A Powerful Switching Frequency Limitation in Sliding Mode Control

This paper deals with a new analog system which limits the switching frequency in sliding mode control. This analog process consists in adding a second order filter, just before the relay function. It is possible to get a very fast dynamics and a behavior similar to the one predicted by the sliding mode theory. This investigated method is involved in a voltage power supply, which can be used as Uninterruptible Power Supply, with bandwidth greater than 2000Hz. In short, the investigated frequency control method requires a simple analog filter and offers to the users an accurate tracking of the reference signal with a very high robustness.