CN203368726U - Circuit capable of adjusting pulse width of electronic horn driving signals - Google Patents
Circuit capable of adjusting pulse width of electronic horn driving signals Download PDFInfo
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- CN203368726U CN203368726U CN 201320168320 CN201320168320U CN203368726U CN 203368726 U CN203368726 U CN 203368726U CN 201320168320 CN201320168320 CN 201320168320 CN 201320168320 U CN201320168320 U CN 201320168320U CN 203368726 U CN203368726 U CN 203368726U
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- schmidt trigger
- circuit
- electronic horn
- signal
- drive signal
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Abstract
The utility model provides a circuit capable of adjusting the pulse width of electronic horn driving signals, which is characterized in that 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 utility model 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 the vehicle electronic loudspeaker, more particularly relate to the circuit 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 progressively to be widely used in automobile industry.But because the 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 that embed single-chip microcomputer (but cost is higher), the feedback signals such as the sound that the ordinary electronic loudspeaker cause vehicle body to produce by state of ground during for engine, air conditioner, gearbox and driving when signal is processed and vibration signal are not processed, and stability, reliability and consistency while causing loudspeaker are worked have larger impact.
Summary of the invention
The purpose of this invention is to provide the Method and circuits that the adjustment electronic horn that can overcome above problem drives signal stabilization.
According to first aspect, the invention provides a kind of circuit of adjusting electronic horn drive signal impulse width, comprise the first Schmidt trigger, described the first Schmidt trigger utilizes the state conversion to produce the pulse signal with duty ratio, and the circuit of adjusting electronic horn drive signal impulse width utilizes this pulse signal to drive the 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.
The circuit of described adjustment electronic horn drive signal impulse width preferably includes voltage follower circuit, this voltage follower circuit is connected between the input of supply voltage and the first Schmidt trigger, thereby adjusts the signal of the input of the first Schmidt trigger.The circuit of this adjustment electronic horn drive signal impulse width 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, thereby adjust the signal of the first Schmidt trigger input.The circuit of described adjustment electronic horn drive signal impulse width preferably includes the temperature protection circuit with the 3rd Schmidt trigger and thermistor; by changing the output signal of the 3rd Schmidt trigger, thereby adjust the voltage signal of the first Schmidt trigger input.This circuit further preferably includes the excess voltage protection with the 4th Schmidt trigger, thereby has influence on the signal of the first Schmidt trigger output by the signal that changes the 4th Schmidt trigger output.
According to second aspect, the invention provides a kind of method of adjusting electronic horn drive signal impulse width, described method comprises: the first Schmidt trigger utilizes the state conversion to produce the pulse signal with duty ratio, utilizes this pulse signal to drive the electronic horn sounding; The signal produced by sound transducer makes the second Schmidt trigger work, thereby adjusts the signal of the first Schmidt trigger input; The voltage signal produced by thermistor makes the 3rd Schmidt trigger work, thereby adjusts the signal of the first Schmidt trigger input; By adjusting the pulse duration of the first Schmidt trigger output end signal, the loudspeaker operating current is stablized and made loudspeaker remain on the preferably step of resonance working point.
The accompanying drawing explanation
Fig. 1 is the principle schematic according to adjustment electronic horn drive signal impulse width circuit of the present invention;
Fig. 2 is the schematic diagram according to the adjustment electronic horn drive signal impulse width 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 the principle schematic according to adjustment electronic horn drive signal impulse width 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.Produce level by sound transducer, 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 the Current Temperatures feedback signal.Because the resistance of thermistor can change along with the variation of temperature, the voltage signal produced 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, in order to drive the loudspeaker electromagnet coil.Power drive unit 15 can adopt the device realizations such as transistor.
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 as current loudspeaker operating voltage, being greater than a certain value, 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 the schematic diagram according to the adjustment electronic horn drive signal impulse width circuit of the embodiment of the present invention.In the circuit of this adjustment electronic horn drive signal impulse width, with Schmidt trigger, the frequency and the pulsewidth that drive signal are adjusted.
The circuit of described adjustment electronic horn drive signal impulse width comprises that loudspeaker drive signal generator to divide.The circuit of this adjustment electronic horn drive signal impulse width 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, then is 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 forms by switching diode D3 and resistance R 6 is charged to capacitor C 2; When the first Schmidt trigger Q1 input level reaches forward threshold voltage, the circuit reversion, now the output of the first Schmidt trigger Q1 is low level, capacitor C 2 is discharged, because its series circuit formed by resistance R 7 and switching diode D4 is connected to the output of the first Schmidt trigger Q1, so discharge to the ground end by the first Schmidt trigger Q1 that connects power supply negative terminal.Along with the output level of the first Schmidt trigger Q1 reduces and while reaching the negative sense threshold voltage, circuit reverses again gradually, the first Schmidt trigger Q1 continues the 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.Be connected with the parallel circuits that a diode D6 and capacitor C 4 form between the drain electrode of field effect transistor T1 and source electrode.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.Connecting loudspeaker (SP) between the negative pole of the drain electrode of field effect transistor T1 and diode D1.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, the circuit of adjusting electronic horn drive signal impulse width comprises the 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.
Produce voltage when sound transducer receives certain loudness of a sound, and be input to the input of the second Schmidt trigger Q2.When the work loudness of a sound of sound transducer for example is 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, can change with this 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 the problem that in time-base circuit, amplifier is not only processed the feedback signal amplification in the prior art, improved to a great extent the stability of loudspeaker work.
In addition, the output electrical signals of sound transducer has the 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, the circuit of adjusting electronic horn drive signal impulse width 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, and the thermistor that adopts positive temperature coefficient is also feasible only R1, R2 should be exchanged to Wei Ge.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 from 5 pairs of capacitor C 2 of resistance R, providing charging current, provide charging current from 3 pairs of capacitor C 2 of resistance R 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, the circuit of adjusting electronic horn drive signal impulse width 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 the loudspeaker supply power voltage for example surpasses 20V, the partial pressure value of the voltage divider be 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, the 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 the 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; purpose 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 be 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 (7)
1. a circuit of adjusting electronic horn drive signal impulse width, it is characterized in that, comprise the first Schmidt trigger, described the first Schmidt trigger utilizes the state conversion to produce the pulse signal with duty ratio, and the circuit of adjusting electronic horn drive signal impulse width utilizes this pulse signal to drive the electronic horn sounding.
2. the circuit of adjustment electronic horn drive signal impulse width according to claim 1, it is characterized in that comprising voltage follower circuit, this voltage follower circuit is connected between the input of supply voltage and the first Schmidt trigger, in order to change the pulse duration of described pulse signal when mains voltage variations.
3. the circuit of adjustment electronic horn drive signal impulse width according to claim 1, the circuit that it is characterized in that described adjustment electronic horn drive signal impulse width comprises the acoustic feedback signal treatment circuit with the second Schmidt trigger and sound transducer, when the voltage signal of sound transducer output reaches the second Schmidt trigger threshold value, the second Schmidt trigger work, thus the voltage signal of the first Schmidt trigger input adjusted.
4. the circuit of adjustment electronic horn drive signal impulse width according to claim 1; the circuit that it is characterized in that described adjustment electronic horn drive signal impulse width comprises the temperature protection circuit with the 3rd Schmidt trigger and thermistor; when the voltage signal that temperature protection circuit is exported with resistance and the thermistor after the change of this resistance of the variation change thermistor of ambient temperature reaches the 3rd Schmidt trigger threshold value; the 3rd Schmidt trigger work, thus the voltage signal of the first Schmidt trigger input adjusted.
5. the circuit of adjustment electronic horn drive signal impulse width according to claim 1, is characterized in that the circuit of described adjustment electronic horn drive signal impulse width comprises an excess voltage protection.
6. the circuit of adjustment electronic horn drive signal impulse width according to claim 1, the circuit that it is characterized in that described adjustment electronic horn drive signal impulse width comprises power amplification circuit, and described power amplification circuit drives the driving signal of loudspeaker based on pulse signal genration.
7. the circuit of adjustment electronic horn drive signal impulse width according to claim 5, it is characterized in that, described a kind of excess voltage protection, comprise 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320168320 CN203368726U (en) | 2013-04-07 | 2013-04-07 | Circuit capable of adjusting pulse width of electronic horn driving signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320168320 CN203368726U (en) | 2013-04-07 | 2013-04-07 | Circuit capable of adjusting pulse width of electronic horn driving signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203368726U true CN203368726U (en) | 2013-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320168320 Expired - Lifetime CN203368726U (en) | 2013-04-07 | 2013-04-07 | Circuit capable of adjusting pulse width of electronic horn driving signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203368726U (en) |
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2013
- 2013-04-07 CN CN 201320168320 patent/CN203368726U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Harbin Wanyu Technology Co.,Ltd. Assignor: Wan Yu Contract record no.: 2014230000471 Denomination of utility model: Circuit capable of adjusting pulse width of electronic horn driving signals Granted publication date: 20131225 License type: Exclusive License Record date: 20140827 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |