CN212586447U - Detection circuit for magnetic particle current - Google Patents
Detection circuit for magnetic particle current Download PDFInfo
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- CN212586447U CN212586447U CN202021307449.XU CN202021307449U CN212586447U CN 212586447 U CN212586447 U CN 212586447U CN 202021307449 U CN202021307449 U CN 202021307449U CN 212586447 U CN212586447 U CN 212586447U
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Abstract
The utility model discloses a detection circuitry of magnetic particle current, including resistance R1, resistance R7, the voltage amplification unit, first filter unit, the second filter unit, the third filter unit, output unit is followed to voltage, resistance R1's signal output part is connected with first filter unit's signal input part, first filter unit's signal output part is connected with second filter unit's signal input part, second filter unit's signal output part is connected with voltage amplification unit's signal input part, voltage amplification unit's signal output part is connected with third filter unit's signal input part, third filter unit's signal output part is connected with voltage output unit's signal input part, voltage output unit's signal output part is connected with resistance R7's one end; above-mentioned detection circuitry, through resistance R1 collection to magnetic powder voltage signal and send the singlechip, the singlechip judges whether the current value belongs to normal scope and sends for tension control system, and the current value degree of accuracy that detects is high.
Description
Technical Field
The utility model relates to a technical field of current detection specifically is a detection circuitry of magnetic particle current.
Background
In a tension control system, the control on magnetic powder cannot be kept away, in a control system of magnetic powder on the market, current detection is carried out by using a chip special for current detection or only using a sampling resistor, the two detections have respective defects, the chip special for current detection is accurate in current detection, but expensive, only uses the sampling resistor for detection, and is cheap, but the detected current is inaccurate, and the output quantity of the magnetic powder cannot be accurately controlled by following the detected structure.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for a magnetic particle current detection circuit that is low in cost and high in detection accuracy.
The utility model provides a detection circuitry of magnetic particle current, includes that resistance R1, resistance R7, voltage amplification unit, first filter unit, second filter unit, third filter unit, voltage follow the output unit, resistance R1's signal output part with the signal input part of first filter unit is connected, the signal output part of first filter unit with the signal input part of second filter unit is connected, the signal output part of second filter unit with the signal input part of voltage amplification unit is connected, the signal output part of voltage amplification unit is connected with the signal input part of third filter unit, the signal output part of third filter unit with the signal input part of voltage follow the output unit is connected, and the signal output part of voltage follow the output unit is connected with the one end of resistance R7.
In one embodiment, the first filter unit comprises a resistor R2 and a capacitor C1, and the resistor R2 and the capacitor C1 are connected in series.
In one embodiment, the second filtering unit comprises a resistor R3 and a capacitor C2, and the resistor R3 and the capacitor C2 are connected in series.
In one embodiment, the voltage amplification unit includes a first operational amplifier U1B.
In one embodiment, the third filtering unit includes a resistor R6 and a capacitor C4, and the resistor R6 and the capacitor C4 are connected in series.
In one embodiment, the detection circuit further includes a resistor R8 and a capacitor C6, and the resistor R8 and the capacitor C6 are connected in parallel and are respectively connected to one end of the resistor R7.
In one embodiment, the detection circuit further comprises a diode D1, one end of the diode D1 is connected with the IO port of the single chip microcomputer, and the other end of the diode D1 is connected with a power supply.
In one embodiment, the diode D1 has a model number of 1N 4148.
Above-mentioned magnetic particle current's detection circuitry, through the collection of resistance R1 to magnetic particle voltage signal and calculate the current signal, to magnetic particle voltage signal through first filtering unit, the second filtering unit, third filtering unit filtering and voltage amplification unit, the voltage follows the amplification of output unit and gives the singlechip with output stronger voltage signal afterwards, the singlechip is compared with preset data back, judge whether the current value belongs to normal scope and send for tension control system, the output quantity of magnetic is adjusted by tension control system, current structure is simple, therefore, the carrier wave prepaid electric energy meter is low in cost, the current value degree of accuracy of detection is high.
Drawings
Fig. 1 is a circuit diagram of a circuit for detecting magnetic particle current 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 "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
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 magnetic particle current detection circuit includes a resistor R1, a resistor R7, a voltage amplification unit 100, a first filter unit 200, a second filter unit 300, a third filter unit 400, and a voltage follower output unit 500, wherein a signal output terminal of the resistor R1 is connected to a signal input terminal of the first filter unit 200, the signal output terminal of the first filtering unit 200 is connected to the signal input terminal of the second filtering unit 300, a signal output terminal of the second filtering unit 300 is connected to a signal input terminal of the voltage amplifying unit 100, the signal output end of the voltage amplifying unit 100 is connected to the signal input end of the third filtering unit 400, the signal output end of the third filtering unit 400 is connected to the signal input end of the voltage following output unit 500, and the signal output end of the voltage following output unit 500 is connected to one end of the resistor R7.
The first filtering unit 200 comprises a resistor R2 and a capacitor C1, wherein the resistor R2 and the capacitor C1 are connected in series; the second filtering unit 300 comprises a resistor R3 and a capacitor C2, wherein the resistor R3 and the capacitor C2 are connected in series; the voltage amplifying unit 100 includes a first operational amplifier U1B; the third filter unit 400 includes a resistor R6 and a capacitor C4, and the resistor R6 and the capacitor C4 are connected in series.
After the magnetic powder works, the resistor R1 is connected in series into the magnetic powder, the resistance of the resistor R1 is determined by collecting the voltage at two ends of the resistor R1, and the current is calculated according to the formula of U-IR. The working voltage of the magnetic powder is a PWM chopping signal, so that voltage signals at two ends of the resistor R1 need to be filtered by the RC of the resistor R2 and the first filter unit 200 of the capacitor C1, the output voltage signals are sawtooth wave signals, the sawtooth wave signals are filtered by the resistor R3 and the second filter unit 300 of the capacitor C2 to output relatively smooth direct current voltage signals, the direct current voltage signals are amplified by the first operational amplifier U1B of the voltage amplifying unit 100, and then subjected to RC filtering by the resistor R6 and the third filter unit 400 of the capacitor C4, the output direct current voltage signals are subjected to follow-up output by the second operational amplifier U1A of the voltage follow-up output unit 500, so that a strong voltage signal is output to the single chip microcomputer, the single chip microcomputer compares the input voltage value with the preset voltage value and the preset current value, thereby determining whether the current value of R1 falls within a normal range, and sending the structure to a tension control system, wherein the tension control system adjusts the output quantity of the magnetic powder according to the current value.
Like this, magnetic particle current's detection circuitry, through the collection of resistance R1 to magnetic particle voltage signal and calculate the current signal, to magnetic particle voltage signal through first filtering unit, the second filtering unit, third filtering unit filtering and voltage amplification unit, the voltage follows the amplification of output unit and then outputs stronger voltage signal for the singlechip, the singlechip is compared with preset data back, judge whether the current value belongs to normal scope and send for tension control system, the output quantity of magnetic is adjusted by tension control system, current structure is simple, therefore, the carrier wave prepaid electric energy meter is low in cost, the current value degree of accuracy of detection is high.
In one embodiment, in order to make the output voltage signal more stable, the detection circuit further includes a resistor R8 and a capacitor C6, and the resistor R8 and the capacitor C6 are connected in parallel and are respectively connected to one end of the resistor R7.
Therefore, the resistor R8 and the capacitor C6 are connected in parallel, so that a better filtering effect can be achieved, high-frequency signals are attenuated, and output voltage signals are more stable.
In one embodiment, in order to better protect the single chip microcomputer from being damaged, the detection circuit further comprises a diode D1, one end of the diode D1 is connected with the IO port of the single chip microcomputer, and the other end of the diode D1 is connected with a power supply.
Like this, diode D1 one end is connected the singlechip IO mouth, and 3.3V power is connected to one end, constitutes the clamp voltage circuit, and effectual protection singlechip can not cause the damage because of the voltage is too big.
In one embodiment, the diode D1 has a model number of 1N 4148.
The detection circuit further comprises a capacitor C5, and one end of the capacitor C5 is connected with the VCC end.
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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A detection circuit of magnetic particle current is characterized in that: including resistance R1, resistance R7, voltage amplification unit, first filter unit, second filter unit, third filter unit, voltage follow output unit, resistance R1's signal output part with the signal input part of first filter unit is connected, the signal output part of first filter unit with the signal input part of second filter unit is connected, the signal output part of second filter unit with the signal input part of voltage amplification unit is connected, the signal output part of voltage amplification unit is connected with the signal input part of third filter unit, the signal output part of third filter unit with the signal input part of voltage follow output unit is connected, and the signal output part of voltage follow output unit is connected with the one end of resistance R7.
2. The magnetic particle current detection circuit according to claim 1, wherein: the first filtering unit comprises a resistor R2 and a capacitor C1, and the resistor R2 and the capacitor C1 are connected in series.
3. The magnetic particle current detection circuit according to claim 1, wherein: the second filtering unit comprises a resistor R3 and a capacitor C2, and the resistor R3 and the capacitor C2 are connected in series.
4. The magnetic particle current detection circuit according to claim 1, wherein: the voltage amplifying unit includes a first operational amplifier U1B.
5. The magnetic particle current detection circuit according to claim 1, wherein: the third filtering unit comprises a resistor R6 and a capacitor C4, and the resistor R6 and the capacitor C4 are connected in series.
6. The magnetic particle current detection circuit according to claim 1, wherein: the detection circuit further comprises a resistor R8 and a capacitor C6, wherein the resistor R8 and the capacitor C6 are connected in parallel and are respectively connected with one end of the resistor R7.
7. The magnetic particle current detection circuit according to claim 1, wherein: the detection circuit further comprises a diode D1, one end of the diode D1 is connected with the IO port of the single chip microcomputer, and the other end of the diode D1 is connected with a power supply.
8. The magnetic particle current detection circuit according to claim 7, wherein: the model of the diode D1 is 1N 4148.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021307449.XU CN212586447U (en) | 2020-07-07 | 2020-07-07 | Detection circuit for magnetic particle current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021307449.XU CN212586447U (en) | 2020-07-07 | 2020-07-07 | Detection circuit for magnetic particle current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212586447U true CN212586447U (en) | 2021-02-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021307449.XU Active CN212586447U (en) | 2020-07-07 | 2020-07-07 | Detection circuit for magnetic particle current |
Country Status (1)
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|---|---|
| CN (1) | CN212586447U (en) |
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2020
- 2020-07-07 CN CN202021307449.XU patent/CN212586447U/en active Active
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