CN219302491U - Rotation speed sensor circuit - Google Patents
Rotation speed sensor circuit Download PDFInfo
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- CN219302491U CN219302491U CN202320402484.7U CN202320402484U CN219302491U CN 219302491 U CN219302491 U CN 219302491U CN 202320402484 U CN202320402484 U CN 202320402484U CN 219302491 U CN219302491 U CN 219302491U
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Abstract
The utility model discloses a rotation speed sensor circuit. The rotating speed sensor circuit is provided with a circuit input end, a circuit output end and a circuit common end, and also comprises an induction element, a conversion circuit and a sampling resistor; the conversion circuit comprises a voltage stabilizing tube, a first capacitor, a sampling resistor, a first voltage dividing resistor, a second voltage dividing resistor, a comparator and a pull-up resistor, wherein the sensing element is electrically connected with the input end of the circuit, the sensing element is electrically connected with the sampling resistor and the collector electrode of the comparator, the output end of the voltage stabilizing tube is electrically connected with the first capacitor and the first voltage dividing resistor, the grounding end of the voltage stabilizing tube is electrically connected with the common end of the circuit, the first voltage dividing resistor is electrically connected with the base electrode of the comparator and one end of the second voltage dividing resistor, the second voltage dividing resistor is electrically connected with the common end of the circuit, the emitter electrode of the comparator is electrically connected with the output end of the circuit, one end of the pull-up resistor is electrically connected with the input end of the circuit, and the other end of the pull-up resistor is electrically connected with the output end of the comparator. The circuit of the rotating speed sensor has high precision and long detection distance.
Description
Technical Field
The utility model relates to the technical field of rotating speed sensor circuits, in particular to a rotating speed sensor circuit.
Background
The current engine speed sensors in the market all adopt three-wire Hall output voltage signals, the rise time of high-level voltage is between 20 and 30 mu s, the high-precision engine speed detection is not facilitated, and the acquisition and judgment accuracy of engine speed signals are affected; although the high-level voltage rise time can be reduced by adopting a foreign high-precision three-wire Hall chip, the cost is high, and the product market popularization is not facilitated.
Disclosure of Invention
The utility model aims to provide a high-precision rotation speed sensor circuit.
In order to solve the problems, the utility model provides a rotating speed sensor circuit, which is provided with a circuit input end, a circuit output end and a circuit common end, and further comprises an induction element for inducing rotating speed, a conversion circuit for converting an electric signal of the induction element and a sampling resistor for sampling the conversion circuit, wherein the induction element is provided with an input end and an output end; the switching circuit comprises a voltage stabilizing tube, a first capacitor, a sampling resistor, a first voltage dividing resistor, a second voltage dividing resistor, a comparator and a pull-up resistor, wherein an input end of the sensing element is electrically connected with an input end of the circuit, an output end of the sensing element is electrically connected with a sampling resistor and a collector electrode of the comparator at the same time, an output end of the voltage stabilizing tube is electrically connected with one end of the first capacitor and one end of the first voltage dividing resistor at the same time, the grounding end of the voltage stabilizing tube is electrically connected with a common end of the circuit at the same time, the other end of the first voltage dividing resistor is electrically connected with a base electrode of the comparator and one end of the second voltage dividing resistor, the other end of the second voltage dividing resistor is electrically connected with the common end of the circuit, an emitter of the comparator is electrically connected with an output end of the circuit, one end of the pull-up resistor is electrically connected with the output end of the comparator.
Further, the anti-reverse connection device further comprises an anti-reverse connection element, wherein the input end of the anti-reverse connection element is electrically connected with the input end of the circuit, and the output end of the anti-reverse connection element is electrically connected with the input end of the sensing element and one end of the pull-up resistor.
Further, the reverse connection preventing element is a diode.
Further, the sensing element is a two-wire hall chip.
Further, the circuit also comprises a filter circuit for filtering electric waves, one end of the filter circuit is electrically connected with the input end of the circuit, and the other end of the filter circuit is electrically connected with the common end of the circuit.
Further, the filter circuit comprises two capacitors, and the two capacitors are connected in parallel.
The rotating speed sensor circuit provided by the utility model utilizes the voltage stabilizing tube, the first voltage dividing resistor and the second voltage dividing resistor to provide reference voltage for the comparator, the comparator recognizes the high-low level signals output by the sensing element through the sampling resistor, and the comparator outputs the high-low level signals as the rotating speed according to the electric high-low level signals of the base electrode and the collector electrode respectively, so that the rising time of the high level is reduced to be within 2 mu s, and the detection distance is increased to 0.5-2.5 mm.
Drawings
Fig. 1 is a schematic diagram of a preferred embodiment of a rotation speed sensor circuit according to the present utility model.
The meaning of the reference numerals in the drawings are:
the circuit input end Vcc, the circuit output end Vout, the circuit public end GND, the conversion circuit 1, the voltage stabilizing tube U2, the third capacitor C3, the first voltage dividing resistor R2, the second voltage dividing resistor R3, the pull-up resistor R4, the comparator U3, the filter circuit 2, the first capacitor C1, the second capacitor C2, the sensing element U1, the anti-reverse connection element D1 and the sampling resistor R1.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in fig. 1, a preferred embodiment of the rotation speed sensor circuit of the present utility model has a circuit input terminal Vcc, a circuit output terminal Vout, a circuit common terminal GND, and further includes a conversion circuit 1, a filter circuit 2, a sensing element U1, and an anti-reverse connection element D1. The input end of the anti-reverse connection element D1 is electrically connected with the circuit input end Vcc, the input ends of the conversion circuit 1, the filter circuit 2 and the sensing element U1 are electrically connected with the output end of the anti-reverse connection element D1, the anti-reverse connection element D1 can prevent reverse connection to an external circuit, the anti-reverse connection element D1 is a diode, and the cost is reduced. The output end of the sensing element U1 is electrically connected with the conversion circuit 1 and one end of the sampling resistor R1 at the same time, and the other end of the sampling resistor R1 is electrically connected with the circuit common end GND; the sensing element U1 is a two-wire Hall chip, so that the cost can be reduced; the sampling resistor R1 is used for sampling the conversion circuit 1. The filter circuit 2 is electrically connected with the circuit common terminal GND and the conversion circuit 1, and the filter circuit 2 is used for filtering circuit noise waves and outputting a current signal to the conversion circuit 1 better. The conversion circuit 1 is electrically connected with the circuit output end Vout and the circuit public end GND, the conversion circuit 1 converts current output of the induction element U1 into voltage output, and simultaneously converts single-end output of the induction element U1 into double-end output so as to adapt to a three-pin plug-in interface with a conventional market, and the conversion circuit 1 is grounded. In other embodiments, the anti-reverse connection element D1 may be replaced by an anti-reverse connection circuit.
The filter circuit 2 comprises a first capacitor C1 and a second capacitor C2, the first capacitor C1 and the second capacitor C2 are connected in parallel, one ends of the first capacitor C1 and the second capacitor C2 are electrically connected with the output end of the anti-reverse connection element D1, and the other ends of the first capacitor C1 and the second capacitor C2 are electrically connected with the circuit public end GND. The first capacitor C1 and the second capacitor C2 are connected in parallel to improve the filtering effect. In other embodiments, filtering may also be implemented using only one capacitor.
The conversion circuit 1 comprises a voltage stabilizing tube U2, a third capacitor C3, a first voltage dividing resistor R2, a second voltage dividing resistor R3, a pull-up resistor R4 and a comparator U3, wherein the input end of the voltage stabilizing tube U2 is electrically connected with the output end of the anti-reverse connection element D1, the output end of the voltage stabilizing tube U2 is electrically connected with the third capacitor C3 and one end of the first voltage dividing resistor R2, the grounding end of the voltage stabilizing tube U2 is grounded and is electrically connected with a circuit public end GND, and the voltage stabilizing tube U2 is used for providing a stable voltage reference signal for the comparator U3. The other end of the first voltage dividing resistor R2 is electrically connected with the base electrode of the comparator U3 and one end of the second voltage dividing resistor R3, the other end of the second voltage dividing resistor R3 is electrically connected with the circuit public end GND, and the first voltage dividing resistor R2 and the second voltage dividing resistor R3 provide set basic voltage signals for the base electrode of the comparator U3; the output end of the sensing element U1 is electrically connected with the collector of the comparator U3, the emitter of the comparator U3 is electrically connected with the circuit output end Vout, one end of the pull-up resistor R4 is electrically connected with the output end of the anti-reverse-connection element D1, the other end of the pull-up resistor R4 is electrically connected with the output end of the comparator U3, and the pull-up resistor R4 is used for pulling up the output voltage of the comparator U3. The voltage stabilizing tube U2, the first voltage dividing resistor R2 and the second voltage dividing resistor are adopted to provide reference voltage for the comparator U3, the comparator U3 recognizes high-low level signals output by the Hall chip through the sampling resistor R1, and the comparator U3 outputs the high-low level signals as high-low level output of rotating speed according to the electric high-low level signals of the base electrode and the collector electrode respectively.
The mature two-wire Hall chip is adopted for outputting current signals, and the current signals are converted into voltage signals so as to meet the conventional signal transmission in the market, and other matched equipment is not required to be changed. Two-wire Hall and a conversion circuit 1 are used for matching; the rise time of the high level can be reduced to within 2 mu s, compared with the rise time of the high level of the traditional three-wire Hall by 20-30 mu s, the rise time of the high level signal is long, and the rise time of the high level is greatly reduced; the distance between the vehicle and the vehicle can be increased, the detection distance is increased to 0.5mm-2.5mm, and compared with the existing detection distance of 0.5mm-1.5mm, the speed requirement on the installation position of the rotating speed sensor is reduced. The current type two-wire Hall chip in China at present has mature technology, mature manufacturing process and low cost, and can greatly reduce the risk that the rotating speed sensor is limited by foreign limitation when being applied to the rotating speed sensor. The two-wire Hall current type signal output is converted into three-wire voltage type signal output which is common in the market at present by adopting a circuit, and the butting application of the market rotation speed sensor is not affected.
The foregoing is only the embodiments of the present utility model, and therefore, the patent scope of the utility model is not limited thereto, and all equivalent structures made by the description of the utility model and the accompanying drawings are directly or indirectly applied to other related technical fields, which are all within the scope of the utility model.
Claims (6)
1. A rotational speed sensor circuit, characterized by: the circuit comprises a circuit input end, a circuit output end and a circuit common end, and further comprises an induction element for inducing the rotating speed, a conversion circuit for converting the electric signal of the induction element and a sampling resistor for sampling the conversion circuit, wherein the induction element is provided with an input end and an output end; the switching circuit comprises a voltage stabilizing tube, a first capacitor, a sampling resistor, a first voltage dividing resistor, a second voltage dividing resistor, a comparator and a pull-up resistor, wherein an input end of the sensing element is electrically connected with an input end of the circuit, an output end of the sensing element is electrically connected with a sampling resistor and a collector electrode of the comparator at the same time, an output end of the voltage stabilizing tube is electrically connected with one end of the first capacitor and one end of the first voltage dividing resistor at the same time, the grounding end of the voltage stabilizing tube is electrically connected with a common end of the circuit at the same time, the other end of the first voltage dividing resistor is electrically connected with a base electrode of the comparator and one end of the second voltage dividing resistor, the other end of the second voltage dividing resistor is electrically connected with the common end of the circuit, an emitter of the comparator is electrically connected with an output end of the circuit, one end of the pull-up resistor is electrically connected with the output end of the comparator.
2. The rotational speed sensor circuit of claim 1, wherein: the anti-reverse-connection device is characterized by further comprising an anti-reverse-connection element, wherein the input end of the anti-reverse-connection element is electrically connected with the input end of the circuit, and the output end of the anti-reverse-connection element is electrically connected with the input end of the sensing element and one end of the pull-up resistor.
3. The rotational speed sensor circuit of claim 2, wherein: the reverse connection preventing element is a diode.
4. The rotational speed sensor circuit of claim 1, wherein: the sensing element is a two-wire Hall chip.
5. The rotational speed sensor circuit of claim 1, wherein: the circuit also comprises a filter circuit for filtering electric waves, one end of the filter circuit is electrically connected with the input end of the circuit, and the other end of the filter circuit is electrically connected with the common end of the circuit.
6. The rotational speed sensor circuit of claim 5, wherein: the filter circuit comprises two capacitors, and the two capacitors are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320402484.7U CN219302491U (en) | 2023-03-06 | 2023-03-06 | Rotation speed sensor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320402484.7U CN219302491U (en) | 2023-03-06 | 2023-03-06 | Rotation speed sensor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219302491U true CN219302491U (en) | 2023-07-04 |
Family
ID=86985241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320402484.7U Active CN219302491U (en) | 2023-03-06 | 2023-03-06 | Rotation speed sensor circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219302491U (en) |
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2023
- 2023-03-06 CN CN202320402484.7U patent/CN219302491U/en active Active
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