connected in series to each other, one end of the third light-emitting module being connected to the first input terminal, and the other end of the third light-emitting module being connected to the second input terminal via the third switch, the third switch being connected to the first switch.

7. 7. The lighting device with a current self-balancing function as described in claim 6, characterized in that a first terminal of the third switch is connected to the other end of the third light-emitting module, a second terminal of the third switch is connected to the second terminal of the first switch, and a third terminal of the third switch is connected to the second input terminal.

8. 8. The lighting device with current self-balancing function according to claim 7, wherein the first switch, the second switch and the third switch are transistors.

9. 9. The lighting device with a current self-balancing function according to claim 8, wherein a collector of the first switch is connected to the other end of the first light-emitting module and a base of the first switch, a base of the first switch is connected to the base of the second switch and a base of a third switch, a collector of the second switch is connected to the other end of the second light-emitting module, a collector of the third switch is connected to the other end of the third light-emitting module, and an emitter of the first switch, an emitter of the second switch, and an emitter of the third switch are connected to the second input terminal.

10. 10. The lighting device with current self-balancing function according to claim 9, wherein the current flowing through the first light-emitting module, the current flowing through the second light-emitting module, and the current flowing through the third light-emitting module are substantially equal.

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