A key consideration in spacecraft applications is the conducted and radiated electromagnetic interference (EMI) generated by electronic components. One of the biggest sources of EMI is from the power system, caused by converters rapidly switching large amounts of current and voltage that generates unwanted noise. Without significant engineering considerations of mechanical and electrical layout, EMI can have serious impacts on other spacecraft systems such as communication equipment. Isolated supplies typically use a forward or flyback converter topology with a coil wound toroidal transformer. The transformer can experience a high voltage impulse called an inductive kickback during switching due to its leakage inductance, which contributes to overall power system radiated and conducted emissions. The transformer is a major source of EMI in currently available switching forward topologies, requiring a significant amount of input filtering, snubbing, and shielding. A high efficiency, isolated, cascaded prototype utilizing resonant switching techniques was developed in the form of a Buck-LLC utilizing a traditional wire wound transformer. With the successful testing of a 200W, 1MHz, Buck-LLC converter utilizing gallium nitride (GaN) devices, a planar transformer design was desired for an improvement in overall converter efficiency and EMI performance. In this work, a new transformer winding design is presented for a planar transformer using paired Litz winding interleaving. Ansys finite element analysis (FEA) software is used to verify design parameters. The winding configuration is designed to be compatible with a standard PCB stack-up so that the transformer windings can be directly integrated into the converter PCB even further reducing leakage inductance and increasing power density.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Low EMI Planar Transformer for an Isolated, Cascaded Buck-LLC Converter


    Contributors:


    Publication date :

    2023-03-04


    Size :

    3830712 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Capacitor-Less Buck Converter Using Integrated Planar Electromagnetic Components

    Kanakri, Haitham / Dos Santos, Euzeli Cipriano / Rizkalla, Maher | IEEE | 2024


    Cascaded Converter for Large-Scale Solar-BES System with Transformer Isolation

    Karmakar, Subir / Yadav, Shivam Kumar / Singh, Bhim | IEEE | 2021



    Boost-buck converter control system

    NAKAMURA MAKOTO / FUNADA MASASHI / MORII AKIYOSHI | European Patent Office | 2016

    Free access

    Design and Analysis of Cascaded Buck-Boost Zeta (BBZ) Converter for Improved Efficiency at High Output Voltage

    Rahman, Mohammad Dehan / Kabir, Md Saif / Rabbi, Md Nazaf et al. | IEEE | 2020