Digital voltage-mode controller for soft-switching ZVT-ON boost converter

Abstract

In this paper analysis and robust stabilizing digital controller design for a zero-voltage turn-ON boost converter (ZVTBC) is presented. The steady-state performance and zero-voltage switch-ON methodology has been analyzed and then its state-space models are formulated to obtain the small-signal models. These linearized models are then used in the design of digital voltage-mode controller. A loopgain is defined and then adapted while designing the digital controller. The digital controller is designed through redesign procedure and pole-zero placement technique. Closed-loop performance of the ZVTBC is analyzed. Firstly, the results of controller design and closed-loop analysis are illustrated through MATLAB computer simulations for 42 V applications and then verified using time-domain dynamic response analysis results. A 75 Watt, 24 to 42 V, 50 kHz laboratory prototype closed-loop converter has been and then tested to validate the proposed digital controller design of the ZVTBC.