Electromagnetic shielding device for signal line control circuit protector with power surge protector

Abstract

The invention discloses an electromagnetic shielding device for a signal line control circuit protector with a power surge protector. The electromagnetic shielding device is characterized in that an inner shielding body with 1-5 layers and an outer shielding body are of a closed edge-free box structure; a power surge protector (SPD) is arranged between the inner shielding body and the outer shielding body made of low-carbon steel plates with the manufacturing thickness of 10mm; by virtue of the signal line control circuit protector (SPD), current inducted by a high-intensity magnetic field is prevented from entering the shielding bodies along a power supply and signal cable; the power surge protector (SPD) connected with a grounding conductor of the shielding bodies is in grounding or equipotential connection, high current which is instantaneously inducted on the surface of the shielding bodies in the high-intensity magnetic field is discharged, a non-conductive and non-magnetic fixing framework is used for fixing the inner and outer shielding bodies, wire inlet and outlet holes are in a corresponding relationship and are not on the same line, and outward push-and-pull doors are arranged on the side surfaces of the shielding bodies. The electromagnetic shielding device is novel in design, ingenious in combination and easy to mount, and the shielding requirements on the high / low frequency magnetic field are met.

Description

technical field [0001] The invention relates to a power surge protector (SPD); a signal line, control line protector (SPD); and an electromagnetic shielding device. In particular, it means that a power surge protector (SPD) is arranged between the inner and outer shields of a multi-layer shielding device; the signal line and control line protector (SPD) are arranged to prevent the strong magnetic field generated by the explosion of the electromagnetic pulse weapon The current induced by the cable enters the shielding body, and the grounding wire connects the inner and outer shielding body and the power surge protector (SPD). Through grounding or equipotential connection, the huge current induced by the strong electromagnetic field on the surface of the inner and outer shielding body is released. Background technique [0002] Electromagnetic pulse (EMP) is the weakness of the inherent electromagnetic properties of components in electronic systems, which can paralyze or destro...

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Problems solved by technology

[0005] 2. Non-nuclear electromagnetic pulse (EMP) utilizes the energy generated by the explosion of explosives or the combustion of chemical fuels, and converts it into high-power microwave radiation energy through microwave devices, which can emit radiation with a peak power above gigawatts and a frequency of 1 GHz to 300 GHz Pulsed microwave beams rapidly generate transient voltages of thousands of volts on exposed conductors (such as exposed wires, printed circuit board traces), causing irreparable damage to a large number of electronic devices

[0040] closed shielding body), it has the characteristics of simple structure, convenient manufacture, and low cost. 1. The shielding coefficient is low, generally 20-30dB; 2. It cannot be compatible with the shielding of strong magnetic field and weak magnetic field at the same time; 3. The shielding layer is exposed to the outside, and it is easy to be impacted and collided, which will reduce the shielding effectiveness (the high magnetic permeability alloy is impacted. , the magnetic permeability will decrease); therefore, this single-layer ultra-low frequency electromagnetic shielding device is only suitable for places with low shielding requirements (the electromagnetic shielding coefficient is 20-30dB; the higher the electromagnetic shielding The stricter the shielding requirements), and for places with higher shielding requirements (electromagnetic shielding coefficient is 75 ~ 90dB), generally speaking, it cannot be realized

Even if the shield is thickened, the shielding effect is not ideal

[0041] 2. Among the three main measures (shielding, grounding, and filtering) to prevent electromagnetic pulses, shielding alone cannot provide complete electromagnetic pulse protection, because cables on equipment or systems are the most effective antennas for receiving and transmitting electromagnetic pulses

[0042] 3. In the grounding wire of the existing single-layer or multi-layer electromagnetic shielding device, there is no power surge protector (SPD). After the electromagnetic pulse weapon explodes, the strong electric field and strong magnetic field generated will be induced on the grounding wire. The voltage of thousands of volts to tens of thousands of volts and the current of thousands of amperes to tens of thousands of amperes enter the shielding body along the gap of the grounding wire shielding body,

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