Overcurrent lightning protection circuit for HFC transmission device and HFC transmission device thereof

Abstract

The invention discloses an overcurrent lightning protection circuit for an HFC transmission device and the HFC transmission device. The overcurrent lightning protection circuit comprises a radio frequency transmission main circuit, a gas discharge tube branch circuit and an inductance overcurrent branch circuit, and the gas discharge tube branch circuit is connected with the inductance overcurrentcircuit in parallel, wherein the inductor over-current circuit comprises a first over-current inductor and a second over-current inductor which are connected in series, the first over-current inductor and the second over-current inductor are both magnetic bar coil inductors; and the inductance value of the first over-current inductor is smaller than that of the second over-current inductor. According to the present invention, the radio frequency end of the magnetic rod coil inductor with the larger inductance value is connected with the magnetic rod coil inductor with the smaller inductance value in series, so that the parasitic capacitance of the magnetic rod coil inductor with the larger inductance value can be reduced, under the condition that the parasitic inductance is not changed, the parasitic capacitance is reduced, and the corresponding parasitic resonance frequency can be increased, and accordingly, the requirement for higher frequency of the HFC transmission device is met,and the HFC transmission device is ensured to realize a higher radio frequency index.

Description

technical field [0001] The invention relates to HFC transmission equipment technology, in particular to an overcurrent lightning protection circuit for HFC transmission equipment and the HFC transmission equipment. Background technique [0002] HFC is the abbreviation of Hybrid Fiber-Coax, which refers to a broadband transmission platform that combines an optical fiber transmission system with a coaxial cable distribution network. Compared with the coaxial cable network, the HFC network has low loss, high reliability, strong anti-interference ability and wider bandwidth, which creates favorable conditions for the development of network multi-functional integrated services. Therefore, HFC transmission equipment is widely used in various integrated services. [0003] The HFC transmission equipment connects the over-current lightning protection circuit at its input port for lightning protection and current over-inductance. In the over-current lightning protection circuit, a si...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an overcurrent lightning protection circuit for HFC transmission equipment in view of the problem that the overcurrent lightning protection circuit in the prior art cannot meet the higher frequency requirements of HFC transmission equipment and easily lead to the degradation of the radio frequency index of HFC transmission equipment. Current lightning protection circuit and HFC transmission equipment, by connecting a magnet coil inductor with a small inductance value in series at the radio frequency end of the magnet coil inductor with a large inductance value, to reduce the parasitic capacitance of the magnet coil inductor with a large inductance value , the parasitic inductance remains unchanged, the parasitic capacitance becomes smaller, and the corresponding parasitic resonant frequency becomes higher, so as to meet the requirements of higher frequency and higher bandwidth of HFC transmission equipment and ensure the radio frequency index of HFC transmission equipment

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