Improved Cross-Regulation for Multi-Output Flyback Converters

This paper proposes a novel approach for mitigating cross-regulation errors in multi-output flyback converters by integrating a balancing capacitor. The approach establishes a low-impedance path between the transformer’s secondary windings, equalizing node voltages and reducing reducing load imbalance effects. Experimental validation on a prototype demonstrates significant mitigation of cross-regulation errors, with the balancing capacitor maintaining a negligible average voltage drop. Results reveal that residual output offsets under unbalanced loads stem primarily from differences in the forward voltages of the rectifying diodes. The analysis is extended to a multi-output flyback topology delivering balanced positive and negative outputs, confirming the method’s applicability to multi-output configurations. These findings underscore the versatility and effectiveness of the proposed strategy for improving cross-regulation in low-power industrial applications.