A New Approach Integrated Magnetics Double-Frequency DC/DC Converter

Abstract

Double-frequency DC/DC converter can improve switching frequency and reduce switching loss than single-frequency DC/DC converter. However, it is heavy and large due to its small high-frequency inductor and large low-frequency inductor. In this article, based on the study on the magnetic integration of the double-frequency DC/DC converter, a novel magnetic integration method was proposed to integrate two inductors with different working frequencies into an EE magnetic core. The proposed magnetic integration scheme is attractive: It outperforms the discrete magnetic double-frequency DC/DC converter in the weight and volume reduction of the magnetic components, the power density improvement of the converter and cost reduction. Compared with the existing solutions of integrated magnetic double-frequency DC/DC converter, this method can further increase the power density of the converter, and reduce the saturation of the magnetic integration components, thereby reducing the iron core loss, as well as improving the dynamic response of the low frequency cell and hence reduce the switching loss. A 150W integrated magnetic double-frequency DC/DC converter was made based on the proposed method, which has been verified by experiments.

Keywords

• Magnetic integration inductors
• double-frequency dc/dc converter
• current shunt to reduce loss
• efficiency
• dynamic response
• gyrator-capacitor model