CN209707534U - A kind of signals of rotational speed sensor processing circuit - Google Patents
A kind of signals of rotational speed sensor processing circuit Download PDFInfo
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- CN209707534U CN209707534U CN201920377708.7U CN201920377708U CN209707534U CN 209707534 U CN209707534 U CN 209707534U CN 201920377708 U CN201920377708 U CN 201920377708U CN 209707534 U CN209707534 U CN 209707534U
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Abstract
The utility model discloses a kind of signals of rotational speed sensor processing circuits, it included the first signal input part, second signal input terminal, square-wave signal output end, comparator, first resistor and second resistance, wherein: the comparator is integrated chip LM211, its 1 foot ground connection, signal ground pin of its 2 foot through the second signal sensor input connection, signal output pin of its 3 foot through first signal input part connection sensor, 4 feet connect a negative level, its 8 foot connects a positive level, its 7 foot and forms the square-wave signal output end.The first resistor R1 is connected between the second signal input terminal and 2 feet of the comparator.The second resistance R2 is connected between 7 feet of the comparator and 2 feet of the comparator, to provide a feedback trigger level to the comparator.Signals of rotational speed sensor processing circuit provided by the utility model, the original sine wave signal condition that can export sensor are stable positive and negative square-wave signal.
Description
Technical field
The utility model relates to sensor manufacturing fields, especially signals of rotational speed sensor processing circuit.
Background technique
The output signal of speed probe is influenced by factors such as installation gap, revolving speeds, at the scene in use, due to signal wave
Dynamic and scene interference, can generate signal burr, so that comparator wave distortion.Someone combines single-chip computer control system, passes through list
Piece machine A/D acquires the original signal of sensor output, and then determines and obtain comparator reference voltage, and then carries out to tach signal
Conditioning, but this method higher cost need to can be allowed using complicated SCM system, and when signal is stronger beyond comparator
Maximum input voltage, causes component damage, and reliability is not high.
Utility model content
In order to solve above-mentioned technical problem in the prior art, the utility model provides a kind of signals of rotational speed sensor
The initial sinusoids tach signal that speed probe exports can be transformed to stable positive and negative square-wave signal by processing circuit.Its skill
Art scheme is as follows:
A kind of signals of rotational speed sensor processing circuit, the sine wave signal conditioning for being used to generate speed probe are side
Wave signal comprising cross the first signal input part, second signal input terminal, square-wave signal output end, comparator, first resistor and
Second resistance, in which: the comparator is integrated chip LM211, and 1 foot is grounded, and 2 feet connect through the second signal input terminal
Connect the signal ground pin of sensor, signal output pin of 3 feet through first signal input part connection sensor, 4
Foot connects a negative level, its 8 foot connects a positive level, its 7 foot and forms the square-wave signal output end.The first resistor R1
It is connected between the second signal input terminal and 2 feet of the comparator.The second resistance R2 is connected on the comparator
7 feet and the comparator 2 feet between, thus to the comparator provide a feedback trigger level.
Further, the second signal input end grounding, first signal input part and second signal input
A filter capacitor is connected between end.
Further, clamp diode is connected between 2 feet and 3 feet of the comparator U1.
Compared with prior art, signals of rotational speed sensor processing circuit provided by the utility model, can be by sensor
The original sine wave signal condition of output is stable positive and negative square-wave signal.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of the utility model.
Specific embodiment
For make the utility model above objects, features, and advantages, can be more obvious and easy to understand, with reference to the accompanying drawing and tool
Body embodiment is described in further detail the utility model.
The utility model provides a kind of signals of rotational speed sensor processing circuit, can export speed probe original
Sine wave signal improves the negative square-wave signal that is positive.
As shown in Figure 1, in one embodiment, the signals of rotational speed sensor processing circuit is inputted including the first signal
Hold SIGN, second signal input terminal SIGN COM, square-wave signal output end Uo, comparator U1, first resistor R1 and second resistance
R2。
The comparator U1 is model LM211 integrated chip comprising have 8 pins, the definition of each pin and
The internal processing logic of the LM211 integrated chip is known described in persons skilled in the art, therefore this specification is no longer superfluous
It states.Specific in the present embodiment: its 1 foot ground connection, 2 feet are through the second signal input terminal SIGN COM connection sensor
Signal ground pin (signal ground), signal output pin of 3 feet through the first signal input part SIGN connection sensor,
4 feet connect a negative level-Vcc, its 8 foot connects a positive level Vcc, its 7 foot and forms the square-wave signal output end Uo.
The first resistor R1 be connected in the second signal input terminal SIGN COM and the comparator U1 2 feet it
Between.The second resistance R2 is connected between 7 feet of the comparator U1 and 2 feet of the comparator U1, to give the ratio
A benchmark comparative level Ur is provided compared with device U1.
Please continue to refer to shown in Fig. 1, the course of work of the signals of rotational speed sensor processing circuit approximately as:
When the sinusoidal signal inputted from the first signal input part SIGN is in decline process (from large to small): working as signal
When greater than Ur, it is about-Vcc that comparator U1, which exports Uo, at this time Ur=(- Vcc.R1)/R2.Until signal is decreased to less than (-
Vcc.R1)/R2, the jump of the side Uo are+Vcc, at this time Ur=(Vcc.R1)/R2.That is: when signal is decreased to by (- Vcc.R1)/R2
(Vcc.R1) during/R2, it is constant that comparator U1 output is maintained at previous state, exports a negative level-Vcc always.
When the sinusoidal signal inputted from the first signal input part SIGN is in uphill process (changing from small to big): working as signal
When less than Ur, it is about+Vcc that comparator U1, which exports Uo, at this time Ur=(Vcc.R1)/R2.It is greater than until signal increases to
(Vcc.R1)/R2 when, the jump of the side Uo is-Vcc, at this time Ur=(- Vcc.R1)/R2.That is: when signal is increased by (Vcc.R1)/R2
To (- Vcc.R1)/R2, comparator U1 output guarantees, holding output one positive level Vcc constant in previous state.
As it can be seen that the sine wave signal of signals of rotational speed sensor output, which is improved, to be positive under the adjusting of the comparator U1
Losing side wave, it may be assumed that the durations such as positive level Vcc and negative level-Vcc are alternately present.
Please continue to refer to shown in Fig. 1, in certain embodiments, the second signal input terminal SIGN COM is grounded,
Filter capacitor C1 is connected between the first signal input part SIGN and the second signal input terminal SIGN COM.Input letter
High frequency impurity in number is filtered out by the filter capacitor C1.
Further, clamp diode D1 and clamp diode D2 are connected between 2 feet and 3 feet of the comparator U1.
Input signal can be clamped to ± Vcc hereinafter, to prevent the comparator U1 from being burnt by clamp diode and clamp diode D2
It is bad.
The description with certain particularity detailed enough has been carried out to the utility model above.It is common in fields
It is to be understood by the skilled artisans that the description in embodiment is only exemplary, without departing from the utility model true spirit and
All changes are made under the premise of range all should belong to the protection scope of the utility model.The utility model is claimed
Range is to be defined by described claims, rather than limited by the foregoing description in embodiment.
Claims (3)
1. a kind of signals of rotational speed sensor processing circuit is used to improve the sine wave signal that speed probe exports for square wave
Signal, it is characterised in that: it included the first signal input part, second signal input terminal, square-wave signal output end, comparator,
First resistor and second resistance, in which:
The comparator is integrated chip LM211, and 1 foot ground connection, 2 feet are through the second signal sensor input connection
Signal ground pin, signal output pin of 3 feet through first signal input part connection sensor, the connection one of 4 feet are negative
Level, its 8 foot connect a positive level, its 7 foot and form the square-wave signal output end；
The first resistor R1 is connected between the second signal input terminal and 2 feet of the comparator；
The second resistance R2 is connected between 7 feet of the comparator and 2 feet of the comparator, to give the comparator
One feedback trigger level is provided.
2. signals of rotational speed sensor processing circuit as described in claim 1, it is characterised in that: the second signal input termination
Ground is connected with a filter capacitor between first signal input part and the second signal input terminal.
3. signals of rotational speed sensor processing circuit as described in claim 1, it is characterised in that: 2 feet and 3 of the comparator U1
Clamp diode is connected between foot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920377708.7U CN209707534U (en) | 2019-03-22 | 2019-03-22 | A kind of signals of rotational speed sensor processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920377708.7U CN209707534U (en) | 2019-03-22 | 2019-03-22 | A kind of signals of rotational speed sensor processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209707534U true CN209707534U (en) | 2019-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920377708.7U Active CN209707534U (en) | 2019-03-22 | 2019-03-22 | A kind of signals of rotational speed sensor processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209707534U (en) |
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2019
- 2019-03-22 CN CN201920377708.7U patent/CN209707534U/en active Active
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