CN202363893U - Digital input electromagnetic interference protection circuit - Google Patents
Digital input electromagnetic interference protection circuit Download PDFInfo
- Publication number
- CN202363893U CN202363893U CN2011203308478U CN201120330847U CN202363893U CN 202363893 U CN202363893 U CN 202363893U CN 2011203308478 U CN2011203308478 U CN 2011203308478U CN 201120330847 U CN201120330847 U CN 201120330847U CN 202363893 U CN202363893 U CN 202363893U
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- Prior art keywords
- electromagnetic interference
- digital quantity
- input electromagnetic
- digital input
- inductive element
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Abstract
The utility model discloses a digital input electromagnetic interference protection circuit. The digital input electromagnetic interference protection circuit comprises digital input lines, a ground line, a protected circuit, a transient voltage inhibition element, capacitor elements, and inductive elements for differential mode protection. The transient voltage inhibition element is firstly connected between the two digital lines, the two digital lines are then respectively connected with the inductive elements in series, the two capacitor elements are connected respectively between the two digital lines and the ground line, and finally the two digital lines are connected with the protected circuit in series. The digital input electromagnetic interference protection circuit enables electromagnetic interference of various kinds to be effectively inhibited for attenuation, is fast in protection, is low in attenuation of normal signals, and helps to guarantee the accuracy of normal signals and the safety of a post-stage circuit.
Description
[technical field]
The utility model relates to a kind of electromagnetic interference shielding circuit, particularly relates to a kind of digital quantity input electromagnetic interference (EMI) protection circuit that is used for nuclear power station appearance control system field.
[background technology]
Appearance control system of nuclear power plant is nuclear power plant's " nerve center ", is the important equipment of guaranteeing npp safety, reliability service.Along with development of electronic technology; No matter be to build nuclear power plant or transporting in the equipment replacement of nuclear power plant at present; Mostly that adopts is computer based digitizer control system or senior analogue system; Yet with respect to existing appearance control system, these technology possibly receive the influence of nuclear power plant's electromagnetism and radio frequency interference environment more easily.
According to research report: it is the environmental factor that can influence safe level electricity equipment performance that electromagnetic interference, radio frequency interference and lightning surge have been identified, so guarantees that the Electro Magnetic Compatibility of safe level digitizer control system is to satisfy the important step of the safe and reliable operation of nuclear power plant.The nuclear power station of China mostly is distributed in southern coastal cities; Picture GNPS, Ningde, Fujian nuclear power station, Port of Fangcheng, Guangxi nuclear power station etc.; Specific natural conditions picture thunderbolt, surge etc. very likely cause the inefficacy or the damage of digital quantity input channel in the appearance control system of nuclear power plant; Electromagnetic interference and radio frequency interference possibly cause the information errors of gathering on the digital quantity input channel or lose efficacy, and then judgement that possibly make the mistake and action.
Perhaps to multiple electromagnetic interference, perhaps the accuracy of protection circuit is lower in the prior art.The protection circuit that the utility model provides can be realized the protection to interference signals such as broadband, high-energy, the interference signal that decays effectively, and guarantee the safety of normal signal level waveform and late-class circuit.
The digital quantity input is as one type of important type signal handling in the digitizer control system; If collection capacity receives the information input that electromagnetic interference just might lead to errors; Therefore the electromagnetic protection to it is the basis that guarantees that the back level system is accurately gathered, and the work of assurance system reliable and stable under nuclear power plant's environment.
[summary of the invention]
The utility model provides a kind of electromagnetic interference shielding circuit to nuclear power plant's digital quantity input channel; Can be to the protection that decay such as multiple potential interference such as electromagnetic interference, radio frequency interference, surge in the digital quantity input channel under nuclear power plant's electromagnetic environment; Guarantee normal signal level waveform, and protect late-class circuit effectively.The present invention adopts the basic design of technical scheme to be:
A kind of digital quantity input electromagnetic interference shielding circuit comprises digital quantity incoming line (input), earth connection, also comprises instantaneous voltage restraint component, capacity cell and is used for the inductive element that differential mode protects; Wherein, At first connect instantaneous voltage restraint component between two digital quantity incoming lines, connect with inductive element respectively then, two digital quantity incoming lines are through behind the inductive element; Be connected two capacity cells respectively with between the earth connection again, connect at last and by protective circuit.
Preferably, said instantaneous voltage restraint component is high speed piezo-resistance or high-power TVS pipe, can realize the differential mode protection, suppresses the decay of interference voltage.
Preferably, the said inductive element that is used for the differential mode protection is broadband inductance or broadband magnetic bead, is used for the decay that high-frequency electromagnetic is disturbed.
[description of drawings]
Fig. 1 is a circuit diagram of the present invention;
[embodiment]
Digital quantity input electromagnetic interference shielding circuit as shown in the figure comprises digital quantity incoming line, earth connection, also comprises instantaneous voltage restraint component, capacity cell and is used for the inductive element that differential mode protects; Wherein, At first connect instantaneous voltage restraint component between two digital quantity incoming lines, connect with inductive element respectively then, two digital quantity incoming lines are through behind the inductive element; Be connected two capacity cells respectively with between the earth connection again, connect at last and by protective circuit.
Said instantaneous voltage restraint component T is that high speed piezo-resistance or high-power TVS pipe can disturb overvoltage high speed motion, big through-current capacity are provided, and can realize the differential mode protection, suppresses the decay of interference voltage.
Said inductive element L1 and the L2 that is used for the differential mode protection is broadband inductance or broadband magnetic bead, takes into account protection energy, protection efficiency, and it does not influence the transmission of normal signal, and High-frequency Interference is shown as high impedance, and greatly attenuate high frequency is disturbed.
C1 and C2 are safety Y electric capacity, and the common mode protection is used for the high frequency common mode interference is incorporated into the earth.
When carrying out operate as normal at ordinary times, instantaneous voltage restraint component is in high-impedance state, does not influence the normal transmission of signal.Because the operating frequency of digital quantity is generally the kHz rank,, can not produce decay basically to normal signal so perceptual device is in low impedance state.The electric capacity that is connected between incoming line and the ground wire belongs to common mode filtering electric capacity, can not produce decay to normal signal.When sealing in electromagnetic interference in the digital quantity input channel, instantaneous voltage restraint component can conducting in the extremely short time, energy is decayed, and in the extremely short time, revert to high-impedance state, does not influence normal signal transmission.The perceptual device of series connection disturbs the high-frequency electromagnetic that seals in and shows as high-impedance state, High-frequency Interference is stopped, and do not influence normal signal.Electric capacity between last incoming line and ground wire disturbs for the high frequency common mode that seals in and belongs to low impedance path, with the interference the earth of releasing.
The utility model has solved the technical problem of multiple electromagnetic interference shielding in nuclear power plant's appearance control system digits amount input channel; Effectively multiple electromagnetic interference is suppressed decay; Protect action fast, low, guaranteed the accuracy of digital quantity input collection and the safety of late-class circuit the normal signal decay.
Above content is to combine concrete optimal technical scheme to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (3)
1. a digital quantity input electromagnetic interference shielding circuit comprises digital quantity incoming line, earth connection, it is characterized in that; Also comprise instantaneous voltage restraint component, capacity cell and be used for the inductive element that differential mode protects, wherein, at first connect instantaneous voltage restraint component between two digital quantity incoming lines; Connect with inductive element respectively then; Two digital quantity incoming lines are connected two capacity cells respectively with between the earth connection again through behind the inductive element, connect at last and by protective circuit.
2. a kind of digital quantity input electromagnetic interference shielding circuit according to claim 1 is characterized in that instantaneous voltage restraint component is high speed piezo-resistance or high-power TVS pipe.
3. a kind of digital quantity input electromagnetic interference shielding circuit according to claim 1 is characterized in that the inductive element that is used for the differential mode protection is broadband inductance or broadband magnetic bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203308478U CN202363893U (en) | 2011-09-06 | 2011-09-06 | Digital input electromagnetic interference protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203308478U CN202363893U (en) | 2011-09-06 | 2011-09-06 | Digital input electromagnetic interference protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202363893U true CN202363893U (en) | 2012-08-01 |
Family
ID=46575049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203308478U Expired - Lifetime CN202363893U (en) | 2011-09-06 | 2011-09-06 | Digital input electromagnetic interference protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202363893U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580015A (en) * | 2012-08-07 | 2014-02-12 | 深圳远征技术有限公司 | Thunder filter and electronic device |
| CN104344874A (en) * | 2013-08-05 | 2015-02-11 | 哈尔滨飞机工业集团有限责任公司 | Tester for oil quantity sensor |
| CN106803668A (en) * | 2017-03-08 | 2017-06-06 | 深圳市泛海三江电子股份有限公司 | A kind of sensor external terminal protection device |
| CN107276377A (en) * | 2017-06-06 | 2017-10-20 | 李瑞峰 | A kind of power-supply filter device |
-
2011
- 2011-09-06 CN CN2011203308478U patent/CN202363893U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580015A (en) * | 2012-08-07 | 2014-02-12 | 深圳远征技术有限公司 | Thunder filter and electronic device |
| WO2014023116A1 (en) * | 2012-08-07 | 2014-02-13 | 深圳远征技术有限公司 | Lightning filter and electronic equipment |
| CN103580015B (en) * | 2012-08-07 | 2016-12-21 | 深圳远征技术有限公司 | A kind of LIGHTNING FILTER and electronic equipment |
| CN104344874A (en) * | 2013-08-05 | 2015-02-11 | 哈尔滨飞机工业集团有限责任公司 | Tester for oil quantity sensor |
| CN106803668A (en) * | 2017-03-08 | 2017-06-06 | 深圳市泛海三江电子股份有限公司 | A kind of sensor external terminal protection device |
| CN107276377A (en) * | 2017-06-06 | 2017-10-20 | 李瑞峰 | A kind of power-supply filter device |
| CN107276377B (en) * | 2017-06-06 | 2019-10-29 | 李瑞峰 | A kind of power-supply filter device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120801 |