Broadband coupling circuit for multicarrier communication

Abstract

The invention discloses a broadband coupling circuit for multicarrier communication. The circuit comprises a coupling transformer and an LC series-resonant circuit, wherein the LC series-resonant circuit is connected with a power amplifier output end which is used for amplifying a to-be-transmitted band-pass signal, a primary side of the coupling transformer is connected with a capacitor of the LC series-resonant circuit in parallel so as to obtain the amplified band-pass signal, and a secondary side of the coupling transformer is connected with an AC power line. The broadband coupling circuit for multicarrier communication meets smooth transmission of the band-pass signals of all frequency points in a multicarrier frequency point power line carrier communication system, and the amplitude-frequency characteristic of the circuit is flat; the circuit plays an excellent role in attenuation of low-frequency noise signals; and simultaneously, the circuit provides release loop protection in a case of surging.

Description

technical field [0001] The invention relates to a coupling circuit, in particular to a wide-band coupling circuit used in a multi-carrier communication system. Background technique [0002] At present, the commonly used power line carrier communication system is generally a single-frequency point carrier signal transmission under different modulation methods. Due to various power line loads on the power grid and random access and cut-out changes of power equipment, complex and changeable power line channel characteristics , for single-carrier power line signal communication, when the frequency of interference on the power line is the same or similar to the frequency of the transmitted carrier signal, it will seriously affect the success rate of power line carrier communication. The coupling circuit adapted to single-frequency point carrier power line communication is a band-pass filter with a narrow passband, which sets the resonance point at the frequency point of the carri...

AI Technical Summary

Problems solved by technology

[0002] At present, the commonly used power line carrier communication system is generally a single-frequency point carrier signal transmission under different modulation methods. Due to various power line loads on the power grid and random access and cut-out changes of power equipment, complex and changeable power line channel characteristics , for single-carrier power line signal communication, when the frequency of interference on the power line is the same or similar to the frequency of the transmitted carrier signal, it will seriously affect the success rate of power line carrier communication

The coupling circuit suitable for single-frequency point carrier power line communication is a band-pass filter with a narrow passband, which sets the resonance point at the frequency point of the carrier signal, and only passes the selected carrier signal, attenuating other frequency signals, so The coupling circuit is not practical for broadband signals

Images