CN201663544U - Filter module with electromagnetic interference resistance and transient suppression functions - Google Patents

Filter module with electromagnetic interference resistance and transient suppression functions Download PDF

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Publication number
CN201663544U
CN201663544U CN2009202783388U CN200920278338U CN201663544U CN 201663544 U CN201663544 U CN 201663544U CN 2009202783388 U CN2009202783388 U CN 2009202783388U CN 200920278338 U CN200920278338 U CN 200920278338U CN 201663544 U CN201663544 U CN 201663544U
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China
Prior art keywords
voltage
discharge tube
gas discharge
capacitor
transient
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Expired - Fee Related
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CN2009202783388U
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Chinese (zh)
Inventor
丁永平
杨宝山
郭艳辉
王添文
党丽
米海涛
赵昕萌
苏醒
李子森
马丹
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CHINA NORTH INDUSTRY NEW TECHNOLOGY PROMOTION INSTITUTE
BEIJING ZHONGBEI INNOVATION TECHNOLOGY Co Ltd
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CHINA NORTH INDUSTRY NEW TECHNOLOGY PROMOTION INSTITUTE
BEIJING ZHONGBEI INNOVATION TECHNOLOGY Co Ltd
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Priority to CN2009202783388U priority Critical patent/CN201663544U/en
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Abstract

The utility model discloses a filter module with electromagnetic interference resistance and transient suppression functions, which comprises a gas discharge tube, a first inductor, a transient suppression diode, a second inductor, a first capacitor and a second capacitor. One end of the gas discharge tube is connected with the first end of the first inductor, the second end of the first inductor is connected with the first end of the transient suppression diode, the first end of the first capacitor and the first end of the second inductor, the second end of the second inductor is connected with the first end of the second capacitor, further the second end of the gas discharge tube, the second end of the transient suppression diode, the second end of the first capacitor and the second end of the second capacitor are connected one another and are all grounded, and the first end of the gas discharge tube and the first end of the second capacitor are connected to a load. The filter module has the functions of peak transient pulse suppression, surge suppression and EMI suppression, reduces volume of realizing the same effect, reduces purchase cost for users, and increases product competitiveness.

Description

Filtration module with anti-electromagnetic interference and transition inhibit feature
Technical field
The utility model relates to filtration module, more specifically, relates to the filtration module with anti-electromagnetic interference and electromagnetic immunity sexual function.
Background technology
On electronic system and the network line, be subjected to the interference of extraneous instantaneous overvoltage through regular meeting, these interference sources mainly comprise: since break-make inductive load or start and stop high power load, the switching overvoltage that line fault etc. produce; Because the lightning surge that natural phenomenas such as thunder and lightning cause.This overvoltage (or overcurrent) is called surge voltage (or surge current), is that a kind of transition is disturbed.The trouble free service of surge voltage meeting serious harm electronic system.The elimination surge noise disturbs, and prevents that surge harm from being the key problem of connection-related electricity use subset safe and reliable operation always.For fear of surge voltage infringement electronic equipment; the general shunting defensive measure that adopts, be about to surge voltage in the very short time with the earth short circuit, make surge current branch inflow place; reach the purpose that weakens and eliminate overvoltage, overcurrent, thereby play the effect of protection electronic equipments safety operation.
At present, Electromagnetic interference filter is that the most important means that suppress conducted interference also have been widely used in all kinds of military equipments and the civil equipment.The surge suppression device that traditional Electromagnetic interference filter adopts is generally gas discharge tube, Transient Voltage Suppressor, silicon diode etc.The operation principle difference of these devices, but similar voltage-current characteristic is arranged, very little when promptly both end voltage is lower than assigned voltage by electric current, and after both end voltage is higher than assigned voltage, can be index law by electric current and increases.This voltage-current characteristic makes it can satisfy the requirement that surge suppresses cascading water and amplitude limit simultaneously, thereby also just becomes the leading device that surge suppresses.
Adopt separately a kind of in the above-mentioned device,, shortcoming is arranged all separately though all peak voltage is had certain inhibitory action.For example the gas discharge tube residual voltage is higher, the reaction time slow (≤100ns), the operation voltage precision is lower, and follow current (afterflow) is arranged; And the Transient Voltage Suppressor flow-resistant capacity is poor, and discharge capacity is little, generally has only the hundreds of ampere.Therefore according to concrete application scenario, generally adopt one or several the combination in the above-mentioned device to set up corresponding protection circuit.
But, the Electromagnetic interference filter of the above-mentioned device of existing employing can not satisfy the requirement of the above-mentioned interference of inhibition simultaneously for continuing the above building ups of several milliseconds, surge voltage and all very poor for the inhibition effect of the peak voltage of nanosecond rising edge etc.And existing filter volume is big, and it is many to take up room.Simultaneously to continuing the above building ups of several milliseconds, surge voltage and suppressing, then need to buy different suppression devices if desired, cause cost to increase for the peak voltage of nanosecond rising edge.
Therefore, need a kind of filtration module with improved combination function, to continuing the above building ups of several milliseconds, surge voltage and all having good inhibition effect, effectively improve the ability that weaponry and civil equipment are tackled complicated galvanomagnetic effect environment for the peak voltage of nanosecond rising edge etc.And wish that this filtration module volume is little, cost is low, increasing product competitiveness, thereby changes the backward state of the present military equipment of China (system) rapidly.
Summary of the invention
Therefore, the purpose of this utility model is to provide a kind of filtration module that can overcome above-mentioned shortcoming.
The filtration module with combination function according to an embodiment of the present utility model comprises:
Gas discharge tube, the first inductance L a, Transient Suppression Diode V2, the second inductance L b, first capacitor C 1 and second capacitor C 2; Wherein,
First end of described gas discharge tube V1 is connected with first end of the described first inductance L a; Second end of the described first inductance L a all links to each other with first end of first end of described Transient Suppression Diode V2, described first capacitor C 1 and first end of the described second inductance L b; Second end of the described second inductance L b is connected with first end of described second capacitor C 2; Second end of second end of described gas discharge tube V1, second end of described Transient Suppression Diode V2, described first capacitor C 1 is connected with second end of described second capacitor C 2, and equal ground connection; Described first end of described gas discharge tube V1 and first end of described second capacitor C 2 are connected to load.
Therefore, the utility model organically is incorporated in same anti-electromagnetic interference (EMI)/electromagnetic immunity degree (EMS) combination function power filter device by spike ringing pulse inhibition, surge inhibition and EMI are suppressed three big functions, reduced to realize the volume of effect same, reduce user's purchase cost, improved competitiveness of product.The present domestic similar products that also do not have, the successful research and development of product can be filled up the home products blank, effectively improve the ability that weaponry is tackled complicated galvanomagnetic effect environment, and realize good economic benefit.
Description of drawings
In order to explain the utility model, the utility model exemplary embodiment is hereinafter described with reference to the accompanying drawings, wherein:
Figure 1A illustrates switch at the variation schematic diagram that disconnects transient voltage;
Figure 1B illustrates electrical fast transient (eft) and produces principle schematic;
Fig. 2 A illustrates the waveform schematic diagram of single ringing pulse signal;
Fig. 2 B illustrates the repetition rate schematic diagram of electrical fast transient (eft);
Fig. 3 illustrates the circuit theory diagrams according to the filtration module of an embodiment of the present utility model;
Fig. 4 illustrates the insertion damage curve according to the EMI/EMS combination function DC power supply filtration module of a new embodiment of this practicality;
Fig. 5 illustrates the schematic diagram according to the shell sizes of the DC power supply filtration module with EMI/EMS combination function of a new embodiment of this practicality.
Embodiment
The disclosed filtration module of the utility model comprises gas discharge tube, Transient Suppression Diode and one-level filter circuit, wherein, gas discharge tube and Transient Suppression Diode are combined to form spike, surge restraint circuit, and further with combining of one-level filter circuit can realize simultaneously to suppress spike, surge disturbs and the inhibition of conducted interference, thereby realize high loss, the small size passive electromagnetic interference filter module inserted.
As known, be subjected to the interference of extraneous instantaneous signal on electronic system and the network line through regular meeting, these extraneous instantaneous signals are fast transient impulse train, surging signal or the like for example.
Electrical fast transient (eft)
The fast transient impulse train will cause the phenomenons such as dislocation, system reset, EMS memory error and deadlock of digital system.At the IC input, the fast transient impulse train charges to parasitic capacitance, through accumulation, meets and exceeds the immunity level of IC chip at last.May occur that: several pulses (or impulse train of short time) can not cause that digital system lost efficacy, and impulse train will make failure of apparatus for a long time.Each logic element of microprocessor and peripheral components all has corresponding level and noise margin, as long as extraneous noise is no more than the tolerance value of these elements, system just can keep normally; In case the noise of invasive system has surpassed certain tolerance limit, just may cause microprocessor system to make mistakes, become the major reason of error action of device, tripping.
Electrical fast transient (eft) produces a series of short rise time, high-repetition-rate and the low-energy transition disturbing pulse group that cause during as disconnections such as relay contact spring-like movement, motor, timers in switching the inductive load transient process.Figure 1A and Figure 1B are that example illustrates the physical process that electrical fast transient (eft) takes place with discharge process between the mechanical switch contact.Figure 1A illustrates switch at the variation schematic diagram that disconnects transient voltage, and Figure 1B illustrates electrical fast transient (eft) and produces principle schematic.
Shown in Figure 1A, when switch contact disconnects,, can produce a very high back electromotive force on the inductive load and keep original electric current because the electric current in the inductive load (for example inductance) can not suddenly change, according to Lenz's law, this electromotive force E is:
E=dФ/dt=-L(di-dt)
Wherein Ф is the magnetic flux in the inductance, and L is an inductance, and i is the electric current that flows through in the inductance, and t is the time.When switch disconnects, keep the electric current in the inductance, have only the air that punctures between the contact, utilize electric arc to come conducting.Electric arc is meant that free electron in the gas or ion can obtain other atoms of enough energy impacts or molecule, produce glow discharge when the electric field strength on being added in gas was strong, therefore produces more freedom electronics and ion, forms gaseous conductor.This glow discharge can produce very strong electromagnetic radiation.
Referring to Figure 1B, suppose that the contact is from t 0Beginning separates the voltage (V between the contact gradually 1) when surpassing insulation voltage, flashing discharge between the contact makes the voltage instantaneous between the contact descend t 1The time reach zero.This moment, the voltage between the contact began again to rise owing to also have energy in the inductance, because distance continues to increase between the switch contact, institute is so that produce the also increase accordingly of voltage of sparkover, the voltage (V when between the contact between the contact 2) when surpassing insulation voltage once more, sparkover for the second time takes place.Equally, produce the voltage moment decline again between the back contact of sparkover for the second time, t 2The time reach zero, after slowly rise again, then can produce (V for the third time 3), the 4th (V 4) ... sparkover.When the distance between the contact arrives certain degree greatly, glow discharge can take place between the contact, the energy in the inductance all consumes at this moment, and discharge process finishes.Concerning the alternating current 220V electrical network, the voltage amplitude of this electrical fast transient (eft) can reach more than thousands of volts.In electrical fast transient (eft), the rising edge of individual pulse is in nanosecond, and the pulse duration is extremely several milliseconds of tens nanoseconds.Can be referring to Fig. 2 A and Fig. 2 B, wherein Fig. 2 A illustrates the waveform schematic diagram of single ringing pulse signal, and Fig. 2 B illustrates the repetition rate schematic diagram of electrical fast transient (eft).
Electrical fast transient (eft) may influence the operate as normal of equipment by the power port of Electrical and Electronic equipment, the internal circuit that signal port is coupled to equipment, thus the system failure that causes equipment and be attached thereto.Electrical fast transient (eft) is very big to the instrument and equipment destructive power, particularly should especially note for high-power and responsive instrument and equipment.
Surging signal
Surging signal is a kind of transient signal of electric current, voltage or power of propagation along the line, is characterized in first fast rise, slowly descends then.Surge is caused that by switch and thunder and lightning transient voltage wherein switching transient is relevant with following factor: harassing and wrecking are switched in the main power source system, as the switching of capacitor group; Slight switch activity or load variations near the inherent instrument of distribution system; The resonant circuit relevant with switching device is as controllable silicon; The various system failures are as to the short circuit of equipment winding ground system and arc fault etc.The principle that thunder and lightning produces surge voltage is as follows: direct stroke is in external circuit, and the big electric current of injection flows through earth resistance or external circuit impedance and produces voltage; Indirect stroke can induce voltage and current on the building inner and outer conductor; The common ground path that the thunder and lightning earth current that near directly thunder discharges over the ground is coupled to equipment winding ground system.When lightning arrester moved, rapid variation may take place in voltage and current, and may be coupled to internal circuit.These directly inject or the voltage or the electric current that are coupled to device interior not only can make device damage, and adjacent equipment even whole system all might be affected.
Though gas discharge tube is different with the Transient Suppression Diode operation principle, and similar voltage-current characteristic is arranged, and is very little by electric current when promptly both end voltage is lower than assigned voltage, and after both end voltage is higher than assigned voltage, can be index law by electric current and increases.This voltage-current characteristic makes it can satisfy the requirement that surge suppresses cascading water and amplitude limit simultaneously, and therefore, gas discharge tube and Transient Suppression Diode often are used to suppress interference signals such as surging signal, electrical fast transient (eft).
Gas discharge tube
Gas discharge tube can be used for aspects such as data wire, cable TV, AC power, telephone system and carry out surge protection, and general device voltage scope is from 75~10000V, and shock-resistant peak current 20000A can bear the discharge up to several kJ (kilojoule)s.
The major parameter of gas discharge tube comprises:
1) reaction time refers to surpass puncture voltage to the time that produces punch-through from applied voltage, and the gas discharge tube reaction time is generally in μ s numbers of poles.
2) power capacity refers to the ceiling capacity that gas discharge tube can bear and distributes, and it is defined as under 8 * 20 fixing μ s current waveforms, the electric current that can bear and distribute.
3) capacitance refers to the gas discharge tube two interpolar capacitances that record under specific 1MHz frequency.The gas discharge tube capacitance is very little, is generally≤1pF.
4) dc breakdown voltage is when the speed rising of applied voltage with 500V/s, and the voltage when discharge tube produces spark is puncture voltage.Gas discharge tube has the dc breakdown voltage of multiple different size, and its value depends on factors such as the kind of gas and interelectrode distance.
5) its operating temperature range of temperature range is generally between-55 ℃~+ 125 ℃.
The advantage of gas discharge tube is that the through-current capacity capacity is big, the insulation resistance height, and leakage current is little; Its shortcoming is, residual voltage is higher, the reaction time slow (≤100ns), the operation voltage precision is lower, and follow current (afterflow) is arranged.
Transient Suppression Diode (TVS)
Also claiming Zener diode, is that a kind of being specifically designed to suppressed superpotential device.Its core is the PN junction with larger sectional area, when this PN junction is operated in avalanche condition, has stronger pulse absorbability.
The advantage of Transient Suppression Diode is that residual voltage is low, the operation precision height, the reaction time fast (<1ns), no follow current (afterflow); Its shortcoming is that flow-resistant capacity is poor, and discharge capacity is little, generally has only the hundreds of ampere.
Inventor of the present utility model thinks, realizes that the high emphasis that inserts loss, the passive electromagnetic interface filter of small size is, the correct progression of selecting core material and built-up circuit under the prerequisite of limited bulk and rated power.Therefore, according to an embodiment of the present utility model, filtration module is as DC wave filter, it comprises gas discharge tube, Transient Suppression Diode and one-level filter circuit, wherein, gas discharge tube and Transient Suppression Diode are combined to form spike, surge restraint circuit, and further can realize simultaneously suppressing the inhibition of spike, surge interference and conducted interference with combining of one-level filter circuit.
Fig. 3 illustrates the circuit theory diagrams according to the filtration module of an embodiment of the present utility model.As shown in the figure, spike, the surge restraint circuit of gas discharge tube and Transient Suppression Diode combination adopted in the circuit left side.Because Transient Suppression Diode reaction is fast but through-current capacity is little, the gas discharge tube through-current capacity is big but reflection is slow and the higher characteristics of residual voltage, both is used in combination can eliminates the other side's shortcoming mutually, reaches spike, surge restraint circuit reaches designing requirement.The circuit right-hand part adopts π type filter circuit, can effectively suppress common mode disturbances, meets GJB 151A requirement.And as seen, this filtration module has made up the function of anti-electromagnetic interference and electromagnetic susceptibility (EMS), have surge and spike suppression characteristic, can use the military equipment of this filtration module or civil equipment to satisfy standard requirements such as GJB151A-97:CE102, CE107, CS106 and GJB1389A.
Among Fig. 3, V1 represents gas discharge tube, and La represents first inductance (for example differential mode inductance), Lb represents second inductance (for example differential mode inductance), V2 represents Transient Suppression Diode, and C1 represents first electric capacity (for example patch capacitor), and C2 represents second electric capacity (for example patch capacitor).
Particularly, first end of described gas discharge tube V1 is connected with first end of the described first inductance L a; Second end of the described first inductance L a all links to each other with first end of first end of described Transient Suppression Diode V2, described first capacitor C 1 and first end of the described second inductance L b; Second end of the described second inductance L b is connected with first end of described second capacitor C 2; Second end of second end of described gas discharge tube V1, second end of described Transient Suppression Diode V2, described first capacitor C 1 is connected with second end of described second capacitor C 2, and all is connected to ground; Described first end of described gas discharge tube V1 and first end of described second capacitor C 2 are connected to load.
The operating temperature range of this filtration module is-55 ℃~+ 105 ℃/-85 ℃~+ 125 ℃, and its rated voltage is 28/VDC, and rated current is 3A, decays when 500KHz, 40dB and 1MHz, 50dB.
Fig. 4 illustrates the insertion damage curve according to the EMI/EMS combination function DC power supply filtration module of the utility model embodiment.Because two phase lines of filtration module circuit just are being respectively and ground, have only common mode to insert loss so insert loss, no differential mode inserts loss.
Surge suppression characteristic according to the filtration module of embodiment of the present utility model is as follows: maximum line current: 3A; maximum line voltage: 28VDC; leakage current (during rated voltage):<0.1mA; nominal discharge current (8/20 μ s; 10times): 10KA, maximum discharge current (8/20 μ s, 1times): 20KA; working temperature :-25 ℃-+85 ℃, protector lost efficacy: short circuit.
In addition, implement this filtration module in order to help those skilled in the art, Fig. 5 illustrates the schematic diagram of the shell sizes of the DC power supply filtration module with EMI/EMS combination function.
Though disclose exemplary embodiment at this, adopted particular term, and concrete components and parts title and size, use these terms and concrete components and parts title and size only to be used for illustrative purposes and to describe purpose, rather than the purpose that is used to limit.Therefore, it will be understood by those skilled in the art that under the situation that does not deviate from the spirit and scope of the present invention that limit as appended claims, can carry out various changes in form and details.

Claims (1)

1. filtration module with anti-electromagnetic interference and transition inhibit feature comprises:
Gas discharge tube (V1), first inductance (La), Transient Suppression Diode (V2), second inductance (Lb), first electric capacity (C1) and second electric capacity (C2); Wherein,
First end of described gas discharge tube (V1) is connected with first end of described first inductance (La); Second end of described first inductance (La) all links to each other with first end of described Transient Suppression Diode (V2), first end of described first electric capacity (C1) and first end of described second inductance (Lb); Second end of described second inductance (Lb) is connected with first end of described second electric capacity (C2); Second end of second end of second end of described gas discharge tube (V1), described Transient Suppression Diode (V2), described first electric capacity (C1) is connected with second end of described second electric capacity (C2), and equal ground connection; Described first end of described gas discharge tube (V1) and first end of described second electric capacity (C2) are connected to load.
CN2009202783388U 2009-12-25 2009-12-25 Filter module with electromagnetic interference resistance and transient suppression functions Expired - Fee Related CN201663544U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102751926A (en) * 2012-07-31 2012-10-24 江苏浩峰汽车附件有限公司 Controller of brushless DC (direct current) motor for vehicle
CN104022497A (en) * 2014-05-27 2014-09-03 华为技术有限公司 Protective circuit and electronic equipment
CN104124675A (en) * 2013-04-26 2014-10-29 倍加福有限责任公司 Excess voltage protection apparatus and diagnostic method for multi-stage excess voltage protection apparatuses
CN105591576A (en) * 2014-10-23 2016-05-18 力山工业股份有限公司 Motor control circuit capable of suppressing interference signals
CN109444599A (en) * 2018-12-06 2019-03-08 郑州云海信息技术有限公司 A kind of system and method for eliminating electrical fast transient (eft) interference
CN111432519A (en) * 2020-04-20 2020-07-17 宁波市富来电子科技有限公司 Vehicle light subassembly integrated control system
CN111511059A (en) * 2020-04-21 2020-08-07 宁波市富来电子科技有限公司 Vehicle lamp control system for combined headlamp function

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102751926A (en) * 2012-07-31 2012-10-24 江苏浩峰汽车附件有限公司 Controller of brushless DC (direct current) motor for vehicle
CN102751926B (en) * 2012-07-31 2014-11-05 江苏浩峰汽车附件有限公司 Controller of brushless DC (direct current) motor for vehicle
CN104124675A (en) * 2013-04-26 2014-10-29 倍加福有限责任公司 Excess voltage protection apparatus and diagnostic method for multi-stage excess voltage protection apparatuses
CN104124675B (en) * 2013-04-26 2018-03-02 倍加福有限责任公司 Overvoltage protection and the diagnostic method for multistage overvoltage protection
CN104022497A (en) * 2014-05-27 2014-09-03 华为技术有限公司 Protective circuit and electronic equipment
CN105591576A (en) * 2014-10-23 2016-05-18 力山工业股份有限公司 Motor control circuit capable of suppressing interference signals
CN109444599A (en) * 2018-12-06 2019-03-08 郑州云海信息技术有限公司 A kind of system and method for eliminating electrical fast transient (eft) interference
CN111432519A (en) * 2020-04-20 2020-07-17 宁波市富来电子科技有限公司 Vehicle light subassembly integrated control system
CN111511059A (en) * 2020-04-21 2020-08-07 宁波市富来电子科技有限公司 Vehicle lamp control system for combined headlamp function
CN111511059B (en) * 2020-04-21 2022-07-01 宁波市富来电子科技有限公司 Vehicle lamp control system for combined headlamp function

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