Simplified Σ-Δ modulation controller for interleaved boost DC-DC converter suitable for renewable energy applications

It is generally accepted that interleaving techniques are efficient at reducing the input/output ripples and increasing the power output of boost converters operating in the critical conduction mode. Pulse width modulation (PWM) is commonly used to produce the switching pattern. But this technique causes large switching noise peaks at a multiple number of the carrier frequency. This paper proposes Interleaved Boost DC-DC converter suitable for renewable energy applications. The proposed converter utilises a simplified delta-sigma modulation to control the pulse generator. A thorough and effective analysis of the converter is carried out in order to achieve the required system stability and to improve the dynamic performance. The output response characteristics obtained by this method is very much improved compared to the conventional PWM method of control. Simulation results are presented to illustrate the advantages of the proposed scheme. All the advantages of interleaving, such as higher efficiency and reduced ripple for voltage/current, are also maintained in the proposed converter.