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Sampled-data modeling and digital control of resonant converters

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3 Author(s)
M. E. Elbuluk ; Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA ; G. C. Verghese ; J. G. Kassakian

A sampled-data model to describe the dynamics of large signals and of small perturbations away from a cyclic steady state is developed. Associated transfer functions are obtained. The application of the model is illustrated by correlating the analysis with simulation results obtained for a series resonant DC/DC power converter. A discrete-time microprocessor-based controller, designed using the aforementioned dynamic model, has been built and tested using a simulation for a series-resonant DC/DC converter set up on the Massachusetts Institute of Technology Parity Simulator. The control methods implemented are state feedback and periodic output feedback, each designed to achieve a specified set of closed-loop poles. The controller has been implemented using the Parity Simulator generalized controller. Results of the closed-loop response showed an improvement over the open-loop response. In addition, the effect of the microprocessor computation delay on the closed-loop dynamics of the converter is investigated.<>

Published in:

IEEE Transactions on Power Electronics  (Volume:3 ,  Issue: 3 )