طراحی و پیاده‌سازی یک مبدل DC-DC رزنانسی سوئیچینگ نرم جدید نوع کاهنده
محورهای موضوعی : انرژی های تجدیدپذیر
آرزو نوربهشت
1
(کارشناس ارشد - دانشکده مهندسی برق، واحد نجفآباد، دانشگاه آزاد اسلامی، نجفآباد، ایران)
مسعود جباری
2
(استادیار - دانشکده مهندسی برق، واحد نجفآباد، دانشگاه آزاد اسلامی، نجفآباد، ایران)
کلید واژه: سوئیچینگ نرم, ZCS, مبدلهای سوئیچ رزناتور, مبدل کاهنده, تلفات سوئیچینگ,
چکیده مقاله :
در این مقاله یک مبدل جدید DC-DC کاهنده رزنانسی از خانواده مبدلهای سوئیچ رزناتور (SwRC) ارائه شده است که شرایط سوئیچینگ نرم از نوع ZCS برای هر دو سوئیچ هم در گذار روشن شدن و هم در گذار خاموش شدن فراهم آمده است. از اینرو تلفات سوئیچینگ کاهش یافته و قابلیت افزایش فرکانس سوئیچینگ جهت ارتقاء چگالی توان مبدل فراهم گردیده است. تعداد المانهای بکار رفته در این مبدل پایین است و لذا صرفه اقتصادی خواهد داشت. همچنین دیود رزنانس در شرایط ZCS خاموش شده از اینرو پدیده بازیافت معکوس که خصوصا در دیودهای نوع سریع مشکل زا است مرتفع می گردد. به منظور فراهم کردن شرایط سوئیچینگ نرم برای تمام المانهای نیمه هادی، شبکه رزنانس LC مورد استفاده قرار گرفته است. نتایج شبیه سازی این مبدل با نرم افزار PsPice و نتایج ساخت آزمایشگاهی در این مقاله ارائه شده است. راندمان بدست آمده برای این مبدل %92.32 می باشد.
This paper presents a new step-down resonant dc-dc converter derived from the family of Switched-Resonator converters (SwRC). Soft-switching conditions are provided for both switches at turn on and turn off transitions by switching under zero-current (ZCS). ZCS technique switching losses and enables the converter to operate at higher switching frequencies which enhances the converter power density. Moreover, it gives better efficiency with few element count and decrease the implementation cost. Due to the turning-off of the resonant diode under ZCS condition, the problem of reverse recovery which is a problematic issue especially in fast diodes is obviated. By employing a simple LC resonant network, soft-switching condition is provided for all the semi-conductor devices. The circuit is simulated by PSpice software and the results are presented. Experimental results from a laboratory prototype are also presented. Simulation and practical results confirm integrity of the presented theoretical analysis and show the full-load efficiency at 92.32%.
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