Current-type multi-resonance direct current (DC) converter

Abstract

The invention relates to direct current (DC) step-up power conversion technology and discloses a current-type multi-resonance DC converter. The current-type multi-resonance DC converter comprises a square-wave current source generator, a multi-resonance network and a rectification filtering output unit which are sequentially connected in series, and is characterized in that: the multi-resonance network comprises a transformer, a parallel resonant inductor, a parallel resonant capacitor and a serial resonant inductor, wherein the serial resonant inductor is connected with a primary side of thetransformer; the rectification filtering output unit comprises a diode rectifying circuit and a filtering capacitor which is connected with an output end of the diode rectifying circuit in parallel.

Description

technical field [0001] The invention relates to a DC step-up power conversion technology, in particular to a current-mode multi-resonance DC converter. Background technique [0002] With the increasingly serious environmental problems brought by fossil fuels and the depletion of traditional energy sources, the new energy industry has developed rapidly. However, many emerging energy sources, including solar energy and fuel cells, have low-voltage, high-current DC output characteristics, and high-efficiency boost power conversion technology has become the key to effectively utilizing these emerging energy sources. [0003] The voltage-type boost converter has the advantages of simple structure and easy control. However, its boost function completely depends on the high transformation ratio of the transformer. Transformers with a high step-up ratio often have poor primary-secondary coupling, large leakage inductance, and large inter-turn capacitance, which will generate voltag...

AI Technical Summary

Problems solved by technology

Some people introduce transformers to feed back additional resonance energy to reduce circulation losses, but the introduced transformers will increase the volume of the converter and affect the quality factor, so this method is not suitable for occasions that require high power density and voltage regulation

[0007] In addition, the rectifier diode of the current-mode parallel resonant DC converter still has reverse recovery problems, and the voltage stress of the rectifier diode is still high, so it is difficult to select an ultra-fast recovery diode with a lower withstand voltage and a lower on-state voltage drop as the rectifier diode

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