CN104539240A - Coupled oscillatory circuit with leakage protection function for vehicle detection - Google Patents
Coupled oscillatory circuit with leakage protection function for vehicle detection Download PDFInfo
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- CN104539240A CN104539240A CN201410651590.4A CN201410651590A CN104539240A CN 104539240 A CN104539240 A CN 104539240A CN 201410651590 A CN201410651590 A CN 201410651590A CN 104539240 A CN104539240 A CN 104539240A
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Abstract
The invention discloses a coupled oscillatory circuit with a leakage protection function for vehicle detection. The coupled oscillatory circuit comprises a leakage protector, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an audion T, a coupling transformer T1, an annular coil L, a comparator A, and a transient voltage suppressor D, wherein the annular coil L is connected between an a end and a b end of the coupling transformer T1, the transient voltage suppressor D is parallelly connected at two ends of the annular coil L, a reverse diode D1 and a diode D2 are sequentially cascaded between a c end and a d end of the coupling transformer T1, a base set of the audion T is sequentially connected with the leakage protector, the resistor R1 and a power supply voltage to current converter (VCC), the capacitor C2 is also connected between an emitter electrode and a collector electrode of the audion T, and the emitter electrode of the audion T is also connected with the pull-down capacitor C1. Through adoption of the coupled oscillatory circuit, the transformer cannot be damaged by transient high voltage, and the comparator is protected from being damaged by high voltage so as not to play shaping function; furthermore, due to the leakage protector, the coupled oscillatory circuit lowers potential safety hazard and is safer to use.
Description
Technical field
The present invention relates to field of vehicle detection, be specifically related to the vehicle detection coupled oscillatory circuit with leakage protection.
Background technology
Along with expanding economy, intelligent transportation is quietly risen in China, and wagon detector, as an important component part of traffic information collection, more and more receives the concern of insider.Wagon detector is detect target with motor vehicles, detect passing through or existence of vehicle, its effect provides enough information to carry out optimum control for intelligent traffic control system, wagon detector conventional in the world at present mainly contains Loop Vehicle Detector, video-based vehicle detection and microwave vehicle detector, wherein Loop Vehicle Detector is due to its high-accuracy, low cost, and high reliability and being widely used.And in wagon detector, usually need to add coupled oscillatory circuit; need to use transformer, triode etc. in coupled oscillatory circuit; transformer in the coupled oscillatory circuit of now in wagon detector is easily damaged by instantaneous pressure; comparator is easily burnt out by the too high voltages that loop coil produces; affect it and play shaping operation; and in existing coupling oscillating circuit, leakage protection structure is not set, there is potential safety hazard.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art; the vehicle detection coupled oscillatory circuit with leakage protection is provided; transformer in this circuit is not easily damaged by instantaneous pressure; protecting comparing, avoiding it to be damaged by higher voltage, cannot shaping operation be played; in addition; in this circuit, also earth leakage protective device is set, reduces potential safety hazard, use safer.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: the vehicle detection coupled oscillatory circuit with leakage protection, comprise earth leakage protective device, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, triode T, coupling transformer T1, loop coil L, comparator A, diode D1, diode D2 and moment twin zener dioder D, loop coil L is connected between a end of described coupling transformer T1 and b end, moment, twin zener dioder D was connected in parallel on loop coil L two ends, series diode D1 and diode D2 and diode D1 and diode D2 reversal connection successively between c end and the d end of coupling transformer T1, the c end of coupling transformer T1 goes back the collector electrode of contact resistance R4 and triode T simultaneously, the basis set of described triode T connects earth leakage protective device, resistance R1 and power supply VCC successively, the emitter contact resistance R3 and power supply VCC successively of triode T, between the emitter and collector of triode T, also connect electric capacity C2, the emitter of triode T also connects drop-down electric capacity C1, the contact resistance of the input in the same way R5 of the reverse input end contact resistance R4 of described comparator A, comparator A, resistance R5 ground connection, the output contact resistance R6 and power supply VCC successively of comparator A, the output of comparator A also connects output signal end Vout.
After triode T basis set switches on power; loop coil is produced inductance and is just then flowed out by electric capacity C2, electric capacity C1 successively through over-coupled transformer process rear portion; a part flows into resistance R4; and then pass to comparator A; avoid excessive voltage damage comparison device A; comparator is protected, better can play shaping operation.Also avoid excessive voltage to flow on triode T simultaneously, cause the damage of triode, make triode realize on-off action.Also connect earth leakage protective device at the basis set of triode T simultaneously, when discovery leak current fault, when finding dangerous, realize overload and short-circuit protection, reduce potential safety hazard, use safer.
When motor vehicle is through loop coil L, due to himself irony toroidal inductance value is reduced, then by inductance by after coupling transformer process, pure oscillation signal after process can be exported from signal output part Vout after the preliminary shaping of comparator A as long as triode T basis set switches on power, thus reach the inductance of generation is changed through the frequency of oscillation of coupled oscillatory circuit, coupling transformer can determine whether motor vehicle by corresponding loop coil by the counted number of pulses of unit interval section.
A moment twin zener dioder D is also set between a end of coupling transformer T1 wherein and b end for suppressing the instantaneous pressure produced by reasons such as electrostatic to the damage of coupling transformer, diode D1 and D2 of two reversal connections is also set between the c end and d end of coupling transformer T1, make to be suppressed between negative 5V to positive 5V by the pure oscillation signal of coupling transformer, the excessive voltage avoiding loop coil to produce further causes damage to coupling transformer.The emitter of triode T connects drop-down electric capacity C1, for the impact of filtering harmonic wave on triode T.
Described electric capacity C1 is equal with electric capacity C2 capacitance.
The described basis set at triode T also connects pull down resistor R2.Also arrange pull down resistor R2 for separating of falling a part of voltage at the basis set of the triode T as on-off action, protection triode T, avoids because of too high voltage breakdown triode T.
The d of described diode D2 and coupling transformer T1 holds equal ground connection.
Described resistance R4, resistance R5 are equal with resistance R6 resistance.
Compared with prior art, the invention has the beneficial effects as follows:
1, a of coupling transformer T1 holds and also arrange a moment twin zener dioder D for suppressing the instantaneous pressure produced by reasons such as electrostatic to the damage of coupling transformer between b end, diode D1 and D2 of two reversal connections is also set between the c end and d end of coupling transformer T1, make to be suppressed between negative 5V to positive 5V by the pure oscillation signal of coupling transformer, the excessive voltage avoiding loop coil to produce further causes damage to coupling transformer.
2, electric capacity C2 is set between the emitter and collector of triode T; for separating of a part of voltage falling loop coil generation; excessive voltage is avoided to flow through comparator A and triode T causes damage; comparator A is made to play shaping operation; in addition; in this circuit, also earth leakage protective device is set, reduces potential safety hazard, use safer.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the present invention includes earth leakage protective device, electric capacity C1 is 0.1 microfarad, electric capacity C2 is 0.1 microfarad, resistance R1 is 5.6 kilo-ohms, resistance R2 is 5.6 kilo-ohms, resistance R3 is 330 kilo-ohms, resistance R4 is 1 kilo-ohm, resistance R5 is 1 kilo-ohm, resistance R6 is 1 kilo-ohm, triode T, coupling transformer T1, loop coil L, the model of comparator A is LM339, diode D1 reverse breakdown voltage is 4.3V, diode D2 is 4.3V and moment twin zener dioder D model is P6KE12CA, loop coil L is connected between a end of described coupling transformer T1 and b end, moment, twin zener dioder D was connected in parallel on loop coil L two ends, series diode D1 and diode D2 and diode D1 and diode D2 reversal connection successively between c end and the d end of coupling transformer T1, the c end of coupling transformer T1 goes back the collector electrode of contact resistance R4 and triode T simultaneously, the basis set of described triode T connects earth leakage protective device, resistance R1 and power supply VCC successively, the emitter contact resistance R3 and power supply VCC successively of triode T, between the emitter and collector of triode T, also connect electric capacity C2, the emitter of triode T also connects drop-down electric capacity C1, the contact resistance of the input in the same way R5 of the reverse input end contact resistance R4 of described comparator A, comparator A, resistance R5 ground connection, the output contact resistance R6 and power supply VCC successively of comparator A, the output of comparator A also connects output signal end Vout.
When motor vehicle is through loop coil L, due to himself irony toroidal inductance value is reduced, then inductance the large voltage such as to be treated to by coupling transformer, then allow triode T basis set switch on power the pure oscillation signal after process to be exported from signal output part Vout after the preliminary shaping of comparator A, a part of voltage is wherein separated by electric capacity C2 and C3, thus reach the inductance of generation is changed through the frequency of oscillation of coupled oscillatory circuit, coupling transformer can determine whether motor vehicle by corresponding loop coil by the counted number of pulses of unit interval section.
After triode T basis set switches on power; loop coil is produced inductance and is just then flowed out by electric capacity C2, electric capacity C1 successively through over-coupled transformer process rear portion; a part flows into resistance R4; and then pass to comparator A; avoid excessive voltage damage comparison device A; comparator is protected, better can play shaping operation.Also avoid excessive voltage to flow on triode T simultaneously, cause the damage of triode, make triode realize on-off action.Also connect earth leakage protective device at the basis set of triode T simultaneously, when discovery leak current fault, when finding dangerous, realize overload and short-circuit protection, reduce potential safety hazard, use safer.
A moment twin zener dioder D is also set between a end of coupling transformer T1 wherein and b end for suppressing the instantaneous pressure produced by reasons such as electrostatic to the damage of coupling transformer, diode D1 and D2 of two reversal connections is also set between the c end and d end of coupling transformer T1, make to be suppressed between negative 5V to positive 5V by the pure oscillation signal of coupling transformer, the excessive voltage avoiding loop coil to produce further causes damage to coupling transformer.Also arrange pull down resistor R2 for separating of falling a part of voltage at the basis set of the triode T as on-off action, protection triode T, avoids because of too high voltage breakdown triode T.
Embodiment 2:
The present embodiment preferred concrete structure on the basis of embodiment 1 is as follows: described electric capacity C1 is equal with electric capacity C2 capacitance.
The described basis set at triode T also connects pull down resistor R2.Also arrange pull down resistor R2 for separating of falling a part of voltage at the basis set of the triode T as on-off action, protection triode T, avoids because of too high voltage breakdown triode T.
The d of described diode D2 and coupling transformer T1 holds equal ground connection.
Described resistance R4, resistance R5 are equal with resistance R6 resistance.
Just this invention can be realized as mentioned above.
Claims (5)
1. there is the vehicle detection coupled oscillatory circuit of leakage protection, it is characterized in that: comprise earth leakage protective device, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, triode T, coupling transformer T1, loop coil L, comparator A, diode D1, diode D2 and moment twin zener dioder D, loop coil L is connected between a end of described coupling transformer T1 and b end, moment, twin zener dioder D was connected in parallel on loop coil L two ends, series diode D1 and diode D2 and diode D1 and diode D2 reversal connection successively between c end and the d end of coupling transformer T1, the c end of coupling transformer T1 goes back the collector electrode of contact resistance R4 and triode T simultaneously, the basis set of described triode T connects earth leakage protective device, resistance R1 and power supply VCC successively, the emitter contact resistance R3 and power supply VCC successively of triode T, between the emitter and collector of triode T, also connect electric capacity C2, the emitter of triode T also connects drop-down electric capacity C1, the contact resistance of the input in the same way R5 of the reverse input end contact resistance R4 of described comparator A, comparator A, resistance R5 ground connection, the output contact resistance R6 and power supply VCC successively of comparator A, the output of comparator A also connects output signal end Vout.
2. the vehicle detection coupled oscillatory circuit with leakage protection according to claim 1, is characterized in that: described electric capacity C1 is equal with electric capacity C2 capacitance.
3. the vehicle detection coupled oscillatory circuit with leakage protection according to claim 1, is characterized in that: the described basis set at triode T also connects pull down resistor R2.
4. the vehicle detection coupled oscillatory circuit with leakage protection according to claim 1, is characterized in that: the d of described diode D2 and coupling transformer T1 holds equal ground connection.
5. the vehicle detection coupled oscillatory circuit with leakage protection according to claim 1, is characterized in that: described resistance R4, resistance R5 are equal with resistance R6 resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410651590.4A CN104539240A (en) | 2014-11-17 | 2014-11-17 | Coupled oscillatory circuit with leakage protection function for vehicle detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410651590.4A CN104539240A (en) | 2014-11-17 | 2014-11-17 | Coupled oscillatory circuit with leakage protection function for vehicle detection |
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| CN104539240A true CN104539240A (en) | 2015-04-22 |
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| CN201410651590.4A Pending CN104539240A (en) | 2014-11-17 | 2014-11-17 | Coupled oscillatory circuit with leakage protection function for vehicle detection |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258299Y (en) * | 1996-05-24 | 1997-07-23 | 上海发事达信息科技发展公司 | Vehicle detector |
| CN1263623A (en) * | 1998-04-08 | 2000-08-16 | 株式会社建伍 | Vehicle detection system with transponder |
| CN1604148A (en) * | 2004-11-15 | 2005-04-06 | 天津大学 | Rechargeable vehicle detection sensor |
| CN204190703U (en) * | 2014-11-17 | 2015-03-04 | 成都和音科技有限公司 | The coupled oscillatory circuit with leakage protection of vehicle detection |
-
2014
- 2014-11-17 CN CN201410651590.4A patent/CN104539240A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258299Y (en) * | 1996-05-24 | 1997-07-23 | 上海发事达信息科技发展公司 | Vehicle detector |
| CN1263623A (en) * | 1998-04-08 | 2000-08-16 | 株式会社建伍 | Vehicle detection system with transponder |
| CN1604148A (en) * | 2004-11-15 | 2005-04-06 | 天津大学 | Rechargeable vehicle detection sensor |
| CN204190703U (en) * | 2014-11-17 | 2015-03-04 | 成都和音科技有限公司 | The coupled oscillatory circuit with leakage protection of vehicle detection |
Non-Patent Citations (1)
| Title |
|---|
| 臧利林 等: "基于环形线圈车辆检测系统的研究与设计", 《仪器仪表学报》 * |
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Application publication date: 20150422 |
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