Performance comparison between PWM and SSDM techniques in interleaved boost converter

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 critical conduction mode. This paper gives performance comparison between two famous techniques used to drive power switches; pulse width modulation (PWM) and simplified sigma delta modulation (SSDM). The control strategy of the first converter is based on a voltage mode-controlled Pulse Width Modulation (PWM) with a Proportional-Integral-Derivative (PID) controller. Pulse width modulation (PWM) is used to produce the switching pattern. But this technique causes large switching noise peaks at a multiple number of the carrier frequency. The second converter is use SSDM control loop, the output response obtained by this method is very much improved compared to the conventional PWM method of control. Simulation results are provided to illustrate the advantages of the SSDM method and controller scheme. All the advantages of interleaving, such as higher efficiency and reduced ripple for voltage/current, are also achieved.