CN104105029A - Circuit capable of adjusting pulse width of electronic horn driving signals and circuit - Google Patents
Circuit capable of adjusting pulse width of electronic horn driving signals and circuit Download PDFInfo
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- CN104105029A CN104105029A CN201310117819.1A CN201310117819A CN104105029A CN 104105029 A CN104105029 A CN 104105029A CN 201310117819 A CN201310117819 A CN 201310117819A CN 104105029 A CN104105029 A CN 104105029A
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Abstract
The invention provides an electronic horn driving circuit and a method of driving the electronic horn. The electronic horn driving circuit comprises a first Schmidt trigger, the first Schmidt trigger generates pulse signals with a duty ratio by using status switching, and the driving circuit drives the electronic horn to produce a sound by using the pulse signals. The circuit provided by the invention overcomes the defect that a previous electronic horn made by using a time-base circuit, an amplifying circuit and the like can not operate stably because of being easily interfered by feedback signals such as sounds, vibrations and the like generated by other machineries of an automobile itself.
Description
Technical field
The present invention relates to vehicle electronic loudspeaker, more particularly relate to the Method and circuits that Schmidt trigger is adjusted electronic horn drive signal impulse width.
Background technology
The advantages such as at present automobile electronic loudspeaker is because the life-span is long, and electromagnetic radiation is low start to be progressively widely used in automobile industry.But because loudspeaker manufacture process is subject to the conforming impact of raw material, environment for use and service time also can affect the resonance frequency of every loudspeaker, except the complete intelligent loudspeaker of computer of embedding single-chip microcomputer (but cost is higher), ordinary electronic loudspeaker are caused during for engine, air conditioner, gearbox and driving the feedback signals such as sound that vehicle body produces and vibration signal not processed when signal is processed by state of ground, stability, reliability and consistency while causing loudspeaker to be worked have larger impact.
Summary of the invention
The Method and circuits that the object of this invention is to provide the adjustment electronic horn driving signal stabilization that can overcome above problem.
According to first aspect, the invention provides a kind of electronic horn drive circuit, comprise the first Schmidt trigger, described the first Schmidt trigger utilizes state conversion to produce the pulse signal with duty ratio, and drive circuit utilizes this pulse signal to drive electronic horn sounding.It is characterized in that by adjusting the first Schmidt trigger input terminal voltage signal, change the pulse duration of pulse signal.
Described electronic horn drive circuit preferably includes voltage follower circuit, and this voltage follower circuit is connected between supply voltage and the input of the first Schmidt trigger, thereby adjusts the signal of the input of the first Schmidt trigger.This drive circuit further preferably includes the acoustic feedback signal treatment circuit with the second Schmidt trigger and sound transducer, by the output signal of the second Schmidt trigger, thus the signal of adjustment the first Schmidt trigger input.
Described electronic horn drive circuit preferably includes the temperature protection circuit with the 3rd Schmidt trigger and thermistor, by changing the output signal of the 3rd Schmidt trigger, thus the voltage signal of adjustment the first Schmidt trigger input.This circuit further preferably includes the excess voltage protection with the 4th Schmidt trigger, thereby by changing the signal of the 4th Schmidt trigger output, has influence on the signal of the first Schmidt trigger output.
According to second aspect, the invention provides a kind of method that drives electronic horn, described method comprises: the first Schmidt trigger utilizes state conversion to produce the pulse signal with duty ratio, utilizes this pulse signal to drive electronic horn sounding; The signal producing by sound transducer is worked the second Schmidt trigger, thereby adjusts the signal of the first Schmidt trigger input; The voltage signal producing by thermistor is worked the 3rd Schmidt trigger, thereby adjusts the signal of the first Schmidt trigger input; By adjusting the pulse duration of the first Schmidt trigger output end signal, loudspeaker operating current is stablized and made loudspeaker remain on the preferably step of resonance working point.
Accompanying drawing explanation
Fig. 1 is according to the principle schematic of electronic horn drive circuit of the present invention;
Fig. 2 is according to the schematic diagram of the drive circuit of embodiment of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Fig. 1 is according to the principle schematic of electronic horn drive circuit of the present invention.As shown in Figure 1, this circuit comprise that power suppling part divides 11, acoustic feedback signal processing unit 12, temperature protection unit 13, drive signal generation unit 14, power drive unit 15 and overvoltage protective unit 16.
Power suppling part divides 11 by a voltage stabilizing circuit, to produce stabilized voltage power supply, and offers unit.
Acoustic feedback signal processing unit 12 produces the feedback signal of current sound.By sound transducer, produce level, it acts on the input of the second Schmidt trigger, and the output of the second Schmidt trigger produces pulse train.
Temperature protection unit 13 produces Current Temperatures feedback signal.Because the resistance of thermistor can change along with the variation of temperature, the voltage signal producing according to the change in resistance of thermistor is applied to the input of the 3rd Schmidt trigger, changes the output pulse width of the first Schmidt trigger.
Drive signal generation unit 14 receives the feedback signal of acoustic feedback signal processing unit 12 and 13 outputs of temperature protection unit; this signal is applied to the input of the first Schmidt trigger its circuit toggle frequency is followed to processing; and the pulse duration of control output end signal, loudspeaker can be worked all the time on better resonance point.
Signal after power drive unit 15 pulse-width adjustment carries out power amplification, to drive loudspeaker electromagnet coil.Power drive unit 15 can adopt the devices such as transistor to realize.
Overvoltage protecting unit 16 is by under current loudspeaker operating voltage, and divider resistance produces the input that different level acts on the 4th Schmidt trigger, thereby controls the first Schmidt trigger output end signal.The 4th Schmidt trigger output output low level signal while being greater than a certain value as current loudspeaker operating voltage, the output signal that drive signal generation unit 14 produces by the 4th Schmidt trigger earth potential of releasing, causes driver element 15 to quit work by switching diode.
Fig. 2 is according to the schematic diagram of the drive circuit of the embodiment of the present invention.In this drive circuit, with Schmidt trigger, frequency and the pulsewidth of driving signal are adjusted.
Described drive circuit comprises that loudspeaker drive signal generator to divide.This drive circuit can also comprise that power suppling part divides, power amplifying part, acoustic feedback signal processing section, temperature protection part and overvoltage protection part
Power suppling part divides and comprises a serial regulating circuit, and this serial regulating circuit can comprise switching diode D7, current-limiting resistance R11 and voltage stabilizing didoe DW1.The positive pole of switching diode D7 is connected with power positive end, and negative terminal is connected with resistance R 11.Capacitor C 3 is in parallel with voltage stabilizing didoe DW1, is then connected between the negative pole and resistance R 11 of power supply, and burning voltage is provided thus.
Loudspeaker drive signal generator to divide can comprise two switching diode D3, D4, resistance R 6, R7, the first Schmidt trigger Q1 and capacitor C 2.Switching diode D3, resistance R 6 form series circuit, and switching diode D4, resistance R 7 form series circuit, and these two series circuits are connected in parallel between the input and output of the first Schmidt trigger Q1.The negative terminal of the positive pole of switching diode D3, switching diode D4 and the output of Schmidt trigger intersect.The output of Schmidt trigger is connected with field effect transistor T1 through resistance R 10.The input of the first Schmidt trigger Q1 is connected with power supply negative terminal by capacitor C 2.
Loudspeaker drive signal generator to divide can also comprise that one by switching diode D2 and resistance R 5 voltage follower circuit in series.The positive pole of switching diode D2 is connected with the negative pole of diode D7, following signal and changing the level of the first Schmidt trigger Q1 input of supply voltage is provided thus, thereby changes the pulse duration that loudspeaker drive signal.
In the course of work, power supply is changed to the input that is superimposed upon the first Schmidt trigger Q1, and capacitor C 2 is charged, now the first Schmidt trigger Q1 input is low level and raises gradually, and the series circuit that output signal consists of switching diode D3 and resistance R 6 charges to capacitor C 2; When the first Schmidt trigger Q1 input level reaches forward threshold voltage, circuit reversion, now the output of the first Schmidt trigger Q1 is low level, capacitor C 2 is discharged, because its series circuit consisting of resistance R 7 and switching diode D4 is connected to the output of the first Schmidt trigger Q1, so discharge to ground end by connecting the first Schmidt trigger Q1 of power supply negative terminal.When reducing gradually and reaching negative sense threshold voltage along with the output level of the first Schmidt trigger Q1, circuit reverses again, and the first Schmidt trigger Q1 continues output high level signal.Capacitor C 2 continues charging, and repeats said process, produces pulse signal.
Power amplifying part comprises a field effect transistor T1.The grid of field effect transistor T1 is connected to loudspeaker by resistance R 10 and drives signal generator to divide output, receives the output pulse signal with certain pulse duration.The source electrode of field effect transistor T1 is connected to power supply negative terminal.Between the drain electrode of field effect transistor T1 and source electrode, be connected with the parallel circuits that a diode D6 and capacitor C 4 form.The positive pole of diode D6 is connected with the source electrode of field effect transistor T1.Field effect transistor T1, diode D6, capacitor C 4 form one and absorb protective circuit.Between the negative pole of the drain electrode of field effect transistor T1 and diode D1, connecting loudspeaker (SP).Under the driving of being on the scene effect pipe, sound horn.
By in the first Schmidt trigger Q1 input superposed signal, affect the reversing time of the first Schmidt trigger Q1, thereby change the duty ratio that loudspeaker drive signal.
In an example, with the increase of supply power voltage, the first Schmidt trigger Q1 has reduced the pulse duration of output drive signal automatically, has also just reduced the operating current of loudspeaker, and this has kept the stable of loudspeaker operating currents to a certain extent.Make loudspeaker preferably setting on working point and to pipe.
In another example, drive circuit comprises acoustic feedback signal processing section.This acoustic feedback signal processing section can comprise resistance R 4, sound transducer MIC, the second Schmidt trigger Q2 and capacitor C 1.The series circuit that resistance R 4 and sound transducer MIC form is connected between the positive pole and negative pole of power supply, the input of the second Schmidt trigger Q2 is connected with the tie point of resistance R 4, sound transducer MIC, and its output connects the input of the first Schmidt trigger Q1 by capacitor C 1.
When sound transducer receives certain loudness of a sound, produce voltage, and be input to the input of the second Schmidt trigger Q2.When the work loudness of a sound of sound transducer is for example not less than 90db, the second Schmidt trigger Q2 input reaches triggering level, its output signal is input to the input of the first Schmidt trigger Q1 through capacitor C 1 every straight processing, with this, can change the pulse duration that loudspeaker drive signal, thereby change the operating frequency of loudspeaker.So effectively reduce other and be less than the impact that 90db and vibration and noise signals cause, stopped to use in prior art the problem that in time-base circuit, amplifier is not only processed feedback signal amplification, improved to a great extent the stability of loudspeaker work.
In addition, the output electrical signals of sound transducer has certain frequency scope, and this frequency range comprises the better resonance frequency of loudspeaker.Capacitor C 1 outputs to the signal of telecommunication like this input of the first Schmidt trigger Q1, and changed thus the charge rate of capacitor C 2, thereby changed the frequency of the pulse signal (being also the driving signal of loudspeaker) of the first Schmidt trigger Q1 output, finally make loudspeaker be operated in preferably working point.
In another example, drive circuit comprises a temperature protection part.This temperature protection part can comprise thermistor R1, resistance R 2, R3, the 3rd Schmidt trigger Q3 and switching diode D1.The series circuit of thermistor R1 and resistance R 2 is connected between power positive cathode, and forms the bleeder circuit to the 3rd Schmidt trigger Q3 input.Resistance R 3, switching diode D1 form series circuit.The output of the 3rd Schmidt trigger Q3 is connected with resistance R 3.The positive pole of switching diode D1 is connected with resistance R 3, and negative terminal is connected with the input of the first Schmidt trigger Q1.
In Fig. 2, thermistor can be negative temperature coefficient.Certainly, those skilled in the art understand, the thermistor that adopts positive temperature coefficient be also feasible only should be by R1, R2 transposition.During normal temperature, the resistance of thermistor R1 makes the 3rd Schmidt trigger Q3 conducting, and the 3rd Schmidt trigger Q3 output is low level, and its output signal is blocked by switching diode D1.When temperature is spent lower than subzero ten, thermistor R1 resistance raises, make the voltage of the input of the 3rd Schmidt trigger Q3 reach triggering level and overturn, its output is high level, and output signal, through switching diode D1, is input to the input of the first Schmidt trigger Q1.Owing to both providing charging current from 5 pairs of capacitor C 2 of resistance R, from 3 pairs of capacitor C 2 of resistance R, provide charging current again, improved the charging rate of capacitor C 2, reduce the pulse duration that loudspeaker drive signal, thereby effectively solve the problem of loudspeaker low temperature abnormal sound.
In another example, drive circuit comprises an overvoltage protection part.This overvoltage protection part can comprise that one by resistance R 8, R9 bleeder circuit in series, and the 4th Schmidt trigger Q4 and switching diode D5.The bleeder circuit that resistance R 8, R9 form is connected between positive source, negative level, and provides input voltage for the input of the 4th Schmidt trigger Q4.The positive pole of switching diode D5 is connected with the tie point of resistance R 10 with the grid of field effect transistor T1, and negative pole is connected with the output of the 4th Schmidt trigger Q4.
When loudspeaker supply power voltage for example surpasses 20V, the partial pressure value of the voltage divider being comprised of resistance R 8, R9 reaches certain numerical value, the output that makes the 4th Schmidt trigger Q4 is low level, switching diode D5 gets through, R10 output signal is by switching diode D5 by the 4th Schmidt trigger ground voltage of releasing, and now field effect transistor T1 stops output.When loudspeaker supply power voltage reduces gradually, the voltage divider partial pressure value that resistance R 8, R9 form reduces gradually, and the output of the 4th Schmidt trigger Q4 is high level, and switching diode D5 closes, its output signal is ended by switching diode D5, and field effect transistor T1 recovers normal output.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. an electronic horn drive circuit, comprises the first Schmidt trigger, and described the first Schmidt trigger utilizes state conversion to produce the pulse signal with duty ratio, and drive circuit utilizes this pulse signal to drive electronic horn sounding.
2. electronic horn drive circuit according to claim 1, is characterized in that described drive circuit, by adjusting the first Schmidt trigger input terminal voltage signal, changes the pulse duration of pulse output signals.
3. electronic horn drive circuit according to claim 1, it is characterized in that comprising voltage follower circuit, this voltage follower circuit is connected between supply voltage and the input of the first Schmidt trigger, to change the pulse duration of described pulse signal when mains voltage variations.
4. electronic horn drive circuit according to claim 1, it is characterized in that described drive circuit comprises the acoustic feedback signal treatment circuit with the second Schmidt trigger and sound transducer, when the voltage signal that reaches certain limit and sound transducer output when the input sound intensity of sound transducer reaches the second Schmidt trigger threshold value, the second Schmidt trigger work, thereby the voltage signal of adjustment the first Schmidt trigger input.
5. electronic horn drive circuit according to claim 1; it is characterized in that described drive circuit comprises the temperature protection circuit with the 3rd Schmidt trigger and thermistor; when temperature protection circuit reaches the 3rd Schmidt trigger threshold value with the resistance of the variation change thermistor of ambient temperature and the voltage signal of the thermistor output after the change of this resistance; the 3rd Schmidt trigger work, thereby the voltage signal of adjustment the first Schmidt trigger input.
6. electronic horn drive circuit according to claim 1, is characterized in that described drive circuit comprises an excess voltage protection.
7. electronic horn drive circuit according to claim 6, it is characterized in that described overvoltage crowbar comprises the 4th Schmidt trigger, be connected on power supply and for the 4th Schmidt trigger provides the bleeder circuit of dividing potential drop, and be connected to the switching diode of the 4th Schmidt trigger output; When supply voltage is too high, the input signal of the 4th Schmidt trigger impels the 4th Schmidt trigger upset, the 4th Schmidt trigger upset is low-level output signal, the output signal of the first Schmidt trigger by switching diode by the 4th Schmidt trigger earth potential of releasing.
8. electronic horn drive circuit according to claim 1, is characterized in that described drive circuit comprises power amplification circuit, and described power amplification circuit drives the driving signal of loudspeaker based on pulse signal genration.
9. a driving method for electronic horn, described method comprises that the first Schmidt trigger utilizes state conversion to produce the pulse signal with duty ratio, utilizes this pulse signal to drive electronic horn sounding.
10. driving method according to claim 9, is characterized in that described method comprises by adjusting the signal of the first Schmidt trigger input, changes pulse duration and the frequency of pulse signal.
11. driving methods according to claim 10, it is characterized in that described method comprises that the input sound intensity when sound transducer reaches certain limit, when the output voltage signal of sound transducer reaches the second Schmidt trigger threshold value, the second Schmidt trigger work, thereby the signal of adjustment the first Schmidt trigger input.
12. driving methods according to claim 10, it is characterized in that described method comprises that the resistance when thermistor reaches certain limit, the level that thermistor produces reaches the threshold value of the 3rd Schmidt trigger, the 3rd Schmidt trigger work, thereby the voltage signal of adjustment the first Schmidt trigger input.
13. driving methods according to claim 10, is characterized in that comprising utilizing being connected to the voltage follower circuit between supply voltage and the input of the first Schmidt trigger, change the pulse duration of described pulse signal when mains voltage variations.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310117819.1A CN104105029B (en) | 2013-04-07 | 2013-04-07 | A kind of method and circuit adjusting electronic horn drive signal pulse width |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310117819.1A CN104105029B (en) | 2013-04-07 | 2013-04-07 | A kind of method and circuit adjusting electronic horn drive signal pulse width |
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| Publication Number | Publication Date |
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| CN104105029A true CN104105029A (en) | 2014-10-15 |
| CN104105029B CN104105029B (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310117819.1A Active CN104105029B (en) | 2013-04-07 | 2013-04-07 | A kind of method and circuit adjusting electronic horn drive signal pulse width |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274357A (en) * | 2018-09-21 | 2019-01-25 | 昆明理工大学 | A kind of duty ratio pulse modulated circuit not varying with frequency and its modulator approach |
| CN110213689A (en) * | 2019-07-04 | 2019-09-06 | 顾康 | A kind of speaker circuit bearing 220V high voltage |
| CN111479198A (en) * | 2020-04-09 | 2020-07-31 | 维沃移动通信有限公司 | Audio signal processing method and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152159A (en) * | 1995-12-14 | 1997-06-18 | 蒋华东 | Digital multi-tone contactless electronic vehicle horn |
| CN2485747Y (en) * | 2001-04-19 | 2002-04-10 | 苏祥华 | Electronic loudspeaker |
| CN201638550U (en) * | 2009-09-29 | 2010-11-17 | 广州市赛歌汽车零配件有限公司 | Vehicle electronic horn in following control |
| CN202102709U (en) * | 2011-06-10 | 2012-01-04 | 东莞市赛歌汽车零配件有限公司 | Resonance-controlled vehicle electronic horn |
-
2013
- 2013-04-07 CN CN201310117819.1A patent/CN104105029B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152159A (en) * | 1995-12-14 | 1997-06-18 | 蒋华东 | Digital multi-tone contactless electronic vehicle horn |
| CN2485747Y (en) * | 2001-04-19 | 2002-04-10 | 苏祥华 | Electronic loudspeaker |
| CN201638550U (en) * | 2009-09-29 | 2010-11-17 | 广州市赛歌汽车零配件有限公司 | Vehicle electronic horn in following control |
| CN202102709U (en) * | 2011-06-10 | 2012-01-04 | 东莞市赛歌汽车零配件有限公司 | Resonance-controlled vehicle electronic horn |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274357A (en) * | 2018-09-21 | 2019-01-25 | 昆明理工大学 | A kind of duty ratio pulse modulated circuit not varying with frequency and its modulator approach |
| CN110213689A (en) * | 2019-07-04 | 2019-09-06 | 顾康 | A kind of speaker circuit bearing 220V high voltage |
| CN111479198A (en) * | 2020-04-09 | 2020-07-31 | 维沃移动通信有限公司 | Audio signal processing method and electronic equipment |
| CN111479198B (en) * | 2020-04-09 | 2021-11-12 | 维沃移动通信有限公司 | Audio signal processing method and electronic equipment |
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| CN104105029B (en) | 2019-05-14 |
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