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| Hybrid Control Strategy of Full Bridge LLC Converters |
| Li Ju, Ruan Xinbo |
| Nanjing University of Aeronautics and Astronautics Nanjing 210016 China |
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Abstract This paper proposes a novel hybrid control strategy of full bridge LLC resonant converter. The control strategy integrates the advantages of both variable frequency control and fixed frequency control. It can be easily implemented by using only one IC. Under this control strategy, full bridge LLC resonant converter can operate under both variable frequency mode and phase shift mode. All the switches can realize zero-voltage switching from nearly zero to full load without any auxiliary circuit, and the rectified diodes can achieve zero-current switching, so the voltage stress across them is only the output voltage. Moreover, the switching frequency range is relatively narrow, so the converter is very suitable for wide-input-voltage-range applications. The detail operation principles and characteristics of the converter are analyzed, and the implementation of the proposed hybrid control strategy is given and discussed. A prototype of 250-500V input, 3kW output is built to verify the effectiveness of the strategy.
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Received: 07 December 2011
Published: 25 March 2014
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2013, Vol. 28 
