طراحی و پیادهسازی مبدل رزونانسی LLC نیمپل با استفاده از تکنیک FHA
محورهای موضوعی : مبدل های الکترونیک قدرت
1 - شرکت صنایع فرزانگان زاگرس، منطقه کاوه ویلاشهر، نجف آباد، اصفهان
2 - شرکت صنایع فرزانگان زاگرس، منطقه کاوه ویلاشهر، نجفآباد، اصفهان
کلید واژه: مبدل رزونانسی LLC, مبدل نیمپل, تکنیک FHA,
چکیده مقاله :
اگرچه مبدلهای رزونانسی LLC دارای سابقه نسبتاً زیادی میباشند، اما اخیراً این مبدلها مخصوصاً با به کارگیری توپولوژی نیمپل از محبوبیت ویژه برخوردار شدهاند. در بسیاری از کاربردها مانند ATX PCها و تلویزیونهای صفحه تخت که نیازمند راندمان و توانایی انتقال چگالی توان بالایی هستند، استفاده از مبدل رزونانسی LLC نیمپل با توجه به معایب بسیار کمی که دارد، بهترین راهحل میباشد. یکی از مشکلات طراحی این مبدل، پیچیدگی روابط حاکم بر مدار و غیرخطی بودن معادلات است. در این مقاله از روش FHA به منظور تحلیل مدار استفاده شده است، که با در نظر گرفتن تنها هارمونیک اصلی از بسط فوریه ولتاژ و جریان، روشی مناسب برای به دست آوردن بهره ولتاژ مبدل ارائه میکند. سپس با استفاده از نرم افزار PSpice طراحی انجام شده شبیهسازی، و در انتها نتایج عملی مبدل ساخته شده برای توان 75 وات با راندمان حدود 93% آورده شده است. همچنین نتایج شبیهسازی تأیید کننده نتایج عملی میباشد
Although in existence for many years, only recently has the LLC resonant converters, in particular in its half-bridge implementation, gained in the popularity it certainly deserve. The advantages such as high efficiency, low level of EMI emissions, and its ability to achieve high power density are such features that suited for power supply demand of many modern applications such as ATX PCs and flat panel TVs. One of the major difficulties in concern with designing such converter is complex model and non-linear equations that cannot be easily used into a design procedure. So in this paper, design is based on the assumption that input-to-output power transfer is essentially due to the fundamental Fourier series components of currents and voltages. This technique known as First Harmonic Approximation (FHA) and is a proper method to obtain the voltage gain through solving the equivalent ac circuit of the resonant tank. The design simulated by Pspice and finally the experimental results show design procedure base on FHA technique.
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