Non-Linear Capacitance of Si SJ MOSFETs in Resonant Zero Voltage Switching Applications Escudero, Manuel Kutschak, Matteo Alessandro Fontana, Nico Rodríguez Santiago, Noel Morales Santos, Diego Pedro Hard-switching Non-linear capacitance Resonant converter Wide band gap Zero voltage switching The parasitic capacitances of modern Si SJ MOSFETs are characterized by their non-linearity. At high voltages the total stored energy Eoss(VDC) in the output capacitance Coss(v) differs substantially from the energy in an equivalent linear capacitor Coss(tr) storing the same amount of charge. That difference requires the de nition of an additional equivalent linear capacitor Coss(er) storing the same amount of energy at a speci c voltage. However, the parasitic capacitances of current SiC and GaN devices have a more linear distribution of charge along the voltage. Moreover, the equivalent Coss(tr) and Coss(er) of SiC and GaN devices are smaller than the ones of a Si device with a similar Rds;on. In this work, the impact of the nonlinear distribution of charge in the performance and the design of resonant ZVS converters is analyzed. A Si SJ device is compared to a SiC device of equivalent Coss(tr), and to a GaN device of equivalent Coss(er), in single device topologies and half-bridge based topologies, in full ZVS and in partial or full hard-switching. A prototype of 3300 W resonant LLC DCDC converter, with nominal 400 V input to 52 V output, was designed and built to demonstrate the validity of the analysis. 2020-11-19T11:14:41Z 2020-11-19T11:14:41Z 2020-07-02 journal article Escudero, M., Kutschak, M. A., Fontana, N., Rodriguez, N., & Morales, D. P. (2020). Non-Linear Capacitance of Si SJ MOSFETs in Resonant Zero Voltage Switching Applications. IEEE Access, 8, 116117-116131. [DOI: 10.1109/ACCESS.2020.3004440] http://hdl.handle.net/10481/64345 10.1109/ACCESS.2020.3004440 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España IEEE Inst Electrical Electronics Engineers Inc