ارائه یک مبدل غیر ایزوله بسیار افزاینده با کلیدزنی نرم و تعداد المان کمکی کم

محورهای موضوعی : انرژی های تجدیدپذیر

شکوه شعبانی ¹ , مجید دلشاد ² , رامتین صادقی ³

1 - دانشکده فنی مهندسی- واحد خوراسگان، دانشگاه آزاد اسلامی، خوراسگان، اصفهان، ایران
2 - دانشکده فنی مهندسی- واحد خوراسگان، دانشگاه آزاد اسلامی، خوراسگان، اصفهان، ایران
3 - دانشکده فنی مهندسی- واحد خوراسگان، دانشگاه آزاد اسلامی، خوراسگان، اصفهان، ایران

تاریخ دریافت : 1400/03/24 تاریخ پذیرش : 1400/07/15 تاریخ انتشار : 1400/07/01

کلید واژه: مدولاسیون پهنای پالس, کلیدزنی نرم, بسیار افزاینده, گذر-ولتاژ-صفر,

چکیده مقاله :

در این مقاله، یک مبدل غیر ایزوله بسیار افزاینده جدید با کلیدزنی نرم ارائه شده است. یک مدار کمکی با حداقل تعداد المان به مبدل پیشنهادی اضافه شده که شرایط کلیدزنی نرم را برای کلیه المان های نیمه هادی فراهم می نماید، لذا مشکل بازیابی معکوس دیودها را برطرف و تلفات کلیدزنی و هدایتی کلیدها را کاهش می دهد. همچنین، در مبدل پیشنهادی تنها از یک هسته مغناطیسی استفاده شده که موجب کاهش مقاومت مسی سیم پیچ ها می گردد، در نتیجه راندمان مبدل پیشنهادی در مقایسه با مبدل بوست متداول بهبود یافته است. همچنین برای پایداری ولتاژ خروجی مبدل در سطح دلخواه در لحظه های تغییر بار، از کنترل کننده انتگرالی تناسبی استفاده شده و نتایج شبیه سازی آن با نرم افزار متلب ارائه شده است. برای اثبات تحلیل های تئوری کلیدزنی نرم، یک نمونه آزمایشگاهی 250 واتی پیاده سازی گردیده و نتایج عملی آن ارائه شده است.

چکیده انگلیسی:

In this paper, a new soft switched non-isolated high step-up DC-DC converter is proposed. An auxiliary circuit with minimum number of elements is added to the converter to provide the soft switching conditions for all the semiconductors solving the reverse recovery problem of the diodes, and reducing the conduction and the switching losses of the power switches. Moreover, there is only one magnetic core used in the converter decreasing the copper resistance; thus, the power losses and the electromagnetic interference of the converter is reduced so the efficiency of the proposed converter compared to the conventional hard switched boost converter, is improved. Further, in order to adjust the output voltage of the proposed converter to the desired value under the load variations, a PI controller has been applied to the output of the proposed converter and its operation is simulated by MATLAB. In order to verify the theoretical analysis of the soft switching operations, a 250W prototype is implemented and its experimental results are provided.

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