Power line carrier communication device and method

Abstract

The present application relates to the field of carrier communication, and in particular, to a power line carrier communication device and method. The device includes: a communication processing unit for modulating a communication signal into a control signal, the communication signal including communication data; a switch network unit for outputting a multi-level carrier signal corresponding to the communication signal according to the control signal, wherein the carrier contained in the signal n The harmonic components of the +1 order and the following orders are respectively less than or equal to the first threshold value, n represents the number of levels contained in the carrier signal, and n is an odd number greater than or equal to 3; the impedance network unit is used to filter the carrier signal and couple it to the power line. The invention improves the transmission efficiency of the power line carrier signal, greatly reduces the transmission power of the power line carrier signal; realizes that in the conversion process of the carrier signal, all or part of the low-order harmonics of the n+1 order and below are eliminated, reducing the reduction of the power line carrier signal. The requirement of the output low-pass filter greatly reduces the size and cost of the filter.

Description

technical field [0001] The present application relates to the field of carrier communication, and in particular, to a power line carrier communication device and method. Background technique [0002] Power line carrier communication uses the existing power line as the transmission medium and does not require additional communication cables. It has advantages in feasibility and cost, so it has been widely used in application scenarios such as power meter reading and distributed photovoltaic systems. [0003] The traditional power line carrier communication device first generates the carrier communication signal, and then filters out the high-order harmonic components through the filter, and then is amplified by the linear power amplifier and then coupled to the power line by the transformer. , not suitable for some application scenarios that require lower transmitter and standby power consumption. SUMMARY OF THE INVENTION [0004] Based on this, it is necessary to provide ...

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Problems solved by technology

[0003] The traditional power line carrier communication device first generates the carrier communication signal, then filters out the high-order harmonic components through a filter, and then amplifies it through a linear power amplifier, and then couples it to the power line by a transformer. The disadvantage is that the linear power amplifier has low efficiency, large loss, and serious heat generation. , not suitable for some application scenarios that require lower transmitter and standby power consumption

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