CN214588010U

CN214588010U - Buzzer structure with built-in low-frequency booster circuit

Info

Publication number: CN214588010U
Application number: CN202120178471.7U
Authority: CN
Inventors: 程氶; 张华锜
Original assignee: Kingstate Electronics Corp
Current assignee: Kingstate Electronics Corp
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-11-02
Anticipated expiration: 2031-01-22

Abstract

The utility model relates to a built-in low frequency booster circuit's buzzer structure, it includes: a main housing; the piezoelectric sound piece is arranged on the first supporting flange of the main shell; and a drive circuit board disposed on the second support flange of the main casing, and provided with a low-frequency booster circuit having: the input end of the first charge pump is connected with a linear voltage stabilizer in series, and the linear voltage stabilizer is used for receiving a first voltage; a second charge pump, the input end of which is used for receiving a second voltage; and a 2-time boosting unit, the input end of which is used for receiving a third voltage; the first charge pump, the second charge pump and the 2-time boosting unit have a common output end.

Description

Buzzer structure with built-in low-frequency booster circuit

Technical Field

The utility model relates to a built-in low frequency boost circuit's buzzer structure, especially a buzzer structure of built-in low frequency boost circuit who is applied to traffic carrier, industrial safety, commercial warning, or safe warning at home and use.

Background

The buzzer is an electronic buzzer, adopts voltage to supply power, and is widely applied to electronic products such as computers, printers, copiers, alarms, electronic toys, automobile electronic equipment, telephones, timers … and the like as sounding devices. The buzzer and the loudspeaker are different products, and the buzzer can send out vibration warning sound after being electrified for anti-theft or other warning purposes.

Since the application field of the buzzer is very wide, different frequency response characteristics are needed to match with different application fields, for example, when the buzzer is applied underwater or diving, the buzzer needs to have better performance at low frequency.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a built-in low frequency booster circuit's buzzer structure, it mainly is when solving buzzer low frequency, the not good problem of frequency response.

The utility model provides a built-in low frequency booster circuit's buzzer structure, it includes: a main housing having: a bottom plate having a sound outlet hole at the center thereof; the main shell wall body is formed by extending upwards from the periphery of the bottom plate, and the inner side of the main shell wall body is provided with a first supporting flange and a second supporting flange; the piezoelectric sound piece is arranged on the first supporting flange and corresponds to the position of the sound outlet hole; and the driving circuit board is arranged on the second supporting flange and is electrically connected with the piezoelectric sound piece, and the driving circuit board is provided with a low-frequency boosting circuit which is provided with: a first charge pump (charge pump) having an input terminal connected in series with a low dropout regulator (LDO) for receiving a first voltage; a second charge pump, the input end of which is used for receiving a second voltage; and a 2-time boosting unit, the input end of which is used for receiving a third voltage; the first charge pump, the second charge pump and the 2-time boosting unit have a common output end.

Preferably, the end of the main casing wall is further combined with a cover plate.

Preferably, the piezoelectric patch is a ceramic piezoelectric patch.

Preferably, the first voltage is 1 to 3.3 volts.

Preferably, the second voltage is 2.2 to 3.3 volts.

Preferably, the third voltage is 3 to 18 volts.

By means of the utility model, the following progress effects can be achieved at least:

first, the buzzer can have better frequency response at low frequency.

And secondly, a hierarchical low-frequency response can be generated by a plurality of groups of booster circuits.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is an exploded view of a buzzer structure with a built-in low-frequency boosting circuit.

Fig. 2 is a front combination example of a buzzer structure with a built-in low-frequency boosting circuit.

FIG. 3 is a diagram of a buzzer structure with a built-in low frequency boosting circuit according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of the embodiment of fig. 3.

FIG. 5 is a block diagram of an embodiment of a low frequency boost circuit.

[ description of main element symbols ]

100: buzzer structure with built-in low-frequency booster circuit 100 a: buzzer shell structure

10: main housing 110: base plate

111: sound outlet hole 120: main casing wall body

121: first support flange 122: second support flange

130: sound cavity structure 140: cover plate

20: piezoelectric sound piece 30: driving circuit board

30 a: low-frequency boost circuit 310: first charge pump

311: the linear regulator 320: second charge pump

330: 2-time boosting unit V1: first voltage

V2: second voltage V3: third voltage

O/P: output end

Detailed Description

As shown in fig. 1 to 4, the present embodiment is a buzzer structure 100 with a built-in low-frequency boosting circuit, which includes: a main housing 10; a piezoelectric sound piece 20; and a driving circuit board 30.

A main housing 10 having: a base plate 110; and a main housing wall 120. A base plate 110 having a sound outlet hole 111 at a central portion thereof; and a main casing wall 120 formed by extending the periphery of the bottom plate 110 upward, and a first support flange 121 and a second support flange 122 are formed on the inner side of the main casing wall 120.

The bottom plate 110 and the main housing wall 120 form an acoustic cavity structure 130. The end of the wall of the main housing 10 may further be combined with a cover plate 140, so as to form a complete buzzer housing structure 100 a.

A piezoelectric patch 20, which may be a ceramic piezoelectric patch 20. The piezoelectric sound piece 20 is vibratably disposed on the first supporting flange 121 and cooperates with the sound cavity structure 130, and the piezoelectric sound piece 20 is disposed at a position corresponding to the sound outlet hole 111. When the piezoelectric sound piece 20 receives the audio signal, the piezoelectric sound piece 20 will expand and contract due to the mechanical deformation caused by the piezoelectric effect, so as to vibrate and sound, and then the buzzer structure 100 will sound under the action of the sound cavity structure 130.

A driving circuit board 30 disposed on the second supporting flange 122 and electrically connected to the piezoelectric sound chip 20; the driving circuit board 30 is mainly used to generate an audio signal and amplify the audio signal to a sufficient power, and then input the audio signal to the piezoelectric patch 20, so as to effectively push the piezoelectric patch 20 to vibrate.

As shown in fig. 5, in the present embodiment, the audio signal is mainly generated by the low-frequency boost circuit 30a on the driving circuit board 30, and the low-frequency boost circuit 30a includes: a first charge pump 310; a second charge pump 320; and a 2-fold boosting unit 330.

The first charge pump 310 has an input terminal connected in series with a linear regulator 311, the linear regulator 311 is configured to receive a first voltage V1, and the first voltage V1 may be 1 to 3.3 volts.

The second charge pump 320 has an input for receiving the second voltage V2, and the second voltage V2 may be 2.2 to 3.3 volts.

The 2-fold boosting unit 330 has an input terminal for receiving the third voltage V3, and the third voltage V2 may be 3 to 18 volts, and the first charge pump 310, the second charge pump 320, and the 2-fold boosting unit 330 have a common output terminal O/P.

By means of the low-frequency boosting circuit 30a, better performance can be achieved in a low-frequency sound range, so that better effects can be achieved in certain application fields. In addition, the first charge pump 310, the second charge pump 320 and the 2-time boosting unit 330 can make the buzzer generate a low-frequency response with hierarchy at a low-frequency part.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention, but all the modifications, changes and modifications of the above embodiments by the technical spirit of the present invention are within the scope of the present invention.

Claims

1. A built-in low frequency booster circuit's buzzer structure, its characterized in that includes:

a main housing having:

a bottom plate having a sound outlet hole at the center thereof; and

a main casing wall body formed by extending upwards from the periphery of the bottom plate, and a first supporting flange and a second supporting flange are formed on the inner side of the main casing wall body;

the piezoelectric sound sheet is arranged on the first supporting flange and corresponds to the position of the sound outlet hole; and

the drive circuit board, it sets up on this second support flange, and this piezoelectricity sound piece of electric connection, is equipped with low frequency booster circuit again on this drive circuit board, and it has:

a first charge pump, the input end of which is connected with a linear voltage stabilizer in series, and the linear voltage stabilizer is used for receiving a first voltage;

a second charge pump, the input end of which is used for receiving a second voltage; and

a 2-time boosting unit, an input end of which is used for receiving a third voltage;

wherein the first charge pump, the second charge pump, and the 2-fold boosting unit have a common output terminal.

2. The buzzer structure of claim 1, wherein the end of the main housing wall is further coupled with a cover plate.

3. A buzzer structure in accordance with claim 1, characterised in that the piezoelectric patch is a ceramic piezoelectric patch.

4. The buzzer structure of claim 1, wherein the first voltage is 1 to 3.3 volts.

5. The buzzer structure of claim 1, wherein the second voltage is 2.2 to 3.3 volts.

6. The buzzer structure of claim 1, wherein the third voltage is 3 to 18 volts.