Bi-directional dual-input SEPIC direct-current converter and power distribution method thereof

Abstract

The invention discloses a bi-directional dual-input SEPIC direct-current converter and a power distribution method of the bi-directional dual-input SEPIC direct-current converter. The bi-directional dual-input SEPIC direct-current converter comprises a first SEPIC pulse current source unit, a second SEPIC pulse current source unit and an output filter circuit. The first SEPIC pulse current source unit comprises a first input direct current voltage source A, a first power switch tube M1, a second power switch tube M3, a first inductor L1, a second inductor L3 and a first capacitor C1. The second SEPIC pulse current source unit comprises a second input direct current voltage source B, a third power switch tube M2, a fourth power switch tube M4, a third inductor L2, a fourth inductor L4 and a second capacitor C2. The first SEPIC pulse current source unit and the second SEPIC pulse current source unit are connected in parallel, and the output filter circuit comprises an output filter capacitor C. The power distribution method includes power distribution and load feedback power control which are carried out on the two input direct current voltage sources. The bi-directional dual-input SEPIC direct-current converter and the power distribution method of the bi-directional dual-input SEPIC direct-current current have the advantages of being complex in circuit structure, capable of achieving boost and voltage reduction, wide in adjusting range of output voltage, capable of achieving energy feedback, small in loss, high in circuit efficiency, small in ripple in output voltage waveform and capable of being used on a large current occasion due to connection of two current sources in parallel, and an isolation transformer is not needed.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to a bidirectional double-input SEPIC DC converter and a power distribution method thereof. Background technique [0002] With the increasingly prominent environmental protection issues, people pay more and more attention to the development and utilization of renewable energy. Renewable energy has the characteristics of cheap, reliable, clean and pollution-free, and abundant energy, so renewable energy power generation has shown a good market prospect. At present, the most widely used renewable energy power generation forms include photovoltaic power generation, fuel cell power supply, wind power generation, hydropower generation, geothermal power generation, etc., but these power generation forms have the characteristics of unstable power supply, discontinuity, and changes with climate conditions. , so a distributed power supply system using multiple energy sources for j...

AI Technical Summary

Problems solved by technology

[0003] In the traditional new energy joint power supply system, each energy form usually requires a DC / DC converter to convert various energy sources into DC output, and connect them in parallel to the common DC bus to supply DC loads, but its structure is more complicated. and higher cost

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