تحلیل یک مبدل سوئیچ-خازنی با قابلیت‌های تثبیت ولتاژ خروجی و کلیدزنی نرم

نوع مقاله : علمی-پژوهشی

نویسنده

دانشکده مهندسی برق و کامپیوتر- دانشگاه تربیت مدرس

چکیده

چگالی توان بالای مبدل‌های سوئیچ-خازنی ناشی از فقدان عناصر مغناطیسی است. اما، این موضوع منجربه عدم‌توانایی در تثبیت ولتاژ خروجی و کلیدزنی سخت، به‌خاطر جریان‌های لحظه‌ای بزرگ، می‌شود. این جریان‌ها سبب افزایش تلفات کلیدزنی و نویز و محدودشدن توان قابل‌پردازش می‌گردد. هرچند اخیراً با افزودن سلف‌های کوچک به ساختار برخی از مبدل‌های سوئیچ-خازنی عمل‌کرد آن‌ها بهبود یافته‌است، ولی فقط تعداد معدودی از آن‌ها توانایی تثبیت ولتاژ خروجی و کلیدزنی نرم را دارند. در این‌جا، با ترکیب یک برش‌گر فعال و یک مبدل سوئیچ-خازنی، در محدوده وسیعی از تغییرات ولتاژ ورودی و بار هر دو ویژگی تثبیت ولتاژ خروجی و کلیدزنی نرم در ادوات نیمه‌هادی قدرت حاصل شده‌است. به‌خاطر کاهش تلفات کلیدزنی و نویز می‌توان فرکانس را جهت کاهش اندازه سلف‌ها و خازن‌ها افزایش داد. این موضوع، ضمن کاهش حجم مبدل، عمل‌کرد آن را بهبود می‌بخشد، زیرا در عمل سلف‌ها و خازن‌های کوچک مشخصات فرکانس بالای مطلوب‌تری دارند. بنابراین، مبدل اصلاح‌شده در توان‌های بالا از ساختار رایج بهتر است. در این‌جا، علاوه‌بر تحلیل ریاضی، برای تثبیت یک ولتاژ خروجی V400 با وجود تغییرات وسیع ولتاژ ورودی (V100-50) و مقاومت بار (kΩ8-Ω400)، مبدل مذکور در فرکانسkHz200 شبیه‌سازی و ساخته شده‌است

کلیدواژه‌ها

عنوان مقاله [English]

Analysis of a Switched-Capacitor Converter with Output Voltage Regulation and Soft Switching Capabilities

نویسنده [English]

  • R. Beiranvand
Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

High power density of switched-capacitor converters (SCCs) is due to absent of inductive components. But, this subject leads to output voltage regulation problem and hard switching characteristics due to high current spikes, which increase switching losses and noise and limit the power rating. Although, performances of some SCCs have been improved recently by including some small inductors in their topologies, but, only few of them can regulate output voltage and have soft switching characteristics. Here, by combining an active clamp and a boost SCC, both output voltage regulation and soft switching characteristics are achieved, even when wide input voltage and load variations are applied. So, switching frequency can be increased to reduce inductors and capacitors values, due to low switching losses and noise. It reduces the converter volume and also improves its performance, because small inductors and capacitors have better high-frequency characteristics, practically. Therefore, the modified converter is practically much better than the conventional configuration, especially at high power ratings. Here, the modified converter has been analyzed, mathematically, and to verify the given analyses, it has been simulated and implemented at 200kHz for regulating a 400V output voltage, even when wide input voltage (50-100V) and load (400Ω-8kΩ) variations are applied.

کلیدواژه‌ها [English]

  • Active clamp
  • soft switching
  • switched-capacitor converter (SCC)
  • voltage regulation

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