Signal and power supply lightning protection composite circuit independent of ground wire
By designing a signal and power supply lightning protection composite circuit that does not rely on ground wire, and using components such as discharge tubes, varistors and transient voltage suppression tubes, the problem that small communication equipment is difficult to prevent lightning in the lack of grounding network environment is solved, and the goal of effective lightning protection effect and cost reduction is achieved.
Patent Information
- Application Number
- CN202421285208.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-05
AI Technical Summary
Small communication equipment is susceptible to damage to surges such as lightning when transmitting signals and power supplies. Traditional lightning protection circuits require grounding wires, making it difficult to effectively protect against lightning in an environment without a grounding network, and may cause signal interference.
A composite circuit for lightning protection of signal and power supply that does not depend on ground wire is designed, and components such as discharge tubes, varistors, transient voltage suppression tubes and resistors are used to form a multi-stage lightning protection structure through parallel and series connection to ensure the equipotential between the signal and the power supply line.
It realizes effective lightning protection without grounding network, reduces application costs, expands the application range and installation efficiency of lightning protectors, and avoids signal interference.
Smart Images
Figure CN222691385U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lightning protection circuits, in particular to a signal and power lightning protection composite circuit that is independent of a ground line. Background Art
[0002] For small communication devices with signal and power ports, such as switches, surveillance cameras, etc., their signal lines and power lines are easily damaged by lightning and other surges during transmission. Traditional lightning protection circuits and lightning arresters need to be connected to the ground wire to achieve lightning protection effects, and these small communication devices are difficult to have a formal grounding network in the application environment, so it is difficult to use traditional lightning protection circuits and lightning arresters to play a role in lightning protection. In addition, some communication equipment is not suitable for using traditional grounding lightning protection circuits. For example, due to the different supply standards and reference grounds of remote communication equipment and near-end communication equipment, the potential difference of the signal line relative to the remote ground wire and the near-end ground wire is different. If the traditional grounding lightning arrester is directly used, the potential of the signal line corresponding to the near-end ground wire will be very high and break through the near-end lightning arrester, thereby interfering with the signal. Utility Model Content
[0003] In view of the deficiencies in the prior art, the utility model aims to provide a signal and power lightning protection composite circuit that is independent of a ground wire.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A signal and power lightning protection composite circuit that does not rely on a ground line, comprising a signal input terminal, a signal output terminal and a power port, wherein a plurality of pairs of signal transmission lines and signal receiving lines are connected between the signal input terminal and the signal output terminal, and the power port is connected to a neutral line and a live line; further comprising a discharge tube 1, a discharge tube 2, a varistor, a transient voltage suppression tube and a resistor;
[0006] The signal transmission line and the signal receiving line are both connected in series with a resistor, and a discharge tube 1 is connected in parallel between the paired signal transmission line and the signal receiving line, and a transient voltage suppression tube is connected in parallel, and the discharge tube 1, the resistor and the transient voltage suppression tube are arranged in sequence from the signal input terminal to the signal output terminal;
[0007] A discharge tube 2 is connected in parallel between the neutral line and the live line, and varistors are respectively connected in series on both sides of the discharge tube 2; the discharge tube 1 is connected to the discharge tube 2.
[0008] Furthermore, the discharge tube is a gas discharge tube.
[0009] The beneficial effect of the utility model is that the circuit of the utility model can play an effective lightning protection role without being connected to the ground network, which can reduce the cost of making the ground network and reduce the application cost. At the same time, it also improves the application range and installation efficiency of the lightning arrester, and can avoid the signal interference problem caused by the traditional grounding lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural diagram of the signal and power lightning protection composite circuit in the embodiment of the utility model. DETAILED DESCRIPTION
[0011] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to this embodiment.
[0012] This embodiment provides a signal and power lightning protection composite circuit that does not rely on a ground line, such as Figure 1 As shown, it includes a signal input terminal X1, a signal output terminal X2 and a power port X3, and also includes discharge tubes GDT1 and GDT2, varistors MOV1 and MOV2, a transient voltage suppressor (TVS) D1 and resistors R1 and R2.
[0013] A plurality of pairs of signal transmission lines and signal receiving lines are connected between the signal input terminal X1 and the signal output terminal X2. Figure 1 As shown, a pair of signal transmission line interfaces and signal receiving line interfaces (R, T) are provided on the signal input terminal X1, and a pair of signal transmission line interfaces and signal receiving line interfaces (R', T') are also provided on the signal output terminal X2, and the two ends of the signal transmission line and the signal receiving line are respectively connected to the corresponding interfaces on the signal input terminal X1 and the signal output terminal X2.
[0014] The signal transmission line and the signal receiving line are respectively connected in series with resistors R1 and R2, and a discharge tube GDT1 and a transient voltage suppressor D1 are connected in parallel between the paired signal transmission line and the signal receiving line. The discharge tube GDT1, the resistors R1 and R2, and the transient voltage suppressor D1 are sequentially arranged in the direction from the signal input terminal X1 to the signal output terminal X2;
[0015] Another discharge tube GDT2 is connected in parallel between the neutral line N and the live line L connected to the power port X3, and varistors MOV1 and MOV2 are respectively connected in series on both sides of the discharge tube GDT2; the discharge tube GDT1 is connected to the discharge tube GDT2.
[0016] In this embodiment, the discharge tube is a gas discharge tube.
[0017] It should be noted that the signal input terminal X1 is used to connect the signal line transmitted from the remote communication equipment. During the long-distance transmission process, it is very easy to generate a high-amplitude surge in the line through electromagnetic induction and electrostatic induction. In the above-mentioned lightning protection composite circuit, the first stage is the discharge tube GDT1 and the discharge tube GDT2. The discharge tube GDT1 is connected in parallel between the signal transmission line and the signal receiving line, and the discharge tube GDT2 is connected in parallel between the signal transmission line and the signal receiving line and the power line. The function is to ensure the equipotential between the signal transmission line and the signal receiving line, and between the signal line and the power line. The power port X3 clamps and limits the lightning surge on the power line through the varistors MOV1 and MOV2. This stage returns most of the surge to the power line to achieve the purpose of equipotential. The second stage is the resistors R1 and R2. The remaining small amount of surge flows through the resistors R1 and R2 to the third stage transient voltage suppression tube D1. The characteristics of the transient voltage suppression tube clamping voltage are used to limit the surge voltage to the range that the near-end signal equipment can withstand. Finally, the signal output terminal X2 is connected to the near-end communication device, and the safety signal previously passed through the lightning protection composite circuit is transmitted to the near-end communication device.
[0018] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the utility model.
Claims
1. A signal and power lightning protection composite circuit that does not rely on a ground line, comprising a signal input terminal, a signal output terminal and a power port, wherein a plurality of pairs of signal transmission lines and signal receiving lines are connected between the signal input terminal and the signal output terminal, and the power port is connected to a neutral line and a live line; characterized in that: It also includes a discharge tube 1, a discharge tube 2, a varistor, a transient voltage suppression tube and a resistor; The signal transmission line and the signal receiving line are both connected in series with a resistor, and a discharge tube 1 is connected in parallel between the paired signal transmission line and the signal receiving line, and a transient voltage suppression tube is connected in parallel, and the discharge tube 1, the resistor and the transient voltage suppression tube are arranged in sequence from the signal input terminal to the signal output terminal; A discharge tube 2 is connected in parallel between the neutral line and the live line, and varistors are respectively connected in series on both sides of the discharge tube 2; the discharge tube 1 is connected to the discharge tube 2.
2. The signal and power lightning protection composite circuit according to claim 1, characterized in that: The discharge tube is a gas discharge tube.