Radial-expansion monolithic wafer type piezoelectric ceramic transformer and preparation method thereof

Abstract

The invention discloses a radial-expansion monolithic wafer type piezoelectric ceramic transformer which is composed of a laminated piezoelectric ceramic body and electrodes, wherein the laminated piezoelectric ceramic body comprises at least three radial-vibration-mode piezoelectric ceramic layers with odd-numbered layers of thin wafers. the side surface of the laminated piezoelectric ceramic body is provided with four separated side electrodes, the first and the second side electrodes are arranged in the side surface of an input top electrode arc scope, the third and the fourth electrodes are arranged in the side surface of an output top electrode arc scope; the first side electrode is connected with input inner electrodes and input top electrodes at the odd-numbered layers; the second side electrode is connected with input inner electrodes and input bottom electrodes at the even-numbered layers; the third side electrode is connected with output inner electrodes and output top electrodes at the odd-numbered layers; and the fourth side electrode is connected with output inner electrodes and an output bottom electrodes at the even-numbered layers. The piezoelectric ceramic transformer provided by the invention has the advantages of stable mechanical property, high transmitted power and conversion efficiency and good isolation effect.

Description

technical field [0001] The invention relates to a piezoelectric ceramic transformer, in particular to a radial vibration mode monolithic disc type piezoelectric ceramic transformer; the invention also relates to a preparation method of the piezoelectric ceramic transformer. Background technique [0002] Since the 1980s, great breakthroughs have been made in the research and application of piezoelectric ceramic transformers. Compared with electromagnetic transformers, they have the advantages of high boost voltage, high energy density and small chip size. Piezoelectric transformer is a transformer that is different from the traditional concept in terms of material structure and working principle. It is made of piezoelectric materials through a series of processes such as high-temperature sintering and high-voltage polarization. Lightweight, no breakdown, no fear of short circuit, high step-up ratio and other remarkable features, the small power supply made of piezoelectric tr...

AI Technical Summary

Problems solved by technology

However, the defect of this type of transformer is that once other materials are used to connect the piezoelectric ceramics, the mechanical vibration generated by the piezoelectric ceramics during the working process will be limited or the mechanical vibration will be attenuated by the action of organic materials during the transmission process.

At the same time, the structural stability of the bonded multi-layer transformers cannot be guaranteed, and the colloids are prone to drop due to vibration or premature aging during use, resulting in layered and scrapped transformers

In this way, the maximum performance of the piezoelectric ceramic transformer cannot be exerted.

[0005] In addition, the current piezoelectric transformer is basically a three-terminal autotransformer without isolation, that is, the input and output voltage of the transformer share the same ground. For example, the Rosen type piezoelectric transformer has no voltage isolation function between the input and output terminals, and the working environment is more complicated. The transmission process in many signal transmission systems such as industrial test systems, medical electronic equipment, and power equipment is very unsafe, and it is not suitable for the field of signal isolation.

At the same time, the current piezoelectric ceramic transformer basically does not have a feedback electrode setting, and a sampling signal is required for signal tracking adjustment in the self-excited circuit

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