CN104105029B - A kind of method and circuit adjusting electronic horn drive signal pulse width - Google Patents
A kind of method and circuit adjusting electronic horn drive signal pulse width Download PDFInfo
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- CN104105029B CN104105029B CN201310117819.1A CN201310117819A CN104105029B CN 104105029 B CN104105029 B CN 104105029B CN 201310117819 A CN201310117819 A CN 201310117819A CN 104105029 B CN104105029 B CN 104105029B
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- schmidt trigger
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- driving circuit
- electronic horn
- voltage
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Abstract
The method that the present invention proposes a kind of electronic horn driving circuit and driving electronic horn.First Schmidt trigger of electronic horn driving circuit, first Schmidt trigger generate the pulse signal with duty ratio using state conversion, and driving circuit drives electronic horn sounding using the pulse signal.The method overcomes the previous electronic horn using production such as time base circuit, amplifying circuits, and vulnerable to automobile itself, the feedback signals such as other mechanical sound generated and vibration interfere the drawbacks of being unable to steady operation.
Description
Technical field
The present invention relates to vehicle electronic loudspeaker, more particularly to Schmidt trigger adjustment electronic horn driving letter
The method and circuit of number pulse width.
Background technique
At present automobile electronic loudspeaker due to the service life it is long, electromagnetic radiation is low etc., and advantages start gradually to make extensively in automobile industry
With.But since loudspeaker manufacturing process is influenced by raw material consistency, use environment and every loudspeaker also will affect using the time
Resonance frequency, in addition to the full intelligent horn of computer of insertion single-chip microcontroller (but higher cost), ordinary electronic loudspeaker are at signal
Lead to sound and the vibration signal etc. of vehicle body generation when reason for engine, air conditioner, gearbox and driving by state of ground
Feedback signal is not handled, and stability, reliability and the consistency when working loudspeaker is caused to have large effect.
Summary of the invention
The object of the present invention is to provide the methods for the adjustment electronic horn driving signal stability that can overcome problem above
And circuit.
According in a first aspect, the present invention provides a kind of electronic horn driving circuit, including the first Schmidt trigger, institute
It states the first Schmidt trigger and generates the pulse signal with duty ratio using state conversion, driving circuit utilizes the pulse signal
Drive electronic horn sounding.It is characterized in that changing pulse letter by adjusting the first Schmidt trigger input terminal voltage signal
Number pulse width.
The electronic horn driving circuit preferably includes voltage follower circuit, which is connected to power supply electricity
Between pressure and the input terminal of the first Schmidt trigger, so as to adjust the signal of the input terminal of the first Schmidt trigger.The drive
Dynamic circuit further preferably includes the acoustic feedback signal processing circuit with the second Schmidt trigger and sound transducer, is led to
The output signal of the second Schmidt trigger is crossed, so as to adjust the signal of the first Schmidt trigger input terminal.
The electronic horn driving circuit preferably includes have the temperature of third Schmidt trigger and thermistor guarantor
Protection circuit, by changing the output signal of third Schmidt trigger, so as to adjust the electricity of the first Schmidt trigger input terminal
Press signal.The circuit further preferably includes the excess voltage protection with the 4th Schmidt trigger, by changing the 4th
The signal of Schmidt trigger output end is to influence the signal of the first Schmidt trigger output end.
According to second aspect, the present invention provides a kind of method for driving electronic horn, which comprises the first Schmidt
Trigger generates the pulse signal with duty ratio using state conversion, drives electronic horn sounding using the pulse signal；It is logical
The signal for crossing sound transducer generation makes the second Schmidt trigger work, so as to adjust the first Schmidt trigger input terminal
Signal；Third Schmidt trigger is set to work by the voltage signal that thermistor generates, so as to adjust the first schmidt trigger
The signal of device input terminal；By adjusting the pulse width of the first Schmidt trigger output end signal, keep loudspeaker operating current steady
The step of determining and loudspeaker made to be maintained at preferable resonant operational point.
Detailed description of the invention
Fig. 1 is the schematic illustration of electronic horn driving circuit according to the present invention；
Fig. 2 is the schematic diagram of the driving circuit of embodiment according to the present invention.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Fig. 1 is the schematic illustration of electronic horn driving circuit according to the present invention.As shown in Figure 1, the circuit includes electricity
Source supply portion 11, acoustic feedback signal processing unit 12, temperature protection unit 13, drive signal generation unit 14, power drive
Moving cell 15 and overvoltage protective unit 16.
Power supply part 11 generates regulated power supply by a voltage regulator circuit, and is supplied to each unit.
The feedback signal of the generation current sound of acoustic feedback signal processing unit 12.Level is generated by sound transducer,
The output end of its input terminal for acting on the second Schmidt trigger, the second Schmidt trigger generates train of pulse.
Temperature protection unit 13 generates Current Temperatures feedback signal.Since the resistance value of thermistor can be with the variation of temperature
And change, it is applied to the input terminal of third Schmidt trigger according to the voltage signal that the change in resistance of thermistor generates, changes
Become the output pulse width of the first Schmidt trigger.
The reception acoustic feedback signal processing unit 12 of drive signal generation unit 14 and temperature protection unit 13 export anti-
Feedback signal, the input terminal which is applied to the first Schmidt trigger carries out following processing to its circuit toggle frequency, and controls
The pulse width of output end signal processed makes loudspeaker that can work on preferable resonance point always.
15 pulse-width of power drive unit signal adjusted carries out power amplification, to drive loudspeaker electromagnetism iron wire
Circle.The realization of the devices such as transistor can be used in power drive unit 15.
Overvoltage protecting unit 16 is by the way that under current loudspeaker operating voltage, divider resistance generates different level and acts on
The input terminal of four Schmidt triggers, thus the first Schmidt trigger output end signal of control.Such as current loudspeaker operating voltage
The 4th Schmidt trigger output end exports low level signal, the output that drive signal generation unit 14 generates when greater than a certain value
Signal is released to ground potential by the 4th Schmidt trigger by switching diode, and driving unit 15 is caused to stop working.
Fig. 2 is the schematic diagram of driving circuit according to an embodiment of the present invention.Schmidt trigger is used in the driving circuit
The frequency and pulsewidth of driving signal are adjusted.
The driving circuit includes loudspeaker drive signal generating unit point.The driving circuit can also include power suppling part
Point, power amplifying part, acoustic feedback signal handles part, temperature protection part and overvoltage protection part
Power suppling part point includes a serial regulating circuit, the serial regulating circuit may include switching diode D7,
Current-limiting resistance R11 and zener diode DW1.The anode of switching diode D7 is connected with power positive end, negative terminal and resistance R11 phase
Even.Capacitor C3 is in parallel with zener diode DW1, is then connected between the cathode of power supply and resistance R11, thus provides and stablizes electricity
Pressure.
It may include two switching diodes D3, D4, resistance R6, R7, the first Schmidt that loudspeaker drive signal generating unit, which is divided to,
Trigger Q1 and capacitor C2.Switching diode D3, resistance R6 constitute series circuit, and switching diode D4, resistance R7 constitute series connection
Circuit, the two series circuits are connected in parallel between the input terminal and output end of the first Schmidt trigger Q1.Switching diode D3
Anode, the negative terminal of switching diode D4 intersects with the output end of Schmidt trigger.The output end of Schmidt trigger passes through
Resistance R10 is connected with field-effect tube T1.The input terminal of first Schmidt trigger Q1 is connected by capacitor C2 with power supply negative terminal.
Loudspeaker drive signal generating unit point can also include an electricity in series by switching diode D2 and resistance R5
Pressure follows circuit.The anode of switching diode D2 is connected with the cathode of diode D7, and thus provide supply voltage follows signal
And change the level of the first Schmidt trigger Q1 input terminal, to change the pulse width of loudspeaker driving signal.
In the course of work, power supply variation is superimposed upon to the input terminal of the first Schmidt trigger Q1, and to capacitor C2
It charges, the first Schmidt trigger Q1 input terminal is low level and gradually rises that output signal passes through two pole of switch at this time
The series circuit of pipe D3 and resistance R6 composition charges to capacitor C2；When the first Schmidt trigger Q1 input terminal level reaches
When forward threshold voltage, circuit reversion, the output end of the first Schmidt trigger Q1 is low level at this time, and capacitor C2 is put
Electricity, since it is connected to by the series circuit that resistance R7 and switching diode D4 are formed the output of the first Schmidt trigger Q1
End, therefore discharged by the first Schmidt trigger Q1 of connection power supply negative terminal to ground terminal.With the first Schmidt trigger Q1
Output end level when gradually decreasing and reaching negative sense threshold voltage, circuit inverts again, and the first Schmidt trigger Q1 continues
Export high level signal.Capacitor C2 continues to charge, and repeats the above process, and generates pulse signal.
Power amplifying part includes a field-effect tube T1.The grid of field-effect tube T1 is connected to loudspeaker by resistance R10
Drive signal generating unit divides output end, receives the output pulse signal with certain pulse width.The source electrode of field-effect tube T1 connects
It is connected to power supply negative terminal.The parallel connection electricity that diode D6 and capacitor C4 is constituted is connected between the drain electrode and source electrode of field-effect tube T1
Road.The anode of diode D6 is connected with the source electrode of field-effect tube T1.Field-effect tube T1, diode D6, capacitor C4 form a suction
Receive protection circuit.Loudspeaker (SP) is connected between the drain electrode of field-effect tube T1 and the cathode of diode D1.The drive of scene effect pipe
Under dynamic, sound horn.
By in the first Schmidt trigger Q1 input terminal superposed signal, to influence the reversion of the first Schmidt trigger Q1
Time, to change the duty ratio of loudspeaker driving signal.
In one example, with the increase of supply voltage, the first Schmidt trigger Q1 reduces output driving letter automatically
Number pulse width, also reduce the operating current of loudspeaker, this maintains the stabilization of loudspeaker operating current to a certain extent.
Loudspeaker are piped on preferably setting operating point.
In another example, driving circuit includes acoustic feedback signal processing part.The acoustic feedback signal processing unit
Dividing may include resistance R4, sound transducer MIC, the second Schmidt trigger Q2 and capacitor C1.Resistance R4 and sound transducer
The series circuit of MIC composition is connected between the anode of power supply and cathode, the input terminal and resistance of the second Schmidt trigger Q2
R4, the tie point of sound transducer MIC are connected, and output end passes through the input of the first Schmidt trigger of capacitor C1 connection Q1
End.
Voltage is generated when sound transducer receives certain loudness of a sound, and is input to the input of the second Schmidt trigger Q2
End.When the work loudness of a sound of sound transducer is not less than such as 90db, the second Schmidt trigger Q2 input terminal reaches triggering electricity
Flat, output signal is input to the input terminal of the first Schmidt trigger Q1 through the blocking processing of capacitor C1, can change with this
The pulse width of loudspeaker driving signal, to change the working frequency of loudspeaker.Efficiently reduce in this way other less than 90db and
It is influenced caused by vibration and noise signals, has prevented in the prior art only to amplify feedback signal using amplifier in time base circuit
The problem of without handling, largely improves the stability of loudspeaker work.
In addition, the output electric signal of sound transducer has certain frequency range, which includes the preferable of loudspeaker
Resonance frequency.Such electric signal is output to the input terminal of the first Schmidt trigger Q1 by capacitor C1, and thus changes electricity
Hold the charge rate of C2, thus changes the pulse signal (and driving signal of loudspeaker) of the first Schmidt trigger Q1 output
Frequency, finally make loudspeaker work in preferable operating point.
In another example, driving circuit includes a temperature protection part.The temperature protection part may include heat
Quick resistance R1, resistance R2, R3, third Schmidt trigger Q3 and switching diode D1.The series connection of thermistor R1 and resistance R2
It is electrically connected between power positive cathode, and constitutes the bleeder circuit to third Schmidt trigger Q3 input terminal.Resistance R3,
Switching diode D1 constitutes series circuit.The output end of third Schmidt trigger Q3 is connected with resistance R3.Switching diode D1
Anode be connected with resistance R3, negative terminal is connected with the input terminal of the first Schmidt trigger Q1.
In Fig. 2, thermistor can be negative temperature coefficient.Certainly, skilled in the art realises that, using positive temperature system
Several thermistors be also it is feasible only should be by R1, R2 transposition.The resistance value of thermistor R1 applies third close when room temperature
Special trigger Q3 conducting, third Schmidt trigger Q3 output end are low level, and output signal is switched on and off diode D1 blocking.
When temperature is lower than subzero ten degree, thermistor R1 resistance value is increased, and reaches the voltage of the input terminal of third Schmidt trigger Q3
Triggering level and overturn, output end is high level, and output signal is input to the first Schmidt trigger through switching diode D1
The input terminal of Q1.Due to not only providing charging current to capacitor C2 from resistance R5 to capacitor C2 offer charging current, but also from resistance R3,
The charging rate of capacitor C2 is improved, the pulse width of loudspeaker driving signal is reduced, thus effective solution loudspeaker low temperature abnormal sound
The problem of.
In further example, driving circuit includes an overvoltage protection part.The overvoltage protection part may include one
A bleeder circuit in series by resistance R8, R9 and the 4th Schmidt trigger Q4 and switching diode D5.Resistance R8, R9
The bleeder circuit of composition is connected between positive pole, negative grade, and is provided for the input terminal of the 4th Schmidt trigger Q4 defeated
Enter voltage.The anode of switching diode D5 is connected with the tie point of the grid of field-effect tube T1 and resistance R10, and cathode is applied with the 4th
The output end of schmitt trigger Q4 connects.
When loudspeaker supply voltage is more than such as 20V, a fixed number is reached by the partial pressure value of resistance R8, R9 divider formed
Value, makes the output end low level of the 4th Schmidt trigger Q4, switching diode D5 is got through, and R10 output signal passes through switch
Diode D5 is released to ground voltage by the 4th Schmidt trigger, and field-effect tube T1 stops output at this time.When loudspeaker supply voltage
It gradually decreases, the voltage divider value of resistance R8, R9 composition gradually decreases, and the output end of the 4th Schmidt trigger Q4 is high electricity
Flat, switching diode D5 is closed, and institute's output signal is switched on and off diode D5 cut-off, and field-effect tube T1 restores normal output.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (11)
1. a kind of electronic horn driving circuit, including the first Schmidt trigger, first Schmidt trigger utilizes state
Conversion generates the pulse signal with duty ratio, and driving circuit drives electronic horn sounding using the pulse signal；
The driving circuit changes the pulse of pulse output signals by adjusting the first Schmidt trigger input terminal voltage signal
Width.
2. electronic horn driving circuit according to claim 1, it is characterised in that including voltage follower circuit, the voltage with
With being electrically connected between supply voltage and the input terminal of the first Schmidt trigger, to change institute in mains voltage variations
State the pulse width of pulse signal.
3. electronic horn driving circuit according to claim 1, it is characterised in that the driving circuit includes having second
The acoustic feedback signal processing circuit of Schmidt trigger and sound transducer, when the input sound intensity of sound transducer reaches certain
When the voltage signal that range and sound transducer export reaches the second Schmidt trigger threshold value, the second Schmidt trigger work
Make, so as to adjust the voltage signal of the first Schmidt trigger input terminal.
4. electronic horn driving circuit according to claim 1, it is characterised in that the driving circuit includes having third
The temperature protection circuit of Schmidt trigger and thermistor, temperature protection circuit change thermistor with the variation of environment temperature
Resistance value and the resistance value change after thermistor output voltage signal when reaching third Schmidt trigger threshold value, third is applied
Schmitt trigger work, so as to adjust the voltage signal of the first Schmidt trigger input terminal.
5. electronic horn driving circuit according to claim 1, it is characterised in that the driving circuit includes one excessively electric
Voltage protection circuit.
6. electronic horn driving circuit according to claim 5, it is characterised in that the overvoltage crowbar includes the 4th
Schmidt trigger is connected on power supply and provides the bleeder circuit of partial pressure for the 4th Schmidt trigger, and is connected to the 4th
The switching diode of Schmidt trigger output end；When supply voltage is excessively high, the input signal of the 4th Schmidt trigger promotees
Overturn the 4th Schmidt trigger, the overturning of the 4th Schmidt trigger is low-level output signal, the first Schmidt trigger
Output signal ground potential is released to by the 4th Schmidt trigger by switching diode.
7. electronic horn driving circuit according to claim 1, it is characterised in that the driving circuit includes power amplification
Circuit, the power amplification circuit generate the driving signal of driving loudspeaker based on pulse signal.
8. a kind of driving method of electronic horn, being generated the method includes the first Schmidt trigger using state conversion is had
The pulse signal of duty ratio drives electronic horn sounding using the pulse signal；
Wherein, by adjusting the signal of the first Schmidt trigger input terminal, change the pulse width and frequency of pulse signal.
9. driving method according to claim 8, it is characterised in that the method includes working as the input sound of sound transducer
Reach a certain range by force, when the output voltage signal of sound transducer reaches the second Schmidt trigger threshold value, the second Schmidt
Flip-flop operation, so as to adjust the signal of the first Schmidt trigger input terminal.
10. driving method according to claim 8, it is characterised in that the method includes the resistance values when thermistor to reach
A certain range, the level that thermistor generates reach the threshold value of third Schmidt trigger, and third Schmidt trigger works, from
And adjust the voltage signal of the first Schmidt trigger input terminal.
11. driving method according to claim 8, it is characterised in that including the use of be connected to supply voltage and first apply it is close
Voltage follower circuit between the input terminal of special trigger, the pulse for changing the pulse signal in mains voltage variations are wide
Degree.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 CN104105029A (en) | 2014-10-15 |
| CN104105029B true CN104105029B (en) | 2019-05-14 |
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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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109274357B (en) * | 2018-09-21 | 2023-07-18 | 昆明理工大学 | Pulse modulation circuit with duty ratio unchanged with frequency and modulation method thereof |
| CN110213689A (en) * | 2019-07-04 | 2019-09-06 | 顾康 | A kind of speaker circuit bearing 220V high voltage |
| 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 |
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 |
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| CN104105029A (en) | 2014-10-15 |
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