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Composite piezoelectric transformer

  • US 6,366,006 B1
  • Filed: 12/15/2000
  • Issued: 04/02/2002
  • Est. Priority Date: 12/15/2000
  • Status: Expired due to Term
First Claim
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1. A piezoelectric transformer, comprising:

  • a first input portion having a first thickness, said first input portion further comprising;

    a first input ceramic layer having first and second opposing electroded major faces and polarized in a direction parallel to an axis normal to said first and second opposing major faces; and

    a first input terminal adjacent said first major face of said first input ceramic layer;

    a second input portion having a second thickness, said second input portion further comprising;

    a second input ceramic layer having first and second opposing electroded major faces and polarized in a direction parallel to said axis; and

    a second input terminal adjacent said first major face of said second input ceramic layer; and

    an output portion having a third thickness, said output portion further comprising;

    a first output ceramic layer having first and second opposing electroded major faces and polarized in a direction parallel to said axis;

    a second output ceramic layer having first and second opposing electroded major faces and polarized in a direction parallel to said axis;

    an output terminal adjacent said first major face of said first output ceramic layer and said first face of said second output ceramic layer;

    a first common terminal adjacent said second major face of said first output ceramic layer and said second major face of said first input ceramic layer; and

    a second common terminal adjacent said second major face of said second output ceramic layer and said second major face of said second input ceramic layer;

    wherein upon application of a first oscillating voltage across said first input terminal and said first common terminal, said first input ceramic layer alternatingly expands and contracts in said direction parallel to said axis;

    and wherein upon application of a second oscillating voltage across said second input terminal and said second common terminal, said second input ceramic layer alternatingly expands and contracts in said direction parallel to said axis;

    and wherein said expansion and contraction of said first and second input ceramic layers in said direction parallel to said axis causes a first oscillating mechanical strain of said first and second output ceramic layers parallel to said axis;

    and wherein said first oscillating mechanical strain of said first and second output ceramic layers piezoelectrically generates a third oscillating voltage between said first and second faces of each of said first and second output ceramic layers.

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