Lightning protection system and method of direct-current remote supply power equipment

Abstract

The invention discloses a lightning protection system and method of direct-current remote supply power equipment. The system comprises a C-level lightning protection device, a lightning protection decoupling module, and a D-level lightning protection clamping module. The C-level lightning protection device is electrically connected with an output terminal of a power supply; the C-level lightning protection device is electrically connected with the D-level lightning protection clamping module by the lightning protection decoupling module; and a lightning protection piezoresistor is arranged inside the C-level lightning protection device. According to the invention, the C-level lightning protection device uses the built-in lightning protection piezoresistor to discharge parts of lightning currents and the rest of lightning currents are prevented outside the power supply by a common-mode inductor and a differential-mode inductor of the lightning protection decoupling module, so that the residual voltage inside the power supply is minimized. And the lightning current residual voltage in the power supply is clamped at about 900V by the piezoresistor and a gas discharge tube of the D-level lightning protection clamping module, so that the model selection of components inside the power supply becomes convenient substantially.

Description

technical field [0001] The invention relates to the communication field, in particular to a lightning protection system and a method for DC remote power supply equipment. Background technique [0002] In recent years, my country's communication industry has developed rapidly. The communication power supply is the infrastructure of the entire communication network and the guarantee for the normal and reliable operation of the entire communication and telecommunication network. With the popularization and development of the 3G network, the construction of mobile base stations, EPON and indoor and outdoor computer rooms The power supply and connection problems are all completed by the DC remote power supply equipment. Since the remote power supply lines of these devices are directly exposed to the harsh environment of the lightning electromagnetic field, it is easy to attract lightning and cause damage to the equipment. Therefore, lightning protection in DC power supply is a man...

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Problems solved by technology

The requirement for lightning protection in the remote supply industry standard is 8 / 20us20KA level C lightning protection that meets the needs of the system. At present, the protection of lightning protection in the industry is usually achieved by adding a lightning protection device that can withstand 20KA at the output port. The disadvantages of this lightning protection method are: the residual voltage will be high, which limits the selection of components inside the power supply, which not only greatly increases the cost of the equipment, but also the lightning protection is not in place, resulting in damage to the electronic components inside the equipment, shortening the service life of the device

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