Composited resonance wide-range power converter

Abstract

The invention relates to a composited resonance wide-range power converter, comprising: N power units, wherein the each power unit comprises a switching device, an inductor and a capacitor, resonanceparameters of the power units are coupled; a rectification unit, wherein energy is transmitted to the rectification unit by the each power unit through a corresponding transformer; and N control signal units, wherein the each control signal unit is used for driving the switching device in the corresponding power unit. The composited resonance wide-range power converter is characterized in that theresonance parameters can be changed through adjustment on timing sequence of control signals, thus an output voltage or an output current of the rectification unit can be adjusted. In comparison withthe prior art, the composited resonance wide-range power converter of the invention has the beneficial effects that: the resonance parameters are directly influenced by changes of the control signals, thus wide-range input and fixed frequency control can be achieved, and the fixed frequency control is beneficial to optimized design of magnetic elements; if in combination with variable frequency control, an input range can be further expanded; and for a transformer, a large magnetic inductance can be used, thereby improving an efficiency.

Description

technical field [0001] The invention relates to a DC / DC power converter, in particular to a compound resonance wide-range power conversion system. Background technique [0002] High frequency, high power density, and high efficiency are the development trends of DC / DC power converters. Traditional hard switching converters will generate large switching losses and noise, which limits the improvement of power density and switching frequency. Therefore, the proposed Soft switching power converter. [0003] At present, the commonly used type is the phase-shifted full-bridge converter, which can realize the zero-voltage conduction (ZVS) of the main switching tube, but it is difficult to realize the soft switching of the lagging bridge arm, and the secondary rectifier diode has reverse recovery problems. It is not conducive to the improvement of efficiency. [0004] Another commonly used type is the LLC resonant converter, which can realize zero-voltage turn-on and zero-current ...

AI Technical Summary

Problems solved by technology

However, the LLC converter adopts a frequency modulation control method, which is not conducive to the optimal design of magnetic components, and in the case of a wide range of input, a small excitation inductance is required to meet the gain requirements, resulting in excessive excitation current at light loads and reduced efficiency.

Images