T. Nishimura, Y. Adachi, Y. Ohta, K. Higuchi, E. Takegami, S. Tomioka, K. Jirasereeamornkul, K. Chamnongthai
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Robust digital control for an LLC current-resonant DC-DC converter
If a pulse frequency, a load resistance of an LLC current-resonant DC-DC converter are changed, the dynamic characteristics is varied greatly, that is, the LLC current-resonant DC-DC converter has non-linear characteristics. In many applications of DC-DC converters, loads cannot be specified in advance, and they will be changed suddenly from no loads to full loads. A DC-DC converter system used a conventional single controller cannot be adapted to change dynamics and it occurs large output voltage variation. In this paper, a robust digital controller for suppress the change of step response characteristics and variations of output voltages in the load sudden changes is proposed. Experimental studies using a micro-processor for the controller demonstrate that this type of digital controller is effective to suppress the variations.
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