JP2007208012A - Piezoelectric transformer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piezoelectric transformer device which is capable of being reduced in floor space area even when it is composed of two or more piezoelectric transformers, improving its packages in packaging density, suitable for a size reduction of an apparatus, and capable of reducing its noises. <P>SOLUTION: The piezoelectric transformer device is capable of being reduced in its floor space area, improving its packaged parts in packaging density, and becoming conducive to a size reduction in an apparatus by stacking up a first and a second piezoelectric transformers which are opposite to each other in output phase, back to back with each other in one piece. Next, the vibrations of the first and second piezoelectric transformers in operation are set opposite to each other in phase, whereby the vibrations of the piezoelectric transformers cancel out each other, and noises can be prevented from occurring. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a piezoelectric transformer device that uses a piezoelectric ceramic as an element that generates a high voltage and an element that converts a voltage, and is used in a power supply device.

  Conventionally, as shown in FIG. 6, this type of general piezoelectric transformer body is provided with primary-side electrodes 101a and 101b on the upper and lower surfaces of one half of the piezoelectric ceramic 100, respectively, and the outer end of the other half. The secondary side electrode 102 is provided in the part, and the primary side lead wires 103a and 103b and the secondary side lead wire 104 are connected to the primary side electrodes 101a and 101b and the secondary side electrode 102, respectively. Configured.

  The piezoelectric transformer body is housed in a box-shaped case 105 having an open bottom as shown in FIG.

  A primary-side terminal 105a and a secondary-side terminal 106a are provided below the appropriately-shaped terminal portion a formed at an appropriate position on the outer surface of the case 105, and the primary-side lead wire 101a of the piezoelectric transformer body. 101b, the secondary lead wire 104 is pulled out from a notch (not shown) formed in the case and connected to the terminals 105a and 106a to constitute the piezoelectric transformer 106.

  The piezoelectric transformer 106 is incorporated in a substrate (not shown) together with other electronic elements so as to constitute a predetermined power supply circuit. In this case, a plurality of piezoelectric transformers may be mounted on the substrate.

  For mounting a plurality of piezoelectric transformers on a substrate, for example, as shown in FIG. 8, a piezoelectric transformer device of a type in which two piezoelectric transformers 106 are juxtaposed in a wide case 107 has been proposed. FIG. 8 is a plan view of the case.

JP-A-2004-319718 exists as this piezoelectric transformer device.
JP 2004-319718 A

  However, the structure in which the two piezoelectric transformers 106 are stored side by side in a horizontal direction requires a floor area of the substrate, and there are problems in increasing the density of mounted components and downsizing the device.

  The present invention has been proposed in view of the above, and the object of the present invention is to reduce the floor area even in the case of a plurality of piezoelectric transformers, to increase the density of mounted parts and to reduce the size of equipment. It is an object of the present invention to provide a piezoelectric transformer device that is suitable and has reduced noise.

The invention described in claim 1 is characterized in that the first and second piezoelectric transformers having output phases opposite to each other are stacked and integrated back to back.
According to a second aspect of the present invention, in the piezoelectric transformer device according to the first aspect, the polarization directions of the power generation units of the first and second piezoelectric transformers are opposite to each other, and the polarization directions of the output units are the same. One end of the AC power supply is connected to one primary side terminal of one piezoelectric transformer, the other end of the AC power supply is connected to the other primary side terminal of the second piezoelectric transformer, and the other end of the first piezoelectric transformer is connected. The primary terminal of the second piezoelectric transformer and one primary terminal of the second piezoelectric transformer are connected, and the outputs from the secondary sides of the first and second piezoelectric transformers have opposite phases.
According to a third aspect of the present invention, in the piezoelectric transformer device according to the first aspect, the first and second piezoelectric transformers use the same polarization direction in the power generation unit and the output unit, and the first and second piezoelectric transformers. An AC power source is connected to each primary side electrode of the transformer, inputs having opposite phases are added, and outputs from the respective secondary sides have opposite phases.
According to a fourth aspect of the present invention, in the piezoelectric transformer device according to the first, second, or third aspect, a bump having a cushioning property is provided between the first and second piezoelectric transformers.

According to the first to third aspects of the invention, in addition to being able to save space, the vibrations generated when driving the first and second piezoelectric transformers stacked back to back are in opposite phases to each other. Are canceled out, and generation of sound can be prevented.
According to the invention of claim 4, since the bump having cushioning properties is provided between the first and second piezoelectric transformers, mutual interference can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the present invention, as shown in FIGS. 1 (a) and 1 (b), two first and second piezoelectric transformers A and A ′ having vibrations generated when driving each piezoelectric transformer in opposite phases are stacked back to back. And is integrated to cancel out vibrations and prevent the generation of sound.

  2A is a plan view of the first piezoelectric transformer A used in the present invention, FIG. 2B is a bottom view, FIG. 2C is a side view, and FIG. 2D is a view from the direction of arrow a in FIG. (E) is a left end view as seen from the direction of arrow b in FIG. (C), and (f) is a cross-sectional view taken along line XX in FIG.

  In these drawings, reference numeral 1 denotes a first case made of an insulating resin having an open bottom, and the first piezoelectric transformer body 2 is accommodated therein.

  The first case 1 includes a flat plate 3 that is horizontally long when viewed from the top and a rib-like peripheral wall 4 surrounding the periphery, and in the illustrated state, one end of the left end surface 5 of the peripheral wall 4 1st terminal support part 6 for primary side lead wire connection of this is projected, and the 1st primary side terminal to which one primary side lead wire is connected to the lower part of this 1st terminal support part 6 7 is provided.

  Further, a second terminal support portion 9 for connecting the other primary side lead wire projects from the left end surface 5 side of the one side surface 8 of the peripheral wall 4, and is provided below the second terminal support portion 9. Is provided with a second primary terminal 10 to which the other primary lead is connected. A lead wire guide projection 12 for projecting a lead wire drawn to the outside is provided near the second terminal support portion 9, that is, slightly on the right end surface 11 side and at the lower portion of the peripheral wall 4. Yes.

  Further, a first terminal support portion 13 for connecting a secondary lead wire projects from the right end surface 11 side of one side surface 8 of the peripheral wall 4, and a first terminal for connecting a secondary lead wire is provided below the first terminal support portion 13. A secondary side terminal 14 is provided.

  Two lead wire guide protrusions 19 and 20 are provided so as to protrude from the left end face 15 side of the other side surface of the peripheral wall 4. These lead wire guiding protrusions 19 and 20 are used for routing the lead wire to the first primary terminal 7.

  On the side of the right end surface 11 of one side surface 8 of the peripheral wall 4, a notch 22 for drawing out a secondary lead wire is formed.

  The first piezoelectric transformer body 2 is housed and fixed in the peripheral wall 4. As shown in FIG. 2 (f), this is fixed to the inner surface side of the flat plate 3 of the first case 1 using an adhesive 21 at the node portion. Such fixing means are well known in the art.

  The first piezoelectric transformer body 2 has a rectangular plate-like piezoelectric ceramic 23, primary electrodes 24a and 24b provided on one half of the upper and lower surfaces of the piezoelectric ceramic 23 by printing, and ends of the other half. And a secondary electrode 25 provided on the part by printing. The basic configuration of the first piezoelectric transformer main body 2 is almost the same as that shown in FIG. 6 and is well known.

  In the state shown in the drawing, one end of a second lead wire 27b is connected to a substantially central portion of the other primary electrode 24b corresponding to the lower surface side via a solder 26, and this second lead wire 27b is connected to one side surface 8 side. The other end portion of the second lead wire 27b is soldered to the second primary terminal 10 provided at the lower portion of the second terminal support portion 9. Connected by attaching.

  One end of the first lead wire 27a is connected to the substantially central portion of one primary electrode 24a located on the inner surface side of the flat plate 3 by soldering (not shown). The other end is routed through the lead wire guide protrusions 19 and 20 provided on the other side 15 side, and is connected to the first primary terminal 7 provided on the left end surface 5 side by soldering. ing.

  One end of a secondary lead wire 28 is connected to the secondary electrode 25 provided at the end of the piezoelectric ceramics 23, and the secondary lead wire 28 is formed on the side of the right end surface 11 of one side 8. The first piezoelectric transformer A is formed in this way by being pulled out through the notch 22 and connected to the first secondary terminal 14 provided on the same side surface 8 side by soldering. Yes.

  The structures of the first and second primary terminals 7, 10 and the first secondary terminal 14 to which the lead wires 27a, 27b, 28 are connected are of a surface mount type. Each of these terminals is provided at the lower part of the peripheral wall 4 of the first case 1, and the mounting surface of the lower surface is substantially in the same position.

  The first piezoelectric transformer A is configured as described above.

  Since the second piezoelectric transformer A 'is configured in the same manner as the first piezoelectric transformer A, the corresponding members are indicated by adding "' (dash)" to the same reference numerals. Then, the upper surfaces of the first and second cases 1 and 1 'of the first and second piezoelectric transformers A and A' are stacked so as to face each other, that is, stacked and integrated back to back to form a piezoelectric transformer device. ing.

  Prior to the integration, the first piezoelectric transformer A and the second piezoelectric transformer A ′ are separated from each other. Therefore, before the combination, the characteristics can be measured independently, and the characteristics are inspected. Then, a predetermined performance can be obtained by combining the first piezoelectric transformer A and the second piezoelectric transformer A ′. After combining, it becomes difficult to match each characteristic. The characteristics of the first and second piezoelectric transformers A and A 'have characteristics such as the same output impedance, the same input impedance, and the same step-up ratio.

  As the first and second piezoelectric transformers A and A ', output waveforms having different phases by 180 ° are used. In this way, vibrations with different phases of 180 ° are overlapped to cancel the vibrations and prevent the generation of sound.

  That is, when a voltage having a natural resonance frequency determined by the length direction of the piezoelectric ceramic is applied to the primary electrode of the piezoelectric transformer, the piezoelectric ceramic mechanically vibrates due to the inverse piezoelectric effect, and a voltage corresponding to the vibration is taken out from the secondary side. be able to. During the vibration, the vibration propagates to the case to generate vibration noise (abnormal noise). The fact that the outputs of the first and second piezoelectric transformers A and A 'are in opposite phases means that the vibrations of the piezoelectric transformers A and A' are also in opposite phases. For this reason, mutual vibrations are canceled out, and generation of sound can be prevented.

  FIG. 3 shows a connection example of the first and second piezoelectric transformers A and A ′.

  One end of the AC power supply E is connected to one primary electrode 24a of the first piezoelectric transformer A, and the other end of the AC power supply E is connected to the other primary electrode 24b 'of the second piezoelectric transformer A'. is doing. Further, the other primary side electrode 24b of the first piezoelectric transformer A is connected to one primary side electrode 24a 'of the second piezoelectric transformer A'. In addition, although the polarization directions of the output portions of the first and second piezoelectric transformers A and A ′ are the same, the power generation between the primary electrodes 24a and 24b of the first piezoelectric transformer A is performed in order to set the output phases opposite to each other. The polarization direction of the primary electrodes 24a ′ and 24b ′ of the second piezoelectric transformer A ′ is reversed with respect to the polarization direction of the part. When the first and second piezoelectric transformers A and A 'are driven, outputs of opposite phases can be taken out from the secondary sides 25 and 25' of the piezoelectric transformers A and A 'via resistors R and R'. In this case, if the piezoelectric transformers A and A ′ are integrated back to back, the piezoelectric transformers A and A ′ overlap vibrations having different phases by 180 °, so that the vibrations can be canceled and the generation of sound can be prevented. it can.

  FIG. 4 shows another connection example. In this example, the first and second piezoelectric transformers A and A ′ have power generation units and output units that are polarized in the same direction as indicated by arrows, and are used as primary electrodes of the first piezoelectric transformer A. AC power supplies E and E ′ are connected to primary electrodes 24a ′ and 24b ′ of 24a and 24b and the second piezoelectric transformer A ′, respectively, so that inputs of opposite phases are applied to each other. Also in this case, the piezoelectric transformers A and A 'have vibrations having different phases by 180 °, and the vibrations are canceled out, so that the generation of sound can be prevented.

  FIG. 5 shows an example in which the first and second cases 1 and 1 ′ of the first and second piezoelectric transformers A and A ′ are integrated with each other through an adhesive means B. A silicone adhesive is used as the bonding means. In this way, mutual displacement can be prevented. Alternatively, it is preferable to use cushion-type bumps such as silicone resin or rubber resin because interference can be prevented in addition to preventing mutual displacement.

(A) is a side view of the basic configuration of the piezoelectric transformer device according to the present invention, and (b) is an end view of the piezoelectric transformers A and A ′ viewed from the A and A ′ directions. (A) is a plan view of the first piezoelectric transformer A, (b) is a rear view, (c) is a side view, (d) is an end view as viewed from the direction b in (c), and (e) is ( c) End view as seen from direction a in the figure, (f) shows a cross-sectional view along line XX in (a). One connection example of each piezoelectric transformer is shown. The other example of a connection of each piezoelectric transformer is shown. (A) is a side view of an embodiment of the present invention, and (b) is an end view. The perspective view of the conventional general piezoelectric transformer main body. The perspective view of the conventional piezoelectric transformer. The schematic plan view of the piezoelectric transformer apparatus which arranged two piezoelectric transformer main bodies in parallel in the conventional case is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st case 2 1st piezoelectric transformer main body 3 Flat plate 4 Perimeter wall 5 Left end surface 6 1st terminal support part 7 1st primary side terminal 8 One side surface 9 of a peripheral wall 2nd terminal support part 10 2nd Primary side terminal 11 Right end surface 12 Lead wire guide protrusion 13 First terminal support portion 14 for connecting secondary side lead wire First secondary terminal 15 for connecting secondary side lead wire The other of the peripheral wall Side 19 Lead wire guide protrusion 20 Lead wire guide protrusion 21 Adhesive 22 Notch 23 Piezoelectric ceramics 24a One primary electrode 24b The other primary electrode 25 Secondary electrode 26 Solder 27a First lead wire 27b Second Lead wire 28 Secondary lead wire A First piezoelectric transformer A ′ Second piezoelectric transformer

Claims (4)

  A piezoelectric transformer device characterized in that first and second piezoelectric transformers having output opposite phases are stacked and integrated back to back.   2. The piezoelectric transformer device according to claim 1, wherein the first and second piezoelectric transformers have a power generation unit in which the polarization directions of the power generation units are opposite to each other and the output unit has the same polarization direction. One end of the AC power supply is connected to the secondary side terminal, the other end of the AC power supply is connected to the other primary side terminal of the second piezoelectric transformer, and the other primary side terminal of the first piezoelectric transformer is connected to the second side terminal. A piezoelectric transformer device characterized in that one of the primary terminals of the piezoelectric transformer is connected and the outputs from the secondary sides of the first and second piezoelectric transformers have opposite phases.   2. The piezoelectric transformer device according to claim 1, wherein the first and second piezoelectric transformers have the same polarization direction in the power generation unit and the output unit, and each of the primary side electrodes of the first and second piezoelectric transformers is used. A piezoelectric transformer device characterized in that an AC power supply is connected, inputs having opposite phases are applied, and outputs from the respective secondary sides are in opposite phases.   4. The piezoelectric transformer device according to claim 1, wherein bumps having cushioning properties are provided between the first and second piezoelectric transformers.

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