Integrated Transformer for Resonant Converters

The patent combines multiple transformer windings into a single integrated transformer with multiple primary coils and multiple secondary coils. The primary coils are connected in series and the secondary coils are connected in parallel, sharing a common magnetic core. This merging approach allows multiple current paths while maintaining uniform magnetizing inductance across all coils, thus reducing current stress without compromising current delivery uniformity.

The patent achieves magnetizing inductance adjustment by changing the number of turns in the coils and the core cross-sectional area, rather than introducing air gaps. Specifically, the magnetizing inductance can be adjusted by having air gaps, changing turn numbers of coils or using different types of core. This parameter change approach maintains continuous magnetic flux paths, eliminating gap-loss while still providing controlled magnetizing inductance values.

The patent segments the transformer into multiple primary coils and multiple secondary coils with standardized turn ratios. Each primary coil has the same number of turns and each secondary coil has the same number of turns, allowing for modular manufacturing. The standardized segmentation simplifies the winding process while still providing the needed magnetizing inductance control through the overall coil configuration and core design.

The patent uses a universal core design with multiple rim columns and a center column that can accommodate different numbers of primary and secondary coils. The core structure itself provides the magnetic path, and magnetizing inductance adjustment is achieved through coil configuration rather than requiring multiple specialized core types. This multi-functional core design simplifies manufacturing and reduces complexity while maintaining adaptability.