یک مبدل جدید بسیار بهره بالا DC/DC با عملکرد کلیدزنی نرم کامل و استرس ولتاژ کم
محورهای موضوعی : مهندسی برق قدرتسارا حسن پور 1 , آمارد افضلیان 2 , توحید نوری 3
1 - دانشکده مهندسي برق، واحد رامسر، دانشگاه آزاد اسلامی، رامسر، مازندران، ايران
2 - دانشکده مهندسي برق، واحد رامسر، دانشگاه آزاد اسلامی، رامسر، مازندران، ايران
3 - دانشکده مهندسي برق ، واحد ساری، دانشگاه آزاد اسلامی، ساری، مازندران، ايران
کلید واژه: مبدل جریان مستقیم بهرهبالا, سلف تزویجشده, جریان ورودی پیوسته, ترانس-معکوس, کلیدزنی نرم,
چکیده مقاله :
این مقاله یک مبدل جدید تکسوئیچه بسیار بهرهبالا DC-DC برای کاربردهای انرژی تجدیدپذیر ارائه میدهد. این مبدل قادر است بهره ولتاژ بالا را در سیکل وظیفه کم، ریپل جریان ورودی کم و استرس ولتاژ پایین ارائه دهد. علاوه بر این، از یک سلف تزویجشده با سه سیمپیچ برای افزایش بهره ولتاژ استفاده شده است که نشاندهنده انعطافپذیری بیشتر مبدل است. همچنین، سیمپیچ ثانویه سلف تزویجشده به صورت ترانس-معکوس عمل میکند. بنابراین در تعداد دورهای کمتر، بهرههای ولتاژ بالاتر میتواند به دست آید. یک مدار کلمپ (محدودکننده) پسیو خوداحیا انرژی نشتی سلف تزویج شده را جذب و بازیافت میکند. تک ماسفت قدرت مدار در شرایط کلیدزنی در جریان صفر با استرس ولتاژ محدود فعالیت میکند. در این مدار به دلیل عملکرد کلیدزنی نرم برای سوئیچ قدرت و دیودها، تلفات توان به میزان قابل توجهی کاهش یافته است. تجزیه و تحلیل دقیق حالت دائمی و آنالیز تلفات توان به همراه ملاحظات طراحی مهیا شده است. در نهایت، برای تایید یافتههای تئوری، یک نمونه آزمایشگاهی (200 وات، 25 ولت-400 ولت) پیادهسازی شده است. با توجه به نتایج آزمایشگاهی، راندمان مبدل پیشنهادی در حدود 96.2٪ است و حداکثر استرس ولتاژ بر سر کلید قدرت تقریبا به اندازه 15% ولتاژ DC خروجی محدود شده است.
This paper presents a new single-switch Ultra High-Gain DC/DC converter for renewable energy applications. This converter is able to provide a high voltage gain in a low-duty cycle, low input current ripple, and low voltage stress. Moreover, a coupled inductor with three windings is utilized to extend the voltage gain, which indicates more converter flexibility. Also, the secondary winding of the coupled inductor acts in a trans-inverse manner. Thus, at a lower number of turn ratios, higher voltage gains can be achieved. A regenerative passive clamp circuit absorbs and recycles the energy of the leakage energy of the coupled inductor. The single-power MOSFET operates at zero current switching conditions with restricted voltage stress. In this circuit, because of the soft-switching operation for the power switch and diodes, the power dissipations have been alleviated considerably. Detailed steady-state and power loss analyses, as well as design considerations, are provided. Finally, to confirm the given theories a sample prototype (200 W, 25 V- 400 V) is implemented. Regarding the experimental results, the proposed converter efficiency is about 96.2%, and the maximum voltage stress across the power switch is limited to about 15% output DC voltage.
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