CN202966122U - Back-up buzzer circuit - Google Patents
Back-up buzzer circuit Download PDFInfo
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- CN202966122U CN202966122U CN 201220656996 CN201220656996U CN202966122U CN 202966122 U CN202966122 U CN 202966122U CN 201220656996 CN201220656996 CN 201220656996 CN 201220656996 U CN201220656996 U CN 201220656996U CN 202966122 U CN202966122 U CN 202966122U
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Abstract
The utility model relates to a back-up buzzer circuit, which is applied to an automobile. The back-up buzzer circuit comprises a constant current circuit, a control circuit and a sound making circuit, wherein the constant current circuit is electrically connected with a power supply and can output constant current, the control circuit is electrically connected with the constant current circuit and the sound making circuit, the control circuit comprises a first capacitor, the switching on and the switching off of the sound making circuit are controlled through the charging or discharging of the first capacitor, the sound making circuit comprises a buzzer, and sound can be made by the buzzer when the sound making circuit is switched on. According to the back-up buzzer circuit disclosed by the utility model, an auto-excitation type circuit mode is adopted, thus the working current is greatly reduced, circuit elements are simple, and the power consumption is small.
Description
Technical field
The utility model relates to a kind of vehicular spare parts, relates in particular to a kind of back buzzer circuit.
Background technology
Back buzzer is a kind of important vehicular spare parts, and it can provide when reversing automobile reliably, stablizes, the continuous rhythmical alert prompting that rings, to reach safety and effectiveness.Present automobile buzzer phone roughly is divided into two types, and a kind of is electromagnetic type, and a kind of is voltage-type.The electromagnetic buzzer sound clarity, high temperature resistant, but current sinking is large.Piezo buzzer is mainly separated exciting, and it utilizes foreign frequency to remove to drive piezoelectricity singing piece, and middle booster circuit is generally all used step-up transformer.So just exist the own loss problem of voltage transformer, when the scope range of the fluctuation of voltage of automobile storage battery was larger, the loss of voltage transformer also changed thereupon, when the loss of voltage transformer becomes large, easily increase the power consumption of storage battery, and buzzer phone because generating heat, step-up transformer shortens self life-span.
The utility model content
In view of above-mentioned condition, be necessary the back buzzer circuit that provides a kind of power consumption little.
A kind of back buzzer circuit, it is applied to automobile, this back buzzer circuit comprises a constant-current circuit, a control circuit and a pronunciation circuit, this constant-current circuit and a power supply are electrically connected, and export constant electric current, this control circuit and constant-current circuit and pronunciation circuit are electrically connected, this control circuit comprises one first electric capacity, by this first capacitor charging or control of discharge this pronunciation circuit conducting or cut-off, this pronunciation circuit comprises buzzer phone, when this pronunciation circuit conducting, this buzzer phone is sounded.
a kind of back buzzer circuit, it is applied to automobile, this back buzzer circuit comprises a constant-current circuit, one control circuit and a pronunciation circuit, this constant-current circuit and a power supply are electrically connected, this constant-current circuit comprises one first aerotron, this first aerotron is used for outgoing current, this control circuit and constant-current circuit and pronunciation circuit are electrically connected, this control circuit comprises one second aerotron that while and the first aerotron are electrically connected, one the 3rd aerotron and one first electric capacity, this pronunciation circuit comprises a Hartley oscillation circuit that is electrically connected with the first aerotron, one buzzer phone and a control diode that is electrically connected with the 3rd aerotron, when this first capacitor charging, the 3rd aerotron conducting, control diode current flow, the Hartley oscillation circuit starting of oscillation, buzzer phone is sounded, when this first capacitive strike, the second aerotron conducting, the diode cut-off is controlled in the 3rd aerotron cut-off, not starting of oscillation of Hartley oscillation circuit, buzzer phone is not sounded.
Above-mentioned back buzzer circuit of the present utility model is controlled pronunciation circuit conducting and cut-off by control circuit, and then controls pronunciation circuit and sound.Simultaneously, adopt the circuit form of auto-excitation type due to this back buzzer circuit, greatly reduce working current, and circuit component is simple, power consumption is less.
Description of drawings
Fig. 1 is the circuit diagram of the back buzzer circuit of the utility model preferred embodiment.
The specific embodiment
Below in conjunction with drawings and Examples, back buzzer circuit of the present utility model is described in further detail.
See also Fig. 1, the back buzzer circuit 100 shown in preferred embodiment of the present utility model, it is used in various automobiles, with caution front vehicle and pedestrian in reversing process, to avoid accident.
In the present embodiment, this back buzzer circuit 100 adopts the circuit form of auto-excitation type, and it comprises a constant-current circuit 10, a control circuit 30 and a pronunciation circuit 50.
This constant-current circuit 10 is used to control circuit 30 that stable electric current is provided, and it comprises one first diode D1, one first resistance R 1, a zener diode ZD and one first aerotron Q1.The positive pole of this first diode D1 and a power supply (as 12V) are electrically connected, and the power supply of this 12V can be provided by the storage battery (not shown) of automobile.The negative pole of this first diode D1 is by the first resistance R 1 and zener diode ZD ground connection.This first aerotron Q1 is the aerotron of NPN type, and it comprises collecting electrode C1, base stage B1 and emitter-base bandgap grading E1.The negative pole of this collecting electrode C1 and the first diode D1 is electrically connected, this base stage B 1 is electrically connected between the first resistance R 1 and zener diode ZD, this emitter-base bandgap grading E1 and control circuit 30 and pronunciation circuit 50 are electrically connected, and are used for the electric current to control circuit 30 and pronunciation circuit 50 stable outputs.
This control circuit 30 is used for driving pronunciation circuit 50, and it comprises one second resistance R 2, one the 3rd resistance R 3, one the 4th resistance R 4, one the 5th resistance R 5, one second aerotron Q2, one the 3rd aerotron Q3 and the first capacitor C 11.This second aerotron Q2 is the aerotron of NPN type, and it comprises collecting electrode C2, base stage B2 and emitter-base bandgap grading E2.The 3rd aerotron Q3 is the aerotron of NPN type, and it comprises collecting electrode C3, base stage B3 and emitter-base bandgap grading E3.The positive pole of this first capacitor C 11 is electrically connected by the emitter-base bandgap grading E1 of the 4th resistance R 4 and the 3rd resistance R 3 and the first aerotron Q1 successively, and the negative pole of this first capacitor C 11 is electrically connected by the emitter-base bandgap grading E1 of the 5th resistance R 5 and the second resistance R 2 and the first aerotron Q1 successively.The base stage B2 of this second aerotron Q2 is electrically connected by the emitter-base bandgap grading E1 of the 5th resistance R 5 and the second resistance R 2 and the first aerotron Q1 successively, emitter-base bandgap grading E2 ground connection, and the base stage B3 of collecting electrode C2 and the 3rd aerotron Q3 is electrically connected.The base stage B3 of the 3rd aerotron Q3 is electrically connected by the emitter-base bandgap grading E1 of the second resistance R 2 and the first aerotron Q1, emitter-base bandgap grading E3 ground connection, and collecting electrode C3 is electrically connected between the 4th resistance R 4 and the 3rd resistance R 3.
This pronunciation circuit 50 consists of a Hartley oscillation circuit, and it is used for sounding, with caution front vehicle and pedestrian.This pronunciation circuit 50 comprises that an inductance L, a buzzer phone PZ, one second capacitor C 22, one the 6th resistance R 6, one the 4th aerotron Q4, one second diode D2 and one control diode D3.In the present embodiment, this inductance L is the magnetic screening inductance, and in the middle of it, emitter-base bandgap grading E1 of tap and the first aerotron Q1 is electrically connected.This inductance L, buzzer phone PZ and the second capacitor C 22 are arranged in parallel.The 4th aerotron Q4 is the aerotron of NPN type, and it comprises collecting electrode C4, base stage B4 and emitter-base bandgap grading E4.This base stage B4 is electrically connected by the 6th resistance R 6 and inductance L, buzzer phone PZ and the second capacitor C 22 end separately, this collecting electrode C4 and inductance L, buzzer phone PZ and the second capacitor C 22 other end separately is electrically connected, this emitter-base bandgap grading E4 is electrically connected at the positive pole of controlling diode D3, and the negative pole of this control diode D3 is electrically connected between the 3rd resistance R 3 and the 4th resistance R 4.This second diode D2 is electrically connected between the base stage B4 and emitter-base bandgap grading E4 of the 4th aerotron Q4, and wherein, the positive pole of the second diode D2 and emitter-base bandgap grading E4 are electrically connected, and the negative pole of the second diode D2 and base stage B4 are electrically connected.In the present embodiment, the drive current of this buzzer phone PZ is less than 25mA.
The below further illustrates the principle of work of this back buzzer circuit 100:
After constant-current circuit 10 obtains the power supply of 12V, the first aerotron Q1 conducting, and by the electric current of emitter-base bandgap grading E1 to control circuit 30 and pronunciation circuit 50 stable outputs.Aerotron Q2 cut-off this moment second, the 3rd aerotron Q3 conducting, the first capacitor C 11 begins charging.Due to the 3rd aerotron Q3 conducting, make the voltage of the negative pole of controlling diode D3 be dragged down, control diode D3 conducting.On the other hand, inductance L is obtained electric current and by the 4th aerotron Q4 discharge, is made the 4th aerotron Q4 conducting from the emitter-base bandgap grading E1 of the first aerotron Q1.Owing to controlling also conducting of diode D3, so, pronunciation circuit 50 forms current return, and the Hartley oscillation circuit of its formation begins starting of oscillation.Hinder the characteristic of curent change according to inductance L, the two ends of buzzer phone PZ produce alternating voltage immediately, thereby make buzzer phone sound, as " BI-BI " sound.Because inductance L of the present utility model is the magnetic screening inductance, make the sound that buzzer phone sends can not be interfered, do not have the existence of noise.
After the first capacitor C 11 was completed charging, this first capacitor C 11 began discharge.Because the first capacitor C 11 discharges make the base stage B2 of the second aerotron Q2 obtain high level, the second aerotron Q2 conducting thereafter, the voltage of the base stage B3 of the 3rd aerotron Q3 is dragged down makes the 3rd aerotron Q3 cut-off.So, the voltage of the negative pole of this control diode D3 is high level, controls not conducting of diode D3.At this moment, pronunciation circuit 50 can not form current return, and Hartley oscillation circuit stops starting of oscillation, and buzzer phone stops sounding.So, this first capacitor C 11 is completed the charge and discharge process of one-period, and begins the charge and discharge process in next cycle, does not repeat them here.
the above, it is only preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, although the utility model discloses as above with preferred embodiment, yet be not to limit the utility model, any those skilled in the art, within not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solutions of the utility model content, any simple modification that foundation technical spirit of the present utility model is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. back buzzer circuit, it is applied to automobile, it is characterized in that: this back buzzer circuit comprises a constant-current circuit, a control circuit and a pronunciation circuit, this constant-current circuit and a power supply are electrically connected, and export constant electric current, this control circuit and constant-current circuit and pronunciation circuit are electrically connected, this control circuit comprises one first electric capacity, by this first capacitor charging or control of discharge this pronunciation circuit conducting or cut-off, this pronunciation circuit comprises buzzer phone, when this pronunciation circuit conducting, this buzzer phone is sounded.
2. back buzzer circuit as claimed in claim 1, it is characterized in that: this constant-current circuit comprises one first diode, one first resistance, one zener diode and one first aerotron, the positive pole of this first diode and described power supply are electrically connected, the negative pole of this first diode is by the first resistance and zener diode ground connection, this first aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the negative pole of this collecting electrode and the first diode is electrically connected, this base stage is electrically connected between the first resistance and zener diode, this emitter-base bandgap grading and control circuit and pronunciation circuit are electrically connected, be used for to control circuit and pronunciation circuit outgoing current.
3. back buzzer circuit as claimed in claim 2, it is characterized in that: this control circuit also comprises one second resistance, one the 3rd resistance, one the 4th resistance, one the 5th resistance, one second aerotron and one the 3rd aerotron, this second aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the 3rd aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the positive pole of this first electric capacity is electrically connected by the emitter-base bandgap grading of the 4th resistance and the 3rd resistance and the first aerotron successively, the negative pole of this first electric capacity is electrically connected by the emitter-base bandgap grading of the 5th resistance and the second resistance and the first aerotron successively, the base stage of this second aerotron is electrically connected by the emitter-base bandgap grading of the 5th resistance and the second resistance and the first aerotron successively, the emitter grounding of this second aerotron, the base stage of the collecting electrode of this second aerotron and the 3rd aerotron is electrically connected, the base stage of the 3rd aerotron is electrically connected by the emitter-base bandgap grading of the second resistance and the first aerotron, the emitter grounding of the 3rd aerotron, the collecting electrode of the 3rd aerotron is electrically connected between the 4th resistance and the 3rd resistance.
4. back buzzer circuit as claimed in claim 3, it is characterized in that: this pronunciation circuit also comprises an inductance, one second electric capacity, one the 6th resistance, one the 4th aerotron, one second diode and one is controlled diode, the emitter-base bandgap grading of this inductance and the first aerotron is electrically connected, this inductance, buzzer phone and the second Capacitance parallel connection setting, the 4th aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the base stage of the 4th aerotron is by the 6th resistance and inductance, buzzer phone and the second an electric capacity end separately is electrically connected, the collecting electrode of the 4th aerotron and inductance, buzzer phone and the second electric capacity other end separately is electrically connected, the emitter-base bandgap grading of the 4th aerotron is electrically connected at the positive pole of controlling diode, the negative pole of this control diode is electrically connected between the 3rd resistance and the 4th resistance, this second diode electrically is connected between the base stage and emitter-base bandgap grading of the 4th aerotron.
5. back buzzer circuit as claimed in claim 4, is characterized in that: this pronunciation circuit formation one Hartley oscillation circuit.
6. back buzzer circuit as claimed in claim 4 is characterized in that: when the first capacitor charging, diode current flow is controlled in the 3rd aerotron conducting, the 4th aerotron conducting, and the pronunciation circuit starting of oscillation, buzzer phone is sounded.
7. back buzzer circuit as claimed in claim 4 is characterized in that: when the first capacitive strike, and the second aerotron conducting, the diode cut-off is controlled in the 3rd aerotron cut-off, not starting of oscillation of pronunciation circuit, buzzer phone is not sounded.
8. back buzzer circuit, it is applied to automobile, it is characterized in that: this back buzzer circuit comprises a constant-current circuit, one control circuit and a pronunciation circuit, this constant-current circuit and a power supply are electrically connected, this constant-current circuit comprises one first aerotron, this first aerotron is used for outgoing current, this control circuit and constant-current circuit and pronunciation circuit are electrically connected, this control circuit comprises one second aerotron that while and the first aerotron are electrically connected, one the 3rd aerotron and one first electric capacity, this pronunciation circuit comprises a Hartley oscillation circuit that is electrically connected with the first aerotron, one buzzer phone and a control diode that is electrically connected with the 3rd aerotron, when this first capacitor charging, the 3rd aerotron conducting, control diode current flow, the Hartley oscillation circuit starting of oscillation, buzzer phone is sounded, when this first capacitive strike, the second aerotron conducting, the diode cut-off is controlled in the 3rd aerotron cut-off, not starting of oscillation of Hartley oscillation circuit, buzzer phone is not sounded.
9. back buzzer circuit as claimed in claim 8, it is characterized in that: described the first aerotron comprises emitter-base bandgap grading, this second aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the 3rd aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the collecting electrode of the emitter-base bandgap grading of the positive pole of this first electric capacity and the first aerotron and the 3rd aerotron is electrically connected, the base stage of the emitter-base bandgap grading of the negative pole of this first electric capacity and the first aerotron and the second aerotron is electrically connected, the emitter grounding of this second aerotron, the base stage of the collecting electrode of this second aerotron and the 3rd aerotron is electrically connected, the emitter grounding of the 3rd aerotron, the collecting electrode of the 3rd aerotron is electrically connected at the control diode.
10. back buzzer circuit as claimed in claim 9, it is characterized in that: described Hartley oscillation circuit comprises an inductance and one the 4th aerotron, this inductance and the first aerotron are electrically connected, this inductance and buzzer phone are arranged in parallel, the 4th aerotron comprises collecting electrode, base stage and emitter-base bandgap grading, the base stage of the 4th an aerotron and inductance and buzzer phone end separately is electrically connected, the collecting electrode of the 4th aerotron and inductance and the buzzer phone other end separately is electrically connected, the emitter-base bandgap grading of the 4th aerotron is electrically connected at the positive pole of controlling diode, the negative pole of this control diode is electrically connected at the collecting electrode of the 3rd aerotron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220656996 CN202966122U (en) | 2012-11-30 | 2012-11-30 | Back-up buzzer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220656996 CN202966122U (en) | 2012-11-30 | 2012-11-30 | Back-up buzzer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202966122U true CN202966122U (en) | 2013-06-05 |
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ID=48507238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220656996 Expired - Lifetime CN202966122U (en) | 2012-11-30 | 2012-11-30 | Back-up buzzer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202966122U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096930A (en) * | 2014-04-30 | 2015-11-25 | 鸿富锦精密工业(武汉)有限公司 | Buzzer circuit |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
-
2012
- 2012-11-30 CN CN 201220656996 patent/CN202966122U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096930A (en) * | 2014-04-30 | 2015-11-25 | 鸿富锦精密工业(武汉)有限公司 | Buzzer circuit |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
| CN109003597B (en) * | 2018-09-25 | 2023-11-03 | 华润微集成电路(无锡)有限公司 | Buzzer driving circuit and corresponding buzzer driving method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |