Book Synopsis Next Generation Power Factor Correction (PFC) Regulator Based on Silicon Carbide (SiC) Power Devices and New Control Strategy by :
Download or read book Next Generation Power Factor Correction (PFC) Regulator Based on Silicon Carbide (SiC) Power Devices and New Control Strategy written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As information and semiconductor technologies continue to develop, power supplies for applications such as telecommunications and computer systems are required to have higher power ratings, smaller volumes, and higher transfer efficiencies. The PFC stage, a key component of distributed power systems present in the front end of AC/DC converters, is an excellent target for increasing the power density and efficiency of the power supply, as it contains several large passive components. However, conventional commercial PFC designs are constrained by several limitations that prevent them from achieving the desired high power densities and efficiencies. In this dissertation, multiple techniques have been investigated to improve the power density and power efficiency of PFC boost converters. For a Continuous Conduction Mode (CCM) PFC converter, increasing the switching frequency at which the converter operates can dramatically reduce the volume of the boost inductor, while the EMI filter size can be reduced if the switching frequency is higher than 400kHz. To achieve high frequency operation, cutting edge SiC power devices are promising candidates for implementation into CCM PFC converters operating at switching frequencies into the MHz range due to their small on-state resistance and junction capacitance. Theoretical analysis and experimental results prove that extremely high power density can be obtained in a single phase 1MHz CCM PFC converter with SiC power devices, however, this converterâ€"! efficiency falls short of the 95% efficiency target. A good compromise between high power density and power efficiency is achieved by employing multiphase interleaving architecture and SiC power devices simultaneously. This dissertation proposes novel nonlinear control architecture to simplify the controller design of multiphase interleaved CCM PFC regulators. PFC converters operating in Critical Mode (CRM) achieve high power efficiency by employing soft switching techniques, but.