Piezoelectric ceramic transformer

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Patent

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Details

310358, 310366, 310369, H01L 4108

Patent

active

052784711

ABSTRACT:
A piezoelectric ceramic transformer includes a high impedance portion having internal electrode layers which are opposite each other in a thickness direction in a radial central portion of a piezoelectric ceramic disc; an annular insulating portion disposed externally of the high impedance portion and having no electrode; and a low impedance portion disposed externally of the annular insulating portion and having annular internal electrode layers which are opposite each other in a thickness direction, the internal electrode layers of the high impedance portion being exposed on the side end face of the piezoelectric ceramic disc at respective ends thereof without being in contact with the annular internal electrode layer of the low impedance portion and being alternately connected on the side end face with external electrodes, each of which is connected with an electric terminal, and the internal electrode layers of the low impedance portion being exposed on the side end face of the piezoelectric ceramic disc at respective ends thereof and being alternately connected on the side end face with external electrodes, each of which is connected with an electric terminal. The transformer is operable in a high frequency band and can be used for an onboard power supply.

REFERENCES:
patent: 2974296 (1961-03-01), Rosen
patent: 3271622 (1966-09-01), Malagodi et al.
patent: 4564782 (1986-01-01), Ogawa
patent: 4742264 (1988-05-01), Ogawa

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