Piezoelectric Ceramic Transformer for Power Supply Operating in Thickness Extensional Vibration Mode

Osamu OHNISHI; Yasuhiro SASAKI; Toshiyuki ZAITSU; Hiromi KISHIE; Takeshi INOUE

Piezoelectric Ceramic Transformer for Power Supply Operating in Thickness Extensional Vibration Mode

Osamu OHNISHI, Yasuhiro SASAKI, Toshiyuki ZAITSU, Hiromi KISHIE, Takeshi INOUE

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This paper presents a new sort of multilayer piezoelectric ceramic transformer for switching regulated power supplies. This piezoelectric transformer operates in the second thickness extensional vibration mode. Its resonant frequency is higher than 1 MHz. First, numerical simulation was implemented using a distributed constant electromechanical equivalent circuit method. It was calculated that this piezoelectric transformer, which has higher than 200 mechanical quality factor Q_m, could work with higher than 90% efficiency and in more than 20-W/cm³ high power density. Second, a trially fabricated transformer, which is 15 mm long, 15 mm wide and 2.2 mm thick, was examined. Modified PbTiO₃ family ceramics were used for the piezoelectric transformer material, because of the large anisotropy between electromechanical coupling factors k_t and k_p. Obtained results indicate that the piezoelectric transformer has good resonant characteristics, with little spurious vibration, and exhibits 16-W/cm³ power density with high efficiency at 2 MHz. Moreover, a switching regulated power supply, applying the piezoelectric ceramic transformer, was built and examined.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E77-A No.12 pp.2098-2105

Publication Date: 1994/12/25

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Type of Manuscript: PAPER

Category: Ultrasonics

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Osamu OHNISHI, Yasuhiro SASAKI, Toshiyuki ZAITSU, Hiromi KISHIE, Takeshi INOUE, "Piezoelectric Ceramic Transformer for Power Supply Operating in Thickness Extensional Vibration Mode" in IEICE TRANSACTIONS on Fundamentals, vol. E77-A, no. 12, pp. 2098-2105, December 1994, doi: .
Abstract: This paper presents a new sort of multilayer piezoelectric ceramic transformer for switching regulated power supplies. This piezoelectric transformer operates in the second thickness extensional vibration mode. Its resonant frequency is higher than 1 MHz. First, numerical simulation was implemented using a distributed constant electromechanical equivalent circuit method. It was calculated that this piezoelectric transformer, which has higher than 200 mechanical quality factor Q_m, could work with higher than 90% efficiency and in more than 20-W/cm³ high power density. Second, a trially fabricated transformer, which is 15 mm long, 15 mm wide and 2.2 mm thick, was examined. Modified PbTiO₃ family ceramics were used for the piezoelectric transformer material, because of the large anisotropy between electromechanical coupling factors k_t and k_p. Obtained results indicate that the piezoelectric transformer has good resonant characteristics, with little spurious vibration, and exhibits 16-W/cm³ power density with high efficiency at 2 MHz. Moreover, a switching regulated power supply, applying the piezoelectric ceramic transformer, was built and examined.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e77-a_12_2098/_p

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@ARTICLE{e77-a_12_2098,
author={Osamu OHNISHI, Yasuhiro SASAKI, Toshiyuki ZAITSU, Hiromi KISHIE, Takeshi INOUE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Piezoelectric Ceramic Transformer for Power Supply Operating in Thickness Extensional Vibration Mode},
year={1994},
volume={E77-A},
number={12},
pages={2098-2105},
abstract={This paper presents a new sort of multilayer piezoelectric ceramic transformer for switching regulated power supplies. This piezoelectric transformer operates in the second thickness extensional vibration mode. Its resonant frequency is higher than 1 MHz. First, numerical simulation was implemented using a distributed constant electromechanical equivalent circuit method. It was calculated that this piezoelectric transformer, which has higher than 200 mechanical quality factor Q_m, could work with higher than 90% efficiency and in more than 20-W/cm³ high power density. Second, a trially fabricated transformer, which is 15 mm long, 15 mm wide and 2.2 mm thick, was examined. Modified PbTiO₃ family ceramics were used for the piezoelectric transformer material, because of the large anisotropy between electromechanical coupling factors k_t and k_p. Obtained results indicate that the piezoelectric transformer has good resonant characteristics, with little spurious vibration, and exhibits 16-W/cm³ power density with high efficiency at 2 MHz. Moreover, a switching regulated power supply, applying the piezoelectric ceramic transformer, was built and examined.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Piezoelectric Ceramic Transformer for Power Supply Operating in Thickness Extensional Vibration Mode
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2098
EP - 2105
AU - Osamu OHNISHI
AU - Yasuhiro SASAKI
AU - Toshiyuki ZAITSU
AU - Hiromi KISHIE
AU - Takeshi INOUE
PY - 1994
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E77-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 1994
AB - This paper presents a new sort of multilayer piezoelectric ceramic transformer for switching regulated power supplies. This piezoelectric transformer operates in the second thickness extensional vibration mode. Its resonant frequency is higher than 1 MHz. First, numerical simulation was implemented using a distributed constant electromechanical equivalent circuit method. It was calculated that this piezoelectric transformer, which has higher than 200 mechanical quality factor Q_m, could work with higher than 90% efficiency and in more than 20-W/cm³ high power density. Second, a trially fabricated transformer, which is 15 mm long, 15 mm wide and 2.2 mm thick, was examined. Modified PbTiO₃ family ceramics were used for the piezoelectric transformer material, because of the large anisotropy between electromechanical coupling factors k_t and k_p. Obtained results indicate that the piezoelectric transformer has good resonant characteristics, with little spurious vibration, and exhibits 16-W/cm³ power density with high efficiency at 2 MHz. Moreover, a switching regulated power supply, applying the piezoelectric ceramic transformer, was built and examined.
ER -