Interleaving LCLC resonant converter with wide load and wide gain

Abstract

The present invention discloses an interleaving LCLC resonant converter with a wide load and a wide gain. The interleaving LCLC resonant converter comprises an input direct current source, two primaryinversion networks, two first resonance inductors, two first resonance capacitors, two second resonance inductors, two second resonance capacitors, two transformers, a secondary rectification circuit, an output filter capacitor and an output load. A hybrid control mode of frequency conversion and phase shift is employed to achieve wide voltage gain in a wide load condition. The second resonance capacitors and the second resonance inductors are connected in series to obtain adjustable equivalent excitation inductance, the equivalent excitation inductance is smaller to facilitate achieving of the high voltage gain at a low frequency, and the equivalent excitation inductance is larger to facilitate improvement of the working efficiency at a high frequency. The maximum switching frequency isa resonant frequency, the phase between the two modules is regulated at this frequency to further widen the voltage gain so as to ensure the zero-voltage turning-on of a primary switch tube and the zero-current turning-off of a secondary rectification tube in the whole working range and facilitate achievement of high efficiency and high power density.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to an interleaved parallel LCLC resonant converter with wide load and wide gain. Background technique [0002] With the increasing problems of environmental pollution and energy shortage, people pay more and more attention to renewable energy, and the country has also begun to vigorously develop and promote new energy power generation technology and new energy vehicles, but the power electronic converters used in these occasions are all A wide gain range is required. Therefore, in order to efficiently utilize renewable energy and reduce energy waste, a power electronic converter capable of achieving a wide gain adjustment range and having high operating efficiency and power density is required. [0003] In recent years, resonant converters have attracted a lot of attention and attention because of their soft switching characteristics, especially LLC series reson...

AI Technical Summary

Problems solved by technology

This type of scheme can effectively broaden the gain range, but there are sudden mode switching, which may cause overshoot problems, and the continuity of gain in different modes needs to be considered in parameter design

[0008] In order to broaden the range of voltage gain and ensure high overall operating efficiency, existing improvements to traditional LLC resonant converters have certain limitations. Therefore, a new improved topology is urgently needed to achieve wide voltage gain at high efficiency.

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