Sumant G. Kadwane
DC–DC converter, sliding mode control, frequency domain
The most critical part in implementation of sliding mode (SM) controllers is the prediction of stability with the selected modulation technique: hysteresis or pulse width modulation (HM or PWM). Another important aspect is the determination of hitting condition to the sliding line/surface and the existence condition to remain in the vicinity of sliding line/sliding surface. In this paper the frequency domain interpretation of SM controller is presented. A very simple graphical technique that can be easily applied to higher order sliding surface is suggested using describing function approach, which gives all information regarding stability and hitting and existence conditions. In addition to this, the steady state switching frequency and amplitude of oscillations is easily obtained through the suggested technique.
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