Applying transformer concept to nonisolated voltage regulators significantly improves the efficiency and transient response

A voltage regulator (VR) is a DC-DC converter dedicated to powering the microprocessors in today's computers. The multiphase buck converter, as the current solution, faces great challenges for future use in VRs. This paper applies the transformer concept to generate several families of new converters, therefore providing opportunities to improve the efficiency while maintaining good transient response. Topology derivation, analysis and experimental results are presented. Test results verify the theoretical prediction.