ABSTRACT:
This
paper deals with the design and simulation of full bridge LLC resonant converter
suitable for photovoltaic applications. LLC converter has several desired
features such as high efficiency, low electromagnetic interference (EMI) and
high power density. This paper provides a detailed practical design aspect of
full bridge LLC resonant converter. The LLC converter is implemented with a
full-bridge on the primary side and a fu l-bridge rectifier on the secondary
side. It includes designing the transformer turns ratio and selecting the
components such as resonant inductor, resonant capacitor and magnetizing inductor.
Also performance parameters such as voltage gain and output voltage ripple are
calculated. Simulation of LLC resonant converter is carried out using MATLAB /
SIMULINK and the results are verified.
KEYWORDS:
1. LLC
resonant converter
2. Output voltage ripple
3. Voltage
gain
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.
1: Simulink diagram of full bridge LLC resonant converter
EXPECTED SIMULATION RESULTS:
Fig.
2: Driving pulse of MOSFET Q1&Q3, current and voltage waveforms
Fig.
3: Driving pulse of MOSFET Q2&Q4, current and voltage waveforms
Fig. 4: Output voltage of inverter & current through resonant components
Fig.
5: Transformer primary and secondary voltages
Fig.
7: Output ripple voltage waveform
CONCLUSION:
The
design procedure of Full Bridge LLC Resonant Converter is presented for
photovoltaic application. Theoretical values of resonant component values are calculated
using the design equations. Simulation results are provided for LLC Resonant
converter for an input voltage of 33V. The voltage gain and output voltage ripple
of LLC resonant converter is calculated which shows that the ripple is less in
the proposed converter.
REFERENCES:
1. Abramovitz, A. and S. Bronshtein, 2011. A design methodology
ofresonant LLC DC-DC converter’ Power Electronics and Applications (EPE2011), Proceedings
of the European Conference, pp: 1-10.
2.
Bing Lu, Wenduo Liu, Yan Liang, F.C. Lee and J.D. Van Wyk, 2006.Optimal design
methodology for LLC resonant converter’, Applied Power Electronics Conference
and Exposition. Twenty-First Annual IEEE, 6: 19-23.
3.
Choi, H.S., 2007. Design consideration of half bridge LLC resonant converter,
Journal of Power Electronics, 7(1): 13-20.
4.
Gopiyani, A. and V. Patel, 2011. A closed-loop control of high power LLC
Resonant Converter for DC-DC applications, Nirma University International Conference,
pp: 1-6.
5.
Senthamil, L.S., P. Ponvasanth and V. Rajasekaran, 2012. Design and
implementation of LLC resonant half bridge converter’ Advances in Engineering, Science
and Management (ICAESM), International Conference, pp: 84-87.
