Design and Implementation of Half-Bridge LLC Resonant Converter by FHA Technique

Subject Areas : Power electronics converters

Navid  Salehi ¹ (Farzanegan Zagros Industries Co., Najafabad, Esfahan)
Majid  Dehghani ² (Farzanegan Zagros Industries Co., Najafabad, Esfahan)

Received: 2015-01-01 Accepted : 2015-04-24 Published : 2015-04-21

Keywords: LLC resonant converter, half-bridge converter, FHA technique,

Abstract :

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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