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A PWM Plus Phase-Shift Controlled Interleaved Isolated Boost Converter Based on Semi-Active Quadrupler Rectifier for High Step-Up Applications Abstract: Semi-active quadrupler rectifiers (SAQRs) are proposed in this paper to serve as the secondary rectification circuits, which make the secondary-side voltages be controllable and help to reduce current stress and conduction losses. An interleaved isolated boost converter is developed based on the proposed SAQRs. By utilizing the pulse-width-modulation (PWM) plus phase-shift control strategy, the primary and secondary-side voltages are well matched to reduce the current values and circulating conduction losses. With the proposed SAQRs, the voltage gain is extended and the voltage stresses on power devices and passive components used in rectification circuits are reduced to the half of the high output voltage. Hence, the efficiency is improved by using a transformer with a smaller turns ratio and reduced parasitic parameters, and by employing low voltage rating devices with better switching and conduction performance. With optimal design, lower voltage and current stresses on the primary-side switches, minimized input current ripple can be realized. Moreover, the zero-voltage turn on switching of the active switches and the zero-current turn off switching of the diodes can be achieved over a wide load and voltage range by the proposed SAQR based converter and the control strategy. Meanwhile, the higher voltage gain, and the lower voltage and current stresses on power devices can be obtained with the proposed SAQR based converter compared with passive quadrupler rectifier based converter. The feasibility and effectiveness of the proposed SAQRs and the derived converter are verified by a 380V output prototype. Existing system: POWER systems sourced by renewable energy sources and batteries have been becoming the effective solutions to compensate the global energy shortage and environmental problems. Commonly the two stage configuration constructed by a front-end DC-DC converter and a grid-connected inverter is widely used, due to the low output voltages of these renewable energy sources and batteries. Hence, the high step-up voltage conversion ratio is required for the DC-DC stage to convert the low voltages into a sufficiently high voltage for the inverter. Proposed system: In the proposed system, the concept of semi-active quadrupler rectifiers (SAQRs) are proposed to alleviate the limitations of the current-fed converter. These SAQRs are derived by replacing the diodes in rectification circuits by active switches or by adding the extra bidirectional switch. The major contribution is to propose the novel interleaved isolated boost converter by employing the SAQRs. Lower voltage stresses on the primaryside switches and lower current stresses on the secondary-side rectification circuit have been achieved for the proposed SAQR based converter compared with those with passive rectifiers. Circuit diagram: Reference: [1] E. P. I. Association. (2012). Global Market Outlook for Photovoltaics Until 2016 [Online]. Available: http://www.epia.org/index.php?eID=tx_ nawsecuredl&u=0&file=/uploads/tx_epiapublications/Global-Market-O utlook2016.pdf&t=1361899900&hash=b68ff7952d2e057c16e2fc50bd af112b52b809b4 [2] P. V. Tech. (2012). Report: Solar Fastest Growing Renewable in US to 2040 [Online]. Available: http://www.pv-tech.org/news/report_solar_fast est_growing_renewable_in_us_to_2040 [3] U. R. Prasanna, and A. K. Rathore, “Extended Range ZVS Active-Clamped Current-Fed Full-Bridge Isolated DC/DC Converter for Fuel Cell Applications: Analysis, Design, and Experimental Results,” IEEE Trans. Ind. Electron., vol. 60, no. 7, pp. 2661-2672, Jul. 2013. [4] J. Lee, Y. Jeong, and B. Han, “An Isolated DC/DC Converter Using HighFrequency Unregulated LLC Resonant Converter for Fuel Cell Applications,” IEEE Trans. Ind. Electron., vol. 58, no. 7, pp. 2926-2934, Jul. 2011.