Lighting device with harmonic rejection function

Abstract

The application discloses a lighting device with harmonic suppression function, which comprises 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 with the input module. The rectifier module is connected with the harmonic suppression module. The filter module is connected with the rectifier module. The voltage conversion module is connected with the filter module. The light source module is connected with the voltage conversion module. The harmonic suppression module is arranged between the input module and the rectifier module. The harmonic suppression module is arranged before the rectifier module, which can effectively suppress harmonics to prevent the damage of the functional modules of the lighting device. Therefore, the harmonic suppression module can effectively prolong the service life of the lighting device and prevent accidents such as fire.

Description

Technical Field

[0001] This invention relates to a lighting device, and more particularly to a lighting device with harmonic suppression function. Background Technology

[0002] To meet the demands of industrial production, numerous large pieces of equipment have been connected to the power grid, severely impacting grid quality and generating high-frequency harmonics. This causes significant waveform distortion and severe harmonic superposition. When these high-frequency harmonics pass through filter capacitors, they can cause fuses to blow. Simultaneously, the lifespan of lighting fixture drivers is reduced due to prolonged exposure to high-frequency harmonics. Furthermore, high-frequency harmonics can cause capacitor temperatures to rise, potentially leading to fires and other accidents.

[0003] Some existing harmonic suppression circuits typically use inductors at the input terminal to achieve harmonic suppression. However, such large and high-inductance inductors significantly increase costs and fail to meet radiation and conduction requirements.

[0004] Some existing harmonic suppression circuits move all capacitors from before the rectifier to after the rectifier, which can suppress harmonic interference to some extent. However, if high-frequency harmonics pass through the rectifier, it may cause the rectifier diodes to break down due to overheating.

[0005] In addition, some existing harmonic suppression circuits use active filters to eliminate harmonics, but this significantly increases costs.

[0006] Both Chinese Patent Publication CN110829809A and US Patent Publication US20100052432A1 disclose harmonic suppression technology, but they still cannot effectively solve the problems of the prior art. Summary of the Invention

[0007] According to an embodiment of the present invention, a lighting device with harmonic suppression function is provided, comprising 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. This harmonic suppression module, positioned before the rectifier module, effectively suppresses high-frequency harmonics to prevent damage to the functional modules of the lighting device. Therefore, the harmonic suppression module effectively extends the service life of the lighting device and prevents accidents such as fires.

[0008] As an improvement of the present invention, the inductance value of the inductor is between 1000nH and 1mH.

[0009] As an improvement of the present invention, the input module includes a live wire terminal and a neutral wire terminal.

[0010] As an improvement of the present invention, the input module is connected to an external power supply.

[0011] As an improvement of the present invention, the light source module is a light-emitting diode, a light-emitting diode array, or other similar components.

[0012] As an improvement of the present invention, the harmonic suppression module is connected to the input module via a fuse.

[0013] 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 a first node. The first node is connected to one end of the capacitor and a 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 wire terminal and the rectifier module.

[0014] As an improvement 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 a filter module, and the fourth terminal is connected to a ground point.

[0015] As an improvement of the present invention, the voltage conversion module is a boost converter, a buck converter, a boost / buck converter, a flyback converter, or other similar components.

[0016] As an improvement of the present invention, the voltage conversion module is any two or more of the following: boost converter, buck converter, boost / buck converter and flyback converter.

[0017] As described above, the lighting device with harmonic suppression function according to embodiments 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. The harmonic suppression module is located between the input module and the rectifier module. This harmonic suppression module, positioned before the rectifier module, effectively suppresses harmonics to prevent damage to the functional modules of the lighting device. Therefore, the harmonic suppression module effectively extends the lifespan of the lighting device and prevents accidents such as fires.

[0018] (2) The harmonic suppression module of the lighting device includes an inductor, a capacitor, and a thermistor. The inductor effectively suppresses high-frequency harmonics. When high-frequency harmonics pass through the inductor, they will return to the input module after passing through the capacitor and the thermistor. When severe high-frequency harmonics are generated, the resistance of the thermistor increases to absorb the high-frequency harmonics. This automatic adjustment harmonic suppression mechanism effectively suppresses high-frequency harmonics to prevent them from affecting the functional modules of the lighting device. Therefore, the service life of the lighting device can be further extended, enabling the lighting device to achieve higher reliability.

[0019] (3) The inductance value of the harmonic suppression module of the lighting device can be between 1000nH and 1mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, which can significantly reduce costs and meet the requirements of radiation and conduction. Therefore, the application of the lighting device can be more extensive and better meet the needs of practical applications.

[0020] (4) The harmonic suppression module of the lighting device can use an inductor with a low inductance value. Therefore, the aforementioned inductor will not affect the overall efficiency of the lighting device, enabling it to achieve higher performance. In addition, the aforementioned inductor can also provide effective harmonic suppression. Therefore, the lighting device can meet the needs of different applications.

[0021] (5) The light source module of the lighting device can be a light-emitting diode, so the energy consumption of the lighting device can be greatly reduced, while achieving high efficiency at the same time. Therefore, the lighting device can be more energy-efficient and power-saving to meet the requirements of environmental protection and make the lighting device conform to the future development trend.

[0022] (6) The circuit design of the lighting device is simple, so the desired effect can be achieved while effectively reducing costs. Therefore, the lighting device can achieve higher practicality and better meet the needs of different users. Attached Figure Description

[0023] Figure 1 This is a block diagram of the circuit structure of a lighting device with harmonic suppression function according to the first embodiment of the present invention; Figure 2 This is a circuit diagram of a lighting device with harmonic suppression function according to a second embodiment of the present invention; Figure 3 This is a circuit diagram of a lighting device with harmonic suppression function according to a third embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 1-Lighting device; 11-Input module; 12-Harmonic suppression module; 13-Rectifier 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-Grounding point.

[0025] The following detailed description of the features and advantages of the present invention is sufficient to enable anyone skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the content disclosed in this specification, the claims and drawings, anyone skilled in the art can easily understand the purpose and advantages of this creation. Detailed Implementation

[0026] The following description, with reference to the accompanying drawings, illustrates embodiments of the lighting device with harmonic suppression function according to the present invention. For clarity and ease of illustration, the dimensions and proportions of the components in the drawings may be exaggerated or reduced. In the following description and / or claims, when a component is referred to as "connected" or "coupled" to another component, it may be directly connected or coupled to that other component or there may be an intervening component; when a component is referred to as "directly connected" or "directly coupled" to another component, there is no intervening component. Other terms used to describe the relationship between components or layers should be interpreted in the same manner. For ease of understanding, the same components in the following embodiments are indicated by the same symbols.

[0027] Please see Figure 1 The figure shows a block diagram of the circuit structure of a lighting device with harmonic suppression function according to the 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 filtering module 14, a voltage conversion module 15, and a light source module 16.

[0028] Harmonic suppression module 12 is connected to input module 11. Input module 11 is connected to external power supply PS. In this embodiment, external power supply PS is AC mains power. In another embodiment, external power supply PS may be a generator or other similar component.

[0029] The rectifier module 13 is connected to the harmonic suppression module 12. In this embodiment, the rectifier module 13 is a bridge rectifier. In another embodiment, the rectifier module 13 may also be a half-wave rectifier or other similar components.

[0030] 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 have a filter circuit. The circuitry of the filter module 14 can be designed according to actual needs to meet the requirements of different applications.

[0031] 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 also be a combination of any two or more of the following: a boost converter, a buck converter, a buck-boost converter, and a flyback converter.

[0032] 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 also be a light-emitting diode array or other similar components.

[0033] As described above, the harmonic suppression module 12 is positioned between the input module 11 and the rectifier module 13. Thus, the harmonic suppression module 12, located before the rectifier module 13, effectively suppresses high-frequency harmonics, preventing damage to the functional modules of the lighting device 1. Therefore, the harmonic suppression module 1 effectively extends the lifespan of the lighting device and prevents accidents such as fires.

[0034] Furthermore, the harmonic suppression module 12 may include an inductor. The inductance value of the inductor may be below 1 mH. For example, the inductance value of the inductor may be between 1000 nH and 1 mH. Therefore, the harmonic suppression module 12 can use an inductor with a low inductance value and a small size, which can significantly reduce costs and meet the requirements of radiation and conduction. Therefore, the lighting device 1 can be used more widely and better meet the needs of practical applications.

[0035] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device with harmonic suppression function according to this embodiment should still be included within the patent scope of the invention.

[0036] Please see Figure 2 The figure shows a circuit diagram of a lighting device with harmonic suppression function according to a second embodiment of the present invention. As shown, the lighting device 1 includes an input module 11, a harmonic suppression module 12, a rectification module 13, a filtering module 14, a voltage conversion module 15, and a light source module 16.

[0037] Input module 11 includes a live wire terminal Lt and a neutral wire terminal Nt. The live wire terminal Lt and the neutral wire terminal Nt are connected to an external power supply PS. In this embodiment, the external power supply PS is AC mains power. In another embodiment, the external power supply PS may be a generator or other similar component.

[0038] Harmonic suppression module 12 is connected to input module 11. Harmonic suppression module 12 includes inductor L1, capacitor C1, and thermistor PT. One end of inductor L1 is connected to the live wire terminal Lt, and the other end of inductor L1 is connected to the first node N1. The first node N1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to one end of thermistor PT, and the other end of thermistor PT is connected to the second node N2. The second node N2 is connected to the neutral wire terminal Nt. Thermistor PT can be a positive temperature coefficient thermistor, or other components whose resistance increases with temperature. The capacitance value of capacitor C1 can be adjusted according to the power of light source module 16, and the capacitance value (nF) of capacitor C1 can be approximately 10 times the power (W) of light source module 16. For example, if the power of the light source module 16 is 10W, the capacitance value of capacitor C1 can be approximately 100nF; if the power of the light source module 16 is 20W, the capacitance value of capacitor C1 can be approximately 220nF or less; if the power of the light source module 16 is 50W, the capacitance value of capacitor C1 can be approximately 470nF or less.

[0039] The rectifier module 13 can 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 the first node N1, the second terminal E2 of the rectifier module 13 is connected to the 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 the ground point GND.

[0040] The filter module 14 is connected to the rectifier module 13. The filter module 14 may include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. In this embodiment, the filter module 14 may include a filter circuit, an EMC circuit, and other necessary circuits. In another embodiment, the filter module 14 may only have a filter circuit. The circuitry of the filter module 14 can be designed according to actual needs to meet the requirements of different applications.

[0041] 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 also be a combination of any two or more of the following: a boost converter, a buck converter, a buck-boost converter, and a flyback converter.

[0042] 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 (LED). In another embodiment, the light source module 16 may be an LED array or other similar components.

[0043] As described above, the harmonic suppression module 12 is located 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.

[0044] The inductance value of the aforementioned inductor can be below 1mH. For example, the inductance value of the aforementioned inductor L1 can be between 1000nH and 1mH. Inductor L1 has a surge current suppression function to prevent damage to the functional modules of the lighting device 1 due to surge current. In addition, inductor L1 also has the characteristic of suppressing sudden changes in current, thus suppressing harmonics; the higher the frequency of the harmonics, the better the harmonic suppression function of inductor L1. Furthermore, the harmonic suppression module 12 can use inductor L1 with a low inductance value and a small size, which can significantly reduce costs and meet the requirements of radiation and conduction. Therefore, the lighting device 1 can be used in a wider range of applications and better meet the needs of practical applications. Moreover, the aforementioned inductor L1 does not affect the overall efficiency of the lighting device 1, enabling the lighting device 1 to achieve higher performance. In addition, the aforementioned inductor L1 can also provide effective harmonic suppression. Therefore, the lighting device 1 can meet the needs of different applications.

[0045] Furthermore, due to the inherent characteristics of capacitor C1, direct current cannot pass through capacitor C1, while alternating current can. Therefore, high-frequency harmonics will return to the neutral terminal Nt (back to the external power supply PS) through capacitor C1.

[0046] When severe high-frequency harmonics are generated, the resistance of the thermistor PT increases to dissipate the high-frequency harmonics. Therefore, the harmonic suppression module 12 can achieve an automatically adjustable harmonic suppression mechanism, which can effectively suppress high-frequency harmonics to prevent them from affecting the functional modules of the lighting device. Through the above circuit design, the service life of the lighting device 1 can be further extended, enabling the lighting device 1 to achieve higher reliability.

[0047] The light source module 16 of the lighting device 1 can be a light-emitting diode, thus significantly reducing the energy consumption of the lighting device 1 while achieving high efficiency. Therefore, the lighting device 1 can be more energy-efficient, meeting environmental protection requirements and conforming to future development trends.

[0048] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device with harmonic suppression function according to this embodiment should still be included within the patent scope of the invention.

[0049] It is worth noting that some existing harmonic suppression circuits typically use inductors at the input terminal to achieve harmonic suppression. However, such large and high-inductance inductors significantly increase costs and cannot meet the requirements for radiation and conduction. Some existing harmonic suppression circuits move all capacitors before the rectifier to after the rectifier, which can suppress harmonic interference to some extent. However, if high-frequency harmonics pass through the rectifier, it may cause the rectifier diodes to break down due to overheating. In addition, some existing harmonic suppression circuits use active filters to eliminate harmonics, but this significantly increases costs. Conversely, according to the first and second embodiments of the present invention, 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. The harmonic suppression module is located between the input module and the rectifier module. The aforementioned harmonic suppression module is positioned before the rectifier module and effectively suppresses harmonics to prevent damage to the functional modules of the lighting device. Therefore, this harmonic suppression module effectively extends the lifespan of the lighting device and prevents accidents such as fires.

[0050] According to 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 effectively suppresses high-frequency harmonics. When high-frequency harmonics pass through the inductor, they pass through the capacitor and the thermistor before returning to the input module. When severe high-frequency harmonics are generated, the resistance value of the thermistor increases to dissipate the high-frequency harmonics. This automatic adjustment harmonic suppression mechanism effectively suppresses high-frequency harmonics to prevent them from affecting the functional modules of the lighting device. Therefore, the service life of the lighting device can be further extended, enabling the lighting device to achieve higher reliability.

[0051] Furthermore, according to the first and second embodiments of the present invention, the inductance value of the inductor in the harmonic suppression module of the lighting device can be between 1000nH and 1mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, which can significantly reduce costs and meet the requirements for radiation and conduction. Thus, the lighting device can be more widely used and better meets the needs of practical applications.

[0052] Furthermore, according to the first and second embodiments of the present invention, the harmonic suppression module of the lighting device can employ an inductor with a low inductance value. Therefore, the aforementioned inductor does not affect the overall efficiency of the lighting device, enabling it to achieve higher performance. Additionally, the aforementioned inductor also provides effective harmonic suppression. Therefore, the lighting device can meet the needs of various applications.

[0053] Furthermore, according to the first and second embodiments of the present invention, the light source module of the lighting device can be a light-emitting diode, thus significantly reducing the energy consumption of the lighting device while achieving high efficiency. Therefore, the lighting device can be more energy-efficient, meeting environmental protection requirements and conforming to future development trends.

[0054] Furthermore, according to the first and second embodiments of the present invention, the circuit design of the lighting device is simple, thus achieving the desired effect while effectively reducing costs. Therefore, the lighting device achieves higher practicality and better meets the needs of different users. As can be seen from the above, the lighting device with harmonic suppression function according to the embodiments of the present invention can indeed achieve excellent technical effects.

[0055] Please see Figure 3 The figure shows a circuit diagram of a lighting device with harmonic suppression function according to a third embodiment of the present invention. As shown, the lighting device 1 includes an input module 11, a harmonic suppression module 12, a rectification module 13, a filtering module 14, a voltage conversion module 15, and a light source module 16.

[0056] Input module 11 includes a live wire terminal Lt and a neutral wire terminal Nt. The live wire terminal Lt and the neutral wire terminal Nt are connected to an external power supply PS. In this embodiment, the external power supply PS is AC mains power. In another embodiment, the external power supply PS may be a generator or other similar component.

[0057] Harmonic suppression module 12 is connected to input module 11. Harmonic suppression module 12 includes inductor L1, capacitor C1, and thermistor PT. One end of inductor L1 is connected to the live wire terminal Lt, and the other end of inductor L1 is connected to the first node N1. The first node N1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to one end of thermistor PT, and the other end of thermistor PT is connected to the second node N2. The second node N2 is connected to the neutral wire terminal Nt. Thermistor PT can be a positive temperature coefficient thermistor, or other components whose resistance increases with temperature. The capacitance value of capacitor C1 can be adjusted according to the power of light source module 16, and the capacitance value (nF) of capacitor C1 can be approximately 10 times the power (W) of light source module 16. For example, if the power of the light source module 16 is 10W, the capacitance value of capacitor C1 can be approximately 100nF; if the power of the light source module 16 is 20W, the capacitance value of capacitor C1 can be approximately 220nF or less; if the power of the light source module 16 is 50W, the capacitance value of capacitor C1 can be approximately 470nF or less.

[0058] The rectifier module 13 can 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 the first node N1, the second terminal E2 of the rectifier module 13 is connected to the 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 the ground point GND.

[0059] The filter module 14 is connected to the rectifier module 13. The filter module 14 may include a filter circuit, an electromagnetic compatibility (EMC) circuit, and other necessary circuits. In this embodiment, the filter module 14 may include a filter circuit, an EMC circuit, and other necessary circuits. In another embodiment, the filter module 14 may only have a filter circuit. The circuitry of the filter module 14 can be designed according to actual needs to meet the requirements of different applications.

[0060] 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 also be a combination of any two or more of the following: a boost converter, a buck converter, a buck-boost converter, and a flyback converter.

[0061] 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 (LED). In another embodiment, the light source module 16 may be an LED array or other similar components.

[0062] The components described above are similar to those in the previous embodiments, and therefore will not be repeated here. Unlike the previous embodiments, the lighting device 1 in this embodiment also 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 wire terminal Lt of the input module 11).

[0063] 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. The harmonic suppression module 12 is located between the input module 11 and the rectifier module 13. This harmonic suppression module 12, positioned before the rectifier module 13, effectively suppresses harmonics to prevent damage to the functional modules of the lighting device 1. Therefore, the harmonic suppression module 12 effectively extends the service life of the lighting device 1 and prevents accidents such as fires.

[0064] Furthermore, the harmonic suppression module 12 of the lighting device 1 includes an inductor L1, a capacitor C1, and a thermistor PT. The inductor L1 effectively suppresses high-frequency harmonics. When high-frequency harmonics pass through the inductor L1, they pass through the capacitor C1 and the thermistor PT before returning to the input module 11. When severe high-frequency harmonics are generated, the resistance value of the thermistor PT increases to dissipate the high-frequency harmonics. This automatic adjustment harmonic suppression mechanism effectively suppresses high-frequency harmonics, preventing them from affecting the functional modules of the lighting device 1. Therefore, the service life of the lighting device 1 can be further extended, enabling it to achieve higher reliability.

[0065] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device with harmonic suppression function according to this embodiment should still be included within the patent scope of the invention.

[0066] In summary, according to the first, second, and third embodiments of the present invention, 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. The harmonic suppression module is disposed between the input module and the rectifier module. This harmonic suppression module, positioned before the rectifier module, effectively suppresses harmonics to prevent damage to the functional modules of the lighting device. Therefore, the harmonic suppression module effectively extends the service life of the lighting device and prevents accidents such as fires.

[0067] According to 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 effectively suppresses high-frequency harmonics. When high-frequency harmonics pass through the inductor, they pass through the capacitor and the thermistor before returning to the input module. When severe high-frequency harmonics are generated, the resistance value of the thermistor increases to dissipate the high-frequency harmonics. This automatic adjustment harmonic suppression mechanism effectively suppresses high-frequency harmonics to prevent them from affecting the functional modules of the lighting device. Therefore, the service life of the lighting device can be further extended, enabling the lighting device to achieve higher reliability.

[0068] 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 between 1000nH and 1mH. Therefore, the harmonic suppression module can use an inductor with a low inductance value and a small size, which can significantly reduce costs and meet the requirements for radiation and conduction. Thus, the lighting device can be more widely used and better meets the needs of practical applications.

[0069] Furthermore, according to the first, second, and third embodiments of the present invention, the harmonic suppression module of the lighting device can employ an inductor with a low inductance value. Therefore, the aforementioned inductor does not affect the overall efficiency of the lighting device, enabling it to achieve higher performance. Additionally, the aforementioned inductor also provides effective harmonic suppression. Therefore, the lighting device can meet the needs of various applications.

[0070] Furthermore, according to the first, second, and third embodiments of the present invention, the light source module of the lighting device can be a light-emitting diode (LED), thus significantly reducing the energy consumption of the lighting device while achieving high efficiency. Therefore, the lighting device can be more energy-efficient, meeting environmental protection requirements and aligning with future development trends.

[0071] Furthermore, according to the first, second, and third embodiments of the present invention, the circuit design of the lighting device is simple, thus achieving the desired effect while effectively reducing costs. Therefore, the lighting device achieves higher practicality and better meets the needs of different users.

[0072] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural or procedural transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.

Claims

1. A lighting device with harmonic suppression function, characterized in that, include: The input module includes a live wire terminal and a neutral wire terminal; A harmonic suppression module, connected to the input module, includes an inductor, a capacitor, and a thermistor; The rectifier module is connected to the harmonic suppression module; The filtering module is connected to the rectifier module; A voltage conversion module is connected to the filtering module; as well as 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. 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 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 the second node. The second node is connected to the neutral wire terminal and the rectifier module.

2. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The inductance value of the inductor is between 1000nH and 1mH.

3. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The rectifier module has a first end, a second end, a third end, and a fourth end. The first end is connected to the first node, the second end is connected to the second node, the third end is connected to the filter module, and the fourth end is connected to the ground point.

4. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The input module is connected to an external power source.

5. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The light source module is a light-emitting diode or a light-emitting diode array.

6. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The harmonic suppression module is connected to the input module via a fuse.

7. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The voltage conversion module is a boost converter, a buck converter, a boost / buck converter, or a flyback converter.

8. The lighting device with harmonic suppression function as described in claim 1, characterized in that, The voltage conversion module is a combination of any two or more of the following: boost converter, buck converter, boost / buck converter and flyback converter.

Images