Resonant type switching converter

Abstract

The embodiment of the invention relates to a resonant type switching converter comprising a multilevel generating circuit and a resonant circuit. The multilevel generating circuit is capable of generating first voltage signals that at least have two values and are not larger than an input voltage. The resonant circuit reuses the part of or all power transistors in the multilevel generating circuitto reduce the input voltage of the resonant branch and realize high controllability, so that the voltage drops applied to the power transistors are reduced and the switching tube stress and the switch losses are reduced. Moreover, because of switching controlling between paths of multi-path first voltage signals having the same values, the switching frequency is increased equally, the high frequency is realized and the volume and cost of the system circuit are reduced.

Description

technical field [0001] The present invention relates to power electronics technology, and more specifically, to a resonant switching converter. Background technique [0002] With the development of the field of power electronics, switching converters have been used more and more widely. Correspondingly, the design of switching converters is also facing more and more challenges, including high power density, high efficiency and fast The dynamic characteristics and other comprehensive performance requirements. [0003] In order to achieve a higher power density, the method of increasing the switching frequency is usually used to reduce the volume of magnetic components such as capacitors, transformers, and inductors, but the increase in switching frequency will lead to an increase in switching losses, thereby reducing the efficiency of the switching converter. [0004] Soft switching technology is one of the important technologies to realize high frequency of switching conver...

AI Technical Summary

Problems solved by technology

[0005] Existing isolated converters, such as flyback converters, forward converters, half-bridge converters, etc., can use quasi-resonance to achieve soft switching, but there are still large stresses on power devices and power The loss is large, the limitation of the switching frequency affects the improvement of the power density, the transformation ratio of the transformer is large, and the volume is large, etc.

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