Lighting fixtures 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, and more particularly to a lighting device having a harmonic suppression function. [Background technology]

[0002] To meet the demands of industrial production, a large number of large-scale devices are connected to the power grid, which has a serious impact on the quality of the power grid, causing high-frequency harmonics to be generated, severely distorting the waveform of the power grid and resulting in serious harmonic superposition. High-frequency waves passing through filter capacitors may cause fuse blowouts. At the same time, lighting device drivers are also affected by high-frequency harmonics for long periods of time, shortening their service life. High-frequency harmonics also cause capacitor temperatures to rise, potentially leading to fires and other accidents.

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

[0004] Some conventional harmonic suppression circuits can suppress harmonic interference to some extent by moving all pre-rectifier capacitors to after the rectifier, but if high-frequency harmonics pass through the rectifier, the rectifier diodes may be destroyed by overheating.

[0005] Also, some conventional harmonic suppression circuits use active filters to remove harmonics, which significantly increases costs.

[0006] Although Chinese Patent Application Publication No. 110829809 and US Patent Application Publication No. 20100052432 both disclose harmonic suppression technologies, they still cannot effectively solve the problems of the prior art. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Chinese Patent Application Publication No. 110829809 [Patent Document 2] US Patent Application Publication No. 20100052432 Summary of the Invention [Problem to be solved by the invention]

[0008] SUMMARY OF THE INVENTION An object of the present invention is to provide a lighting fixture with a harmonic suppression function. [Means for solving the problem]

[0009] According to one embodiment of the present invention, there is provided a lighting device with harmonic suppression function, which includes an input module, a harmonic suppression module, a rectifier module, a filter module, a voltage transformation 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 transformation module is connected to the filter module. The light source module is connected to the voltage transformation module. Here, the harmonic suppression module is disposed between the input module and the rectifier module. The above-mentioned harmonic suppression module is disposed before the rectifier 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 accidents such as fires.

[0010] In one refinement of the present invention, the inductor has an inductance value between 1000 nH and 1 mH.

[0011] In one refinement of the present invention, the input module includes a live wire terminal and a neutral wire terminal.

[0012] In one refinement of the invention, the input module is connected to an external power source.

[0013] In one refinement of the invention, the light source module is a light emitting diode, a light emitting diode array or other similar component.

[0014] In one refinement of the invention, the harmonic suppression module is connected to the input module via a fuse.

[0015] In one refinement 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 line terminal, and the other end of the inductor is connected to a first node. The first node is connected to one end of the capacitor and to the rectifier 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 a second node. The second node is connected to the neutral line terminal and to the rectifier module.

[0016] In one refinement of the present invention, the rectifier module has a first terminal, a second terminal, a third terminal and a fourth terminal, the first terminal is connected to a first node, the second terminal is connected to a second node, the third terminal is connected to the filter module and the fourth terminal is connected to ground.

[0017] In a refinement of the invention, the voltage conversion module is a boost converter, a buck converter, a boost / buck converter or a flyback converter.

[0018] In a refinement 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. [Effects of the Invention]

[0019] Based on the above, a lighting fixture with harmonic suppression functionality according to an embodiment of the present invention may have one or more of the following advantages. (1) The lighting device 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. Here, the harmonic suppression module is disposed between the input module and the rectifier module. The above-mentioned harmonic suppression module is disposed before the rectifier 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. (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. High-frequency harmonics pass through the inductor, then through the capacitor and thermistor, and return to the input module. When severe high-frequency harmonics occur, the resistance of the thermistor increases, causing the high-frequency harmonics to be consumed. The above-mentioned self-adjusting harmonic suppression mechanism can effectively suppress high-frequency harmonics and prevent them from affecting the functional modules of the lighting device. This can further extend the service life of the lighting device and improve the reliability of the lighting device. (3) The inductance value of the inductor in the harmonic suppression module of the lighting device can be 1000nH to 1mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and small size, which can significantly reduce costs and meet the requirements for radiation and conduction. This can broaden the application of lighting devices and better meet the requirements of actual applications. (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 overall efficiency of the lighting device, allowing the lighting device to achieve higher performance. The inductor can also provide effective harmonic suppression function, allowing the lighting device to meet the requirements of different applications. (5) The light source module of the lighting device can be a light-emitting diode, which can greatly reduce the energy consumption of the lighting device and achieve high efficiency at the same time, making the lighting device more energy-efficient, meeting the requirements of environmental protection, and enabling the lighting device to adapt to future development trends. (6) The circuit design of the lighting device is simple, which can effectively reduce costs while achieving the desired effect, thereby achieving higher practicality of the lighting device and better meeting the requirements of different users. [Brief explanation of the drawings]

[0020] [Figure 1] 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. [Figure 2] FIG. 10 is a circuit diagram of a lighting device having a harmonic suppression function according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a circuit diagram of a lighting device having a harmonic suppression function according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] In the following embodiments, 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, claims and drawings of this specification allow those skilled in the art to easily understand the objectives and advantages of the present invention.

[0022] Hereinafter, embodiments of a lighting fixture with harmonic suppression capabilities according to the present invention will be described with reference to the accompanying drawings. However, for clarity and ease of illustration in the drawings, the dimensions and proportions of each component in the drawings may be exaggerated or reduced. In the following description and / or claims, when a component is described as being "connected" or "coupled" to another component, this may be directly connected or coupled to the other component, or an intervening component may be present. When a component is described as being "directly connected" or "directly coupled" to another component, this does not mean that an intervening component is present, and other terms used to describe the relationship between components or layers should be interpreted similarly. For ease of understanding, the same components in the following embodiments will be denoted and described with the same reference numerals.

[0023] 1 is a block diagram showing the circuit structure of a lighting device with 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 rectifier 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 an input module 11. The input module 11 is connected to an external power source PS. In this embodiment, the external power source PS is a utility power source. In other embodiments, the external power source PS may be a generator or other similar component.

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

[0026] The filter module 14 is connected to the rectifier module 13. In this embodiment, the filter module 14 can include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. Different implementation circuits can be designed according to actual needs to 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 a combination of any 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 a light emitting diode array or other similar component.

[0029] As can be seen from the above, the harmonic suppression module 12 is disposed between the input module 11 and the rectifier module 13. In this way, the above-mentioned harmonic suppression module 12 is disposed before the rectifier 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 the occurrence of accidents such as fires.

[0030] Furthermore, the harmonic suppression module 12 may include an inductor. The inductance value of the inductor may be 1 mH or less. For example, the inductance value of the inductor 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, which significantly reduces costs and meets the requirements for radiation and conduction. This allows the lighting device 1 to be used in a wider range of applications and meets 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, and any equivalent modifications or variations made based on the lighting device with the harmonic suppression function of this embodiment should still fall within the protection scope of the present invention.

[0032] 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 rectifier 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 terminal Nt. The live terminal Lt and the neutral 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 component.

[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 a live lineThe inductor L1 is connected to the terminal Lt, and the other end of the inductor L1 is connected to a first node N1. The first node N1 is connected to one end of a capacitor C1. The other end of the capacitor C1 is connected to one end of a thermistor PT, and the other end of the thermistor PT is connected to a second node N2. The second node N2 is connected to the neutral line terminal Nt. The thermistor PT may be a thermistor with a positive temperature coefficient or another component 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 approximately 10 times the power (W) of the light source module 16. For example, if the power of the light source module 16 is 10 W, the capacitance value of the capacitor C1 may be approximately 100 nF. If the power of the light source module 16 is 20 W, the capacitance value of the capacitor C1 may be approximately 220 nF or less. If the power of the light source module 16 is 50 W, the capacitance value of the capacitor C1 may be approximately 470 nF or less. As shown in FIG. 2, the live line terminal Lt, the inductor L1, the first node N1, the capacitor C1, the thermistor PT, the second node N2, and the neutral line terminal Nt are connected in series.

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

[0036] The filter module 14 is connected to the rectifier module 13. In this embodiment, the filter module 14 may include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. In another embodiment, the filter module 14 may only include 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 a combination of any 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 component.

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

[0040] The inductance value of the inductor may be 1 mH or less. For example, the inductance value of the inductor L1 may be 1000 nH to 1 mH. The inductor L1 has an inrush current suppression function that prevents damage to the functional modules of the lighting device 1 due to inrush current. Furthermore, the inductor L1 also has the property of suppressing sudden current changes, thereby suppressing harmonics. The higher the harmonic frequency, the better the harmonic suppression function of the inductor L1. Furthermore, the harmonic suppression module 12 can use an inductor L1 with a low inductance value and small size, significantly reducing costs and satisfying radiation and conduction requirements. This allows the lighting device 1 to be applied more widely and meets the requirements of practical applications. Furthermore, the inductor L1 does not affect the overall efficiency of the lighting device 1, allowing the lighting device 1 to achieve high performance. The inductor L1 also provides efficient harmonic suppression. Therefore, the lighting device 1 can meet the requirements of various applications.

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

[0042] When severe high-frequency harmonics occur, the resistance of the thermistor PT increases, dissipating the high-frequency harmonics. Therefore, the harmonic suppression module 12 achieves an automatic harmonic suppression mechanism, effectively suppressing high-frequency harmonics and preventing them from affecting the functional modules of the lighting device. This circuit design further extends the service life of the lighting device 1 and improves its reliability.

[0043] The light source module 16 of the lighting device 1 may be a light-emitting diode, which can significantly reduce the energy consumption of the lighting device 1 while achieving high efficiency. Therefore, the lighting device 1 is more energy-efficient, meets environmental protection requirements, and can adapt to future development trends.

[0044] 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 made based on the lighting device with the harmonic suppression function of this embodiment should still fall within the protection scope of the present invention.

[0045] Some conventional harmonic suppression circuits typically use an inductor at the input end to achieve harmonic suppression. However, such inductors, which are large in volume and have a high inductance value, significantly increase costs and fail to meet radiation and conduction requirements. Some conventional harmonic suppression circuits can suppress harmonic interference to a certain extent by moving all capacitors before the rectifier to after the rectifier. However, if high-frequency harmonics pass through the rectifier, the rectifier diodes may be destroyed by overheating. Some conventional harmonic suppression circuits also use active filters to remove harmonics, which significantly increases costs. In contrast, according to the first and second embodiments of the present invention, a lighting device 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. Here, the harmonic suppression module is disposed between the input module and the rectifier module. The harmonic suppression module is disposed before the rectifier module, and can effectively suppress harmonics to prevent damage to the functional modules of the lighting device. Therefore, the harmonic suppression module can effectively extend the service life of the lighting device and prevent accidents such as fires.

[0046] According to the first and second embodiments of the present invention, the harmonic suppression module of a lighting device includes an inductor, a capacitor, and a thermistor. The inductor can effectively suppress high-frequency harmonics. High-frequency harmonics pass through the inductor, then pass through the capacitor and thermistor, and return to the input module. When severe high-frequency harmonics occur, the resistance of the thermistor increases, causing the high-frequency harmonics to be consumed. The above-mentioned self-adjusting harmonic suppression mechanism can effectively suppress high-frequency harmonics and prevent them from affecting the functional modules of the lighting device. This can further extend the service life of the lighting device and improve the reliability of the lighting device.

[0047] Furthermore, according to 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, which significantly reduces costs and meets the requirements for radiation and conduction. This allows the application of lighting devices to be more widespread and better meets the requirements of actual applications.

[0048] Furthermore, according to 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 inductor does not affect the overall efficiency of the lighting device, allowing the lighting device to achieve higher performance. The inductor can also provide effective harmonic suppression function. Therefore, the lighting device can meet the requirements of different applications.

[0049] Furthermore, based on the first and second embodiments of the present invention, the light source module of the lighting device can be a light-emitting diode, which can greatly reduce the energy consumption of the lighting device and achieve high efficiency at the same time, making the lighting device more energy-efficient, meeting the requirements of environmental protection, and enabling the lighting device to adapt to future development trends.

[0050] Furthermore, based on the first and second embodiments of the present invention, the circuit design of the lighting device is simple, so that the desired effect can be achieved 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 harmonic suppression function based on the embodiments of the present invention can indeed achieve excellent technical effects.

[0051] 3 is a circuit diagram of a lighting device with a harmonic suppression function according to a 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 rectifier 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 terminal Nt. The live terminal Lt and the neutral 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 component.

[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 a first node N1. The first node N1 is connected to one end of a capacitor C1. The other end of the capacitor C1 is connected to one end of a thermistor PT, and the other end of the thermistor PT is connected to a second node N2. The second node N2 is connected to the neutral line terminal Nt. The thermistor PT may be a thermistor with a positive temperature coefficient or another component whose resistance increases with increasing temperature. The capacitance value of the capacitor C1 can be adjusted according to the power of the light source module 16. The capacitance value (nF) of the capacitor C1 may be approximately 10 times the power (W) of the light source module 16. For example, if the power of the light source module 16 is 10 W, the capacitance value of the capacitor C1 may be approximately 100 nF. When the power of the light source module 16 is 20 W, the capacitance value of the capacitor C1 may be approximately 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 approximately 470 nF or less.

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

[0055] The filter module 14 is connected to the rectifier module 13. In this embodiment, the filter module 14 may include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. In another embodiment, the filter module 14 may only include 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 a combination of any 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 component.

[0058] The above components are the same as those in the previous embodiment, and detailed description thereof will be omitted here. The lighting device 1 of this embodiment differs from the previous embodiment in that it 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 rectifier 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 rectifier module 13 is connected to the harmonic suppression module 12. The filter module 14 is connected to the rectifier 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 rectifier module 13. The harmonic suppression module 12 is disposed before the rectifier module 13 and can effectively suppress harmonics to prevent damage to the functional modules of the lighting device 1. Therefore, the harmonic suppression module 12 can effectively extend the service life of the lighting device 1 and prevent accidents such as fires.

[0060] The harmonic suppression module 12 of the lighting device 1 also includes an inductor L1, a capacitor C1, and a thermistor PT. The inductor L1 effectively suppresses high-frequency harmonics. High-frequency harmonics pass through the inductor L1, capacitor C1, and thermistor PT before returning to the input module 11. When severe high-frequency harmonics occur, the resistance of the thermistor PT increases, dissipating the high-frequency harmonics. The self-adjusting harmonic suppression mechanism effectively suppresses high-frequency harmonics and prevents them from affecting the functional modules of the lighting device 1. This further extends the service life of the lighting device 1 and improves its reliability.

[0061] 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 made based on the lighting device with the harmonic suppression function of this embodiment should still fall within the protection scope of the present invention.

[0062] In summary, based on the first, second, and third embodiments of the present invention, a lighting device 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. Here, the harmonic suppression module is disposed between the input module and the rectifier module. The above-mentioned harmonic suppression module is disposed before the rectifier 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.

[0063] According to the first, second, and third embodiments of the present invention, the harmonic suppression module of a lighting device includes an inductor, a capacitor, and a thermistor. The inductor can effectively suppress high-frequency harmonics. High-frequency harmonics pass through the inductor, then pass through the capacitor and thermistor, and return to the input module. When severe high-frequency harmonics occur, the resistance of the thermistor increases, causing the high-frequency harmonics to be consumed. The above-mentioned self-adjusting harmonic suppression mechanism can effectively suppress high-frequency harmonics and prevent them from affecting the functional modules of the lighting device. This can further extend the service life of the lighting device and improve the reliability of the lighting device.

[0064] Furthermore, according to the first, second, and third embodiments of the present invention, the inductance value of the inductor in the harmonic suppression module of the lighting device can be 1000 nH to 1 mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, which significantly reduces costs and meets the requirements for radiation and conduction. This allows the application of lighting devices to be more widespread and better meets the requirements of actual applications.

[0065] Furthermore, according to 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 inductor does not affect the overall efficiency of the lighting device, allowing the lighting device to achieve higher performance. The inductor can also provide effective harmonic suppression. Therefore, the lighting device can meet the requirements of different applications.

[0066] Furthermore, based on the first, second and third embodiments of the present invention, the light source module of the lighting device can be a light-emitting diode, which can greatly reduce the energy consumption of the lighting device and achieve high efficiency at the same time, making the lighting device more energy-efficient, meeting the requirements of environmental protection, and enabling the lighting device to adapt to future development trends.

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

[0068] Although the above embodiments are described in this specification, it should be noted that they do 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 the replacement of equivalent structures or equivalent processes made using the contents of the specification and drawings of the present invention, or the direct or indirect application of the above technical solutions to other related technical fields, are all within the scope of the claims of the present invention. [Explanation of symbols]

[0069] 1. Lighting equipment 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 Line Terminal Nt Neutral wire terminal L1 inductor C1 capacitor PT thermistor E1 Terminal 1 E2 Second terminal E3 3rd terminal E4 4th 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 rectification module; a voltage conversion module connected to the filter module; a light source module connected to the voltage conversion module; Equipped with the harmonic suppression module is disposed between the input module and the rectification module; the input module includes a live line terminal and a neutral line terminal; 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, the second node is connected to the neutral line terminal and the rectifier module; the live line terminal, the inductor, the first node, the capacitor, the thermistor, the second node, and the neutral line terminal are connected in series; A lighting device having a harmonic suppression function characterized by:

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

3. 2. The lighting device with harmonic suppression function described in claim 1, 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.

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

5. 2. 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.

6. 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.

7. 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.

8. 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 boost converter, a buck converter, a boost / buck converter, and a flyback converter.

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