Abstract :
In this paper, an electromechanical model for disk-type piezoelectric transformer (PT) is proposed based on Hamilton´s principle. To establish the model, vibration characteristics of the piezoelectric disk with free boundary conditions are analyzed in advance. Based on the vibration analysis results of the piezoelectric disk, operating frequency and vibration mode of the PT are chosen. Then, an electromechanical model for the PT was obtained, which can be used to simulate the coupled electromechanical system for the transformer, such as voltage step-up ratio, input impedance, output impedance, input power, output power, and efficiency. Thus, the optimal load resistance and the maximum efficiency for the PT have been calculated in this paper.
Keywords :
equivalent circuits; piezoelectric devices; transformers; Hamilton principle; disk-type piezoelectric transformer; electromechanical model; equivalent circuits; free boundary conditions; input impedance; input power; optimal load resistance; output impedance; output power; piezoelectric disk; vibration analysis; vibration characteristics; voltage step-up ratio; Industrial electronics;
