Скачать или смотреть Novel Approach to Reduce Planar Transformers Parasitic

Paper Title: A Novel Approach of Planar Transformer Configuration for Reducing Parasitic Capacitances and Enhancing Resonant Converters Parameters
Authors names: 1- Haitham Kanakri. 2- Euzeli Cipriano Dos Santos, Jr. 3- Maher Rizkalla
Affiliation: Purdue School of Engineering and Tecnology (IUPUI), Indianapolis, USA

Abstract:
This paper proposes reducing parasitic capacitances by changing the winding connections of planar transformers without changing either the copper surface area of the traces or layout configuration. The proposed strategy indicates that minimizing the voltage gradient among layers surface will reduce the electrostatic energy stored across the device and consequently the parasitic capacitances. The study presents a comprehensive comparison of different configurations for series, parallel and hybrid winding connections, considering leakage inductances, winding resistances and parasitic capacitances that makes the results closer to a practical transformer. Parallel configuration showed significant reduction of intrawinding parasitic capacitance of 91.42% compared to the series configurations which has the highest intrawinding parasitic capacitance. When used in resonant converters the hybrid winding connection showed similar performance to the parallel winding connection in terms of less transformer secondary voltage distortion. The LLC resonant converter has been used to verify the performance of the three winding layouts. Finite element analysis (FEA) results are presented to validate the proposed solution.