A novel approach for synchronized switch damping control based on voltage sources in parallel

Abstract

This paper presents a novel hybrid model, termed Synchronized Switch Damping with Voltage Sources in Parallel (SSDVP), for enhancing the performance of synchronized switch damping (SSD) control by addressing the flipping voltage and voltage drop issues in piezoelectric elements. The effectiveness of SSD control is closely related to the voltage applied to the piezoelectric element. However, at high voltages, such as the maximum capacity of 1.5 kV for piezoelectric materials, charge leakage becomes significant and cannot be ignored. This results in substantial voltage drop during switching intervals, particularly in low-frequency applications. The proposed SSDVP method combines the advantages of SSDI and Bang-bang control to generate a stable high voltage across the piezoelectric element with minimal power consumption. The working principle and mathematical model of the SSDVP method are described, including the expression of the voltage across the piezo patch and the energy consumption of the control circuit. Simulation and experimental comparisons are conducted among the traditional SSDV model, Bang-bang control, and the proposed SSDVP model to demonstrate the advantages of the novel approach.