Isolated three-level bidirectional DC-DC converter with coupling inductor

Abstract

The invention discloses an isolated three-level bidirectional DC-DC converter with a coupling inductor. The isolated three-level bidirectional DC-DC converter comprises a high-voltage side input capacitor, a low-voltage side input capacitor, a high-voltage side power supply, a low-voltage side power supply, a first power switching tube, a second power switching tube, a third switching tube, a fourth power switching tube, a first diode, a second diode, a third diode, a fourth diode, a first coupling filter inductor, a second coupling filter inductor, wherein the first coupling filter inductor and the second coupling filter inductor are coupled to each other. The isolated three-level bidirectional DC-DC converter has the advantages of small output current ripple and low loss of switching tubes, and is also relatively simple in structure.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to an isolated three-level bidirectional DC-DC converter with coupled inductors. Background technique [0002] In the 21st century, the main source of energy for human beings still relies on the consumption of fossil energy. The massive development of this non-renewable energy not only threatens human beings with energy depletion, but also brings huge damage and harm to the environment in which human beings live. With the development of renewable energy such as solar energy and wind energy and the continuous innovation of conversion technology, the research and application of renewable energy in countries around the world are becoming more and more mature. Among them, the DC-DC converter used in electric energy conversion technology plays an important role in energy storage, exchange and conversion. In different applications, the input and output ripple of the DC-DC converter and the bidirection...

AI Technical Summary

Problems solved by technology

The traditional Buck / Boost type bidirectional DC-DC converter has been widely used due to its simple circuit structure, but the single power device has high withstand voltage, large switching stress, large switching loss, large output ripple and other technical shortcomings. The upper limit value of its further application

In recent years, with the introduction of technologies such as interleaved parallel connection and three-level topology, the above-mentioned problems of bidirectional DC-DC converters have been overcome and weakened to a certain extent or in a certain aspect, but they often cannot solve the above-mentioned problems comprehensively.

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