Low-voltage lightning surge protection circuit, lamp and electronic equipment

Abstract

The utility model belongs to the technical field of electric power, and provides a low-voltage lightning-protection surge circuit, a lamp and electronic equipment, the low-voltage lightning-protection surge circuit is formed on a circuit substrate, the circuit substrate is located in the electronic equipment, a first voltage clamping module limits the voltage input by a power supply input end within a preset safety range, and a second voltage clamping module limits the voltage input by the power supply input end within the preset safety range. The first surge absorption module absorbs surge voltage output by the first voltage clamping module, the inductance module is connected between the first surge absorption module and the second surge absorption module, and the second surge absorption module absorbs surge voltage output by the inductance module. And the second voltage clamping module is connected between the power supply output end and the conductive shell of the electronic equipment, and surge current output by the power supply output end is grounded through the conductive shell, so that a functional circuit in the electronic equipment is protected through a multi-stage surge protection design, and the problem of incomplete protection of low-voltage electric equipment is solved.

Description

Technical Field

[0001] This application belongs to the field of power technology, and in particular relates to a low-voltage surge protection circuit, lighting fixtures and electronic equipment. Background Technology

[0002] With economic and technological development, the variety of household appliances is increasing, and their popularity is becoming more widespread. Ensuring the safety of household appliances during use has become a problem that needs to be addressed in daily life.

[0003] Currently, low-voltage electrical appliances in furniture and appliances are generally not designed with lightning surge protection. However, for household appliances, there are many reasons for customer complaints, repairs, and returns due to lightning surge issues, causing significant economic and reputational losses to companies. Utility Model Content

[0004] The inventors of this application recognize that current furniture and appliances lack comprehensive protection against lightning strikes and other hazards, posing significant safety risks. The purpose of this application is to provide a low-voltage lightning surge protection circuit, lighting fixture, and electronic equipment that can solve the problem of incomplete protection against lightning strikes and other hazards in current furniture and appliances.

[0005] A first aspect of this application provides a low-voltage surge protection circuit formed on a circuit board located within an electronic device. The low-voltage surge protection circuit includes:

[0006] The first voltage clamping module is connected to the power supply input terminal and is used to limit the voltage input to the power supply input terminal within a preset safety range.

[0007] The first surge absorption module is connected to the first voltage clamping module and is used to absorb the surge voltage output by the first voltage clamping module.

[0008] The inductor module is connected to the first surge absorption module;

[0009] The second surge absorption module is connected between the inductor module and the power supply output terminal, and is used to absorb the surge voltage output by the inductor module;

[0010] The second voltage clamping module is connected between the power supply output terminal and the conductive housing of the electronic device, and is used to ground the surge current output by the power supply output terminal through the conductive housing.

[0011] The basic concept proposed by the inventors of this application is that a first voltage clamping module limits the voltage input to the power supply input terminal to a preset safe range, a first surge absorption module absorbs the surge voltage output by the first voltage clamping module, and a multi-stage surge protection circuit is formed by the first voltage clamping module, the first surge absorption module, the inductor module, the second surge absorption module, and the second voltage clamping module. The second voltage clamping module is connected between the power supply output terminal and the conductive casing of the electronic device, and can ground the surge current of the power supply output terminal through the conductive casing. Thus, the multi-stage surge protection design protects the functional circuits inside the electronic device, solving the problem of incomplete protection in low-voltage electrical equipment.

[0012] In some embodiments, the low-voltage surge protection circuit further includes:

[0013] The first overcurrent protection module is connected between the power supply input terminal and the first voltage clamping module, and is used to shut off the input current of the power supply input terminal when the current input at the power supply input terminal is greater than a first preset threshold.

[0014] The basic concept proposed by the inventors of this application is to provide overcurrent protection for the current input to the power supply input terminal through a first overcurrent protection module, so as to avoid excessive current input to the power supply input terminal from damaging the components of the subsequent circuit and improving the protection capability of low-voltage electrical equipment.

[0015] In some embodiments, the low-voltage surge protection circuit further includes:

[0016] The second overcurrent protection module is connected between the second surge absorption module and the power supply output terminal, and is used to cut off the current output to the power supply output terminal when the current output by the second surge absorption module is greater than the second preset threshold.

[0017] The basic concept proposed by the inventors of this application is to provide overcurrent protection for the current input to the power supply input terminal through a second overcurrent protection module, so as to avoid excessive current input to the power supply input terminal from damaging the components of the subsequent circuit and improving the protection capability of low-voltage electrical equipment.

[0018] In some embodiments, the low-voltage surge protection circuit further includes:

[0019] A wire-wound resistor module is connected between the power supply input terminal and the first voltage clamping module to limit the current input to the power supply input terminal, and forms an RC filter circuit with the first surge absorption module.

[0020] The basic concept proposed by the inventors of this application is to use a wire-wound resistor module to limit the current input at the power supply input terminal, thereby preventing excessive current from damaging the components of the subsequent circuit and improving the protection capability of low-voltage electrical equipment.

[0021] In some embodiments, the inductor module, the first surge absorption module, and the second surge absorption module constitute a π-shaped filter.

[0022] The basic concept proposed by the inventors of this application is to form a π-shaped filter by using an inductor module, a first surge absorption module, and a second surge absorption module. This forms a second-stage lightning surge protection circuit. The π-shaped filter prevents voltage sudden changes, limits the magnitude of instantaneous surge current, and improves the protection capability of low-voltage electrical equipment.

[0023] In some embodiments, the first voltage clamping module includes at least one first transient voltage suppression diode, the two ends of which are respectively connected between the power supply input terminal and ground.

[0024] In some embodiments, the first surge absorption module includes at least one first electrolytic capacitor, the two ends of which are respectively connected between the power supply input terminal and ground.

[0025] In some embodiments, the inductor module includes a common-mode inductor, a first terminal of which is connected to the power supply input terminal via a first surge absorption module and a first voltage clamping module, a second terminal of which is grounded, and a third terminal of which is connected to the power supply output terminal via a second surge absorption module and a second voltage clamping module.

[0026] A second aspect of this application also provides a lighting fixture, the lighting fixture comprising: a conductive housing, a driving module, a light source module, and a low-voltage surge protection circuit as described in any of the above embodiments;

[0027] The power supply output terminal supplies power to the drive module and the light source module. The drive module is used to drive the light source module to light up. The second voltage clamping module is connected between the power supply output terminal and the conductive shell.

[0028] A third aspect of this application also provides an electronic device, the electronic device comprising: a conductive housing; and a low-voltage surge protection circuit as described in any of the preceding claims, wherein a second voltage clamping module is connected between the power supply output terminal and the conductive housing.

[0029] This application provides a low-voltage surge protection circuit, a lighting fixture, and an electronic device. The low-voltage surge protection circuit is formed on a circuit board located inside the electronic device. A first voltage clamping module limits the voltage input to the power supply input terminal to a preset safe range. A first surge absorption module absorbs the surge voltage output by the first voltage clamping module. An inductor module is connected between the first and second surge absorption modules. The second surge absorption module absorbs the surge voltage output by the inductor module. The second voltage clamping module is connected between the power supply output terminal and the conductive casing of the electronic device, grounding the surge current output from the power supply output terminal through the conductive casing. This multi-level surge protection design protects the functional circuits inside the electronic device, solving the problem of incomplete protection in low-voltage electrical equipment. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the circuit structure of a low-voltage surge protection circuit provided in one embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the circuit structure of a low-voltage surge protection circuit provided in another embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the circuit structure of a low-voltage surge protection circuit provided in another embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the circuit structure of a low-voltage surge protection circuit provided in another embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of a low-voltage surge protection circuit provided in another embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the structure of a low-voltage surge protection circuit provided in another embodiment of this application;

[0036] Figure 7 This is a schematic diagram of a lamp provided in one embodiment of this application. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means one or more, unless otherwise explicitly specified.

[0041] Currently, low-voltage electrical appliances in furniture and appliances are generally not designed with lightning surge protection. However, for household appliances, there are many reasons for customer complaints, repairs, and returns due to lightning surge issues, causing significant economic and reputational losses to companies.

[0042] To address the aforementioned technical problems, this application provides a low-voltage surge protection circuit. The low-voltage surge protection circuit is formed on a circuit board located within an electronic device. (See also...) Figure 1As shown, the low-voltage surge protection circuit includes: a first voltage clamping module 210, a first surge absorption module 220, an inductor module 300, a second surge absorption module 230, and a second voltage clamping module 240. The first voltage clamping module 210 is connected to the power supply input terminal 110 and is used to limit the voltage of the power supply input terminal 110 within a preset safe range. The first surge absorption module 220 is connected to the first voltage clamping module 210 and is used to absorb the voltage clamped by the first voltage. The surge voltage output by module 210; the inductor module 300 is connected to the first surge absorption module 220; the second surge absorption module 230 is connected between the inductor module 300 and the power supply output terminal 120, and the second surge absorption module 230 is used to absorb the surge voltage output by the inductor module 300; the second voltage clamping module 240 is connected between the power supply output terminal 120 and the conductive housing DGND of the electronic device, and the second voltage clamping module 240 is used to ground the surge current output by the power supply output terminal 120 through the conductive housing DGND.

[0043] In this embodiment, a low-voltage surge protection circuit is formed on a circuit board located inside the electronic device. A first voltage clamping module 210 limits the voltage of the power supply input terminal 110 within a preset safe range. A first surge absorption module 220 absorbs the surge voltage output by the first voltage clamping module 210. An inductor module 300 is connected between the first surge absorption module 220 and the second surge absorption module 230. The second surge absorption module 230 absorbs the surge voltage output by the inductor module 300. A second voltage clamping module 240 is connected between the power supply output terminal 120 and the conductive casing DGND of the electronic device, grounding the surge current output by the power supply output terminal 120 through the conductive casing. Thus, the multi-level surge protection design protects the functional circuits inside the electronic device, solving the problem of incomplete protection in low-voltage electrical equipment.

[0044] In some embodiments, the first voltage clamping module 210, the first surge absorption module 220, the inductor module 300, the second surge absorption module 230, and the second voltage clamping module 240 are integrated on the circuit board, which helps to reduce the size of the low-voltage surge protection circuit. The power input terminal 110 can be the power input port of the low-voltage electrical appliance. By placing the circuit board inside the power input port of the low-voltage electrical appliance, the space inside the low-voltage electrical appliance can be avoided.

[0045] In some embodiments, the conductive housing DGND of the electronic device may be an aluminum alloy housing.

[0046] In some embodiments, the electronic device may be configured such that part of its housing is a conductive housing DGND with conductive properties, while the other part of the housing is configured as an insulating housing. In the event of thunderstorms, the surge current can be grounded through the power supply output terminal 120 and the conductive housing DGND.

[0047] In some embodiments, see Figure 2 As shown, the low-voltage surge protection circuit also includes a first overcurrent protection module 251. The first overcurrent protection module 251 is connected between the power supply input terminal 110 and the first voltage clamping module 210. The first overcurrent protection module 251 is used to cut off the input current of the power supply input terminal 110 when the current input to the power supply input terminal 110 is greater than a first preset threshold.

[0048] In this embodiment, the first overcurrent protection module 251 provides overcurrent protection for the current input to the power supply input terminal 110. When the current input to the power supply input terminal 110 exceeds a first preset threshold, the input current to the power supply input terminal 110 is turned off, thereby limiting the current input to the power supply input terminal 110, preventing excessive current input to the power supply input terminal 110 from damaging the components of the subsequent circuit, improving the protection capability of low-voltage electrical equipment, and preventing damage to the circuit from lightning surge current.

[0049] In some embodiments, see Figure 3 As shown, the low-voltage surge protection circuit also includes a second overcurrent protection module 252. The second overcurrent protection module 252 is connected between the second surge absorption module 230 and the power supply output terminal 120. The second overcurrent protection module 252 is used to cut off the current output to the power supply output terminal 120 when the current output by the second surge absorption module 230 is greater than the second preset threshold.

[0050] In this embodiment, after the surge absorption module 230 absorbs the current output by the first overcurrent protection module 251, the second overcurrent protection module 252 is used again to detect the overcurrent of the current output by the second surge absorption module 230. If the current output by the second surge absorption module 230 is greater than the second preset threshold, the current output to the power supply output terminal 120 is shut off, thereby limiting the current flowing through the power supply output terminal 120, preventing the current output by the power supply output terminal 120 from being too large and causing damage to the components of the subsequent circuit, improving the protection capability of low-voltage electrical equipment, and preventing damage to the circuit by lightning surge current.

[0051] In some embodiments, see Figure 4As shown, the low-voltage surge protection circuit also includes a wire-wound resistor module 253. The wire-wound resistor module 253 is connected between the power supply input terminal 110 and the first voltage clamping module 210. The wire-wound resistor module 253 is used to limit the current input to the power supply input terminal 110 and forms an RC filter circuit with the first surge absorption module 220.

[0052] In this embodiment, the current output from the power supply input terminal 110 is limited by the wire-wound resistor module 253, thereby reducing the current input to the power supply input terminal 110. Furthermore, the voltage output from the wire-wound resistor module 253 is clamped by the first voltage clamping module 210. This prevents the current input to the power supply input terminal 110 from becoming too large during lightning strikes, and also prevents the voltage input to the power supply input terminal 110 from becoming too large, thus improving the protection capability of low-voltage electrical equipment.

[0053] In some embodiments, the inductor module 300, the first surge absorption module 220, and the second surge absorption module 230 constitute a π-shaped filter.

[0054] In this embodiment, the inductor module 300 can be a common-mode inductor, and both the first surge absorption module 220 and the second surge absorption module 230 can be common-mode inductors. A first surge absorption module 220 (e.g., an electrolytic capacitor) is connected in parallel between the two TVS diodes. The principle that the voltage across the electrolytic capacitor cannot change abruptly is used to absorb the instantaneous voltage. An inductor module 300 (e.g., a common-mode inductor) is then connected after the capacitor. The principle that the inductor current cannot change abruptly is used to limit the instantaneous surge current. A second surge absorption module 230 (e.g., an electrolytic capacitor) is then connected after the inductor module 300. In this way, the two electrolytic capacitors and the common-mode inductor form a π-shaped filter, thus forming the second-stage lightning surge protection circuit. A high-capacity transient voltage suppressor (TVS) diode is then connected after this π-shaped filter, thus forming the third-stage lightning surge protection circuit.

[0055] In some embodiments, combined with Figure 5 As shown, the first voltage clamping module 210 includes at least one first transient voltage suppression diode TVS1, and the two ends of the first transient voltage suppression diode TVS1 are respectively connected between the power supply input terminal 110 and ground.

[0056] In some embodiments, combined with Figure 5 As shown, the first surge absorption module 220 includes at least one first electrolytic capacitor C1, and the two ends of the first electrolytic capacitor C1 are respectively connected between the power supply input terminal 110 and ground.

[0057] In some embodiments, combined with Figure 5As shown, the inductor module 300 includes a common-mode inductor L1. The first end of the common-mode inductor L1 is connected to the power supply input terminal 110 via the first surge absorption module 220 and the first voltage clamping module 210. The second end of the common-mode inductor is grounded. The third end of the common-mode inductor L1 is connected to the power supply output terminal 120 via the second surge absorption module 230 and the second voltage clamping module 240.

[0058] In some embodiments, combined with Figure 5 As shown, the second surge absorption module 230 includes a second electrolytic capacitor C2. The first end of the second electrolytic capacitor C2 is connected to the third end of the common mode inductor L1, and the second end of the second electrolytic capacitor C2 is grounded.

[0059] In some embodiments, combined with Figure 5 As shown, the third terminal of the common mode inductor L1 is also provided with a third-level surge protection module 254, which can clamp the potential of the third terminal of the common mode inductor L1 within a preset voltage range.

[0060] In some embodiments, combined with Figure 5 As shown, the third-level surge protection module 254 includes a second transient voltage suppression diode TVS2, the two ends of which are connected to the third and fourth terminals of the common-mode inductor L1.

[0061] In some embodiments, combined with Figure 6 As shown, the second voltage clamping module 240 includes a third transient suppression diode TVS3 and a fourth transient suppression diode TVS4. The first end of the third transient suppression diode TVS3 is connected to the power supply output terminal 120, and the second end of the third transient suppression diode TVS3 is connected to the conductive housing DGND. The first end of the fourth transient suppression diode TVS4 is grounded, and the second end of the fourth transient suppression diode TVS4 is connected to the conductive housing DGND.

[0062] In some embodiments, combined with Figure 6 As shown, the second voltage clamping module 240 also includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The first terminals of the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are connected to the first terminal of the third transient suppression diode TVS3, and the second terminals of the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are connected to the first terminal of the fourth transient suppression diode TVS4.

[0063] This application also provides a lamp, which includes: a conductive housing, a driving module, a light source module, and a low-voltage surge protection circuit as described in any of the above embodiments; the power supply output terminal 120 supplies power to the driving module and the light source module, the driving module is used to drive the light source module to light up, and the second voltage clamping module 240 is connected between the power supply output terminal 120 and the conductive housing DGND.

[0064] In some embodiments, combined with Figure 6 As shown, the light source module includes a first light-emitting unit LED1, a second light-emitting unit LED2, a third light-emitting unit LED3, a fourth light-emitting unit LED4, a fifth light-emitting unit LED5, and a sixth light-emitting unit LED6. These units are connected in series to form a light string. The first end of the light string is connected to the power output terminal 120. The first light-emitting units LED1, LED2, LED3, LED4, LED5, and LED6 are connected in series to form a light string. 4. Each light-emitting unit in the fifth light-emitting unit LED5 and the sixth light-emitting unit LED6 includes a red light-emitting diode, a green light-emitting diode, a blue light-emitting diode, and a white light-emitting diode. The first, second, and third pins of the second end of the light string are connected to the second pin R, the third pin G, and the fourth pin B of the first connecting pin J1 via the first resistor R1, the second resistor R2, and the third resistor R3, respectively. The fourth pin of the second end of the light string is connected to the fifth pin W of the first connecting pin. The first pin VCC of the first connecting pin is used to connect to the power supply output terminal 120, and the fifth pin of the first connecting pin is grounded.

[0065] In some embodiments, a first overcurrent protection module 251 is added to the power supply input terminal 110 of the lighting fixture. This ensures that the surge current under normal lightning strike conditions is continuous, but under abnormal conditions, the first overcurrent protection module 251 burns out, protecting the subsequent connected circuits and eliminating safety hazards. A wire-wound resistor module to limit the surge current is added after the first overcurrent protection module 251, and a high-capacity TVS diode is added after the wire-wound resistor module, thus forming a first-stage lightning surge protection circuit, thereby limiting the lightning surge voltage to remain within a certain safe range.

[0066] A first surge absorption module 220 (e.g., an electrolytic capacitor) is connected in parallel with two TVS diodes. The principle that the voltage across the electrolytic capacitor cannot change abruptly is used to absorb instantaneous voltage. An inductor module 300 (e.g., a common-mode inductor) is then connected after the capacitor. The principle that the inductor current cannot change abruptly is used to limit the instantaneous surge current. A second surge absorption module 230 (e.g., an electrolytic capacitor) is then connected after the inductor module 300. In this way, the two electrolytic capacitors and the common-mode inductor form a π-shaped filter, thus forming the second-stage lightning surge protection circuit. A high-capacity TVS diode is then connected after this π-shaped filter, thus forming the third-stage lightning surge protection circuit.

[0067] In one embodiment, combined Figure 7As shown, the low-voltage surge protection circuit 401 is disposed on the circuit board 410. The low-voltage surge protection circuit 401 supplies power to the drive module 420 and the light source module 430. The drive module 420 is used to drive the light source module 430 to light up. The second voltage clamping module 240 in the low-voltage surge protection circuit 401 is connected between its power supply output terminal 120 and the conductive shell DGND.

[0068] In one embodiment, the lamp includes an aluminum substrate as a lamp board. A high-capacity TVS diode is added between the positive and negative electrodes of the aluminum substrate lamp board and the metal shell as a second voltage clamping module 240. This allows the four-level surge protection circuit to effectively protect the downstream circuit from damage, thereby protecting the safety of the low-voltage lamp and solving the problem of incomplete protection for low-voltage lamps.

[0069] This application also provides an electronic device, which includes: a conductive housing; and a low-voltage surge protection circuit as described in any of the above embodiments, wherein a second voltage clamping module 240 is connected between the power supply output terminal 120 and the conductive housing.

[0070] In this embodiment, a low-voltage surge protection circuit is formed on a circuit board located inside the electronic device. A first voltage clamping module 210 limits the voltage of the power supply input terminal 110 within a preset safe range. A first surge absorption module 220 absorbs the surge voltage output by the first voltage clamping module 210. An inductor module 300 is connected between the first surge absorption module 220 and the second surge absorption module 230. The second surge absorption module 230 absorbs the surge voltage output by the inductor module 300. A second voltage clamping module 240 is connected between the power supply output terminal 120 and the conductive casing of the electronic device, grounding the surge current output by the power supply output terminal 120 through the conductive casing. Thus, the multi-level surge protection design protects the functional circuits inside the electronic device, solving the problem of incomplete protection in low-voltage electrical equipment.

[0071] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0073] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0074] In the embodiments provided in this application, it should be understood that the disclosed apparatus / terminal devices and methods can be implemented in other ways. For example, the apparatus / terminal device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0075] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0076] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0077] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0078] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A low-voltage surge protection circuit, characterized in that, Formed on a circuit board located within an electronic device, the low-voltage surge protection circuit includes: The first voltage clamping module (210) is connected to the power supply input terminal (110) and is used to limit the voltage input to the power supply input terminal (110) within a preset safety range; The first surge absorption module (220) is connected to the first voltage clamping module (210) and is used to absorb the surge voltage output by the first voltage clamping module (210); An inductor module (300) is connected to the first surge absorption module (220); The second surge absorption module (230) is connected between the inductor module (300) and the power supply output terminal (120) and is used to absorb the surge voltage output by the inductor module (300); The second voltage clamping module (240) is connected between the power supply output terminal (120) and the conductive housing of the electronic device, and is used to ground the surge current of the power supply output terminal (120) through the conductive housing (DGND).

2. The low-voltage surge protection circuit as described in claim 1, characterized in that, The low-voltage surge protection circuit also includes: The first overcurrent protection module (251) is connected between the power supply input terminal (110) and the first voltage clamping module (210) and is used to shut off the input current of the power supply input terminal (110) when the current input at the power supply input terminal (110) is greater than a first preset threshold.

3. The low-voltage surge protection circuit as described in claim 1, characterized in that, The low-voltage surge protection circuit also includes: The second overcurrent protection module (252) is connected between the second surge absorption module (230) and the power supply output terminal (120) and is used to shut off the current output to the power supply output terminal (120) when the current output by the second surge absorption module (230) is greater than the second preset threshold.

4. The low-voltage surge protection circuit as described in claim 1, characterized in that, The low-voltage surge protection circuit also includes: The wire-wound resistor module (253) is connected between the power supply input terminal (110) and the first voltage clamping module (210) to limit the current input to the power supply input terminal (110) and to form an RC filter circuit with the first surge absorption module (220).

5. The low-voltage surge protection circuit as described in claim 1, characterized in that, The inductor module (300), the first surge absorption module (220), and the second surge absorption module (230) constitute a π-shaped filter.

6. The low-voltage surge protection circuit as described in any one of claims 1-5, characterized in that, The first voltage clamping module (210) includes at least one first transient voltage suppression diode, the two ends of which are respectively connected between the power supply input terminal and ground.

7. The low-voltage surge protection circuit as described in any one of claims 1-5, characterized in that, The first surge absorption module (220) includes at least one first electrolytic capacitor, the two ends of which are respectively connected between the power supply input terminal and ground.

8. The low-voltage surge protection circuit as described in any one of claims 1-5, characterized in that, The inductor module (300) includes a common-mode inductor. The first end of the common-mode inductor is connected to the power supply input terminal via the first surge absorption module and the first voltage clamping module. The second end of the common-mode inductor is grounded. The third end of the common-mode inductor is connected to the power supply output terminal via the second surge absorption module and the second voltage clamping module.

9. A lamp, characterized in that, The luminaire includes: a conductive housing, a driving module, a light source module, and a low-voltage surge protection circuit as described in any one of claims 1-8; The power supply output terminal supplies power to the drive module and the light source module. The drive module is used to drive the light source module to light up. The second voltage clamping module is connected between the power supply output terminal and the conductive shell.

10. An electronic device, characterized in that, The electronic device includes: a conductive housing; and a low-voltage surge protection circuit as described in any one of claims 1-8, wherein the second voltage clamping module is connected between the power supply output terminal and the conductive housing.

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