Apparatus for producing a plasma and hand-held device having the apparatus
First Claim
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1. An apparatus for producing a plasma which can be ignited at atmospheric pressure, comprising:
- a printed circuit board;
a control circuit embodied within said printed circuit board, which circuit is electrically connected to a piezoelectric transformer, to excite said piezoelectric transformer, wherein said piezo electric transformer comprises a fixed first end mounted to said printed circuit board; and
a free second end, said control circuit operatively arranged to impress a high voltage on said second free end of the piezoelectric transformer and to control a fan to create a current of a working gas for forming the plasma and for cooling the piezoelectric transformer, wherein;
the piezoelectric transformer is constructed from a plurality of layers of dielectric material, wherein the layers are connected to each other, each layer is provided at least partially with a conductor layer and the piezoelectric transformer is freely spaced apart from the printed circuit board by a gap in the region of the first end; and
an electrical connector is guided from the printed circuit board to each lateral face of the piezoelectric transformer and is connected to each terminal pad, which is provided at a vibrational nodal point on each lateral face of the piezoelectric transformer, wherein the vibrational nodal point is closer to the first end than to the second free end of the piezoelectric transformer.
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Abstract
An apparatus for producing a plasma including a control circuit which is electrically connected to a piezoelectric transformer in order to excite the piezoelectric transformer. A hand-held device that uses the apparatus. The piezoelectric transformer is constructed of several layers. The control circuit is implemented on a circuit board, and the piezoelectric transformer is held over the circuit board by means of a region of a first end. A high voltage is applied to a second free end of the piezoelectric transformer. The plasma is produced at atmospheric pressure.
29 Citations
14 Claims
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1. An apparatus for producing a plasma which can be ignited at atmospheric pressure, comprising:
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a printed circuit board; a control circuit embodied within said printed circuit board, which circuit is electrically connected to a piezoelectric transformer, to excite said piezoelectric transformer, wherein said piezo electric transformer comprises a fixed first end mounted to said printed circuit board; and
a free second end, said control circuit operatively arranged to impress a high voltage on said second free end of the piezoelectric transformer and to control a fan to create a current of a working gas for forming the plasma and for cooling the piezoelectric transformer, wherein;the piezoelectric transformer is constructed from a plurality of layers of dielectric material, wherein the layers are connected to each other, each layer is provided at least partially with a conductor layer and the piezoelectric transformer is freely spaced apart from the printed circuit board by a gap in the region of the first end; and an electrical connector is guided from the printed circuit board to each lateral face of the piezoelectric transformer and is connected to each terminal pad, which is provided at a vibrational nodal point on each lateral face of the piezoelectric transformer, wherein the vibrational nodal point is closer to the first end than to the second free end of the piezoelectric transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hand-held device for plasma treatment of surfaces, said hand-held device comprising:
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a housing; a voltage source; a printed circuit board, which is provided in the housing and which has a control circuit in order to excite a piezoelectric transformer wherein the piezoelectric transformer is guided with a first end with a holder above the printed circuit board and, thus, forms a structural unit, and wherein a second free end of the piezoelectric transformer is directed towards an opening in the housing, wherein a high voltage can be impressed on the second free end of the piezoelectric transformer, and the plasma can be ignited at atmospheric pressure; a working gas for forming the plasma and for cooling the piezoelectric transformer; wherein the piezoelectric transformer is constructed from a plurality of layers of dielectric material, wherein the layers are connected to each other; and wherein each layer is provided at least partially with a conductor layer and the piezoelectric transformer is freely spaced apart from the printed circuit board by a gap in a region of the first end; and
,an electrical connector is guided from the printed circuit board to each lateral face of the piezoelectric transformer and is connected to each terminal pad, which is provided at a vibrational nodal point on each lateral face of the piezoelectric transformer, wherein the vibrational nodal point is closer to the first end than to the second free end of the piezoelectric transformer. - View Dependent Claims (12, 13, 14)
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Specification