Voltage conversion circuit applied to photovoltaic modules with integrated carrier transmission function

Abstract

The invention relates to a voltage conversion circuit applied to a photovoltaic module with an integrated carrier transmission function. A first inductance is arranged on the voltage output path of the voltage conversion circuit used as a switch-mode power supply, and two terminals of the first inductance are connected in parallel and connected in series. The first switch and the first capacitor are connected together. The communication stage of the voltage conversion circuit transmitting the carrier signal The mode of identifying the carrier signal includes: driving the first switch to turn on, and the DC transmission line that transmits the output voltage is defined as the carrier signal because the high-frequency switching ripple that is regarded as the carrier signal is filtered out The first logic state of the first logic state; drive the first switch to turn off, and the DC transmission line that transmits the output voltage is defined as the second logic state of the carrier signal because the high-frequency switching ripple that is regarded as the carrier signal is mixed on the DC transmission line that transmits the output voltage. The logic states represented by the logic state and the second logic state are opposite to each other.

Description

technical field [0001] The present invention mainly relates to the field of photovoltaic power generation. To be precise, it relates to the use of voltage converters that can realize step-down and step-up or buck-boost in applications containing photovoltaic cells, and can determine the pair and voltage according to actual conditions. The target working data of the photovoltaic modules paired with the converter is sent and received by means of carrier communication. Background technique [0002] With the rapid development of the global photovoltaic power generation industry and the high penetration of the Internet, intelligence has become the development trend of photovoltaic power plants. Intelligent power generation, efficient operation and maintenance, and safety management have become industry consensus. Use the professional technology in the field of information and communication to propose intelligent solutions for photovoltaic power plants, build the Internet of Thing...

AI Technical Summary

Problems solved by technology

Sampling like this to improve the reliability of the signal is only one aspect, but in the case where the photovoltaic cell and the carrier are applied at the same time, the voltage level of the photovoltaic cell itself will be greatly changed due to the influence of the ambient temperature and the intensity of light radiation. , so the distortion of the carrier signal propagating on the power line and the characteristics of the battery, which is easy to fluctuate, are mixed together, resulting in inaccurate real carrier signals that the receiver expects to capture, high bit error rates and photovoltaic cell strings. The superimposed voltage of the group is also subject to carrier interference, so the actual voltage on the entire string may not be within the expected range

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