Full-Bridge LLC Resonant Converter with Parallel-Series Transformer Connection and Voltage Doubler Rectifier

This paper proposes an LLC resonant converter with parallel-series transformer connection and voltage doubler rectifier (PSVD LLC), i.e. LLC circuit structure in which the transformers are parallel-series connected and the secondary side is voltage doubler rectifier. The parallel-series connection can reduce the turns ratio of the transformer. And the use of the characteristics of the voltage doubler rectifier circuit improves the efficiency of the system, especially in the application of high frequency, low input voltage and high output voltage. This paper introduces the structure and working modes of the proposed circuit and analyzes the principle of how this circuit improves efficiency. A 1000W prototype of the proposed circuit is established to verify the effectiveness of the scheme.