An external POF port lightning protection circuit and device

Abstract

This utility model relates to the field of electronic communication technology, specifically to an external POF port lightning protection circuit and device. The lightning protection circuit includes: a first varistor MOV1, one end of which is connected to the positive terminal of the power input, and the other end connected to ground; and a second varistor MOV2, one end of which is connected to the positive terminal of the power input, and the other end connected to the negative terminal of the power input. This utility model provides an external POF port lightning protection circuit and device, achieving efficient lightning protection through the combination of the first varistor MOV1, the second varistor MOV2, the third varistor MOV3, and a transient voltage suppressor TVS1.

Description

Technical Field

[0001] This utility model relates to the field of electronic communication technology, specifically to an external POF port lightning protection circuit and device. Background Technology

[0002] POF (Power Over Fiber) is an innovative solution that integrates a fiber optic flange port with a power supply port. For lightning protection requirements of this port, indoor products typically have no specific level restrictions, while outdoor products must meet extremely stringent standards, such as the common lightning protection level of 1.2 / 50us 6KV, with the highest level currently reaching an impulse current of 6KA (approximately equal to 1.2 / 50us 12KV).

[0003] Some existing products may have insufficient protection levels upon shipment due to layout limitations or unclear customer requirements in the early stages. In such cases, the solution usually requires product redesign, a revised version, or a compromise by the customer to downgrade the product. Without the necessary protective functions, products may suffer large-scale damage during thunderstorms, or even cause fires, resulting in serious consequences. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing an external POF port lightning protection circuit and device to ensure the lightning protection capability of the POF port and guarantee the safe and stable operation of the product.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] On the one hand, an external POF port lightning protection circuit is provided, the lightning protection circuit comprising:

[0007] The first varistor MOV1 has one end connected to the positive terminal of the power input and the other end connected to ground.

[0008] The second varistor MOV2 has one end connected to the positive terminal of the power input terminal and the other end connected to the negative terminal of the power input terminal.

[0009] The third varistor MOV3 has one end connected to the negative terminal of the power input terminal and the other end connected to ground.

[0010] A transient voltage suppressor TVS1, one end of which is connected to the positive terminal of the power input terminal and the other end of which is connected to the negative terminal of the power input terminal;

[0011] The first varistor MOV1 and the third varistor MOV3 are used for common-mode lightning protection, the second varistor MOV2 is used for differential-mode lightning protection, and the transient voltage suppressor TVS1 is used for secondary clamping of residual overvoltage.

[0012] Furthermore, the first varistor MOV1 and the third varistor MOV3 have a varistor voltage of 90V, which is used to quickly conduct and discharge the lightning energy to the ground during a lightning strike.

[0013] Furthermore, the second varistor MOV2 has a varistor voltage of 90V, which is used to quickly conduct and discharge differential mode lightning energy to the negative terminal of the power input during a lightning strike.

[0014] Furthermore, the transient voltage suppressor TVS1 has a start-up voltage of 58V, which is used to perform secondary clamping on residual overvoltage to ensure that the operating voltage at the device end is within a safe range.

[0015] Furthermore, the power input terminal adopts a 54V DC input, which is transmitted to the outdoor equipment after transmission via an optical fiber composite cable.

[0016] Furthermore, the lightning protection circuit is reliably grounded via a fastening screw to ensure that lightning energy can be effectively discharged to the ground.

[0017] On the other hand, an external POF port lightning protection device is provided, including the external POF port lightning protection circuit as described above, wherein the lightning protection device includes:

[0018] A housing for accommodating the external POF port lightning protection circuit;

[0019] A grounding terminal is provided on the housing and is reliably grounded by fastening screws;

[0020] A power input interface is provided on the housing and is used to connect a power input terminal;

[0021] An optical fiber input interface is provided on the housing and is used to connect an optical fiber input end.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides an external POF port lightning protection circuit and device. By employing a combination of a first varistor MOV1, a second varistor MOV2, a third varistor MOV3, and a transient voltage suppressor TVS1, efficient lightning protection is achieved. Specifically, this circuit design allows customers to freely decide whether to use this protection module and allows for standalone installation where needed, without requiring it to be included in the initial design requirements. This ensures it is readily available when needed, improving flexibility and convenience. Furthermore, this invention is a standalone design and does not require integration into the product design itself, thus eliminating the need for changes or maintenance to the product design and reducing maintenance costs. Through the protection against common-mode lightning strikes by the first varistor MOV1 and the third varistor MOV3, and the protection against differential-mode lightning strikes by the second varistor MOV2, combined with the secondary clamping of residual overvoltage by the transient voltage suppressor TVS1, the safe operating voltage range of the equipment is ensured, effectively protecting the product from over-current stress (EOS) damage. Attached Figure Description

[0024] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0026] 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 the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] The present invention provides the following preferred embodiments:

[0030] To address the shortcomings of POF (Power Over Fiber) ports in lightning protection, this embodiment further optimizes the design of the lightning protection circuit for the external POF port. Specifically, by employing a combination of a first varistor MOV1, a second varistor MOV2, a third varistor MOV3, and a transient voltage suppressor TVS1, highly efficient lightning protection is achieved. This design not only improves protection capabilities but also simplifies installation and maintenance, enhancing the system's reliability and stability.

[0031] In this embodiment, one end of the first varistor MOV1 is connected to the positive terminal of the power input, and the other end is connected to ground; one end of the third varistor MOV3 is connected to the negative terminal of the power input, and the other end is connected to ground. This arrangement ensures that common-mode lightning strike energy can be quickly conducted and discharged to ground, thereby effectively protecting the equipment from lightning damage.

[0032] Furthermore, the varistor voltages of the first varistor MOV1 and the third varistor MOV3 are selected to be 90V. This selection is based on precise calculations and experimental verification of protection requirements for common lightning surge currents, such as 6KA. It is important to understand that a 90V varistor voltage allows for a rapid response during a lightning strike, ensuring that the lightning energy is discharged in a timely manner, thereby protecting the equipment from damage.

[0033] In this embodiment, one end of the second varistor MOV2 is connected to the positive terminal of the power input, and the other end is connected to the negative terminal of the power input. This arrangement ensures that differential-mode lightning strike energy can be quickly conducted and discharged to the negative terminal of the power input, thereby effectively protecting the equipment from lightning damage.

[0034] Furthermore, the varistor voltage of the second varistor MOV2 is also chosen to be 90V. This choice is also based on precise calculations and experimental verification of protection requirements for common lightning surge currents, such as 6KA. Understandably, a 90V varistor voltage can respond rapidly in the event of a lightning strike, ensuring that the lightning energy can be discharged in a timely manner, thereby protecting the equipment from damage.

[0035] In this embodiment, one end of the transient voltage suppressor TVS1 is connected to the positive terminal of the power input, and the other end is connected to the negative terminal of the power input. This arrangement ensures that residual overvoltages can be clamped in a secondary manner, thereby ensuring that the operating voltage at the device end is within a safe range.

[0036] Furthermore, the start-up voltage of the transient voltage suppressor TVS1 is selected to be 58V. This selection is based on precise calculations and experimental verification of the protection requirements for residual overvoltage. It is important to understand that a 58V start-up voltage enables a rapid response when residual overvoltage occurs, ensuring that the operating voltage at the device end remains within a safe range, thereby preventing damage to the device from overvoltage stress (EOS).

[0037] In this embodiment, the connections between the first varistor MOV1, the second varistor MOV2, the third varistor MOV3, and the transient voltage suppressor TVS1 are carefully designed to ensure optimal lightning protection in practical applications. Specifically, the first varistor MOV1 and the third varistor MOV3 are connected to the positive and negative terminals of the power input, respectively, and are connected to ground via a ground wire, forming a common-mode lightning protection path. The second varistor MOV2 is connected to both the positive and negative terminals of the power input, forming a differential-mode lightning protection path. The transient voltage suppressor TVS1 is connected to both the positive and negative terminals of the power input, forming a secondary clamping path for residual overvoltage.

[0038] Furthermore, the circuit's two-terminal impedance is close to 50Ω, making it compatible with most POF ports. This not only improves circuit compatibility but also ensures efficient signal transmission and stable output power. It's important to understand that impedance matching is particularly crucial for high-power RF equipment, as good impedance matching significantly reduces hotspots caused by reflections and power losses associated with voltage standing wave ratio (VSWR), thus protecting transmission lines and equipment from damage.

[0039] In this embodiment, the circuit structure is simple, easy to implement, and suitable for mass production and application. This design not only improves the reliability and adaptability of the circuit but also reduces production costs, making it more economical. Furthermore, this circuit is suitable for outdoor equipment, effectively suppressing lightning surge currents and improving the overall system performance and signal quality.

[0040] Furthermore, this embodiment can also consider adding some additional features, such as introducing a temperature compensation circuit, to ensure the stability and reliability of the circuit under different ambient temperatures. The temperature compensation circuit can be implemented using a temperature sensor and an adjustable resistor, automatically adjusting the circuit parameters according to changes in ambient temperature, thereby maintaining the circuit's optimal operating state. It is understood that the introduction of a temperature compensation circuit will further improve the stability and reliability of the circuit, enabling it to maintain good performance in various complex environments.

[0041] Furthermore, to further improve the electromagnetic compatibility (EMC) of the circuit, an electromagnetic interference (EMI) filter can be placed between the power input terminal and the first varistor MOV1, the second varistor MOV2, and the third varistor MOV3. The EMI filter can effectively filter out electromagnetic interference at the power input terminal, further improving the stability and reliability of the circuit. It is important to understand that the introduction of the EMI filter not only improves the circuit's EMC but also further reduces the impact of external interference on the circuit, thereby improving the stability and reliability of the entire system.

[0042] The advantage of this embodiment lies in achieving highly efficient lightning protection through the combination of a first varistor MOV1, a second varistor MOV2, a third varistor MOV3, and a transient voltage suppressor TVS1. This design not only improves protection capabilities but also simplifies installation and maintenance, enhancing system reliability and stability. Customers can freely decide whether to use this protection module and can install it independently where needed, without requiring it to be included in the initial design requirements. This allows for on-demand provision later, greatly improving flexibility and convenience. Furthermore, this module is a standalone design and does not need to be integrated into the product design itself. Therefore, no changes or maintenance are required to the product design, significantly reducing maintenance costs and improving the user experience. Through the protection against common-mode lightning strikes by the first varistor MOV1 and the third varistor MOV3, and the protection against differential-mode lightning strikes by the second varistor MOV2, combined with the secondary clamping of residual overvoltage by the transient voltage suppressor TVS1, the safe operating voltage range at the equipment end is ensured, effectively protecting the product from damage caused by over-electric stress (EOS). Understandably, this utility model not only improves lightning protection capabilities but also simplifies the installation and maintenance process, enhances the reliability and stability of the system, and provides a reliable lightning protection solution for outdoor equipment.

[0043] The beneficial effects of this utility model are specifically reflected in the fact that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lightning protection circuit for an external POF port, characterized in that, The lightning protection circuit includes: The first varistor (MOV1) has one end connected to the positive terminal of the power input and the other end connected to ground. The second varistor (MOV2) has one end connected to the positive terminal of the power input terminal and the other end connected to the negative terminal of the power input terminal. The third varistor (MOV3) has one end connected to the negative terminal of the power input terminal and the other end connected to ground. A transient voltage suppressor (TVS1) is provided, with one end of the TVS1 connected to the positive terminal of the power input and the other end connected to the negative terminal of the power input. The first varistor (MOV1) and the third varistor (MOV3) are used for common-mode lightning protection, the second varistor (MOV2) is used for differential-mode lightning protection, and the transient voltage suppressor (TVS1) is used for secondary clamping of residual overvoltage.

2. The lightning protection circuit for the external POF port according to claim 1, characterized in that, The first varistor (MOV1) and the third varistor (MOV3) have a varistor voltage of 90V, which are used to quickly conduct and discharge the lightning energy to the ground during a lightning strike.

3. The lightning protection circuit for the external POF port according to claim 1, characterized in that, The second varistor (MOV2) has a varistor voltage of 90V and is used to quickly conduct and discharge differential lightning energy to the negative terminal of the power input during a lightning strike.

4. The lightning protection circuit for the external POF port according to claim 1, characterized in that, The transient voltage suppressor (TVS1) has a start-up voltage of 58V and is used to perform secondary clamping on residual overvoltage to ensure that the operating voltage at the device end is within a safe range.

5. The external POF port lightning protection circuit according to claim 1, characterized in that, The power input terminal adopts 54V DC input, which is transmitted to outdoor equipment after transmission via optical fiber composite cable.

6. The lightning protection circuit for an external POF port according to claim 5, characterized in that, The lightning protection circuit is reliably grounded through a fastening screw to ensure that lightning energy can be effectively discharged to the ground.

7. An external POF port lightning protection device, comprising the external POF port lightning protection circuit as described in any one of claims 1 to 6, characterized in that, The lightning protection device includes: A housing for accommodating the external POF port lightning protection circuit; A grounding terminal is provided on the housing and is reliably grounded by fastening screws; A power input interface is provided on the housing and is used to connect a power input terminal; An optical fiber input interface is provided on the housing and is used to connect an optical fiber input end.

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