Ternary system relaxation ferroelectric monocrystal piezoelectric transformer having high power density

Abstract

The invention provides a ternary system relaxation ferroelectric monocrystal piezoelectric transformer having the high power density, the monocrystal piezoelectric transformer comprises a piezoelectric element, and a material of the piezoelectric element is lead magnesium niobate-lead indium niobate-lead titanate monocrystalline. The ternary system relaxation ferroelectric monocrystal piezoelectric transformer provided in the invention has the advantages of the small volume, the light weight and simple manufacture; the power density of a current piezoelectric transformer can be obviously improved, and requirements of micromation and integration of related information processing equipment are met; and the ternary system relaxation ferroelectric monocrystal piezoelectric transformer is a power device having simple structure and excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the field of electricity and relates to a transformer, in particular to a ternary relaxation ferroelectric single crystal piezoelectric transformer with high power density. Background technique [0002] With the urgent need for miniaturization and integration of electronic information processing equipment and the maturity of drive circuits, transformers have expanded from the high-voltage field (usually low power) to the field of power electronic devices such as AC / DC and DC / DC conversion. Power electronic devices are required to be able to achieve greater power output in a smaller volume, and the preparation of new transformers with high power density has become a research hotspot in recent years. [0003] A piezoelectric transformer is an electronic component that realizes voltage rise and fall through impedance transformation based on the piezoelectric coupling effect. Compared with the traditional electromagnetic transform...

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Problems solved by technology

[0008] Studies have shown that on the basis of binary system PMN-PT single crystals, the introduction of indium (In) elements to prepare ternary system relaxor ferroelectric single crystals PMN-PIN-PT can make the single crystal coercive field from 2-3kV / cm increases to above 5kV / cm, the depolarization temperature increases to above 100°C, and the mechanical quality factor of the single crystal also increases. The ternary system relaxor ferroelectric single crystal PMN-PIN-PT has been used in ultrasonic sensors , but so far no relevant reports on transformers have been found

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