Converter of interleaved parallel integrated Buck-Boost LLC circuit topology

Abstract

The invention discloses a converter for interleaving integrated Buck-Boost LLC circuit topology, which belongs to the field of direct current power electronic conversion, and is characterized in that a primary side circuit comprises two stages of interleaving Buck-Boost circuits and an LLC resonant circuit; each stage of Buck-Boost circuit comprises four switching tubes and a choking coil inductor, the front two switching tubes form a Buck bridge arm, the rear two switching tubes form a Boost bridge arm, and the choking coil inductor is connected between the midpoint of the Buck bridge arm and the midpoint of the Boost bridge arm; in each stage of Buck-Boost circuit, the phase shift angle between Boost bridge arms and Buck bridge arms is the minimum phase shift angle when each switching tube is subjected to soft switching, under the minimum phase shift angle, the loss of the converter is a single-value function related to the inductance value of the choking coil inductor, and the inductance value of the choking coil inductor is the inductance value when the loss of the converter is minimum. Two-stage phase shift 180-degree staggered parallel connection solves the problem of asymmetry of secondary side current, secondary side synchronous rectification is achieved, and soft switching and minimum loss are achieved while the phase shift angle and choking coil inductance value are designed.

Description

technical field [0001] The invention belongs to the field of DC power electronic conversion, and more particularly, relates to a converter with an interleaved parallel integrated Buck-Boost LLC circuit topology. Background technique [0002] In order to achieve the goal of energy saving and consumption reduction, and comply with the development trend of miniaturization and light weight, efficiency and power density have always been the core requirements and important indicators of power electronic converters. Reducing power loss and increasing switching frequency are the keys to achieving high efficiency and high power density. Soft switching technology is an effective way to reduce high switching losses at high frequencies. The LLC resonant converter can realize Zero Voltage Switch (ZVS) for primary switching and Zero Current Switch (ZCS) for secondary switching in a wide voltage range and wide load range. It is a high-efficiency, Good candidate topology for high power de...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and improvement needs of the prior art, the present invention provides a converter with an interleaved parallel integrated Buck-BoostLLC circuit topology, the purpose of which is to apply the interleaved parallel technology to the Buck-Boost LLC circuit topology to solve the secondary Asymmetry problem, so as to conveniently realize the synchronous rectification of the secondary side, and at the same time design the phase shift angle and the inductance of the choke coil, and at the same time ensure the soft switching of all switching tubes and the minimum loss

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