A 48V Resonant Voltage Regulator Module with a New Current Mode Controller

This paper presents the performance and design of a new variable frequency 48V voltage regulator module (VRM) suitable for the future stand-alone microprocessor loads. Self-sustained oscillation control (SSOC) is used to achieve the output voltage regulation and high efficiency for a wide range of loading conditions. Thanks to its advantage over the traditional variable frequency (VF) operation; it has a narrower regulating frequency range to achieve zero voltage switching (ZVS). It helps reducing the component stress and thus saving the elements ratings. The converter employs synchronous rectifiers on the transformer secondary side to reduce conduction losses as well. MATLAB analytical results, PSIM simulation results, and Experimental results are presented to validate the superior features of the proposed VRM.