| Abstract |
This paper focuses on the practical implementation of sliding mode control (SMC) in a half-wave zero current switching quasi-resonant Buck converter. SMC can manipulate efficiently the nonlinear phenomena that appear in switch mode power supplies, furthermore SMC is less affected by
disturbances compared to other control techniques, and it is not
operating at a constant switching frequency. Since half wave zero
current switching quasi-resonant Buck converter is not operating
at a constant switching frequency and it is sensitive to dynamic
variation, SMC is selected in this paper as a control technique.
An explanation of the implementation of SMC, and selecting its parameters is given. A detailed mathematical analysis is
performed in order to select the appropriate values of the tank
components elements. The tank inductor value is assumed to be
small and constant, and a range of tank capacitor values is obtained. The prototype of an analog sliding mode control for the converter is constructed. In order to study the effect of SMC on the converter behavior, the system is tested in the steady state and under different load value conditions. The obtained graphs show that the performance of SMC is good, even under the worst load conditions, i.e. no load and full load. |
