Lighting fixture with harmonic suppression function

Abstract

To provide a lighting fixture with a harmonic suppression function.SOLUTION: A lighting device with a harmonic suppression function includes an input module, a harmonic suppression module, a rectifier module, a filter module, a voltage conversion module, and a light source module. The harmonic suppression module is connected to the input module. The rectifier module is connected to the harmonic suppression module. The filter module is connected to the rectifier module. The voltage conversion module is connected to the filter module. The light source module is connected to the voltage conversion module. The harmonic suppression module is disposed between the input module and the rectifier module. The harmonic suppression module is disposed in front of the rectifier module, which can effectively suppress harmonics to prevent damage to the functional module of the lighting device. Therefore, the harmonic suppression module can effectively extend the service life of the lighting device and prevent the occurrence of accidents such as fires.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lighting device, particularly a lighting device having a harmonic suppression function.

Background Art

[0002] To meet the requirements of industrial production, after a large number of large devices are connected to the power grid, it has a serious impact on the quality of the power grid, leading to the generation of high-frequency harmonics, severely distorting the waveform of the power grid, and generating a serious harmonic superposition phenomenon. When high-frequency passes through the filter capacitor, it may cause the fuse to blow. At the same time, since the driver of the lighting device is also affected by high-frequency harmonics for a long time, it leads to a reduction in service life. In addition, the temperature of the capacitor rises due to high-frequency harmonics, which may also lead to accidents such as fires.

[0003] Some conventional harmonic suppression circuits usually use an inductor at the input end to achieve the harmonic suppression effect. However, such an inductor with a large volume and a high inductance value significantly increases the cost and cannot meet the requirements of radiation and conduction.

[0004] Some conventional harmonic suppression circuits can suppress harmonic interference to a certain extent by moving all the capacitors before the rectifier to after the rectifier. However, when high-frequency harmonics pass through the rectifier, the diodes of the rectifier may be destroyed due to overheating.

[0005] Also, some conventional harmonic suppression circuits use an active filter to remove harmonics, but this significantly increases the cost.

[0006] Both Chinese Patent Application Publication No. 110829809 and US Patent Application Publication No. 20100052432 disclose harmonic suppression technologies, but still cannot effectively solve the problems of the prior art.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] An object of the present invention is to provide a lighting fixture having a harmonic suppression function.

Means for Solving the Problems

[0009] Based on an embodiment of the present invention, there is provided a lighting device with a harmonic suppression function including an input module, a harmonic suppression module, a rectification module, a filter module, a voltage conversion module, and a light source module. The harmonic suppression module is connected to the input module. The rectification module is connected to the harmonic suppression module. The filter module is connected to the rectification module. The voltage conversion module is connected to the filter module. The light source module is connected to the voltage conversion module. Here, the harmonic suppression module is arranged between the input module and the rectification module. The above-mentioned harmonic suppression module is arranged in front of the rectification module and can effectively suppress high-frequency harmonics to prevent damage to the functional modules of the lighting device. Therefore, the above-mentioned harmonic suppression module can effectively extend the service life of the lighting device and prevent the occurrence of accidents such as fires.

[0010] As an improvement of the present invention, the inductance value of the inductor is 1000 nH to 1 mH.

[0011] As an improvement of the present invention, the input module includes a live wire terminal and a neutral wire terminal.

[0012] As an improvement of the present invention, the input module is connected to an external power source.

[0013] As an improvement of the present invention, the light source module is a light emitting diode, a light emitting diode array or other similar members.

[0014] As an improvement of the present invention, the harmonic suppression module is connected to the input module via a fuse.

[0015] As an improvement of the present invention, the harmonic suppression module includes an inductor, a capacitor and a thermistor. One end of the inductor is connected to the live wire terminal, and the other end of the inductor is connected to the first node. The first node is connected to one end of the capacitor and the rectification module. The other end of the capacitor is connected to one end of the thermistor, and the other end of the thermistor is connected to the second node. The second node is connected to the neutral wire terminal and the rectification module.

[0016] As an improvement of the present invention, the rectification module has a first terminal, a second terminal, a third terminal and a fourth terminal. The first terminal is connected to the first node, the second terminal is connected to the second node, the third terminal is connected to the filter module, and the fourth terminal is connected to the ground.

[0017] As an improvement of the present invention, the voltage conversion module is a boost converter, a buck converter, a boost / buck converter or a flyback converter.

[0018] As an improvement of the present invention, the voltage conversion module is a combination of any two or more of a boost converter, a buck converter, a boost / buck converter and a flyback converter.

Advantages of the Invention

[0019] Based on the above, the lighting fixture with a harmonic suppression function according to the embodiment of the present invention can have one or more of the following advantages. (1) The lighting device includes an input module, a harmonic suppression module, a rectification module, a filter module, a voltage conversion module, and a light source module. The harmonic suppression module is connected to the input module. The rectification module is connected to the harmonic suppression module. The filter module is connected to the rectification module. The voltage conversion module is connected to the filter module. The light source module is connected to the voltage conversion module. Here, the harmonic suppression module is arranged between the input module and the rectification module. The above-mentioned harmonic suppression module is arranged in front of the rectification module and can effectively suppress harmonics and prevent damage to the functional modules of the lighting device. Therefore, the above-mentioned harmonic suppression module can effectively extend the service life of the lighting device and prevent the occurrence of accidents such as fires. (2) The harmonic suppression module of the lighting device includes an inductor, a capacitor, and a thermistor. The inductor can effectively suppress high-frequency harmonics. When high-frequency harmonics pass through the inductor, they pass through the capacitor and the thermistor and return to the input module again. When severe high-frequency harmonics occur, the resistance value of the thermistor increases to consume the high-frequency harmonics. The above-mentioned automatic adjustment type harmonic suppression mechanism can effectively suppress high-frequency harmonics and prevent high-frequency harmonics from affecting the functional modules of the lighting device. Therefore, the service life of the lighting device can be further extended, and the reliability of the lighting device can be improved. (3) The inductance value of the inductor of the harmonic suppression module of the lighting device may be 1000 nH to 1 mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, so the cost can be greatly reduced, and the requirements for radiation and conduction can be met. Therefore, the application of the lighting device can be made more extensive, and the requirements of actual applications can be better met. (4) The harmonic suppression module of the lighting device can use an inductor with a low inductance value. Therefore, the inductor does not affect the efficiency of the entire lighting device and can achieve higher performance for the lighting device. In addition, the inductor can also provide an effective harmonic suppression function. Therefore, the lighting device can meet the requirements of different applications. (5) Since the light source module of the lighting device may be a light-emitting diode, the energy consumption of the lighting device can be significantly reduced, and high efficiency can be achieved at the same time. Therefore, the lighting device can be made more energy-efficient, meet the requirements of environmental protection, and conform to the trend of future development. (6) Since the circuit design of the lighting device is simple, the desired effect can be obtained while effectively reducing costs. Therefore, the lighting device can achieve higher practicality and better meet the requirements of different users.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0021] In the following embodiments, the detailed features and advantages of the present invention are described, and the content is sufficient for those skilled in the art to understand the technical content of the present invention and enable them to implement it accordingly. Moreover, based on the disclosure content, claims, and drawings of this specification, those skilled in the art can easily understand the objectives and advantages of the present invention.

[0022] Hereinafter, with reference to the related drawings, embodiments of a lighting fixture having a harmonic suppression function of the present invention will be described. However, in order to make it easier to understand and easier to explain with the drawings, each member in the drawings may be shown with exaggerated or reduced dimensions and ratios. In the following description and / or claims, when a member is described as "connected" or "coupled" to another member, it may be directly connected or coupled to the other member, or there may be an intervening member. When a member is described as "directly connected" or "directly coupled" to another member, there is no intervening member, and the same should be interpreted for other terms used to explain the relationship between members or layers. For ease of understanding, the same members in the following embodiments will be described with the same reference numerals.

[0023] FIG. 1 is a block diagram showing a circuit structure of a lighting device having a harmonic suppression function according to a first embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a harmonic suppression module 12, a rectification module 13, a filter module 14, a voltage conversion module 15, and a light source module 16.

[0024] The harmonic suppression module 12 is connected to the input module 11. The input module 11 is connected to an external power supply PS. In this embodiment, the external power supply PS is a commercial power supply. In another embodiment, the external power supply PS may be a generator or other similar member.

[0025] The rectification module 13 is connected to the harmonic suppression module 12. In this embodiment, the rectification module 13 is a bridge rectifier. In another embodiment, the rectification module 13 may be a half-wave rectifier or other similar member.

[0026] The filter module 14 is connected to the rectification module 13. In this embodiment, the filter module 14 can include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. Another implementation circuit can be designed according to actual needs and can meet the needs of different applications.

[0027] The voltage conversion module 15 is connected to the filter module 14. In this embodiment, the voltage conversion module 15 may be a boost converter, a buck converter, a buck-boost converter, a flyback converter, or other similar components. In another embodiment, the voltage conversion module 15 may be any combination of two or more of a boost converter, a buck converter, a buck-boost converter, and a flyback converter.

[0028] The light source module 16 is connected to the voltage conversion module 15. In this embodiment, the light source module 16 is a light-emitting diode (LED). In another embodiment, the light source module 16 may be an array of light-emitting diodes or other similar components.

[0029] As can be seen from the above, the harmonic suppression module 12 is arranged between the input module 11 and the rectification module 13. In this way, the above-mentioned harmonic suppression module 12 is arranged in front of the rectification module 13, and can effectively suppress high-frequency harmonics and prevent damage to the lighting device 1. Therefore, the above-mentioned harmonic suppression module 1 can effectively improve the service life of the lighting device and prevent accidents such as fires.

[0030] Furthermore, the harmonic suppression module 12 may include an inductor. The inductance value of the inductor described above may be 1 mH or less. For example, the inductance value of the inductor described above may be 1000 nH to 1 mH. Therefore, the harmonic suppression module 12 can use an inductor with a low inductance value and a small size, greatly reducing costs and meeting the requirements of radiation and conduction. Therefore, the application of the lighting device 1 can be made more extensive and meet the requirements of actual applications.

[0031] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the harmonic suppression function of this embodiment should still be included in the protection scope of the present invention.

[0032] FIG. 2 is a circuit diagram of a lighting device with a harmonic suppression function according to a second embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a harmonic suppression module 12, a rectification module 13, a filter module 14, a voltage conversion module 15, and a light source module 16.

[0033] The input module 11 includes a live terminal Lt and a neutral line terminal Nt. The live line terminal Lt and the neutral line terminal Nt are connected to an external power supply PS. In this embodiment, the external power supply PS is a commercial power supply. In another embodiment, the external power supply PS may be a generator or other similar member.

[0034] The harmonic suppression module 12 is connected to the input module 11. The harmonic suppression module 12 includes an inductor L1, a capacitor C1, and a thermistor PT. One end of the inductor L1 is connected to the live terminal Lt, and the other end of the inductor L1 is connected to the first node N1. The first node N1 is connected to one end of the capacitor C1. The other end of the capacitor C1 is connected to one end of the thermistor PT, and the other end of the thermistor PT is connected to the second node N2. The second node N2 is connected to the neutral wire terminal Nt. The thermistor PT may be a positive temperature coefficient thermistor or other member whose resistance increases as the temperature rises. The capacitance value of the capacitor C1 can be adjusted according to the power of the light source module 16, and the capacitance value (nF) of the capacitor C1 may be about 10 times the power (W) of the light source module 16. For example, when the power of the light source module 16 is 10 W, the capacitance value of the capacitor C1 may be about 100 nF. When the power of the light source module 16 is 20 W, the capacitance value of the capacitor C1 may be about 220 nF or less. When the power of the light source module 16 is 50 W, the capacitance value of the capacitor C1 may be about 470 nF or less.

[0035] The rectification module 13 may be a bridge rectifier. The rectification module 13 has a first terminal E1, a second terminal E2, a third terminal E3, and a fourth terminal E4. The first terminal E1 of the rectification module 13 is connected to the first node N1, the second terminal E2 of the rectification module 13 is connected to the second node N2, the third terminal E3 of the rectification module 13 is connected to the filter module 14. The fourth terminal N4 of the rectification module 13 is connected to the ground GND.

[0036] The filter module 14 is connected to the rectification module 13. In this embodiment, the filter module 14 can include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. In another embodiment, the filter module 14 may have only a filter circuit. The circuit of the filter module 14 can be designed according to actual needs to meet the requirements of different applications.

[0037] The voltage conversion module 15 is connected to the filter module 14. In this embodiment, the voltage conversion module 15 may be a boost converter. In another embodiment, the voltage conversion module 15 may be a buck converter, a buck - boost converter, a flyback converter, or other similar components. In yet another embodiment, the voltage conversion module 15 may be any combination of two or more of a boost converter, a buck converter, a buck - boost converter, and a flyback converter.

[0038] The light source module 16 is connected to the voltage conversion module 15. In this embodiment, the light source module 16 may be a light - emitting diode. In another embodiment, the light source module 16 may be a light - emitting diode array or other similar components.

[0039] As can be seen from the above, the harmonic suppression module 12 is arranged between the input module 11 and the rectification module 13. The harmonic suppression module 12 has a special harmonic suppression circuit design including an inductor L1, a capacitor C1, and a thermistor PT.

[0040] The inductance value of the above inductor may be 1 mH or less. For example, the inductance value of the above inductor L1 may be 1000 nH to 1 mH. Inductor L1 has an inrush current suppression function that prevents damage to the functional modules of the lighting device 1 due to inrush current. Also, since inductor L1 also has the characteristic of suppressing rapid changes in current, it can suppress harmonics, and the higher the frequency of the harmonics, the higher the harmonic suppression function of inductor L1. Further, the harmonic suppression module 12 can use inductor L1 with a low inductance value and a small size, greatly reducing costs and meeting the requirements of radiation and conduction. Therefore, the application of the lighting device 1 can be made wider, and the requirements of actual applications can be met. Furthermore, since the above inductor L1 does not affect the efficiency of the entire lighting device 1, higher performance can be achieved by the lighting device 1. Also, the above inductor L1 can also provide an efficient harmonic suppression function. Therefore, the lighting device 1 can meet the requirements of different applications.

[0041] Also, due to the characteristics of capacitor C1 itself, direct current cannot pass through capacitor C1, but alternating current can pass through capacitor C1. Therefore, high-frequency harmonics return to the neutral line terminal Nt (return to the external power supply PS) through capacitor C1.

[0042] When severe high-frequency harmonics occur, the resistance value of the thermistor PT increases and consumes the high-frequency harmonics. Therefore, the harmonic suppression module 12 can achieve an automatic adjustment type harmonic suppression mechanism, effectively suppressing high-frequency harmonics and preventing the high-frequency harmonics from affecting the functional modules of the lighting device. With the above circuit design, the service life of the lighting device 1 can be further extended, and the reliability of the lighting device 1 can be improved.

[0043] Since the light source module 16 of the lighting device 1 may be a light-emitting diode, the energy consumption of the lighting device 1 can be significantly reduced, and at the same time, high efficiency can be achieved. Therefore, the lighting device 1 is more energy-saving, meets the requirements of environmental protection, and can adapt the lighting device 1 to the trend of future development.

[0044] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the harmonic suppression function of this embodiment should still be included in the protection scope of the present invention.

[0045] Note that some conventional harmonic suppression circuits usually use an inductor at the input end to achieve the harmonic suppression effect. However, such an inductor with a large volume and a high inductance value significantly increases the cost and cannot meet the requirements of radiation and conduction. Some conventional harmonic suppression circuits can suppress harmonic interference to a certain extent by moving all the capacitors before the rectifier to behind the rectifier. However, when high-frequency harmonics pass through the rectifier, the diodes of the rectifier may be destroyed due to overheating. Also, some conventional harmonic suppression circuits use active filters to remove harmonics, but this significantly increases the cost. In contrast, based on the first and second embodiments of the present invention, the lighting device includes an input module, a harmonic suppression module, a rectification module, a filter module, a voltage conversion module, and a light source module. The harmonic suppression module is connected to the input module. The rectification module is connected to the harmonic suppression module. The filter module is connected to the rectification module. The voltage conversion module is connected to the filter module. The light source module is connected to the voltage conversion module. Here, the harmonic suppression module is arranged between the input module and the rectification module. The above-mentioned harmonic suppression module is arranged before the rectification module and can effectively suppress harmonics to prevent damage to the functional modules of the lighting device. Therefore, the above-mentioned harmonic suppression module can effectively extend the service life of the lighting device and prevent the occurrence of accidents such as fires.

[0046] Based on the first and second embodiments of the present invention, the harmonic suppression module of the lighting device includes an inductor, a capacitor, and a thermistor. The inductor can effectively suppress high-frequency harmonics. When high-frequency harmonics pass through the inductor, they pass through the capacitor and the thermistor and then return to the input module again. When severe high-frequency harmonics occur, the resistance value of the thermistor increases to consume the high-frequency harmonics. The above automatic adjustment type harmonic suppression mechanism can effectively suppress high-frequency harmonics and prevent the high-frequency harmonics from affecting the functional module of the lighting device. Therefore, the service life of the lighting device can be further extended, and the reliability of the lighting device can be improved.

[0047] Also, based on the first and second embodiments of the present invention, based on the first and second embodiments of the present invention, the inductance value of the inductor of the harmonic suppression module of the lighting device may be 1000 nH to 1 mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, so that the cost can be greatly reduced, and the requirements of radiation and conduction can be met. Therefore, the application of the lighting device can be made more extensive, and the requirements of actual applications can be better met.

[0048] Also, based on the first and second embodiments of the present invention, the harmonic suppression module of the lighting device can use an inductor with a low inductance value. Therefore, the above inductor does not affect the efficiency of the entire lighting device, and the lighting device can achieve higher performance. Also, the above inductor can also provide an effective harmonic suppression function. Therefore, the lighting device can meet the requirements of different applications.

[0049] Also, based on the first and second embodiments of the present invention, the light source module of the lighting device may be a light-emitting diode, so that the energy consumption of the lighting device can be greatly reduced, and at the same time, high efficiency can be achieved. Therefore, the lighting device can be made more energy-efficient, meet the requirements of environmental protection, and adapt the lighting device to the trend of future development.

[0050] Furthermore, based on the first and second embodiments of the present invention, since the circuit design of the lighting device is simple, the desired effect can be obtained while effectively reducing costs. Therefore, the lighting device can achieve higher practicality and better meet the requirements of different users. From the above, it can be seen that the lighting device with a harmonic suppression function based on the embodiment of the present invention can surely achieve excellent technical effects.

[0051] FIG. 3 is a circuit diagram of a lighting device with a harmonic suppression function according to the third embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a harmonic suppression module 12, a rectification module 13, a filter module 14, a voltage conversion module 15, and a light source module 16.

[0052] The input module 11 includes a live terminal Lt and a neutral line terminal Nt. The live line terminal Lt and the neutral line terminal Nt are connected to an external power source PS. In this embodiment, the external power source PS is a commercial power source. In another embodiment, the external power source PS may be a generator or other similar member.

[0053] The harmonic suppression module 12 is connected to the input module 11. The harmonic suppression module 12 includes an inductor L1, a capacitor C1, and a thermistor PT. One end of the inductor L1 is connected to the live terminal Lt, and the other end of the inductor L1 is connected to the first node N1. The first node N1 is connected to one end of the capacitor C1. The other end of the capacitor C1 is connected to one end of the thermistor PT, and the other end of the thermistor PT is connected to the second node N2. The second node N2 is connected to the neutral wire terminal Nt. The thermistor PT may be a positive temperature coefficient thermistor or other member whose resistance increases as the temperature rises. The capacitance value of the capacitor C1 can be adjusted according to the power of the light source module 16, and the capacitance value (nF) of the capacitor C1 may be about 10 times the power (W) of the light source module 16. For example, when the power of the light source module 16 is 10W, the capacitance value of the capacitor C1 may be about 100nF. When the power of the light source module 16 is 20W, the capacitance value of the capacitor C1 may be about 220nF or less. When the power of the light source module 16 is 50W, the capacitance value of the capacitor C1 may be about 470nF or less.

[0054] The rectification module 13 may be a bridge rectifier. The rectification module 13 has a first terminal E1, a second terminal E2, a third terminal E3, and a fourth terminal E4. The first terminal E1 of the rectification module 13 is connected to the first node N1, the second terminal E2 of the rectification module 13 is connected to the second node N2, the third terminal E3 of the rectification module 13 is connected to the filter module 14, and the fourth terminal N4 of the rectification module 13 is connected to the ground GND.

[0055] The filter module 14 is connected to the rectification module 13. In this embodiment, the filter module 14 can include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. In another embodiment, the filter module 14 may have only a filter circuit. The circuit of the filter module 14 can be designed according to actual needs to meet the requirements of different applications.

[0056] The voltage conversion module 15 is connected to the filter module 14. In this embodiment, the voltage conversion module 15 may be a boost converter. In another embodiment, the voltage conversion module 15 may be a buck converter, a buck-boost converter, a flyback converter, or other similar components. In yet another embodiment, the voltage conversion module 15 may be any combination of two or more of a boost converter, a buck converter, a buck-boost converter, and a flyback converter.

[0057] The light source module 16 is connected to the voltage conversion module 15. In this embodiment, the light source module 16 may be a light emitting diode. In another embodiment, the light source module 16 may be a light emitting diode array or other similar components.

[0058] Since each of the above components is the same as in the previous embodiment, detailed description thereof is omitted here. The difference from the previous embodiment is that the lighting device 1 of this embodiment further includes a fuse Fs. The harmonic suppression module 12 is connected to the input module 11 via the fuse Fs (one end of the inductor L1 of the harmonic suppression module 12 is connected to the live terminal Lt of the input module 11).

[0059] Similarly, the lighting device 1 includes an input module 11, a harmonic suppression module 12, a rectification module 13, a filter module 14, a voltage conversion module 15, and a light source module 16. The harmonic suppression module 12 is connected to the input module 11. The rectification module 13 is connected to the harmonic suppression module 12. The filter module 14 is connected to the rectification module 13. The voltage conversion module 15 is connected to the filter module 14. The light source module 16 is connected to the voltage conversion module 15. Here, the harmonic suppression module 12 is disposed between the input module 11 and the rectification module 13. The above-described harmonic suppression module 12 is disposed in front of the rectification module 13 and can effectively suppress harmonics and prevent damage to the functional modules of the lighting device 1. Therefore, the above-described harmonic suppression module 12 can effectively extend the service life of the lighting device 1 and prevent the occurrence of accidents such as fires.

[0060] Also, the harmonic suppression module 12 of the lighting device 1 includes an inductor L1, a capacitor C1, and a thermistor PT. The above-described inductor L1 can effectively suppress high-frequency harmonics. When the high-frequency harmonics pass through the inductor L1, they pass through the capacitor C1 and the thermistor PT and return to the input module 11 again. When severe high-frequency harmonics occur, the resistance value of the thermistor PT increases and consumes the high-frequency harmonics. By the above-described automatic adjustment type harmonic suppression mechanism, high-frequency harmonics can be effectively suppressed, and it can be prevented that the high-frequency harmonics affect the functional modules of the lighting device 1. Therefore, the service life of the lighting device 1 can be further extended, and the reliability of the lighting device 1 can be enhanced.

[0061] Of course, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device having the harmonic suppression function of this embodiment should still be included in the protection scope of the present invention.

[0062] In summary, based on the first, second, and third embodiments of the present invention, the lighting device includes an input module, a harmonic suppression module, a rectification module, a filter module, a voltage conversion module, and a light source module. The harmonic suppression module is connected to the input module. The rectification module is connected to the harmonic suppression module. The filter module is connected to the rectification module. The voltage conversion module is connected to the filter module. The light source module is connected to the voltage conversion module. Here, the harmonic suppression module is arranged between the input module and the rectification module. The above-mentioned harmonic suppression module is arranged in front of the rectification module and can effectively suppress harmonics to prevent damage to the functional modules of the lighting device. Therefore, the above-mentioned harmonic suppression module can effectively extend the service life of the lighting device and prevent accidents such as fires from occurring.

[0063] Based on the first, second, and third embodiments of the present invention, the harmonic suppression module of the lighting device includes an inductor, a capacitor, and a thermistor. The inductor can effectively suppress high-frequency harmonics. When high-frequency harmonics pass through the inductor, they pass through the capacitor and the thermistor and return to the input module again. When severe high-frequency harmonics occur, the resistance value of the thermistor increases to consume the high-frequency harmonics. The above-mentioned automatic adjustment type harmonic suppression mechanism can effectively suppress high-frequency harmonics and prevent the high-frequency harmonics from affecting the functional modules of the lighting device. Therefore, the service life of the lighting device can be further extended, and the reliability of the lighting device can be improved.

[0064] Also, based on the first, second, and third embodiments of the present invention, and based on the first and second embodiments of the present invention, the inductance value of the inductor of the harmonic suppression module of the lighting device may be 1000 nH to 1 mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, thus significantly reducing costs and meeting the requirements of radiation and conduction. Therefore, the application of the lighting device can be extended to a wider range, and the requirements of actual applications can be better met.

[0065] Also, based on the first, second, and third embodiments of the present invention, the harmonic suppression module of the lighting device can use an inductor with a low inductance value. Therefore, the above inductor does not affect the efficiency of the entire lighting device, and the lighting device can achieve higher performance. Also, the above inductor can provide an effective harmonic suppression function. Therefore, the lighting device can meet the requirements of different applications.

[0066] Also, based on the first, second, and third embodiments of the present invention, the light source module of the lighting device may be a light-emitting diode, so the energy consumption of the lighting device can be significantly reduced, and high efficiency can be achieved at the same time. Therefore, the lighting device can be made more energy-efficient, meet the requirements of environmental protection, and conform to the trend of future development.

[0067] Furthermore, based on the first, second, and third embodiments of the present invention, since the circuit design of the lighting device is simple, the desired effect can be obtained while effectively reducing costs. Therefore, the lighting device can achieve higher practicality and better meet the requirements of different users.

[0068] Although each of the above embodiments has been described in this specification, it should be noted that it does not limit the scope of the claims of the present invention. Therefore, any changes and modifications to the embodiments described in this specification based on the innovative concept of the present invention, or substitutions of equivalent structures or equivalent processes made using the content 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 included in the scope of the claims of the present invention.

Explanation of Reference Signs

[0069] 1 Lighting device 11 Input module 12 Harmonic suppression module 13 Rectification module 14 Filter module 15 Voltage conversion module 16 Light source module PS External power supply Lt Live wire terminal Nt Neutral wire terminal L1 Inductor C1 Capacitor PT Thermistor E1 First terminal E2 Second terminal E3 Third terminal E4 Fourth terminal N1 First node N2 Second node Fs Fuse GND Ground

Claims

1. An input module; a harmonic suppression module connected to the input module and including an inductor, a capacitor, and a thermistor; a rectification module connected to the harmonic suppression module; a filter module connected to the rectifier module; a voltage conversion module connected to the filter module; a light source module connected to the voltage conversion module; Equipped with A lighting device with a harmonic suppression function, characterized in that the harmonic suppression module is disposed between the input module and the rectification module.

2. 2. The lighting device with a harmonic suppression function according to claim 1, wherein an inductance value of the inductor is 1000 nH to 1 mH.

3. The lighting device with harmonic suppression function according to claim 1 , wherein the input module includes a live line terminal and a neutral line terminal.

4. The lighting device with harmonic suppression function described in claim 3, characterized in that one end of the inductor is connected to the live line terminal, the other end of the inductor is connected to a first node, the first node is connected to one end of the capacitor and the rectifier module, the other end of the capacitor is connected to one end of the thermistor, the other end of the thermistor is connected to a second node, and the second node is connected to the neutral line terminal and the rectifier module.

5. The lighting device with harmonic suppression function described in claim 4, characterized in that the rectifier module has a first terminal, a second terminal, a third terminal and a fourth terminal, the first terminal is connected to the first node, the second terminal is connected to the second node, the third terminal is connected to the filter module, and the fourth terminal is connected to ground.

6. The lighting device with harmonic suppression function according to claim 1 , wherein the input module is connected to an external power source.

7. The lighting device with harmonic suppression function according to claim 1 , wherein the light source module is a light emitting diode or a light emitting diode array.

8. 2. The lighting device with harmonic suppression function according to claim 1, wherein the harmonic suppression module is connected to the input module via a fuse.

9. 2. The lighting device with harmonic suppression function according to claim 1, wherein the voltage conversion module is a boost converter, a buck converter, a boost / buck converter, or a flyback converter.

10. The lighting device with a harmonic suppression function according to claim 1 , wherein the voltage conversion module is a combination of two or more of a step-up converter, a step-down converter, a step-up / step-down converter, and a flyback converter.

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