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An improved large signal model of full-bridge LLC converter

机译：全桥LLC转换器的改进大信号模型

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摘要

For the full-bridge LLC converter, it is necessary to establish a large signal model with low-complexity and high-precision when the current of filter inductor works under the continuous conduction mode (CCM) situation. In terms of low complexity, peak values of resonant state variables and average values of slow state variables are taken as the measured indexes between models and actual converter. Models based on the first harmonic approximation (FHA) are studied in depth because they have lower complexity than the existing models. From prospective of high precision, deficiencies of typical FHA model are explained in the light of harmonic generation mechanism of primary current and influence of Fourier series on the typical equivalent circuit. Therefore, transient process of each metallic oxide semiconductor field effect transistor (MOSFET) and its related fast recovery diode, transient process of Schottky rectifier diodes, piecewise equivalent circuit, appropriate selection of variables, and simplified modified dynamic equations are all considered. Furthermore, the unified proposed model is achieved according to the equivalent principle of indexes between aforementioned improved analyses and proposed model. Numerical results of typical FHA model and proposed model are given in accordance with the key indexes. Then, corresponding experimental results are also presented. Differences of indexes between the two models and the actual converter are compared respectively. Though complexity of proposed model is the same as that of typical FHA model, precision of proposed model is higher than that of typical FHA model.
机译：对于全桥LLC转换器，当滤波电感器的电流在连续导通模式（CCM）情况下工作时，有必要建立一个具有低复杂度和高精度的大信号模型。在低复杂度方面，将谐振状态变量的峰值和慢状态变量的平均值作为模型与实际转换器之间的测量指标。对基于一次谐波近似（FHA）的模型进行了深入研究，因为它们的复杂度比现有模型低。从高精度的角度出发，结合一次电流的谐波产生机理和傅立叶级数对典型等效电路的影响，对典型FHA模型的不足进行了解释。因此，考虑了每个金属氧化物半导体场效应晶体管（MOSFET）及其相关的快速恢复二极管的瞬态过程，肖特基整流二极管的瞬态过程，分段等效电路，变量的适当选择以及简化的动态方程。此外，根据上述改进的分析与提出的模型之间的索引等价原理，实现了统一提出的模型。根据关键指标给出了典型FHA模型和建议模型的数值结果。然后，还给出了相应的实验结果。分别比较了两个模型和实际转换器之间的索引差异。虽然提出的模型的复杂度与典型的FHA模型相同，但是提出的模型的精度却比典型的FHA模型更高。

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