CN204255966U - For the modulate circuit of vehicle speed pulse - Google Patents
For the modulate circuit of vehicle speed pulse Download PDFInfo
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- CN204255966U CN204255966U CN201420695215.5U CN201420695215U CN204255966U CN 204255966 U CN204255966 U CN 204255966U CN 201420695215 U CN201420695215 U CN 201420695215U CN 204255966 U CN204255966 U CN 204255966U
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- resistance
- triode
- electric capacity
- vehicle speed
- speed pulse
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Abstract
The utility model discloses the modulate circuit for vehicle speed pulse, comprise resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, triode T, trigger Q and voltage stabilizing diode D, the basis set of described resistance R1, electric capacity C2, triode T connects successively, and wherein resistance R1 also connects vehicle speed pulse; The grounded emitter of described triode T, contact resistance R2 is gone back between the basis set and emitter of triode T, electric capacity C1 is also connected between the common port and the emitter of triode T of resistance R1 and electric capacity C2, voltage stabilizing diode D is connected in parallel on the two ends of electric capacity C1, goes back contact resistance R3 between the collector of triode T and power Vcc; Described trigger Q is connected between the collector of resistance R4 and triode T, and resistance R4 also connects output signal end.The utility model, by above-mentioned principle, avoids other signal disturbing, and shaping stable output vehicle speed pulse accurately, the speed information of reflection is more accurate.
Description
Technical field
The utility model relates to automobile instrument field, is specifically related to the modulate circuit for vehicle speed pulse.
Background technology
Automobile instrument is the information interchange interface of driver and automobile, has vital role to automotive safety and economy run.In recent years, along with the development of automotive electronic technology, automobile instrument display information also constantly increases, and traditional mechanical pointer automobile combination meter then cannot meet present user demand.Particularly computing machine, microelectronics and various field bus communication technology are extensively used, and take embedded microprocessor as the inexorable trend that the Intelligentized digital motor instrument of core will be automobile instrument development.And need to gather vehicle speed pulse in embedded design, because automobile works in the presence of a harsh environment mostly, speed of a motor vehicle sensor signal will be disturbed, and cause the final speed information gathered inaccurate, be unfavorable for that the later stage uses.
Utility model content
The utility model overcomes the deficiencies in the prior art, is provided for the modulate circuit of vehicle speed pulse, avoids other signal disturbing, and shaping stable output vehicle speed pulse accurately, the speed information of reflection is more accurate.
For solving above-mentioned technical matters, the utility model is by the following technical solutions: for the modulate circuit of vehicle speed pulse, comprise resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, triode T, trigger Q and voltage stabilizing diode D, the basis set of described resistance R1, electric capacity C2, triode T connects successively, and wherein resistance R1 also connects vehicle speed pulse; The grounded emitter of described triode T, contact resistance R2 is gone back between the basis set and emitter of triode T, electric capacity C1 is also connected between the common port and the emitter of triode T of resistance R1 and electric capacity C2, voltage stabilizing diode D is connected in parallel on the two ends of electric capacity C1, goes back contact resistance R3 between the collector of triode T and power Vcc; Described trigger Q is connected between the collector of resistance R4 and triode T, and resistance R4 also connects output signal end.
The low-pass filter circuit first formed through resistance R1 and electric capacity C1 for the vehicle speed pulse collected carries out first time filtering, and then by the high-pass filtering circuit that electric capacity C2 and resistance R2 form to carry out after second time filtering again by Signal transmissions to the basis set of triode T, and triode T is in the circuit as amplifier, collector current is by the control of base current, and the change that base current is very little, can cause the change that collector current is very large.When the vehicle speed pulse of change is added to base stage with between emitter, this will cause the change of base current Ib, after the change of Ib is exaggerated, result in the change that Ic is very large.And after collector first flows through trigger Q process, flow through a resistance R4 again, can calculate according to voltage computing formula U=R*I, on this resistance, voltage will change a lot, and this resistance is exactly the voltage signal after amplifying, then the voltage signal after this amplification is exported through signal output part.The vehicle speed pulse exported after treatment is not subject to other signal disturbing, and output pulse signal is steady and audible, and the speed information reflected is more accurate.
Described trigger Q is this schmitt trigger.Shaping pulse can better be realized, the vehicle speed pulse of stable output.
Pull down resistor R5 is also connected between described resistance R4 and the common port of signal output part.This resistance and resistance R4 acting in conjunction provide a fixed level to circuit.
The size of described resistance R2 resistance is 10 times of resistance R3 resistance size.Reach best amplification effect.
Described electric capacity C1 size and electric capacity C2 equal and opposite in direction.Reach better filter effect.
Described resistance R4 size and resistance R5 equal and opposite in direction.
Compared with prior art, the beneficial effects of the utility model are:
1, first after the low-pass filter of RC composition carries out filtering, and then will carry out filtering again by the Hi-pass filter that CR forms for vehicle speed pulse, thus filter out most undesired signal, the vehicle speed pulse of transmission is more accurate.
2, triode T is also set in the circuit as amplifier, collector current is by the control of base current, and the change that base current is very little, the change that collector current is very large can be caused, thus the better amplification realized vehicle speed pulse, make the final vehicle speed pulse exported more clear.
3, trigger Q is this schmitt trigger.Shaping pulse can better be realized, the vehicle speed pulse of stable output.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Be further elaborated the utility model below in conjunction with accompanying drawing, embodiment of the present utility model is not limited thereto.
Embodiment 1:
As shown in Figure 1, the size that the utility model comprises resistance R1 is 27 kilo-ohms, the size of resistance R2 is 10 kilo-ohms, the size of resistance R3 is 10 kilo-ohms, the size of resistance R4 is 1.6 kilo-ohms, the size of electric capacity C1 is 1 microfarad, the size of electric capacity C2 is 1 microfarad, triode T, trigger Q and voltage stabilizing diode D, the basis set of described resistance R1, electric capacity C2, triode T connects successively, and wherein resistance R1 also connects vehicle speed pulse; The grounded emitter of described triode T, contact resistance R2 is gone back between the basis set and emitter of triode T, electric capacity C1 is also connected between the common port and the emitter of triode T of resistance R1 and electric capacity C2, voltage stabilizing diode D is connected in parallel on the two ends of electric capacity C1, goes back contact resistance R3 between the collector of triode T and power Vcc; Described trigger Q is connected between the collector of resistance R4 and triode T, and resistance R4 also connects output signal end.
The low-pass filter circuit first formed through resistance R1 and electric capacity C1 in the vehicle speed pulse collected carries out first time filtering, and then by the high-pass filtering circuit that electric capacity C2 and resistance R2 form to carry out after second time filtering again by Signal transmissions to the basis set of triode T, and triode T is in the circuit as amplifier, collector current is by the control of base current, and the change that base current is very little, can cause the change that collector current is very large.When the vehicle speed pulse of change is added to base stage with between emitter, this will cause the change of base current Ib, after the change of Ib is exaggerated, result in the change that Ic is very large.And after collector first flows through trigger Q process, flow through a resistance R4 again, can calculate according to voltage computing formula U=R*I, on this resistance, voltage will change a lot, and this resistance is exactly the voltage signal after amplifying, then the voltage signal after this amplification is exported through signal output part.The vehicle speed pulse exported after treatment is not subject to other signal disturbing, and output pulse signal is steady and audible, and the speed information reflected is more accurate.
Embodiment 2:
The present embodiment is preferably as follows on the basis of embodiment 1: described trigger Q is this schmitt trigger.
Pull down resistor R5 is also connected between described resistance R4 and the common port of signal output part.Shaping pulse can better be realized, the vehicle speed pulse of stable output.The size of R5 is 1.6 kilo-ohms.
The size of described resistance R2 resistance is 10 times of resistance R3 resistance size.
Described electric capacity C1 size and electric capacity C2 equal and opposite in direction.
Described resistance R4 size and resistance R5 equal and opposite in direction.
Just this utility model can be realized as mentioned above.
Claims (6)
1. for the modulate circuit of vehicle speed pulse, it is characterized in that: comprise resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, triode T, trigger Q and voltage stabilizing diode D, the basis set of described resistance R1, electric capacity C2, triode T connects successively, and wherein resistance R1 also connects vehicle speed pulse; The grounded emitter of described triode T, contact resistance R2 is gone back between the basis set and emitter of triode T, electric capacity C1 is also connected between the common port and the emitter of triode T of resistance R1 and electric capacity C2, voltage stabilizing diode D is connected in parallel on the two ends of electric capacity C1, goes back contact resistance R3 between the collector of triode T and power Vcc; Described trigger Q is connected between the collector of resistance R4 and triode T, and resistance R4 also connects output signal end.
2. the modulate circuit for vehicle speed pulse according to claim 1, is characterized in that: described trigger Q is this schmitt trigger.
3. the modulate circuit for vehicle speed pulse according to claim 1, is characterized in that: also connect pull down resistor R5 between described resistance R4 and the common port of signal output part.
4. the modulate circuit for vehicle speed pulse according to claim 1, is characterized in that: the size of described resistance R2 resistance is 10 times of resistance R3 resistance size.
5. the modulate circuit for vehicle speed pulse according to claim 1, is characterized in that: described electric capacity C1 size and electric capacity C2 equal and opposite in direction.
6. the modulate circuit for vehicle speed pulse according to claim 1, is characterized in that: described resistance R4 size and resistance R5 equal and opposite in direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420695215.5U CN204255966U (en) | 2014-11-19 | 2014-11-19 | For the modulate circuit of vehicle speed pulse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420695215.5U CN204255966U (en) | 2014-11-19 | 2014-11-19 | For the modulate circuit of vehicle speed pulse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204255966U true CN204255966U (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420695215.5U Expired - Fee Related CN204255966U (en) | 2014-11-19 | 2014-11-19 | For the modulate circuit of vehicle speed pulse |
Country Status (1)
| Country | Link |
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| CN (1) | CN204255966U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483503A (en) * | 2014-11-19 | 2015-04-01 | 成都嵌智捷科技有限公司 | Conditioning circuit capable of outputting stable vehicle speed pulse signal |
-
2014
- 2014-11-19 CN CN201420695215.5U patent/CN204255966U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483503A (en) * | 2014-11-19 | 2015-04-01 | 成都嵌智捷科技有限公司 | Conditioning circuit capable of outputting stable vehicle speed pulse signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20161119 |