تبریک به دکتر حامد ملااحمدیان، عضو هیات علمی موسسه آموزش عالی خراسان به خاطر چاپ مقاله در مجله معتبر ISI ، IET Power Electronics
Hybrid Control of the DC-DC Series Resonant Converter Operating below Resonance
Author(s): Hamid Afshang ; Farzad Tahami ; Hamed Mollaahmadian
Source: IET Power Electronics, 19 pp, DOI: 10.1049/iet-pel.2015.0362, Online ISSN 1755-4543
Department of Electrical Engineering, Khorasan Institute of Higher Education, Mashhad, Iran
Abstract: Control and stabilization of the resonant converters are essential problems in power electronics. The conventional model of the dc-dc series resonant converter (SRC) is derived using the sinusoidal approximation and generalized averaging followed by linearization about an operating point. This model involves considerable approximation and is not applicable for large variation of load and supply voltage. The authors have already proposed a direct piece-wise affine (DPWA) modeling and control approach for the SRC that operates above resonant frequency. But, the DPWA technique is not applicable to a SRC that operates below resonance because of the presence of harmonics. In this paper a dynamic voltage-controlled oscillator (VCO) is introduced so that the overall system consisting of the proposed VCO following by the SRC is modeled as a piecewise affine (PWA) system. Then, a hybrid controller is designed in order to regulate the dc output voltage of the SRC operating below resonance. Also, the stability analysis of the closed-loop system is presented in the form of linear matrix inequalities. A prototype of the SRC is constructed and the proposed hybrid controller is implemented on a DSP core. The simulation and experimental results show the effectiveness of this modeling and control approach.