CN104536416A - Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system - Google Patents
Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system Download PDFInfo
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- CN104536416A CN104536416A CN201410818838.1A CN201410818838A CN104536416A CN 104536416 A CN104536416 A CN 104536416A CN 201410818838 A CN201410818838 A CN 201410818838A CN 104536416 A CN104536416 A CN 104536416A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention relates to an analog quantity input acquisition circuit for restraining electromagnetic interference in an industrial control system. The input end of an acquisition signal I/V conversion circuit is connected with a differential signal input end, and the acquisition signal I/V conversion circuit is used for converting an analog quantity input current signal into a voltage signal; the differential signal input end is connected with a TVS surge protection circuit, the output end of the acquisition signal I/V conversion circuit is connected with the input end of a common mode choke, the output end of the common mode choke is connected with the input end of a high-frequency noise restraining circuit, the output end of the high-frequency noise restraining circuit is connected with the input end of an attenuation filter circuit, the output end of the attenuation filter circuit is connected with the input end of a band-pass filter, and the output end of the band-pass filter is used for signal output. A protection element is added into the analog acquisition signal input end, the band-pass filter is arranged, and signal acquisition unstability and shaking and even AD converter crashing caused by caused by electromagnetic interference are effectively restrained.
Description
Technical field
The present invention relates to industrial control system field, particularly relate to the analog input Acquisition Circuit suppressing electromagnetic interference (EMI) in a kind of industrial control system.
Background technology
In industrial control system, current input module primary responsibility gathers the simulating signal at scene (4-20mA), becomes digital signal after conversion, sends host computer to by RS-485 communication.Equipment on the spot due to DCS system Information Monitoring is in the occasion that there are the starting of frequency conversion control device, great-power electromagnetic, GPS high-frequency signal wireless transmitter in scene mostly, these electromagnetic interference (EMI) are superimposed upon on collection signal end, directly affect measuring accuracy and control accuracy.Therefore, require in the design process, the anti-electromagnetic interference capability in collection of simulant signal process should be taken into full account, effectively suppress electromagnetic interference (EMI), improve the reliability of system O&M.
At present, conventional implementation method channel separation or instrumentation amplifier collection signal nothing more than, to input end signal simple process, ensures the noiseproof feature of acquisition channel.Existing scheme one uses based on linear optical coupling isolation, can play certain suppression EMC effect, but uses in other words in the process using linear optical coupling device in the linearization of optocoupler, and its linearity often can not be entirely satisfactory.Existing scheme two instrumentation amplifier collection signal, instrument amplifier collection signal is after simple process, by the appropriate amplifying signal of instrument amplifier, enter AD converter, AD converter is imported in single-chip microcomputer after simulating signal is converted to digital signal, although solve linearizing problem, and done a definite limitation EMC processing of circuit, but process is also incomplete for it, and to the suppression burst of pulses effect in EMC, the effects such as surge interference are not obvious at all.
Summary of the invention
The present invention be directed to the deficiencies in the prior art; provide the analog input Acquisition Circuit suppressing electromagnetic interference (EMI) in a kind of industrial control system; by adding protective element at analog acquisition signal input part; and insert bandpass filter, the effective electromagnetic interference (EMI) that suppresses brings signals collecting shakiness, shake, the problem of even AD converter deadlock; simultaneously to the linearization of collection signal; picking rate all can be met, and cost advantage is obvious, meets the application of existing DCS system preferably.
The present invention is the technical scheme solving the problems of the technologies described above employing: the analog input Acquisition Circuit suppressing electromagnetic interference (EMI) in a kind of industrial control system, comprise collection signal I/V change-over circuit, common mode choke, high frequency noise suppresses circuit, attenuation filter circuit, bandpass filter, the input end of described collection signal I/V change-over circuit is connected with differential signal input, for analog input current signal is converted to voltage signal, described differential signal input is connected with TVS surge protection circuit, the output terminal of described collection signal I/V change-over circuit is connected with the input end of common mode choke, output terminal and the high frequency noise of described common mode choke suppress the input end of circuit to be connected, described high frequency noise suppresses the output terminal of circuit to be connected with the input end of attenuation filter circuit, the described output terminal of attenuation filter circuit is connected with the input end of bandpass filter, the output terminal of bandpass filter is used for signal and exports.
Described collection signal I/V change-over circuit adopts precision resistance R1, and the two ends of precision resistance R1 are connected with differential signal input IN+, IN-respectively.
Described TVS surge protection circuit comprises transient state and suppresses diode DD1 and two higfh-tension ceramics electric capacity; described transient state suppresses one end of diode DD1 to be connected with one end of differential signal input IN+, the first higfh-tension ceramics electric capacity C1 respectively; the other end ground connection of the first higfh-tension ceramics electric capacity C1; described transient state suppresses the other end of diode DD1 to be connected with one end of differential signal input IN-, the second higfh-tension ceramics electric capacity C2 respectively, the other end ground connection of the second higfh-tension ceramics electric capacity C2.
Described common mode choke adopts model to be the common mode choke of ACM4532-102-2P.
Described high frequency noise suppresses circuit to comprise the first inductance L 1 and the second inductance L 2, described one end of first inductance L 1 is connected with the first output terminal of common mode choke, the other end of described first inductance L 1 is connected with the first input end of attenuation filter circuit, described one end of second inductance L 2 is connected with the second output terminal of common mode choke, and the described other end of the second inductance L 2 is connected with the second input end of attenuation filter circuit.
Described attenuation filter circuit comprises follows filtering circuit, attenuator circuit, described input end of following filtering circuit suppresses the output terminal of circuit to be connected with high frequency noise, the input end of described output terminal and attenuator circuit of following filtering circuit is connected, and the output terminal of described attenuator circuit is connected with the input end of bandpass filter.
Described filtering circuit of following comprises the second resistance R2, 3rd resistance R3, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, one end and the high frequency noise of described second resistance R2 suppress the first output terminal of circuit to be connected, the other end of described second resistance R2 respectively with one end of the 3rd electric capacity C3, one end of 4th electric capacity C4 connects, the other end ground connection of the 3rd electric capacity C3, one end and the high frequency noise of described 3rd resistance R3 suppress the second output terminal of circuit to be connected, the other end of described 3rd resistance R3 respectively with one end of the 5th electric capacity C5, the other end of the 4th electric capacity C4 connects, the other end ground connection of the 5th electric capacity C5, the two ends of the 4th electric capacity C4 are connected with two input ends of attenuator circuit respectively.
Described attenuator circuit comprises the first amplifier A8A, 3rd amplifier A8C, four high guaily unit A8D and some resistance, electric capacity, the in-phase input end of described 3rd amplifier A8C is connected with first output terminal of following filtering circuit, the inverting input of described 3rd amplifier A8C respectively with one end of the 5th resistance R5, one end of 6th resistance R6 connects, the other end of described 6th resistance R6 is connected with the output terminal of the 3rd amplifier A8C, the in-phase input end of described four high guaily unit A8D is connected with second output terminal of following filtering circuit, the inverting input of described four high guaily unit A8D respectively with the other end of the 5th resistance R5, one end of 7th resistance R7 connects, the other end of described 7th resistance R7 is connected with the output terminal of four high guaily unit A8D, the output terminal of described 3rd amplifier A8C is connected with one end of the 8th resistance R8, the other end of described 8th resistance R8 respectively with one end of the tenth resistance R10, one end of 6th electric capacity C6, the in-phase input end of described first amplifier A8A connects, the other end of the tenth resistance R10, the equal ground connection of the other end of the 6th electric capacity C6, the output terminal of described four high guaily unit A8D is connected with one end of the 9th resistance R9, the other end of described 9th resistance R9 respectively with one end of the 11 resistance R11, one end of 7th electric capacity C7, the inverting input of described first amplifier A8A connects, the other end of the 11 resistance R11, the other end of the 7th electric capacity C7 is all connected with the output terminal of the first amplifier A8A.
Described bandpass filter comprises the second amplifier A8B and some resistance, electric capacity, the in-phase input end of described second amplifier A8B respectively with one end of the 13 resistance R13, one end of tenth electric capacity C10 connects, the other end ground connection of described tenth electric capacity C10, the described other end of the 13 resistance R13 and one end of the 12 resistance R12, one end of 11 electric capacity C11 connects, the other end of the 12 resistance R12 is connected with the output terminal of attenuation filter circuit, the other end of the 11 electric capacity C11 is connected with the output terminal of the second amplifier A8B, the inverting input of described second amplifier A8B is connected with the output terminal of the second amplifier A8B through the 13 resistance R13, the output terminal of the second amplifier A8B is connected with one end of the 4th resistance R4, the other end output signal of the 4th resistance R4, the other end of the 4th resistance R4 is through the 12 electric capacity C12 ground connection.
The present invention adopts the beneficial effect of technique scheme to be: analog acquisition passage of the present invention is without the need to isolation; by inserting effective protective element; as paster higfh-tension ceramics electric capacity, transient state suppress diode, common mode choke, inductance, bandpass filter etc.; the electromagnetic interference (EMI) that the burst of pulses that effective suppression signal input part brings, surge, common mode, radio frequency, string mould etc. bring; performance is good, improves reliability and the security of control system.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is first half circuit diagram of the present invention;
Fig. 3 is latter half circuit diagram of the present invention.
In accompanying drawing, 1 is TVS surge protection circuit, and 2 is collection signal I/V change-over circuit, and 3 is common mode choke, and 4 is high frequency noise suppression circuit, and 5 for following filtering circuit, and 6 is attenuator circuit, and 7 is bandpass filter.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
See Fig. 1 to Fig. 3, the embodiment of the analog input Acquisition Circuit of electromagnetic interference (EMI) is suppressed in a kind of industrial control system, the analog input Acquisition Circuit of electromagnetic interference (EMI) is suppressed in a kind of industrial control system, comprise collection signal I/V change-over circuit 2, common mode choke 3, high frequency noise suppresses circuit 4, attenuation filter circuit, bandpass filter 7, the input end of described collection signal I/V change-over circuit is connected with differential signal input, for analog input current signal is converted to voltage signal, described differential signal input is connected with TVS surge protection circuit 1, the output terminal of described collection signal I/V change-over circuit is connected with the input end of common mode choke, output terminal and the high frequency noise of described common mode choke suppress the input end of circuit to be connected, described high frequency noise suppresses the output terminal of circuit to be connected with the input end of attenuation filter circuit, the described output terminal of attenuation filter circuit is connected with the input end of bandpass filter, the output terminal of bandpass filter is used for signal and exports.
Described collection signal I/V change-over circuit adopts precision resistance R1, and the two ends of precision resistance R1 are connected with differential signal input IN+, IN-respectively.
Described TVS surge protection circuit comprises transient state and suppresses diode DD1 and two higfh-tension ceramics electric capacity; described transient state suppresses one end of diode DD1 to be connected with one end of differential signal input IN+, the first higfh-tension ceramics electric capacity C1 respectively; the other end ground connection of the first higfh-tension ceramics electric capacity C1; described transient state suppresses the other end of diode DD1 to be connected with one end of differential signal input IN-, the second higfh-tension ceramics electric capacity C2 respectively, the other end ground connection of the second higfh-tension ceramics electric capacity C2.
Described common mode choke adopts model to be the common mode choke of ACM4532-102-2P.
Described high frequency noise suppresses circuit to comprise the first inductance L 1 and the second inductance L 2, described one end of first inductance L 1 is connected with the first output terminal of common mode choke, the other end of described first inductance L 1 is connected with the first input end of attenuation filter circuit, described one end of second inductance L 2 is connected with the second output terminal of common mode choke, and the described other end of the second inductance L 2 is connected with the second input end of attenuation filter circuit.
Described attenuation filter circuit comprises follows filtering circuit 5, attenuator circuit 6, described input end of following filtering circuit suppresses the output terminal of circuit to be connected with high frequency noise, the input end of described output terminal and attenuator circuit of following filtering circuit is connected, and the output terminal of described attenuator circuit is connected with the input end of bandpass filter.
Described filtering circuit of following comprises the second resistance R2, 3rd resistance R3, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, one end and the high frequency noise of described second resistance R2 suppress the first output terminal of circuit to be connected, the other end of described second resistance R2 respectively with one end of the 3rd electric capacity C3, one end of 4th electric capacity C4 connects, the other end ground connection of the 3rd electric capacity C3, one end and the high frequency noise of described 3rd resistance R3 suppress the second output terminal of circuit to be connected, the other end of described 3rd resistance R3 respectively with one end of the 5th electric capacity C5, the other end of the 4th electric capacity C4 connects, the other end ground connection of the 5th electric capacity C5, the two ends of the 4th electric capacity C4 are connected with two input ends of attenuator circuit respectively.
Described attenuator circuit comprises the first amplifier A8A, 3rd amplifier A8C, four high guaily unit A8D and some resistance, electric capacity, the in-phase input end of described 3rd amplifier A8C is connected with first output terminal of following filtering circuit, the inverting input of described 3rd amplifier A8C respectively with one end of the 5th resistance R5, one end of 6th resistance R6 connects, the other end of described 6th resistance R6 is connected with the output terminal of the 3rd amplifier A8C, the in-phase input end of described four high guaily unit A8D is connected with second output terminal of following filtering circuit, the inverting input of described four high guaily unit A8D respectively with the other end of the 5th resistance R5, one end of 7th resistance R7 connects, the other end of described 7th resistance R7 is connected with the output terminal of four high guaily unit A8D, the output terminal of described 3rd amplifier A8C is connected with one end of the 8th resistance R8, the other end of described 8th resistance R8 respectively with one end of the tenth resistance R10, one end of 6th electric capacity C6, the in-phase input end of described first amplifier A8A connects, the other end of the tenth resistance R10, the equal ground connection of the other end of the 6th electric capacity C6, the output terminal of described four high guaily unit A8D is connected with one end of the 9th resistance R9, the other end of described 9th resistance R9 respectively with one end of the 11 resistance R11, one end of 7th electric capacity C7, the inverting input of described first amplifier A8A connects, the other end of the 11 resistance R11, the other end of the 7th electric capacity C7 is all connected with the output terminal of the first amplifier A8A.
Described bandpass filter comprises the second amplifier A8B and some resistance, electric capacity, the in-phase input end of described second amplifier A8B respectively with one end of the 13 resistance R13, one end of tenth electric capacity C10 connects, the other end ground connection of described tenth electric capacity C10, the described other end of the 13 resistance R13 and one end of the 12 resistance R12, one end of 11 electric capacity C11 connects, the other end of the 12 resistance R12 is connected with the output terminal of attenuation filter circuit, the other end of the 11 electric capacity C11 is connected with the output terminal of the second amplifier A8B, the inverting input of described second amplifier A8B is connected with the output terminal of the second amplifier A8B through the 13 resistance R13, the output terminal of the second amplifier A8B is connected with one end of the 4th resistance R4, the other end output signal of the 4th resistance R4, the other end of the 4th resistance R4 is through the 12 electric capacity C12 ground connection.
Input reference signal: electric current 4-20mA, voltage 1-5V.Input pattern signal: Differential Input mode.
In figure, R1 is 250 Ω precision resistances, and fundamental purpose is that analog input current signal is converted to voltage signal.
C1, C2 are higfh-tension ceramics electric capacity, use over the ground respectively at differential signal input, have better effects to the interference of suppression burst of pulses, this circuit theory is in burst of pulses process of the test, continue 1 minute pulse signal and be superimposed on signal end, signal is without any shake, and precision keeps 0.1%.
DD1 is 6.8V Transient Suppression Diode, and being called for short TVS, is a kind of high-effect protection device of diode form.When the two poles of the earth of TVS diode are subject to reverse transient state high energy impact events; it can with the speed of 10-12 second-time; the high impedance of its two interpolar is become Low ESR; absorb the surge power up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value 6.8V; effectively protect the precision components in electronic circuit, from the damage of various surge pulse.
XQ1 is the ACM4532-102-2P common mode choke of Japanese TDK company, the common mode interference suppression device of its to be one with ferrite be magnetic core, measure-alike by two, the coil that the number of turn is identical is wound on same ferrite toroidal magnetic core symmetrically, its principle of work is that magnetic flux when flowing through common mode current in magnet ring superposes mutually, thus there is sizable inductance value, inhibiting effect is played to common mode current.
L1 and L2 is inductance, and object has good inhibiting effect to high frequency noise, effectively can resist Radio frequency interference (RFI).
R2, R3, C3, C4, C5 are for following filtering circuit.
After following filtering circuit, utilize four high guaily unit and several precision resistance R5-R11 to design an attenuator circuit, attenuator circuit formula is:
β=
，
Through calculating, known attenuation multiple β is 0.459 times, and simulating signal input range linearization table is as shown in the table:
Table 1 simulating signal input linear table
After signal attenuation, use bandpass filter, by the configuration to electric capacity, resistance and inductance parameters, select resistance parameter to be 20K here, capacitance parameter is 4.7uF.Other interfering frequencies produced in 50Hz frequency range by effectively suppressing industry control industry, reach anti-series mode interference object.
Claims (9)
1. in an industrial control system, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: comprise collection signal I/V change-over circuit, common mode choke, high frequency noise suppresses circuit, attenuation filter circuit, bandpass filter, the input end of described collection signal I/V change-over circuit is connected with differential signal input, for analog input current signal is converted to voltage signal, described differential signal input is connected with TVS surge protection circuit, the output terminal of described collection signal I/V change-over circuit is connected with the input end of common mode choke, output terminal and the high frequency noise of described common mode choke suppress the input end of circuit to be connected, described high frequency noise suppresses the output terminal of circuit to be connected with the input end of attenuation filter circuit, the described output terminal of attenuation filter circuit is connected with the input end of bandpass filter, the output terminal of bandpass filter is used for signal and exports.
2. in industrial control system according to claim 1, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described collection signal I/V change-over circuit adopts precision resistance (R1), and the two ends of precision resistance (R1) are connected with differential signal input (IN+, IN-) respectively.
3. in industrial control system according to claim 1, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described TVS surge protection circuit comprises transient state and suppresses diode (DD1) and two higfh-tension ceramics electric capacity, one end that described transient state suppresses diode (DD1) respectively with differential signal input (IN+), one end of first higfh-tension ceramics electric capacity (C1) connects, the other end ground connection of the first higfh-tension ceramics electric capacity (C1), the other end that described transient state suppresses diode (DD1) respectively with differential signal input (IN-), one end of second higfh-tension ceramics electric capacity (C2) connects, the other end ground connection of the second higfh-tension ceramics electric capacity (C2).
4. suppress the analog input Acquisition Circuit of electromagnetic interference (EMI) in industrial control system according to claim 1, it is characterized in that: described common mode choke adopts model to be the common mode choke of ACM4532-102-2P.
5. in industrial control system according to claim 1, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described high frequency noise suppresses circuit to comprise the first inductance (L1) and the second inductance (L2), described one end of first inductance (L1) is connected with the first output terminal of common mode choke, the other end of described first inductance (L1) is connected with the first input end of attenuation filter circuit, described one end of second inductance (L2) is connected with the second output terminal of common mode choke, the described other end of the second inductance (L2) is connected with the second input end of attenuation filter circuit.
6. in industrial control system according to claim 1, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described attenuation filter circuit comprises follows filtering circuit, attenuator circuit, described input end of following filtering circuit suppresses the output terminal of circuit to be connected with high frequency noise, the input end of described output terminal and attenuator circuit of following filtering circuit is connected, and the output terminal of described attenuator circuit is connected with the input end of bandpass filter.
7. in industrial control system according to claim 6, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described in follow filtering circuit and comprise the second resistance (R2), 3rd resistance (R3), 3rd electric capacity (C3), 4th electric capacity (C4), 5th electric capacity (C5), one end and the high frequency noise of described second resistance (R2) suppress the first output terminal of circuit to be connected, the other end of described second resistance (R2) respectively with one end of the 3rd electric capacity (C3), one end of 4th electric capacity (C4) connects, the other end ground connection of the 3rd electric capacity (C3), one end of described 3rd resistance (R3) suppresses the second output terminal of circuit to be connected with high frequency noise, the other end of described 3rd resistance (R3) respectively with one end of the 5th electric capacity (C5), the other end of the 4th electric capacity (C4) connects, the other end ground connection of the 5th electric capacity (C5), the two ends of the 4th electric capacity (C4) are connected with two input ends of attenuator circuit respectively.
8. in industrial control system according to claim 6, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described attenuator circuit comprises the first amplifier (A8A), 3rd amplifier (A8C), four high guaily unit (A8D) and some resistance, electric capacity, the in-phase input end of described 3rd amplifier (A8C) is connected with first output terminal of following filtering circuit, the inverting input of described 3rd amplifier (A8C) respectively with one end of the 5th resistance (R5), one end of 6th resistance (R6) connects, the other end of described 6th resistance (R6) is connected with the output terminal of the 3rd amplifier (A8C), the in-phase input end of described four high guaily unit (A8D) is connected with second output terminal of following filtering circuit, the inverting input of described four high guaily unit (A8D) respectively with the other end of the 5th resistance (R5), one end of 7th resistance (R7) connects, the other end of described 7th resistance (R7) is connected with the output terminal of four high guaily unit (A8D), the output terminal of described 3rd amplifier (A8C) is connected with one end of the 8th resistance (R8), the other end of described 8th resistance (R8) respectively with one end of the tenth resistance (R10), one end of 6th electric capacity (C6), the in-phase input end of described first amplifier (A8A) connects, the other end of the tenth resistance (R10), the equal ground connection of the other end of the 6th electric capacity (C6), the output terminal of described four high guaily unit (A8D) is connected with one end of the 9th resistance (R9), the other end of described 9th resistance (R9) respectively with one end of the 11 resistance (R11), one end of 7th electric capacity (C7), the inverting input of described first amplifier (A8A) connects, the other end of described 11 resistance (R11), the other end of the 7th electric capacity (C7) is all connected with the output terminal of the first amplifier (A8A).
9. in industrial control system according to claim 1, suppress the analog input Acquisition Circuit of electromagnetic interference (EMI), it is characterized in that: described bandpass filter comprises the second amplifier (A8B) and some resistance, electric capacity, the in-phase input end of described second amplifier (A8B) respectively with one end of the 13 resistance (R13), one end of tenth electric capacity (C10) connects, the other end ground connection of described tenth electric capacity (C10), the described other end of the 13 resistance (R13) and one end of the 12 resistance (R12), one end of 11 electric capacity (C11) connects, the other end of the 12 resistance (R12) is connected with the output terminal of attenuation filter circuit, the other end of the 11 electric capacity (C11) is connected with the output terminal of the second amplifier (A8B), the inverting input of described second amplifier (A8B) is connected with the output terminal of the second amplifier (A8B) through the 13 resistance (R13), the output terminal of the second amplifier (A8B) is connected with one end of the 4th resistance (R4), the other end output signal of the 4th resistance (R4), the other end of the 4th resistance (R4) is through the 12 electric capacity (C12) ground connection.
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| CN109831181A (en) * | 2019-03-28 | 2019-05-31 | 华峰测控技术(天津)有限责任公司 | A kind of noise suppression circuit and the test circuit including the noise suppression circuit |
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| CN106301275A (en) * | 2016-08-30 | 2017-01-04 | 国网安徽省电力公司岳西县供电公司 | A kind of noise muffler |
| CN107302360A (en) * | 2017-06-16 | 2017-10-27 | 长沙变化率信息技术有限公司 | A kind of general-purpose simulation sample circuit |
| CN108181843A (en) * | 2017-11-29 | 2018-06-19 | 重庆川仪自动化股份有限公司 | A kind of automatic aeration monitoring device |
| CN109167508A (en) * | 2018-11-05 | 2019-01-08 | 郑州煤机液压电控有限公司 | Has the Mine-used I. S power supply for eliminating spark energy |
| CN109831181A (en) * | 2019-03-28 | 2019-05-31 | 华峰测控技术(天津)有限责任公司 | A kind of noise suppression circuit and the test circuit including the noise suppression circuit |
| CN112865837A (en) * | 2020-12-31 | 2021-05-28 | 深圳市普威技术有限公司 | Communication apparatus and communication system |
| CN112994425A (en) * | 2021-02-07 | 2021-06-18 | 杰华特微电子（杭州）有限公司 | Noise suppression method, noise suppression circuit and switching circuit |
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