Signal lightning protection circuit without grounding wire

Abstract

The utility model discloses a signal lightning protection circuit without a grounding wire, which comprises a signal input terminal and a signal output terminal, a plurality of pairs of signal transmitting wires and signal receiving wires are connected between the signal input terminal and the signal output terminal, and a shielding wire is connected between the signal input terminal and the signal output terminal; the circuit also comprises a signal input terminal, a signal output terminal, a discharge tube, a transient suppression diode and a resistor. The signal transmitting line and the signal receiving line are connected in series with resistors; a discharge tube and a transient suppression diode are connected in parallel between the paired signal transmitting line and signal receiving line, and the discharge tube is also connected with a shielding line; the discharge tube, the resistor and the transient suppression diode are sequentially arranged in the direction from the signal input terminal to the signal output terminal. According to the utility model, the lightning protection effect can be effectively realized without connecting a grounding grid, and the problem of signal interference caused by a traditional grounding type lightning protection device can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection circuits, in particular to a signal lightning protection circuit that does not require a grounding wire. Background Art

[0002] Signal lines are mainly used to transmit signals. The voltage and current are relatively low, and the signal cables are relatively thin. During the transmission process, they are very easy to sense and receive surges including lightning. The intensity of these surges is very high relative to the amplitude of the signal. At the same time, there is no grounding point in the application of signal lines and signal equipment. Therefore, traditional lightning protection circuits and lightning arresters need to be connected to the ground wire to achieve lightning protection effects. However, in the actual application of existing signal lines and signal equipment, there is no grounding wire. Traditional signal lightning arresters cannot play a lightning protection role without wiring. Some signals are not suitable for using traditional lightning protection circuits with grounding. For example, the supply standards and reference grounds of remote signal equipment and near-end signal equipment are different, which makes the potential difference of the signal line relative to the remote ground wire and the near-end ground wire different. If a grounded 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 lightning protection circuit that does not require a grounding wire.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A signal lightning protection circuit without grounding wire, comprising a signal input terminal and a signal output terminal, wherein a plurality of pairs of signal transmission wires and signal receiving wires are connected between the signal input terminal and the signal output terminal, and a shielding wire is connected therebetween; the signal input terminal, the signal output terminal, a discharge tube, a transient suppression diode and a resistor;

[0006] Resistors are connected in series on both the signal transmission line and the signal receiving line;

[0007] A discharge tube and a transient suppression diode are connected in parallel between the paired signal transmission line and the signal receiving line, and the discharge tube is also connected to the shielding line;

[0008] The discharge tube, the resistor and the transient suppression diode are arranged in sequence along the direction from the signal input terminal to the signal output terminal.

[0009] Furthermore, the discharge tube is a gas discharge tube.

[0010] The beneficial effect of the utility model is that the signal lightning protection circuit of the utility model can effectively play a lightning protection role without being connected to the ground network, thereby reducing the cost of building the ground network and reducing the application cost. At the same time, it also improves the application range and installation efficiency of the signal lightning arrester, and avoids the problem of signal interference caused by traditional grounding type lightning arresters. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the signal lightning protection circuit in the embodiment of the utility model. DETAILED DESCRIPTION

[0012] 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.

[0013] This embodiment provides a signal lightning protection circuit that does not require a grounding wire. Figure 1 As shown, it includes discharge tubes GDT1-GDT4, transient voltage suppression diodes (TVS) D1-D4 and resistors R1-R8.

[0014] Several pairs of signal transmission lines and signal receiving lines are connected between the signal input terminal X1 and the signal output terminal X2, and a shielded line is also connected. Figure 1 As shown, the signal input terminal X1 is provided with four pairs of signal sending line interfaces and signal receiving line interfaces (R1', T1'), ..., (R4', T4'), and the signal input terminal X2 is also provided with four pairs of signal sending line interfaces and signal receiving line interfaces (R1", T1"), ..., (R4", T4"), and the two ends of each pair of signal sending line and signal receiving line are respectively connected to the corresponding interfaces on the signal input terminal X1 and the signal input terminal X2; the signal input terminal X1 and the signal output terminal X2 are respectively provided with shielded wire interfaces G and G', and the two ends of the shielded wire in the signal cable are respectively connected to the shielded wire interfaces G and G'.

[0015] Each signal transmission line and signal receiving line has a resistor in series, such as Figure 1 As shown, four signal sending lines and four signal receiving lines are respectively connected in series with resistors R1-R8.

[0016] A discharge tube and a transient suppression diode are connected in parallel between each pair of signal transmission lines and signal receiving lines, such as Figure 1 As shown, discharge tubes GDT1 - GDT4 and transient suppression diodes D1 - D4 are respectively connected in parallel between the four pairs of signal transmission lines and signal receiving lines; each discharge tube GDT1 - GDT4 is also respectively connected to the shielding line.

[0017] The discharge tube, the resistor and the transient voltage suppression diode are arranged in sequence along the direction from the signal input terminal X1 to the signal output terminal X2.

[0018] It should be noted that the discharge tube may be a gas discharge tube.

[0019] The signal input terminal X1 is used to connect the signal line transmitted from the remote signal device. During the long-distance transmission process, it is very easy to generate a surge with a high amplitude in the line through electromagnetic induction and electrostatic induction. In the above signal lightning protection circuit, the first stage is the discharge tube GDT1-GDT4, which is connected in parallel between the signal transmission line and the signal receiving line, and also in parallel between the signal transmission line and the signal receiving line and the shielding line. The function is to ensure the equipotential between the signal lines and between the signal line and the shielding line. This stage returns most of the surge to the shielding line. The second stage of the signal lightning protection circuit is the resistor R1-R8. The remaining small amount of surge flows to the third stage, that is, the transient suppression diode D1-D4 after passing through the resistor. The characteristic of the transient suppression diode clamping voltage is used to limit the surge voltage to the range that the near-end signal device can bear. Finally, it is connected to the near-end signal device through the signal output terminal X2, that is, the safety signal that has passed through the signal lightning protection circuit is transmitted to the near-end signal device.

[0020] 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 lightning protection circuit without a grounding wire, comprising a signal input terminal and a signal output terminal, wherein a plurality of pairs of signal transmission wires and signal receiving wires are connected between the signal input terminal and the signal output terminal, and a shielding wire is connected therebetween; characterized in that: It also includes a signal input terminal, a signal output terminal, a discharge tube, a transient suppression diode and a resistor; Resistors are connected in series on both the signal transmission line and the signal receiving line; A discharge tube and a transient suppression diode are connected in parallel between the paired signal transmission line and the signal receiving line, and the discharge tube is also connected to the shielding line; The discharge tube, the resistor and the transient suppression diode are arranged in sequence along the direction from the signal input terminal to the signal output terminal.

2. The signal lightning protection circuit without grounding wire according to claim 1, characterized in that: The discharge tube is a gas discharge tube.

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