CN201477871U - back-up buzzer - Google Patents
back-up buzzer Download PDFInfo
- Publication number
- CN201477871U CN201477871U CN2009201869396U CN200920186939U CN201477871U CN 201477871 U CN201477871 U CN 201477871U CN 2009201869396 U CN2009201869396 U CN 2009201869396U CN 200920186939 U CN200920186939 U CN 200920186939U CN 201477871 U CN201477871 U CN 201477871U
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- Prior art keywords
- triode
- buzzer
- oscillating circuit
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- circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
A back-up buzzer is characterized in that the back-up buzzer is provided with an audio oscillating circuit consisting of a triple piezoelectric ceramic buzzing sheet and a triode, the audio oscillating circuit utilizes output signals of an oscillating circuit consisting of a triode and a peripheral device as driving control signals and utilizes the triode as a driving tube, and the triple piezoelectric ceramic buzzing sheet is arranged inside a resonant cavity. The back-up buzzer meets requirements of sound level of back-up buzzers of electric engineering vehicles, reduces work current simultaneously, and is stable in property.
Description
Technical field
The utility model relates to the battery powered engineering truck reversing of a kind of dependence alarming device.
Background technology
The back buzzer of engineering truck outfit at present is big, and a kind of is electromagnetic type to being divided into two types, and a kind of is voltage-type.Electromagnetic type hummer sound clarity is thorough, and is high temperature resistant, but because of current sinking is big, for relying on battery powered engineering truck to be not suitable for selecting for use.Piezo buzzer mainly is a separated exciting, the separated exciting hummer is to remove to drive piezoelectricity singing piece with foreign frequency, and middle boosting section parallel circuit is generally all used step-up transformer, so just exist the own loss problem of transformer, and when the battery voltage fluctuation range was big, the loss of transformer changed thereupon also, when the loss of transformer becomes big, the storage battery electric weight that not only increases consumption, and hummer is because the step-up transformer heating, and self can shorten in the life-span.Existing auto-excitation type piezoelectric buzzer is done not highly because of sound level, can't satisfy the requirement for sound level of engineering truck.
The utility model content
The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of back buzzer is provided, adopt the circuit form of auto-excitation type, can guarantee that it reaches request for utilization in sound level, having the advantage of considerable energy saving consumption reduction again.
The utility model technical solution problem adopts following technical scheme:
The design feature of the utility model back buzzer is:
The design feature of the utility model back buzzer is that the audio oscillator circuit of being made up of three grades of piezoelectric ceramics piezo and triode is set; Described audio oscillator circuit is that the output signal with the oscillatory circuit that is made of triode and peripheral components is a drive control signal, is driving tube with the triode; Described three grades of piezoelectric ceramics piezo are arranged in the resonant cavity.
Compared with the prior art, the utility model beneficial effect is embodied in:
The utility model can reduce the working current of hummer greatly when the sound level that satisfies electronic engineering truck back buzzer requires, and stable performance.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Below pass through embodiment, and the utility model is described in further detail in conjunction with the accompanying drawings.
Embodiment
Referring to Fig. 1, the present embodiment setting is used to produce sound signal by the Hartley oscillation circuit that three grades of piezoelectric ceramics piezo P1 and triode T4 form; This audio oscillator circuit is that the output signal with the oscillatory circuit that is made of triode T1, T2 is a drive control signal, is driving tube with triode T3.
Shown in Figure 1, diode D3 is the power supply reverse connection protection diode, when the VCC energized, and the E utmost point ground connection of triode T4, the Hartley oscillation circuit starting of oscillation, oscillation frequency is by the fundamental frequency decision of piezoelectric ceramics piezo P1.
Cease acoustic control circuit between triode T1, T2, capacitor C 1, C2, C3, diode D2 and three grades of piezoelectric ceramics piezo P1 of resistance R 6 formations, its course of work is that when the VCC energized, triode T2 is conducting gradually in the charging process of capacitor C 3.After the T2 conducting, also slowly conducting in the charging process of capacitor C 1 of T1, after the T1 conducting, the B utmost point of T3 has just had forward voltage, and at this moment, T3 also is switched on, and after the T3 conducting, Hartley oscillation circuit begins starting of oscillation, three grades of piezoelectric ceramics piezo P1 sounding.In the T3 conducting, D2 also is switched on, and at this moment, the common pressure drop of T3 and D2 has only about 1V, and divide into groups the at this moment base voltage of T2 of the bleeder circuit that resistance R 3 and R8 form has only about 0.25V, so T2 is cut off.After T2 was cut off, C1 began discharge.When the C1 electric weight when having put, T1 ends, T3 ends thereupon, the Hartley oscillation circuit failure of oscillations, three grades of piezoelectric ceramics piezo P1 stop buzzing.And after T3 ends, D2 also ends, at this moment, the base stage of T2 has been recovered forward voltage again, then new one take turns conducting and begin again by circulation, like this, breath sound forms between hummer, regulating the size of resistance R 6, can change the discharge time of capacitor C 1, is the breath time between the buzzing of scalable hummer like this.
For abundant amplification of volume, three grades of piezoelectric ceramics piezo 1 can be arranged in the resonant cavity.
Claims (1)
1. back buzzer is characterized in that being provided with the audio oscillator circuit of being made up of three grades of piezoelectric ceramics piezo (P1) and triode (T4); Described audio oscillator circuit is that the output signal with the oscillatory circuit that is made of triode (T2) and peripheral components is a drive control signal, is driving tube with triode (T3); Described three grades of piezoelectric ceramics piezo (P1) are arranged in the resonant cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201869396U CN201477871U (en) | 2009-08-13 | 2009-08-13 | back-up buzzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201869396U CN201477871U (en) | 2009-08-13 | 2009-08-13 | back-up buzzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201477871U true CN201477871U (en) | 2010-05-19 |
Family
ID=42414127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201869396U Expired - Fee Related CN201477871U (en) | 2009-08-13 | 2009-08-13 | back-up buzzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201477871U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531140A (en) * | 2016-12-05 | 2017-03-22 | 深圳市泛海三江电子股份有限公司 | Piezoelectric buzzer drive circuit |
-
2009
- 2009-08-13 CN CN2009201869396U patent/CN201477871U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531140A (en) * | 2016-12-05 | 2017-03-22 | 深圳市泛海三江电子股份有限公司 | Piezoelectric buzzer drive circuit |
| CN106531140B (en) * | 2016-12-05 | 2023-05-05 | 深圳市高新投三江电子股份有限公司 | Piezoelectric buzzer driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20140813 |
|
| EXPY | Termination of patent right or utility model |