Driving frequency optimization of a piezoelectric transducer and the power supply development.
Piezoelectric transducers are commonly operated at their resonance frequency. However, from a power dissipation standpoint, this is not the ideal driving frequency. In this paper, an optimized driving frequency in between the resonance and antiresonance frequencies is proposed for the piezo-transducer. First, the optimum driving frequency is characterized using a constant vibration velocity measurement method. The actual input power reveals the lowest power dissipation frequency between the resonance and the antiresonance frequencies, where the transducer behaves inductive. The electrical parameters of the transducer are then determined by an equivalent circuit formulation, which is useful for the electrical circuit analysis of the driver design. A Class E resonant inverter is used to design a capacitive output impedance driver at the optimized frequency by utilizing a series capacitor. Compared with the traditional resonance drive, driving at the optimized frequency reduces the required power by approximately half according to the measurements performed.
School of Electrical Engineering, Southeast University, Nanjing 210096, China.
Xiaoxiao
X
Dong
International Center for Actuators and Transducers, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Tao
T
Yuan
School of Electrical Engineering, Southeast University, Nanjing 210096, China.
Minqiang
M
Hu
International Center for Actuators and Transducers, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Husain
H
Shekhani
Honda Electronics Co., Ltd., Toyohashi, Aichi 441-3193, Japan.
Yuichi
Y
Maida
Honda Electronics Co., Ltd., Toyohashi, Aichi 441-3193, Japan.
Tonshaku
T
Tou
International Center for Actuators and Transducers, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Kenji
K
Uchino