CN210964223U - Anti-interference circuit and candle type filter - Google Patents
Anti-interference circuit and candle type filter Download PDFInfo
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- CN210964223U CN210964223U CN201920989977.9U CN201920989977U CN210964223U CN 210964223 U CN210964223 U CN 210964223U CN 201920989977 U CN201920989977 U CN 201920989977U CN 210964223 U CN210964223 U CN 210964223U
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Abstract
The utility model discloses an anti jamming circuit and candle filter, which comprises a power supply, the power is provided with the anodal and power supply negative pole of power supply, the power still is provided with the parallelly connected power supply channel of a plurality of, one of them power supply channel is provided with passageway anodal and passageway negative pole, passageway anodal and passageway negative pole electricity are connected with a flowmeter, be provided with pi type filter circuit in the power, the anodal electricity that supplies power is connected with passageway anodal, the flowmeter is supplied power by power and power supply channel two tunnel simultaneously, the common mode rejection ratio has been strengthened, interference signal passes through the inside pi type filter circuit absorption of power, make flowmeter detected signal's stability show the improvement.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a candle filter of this anti-jamming circuit is used to anti-jamming circuit.
Background
A candle filter and a diatomite filtering technology are used for filtering in the current soy sauce or beer production process, the candle filter controls a plurality of electronic instruments to carry out automation control operation by adopting P L C, the automation degree is high, but a frequency converter is required to convert external alternating current into direct current to supply power to the electronic instruments, particularly, an electronic flowmeter adopted in the electronic instruments is very easily influenced by a power supply, because the frequency converter is a high-frequency interference source for the electronic flowmeter, the electronic flowmeter does not have an interference suppression function, the frequency converter can objectively influence weak detection signals generated by the electronic flowmeter to cause interference, and thus detection distortion is caused.
Those skilled in the art have therefore endeavored to develop a tamper-resistant circuit that improves the accuracy of the detected signal.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to provide an anti-jamming circuit for improving the precision of the detection signal.
In order to achieve the above object, the utility model provides an anti-jamming circuit, which comprises a power supply, the power is provided with the parallelly connected power supply channel of a plurality of, one of them power supply channel is provided with passageway positive pole and passageway negative pole, passageway positive pole and passageway negative pole electricity are connected with a flowmeter, be provided with pi type filter circuit in the power, the power is provided with power supply positive pole and power supply negative pole, power supply positive pole with passageway positive pole electricity is connected.
The pi-type filter circuit is a pi-type RC filter circuit.
The current receiving range of the flowmeter is 4-20 mA.
The power supply voltage of the power supply is 24V.
The utility model also provides a candle formula filter, including above-mentioned anti-jamming circuit and a flowmeter, the positive pole and the negative pole of flowmeter respectively with passageway positive pole and passageway negative pole electricity are connected.
The utility model has the advantages that: the utility model discloses an anti-jamming circuit, including the power, the power is provided with the anodal and power supply negative pole of power supply, the power still is provided with the parallelly connected power supply channel of a plurality of, one of them power supply channel is provided with passageway anodal and passageway negative pole, be provided with pi type filter circuit in the power, the anodal and passageway positive pole electricity of power supply is connected, the flowmeter is supplied power by power and two tunnel simultaneously of power supply channel, common mode rejection ratio has been strengthened, interference signal passes through the inside pi type filter circuit absorption of power, make flowmeter detected signal's stability show the improvement.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein it is noted that, in the description of the invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular manner, and therefore should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in figure 1, the anti-interference circuit comprises a power supply, wherein the power supply is provided with a power supply anode 1 and a power supply cathode 2, the power supply is further provided with a plurality of power supply channels which are connected in parallel, one of the power supply channels is provided with a channel anode 3 and a channel cathode 4, the channel anode 3 and the channel cathode 4 are electrically connected with a flowmeter, a pi-type filter circuit is arranged in the power supply, the power supply anode is electrically connected with the channel anode, the flowmeter is simultaneously powered by two paths of the power supply and the power supply channels, the common-mode rejection ratio is enhanced, interference signals are absorbed by the pi-type filter circuit in the power supply, and the stability of detection signals of the flowmeter.
The pi-type filter circuit is a pi-type RC filter circuit, the pi-type filter circuit comprises two capacitors and an inductor, the input and the output of the pi-type RC filter circuit are low in impedance, and the pi-type RC filter circuit is a commonly used filter means in the electronic field. The pi-type filter circuit is a two-stage filter, and has the functions of removing unnecessary harmonic waves and reducing the pulsation of current in a direct-current power supply to make the current smoother. The pi-type RC filter circuit consists of two filter capacitors and a filter resistor, and the first-stage capacitor and the output impedance of the previous stage form first-stage filtering to primarily filter out AC components. Because the capacitance still has impedance for the ac ripple and the impedance of the previous stage is small, a certain ac component still remains after the first stage of filtering. After the filter is subjected to secondary filtering consisting of the filter resistor and the secondary capacitor, the ripple can be reduced again.
In the embodiment, the current receiving range of the flow meter is 4 to 20mA, and the power supply voltage of the power supply is 24V, so as to match the working current range of the pi-type RC filter circuit.
In this embodiment, four power supply channels are provided, which are 1CH, 2CH, 3CH and 4CH, for example, the flowmeter is electrically connected to the 2 nd channel 2CH, and the circuit is designed such that the positive electrode 1 of the power supply is connected to the positive electrode 3 of the 2 nd channel, so that two channels of the power supply and the 2 nd channel 2CH supply power simultaneously, thereby enhancing the common mode rejection ratio, and the interference signal is absorbed by the pi-type filter circuit inside the power supply, so that the stability of the signal detected by the flowmeter is significantly improved.
A candle type filter comprises the anti-interference circuit and a flowmeter, wherein the anode and the cathode of the flowmeter are respectively electrically connected with the anode and the cathode of a channel, and the anode and the cathode of the flowmeter are respectively connected with the anode 3 and the cathode 4 of the 2 nd channel 2CH channel.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. The utility model provides an anti-jamming circuit, includes the power, the power is provided with power supply positive pole and power supply negative pole, the power still is provided with the parallelly connected power supply channel of a plurality of, one of them power supply channel is provided with passageway positive pole and passageway negative pole, characterized by: and a pi-shaped filter circuit is arranged in the power supply, and the power supply anode is electrically connected with the channel anode.
2. The interference rejection circuit as in claim 1 further comprising: the pi-type filter circuit is a pi-type RC filter circuit.
3. A tamper resistant circuit as claimed in claim 1 or 2, wherein: the power supply voltage of the power supply is 24V.
4. A candle type filter is characterized in that: comprising the anti-jamming circuit according to any of claims 1 to 3 and a flow meter having a positive and a negative pole electrically connected to the positive and negative poles of the channel, respectively.
5. A candle filter as in claim 4, wherein: the current receiving range of the flowmeter is 4-20 mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920989977.9U CN210964223U (en) | 2019-06-27 | 2019-06-27 | Anti-interference circuit and candle type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920989977.9U CN210964223U (en) | 2019-06-27 | 2019-06-27 | Anti-interference circuit and candle type filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210964223U true CN210964223U (en) | 2020-07-10 |
Family
ID=71441639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920989977.9U Active CN210964223U (en) | 2019-06-27 | 2019-06-27 | Anti-interference circuit and candle type filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210964223U (en) |
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2019
- 2019-06-27 CN CN201920989977.9U patent/CN210964223U/en active Active
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