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With the rapid development of low power consumption electronics, wireless sensor networks (WSN) are highly investigated and used to improve our life quality. Using piezoelectric materials to transfer the mechanical energy into electrical energy for batteries of WSN in order to extend the life time is the focus in many researches in the recent years. It is important and efficient to improve the energy...
Power electronic converters based on piezoelectric transformer (PT) have been widely adopted in recent years due to their many inherent advantages such as safety, low housing profile and high power density. However, few studies have been conducted about noises emitted by PT converters. In this paper, we study conducted EMI problems in a 10 W, DC-DC PT converter. The different sources and specific...
In this paper, a new approach to the thermal management of piezoelectric transformers is proposed. Starting from the electromechanical equations, including mechanical and dielectrical losses, and knowing the piezoelectric material characteristics, an analytical model was developed and the theoretical profile of the heat sources was deduced. To check these theoretical points of view, a thermal characterization...
Piezoelectric transformers (PTs) converters show some difficulties to work in the case of the variable load at fixed frequency. PTs can be designed to achieve these problems, but the size of the PT may become larger. In fact, the selection of the circuit topologies and the control methods influence the size and the efficiency of the PT converter. Two rectifiers (half-wave rectifier and the full-wave...
Piezoelectric transformers (PT) are widely adopted in recent year due to many advantages, including safety, no EMI problem, low housing profile, and high power density, etc. The characteristics of the PT are well-known when the load impedance is a pure resistor. When PTs are used in AC/DC or DC/DC converters, there are always a rectifier circuit block connected after the PT. The rectifier circuit...
This paper presents a design and fabrication of a disk- type piezoelectric micro-transformer. The working resonance mode of transformer is flexion mode. To reduce the boundary constrain force and raise the step up ratio, the four legs were used to support the disk structure. The outer diameter of transformer is 1500 mum. The 8 mum thick PZT film and 8 mum thick silicon film constructed the body of...
The energy harvesting from ambiance to power the tiny sensor devices by MEMS generator is becoming practical due to the power consumption of low power VLSI (very large scale integration) circuits is going down to tens to hundreds muW for integrated wireless sensor devices. In this paper, we present the design and process development of a piezoelectric MEMS generator that has the ability to scavenge...
A current trend in power electronics is the integration of power supplies. In this field, electromagnetic transformers may be replaced by piezoelectric transformers (PT). In a PT, the input electrical energy is transferred to the output through a mechanical wave using the direct and converse effects of piezoelectric materials. It has been proved that PT exhibit suitable characteristic, good integration...
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