In the complex equipment system of communication base stations, although corona ring coil is not often paid attention to, it plays an important role in ensuring the stable operation of equipment and improving communication quality. Corona ring coil is not only related to high-voltage transmission lines, it can also keep the communication link unblocked by optimizing the distribution of electric fields in the communication base station.
The working state of the base station antenna that sends and receives signals directly determines the communication quality. In the high-frequency and high-voltage working environment of metal components such as antenna oscillators and feeder interfaces, it is easy to form a local strong electric field due to factors such as sharp corners of the structure or material mutations, which in turn produces corona discharge. This kind of discharge will release a high-frequency electromagnetic pulse, which will form noise interference with the weak signal received by the antenna, resulting in problems such as call caton and data transmission delay. The application of corona ring coil in this scenario is very targeted. Corona ring coil usually adopts an annular or flared structure, which closely fits key parts such as antenna feed and polarizer. Corona ring coil can disperse the concentrated electric charge through a metal material with excellent electrical conductivity, reducing the electric field gradient around the antenna by more than 30%, and curbing the generation of corona from the source.
The radio frequency module in the base station computer room can perform signal processing, including precision components such as power amplifiers, filters, and couplers. When these components are working, there is a very high voltage gradient between the internal electrodes, especially at the output of the power amplifier, the voltage can reach several thousand volts, which is very easy to produce corona discharge at the edge of the electrode. Long-term corona can cause oxidation of the electrode surface, aging of the insulating material, and even cause short-circuit failure, seriously shortening the life of the equipment. Corona ring coil is installed near the high-voltage electrode of the radio frequency module and uses the charge dispersion effect of the ring structure to control the electric field intensity around the electrode below the air breakdown threshold.
The antenna feed system can connect the antenna to the computer room equipment, including feeders, connectors, lightning arrester and other components. In feeder terminals, connector interfaces and other parts, due to impedance matching differences and structural mutations, the electric field is prone to local concentration, especially in rainy or humid weather, the air insulation strength decreases, and corona phenomenon is also prone to occur. The local high temperature generated by the corona will accelerate the aging of the connector seal, causing water vapor to penetrate and cause signal attenuation. In this scenario, for feeder interfaces of different specifications, corona ring coil will adopt an adjustable ring structure, tightly wrap the edges of the interface, and guide the electric field distribution through a smooth transition surface design.
The DC power supply system of the base station can provide stable power supply for the core equipment. When the connection terminals of the rectifier module and battery pack in the system are working at high currents, although the voltage is not high, the oxide layer or tiny burrs on the surface of the terminal can cause local electric field distortion and produce weak corona. Although the energy of this corona is small, it will produce continuous electrochemical corrosion, causing the terminal contact resistance to increase, causing heat and even fire hazards. Corona ring coil is usually installed in the busbar of the battery pack, the output terminal of the rectifier, etc. in the power supply system. Corona ring coil can eliminate the charge concentration point on the surface of the terminal through the conductive characteristics of the metal ring, and at the same time cooperate with the insulating coating to form a double protection.