An Optimal Design Method for llc Resonant Converter

Abstract

The invention discloses an optimal design method of an LLC resonant converter, which includes: determining the transformation ratio of the transformer according to the design index of the LLC resonant converter; core shape, preliminarily design a transformer; measure the parasitic capacitance of the transformer; deduce the relationship between conduction loss and dead time, and obtain the optimal dead time when the conduction loss is the smallest; determine the optimal dead time according to the optimal dead time Optimal magnetizing inductance; select the inductance ratio and quality factor that can satisfy the gain condition; get the resonant inductance value and resonant capacitance value from the optimal magnetizing inductance, inductance ratio and resonant frequency; change the air gap of the transformer to make the magnetizing inductance equal to the optimal magnetizing inductance . This method solves the problem that the traditional LLC resonant converter design method relies too much on experience and is not accurate enough, makes the design result more accurate, and can be extended to various applications.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an optimized design method of an LLC resonant converter. Background technique [0002] Since its birth, LLC resonant converter has received more and more attention due to its outstanding advantages. The LLC resonant converter can realize the soft turn-on of the primary side switch tube in the whole working range, even if the switching frequency is very high, it can still achieve high efficiency. The increase of switching frequency is beneficial to reduce the volume of the transformer and filter, and the resonant inductor and magnetizing inductor can be integrated into the transformer, so high power density can be achieved. [0003] Because of the above advantages of LLC resonant converters, how to exploit the advantages of LLC resonant converters through precise design has become a hot issue concerned by researchers in related fields. The LLC resonant converter has two degr...

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Problems solved by technology

[0005] In order to solve the above-mentioned defects existing in the prior art, the object of the present invention is to provide a method for optimizing the design of LLC resonant converter with the goal of improving efficiency, taking into account the parasitic capacitance of the transformer, and solving the problem of traditional LLC resonant converter design. The problem that the method is too dependent on experience and not accurate enough can be extended to various applications

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