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Hybrid dual output LLC converter with low slave output rectifier current

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Abstract

In this study, a new hybrid dual output LLC DC-DC converter is proposed. The proposed converter has a simple structure and combines the advantages of conventional LLC and PWM converters. The proposed converter reduces the effective currents of the transformer slave output winding, slave output rectifiers and slave output filter capacitor using just one output filter inductor as in continuous conduction mode PWM converters. Detailed theoretical analysis has been made and verified with an experimental switched mode power supply having 55.8 V–400 W and 12 V–50 W isolated and independent outputs. The effect of using filter inductance at the slave output rectifier of the LLC converter has been investigated and the necessary conditions for soft switching operation have been obtained. The proposed converter achieves soft switching for all different output power values. Compared to the conventional dual output LLC converter, the effective currents of the LLC transformer slave output winding and the slave output rectifiers are reduced from 2.45 to 1.8 Arms. The peak efficiency of the proposed dual output LLC converter is measured as 97.2%.

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  1. Electical-Electronis Engineering Department, İzmir Katip Celebi University, 35620, İzmir, Turkey

    Hüseyin Yeşilyurt

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  1. Hüseyin Yeşilyurt
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Correspondence to Hüseyin Yeşilyurt.

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This work was supported by Tron A.Ş.

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Yeşilyurt, H. Hybrid dual output LLC converter with low slave output rectifier current. Electr Eng 104, 3241–3251 (2022). https://doi.org/10.1007/s00202-022-01545-0

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