Capacitor-Less Buck-Boost Converter Using Integrated Planar Inductor-Capacitor Fabricated with Nanotechnology Processes

This paper presents a groundbreaking capacitorless buck-boost DC-DC converter that harnesses the inherent parasitic capacitances of discrete planar inductors, eliminating the necessity for an external capacitance. The proposed approach integrates high dielectric material-based thin films, manufactured using nanotechnology processes, into planar magnetic structures, enhancing power density. By intentionally increasing stray capacitance, the converter effectively serves as an output filter element. This study advocates for the application of calcium copper titanate (CCTO) CaCu3Ti4O12 in the design, renowned for its remarkable dielectric constant of approximately 10, 000 at room temperature. A comprehensive mathematical model for the novel converter approach, encompassing the design of the circuit parameters is presented. Moreover, this paper establishes a detailed circuit model for the new electromagnetic device, verified through Ansys Maxwell finite element analysis tool. To highlight the effectiveness of the proposed methodology, a practical buck-boost design example is presented. Through rigorous simulations, minimum inductance of 20 uH, and the combined filter capacitor C-o at 80 uF is estimated.