An Efficient Switching Frequency Limitation Process Applied to a High Dynamic Voltage Supply

This paper presents the analysis and design of a simple and effective switching frequency limitation process with sliding mode synthesis. The control scheme is based on self-oscillating phenomenon which naturally appears in relay feedback systems. Thanks to an analytical study, it shows that the maximum switching frequency of a sliding mode structure can always be limited by adding a simple second order filter in the feedback loop. To illustrate the implementation and the validity of this process, it is applied to a high dynamic voltage supply with a bandwidth of 2000 Hz and with a maximum switching frequency of 15 kHz. According to the experimental results, the switching frequency limitation process shows similar robustness properties to those of sliding mode control when the load and voltage supply change.