CN214225210U - Detection circuit based on Hall element - Google Patents
Detection circuit based on Hall element Download PDFInfo
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- CN214225210U CN214225210U CN202120459048.4U CN202120459048U CN214225210U CN 214225210 U CN214225210 U CN 214225210U CN 202120459048 U CN202120459048 U CN 202120459048U CN 214225210 U CN214225210 U CN 214225210U
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Abstract
The utility model discloses a detection circuitry based on hall element, including hall element U1, amplifier U2, resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, hall element U1's second, the fourth port is connected with amplifier U2's signal input part, resistance R1's one end is connected with hall element U1's first port, electric capacity C1's one end is connected with hall element U1's fourth port, the other end is connected with amplifier U2's second pin, electric capacity C2's one end is connected with hall element U1's second port, the other end is connected with amplifier U2's third pin, resistance R2's one end is connected with the common junction between electric capacity C1 and the amplifier U2, the other end is connected with amplifier U2's fourth pin, resistance R3 with resistance R2 parallel connection; the alternating frequency of the variable magnetic field is detected by the Hall element U1, a corresponding square wave signal is output, the detected square wave signal is amplified by the amplifier U2 and then input into the MCU, and the liquid flow value is calculated.
Description
Technical Field
The utility model relates to a hall circuit's technical field specifically is a detection circuitry based on hall element.
Background
At present, in the field of detecting a variable magnetic field, a Hall sensor (Hall IC) is usually used for detecting the rotating speed of a magnet rotor, and when water pushes the magnet rotor to rotate, the Hall sensor senses that the magnet rotates and outputs a square wave signal. The MCU can calculate the square wave frequency to calculate the flow rate of the water flow.
Because the field has a complex electromagnetic environment, the requirement on the anti-interference capability of the Hall sensor is higher, and the requirement on the sensitivity of the Hall sensor is also higher, the Hall sensor of the international brand is mainly adopted in the industry to detect at present, and the cost is higher.
Disclosure of Invention
In view of the above, there is a need for a hall element based detection circuit that is inexpensive and easy to install.
A detection circuit based on a Hall element comprises a Hall element U1, an amplifier U2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2, wherein the second and fourth ports of the Hall element U1 are connected with a signal input end of an amplifier U2, one end of a resistor R1 is connected with the first port of the Hall element U1, one end of a capacitor C1 is connected with the fourth port of the Hall element U1, the other end of the capacitor C1 is connected with the second pin of an amplifier U2, one end of a capacitor C2 is connected with the second port of the Hall element U1, the other end of the capacitor C2 is connected with the third pin of an amplifier U2, one end of the resistor R2 is connected with the common connection point between the capacitor C1 and the amplifier U2, the other end of the resistor R3 is connected with the resistor R2 in parallel.
In one embodiment, the amplifier U2 has a chip model LM 358.
In one embodiment, the Hall element U1 is a Hall element.
In the detection circuit based on the Hall element, the Hall element (Hall element) circuit is adopted to replace the original Hall sensor scheme (Hall IC), the alternating frequency of the variable magnetic field is detected through the Hall element U1, so that when the N-S pole of the magnet is alternatively changed above the Hall circuit, the corresponding square wave signal is output, the frequency of the square wave signal corresponds to the alternating frequency of the N-S pole, the detected square wave signal is amplified by the amplifier U2 and then is input into the MCU, the liquid flow value can be calculated through the MCU, and the detection circuit is simple and convenient, has higher sensitivity, effectively reduces the cost, and can be suitable for occasions with weaker magnetic field; the resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 form a high-pass filter circuit, and the influence of zero drift of an output signal of the Hall element U1 in the circuit is eliminated.
Drawings
Fig. 1 is a circuit diagram of a detection circuit based on a hall element according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a detection circuit based on a hall element includes a hall element U1, an amplifier U2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2, wherein the second and fourth ports of the hall element U1 are connected to a signal input terminal of the amplifier U2, one end of the resistor R1 is connected to a first port of the hall element U1, one end of the capacitor C1 is connected to a fourth port of the hall element U1, the other end is connected to a second pin of the amplifier U2, one end of the capacitor C2 is connected to a second port of the hall element U1, the other end is connected to a third pin of the amplifier U2, one end of the resistor R2 is connected to a common connection point between the capacitor C1 and the amplifier U2, the other end is connected to a fourth pin of the amplifier U2, and the resistor R3 is connected to the resistor R2 in parallel.
Vcc is external power supply, R1 is voltage divider for limiting the voltage/current supplied to Hall element U1, and the resistance of adjusting resistor R1 can be adapted to different Vcc values, such as 5V/12V/24V, etc. The Hall element U1 is a device for outputting differential signals after sensing the change of an external magnetic field, and the amplifier U2 is used for amplifying the output signals of the Hall element U1 and can convert weak sine wave signals into square wave signals. The capacitor C1 and the capacitor C2 can filter useless direct current signals, the zero drift influence of output signals of the Hall element U1 can be eliminated, and the duty ratio of output square waves is close to 50%. The resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 form a high-pass filter circuit.
The alternating frequency of the variable magnetic field is detected by the Hall element U1, so that when the N-S poles of the magnet are alternatively changed above the Hall circuit, corresponding square wave signals are output, the frequency of the square wave signals corresponds to the alternating frequency of the N-S poles, the detected square wave signals are amplified by the amplifier U2 and then input into the MCU, and the liquid flow value can be calculated by the MCU.
Therefore, based on the detection circuit of the Hall element, the Hall element (Hall element) circuit is adopted to replace the original Hall sensor scheme (Hall IC), the alternating frequency of the variable magnetic field is detected through the Hall element U1, when the N-S pole of the magnet is alternatively changed above the Hall circuit, the corresponding square wave signal is output, the frequency of the square wave signal corresponds to the alternating frequency of the N-S pole, the detected square wave signal is amplified by the amplifier U2 and then is input into the MCU, the liquid flow value can be calculated through the MCU, the detection circuit is simple and convenient, has higher sensitivity, effectively reduces the cost, and can be suitable for occasions with weaker magnetic field; the resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 form a high-pass filter circuit, and the influence of zero drift of an output signal of the Hall element U1 in the circuit is eliminated. No detection is made for static magnetic fields or for non-magnetic environments.
In one embodiment, the amplifier U2 has a chip model LM 358.
The amplifier U2 has the characteristics of low power consumption and strong universality, and effectively saves the cost.
In one embodiment, the Hall element U1 is a Hall element.
Hall element U1, Hall element (hall element), this circuit have utilized hall element (hall element) low voltage (about 1V) operating characteristic, are different from ordinary Hall IC, have avoided the operating voltage of ordinary Hall IC to require the characteristics high (> 1.5V).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. A detection circuit based on a hall element, characterized in that: the Hall element U1, the amplifier U2, the resistor R1, the resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 are included, the second port and the fourth port of the Hall element U1 are connected with the signal input end of the amplifier U2, one end of the resistor R1 is connected with the first port of the Hall element U1, one end of the capacitor C1 is connected with the fourth port of the Hall element U1, the other end of the capacitor C1 is connected with the second pin of the amplifier U2, one end of the capacitor C2 is connected with the second port of the Hall element U1, the other end of the capacitor C2 is connected with the third pin of the amplifier U2, one end of the resistor R2 is connected with the common connection point between the capacitor C1 and the amplifier U2, the other end of the resistor R358294 is connected with the fourth pin of the amplifier U2, and the resistor R3 is connected with the resistor R2 in parallel.
2. The hall element-based detection circuit of claim 1, wherein: the amplifier U2 has a chip model LM 358.
3. The hall element-based detection circuit of claim 1, wherein: the Hall element U1 is a Hall element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120459048.4U CN214225210U (en) | 2021-03-03 | 2021-03-03 | Detection circuit based on Hall element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120459048.4U CN214225210U (en) | 2021-03-03 | 2021-03-03 | Detection circuit based on Hall element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214225210U true CN214225210U (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202120459048.4U Active CN214225210U (en) | 2021-03-03 | 2021-03-03 | Detection circuit based on Hall element |
Country Status (1)
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| CN (1) | CN214225210U (en) |
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2021
- 2021-03-03 CN CN202120459048.4U patent/CN214225210U/en active Active
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