KR20160125110A - Piezoelectric transfomer - Google Patents

Piezoelectric transfomer Download PDF

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Publication number
KR20160125110A
KR20160125110A KR1020150055859A KR20150055859A KR20160125110A KR 20160125110 A KR20160125110 A KR 20160125110A KR 1020150055859 A KR1020150055859 A KR 1020150055859A KR 20150055859 A KR20150055859 A KR 20150055859A KR 20160125110 A KR20160125110 A KR 20160125110A
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South Korea
Prior art keywords
piezoelectric
input
piezoelectric element
electrode
output
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KR1020150055859A
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Korean (ko)
Inventor
정인화
오동성
김희욱
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주식회사 솔루엠
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Priority to KR1020150055859A priority Critical patent/KR20160125110A/en
Publication of KR20160125110A publication Critical patent/KR20160125110A/en

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    • H01L41/107—
    • H01L41/044—
    • H01L41/08—

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Abstract

Provided is a piezoelectric transformer capable of bilaterally changing voltage with a simple configuration. According to an embodiment of the present invention, the piezoelectric transformer comprises: a first piezoelectric transformation unit including a first input piezoelectric element connected to a first electrode, and a first output piezoelectric element connected to a second electrode; and a second piezoelectric transformation unit including a second output piezoelectric element connected to the first electrode, and a second input piezoelectric element connected to the second electrode.

Description

[0001] PIEZOELECTRIC TRANSFORMER [0002]

The present invention relates to a piezoelectric transformer.

In small electronic devices such as portable devices, power supply technology is an issue of high density and high efficiency.

To achieve this high density and high efficiency, power supply technology is increasing the switching frequency. This is because the higher the switching frequency, the smaller the size of elements such as a transformer.

However, such a high density increases the EMI noise due to the switching frequency.

On the other hand, a piezoelectric transformer is an element that converts input electrical energy into electrical energy through mechanical energy, and has the following advantages as compared with a wire-type electromagnetic type transformer.

Since winding is unnecessary, it can be made compact, thin, and lightweight, and productivity can be improved in mass production. In addition, high-efficiency operation is possible because there is no magnetic loss such as vortical hand or hysteresis hand generated in the wire-wound transformer during high frequency operation. Furthermore, since there is no step of converting into magnetic energy in the energy conversion process as in the case of the winding type, it is very advantageous in terms of electromagnetic induction failure.

Korean Patent Publication No. 2006-0057642 Korean Patent Publication No. 1998-0012653

According to an embodiment of the present invention, there is provided a piezoelectric transformer having a simple configuration and capable of voltage change in both directions.

A piezoelectric transformer according to an embodiment of the present invention includes: a first piezoelectric transducer including a first input piezoelectric element connected to a first electrode and a first output piezoelectric element connected to a second electrode; And a second piezoelectric transducer including a second output piezoelectric element connected to the first electrode and a second input piezoelectric element connected to the second electrode.

The piezoelectric transformer according to the embodiment of the present invention has a simple configuration and has an effect of enabling the voltage to be changed in both directions.

Further, they may have different input / output transforming ratios in the forward and backward transforming operations.

1 is a block diagram showing a piezoelectric transformer according to an embodiment of the present invention.
2 is a configuration diagram showing a piezoelectric transformer according to another embodiment of the present invention.
3 is a perspective view schematically showing a piezoelectric transformer included in a piezoelectric transformer according to an embodiment of the present invention.
4 is a cross-sectional view taken along line A-A 'in Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment.

Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

1 is a block diagram showing a piezoelectric transformer according to an embodiment of the present invention.

Referring to FIG. 1, the piezoelectric transformer according to the present embodiment may include a first piezoelectric transformer 100 and a second piezoelectric transformer 200.

The first piezoelectric transducer 100 may include a first input piezoelectric element 113 connected to the first electrode 10 and a first output piezoelectric element 123 connected to the second electrode 20, The second piezoelectric transformer 200 may include a second output piezoelectric device 223 connected to the first electrode 10 and a second input piezoelectric device 213 connected to the second electrode 20.

The first piezoelectric transducer 100 receives the input voltage applied to the first electrode 10 and receives the input voltage to the first electrode 10 through the first input piezoelectric element 113 and the first output piezoelectric element 123 The input voltage may be transformed and output to the second electrode 20.

The second piezoelectric transducer 200 receives the input voltage applied to the second electrode 20 and receives the input voltage applied to the second electrode 20 through the second input piezoelectric element 213 and the second output piezoelectric element 223. [ 20 may be transformed and output to the first electrode 10.

Accordingly, the piezoelectric transformer according to the embodiment of the present invention can transform a voltage applied to the first electrode 10 with a simple configuration and output the voltage to the second electrode 20, The voltage applied to the first electrode 10 can be changed.

That is, the piezoelectric transformer is capable of changing the voltage in both directions.

Hereinafter, a specific configuration and operation of the first piezoelectric transducer 100 as one embodiment will be described with reference to FIGS. 3 and 4. FIG.

FIG. 3 is a perspective view schematically showing a piezoelectric transformer included in a piezoelectric transformer according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line A-A 'of FIG.

3 and 4, the second piezoelectric transforming unit 200 has a configuration and an operation corresponding to the first piezoelectric transforming unit 100, which will be described below, It shall not be duplicated.

3 and 4, the first piezoelectric transformer 100 is a transformer using a piezoelectric effect. The transformer 100 may include an input unit 110 and an output unit 120. According to an embodiment, the piezoelectric transformer 100 may further include an insulating layer 140.

The input unit 110 may include a first input piezoelectric element 113 and input electrodes 111 and 112. Input electrodes 111 and 112 may be formed on both sides of the first input piezoelectric element 113 to apply an input voltage.

The output section 120 may include a first output piezoelectric element 123 and output electrodes 121 and 122. The output electrodes 121 and 122 may be formed on both sides of the first output piezoelectric element 123 to output an output voltage, respectively.

The first input piezoelectric element 113 and the first output piezoelectric element 123 may be a laminate in which a plurality of piezoelectric layers are laminated. Inside the plurality of piezoelectric layers, an intersection internal electrode may be formed, and these internal electrodes may be connected to the output electrodes, respectively, according to the polarity.

The polarization directions of the first input piezoelectric element 113 and the first output piezoelectric element 123 may be different from each other. For example, the polarization direction of the input piezoelectric element 113 may be formed in the thickness direction, and the polarization direction of the output piezoelectric element 123 may be the longitudinal direction.

When an input voltage having a resonant frequency is applied to the first input piezoelectric element 113, the first input piezoelectric element 113 can generate physical energy, and the first output piezoelectric element 123 can generate physical energy, It is possible to output electric energy by using the physical energy of the first electrode 113.

According to the above-described example, since the polarization direction of the first input piezoelectric element 113 is the thickness direction, when the input voltage is applied, the first input piezoelectric element 113 can vibrate in the thickness direction. Such vibration can be transmitted as vibration in the longitudinal direction to the adjacent first output piezoelectric element 123, and the first output piezoelectric element 123 can output the secondary output voltage using this longitudinal vibration.

The magnitude of the secondary side output voltage according to the primary side input voltage can be determined according to the degree of coupling between the first input piezoelectric element 113 and the first output piezoelectric element 123. [ Therefore, the output on the first output piezoelectric element 123 side, that is, the output voltage on the secondary side, may correspond to a transformed voltage (hereinafter, referred to as a 'transformed voltage').

In one embodiment, the first piezoelectric transformer 100 may further include an insulating layer 140 between the input 110 and the output 120. The insulating layer 140 may be made of various materials as an insulating material. For example, the insulating layer 140 may be formed of a ceramic material having high insulating properties.

The insulating layer 140 may be formed in the form of a sheet or film made of a resin.

In one embodiment, the insulating layer 140 is insulating and a thin film having flexibility at the same time can be used. This is because when the insulating layer 140 is formed of a ceramic material, fatigue due to vibration is increased, so that the insulating layer 140 may be cracked or broken. Or the vibration of the input unit 110 may not be smoothly transmitted to the output unit 120 due to the rigidity of the ceramic material.

In one embodiment, at least one hollow may be formed within the insulating layer 140. Since the hollow is filled with air or is formed as an empty space in a vacuum state, the input unit 110 and the output unit 120 can be electrically separated from each other through the hollow.

As the hollow is formed, the insulating layer 140 significantly reduces the actual volume of the insulating layer 140, and transmits the vibration to the output unit 120 efficiently while minimizing the attenuation of the vibration of the input unit 110 with a minimum area .

1, a piezoelectric transformer according to an embodiment of the present invention includes a first piezoelectric transformer 100 and a second piezoelectric transformer 200 connected in parallel between a first electrode and a second electrode .

The first input piezoelectric element 113 included in the first piezoelectric transformer 100 may be supplied with an input voltage and the first output piezoelectric element 123 included in the first piezoelectric transformer 100 may receive the input voltage, Voltage can be provided.

The second input piezoelectric element 213 included in the second piezoelectric transformer 200 can receive an input voltage and the second output piezoelectric element 223 included in the second piezoelectric transformer 200 May provide a transformed voltage.

Specifically, when an input voltage having the first resonance frequency is applied to the first input piezoelectric element 113, the first output piezoelectric element 123 provides the transformed voltage according to the input / output voltage ratio corresponding to the first resonance frequency .

When the input voltage having the second resonance frequency is applied to the second input piezoelectric element 213, the second output piezoelectric element 223 can provide the transformed voltage according to the input / output voltage ratio corresponding to the second resonance frequency have.

The first resonant frequency of the first piezoelectric transformer 100 and the second resonant frequency of the second piezoelectric transformer 200 may be different from each other.

Also, the first piezoelectric transforming unit 100 and the second piezoelectric transforming unit 200 may have different input / output transforming ratios.

2 is a configuration diagram showing a piezoelectric transformer according to another embodiment of the present invention.

The configuration corresponding to the piezoelectric transformer described in Fig. 1 is not described redundantly.

Referring to FIG. 2, the piezoelectric transformer according to the present embodiment may include a first piezoelectric transformer 100 and a second piezoelectric transformer 200.

The first piezoelectric transducer 100 may include a first input piezoelectric transducer 113 and a first output piezoelectric transducer 123 and the second piezoelectric transducer 200 may include a second output piezoelectric transducer 223 And a second input piezoelectric element 213,

The first piezoelectric transformer 100 may include an insulating layer 140 formed between the first input piezoelectric device 113 and the first output piezoelectric device 123 and the second piezoelectric transformer 200 may include an insulating layer 240 formed between the second input piezoelectric element 213 and the second output piezoelectric element 223. [

The piezoelectric transformer may include a selection signal terminal 30 and may include a switching element 300 that is switching controlled in accordance with a selection signal CS1 input to the selection signal terminal 30. [

The switching element 300 is connected to the second electrode 20 and the first output piezoelectric element 123 or to the second electrode 20 and the second input piezoelectric element 213, .

2, the switch element 300 is disposed on the second electrode 20 side. However, the piezoelectric transformer may include a switch element located on the first electrode 10 side.

The switch element located on the side of the first electrode 10 connects the first electrode 10 and the first input piezoelectric element 113 according to the selection signal CS1, And to connect the second output piezoelectric element 223.

This eliminates mutual interference that may occur when an input voltage is applied to the first piezoelectric transforming unit 100 and the second piezoelectric transforming unit 200 at the same time.

The piezoelectric transformer further includes a capacitor C1 connected between the first electrode 10 and the first piezoelectric transformer 100 and the second piezoelectric transformer 200 for DC voltage block And may include a capacitor connected between the second electrode 20 and the first piezoelectric transforming unit 100 and the second piezoelectric transforming unit 200.

The piezoelectric transformer may include a capacitor at all the positions mentioned above for the purpose of DC voltage block (DC Block), and the capacitor may be a multi layer ceramic capacitor (MLCC).

The piezoelectric transformer according to one embodiment of the present invention includes a first piezoelectric transformer 100 connected in a forward direction (first electrode to second electrode direction) as described above, and a second piezoelectric transformer 100 connected in parallel with the first piezoelectric transformer 100 And a second piezoelectric transducer 200 connected in a reverse direction (from the second electrode to the first electrode).

Therefore, it has an effect that voltage can be changed in both directions with a simple structure.

In addition, the first piezoelectric transforming unit 100 and the second piezoelectric transforming unit 200 can have different resonant frequencies and can have different input / output transforming ratios, so that the degree of freedom of design can be increased.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: first electrode
20: Second electrode
100: a first piezoelectric transforming portion
113: first input piezoelectric element
123: first output piezoelectric element
200: second piezoelectric transforming portion
213: second input piezoelectric element
223: second output piezoelectric element
300: Switch element

Claims (17)

A first piezoelectric transducer including a first input piezoelectric element connected to the first electrode and a first output piezoelectric element connected to the second electrode; And
A second piezoelectric transducer including a second output piezoelectric element connected to the first electrode and a second input piezoelectric element connected to the second electrode;
A piezoelectric transformer
The method according to claim 1,
And a switching element which is switch-controlled to connect the first electrode and the first input piezoelectric element or to connect the first electrode and the second output piezoelectric element according to a selection signal,
And a piezoelectric transformer.
The method according to claim 1,
A switching element which is switch-controlled to connect the second electrode to the first output piezoelectric element or to connect the second electrode to the second input piezoelectric element according to a selection signal,
And a piezoelectric transformer.
The method according to claim 1,
And a capacitor connected between the first electrode and the first piezoelectric transforming portion and the second piezoelectric transforming portion and connected between the second electrode and at least one of the first piezoelectric transforming portion and the second piezoelectric transforming portion, Transformers.
The method according to claim 1,
Wherein the first output piezoelectric element provides a transformed voltage using physical energy of the first input piezoelectric element by an input voltage applied to the first input piezoelectric element, And providing a transformed voltage using physical energy of the second input piezoelectric element by an input voltage applied to the piezoelectric transformer.
The method according to claim 1,
Wherein the first piezoelectric transforming portion and the second piezoelectric transforming portion have different resonant frequencies.
The method according to claim 1,
Wherein the first piezoelectric transforming portion and the second piezoelectric transforming portion have different input / output transforming ratios.
The piezoelectric transformer according to claim 1, wherein the first and second piezoelectric transformers
And an insulating layer formed between the first input piezoelectric element and the first output piezoelectric element and between the second input piezoelectric element and the second output piezoelectric element.
9. The method of claim 8, wherein the insulating layer
And at least one hollow inside the piezoelectric transformer.
9. The method of claim 8, wherein the insulating layer
A piezoelectric transformer formed of a thin film having insulation and ductility.
And a first piezoelectric transforming part and a second piezoelectric transforming part connected in parallel between the first electrode and the second electrode,
Wherein the first piezoelectric transformer includes a first input piezoelectric element to which an input voltage is applied and a first output piezoelectric element that provides a transformed voltage, the second piezoelectric transformer includes a second input piezoelectric element to which an input voltage is applied, And a second output piezoelectric element for providing the second output piezoelectric element.
12. The method of claim 11,
And a switch element which is switched and controlled to connect the first electrode and the first input piezoelectric element or to connect the first electrode and the second output piezoelectric element according to a selection signal.
12. The method of claim 11,
And a switching element which is switched and controlled to connect the second electrode and the first output piezoelectric element or to connect the second electrode and the second input piezoelectric element according to a selection signal.
12. The method of claim 11,
And a capacitor connected between the first electrode and the first piezoelectric transforming portion and the second piezoelectric transforming portion and connected between the second electrode and at least one of the first piezoelectric transforming portion and the second piezoelectric transforming portion, Transformers.
12. The method of claim 11,
Wherein the first output piezoelectric element provides a transformed voltage using physical energy of the first input piezoelectric element by an input voltage applied to the first input piezoelectric element, And providing a transformed voltage using physical energy of the second input piezoelectric element by an input voltage applied to the piezoelectric transformer.
12. The method of claim 11,
Wherein the first piezoelectric transforming portion and the second piezoelectric transforming portion have different resonant frequencies.
12. The method of claim 11,
Wherein the first piezoelectric transforming portion and the second piezoelectric transforming portion have different input / output transforming ratios.
KR1020150055859A 2015-04-21 2015-04-21 Piezoelectric transfomer KR20160125110A (en)

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Application Number Priority Date Filing Date Title
KR1020150055859A KR20160125110A (en) 2015-04-21 2015-04-21 Piezoelectric transfomer

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Application Number Priority Date Filing Date Title
KR1020150055859A KR20160125110A (en) 2015-04-21 2015-04-21 Piezoelectric transfomer

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KR20160125110A true KR20160125110A (en) 2016-10-31

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