Vehicle-mounted power line communication and adaptive impedance matching method

Abstract

The invention relates to the fields of power line communication and impedance matching, and in particular relates to a vehicle-mounted power line communication and adaptive impedance matching method comprising a whole system composed of a measurement unit, a control unit and an impedance matching unit; the measurement unit measures the physical impedance parameter of a power line to acquire a signal envelop, active power and a Boolean variable used as reference propagated by the power line, and outputs the same to serve as input parameters of the control unit; the control unit acquires an actually measured impedance, compares the actually measured impedance with a matched target impedance, uses Smith Chart as a tool to analyze and achieve the adaptive impedance matching method, determinesthe topological structure of a matched network, acquires a control signal and transmits the control signal to the impedance matching unit; and the impedance matching unit achieves matching with the target impedance according to the parameter value of a parameter element in a control signal adjustment set.

Description

technical field [0001] The invention relates to the fields of power line communication and impedance matching, in particular to an adaptive impedance matching method for vehicle power line communication. Background technique [0002] Power Line Communication (PLC) is a communication technology that uses the power line that transmits electric energy as a communication medium without laying additional communication lines. It has the advantages of low cost, wide coverage, and low construction difficulty. With the continuous development and improvement of PLC technology, PLC has been widely used in remote meter reading systems, street lamp remote monitoring systems, industrial intelligence and other fields. important role. In-vehicle power line communication mainly uses the DC transmission line in the vehicle as the medium for data transmission. High-speed, long-distance, stable and reliable PLC has always been the focus of research. Impedance matching, as an indispensable par...

AI Technical Summary

Problems solved by technology

This method adopts the matching scheme of both the source end and the terminal, and designs an impedance matching system integrating a measurement unit, a control unit and an impedance matching unit, which can effectively improve the accuracy and adaptability of impedance matching, and overcome the traditional fixed network The topological matching scheme cannot meet the defects of variable impedance matching requirements

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