What is the principle of New Video Signal Lightning Arrester to protect video signals? (Communities - Activities)
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What is the principle of New Video Signal Lightning Arrester to protect video signals? | |
1. Signal shunt principle New Video Signal Lightning Arrester mainly uses the principle of signal shunt to protect video signals. When overvoltage pulses such as lightning intrude along the video line, there are special shunt elements inside the arrester. These elements are generally made of materials with nonlinear characteristics, such as zinc oxide varistors. Under normal circumstances, the voltage of the video signal is within the safe range, and these shunt elements are in a high-impedance state, which has almost no effect on the transmission of the video signal. However, when encountering high voltage generated by lightning strikes, the resistance of the shunt element will drop sharply, guiding the overvoltage pulse to the ground, thereby avoiding high voltage damage to video equipment and signal transmission lines. It is like opening a flood discharge channel when a flood comes, diverting the dangerous torrent and ensuring the smooth flow of normal water (video signal). 2. Signal filtering principle In addition to shunt, signal filtering is also an important part. Inside the arrester, there are filtering circuits that can filter video signals. When lightning strikes, in addition to generating high voltage pulses, it may also be accompanied by high-frequency interference signals. The filter circuit can identify and filter out these interference signals, allowing only normal video frequency signals to pass through. For example, for high-definition video signals (such as HDMI signals), there is a specified frequency range. The filter circuit is like a precise sieve, which filters out interference signals that do not belong to this frequency range, so that the video signal after passing through the arrester can still maintain clear and stable transmission, and prevent the appearance of snowflakes and flickering on the screen due to lightning interference. 3. Principle of equipotential connection New Video Signal Lightning Arrester also adopts the principle of equipotential connection. It can balance the potential at the interface of the video device with the earth potential. When lightning occurs, the lightning pulse may cause the potential at the interface of the device to rise instantly, thereby damaging the internal circuit of the device. Through equipotential connection, the arrester can pull the potential at the interface down to a level close to the earth, avoiding the discharge phenomenon caused by excessive potential difference from damaging the video signal equipment. This is like building a balanced bridge between two points that may produce dangerous voltage differences, ensuring that the "voltage water level" on both sides is in a relatively safe state. 4. Principle of coupling and decoupling mechanism There is also a coupling and decoupling mechanism inside the arrester. Coupling means that the normal video signal can pass through the arrester smoothly, while decoupling means separating the overvoltage from the video signal line when encountering lightning overvoltage. When the normal video signal enters the arrester, the signal can be transmitted losslessly through a reasonable coupling method, such as capacitive coupling. When the high voltage generated by the lightning strike arrives, the decoupling element comes into play, separating the high voltage pulse from the video signal, and then conducting the high voltage to the ground through the shunt method mentioned above, ensuring that the video signal can still be safely transmitted when threatened by lightning. | |
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| Target State: All States Target City : All Cities Last Update : 07 November 2024 7:13 AM Number of Views: 17 | Item Owner : fang Contact Email: Contact Phone: (None) |
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2024-11-24 (0.386 sec)