CN104218557B - A kind of lightning protection circuit - Google Patents
A kind of lightning protection circuit Download PDFInfo
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- CN104218557B CN104218557B CN201310207449.0A CN201310207449A CN104218557B CN 104218557 B CN104218557 B CN 104218557B CN 201310207449 A CN201310207449 A CN 201310207449A CN 104218557 B CN104218557 B CN 104218557B
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Abstract
The invention belongs to anti-thunder technical field, there is provided a kind of lightning protection circuit.The lightning protection circuit is connected in the supply line by protection equipment thunder and lightning absorption and isolation circuit; thunder and lightning absorption and isolation circuit include the thunder and lightning absorbing circuit absorbed to lightning current and the thunder and lightning isolation circuit of frequency-selective filtering are carried out to the electric current passed through; the transmission of lightning current is prevented to cause power frequency component or carrier signal to be able to by, lightning protection effect is served.Relative to prior art, the lightning protection circuit is no longer dependent on grounded screen resistance with distributing the shunt ratio of lightning current by the characteristic impedance ratio of protection equipment, and lightning protection effect is good.In addition; the first surge protection circuit and the second surge protection circuit can also be increased further to strengthen lightning protection effect; and the requirement to grounded screen resistance can be greatly reduced; i other words; the grounded screen with very big resistance can be used; so as to significantly reduce the construction cost of grounded screen, the construction period is shortened.
Description
Technical field
The invention belongs to anti-thunder technical field, more particularly to a kind of lightning protection circuit.
Background technology
Lightning Disaster is one kind in the natural calamity of ten kinds of most serious of international publication.Annual Lightning Disaster accident frequency
It is numerous, involve a wide range of knowledge, the security of the lives and property to broad masses of the people constitutes a serious threat.Particularly sent out rapidly in microelectric technique
Today of exhibition, lightning discharge not only makes lightning strike spot building and equipment wreck, and because thunderbolt energy is with electromagnetism amplitude
The form penetrated with line propagation is to all the winds spread rapidly, and neighbouring numerous electronic equipment or transmission line of electricity can be made to meet with simultaneously
To destruction, therefore, it is the primary goal to be realized of Modern Lightning Protection Technology to reduce Lightning Disaster.
Therefore, prior art provides a kind of lightning protection circuit, it includes being connected in parallel on by the surge protection at protection equipment two ends
Device and a grounded screen.Because Surge Protector has the characteristic of over-pressed instantaneous short-circuit, thunder-strike current is produced in generation thunderbolt
When, thunder-strike current is incorporated into grounded screen by the lightning-protection system using Surge Protector, so as to realize that the neutralization of thunderbolt electric charge disappears
Dissipate, that is, will be by protection equipment short circuit, to play to by the passive protection effect of protection equipment.
In the lightning protection circuit that prior art is provided, grounded screen resistance value is the smaller the better, and theoretic optimal value is 0
Ohm.However, actual grounded screen resistance influenceed by factors such as ground mat construction environment and construction costs and can not
0 ohm can be accomplished.For example, it is necessary to build very big very deep grounding body, expend very many steel and copper in terms of construction cost
Material, use a large amount of great pollutions and corrosive friction reducer etc.；In terms of built environment, high mountain, rock, gravel, salt-soda soil, dagger-axe
The geological environments such as wall govern the construction of earth work.Therefore, the grounded screen resistance standard currently for lightning-protection system is set to 10
Ohm.And because grounded screen resistance can not realize 0 ohm, then Surge Protector can not to be short-circuited completely by protection equipment,
Then some inevitable thunder-strike current can be flowed through by protection equipment, and whether is damaged by protection equipment, placed one's entire reliance upon and protected
Protect the tolerance of equipment itself.Therefore, the lightning protection effect for the lightning protection circuit that prior art is provided is poor, causes to use lightning protection in this
Circuit is still had higher broken by lightning rate by protection equipment.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of lightning protection circuit, it is intended to solve the lightning protection circuit of prior art offer
Because Surge Protector will can not be completely short-circuited by protection equipment so that a part for thunder-strike current is flowed through by protection equipment,
Lightning protection effect difference the problem of.
The embodiment of the present invention is achieved in that a kind of lightning protection circuit, and the lightning protection circuit includes：
Thunder and lightning absorbs and isolation circuit, and the thunder and lightning absorbs is connected external power source/signal source with the input of isolation circuit,
The thunder and lightning absorbs to be connected by protection equipment with the output end of isolation circuit, and the thunder and lightning absorbs to be used to absorb institute with isolation circuit
The part lightning current in the output current of external power source/signal source is stated, and the output current of the external power source/signal source is entered
Row frequency-selective filtering, afterwards exports power current or carrier signal to described by protection equipment.
Lightning protection circuit proposed by the present invention is that series connection thunder and lightning absorbs and isolation circuit in the supply line by protection equipment,
The thunder and lightning absorbs with isolation circuit including the thunder and lightning absorbing circuit that is absorbed to lightning current and the electric current passed through is selected
The thunder and lightning isolation circuit of frequency filtering, the transmission of lightning current is prevented to cause power frequency component or carrier signal to be able to by, is played
Lightning protection effect.Relative to prior art, the lightning protection circuit is no longer dependent on grounded screen resistance with being hindered by the characteristic of protection equipment
Anti- ratio distributes the shunt ratio of lightning current, and lightning protection effect is good.
Brief description of the drawings
Fig. 1 is the lightning protection circuit and external power source/signal source and the connection by protection equipment that the embodiment of the present invention one is provided
Schematic diagram；
Fig. 2 be Fig. 1 in, thunder and lightning absorb a kind of circuit theory diagrams with isolation circuit；
Fig. 3 be Fig. 1 in, thunder and lightning absorb another circuit theory diagrams with isolation circuit
Fig. 4 be Fig. 2 and Fig. 3 in, the circuit diagram of thunder and lightning absorbing circuit；
Fig. 5 be Fig. 2 and Fig. 3 in, the circuit diagram of thunder and lightning isolation circuit；
Fig. 6 is the lightning protection circuit and external power source/signal source and the connection by protection equipment that the embodiment of the present invention two is provided
Schematic diagram；
Fig. 7 be Fig. 6 in, the circuit diagram of the first surge protection circuit；
The lightning protection circuit that Fig. 8 embodiment of the present invention three is provided shows with external power source/signal source and by the connection of protection equipment
It is intended to；
Fig. 9 be Fig. 8 in, the circuit diagram of the second surge protection circuit.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The problem of existing for existing lightning protection circuit, lightning protection circuit proposed by the present invention is by the supply lines of protection equipment
Thunder and lightning of being connected on road absorbs and isolation circuit, and the thunder and lightning absorbs the thunder and lightning for including absorbing lightning current with isolation circuit and absorbed
Circuit and the thunder and lightning isolation circuit that frequency-selective filtering is carried out to the electric current passed through.This hair is described in detail below with reference to embodiment
Bright implementation：
Embodiment one
The embodiment of the present invention one proposes a kind of lightning protection circuit, as shown in figure 1, connecting external power source/letter including input
Number source, output end connection are absorbed and isolation circuit 11, the output for absorbing external power source/signal source by the thunder and lightning of protection equipment
Part lightning current in electric current, and frequency-selective filtering is carried out to the output current of external power source/signal source, afterwards by power current or
Carrier signal is exported to by protection equipment.
In one case, as shown in Fig. 2 thunder and lightning absorption includes with isolation circuit 11：Thunder and lightning absorbing circuit 111, thunder and lightning
The input of absorbing circuit 111 absorbs the input with isolation circuit 11 as thunder and lightning, for absorbing external power source/signal source
Lightning current surge in the surge energy of part lightning current in output current, the output current to eliminate external power source/signal source
Crest energy；Thunder and lightning isolation circuit 112, the output end of the input connection thunder and lightning absorbing circuit 111 of thunder and lightning isolation circuit 112,
The output end of thunder and lightning isolation circuit 112 absorbs the output end with isolation circuit 11 as thunder and lightning, for thunder and lightning absorbing circuit 111
The electric current of output carries out frequency-selective filtering, is set with preventing lightning current from being exported by and by power current or carrier signal to by protection
It is standby.
In another case, as shown in figure 3, thunder and lightning absorption includes with isolation circuit 11：Thunder and lightning isolation circuit 112, thunder
The input of electric isolating circuit 112 absorbs the input with isolation circuit 11 as thunder and lightning, for external power source/signal source
Output current carries out frequency-selective filtering, with prevent lightning current by and export power current or carrier signal；Thunder and lightning absorbing circuit
111, the output end of the input connection thunder and lightning isolation circuit 112 of thunder and lightning absorbing circuit 111, the output of thunder and lightning absorbing circuit 111
Hold lightning current in the output end as thunder and lightning absorption and isolation circuit 11, the electric current for absorbing the output of thunder and lightning isolation circuit 112
Surge energy, and power current or carrier signal are exported to by protection equipment.
Fig. 4 is shown in Fig. 2 and Fig. 3, the circuit of thunder and lightning absorbing circuit 111.
In detail, thunder and lightning absorbing circuit 111 can include：Common mode inductance L1, electric capacity Cx1, electric capacity Cx2.Wherein, common mode electricity
L1 first input end A1 and the second input A2 are felt as the input of thunder and lightning absorbing circuit 111, the first of common mode inductance L1
Output end B1 and the second output end B2 as thunder and lightning absorbing circuit 111 output end；Electric capacity Cx1 is connected in parallel on the of common mode inductance L1
Between one input A1 and the second input A2, electric capacity Cx2 is connected in parallel on the common mode inductance L1 outputs of the first output end B1 and second
Between the B2 of end.
In the embodiment of the present invention one, electric capacity Cx1 and/or electric capacity Cx2 both can be the independent capacitance devices for being resistant to high pressure,
It can be the parasitic capacitance that common mode inductance L1 is produced.
Found according to research, lightning current energy frequency spectrum is distributed as high frequency, and its energy is concentrated mainly on 100Hz~100KHz,
The frequency band energy accounts for more than the 95% of gross energy, the energy of wherein more than 1KHz frequency bands accounts for 76%, and the neighbouring 0~100Hz of power frequency
Energy only accounts for 2.3%.Therefore, in the embodiment of the present invention one, thunder and lightning absorbing circuit 111 is specifically the frequency band in 1KHz~100KHz
Upper absorption of the realization to thunder and lightning stream energy, its operation principle is：When lightning current with surge pulse flows through thunder and lightning absorbing circuit 111
When, because electric capacity Cx1, electric capacity Cx2 and common mode inductance L1 are energy-storage travelling wave tube, thus absorption part lightning current surge can be played
The effect of energy.
Fig. 5 is shown in Fig. 2 and Fig. 3, the circuit of thunder and lightning isolation circuit 112.
In detail, thunder and lightning isolation circuit 112 can include：Differential mode inductance L2, differential mode inductance L3, impedance R1, impedance R2, electricity
Hold Cx3, electric capacity Cx4.Wherein, differential mode inductance L2 first end C1 and differential mode inductance L3 first end C2 isolate collectively as thunder and lightning
The input of circuit 12, differential mode inductance L2 the second end connection impedance R1 first end, differential mode inductance L3 the second end connection resistance
Anti- R2 first end, the output of impedance R1 the second end D1 and impedance R2 the second end D2 collectively as thunder and lightning isolation circuit 112
End；Impedance R1 the second end is grounded by electric capacity Cx3, and impedance R2 the second end is grounded by electric capacity Cx4.
In the embodiment of the present invention one, electric capacity Cx3 both can be the independent capacitance device or differential mode electricity for being resistant to high pressure
Feel the parasitic capacitance that L2 is produced, electric capacity Cx4 both can be independent capacitance device or the differential mode inductance L3 productions for being resistant to high pressure
Raw parasitic capacitance.The spurious impedance that the individual impedance device or differential mode inductance L2 that impedance R1 both can be are produced, resistance
The spurious impedance that the individual impedance device or differential mode inductance L3 that anti-R2 both can be are produced.
In the embodiment of the present invention one, thunder and lightning isolation circuit 112 is specifically to be realized on 1KHz~100KHz frequency band to thunder
The isolation of electric current.After thunder and lightning isolation circuit 112 is combined with thunder and lightning absorbing circuit 111, can guarantee that 0~100Hz frequency band and
Only a small amount of decay in 500KHz~10GHz frequency band, half is that have 0.1dB~0.5dB's in 0~100Hz frequency band
, there is 0.1dB~0.3dB decay in 500KHz~10GHz frequency band in decay.Because the frequency band of most carrier signals is
1MHz~10GHz, hereby it is ensured that power current and the lossless of carrier signal pass through.
In the embodiment of the present invention one, thunder and lightning isolation circuit 112 is a frequency selection circuit, and its operation principle is：When electric current flows through
During thunder and lightning isolation circuit 112, acted on by frequency-selecting so that power current frequency band and carrier signal frequency band is without hindrance passes through, and
Transient state high impedance is formed in lightning current frequency band, so as to block the transmission of lightning current.
The embodiment of the present invention one propose lightning protection circuit be in the supply line by protection equipment connect thunder and lightning absorb with
Isolation circuit, the thunder and lightning absorbs includes the thunder and lightning absorbing circuit that is absorbed to lightning current and to passing through with isolation circuit
Electric current carries out the thunder and lightning isolation circuit of frequency-selective filtering, and lightning current is prevented to cause power frequency component or carrier signal to be able to by
Transmission, serves lightning protection effect.Relative to prior art, the lightning protection circuit is no longer dependent on grounded screen resistance and by protection equipment
Characteristic impedance ratio distribute the shunt ratio of lightning current, lightning protection effect is good.
Embodiment two
The embodiment of the present invention two proposes a kind of lightning protection circuit, as shown in Figure 6.It is different from shown in embodiment one, implementing
In example two, lightning protection circuit also includes：First surge protection circuit 12, the first surge protection circuit 12 is arranged on external power source/letter
Number source and thunder and lightning are absorbed between isolation circuit 11, and the input of the first surge protection circuit 12 is connected to and supplied by protection equipment
In electric line, in the output current for providing external power source/signal source, the path of releasing of part lightning current.
Further, when external power source/signal source is single phase poaer supply, as shown in fig. 7, the first surge protection circuit 12 can
With including：Piezo-resistance RV1 and discharge tube G1.Wherein, piezo-resistance RV1 two ends are connected in parallel on the fire of external power source/signal source
Between line and zero line, discharge tube G1 one end connection zero line, discharge tube G1 other end ground connection.
Now, the operation principle of lightning protection circuit is：Part lightning current in the electric current of external power source/signal source output is first
Ground is entered by the first surge protection circuit 12, the lightning current of remainder enters thunder and lightning absorption and the isolation circuit 11 of rear class.By
The effect with isolation circuit 11 is absorbed in thunder and lightning so that the fast conducting of the first surge protection circuit 12, extend the first surge guarantor
Protection circuit 12 is released the time, thus more thunder and lightning stream energies that can release.
Relative to embodiment one, embodiment two is absorbed with before isolation circuit 11, also add the first surge guarantor in thunder and lightning
Protection circuit 12, further enhances the effect of lightning protection.
Embodiment three
The embodiment of the present invention three proposes a kind of lightning protection circuit, as shown in Figure 8.It is different from shown in embodiment two, implementing
In example three, lightning protection circuit also includes：Second surge protection circuit 13, the second surge protection circuit 13 be arranged on thunder and lightning absorb with every
From circuit 11 and by between protection equipment, and the input of the second surge protection circuit 13 is connected to by protection equipment supply line
On, absorbed for providing thunder and lightning in the electric current exported with isolation circuit 11, the path of releasing of remaining lightning current.
Further, when external power source/signal source is single phase poaer supply, as shown in figure 9, the second surge protection circuit 13 can
With including：Piezo-resistance RV2 and discharge tube G2.Wherein, piezo-resistance RV2 two ends are connected in parallel on thunder and lightning and absorbed and isolation circuit 11
Two output ends between, discharge tube G2 one end connection zero line, discharge tube G2 other end ground connection.
Have passed through the first surge protection circuit 12 and thunder and lightning absorb with after isolation circuit 11, although reduced 98% with
On lightning current, but close to power frequency frequency band one part of current energy be still possible on a small quantity presence, therefore increase the second surge
Protection circuit 13 is released to remaining lightning current.Relative to embodiment two, lightning protection effect is further enhancing, effectively protection
By impact of the protection equipment from lightning current.
In summary, lightning protection circuit proposed by the present invention be in the supply line by protection equipment connect thunder and lightning absorb with
Isolation circuit, the thunder and lightning absorbs includes the thunder and lightning absorbing circuit that is absorbed to lightning current and to passing through with isolation circuit
Electric current carries out the thunder and lightning isolation circuit of frequency-selective filtering, and lightning current is prevented to cause power frequency component or carrier signal to be able to by
Transmission, serves lightning protection effect.Relative to prior art, the lightning protection circuit is no longer dependent on grounded screen resistance and by protection equipment
Characteristic impedance ratio distribute the shunt ratio of lightning current, lightning protection effect is good.In addition, can increase by the first surge protection circuit 12
Further strengthen lightning protection effect with the second surge protection circuit 13, and the requirement to grounded screen resistance can be greatly reduced, be
Say, the grounded screen with very big resistance can be used, so as to significantly reduce the construction cost of grounded screen, shorten construction week
Phase.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of lightning protection circuit, including thunder and lightning absorb and isolation circuit（11）, the thunder and lightning absorbs and isolation circuit（11）It is defeated
Enter end connection external power source/signal source, the thunder and lightning absorbs and isolation circuit（11）Output end connect by protection equipment, it is described
Thunder and lightning absorbs and isolation circuit（11）The part lightning current in output current for absorbing the external power source/signal source, and
Output current to the external power source/signal source carries out frequency-selective filtering, afterwards exports power current or carrier signal to institute
State by protection equipment；
Characterized in that, the thunder and lightning absorbs and isolation circuit（11）Including：
Thunder and lightning absorbing circuit（111）, the thunder and lightning absorbing circuit（111）Input absorbed as the thunder and lightning and isolation circuit
（11）Input, the thunder and lightning absorbing circuit（111）Part in output current for absorbing the external power source/signal source
The surge energy of lightning current；
The thunder and lightning absorbing circuit includes common mode inductance L1, electric capacity Cx1, electric capacity Cx2, the first input end of the common mode inductance L1
With input of second input as the thunder and lightning absorbing circuit, the first output end of the common mode inductance L1 and the second output
End is used as the thunder and lightning absorbing circuit（111）Output end；The electric capacity Cx1 is connected in parallel on the first input of the common mode inductance L1
End the second input between, the electric capacity Cx2 be connected in parallel on the common mode inductance L1 the first output end and the second output end it
Between；
Thunder and lightning isolation circuit（112）, the thunder and lightning isolation circuit（112）Input connect the thunder and lightning absorbing circuit（111）
Output end, the thunder and lightning isolation circuit（112）Output end absorbed as the thunder and lightning and isolation circuit（11）Output end,
The thunder and lightning isolation circuit（112）For to passing through the thunder and lightning absorbing circuit（111）The electric current of output carries out frequency-selective filtering, with
Lightning current is prevented to be exported by and by power current or carrier signal to described by protection equipment；
The thunder and lightning isolation circuit includes differential mode inductance L2, differential mode inductance L3, impedance R1, impedance R2, electric capacity Cx3, electric capacity Cx4,
The first end of the differential mode inductance L2 and the first end of the differential mode inductance L3 are collectively as the thunder and lightning isolation circuit（112）'s
Input, the second end of the differential mode inductance L2 connects the first end of the impedance R1, and the second end of the differential mode inductance L3 connects
Connect the first end of the impedance R2, the second end of the impedance R1 and the impedance R2 the second end collectively as the thunder and lightning every
From the output end of circuit；The second end of the impedance R1 is grounded by the electric capacity Cx3, and the second end of the impedance R2 passes through institute
State electric capacity Cx4 ground connection；
Thunder and lightning isolation circuit（112）The isolation to lightning current is realized on 1KHz~100KHz frequency band；Thunder and lightning isolation circuit
（112）With thunder and lightning absorbing circuit（111）With reference to rear, it can guarantee that in 0~100Hz frequency band and 500KHz~10GHz frequency band
, there is 0.1dB~0.5dB decay in 0~100Hz frequency band, in 500KHz~10GHz frequency band in only a small amount of decay
There is 0.1dB~0.3dB decay；Because the frequency band of most carrier signals is 1MHz~10GHz, hereby it is ensured that power current
Lossless with carrier signal passes through.
2. a kind of lightning protection circuit, including thunder and lightning absorb and isolation circuit（11）, the thunder and lightning absorbs and isolation circuit（11）It is defeated
Enter end connection external power source/signal source, the thunder and lightning absorbs and isolation circuit（11）Output end connect by protection equipment, it is described
Thunder and lightning absorbs and isolation circuit（11）The part lightning current in output current for absorbing the external power source/signal source, and
Output current to the external power source/signal source carries out frequency-selective filtering, afterwards exports power current or carrier signal to institute
State by protection equipment；
Characterized in that, the thunder and lightning absorbs and isolation circuit（11）Including：
Thunder and lightning isolation circuit（112）, the thunder and lightning isolation circuit（112）Input absorbed as the thunder and lightning and isolation circuit
（11）Input, the thunder and lightning isolation circuit（112）Frequency-selecting filter is carried out for the output current to external power source/signal source
Ripple, with prevent lightning current by and export power current or carrier signal；
The thunder and lightning isolation circuit includes differential mode inductance L2, differential mode inductance L3, impedance R1, impedance R2, electric capacity Cx3, electric capacity Cx4 institutes
Differential mode inductance L2 first end and the first end of the differential mode inductance L3 are stated collectively as the thunder and lightning isolation circuit（112）It is defeated
Enter end, the second end of the differential mode inductance L2 connects the first end of the impedance R1, the second end connection of the differential mode inductance L3
The first end of the impedance R2, the second end of the impedance R1 and the impedance R2 the second end isolate collectively as the thunder and lightning
The output end of circuit；The second end of the impedance R1 is grounded by the electric capacity Cx3, and the second end of the impedance R2 passes through described
Electric capacity Cx4 is grounded；
Thunder and lightning absorbing circuit（111）, the thunder and lightning absorbing circuit（111）Input connect the thunder and lightning isolation circuit（112）
Output end, the thunder and lightning absorbing circuit（111）Output end absorbed as the thunder and lightning and isolation circuit（11）Output end,
The thunder and lightning absorbing circuit（111）For absorbing the thunder and lightning isolation circuit（112）The surge energy of lightning current in the electric current of output
Amount, and the power current or the carrier signal are exported to described by protection equipment；
The thunder and lightning absorbing circuit includes common mode inductance L1, electric capacity Cx1, electric capacity Cx2, the first input end of the common mode inductance L1
With input of second input as the thunder and lightning absorbing circuit, the first output end of the common mode inductance L1 and the second output
End is used as the thunder and lightning absorbing circuit（111）Output end；The electric capacity Cx1 is connected in parallel on the first input of the common mode inductance L1
End the second input between, the electric capacity Cx2 be connected in parallel on the common mode inductance L1 the first output end and the second output end it
Between；
Thunder and lightning isolation circuit（112）The isolation to lightning current is realized on 1KHz~100KHz frequency band；Thunder and lightning isolation circuit
（112）With thunder and lightning absorbing circuit（111）With reference to rear, it can guarantee that in 0~100Hz frequency band and 500KHz~10GHz frequency band
, there is 0.1dB~0.5dB decay in 0~100Hz frequency band, in 500KHz~10GHz frequency band in only a small amount of decay
There is 0.1dB~0.3dB decay；Because the frequency band of most carrier signals is 1MHz~10GHz, hereby it is ensured that power current
Lossless with carrier signal passes through.
3. lightning protection circuit as claimed in claim 1 or 2, it is characterised in that the electric capacity Cx1 and/or electric capacity Cx2 are described common
Parasitic capacitance or independent capacitance device that mould inductance L1 is produced.
4. lightning protection circuit as claimed in claim 1 or 2, it is characterised in that the electric capacity Cx3 is that the differential mode inductance L2 is produced
Parasitic capacitance or independent capacitance device, the electric capacity Cx4 is the parasitic capacitance or independent capacitance that the differential mode inductance L3 is produced
Device；
The impedance R1 is the spurious impedance or individual impedance device that the differential mode inductance L2 is produced, and the impedance R2 is the difference
Spurious impedance or individual impedance device that mould inductance L3 is produced.
5. lightning protection circuit as claimed in claim 1, it is characterised in that the lightning protection circuit also includes：
First surge protection circuit（12）, first surge protection circuit（12）Be arranged on the external power source/signal source and
The thunder and lightning absorbs and isolation circuit（11）Between, and first surge protection circuit（12）Input be connected to the quilt
In protection equipment supply line, first surge protection circuit（12）Output for providing the external power source/signal source
The path of releasing of part lightning current in electric current.
6. lightning protection circuit as claimed in claim 5, it is characterised in that the lightning protection circuit also includes：
Second surge protection circuit（13）, second surge protection circuit（13）The thunder and lightning is arranged on to absorb and isolation circuit
（11）And it is described by between protection equipment, and second surge protection circuit（13）Input be connected to and described set by protection
In available electric line, the second surge protection circuit（13）Absorbed and isolation circuit for providing the thunder and lightning（11）The electric current of output
In, the path of releasing of remaining lightning current.
7. lightning protection circuit as claimed in claim 6, it is characterised in that the external power source/signal source is single phase poaer supply, described
First surge protection circuit（12）Including：Piezo-resistance RV1 and discharge tube G1, the two ends of the piezo-resistance RV1 are connected in parallel on institute
Between the live wire and zero line of stating external power source/signal source, one end of the discharge tube G1 connects the zero line, the discharge tube G1
The other end ground connection；
Second surge protection circuit（13）Including：Piezo-resistance RV2 and discharge tube G2, the two ends of the piezo-resistance RV2
It is connected in parallel on the thunder and lightning to absorb between two output ends of isolation circuit, one end connection zero line of the discharge tube G2 is described
Discharge tube G2 other end ground connection；
Part lightning current in the electric current of external power source/signal source output passes through the first surge protection circuit first（12）Enter ground,
The thunder and lightning that the lightning current of remainder enters rear class absorbs and isolation circuit（11）；Because thunder and lightning absorbs and isolation circuit（11）'s
Effect so that the first surge protection circuit（12）Fast conducting, extends the first surge protection circuit（12）Release the time, because
And more thunder and lightning stream energies that can release；
It has passed through the first surge protection circuit（12）Absorbed with thunder and lightning and isolation circuit（11）Afterwards, although reduced 98% with
On lightning current, but close to power frequency frequency band one part of current energy be still possible on a small quantity presence, therefore increase the second surge
Protection circuit（13）Remaining lightning current is released.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310207449.0A CN104218557B (en) | 2013-05-29 | 2013-05-29 | A kind of lightning protection circuit |
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|---|---|---|---|
| CN201310207449.0A CN104218557B (en) | 2013-05-29 | 2013-05-29 | A kind of lightning protection circuit |
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| CN104218557A CN104218557A (en) | 2014-12-17 |
| CN104218557B true CN104218557B (en) | 2017-09-19 |
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| CN110165647A (en) * | 2019-05-21 | 2019-08-23 | 北京计算机技术及应用研究所 | A kind of military computer interface strong electromagnetic pulse protection circuit |
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| CN2681423Y (en) * | 2003-12-17 | 2005-02-23 | 华为技术有限公司 | Lightning protection device |
| CN201138785Y (en) * | 2007-11-29 | 2008-10-22 | 上海美多通信设备有限公司 | Wave filter circuit for switch power supply |
| CN201238083Y (en) * | 2008-08-06 | 2009-05-13 | 四川九洲电器集团有限责任公司 | Power cord with power supply noise filter |
| CN201435604Y (en) * | 2009-01-05 | 2010-03-31 | 成都新欣神风电子科技有限公司 | Power supply wave filter |
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| EP2387137B1 (en) * | 2010-05-13 | 2013-07-17 | Nxp B.V. | An SMPS having a saftey arrangement, a method of operating a SMPS, and a controller therefor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2681423Y (en) * | 2003-12-17 | 2005-02-23 | 华为技术有限公司 | Lightning protection device |
| CN201138785Y (en) * | 2007-11-29 | 2008-10-22 | 上海美多通信设备有限公司 | Wave filter circuit for switch power supply |
| CN201238083Y (en) * | 2008-08-06 | 2009-05-13 | 四川九洲电器集团有限责任公司 | Power cord with power supply noise filter |
| CN201435604Y (en) * | 2009-01-05 | 2010-03-31 | 成都新欣神风电子科技有限公司 | Power supply wave filter |
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