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Multi-loop controller for wide operating range single-ended primary inductor DC/DC converter

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2 Author(s)
K. M. Tsang ; Dept. of Electr. Eng., Hong Kong Polytech. Univ., Kowloon, China ; W. L. Chan

A novel controller based on the decoupling of single-ended primary inductor converter (SEPIC) state-space averaging model to four simple first-order systems is proposed. Instead of designing a single controller for a fourth-order SEPIC converter, four PI controllers are designed for the four decoupled systems. Combining the four PI controllers with the four decoupled systems forms a multi-loop feedback control system which is able to work at a wider operating condition. Circuit implementation of the proposed controller is presented and experimental results are included to demonstrate the effectiveness of the proposed design scheme.

Published in:

IET Power Electronics  (Volume:4 ,  Issue: 8 )