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In this paper, the electrical equivalent circuits of the piezoelectric transformer (PT) with heat transfer system (HTS) had been studied. A heat transfer model of the longitudinal vibration PT had been built and an experiment study on the equivalent circuit model of the PT with HTS was proposed. this work provides a useful information for the application of piezoelectric transformer in high-power...
This paper presents a methodology to obtain an optimized model of a Radial Piezoelectric Transformer with primary and secondary at same piezoelectric ceramic surface. Three-dimensional simulation by Finite Element Method is utilized as analysis tool. Methodology aim is obtaining an improved accuracy model for low cost Piezoelectric Transformer samples. Finite Element analysis was done in order to...
In this paper an analysis and modeling methodology of piezoelectric transformers is presented. Three-dimensional simulation by Finite Element Method is utilized to obtain the Mason lumped parameter model. The PT has been prototyped and the experimental measurements are compared with the simulations. The results show that the simulation in three-dimensional environment by Finite Element Method reveals...
A novel line monitoring methodology based on piezoelectric transformer (PT) is proposed. The frequency range of operation and magnitude levels for voltage sensing are discussed and experimental results are presented. The experimental results show that a PT sustains high input voltages at power-line frequency and steps it down while stepping up the transient high frequency tones. Hence, an unexplored...
The piezoelectric transformer (PT) as a pressurized component used in fuse all-electronic safety and arming device improves its security and reliability. The manufacturing materials and geometric parameters error of PT results in the error of the equivalent circuit model parameters. In order to effectively obtain accurate equivalent model parameters, the admittance circle is used to measure equivalent...
Power electronic circuits have traditionally been based on magnetic technology. The transformers and inductors in conventional converters are usually bulky compared to other elements. In an effort to miniaturize power components a piezoelectric, rather than a magnetic transformer could be employed in the power supplies. A single-branch equivalent circuit model can characterize all types of piezoelectric...
This paper presents the experimental modeling of a Step-Down DC/DC, thickness vibration mode type Piezoelectric Transformer (PT), intended for commercial applications. The paper includes the analysis, design and control process of a power converter topology to drive the PT. The objective is to achieve a good balance between efficiency, cost, robustness and minimization of magnetic components. The...
The paper considers the influence of high harmonic components of the square wave input voltage on the efficiency of a piezoelectric transformer (PT). The PTs are narrow-range resonant transducers designed to operate with a sinusoidal input of a given frequency. Their common applications are however the DC/DC converters, incorporated in the general class of switching power supply circuits, which are...
A novel design method - narrow control bandwidth for the PT power converter has been proposed according to the electrical characteristics and the operation features of PT. The method has been proved through the input matching network of PT. The main contributions are as follows: 1) The functions of the input matching network has been analyzed; the design method has been put forward and the parameters...
In this paper, a Cold Cathode Fluorescent (CCFL ) model for high frequency dimming electric ballast simulation is presented. The model can be utilized for an electronic ballast simulation with continues dimming and transient mode simulation such as step dimming. The model is implemented using a PSPICE. The piezoelectric transformer is evaluated using an AC equivalent analysis. We are proposes an electronic...
Cold cathode fluorescent lamp (CCFL) has been used for a source of light on LCDs, and external electrode fluorescent lamp (EEEFL), flat fluorescent lamp (FFL), field emission lamp (FEL) including LED is actively progressing application for other source of light. This paper used EEFL that has advantage for decrease inverter round figures, because is advantageous to multi lamp drive, transformer decrease...
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