Output Voltage Overshoot Reduction Techniques for Cascade Buck-Boost Converters

This study proposes a switching control strategy to reduce overshoot caused by load variations in a bidirectional Cascade buck-boost converter operating in boost mode. To achieve this, the cause of overshoot that occurs when the load decreases is analyzed, which is found to be due to the magnitude of the voltage applied to the inductor, which is the difference between the input and output voltages. The proposed switching control strategy ensures that only the output voltage is applied to the inductor. The proposed method reduces overshoot by about 55%, from 42V to 19V, and this has been verified through simulation.