Topological magnetic integrated converter suitable for LLC resonance series

Abstract

According to the defect that the magnetic member of the existing LLC resonant converter has a larger volume, the invention provides a magnetic integrated converter suitable for LLC resonant series topology, pertaining to the direct current converter. The converter designs the transformer and inductances in the original circuit of the converter into an integrated magnetic member, the converter not only can decrease the volume of the magnetic members, but also allows the leakage inductance to be easy to control, wherein the leakage inductance are centralized at primary side. The converter includes a direct-current power supply, an LLC resonant transformer, a primary circuit and a secondary rectification circuit, the converter uses the integrated magnetic member as a magnetic integrated converter, wherein, the integrated magnetic member includes a couple of relative setup EE iron cores, the iron cores are respectively winded with a primary winding and a secondary winding, part of the primary winding and entire secondary winding are winded at the middle pole, the other part of the primary winding are winded at the left side pole or right side pole; the input end of the primary winding is connected to the primary circuit, the output end of the secondary winding is connected to the secondary rectification circuit.

Description

1. Technical field [0001] The topological magnetic integrated converter suitable for LLC resonant series of the present invention belongs to a direct current converter of an electric energy conversion device. 2. Background technology [0002] With the development of modern power electronics technology and the birth of high-frequency switching devices, switching power supplies are developing in the direction of high frequency, integration and modularization. Facts have proved that increasing the switching frequency can reduce the size of the device, improve the power density and reliability of the equipment, and reduce the switching noise. Because the resonant converter can achieve soft switching, effectively reduce the switching loss, and further increase the frequency, it has been widely valued and studied in the field of high-frequency power conversion. The LLC resonant converter is to add the LLC resonant network to the converter, so that the switching tube can realize Z...

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Problems solved by technology

However, this method requires a magnetic conductor, and there are leakage inductances on both the primary and secondary sides of the transformer, which will affect the performance of the converter

Arkadiy Kats, Gregory Ivensky, Sam Ben-Yakov, "Application of Interated Magnetics in Resonant Converters", IEEE-APEC, 1997pp.925-930 provides another way to obtain multiple magnetic circuits, which has been successfully applied in resonant converters , the two magnetic cores A and B are used in combination, the primary winding of the transformer is wound on the two magnetic cores, and the secondary winding is only wound on the magnetic core A, so that the leakage inductance of the transformer is concentrated on the primary side, and can be adjusted by The air gap of magnetic core B is used to accurately control the leakage inductance. Although this method can solve the problem of leakage inductance on both the primary and secondary sides, it requires two magnetic cores, and the total magnetic volume is not substantially reduced.

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