Abstract
A novel hybrid LLC resonant and dual active bridge (DAB) linear dc–dc converter is proposed as bus converter, which can achieve soft switching and constant output voltage gain at both the open-loop light load and closed-loop heavy load conditions. This paper focuses on its continuous-time average modeling in detail based on the dc output voltage, the first order terms of two transformer currents and the resonant capacitor voltage, which results in a seven-order model. Additionally, the total control-to-output transfer function is derived for the proposed hybrid converter dynamic analysis. The experimental results have verified that the proposed model can correctly match the small-signal frequency response, and compare with DAB, the related analysis based on the proposed model shows the novel hybrid converter can have a better output voltage response.
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