US 2004/0201328 A1Published application

Laminated piezoelectric transformer

AssigneeFace International Corporation

InventorAlfredo Vazquez Carazo

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Abstract

A laminated piezoelectric transformer is provided using the longitudinal vibration modes for step-up voltage conversion applications. The input portions are polarized to deform in a longitudinal plane and are bonded to an output portion. The deformation of the input portions is mechanically coupled to the output portion, which deforms in the same longitudinal direction relative to the input portion. The output portion is polarized in the thickness direction relative its electrodes, and piezoelectrically generates a stepped-up output voltage.

Claims18

Dependent claims

A piezoelectric transformer, comprising:

a first input portion comprising a first electroactive layer having first and second opposing electroded major faces and first and second opposing minor faces and polarized such that upon application of voltage across said first and second opposing electroded major faces, said first electroactive layer deforms in a longitudinal direction parallel to said first and second opposing electroded major faces and perpendicular to said first and second opposing minor faces;
a second input portion comprising a second electroactive layer having first and second opposing electroded major faces and first and second opposing minor faces and polarized such that upon application of voltage across said first and second opposing electroded major faces, said second electroactive layer deforms in a longitudinal direction parallel to said first and second opposing electroded major faces and perpendicular to said first and second opposing minor faces;
an output electroactive layer having first and second opposing major faces, first and second opposing electroded minor faces, third and fourth opposing minor faces;
said output electroactive layer having a central output electrode portion between said first and second opposing electroded minor faces;
said output electroactive layer having a first output portion between said central output electrode portion and said first electroded minor face, said first output portion being polarized in a direction normal to said first electroded minor face;
said output electroactive layer having a second output portion between said central output electrode portion and said second electroded minor face, said second output portion being polarized in a direction normal to said second electroded minor face;
and
a first dielectric layer having first and second opposing major faces;
said first major face of said first dielectric layer being bonded to said first electroded major face of said first input electroactive layer;
said second major face of said first dielectric layer being bonded to said first major face of said output electroactive layer;
a second dielectric layer having first and second opposing major faces;
said first major face of said second dielectric layer being bonded to said first electroded major face of said second input electroactive layer;
said second major face of said dielectric layer being bonded to said second major face of said output electroactive layer;
wherein upon application of a voltage across said first and second electroded major faces of said first input electroactive layer, said first input portion deforms in said longitudinal direction;
and wherein upon application of a voltage across said first and second electroded major faces of said second input electroactive layer, said second input portion deforms in said longitudinal direction;
and wherein upon said longitudinal deformation of said first and second input portions, said first and second bonded dielectric layers and said output electroactive layer mechanically strain in said longitudinal direction;
and wherein said mechanical strain of said output electroactive layer in said longitudinal direction piezoelectrically generates a first output voltage between said first electroded minor face and said central output electrode portion and a second output voltage between said second electroded minor face and said central output electrode portion.

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Dependencies are inferred from the claim text.

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Abstract

A piezoelectric transformer, comprising:

a first input portion comprising a first electroactive layer having first and second opposing electroded major faces and first and second opposing minor faces and polarized such that upon application of voltage across said first and second opposing electroded major faces, said first electroactive layer deforms in a longitudinal direction parallel to said first and second opposing electroded major faces and perpendicular to said first and second opposing minor faces;
a second input portion comprising a second electroactive layer having first and second opposing electroded major faces and first and second opposing minor faces and polarized such that upon application of voltage across said first and second opposing electroded major faces, said second electroactive layer deforms in a longitudinal direction parallel to said first and second opposing electroded major faces and perpendicular to said first and second opposing minor faces;
an output electroactive layer having first and second opposing major faces, first and second opposing electroded minor faces, third and fourth opposing minor faces;
said output electroactive layer having a central output electrode portion between said first and second opposing electroded minor faces;
said output electroactive layer having a first output portion between said central output electrode portion and said first electroded minor face, said first output portion being polarized in a direction normal to said first electroded minor face;
said output electroactive layer having a second output portion between said central output electrode portion and said second electroded minor face, said second output portion being polarized in a direction normal to said second electroded minor face;
and
a first dielectric layer having first and second opposing major faces;
said first major face of said first dielectric layer being bonded to said first electroded major face of said first input electroactive layer;
said second major face of said first dielectric layer being bonded to said first major face of said output electroactive layer;
a second dielectric layer having first and second opposing major faces;
said first major face of said second dielectric layer being bonded to said first electroded major face of said second input electroactive layer;
said second major face of said dielectric layer being bonded to said second major face of said output electroactive layer;
wherein upon application of a voltage across said first and second electroded major faces of said first input electroactive layer, said first input portion deforms in said longitudinal direction;
and wherein upon application of a voltage across said first and second electroded major faces of said second input electroactive layer, said second input portion deforms in said longitudinal direction;
and wherein upon said longitudinal deformation of said first and second input portions, said first and second bonded dielectric layers and said output electroactive layer mechanically strain in said longitudinal direction;
and wherein said mechanical strain of said output electroactive layer in said longitudinal direction piezoelectrically generates a first output voltage between said first electroded minor face and said central output electrode portion and a second output voltage between said second electroded minor face and said central output electrode portion.

14 more elements