Piezoelectric ceramic wafer type isolating signal transformer and manufacturing method thereof

Abstract

The invention discloses a piezoelectric ceramic wafer type isolating signal transformer and a manufacturing method thereof. The transformer comprises a piezoelectric ceramic body, an input part, an output part and an isolating part, wherein the piezoelectric ceramic body is of a wafer type; the isolating part extends to another circular surface from one circular surface of the body in the thickness direction, so that the piezoelectric ceramic body is divided into two parts, namely the input part and the output part; a first isolating strip which is covered by an electrode is formed between the input part and the output part; and the input part and the output part are provided with covered electrodes on the upper surface and the lower surface of the body. The signal transformer has a voltage isolating function, high conversion efficiency, a simple structure and a small size.

Description

technical field [0001] The invention relates to a transformer, in particular to a piezoelectric ceramic disc-type isolated signal transformer used in the field of electronic industry such as signal transmission of low-power power electronics and a preparation method thereof. Background technique [0002] Since the 1980s, great breakthroughs have been made in the research and application of piezoelectric ceramic transformers, because piezoelectric transformers have the following four advantages over electromagnetic transformers: high boost voltage, high energy density and chip type small 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 ferroelectric materials through a series of processes such as high-temperature sintering and high-voltage polarization. , light weight, no breakdown, no fear of short circuit, high step-up ratio and other remarkable features, the ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the current three-terminal autotransformer input and output share the same ground, without the voltage isolation function of the input and output terminals, it is very unsafe in the transmission process in a relatively complicated working environment, and is not suitable for the field of signal isolation; Most of the current piezoelectric transformers are transformers that vibrate in the length or amplitude direction, and the conversion efficiency of transformers that vibrate in the radial direction is not as good as that

Magnetoelectric isolation transformers basically use wire-wound transformers. Two wire-wound magnetic core transformers are needed to realize the isolation of input and output. The disadvantages are: (1) The combination of two magnetic core transformers is relatively large It meets the requirements of sheet-type development; (2) The winding process of the transformer, the transformer has many windings, and the manufacturing cost of the transformer is high; (3) The wire-wound magnetic core transformer is easy to break down, easy to short-circuit between the windings, and the isolation effect is not good ; (4) Using two wire-wound transformers for isolation reduces the transmission efficiency of the entire signal

The optocoupler has a short life, is prone to light decay, and has a high cost

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