Second order sliding mode controlled point of load power supply

Abstract

This paper describes the implementation of a second order sliding mode (SOSM) controller for a practical point-of-load (POL) power supply with realistic values of output capacitor equivalent series resistance (ESR) and equivalent series inductance (ESL). The SOSM control presented in this paper results in fast transient responses, has a current limiting feature, supports light load operation, and achieves constant frequency steady state operation. Experimental results are given for a 2.5 V -5.5 V input, 0.6 V -1.5 V output, 3 A prototype.

Adaptive dynamic voltage transitioning in switch mode DC–DC power converters

“…• Sliding mode control that avoids inductor current saturation, but does not consider an adaptive DVT for the optimal response across different load conditions [31].…”

“…As is evident by this figure, the largest and fastest transition can only occur when i L0 is allowed to increase from 0 A to the maximum safe allowable current I Lmax . Any attempt to achieve the fastest transition from a positive load current will result in the peak inductor current exceeding I Lmax . Sliding mode control that avoids inductor current saturation, but does not consider an adaptive DVT for the optimal response across different load conditions [31]. …”