Analysis in Switching Power Converter Design
Giulia Di Capua, Student Member, IEEE, and Nicola Femia, Senior Member, IEEE
Abstract—This paper discusses a novel method for the analysis
of MOSFET commutations and the investigation of related losses
and spike current issues in the switching power converter (SPC)
design. The synchronous rectification switching cell (SRSC) configuration
is considered for the investigation, which is used in the
high-frequency high-efficiency (H2 EF) SPC design. The proposed
method is aimed at providing an effective tool for quick feasibility
investigations and comparative evaluations among design solutions
using different MOSFET combinations for the design of
H2EF SPCs. The method allows us to use nonlinear models of
interelectrode MOSFET capacitances and adopts a novel numerical
technique specifically developed to solve the SRSC model ensuring
robust and fast simulations. Capacitive pulsating currents
circulating through the MOSFETs and the SPC during commutations
can be analyzed in detail by using the proposed method.
Different examples are discussed to show how MOSFETs characteristics
and operating conditions may affect switching losses,
because of the pulsing currents circulation through the SPC.
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