Analysis of Voltage Gain Tolerance Due to the Resonant Circuit Variation of LLC Resonant Converter

Hiroyuki Haga, Hidenori Maruta, Fujio Kurokawa

Abstract


The LLC converter is anattractive solution for high power application, hence many photovoltaic systems which use LLC converter have been proposed. It is important on mass production stage to clarify the relationship between design parameters and its voltage gain tolerance which is caused by component variations. This issue is especially important for systems whose LLC converter is directly connected to photovoltaic panels, because there is no boost converter which can compensate insufficient voltage gain of the LLC converter. However the voltage gain tolerance of the LLC converter has rarely studied. Therefore we researched the relationship between the voltage gain tolerance and three normalized parameters which are related to the resonant circuit by Monte Carlo analysis. As a result, it has found that there is a linear area where voltage gain tolerance becomes to be small in quality factor – inductance ratio plane. By utilizing this knowledge, designers can reduce unnecessary losses of the LLC converter which are generated by too much voltage gain margin.

Keywords


LLC converter; voltage gain; tolerance; Monte Carlo analysis

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v6i4.5304.g6952

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