CN207067165U - Tach signal sampling processing circuit - Google Patents
Tach signal sampling processing circuit Download PDFInfo
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- CN207067165U CN207067165U CN201720786640.9U CN201720786640U CN207067165U CN 207067165 U CN207067165 U CN 207067165U CN 201720786640 U CN201720786640 U CN 201720786640U CN 207067165 U CN207067165 U CN 207067165U
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- triode
- processing circuit
- sampling processing
- signal sampling
- tach signal
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Abstract
It the utility model is related to tach signal sampling processing circuit, including tie point and the second branch road；The tie point includes the triode and clamp resistance of series connection, second branch road includes being used to access the interface of current type speed probe and for connecting the triode, providing the biasing resistor of bias voltage for the triode, interface and the biasing resistor series connection；Series connection point between the triode and clamp resistance connects the output end of the tach signal sampling processing circuit, and the output end is used to connect a single-chip microcomputer for detecting the output end signal frequency.The current-mode analog quantity that speed probe exports is eventually converted into low and high level signal by circuit of the present utility model, is sampled for single-chip microcomputer, is realized the measurement of rotating speed.
Description
Technical field
It the utility model is related to a kind of tach signal sampling processing circuit.
Background technology
Current type speed probe, current signal can be converted into voltage signal and be acquired by series resistance.Such as
Current sensor detection circuit shown in Fig. 1, includes current type speed probe SENSOR, series connection RL=100 Ω resistance, leads to
Tach signal can be obtained by crossing detection RL both end voltages, realize the detection of rotating speed.
But due to the relation of actual speed, usual RL both end voltages excursion is smaller, and tach signal excursion is small,
Single-chip microcomputer can not be detected directly, and the processing to follow-up rotating speed causes larger trouble.
Utility model content
The purpose of this utility model is to provide a kind of tach signal sampling processing circuit, can not lead to solve available circuit
Cross the problem of single-chip microcomputer directly detects.
To achieve the above object, scheme of the present utility model includes：
Tach signal sampling processing circuit, including tie point and the second branch road；The tie point includes the three of series connection
Pole pipe and clamp resistance, the second branch road include being used to access the interface of current type speed probe and for connecting three pole
Pipe, the biasing resistor for providing for the triode bias voltage, the interface and biasing resistor are connected；The triode and clamper
Series connection point between resistance connects the output end of the tach signal sampling processing circuit, and the output end is used for one detection of connection should
The single-chip microcomputer of output end signal frequency.
The triode is PNP triode, and the clamp resistance is pull down resistor；The emitter-base bandgap grading of the PNP triode is used to connect
Power supply is connect, colelctor electrode connects through the pull down resistor ground connection.
Also be in series with divider resistance in second branch road, the biasing resistor, the divider resistance and the interface from
High potential is sequentially connected in series to low-voltage；The base stage of the PNP triode is connected between the biasing resistor and divider resistance.
The power supply connects the tie point and the second branch road by a diode.
Circuit of the present utility model, by the selection of biasing resistor, it can be made to match with speed probe output current
Close, realize：Different speed probe output currents, pass through the change of triode state, the voltage status of reflection to output end
Difference, so as to which less speed probe output signal to be converted into the level signal of height change.That is, it is speed probe is defeated
The current-mode analog quantity gone out is eventually converted into low and high level signal, is sampled for single-chip microcomputer, realizes the measurement of rotating speed.
Brief description of the drawings
Fig. 1 is a kind of detection circuit of current type speed probe；
Fig. 2 is rotating speed sampling processing electric current of the present utility model.
Embodiment
The utility model is described in more detail below in conjunction with the accompanying drawings.
Circuit of the present utility model is as shown in Fig. 2 including diode D1, resistance R1, R2, R3, PNP triode Q1, monolithic
Machine U1, current type speed probe S1 etc..
Wherein, triode Q1 and pull down resistor R3 forms tie point, and triode Q1 emitter-base bandgap grading connects diode D1 negative electrode,
Diode D1 anodes connection power supply VCC；Triode Q1 colelctor electrode connects pull down resistor R3, pull down resistor R3 other ends ground connection.Q1
Colelctor electrode output PULSE signal meet single-chip microcomputer U1.
R1 is Q1 biasing resistor, and it is divider resistance to connect Q1 base stages and emitter-base bandgap grading, R2, i.e. base stage connection R1, R2's of Q1
Junction.R1, R2 and rotating speed speed probe S1 series connection, form the second branch road, R1 connection diode D1 negative electrodes, and S1 is grounded, from
And make the second branch road in parallel with shown tie point.
Sampling processing circuit operation principle of the present utility model is as follows：When part operates, the electric current of speed probe is with portion
Part state changes, and speed probe output includes two current values, a high current, a low current；Two electric currents are handed over
For appearance, alternate frequency just represents the speed of rotating speed.
When electric current replaces, the voltage on resistance R1, R2 changes therewith, regulation resistance R1 resistance, its point when making low current
Pressure is less than 0.7V, and partial pressure is more than 0.7V during high current.When the upper partial pressures of R1 are less than 0.7V, triode Q1 ends, and signal PULSE is electric
Resistance R3 is dragged down；When the upper partial pressures of R1 are more than 0.7V, triode Q1 conductings, PULSE signal is height.The circuit is by speed probe
Current signal is converted to the level signal of height change, is detected for single-chip microcomputer U1, and the frequency that single-chip microcomputer U1 collects PULSE is got over
Height, then illustrate that rotating speed is faster, so as to realize tachometric survey according to PULSE frequency.
If the circuit misconnection power supply, diode D1 prevents electric current from pouring in down a chimney to detection circuit, while triode ends, resistance
R1, single-chip microcomputer U1 are protected；And the upper maximum voltage of resistance R1, R2 is VCC, external voltage is not subject to, resistance type selecting is held
Easily.
The embodiment that the utility model is related to is presented above, but the utility model is not limited to described reality
Apply mode.Under the thinking that the utility model provides, those skilled in the art are readily apparent that to the technology hand in above-described embodiment
Section enter line translation, replacement, modification, but play a part of and the utility model in relevant art means it is essentially identical, realize
Purpose of utility model is also essentially identical.Such as：
If not considering protective effect, access diode D1 can not had to.
For another example, pull down resistor can also replace with pull-up resistor.And for example, triode replaces with NPN and (accordingly changes biased electrical
The connection of resistance).And for example, divider resistance R2 therein is saved.The technical scheme so formed is that above-described embodiment is finely adjusted
Formed, this technical scheme is still fallen within the scope of protection of the utility model.
Claims (4)
1. tach signal sampling processing circuit, it is characterised in that including tie point and the second branch road；The tie point includes
The triode and clamp resistance of series connection, the second branch road include being used to access the interface of current type speed probe and for connecting
State triode, the biasing resistor of bias voltage is provided for the triode, interface and the biasing resistor series connection；The triode
Series connection point between clamp resistance is connected the output end of the tach signal sampling processing circuit, and the output end is used to connect one
Detect the single-chip microcomputer of the output end signal frequency.
2. tach signal sampling processing circuit according to claim 1, it is characterised in that the triode is the poles of PNP tri-
Pipe, the clamp resistance is pull down resistor；The emitter-base bandgap grading of the PNP triode is used to connect power supply, colelctor electrode connect through it is described under
Pull-up resistor is grounded.
3. tach signal sampling processing circuit according to claim 2, it is characterised in that also connected in second branch road
There is divider resistance, the biasing resistor, the divider resistance and the interface are sequentially connected in series from high potential to low-voltage；It is described
The base stage of PNP triode is connected between the biasing resistor and divider resistance.
4. the tach signal sampling processing circuit according to Claims 2 or 3, it is characterised in that the power supply passes through one
Diode connects the tie point and the second branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720786640.9U CN207067165U (en) | 2017-06-30 | 2017-06-30 | Tach signal sampling processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720786640.9U CN207067165U (en) | 2017-06-30 | 2017-06-30 | Tach signal sampling processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207067165U true CN207067165U (en) | 2018-03-02 |
Family
ID=61507665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720786640.9U Active CN207067165U (en) | 2017-06-30 | 2017-06-30 | Tach signal sampling processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207067165U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212252A (en) * | 2017-06-30 | 2019-01-15 | 郑州宇通客车股份有限公司 | A kind of tach signal sampling processing circuit |
-
2017
- 2017-06-30 CN CN201720786640.9U patent/CN207067165U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212252A (en) * | 2017-06-30 | 2019-01-15 | 郑州宇通客车股份有限公司 | A kind of tach signal sampling processing circuit |
| CN109212252B (en) * | 2017-06-30 | 2024-04-19 | 宇通客车股份有限公司 | Rotational speed signal sampling processing circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
|
| CP03 | Change of name, title or address |