Five-element resonant network and converter

Abstract

The invention provides a five-element resonant network and a converter. A first LC series resonant structure and a second LC series resonant structure of the resonant network form a trap filter. Whenthe resonant network is applied to the resonant converter, a voltage gain curve can be quickly attenuated; the gain performance can be improved; wider voltage gain range adjustment can be realized within the same frequency range; third harmonic transmission power can be utilized; reactive circulation can be reduced; the conversion efficiency can be improved; natural slow start and short-circuit protection can be realized by improving the switch frequency; and the control complexity can be reduced.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to a five-element resonant network and a converter. Background technique [0002] Wide-gain DC-DC converters have very important applications in energy storage systems, electric vehicle on-board chargers and other fields. In the DC-DC converter, the resonant converter has received a lot of attention and attention because it can rely on the resonant characteristics of the resonant element itself to realize the soft switching of the switching tube. [0003] The core content of the resonant converter research work is the resonant cavity. A slight change in the number, type, parameter and topology of the resonant components in the resonant cavity may have a great impact on the working mode of the resonant cavity, and then change the entire converter. output characteristics. According to the division of the number of resonant elements and their combinations, common converters...

AI Technical Summary

Problems solved by technology

However, the input / output gain curve of LLC is relatively slow, and the overall efficiency is more advantageous only when working near the resonance point. Once the input or output voltage range of the converter is very wide, in order to meet the gain requirements, the value of the magnetizing inductance of the transformer is relatively small. lead to large circulating current and conduction loss

Therefore, it is difficult for the LLC resonant converter to achieve a balance between wide gain and high efficiency. In order to maintain high output efficiency, LLC will not be suitable for a wide gain range output environment, and it is urgent to explore a new resonant converter topology.

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