Abstract
Zero voltage switching (ZVS) of the half bridge inverter is analyzed regarding nonlinear transistor output capacitances. A general method is described to derive an equivalent linear switch node capacitance from the transistors' CV characteristics that accurately models the commutation energy. The nonlinearity depends on device technology and can have a strong impact on the equivalent capacitance and thus, on the design of ZVS converters, particularly at high switching frequencies. The nonlinearity can be expressed by means of a co-energy factor, which is unity for linear capacitances and can be as high as eight in recent superjunction MOSFETs, whereas first data on GaN HEMTs again shows values close to unity. The model is applied to the resonant LLC converter for which the calculation of ZVS boundaries is discussed in low and high gain operation modes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.