Piezoelectric transformer based on single crystal surface cutting mode

Abstract

The invention discloses a piezoelectric transformer based on single crystal surface cutting mode. The piezoelectric transformer includes a face cutting mode piezoelectric single crystal wafer having a first surface and a second surface parallel to each other. A first electrode and a second electrode that are in mutual electric insulation are arranged on the first surface. A third electrode is arranged on the second surface. The first electrode is an input electrode while the second electrode is an output electrode or the first electrode is the output electrode while the second electrode is the input electrode. When excitation signals of a certain frequency are exerted on the input electrode, k36 surface cutting mode mechanical vibration is excited from the piezoelectric single crystal wafer and energy is output from the output electrode. Compared with a piezoelectric single crystal wafer working in a K31 mode or a K33 mode, the piezoelectric transformer has a higher electromechanical coupling factor and power density, lower working frequency, lower excitation voltage and heat generation volume. The piezoelectric transformer provided by the invention is especially suitable for a compact AC / DC adapter / convertor / charger, communication equipment, a personal computer, a liquid crystal display background light source and the like.

Description

technical field [0001] The invention relates to a piezoelectric transformer, in particular to a piezoelectric transformer based on a single-crystal face-cut mode, and belongs to the technical field of energy. Background technique [0002] As a new type of electronic device, the piezoelectric transformer has the advantages of small size, no breakdown, no electromagnetic interference, simple structure, and easy mass production compared with the traditional iron-core wire-wound electromagnetic transformer. It has potential applications in compact AC / DC or DC / DC adapters / converters / chargers, communication equipment, personal computers, fluorescent lamp ballasts, portable power chargers, and LCD backlights. [0003] After searching the literature of the prior art, it was found that in 2008, Xia Dinghao applied for the patent "A Radial Vibration Piezoelectric Transformer and Its Preparation Method" (Patent Application No.: 200810118024.1) for a piezoelectric transformer based on r...

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Problems solved by technology

[0003] After searching the literature of the prior art, it was found that in 2008, Xia Dinghao applied for the patent "A Radial Vibration Piezoelectric Transformer and Its Preparation Method" (Patent Application No.: 200810118024.1) for a piezoelectric transformer based on radial vibration. In: Radial K 31 The mode electromechanical coupling efficiency is low, the volume is large and requires high driving voltage, which is easy to cause high temperature rise

Its disadvantage is that the piezoelectric transformer is also based on K 31 Mode, electromechanical coupling efficiency is low, bulky and requires high driving voltage, easy to cause high temperature rise

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