CN109473958A - A kind of lightning protection circuit and electrical equipment - Google Patents
A kind of lightning protection circuit and electrical equipment Download PDFInfo
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- CN109473958A CN109473958A CN201710804896.2A CN201710804896A CN109473958A CN 109473958 A CN109473958 A CN 109473958A CN 201710804896 A CN201710804896 A CN 201710804896A CN 109473958 A CN109473958 A CN 109473958A
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- 208000025274 Lightning injury Diseases 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims abstract description 26
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- 230000015556 catabolic process Effects 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 8
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- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
The embodiment of the invention discloses a kind of lightning protection circuit and electrical equipments.Wherein, lightning protection circuit includes level-one discharge module, two-stage discharge module and three-level discharge module, wherein level-one discharge module, two-stage discharge module and three-level discharge module are sequentially connected in series between cable input terminal and the chip of electrical equipment；When the input cable of electrical equipment meets with lightning stroke; three-level repid discharge processing is done by the lightning stroke energy being passed to cable input terminal; and filtering processing and Out-of-band rejection processing are done to incoming cable signal; it is good to fast response time, the isolation of lightning stroke, protection effect is good and interference rejection ability is strong, improve the lightning strike protection ability and interference rejection ability of the electrical equipments such as set-top box, television set.
Description
Technical field
The present embodiments relate to anti-thunder technical field more particularly to a kind of lightning protection circuits and electrical equipment.
Background technique
With the development of information-intensive society, more and more families begin to use having for the standards such as DVB-S, DVB-T and DVB-C
Line cable top box of digital machine.
Cable is usually needed from outdoor drawing to interior, the exposed invasion that nature lightning stroke is often subject in outdoor cable,
Naturally the logical cable of the high-energy that lightning stroke generates imported into top box of digital machine, causes tuner (Tuner) chip of set-top box
It is directly broken with tuner (LNB, Low Noise Block) power driving control chip, causes top box of digital machine that must return
It repairs or changes planes, to give the technical support after sale of operator or device manufacturer and maintenance of top box of digital machine, bring heavy negative
Load and high maintenance cost.The anti-lightning and interference rejection ability for how improving top box of digital machine product are that industry is being studied always
But fail the problem captured always.
As shown in Figure 1, widespread practice is in the industry at present: defeated in the cable input terminal and tuner chip of top box of digital machine
Enter the isolation capacitance C1 that adds high pressure between end, to protect tuner chip；In cable input terminal and the tuner electricity of top box of digital machine
Source drive control chip input terminal coilloading L and filter capacitor C2, to protect tuner power driving control chip.Using this
The top box of digital machine of way, the voltage range of lightning protection are ± (1~2) KV, and out-of-band interference inhibits than being about -10dB, to lightning stroke
Response speed is slow, isolation is poor, degree of protection is low and protection effect is poor.
Summary of the invention
To solve Related Technical Issues, the embodiment of the present invention provides a kind of lightning protection circuit and electrical equipment, with elevator top
The lightning strike protection ability and interference rejection ability of the electrical equipments such as box, television set.
To achieve the above object, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, the embodiment of the invention provides a kind of lightning protection circuits, comprising: level-one discharge module, two-stage discharge mould
Block and three-level discharge module；
The level-one discharge module is connected with cable input terminal and the two-stage discharge module respectively, for accessing by institute
The incoming cable signal of cable input terminal and lightning stroke energy are stated, and discharges the lightning stroke energy, Xiang Suoshu two-stage discharge module is defeated
The cable signal and remaining lightning stroke energy out；
The two-stage discharge module is also connected with the three-level discharge module, for doing at filtering to the cable signal
Reason and Out-of-band rejection processing, and the lightning stroke energy of the remnants is discharged, Xiang Suoshu three-level discharge module exports the cable signal
With end lightning stroke energy；
The three-level discharge module, is also connected with the chip of electrical equipment, for being isolated and discharging the end lightning stroke energy
Amount transmits the cable signal to the chip of electrical equipment.
Preferably, the two-stage discharge module includes filter unit and two-stage discharge unit；
The filter unit is connected with the level-one discharge module and three-level discharge module respectively, for the cable
Signal does filtering processing and Out-of-band rejection processing, and Xiang Suoshu three-level discharge module exports the cable signal and end lightning stroke energy
Amount；
The two-stage discharge unit is connected, for discharging respectively with the level-one discharge module and three-level discharge module
Remaining lightning stroke energy is stated, Xiang Suoshu three-level discharge module exports end lightning stroke energy.
Preferably, the three-level discharge module includes three-level discharge cell and isolated location, and the chip includes tuner
Chip and tuner power driving control chip；
The three-level discharge cell, is connected with the filter unit and tuner chip respectively, for discharging the end
Be struck by lightning energy, and Xiang Suoshu tuner chip transmits the cable signal；
The isolated location is connected with the two-stage discharge unit and tuner power driving control chip respectively, is used for
Thunder-strike current is isolated, Xiang Suoshu tuner power driving control chip transmits the cable signal.
Preferably, the filter unit includes bandpass filter B, the two-stage discharge unit include magnetic oxysome inductance L1,
High frequency capacitance C and first diode D1；One end of the bandpass filter B is connected with the level-one discharge module, the other end with
The three-level discharge module is connected；One end of the magnetic oxysome inductance L1 is connected with the level-one discharge module, other end difference
It is connected with the cathode of one end of the high frequency capacitance C and the first diode D1, the other end ground connection of the high frequency capacitance, institute
State the plus earth of first diode D1.
Preferably, the upper limiting frequency of the bandpass filter B is 2.15GHz, lower frequency limit 950MHz；The magnetic oxysome
The inductance value range of inductance L1 is 100~400nH, quality factor q > 30；The capacitance of the high frequency capacitance C is 100pF；It is described
First diode D1 is Transient Suppression Diode, and the power of D1 is 3KW.
Preferably, the three-level discharge cell includes the second diode D2, and the isolated location includes third diode D3；
The cathode of the second diode D2 is connected with the filter unit and tuner chip respectively, plus earth；Described 3rd 2
The cathode of pole pipe D3 is connected with the two-stage discharge unit, positive to be connected with the tuner power driving control chip.
Preferably, the second diode D2 is Transient Suppression Diode, and the breakdown voltage of D2 is 5V；Three or two pole
The backward voltage of pipe D3 is 40V, forward current 2A.
Preferably, the level-one discharge module includes glass discharge vessel A；One end of the glass discharge vessel A respectively with electricity
Cable input terminal is connected with the two-stage discharge module, other end ground connection；The nominal shock pulse of the glass discharge vessel A, which bears voltage, to be held
Amount is 10/700us 6KV.
Second aspect, the embodiment of the invention provides a kind of electrical equipments, provide including any embodiment of the present invention anti-
Thunder and lightning road.
Preferably, the electrical equipment is set-top box or television set.
Technical solution bring provided in an embodiment of the present invention the utility model has the advantages that
It includes level-one discharge module, second level that the embodiment of the present invention, which provides a kind of lightning protection circuit and electrical equipment, lightning protection circuit,
Discharge module and three-level discharge module, wherein level-one discharge module, two-stage discharge module and three-level discharge module are sequentially connected in series
Between cable input terminal and the chip of electrical equipment, when cable meets with lightning stroke, cable input terminal is passed to cable signal and lightning stroke energy
Amount, level-one discharge module fast and stable absorb and discharge most lightning stroke energy, believe to two-stage discharge module output cable
Number and remaining lightning stroke energy, two-stage discharge module does filtering processing to cable signal and Out-of-band rejection is handled, and discharges remnants
Lightning stroke energy, be struck by lightning energy for Xiang Suoshu three-level discharge module output cable signal and end, and three-level discharge module is isolated and is released
End lightning stroke energy is put, to the chip transmission cable signal of electrical equipment；It is done by the lightning stroke energy being passed to cable input terminal
Three-level repid discharge processing, and filtering processing and Out-of-band rejection processing are done to incoming cable signal, to the response speed of lightning stroke
Degree is fast, isolation is good, protection effect is good and interference rejection ability is strong, improves the lightning strike protection of the electrical equipments such as set-top box, television set
Ability and interference rejection ability.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is a kind of schematic diagram of schemes of prevention against lightning of electrical equipment in the prior art；
Fig. 2 is the application scenarios schematic diagram of lightning protection circuit in the embodiment of the present invention；
Fig. 3 is a kind of frame diagram of lightning protection circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of frame diagram of lightning protection circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of electrical block diagram of lightning protection circuit provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of electrical equipment provided in an embodiment of the present invention.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
It is mentioned to promote lightning strike protection ability and interference rejection ability, the embodiment of the present invention of the electrical equipments such as set-top box, television set
For a kind of lightning protection circuit, which is applied in the electrical equipments such as set-top box, television set, specifically, can be applied to such as Fig. 2
Shown in satellite reception cable (cable of cable TV) set-top box, land antenna receives cable set-top box or EOC
(Ethernet Over Cable, Ethernet cable) and CMTS (Cable Modem Terminal Systems, cable modulation
Demodulator terminal system) environment set-top box on.
As shown in figure 3, a kind of lightning protection circuit provided in an embodiment of the present invention, comprising: level-one discharge module 10, two-stage discharge
Module 20 and three-level discharge module 30.
Level-one discharge module 10 is connected with cable input terminal and two-stage discharge module 20 respectively, defeated by cable for accessing
Enter the incoming cable signal in end and lightning stroke energy, and discharge lightning stroke energy, to 20 output cable signal of two-stage discharge module and residual
Remaining lightning stroke energy.
Two-stage discharge module 20 is also connected with three-level discharge module 30, for doing filtering processing to cable signal and with outer
Inhibition processing, and remaining lightning stroke energy is discharged, to 30 output cable signal of three-level discharge module and end lightning stroke energy.
Three-level discharge module 30 is also connected with the chip of electrical equipment, for being isolated and discharging end lightning stroke energy, to electricity
The chip transmission cable signal of device equipment.
In one embodiment, electrical equipment is preferably set-top box, and set-top box is by exposed in outdoor cable and satellite
Receiver is connected, and cable signal is satellite TV signal.When set-top box work, satellite receiver is defeated by the cable of set-top box
Enter end and input satellite TV signal (weak current) to set-top box, set-top box provides operating voltage by cable for satellite receiver.
When there is thunderstorm weather, lightning stroke energy and satellite TV signal pass through cable input terminal together and are passed to machine when cable is struck by lightning
Top box, the most lightning stroke energy of 10 quick release of level-one discharge module in the lightning protection circuit provided through this embodiment remain
The lightning stroke energy of remaining fraction remnants；It is remaining minimal amount of by the lightning stroke energy of 20 quick release of two-stage discharge module remnants
Be struck by lightning energy for end, and does filtering processing and Out-of-band rejection processing to satellite TV signal；It is isolated by three-level discharge module 30
And quick release end be struck by lightning energy, and by satellite TV signal be transferred to set-top box tuner chip and tuner power supply drive
Dynamic control chip, guarantees that set-top box works normally, and the interference be not struck by lightning and influences.
To sum up, in the technical scheme of this embodiment, when the access cable of electrical equipment meets with lightning stroke, cable input terminal
Incoming cable signal and lightning stroke energy, 10 fast and stable of level-one discharge module absorb and discharge most lightning stroke energy, to
Cable signal is filtered in 20 output cable signal of two-stage discharge module and remaining lightning stroke energy, two-stage discharge module 20
It is handled with Out-of-band rejection, and discharges remaining lightning stroke energy, to 30 output cable signal of three-level discharge module and end lightning stroke energy
Be struck by lightning energy for amount, the isolation of three-level discharge module 30 and release end, to the chip transmission cable signal of electrical equipment；By to electricity
The incoming lightning stroke energy of cable input terminal does three-level repid discharge processing, and does filtering processing to incoming cable signal and with outer
Inhibition processing, it is good to fast response time, the isolation of lightning stroke, protection effect is good and interference rejection ability is strong, improve set-top box, TV
The lightning strike protection ability and interference rejection ability of the electrical equipments such as machine.
Shown in as shown in Figure 4 and Figure 5, optionally, level-one discharge module 10 includes glass discharge vessel A；Further, glass
One end of discharge tube A is connected with cable input terminal and two-stage discharge module 20 respectively, other end ground connection；The mark of glass discharge vessel A
It is referred to as 10/700us 6KV that voltage capacity is born in pulse.
In the present embodiment, most lightning stroke energy can be absorbed to fast and stable and discharge by glass discharge vessel A,
Wherein, glass discharge vessel A has strong resistance to surge current, fast response time (nanosecond), impact resistance, performance stable, reproducible
With the service life it is long the advantages that.Although the response speed of glass discharge vessel A is quickly, but need certain response speed and time gate
Therefore limit after glass discharge vessel A electric discharge, inevitably can also be left part residual voltage, i.e., can also be by remaining lightning stroke energy and cable
Signal is output to two-stage discharge module 20 together.
Optionally, two-stage discharge module 20 includes filter unit 21 and two-stage discharge unit 22.
Filter unit 21 is connected with level-one discharge module 10 and three-level discharge module 30 respectively, for doing to cable signal
Filtering processing and Out-of-band rejection processing, to 30 output cable signal of three-level discharge module and end lightning stroke energy.
Two-stage discharge unit 22 is connected, for discharging remnants respectively with level-one discharge module 10 and three-level discharge module 30
Lightning stroke energy, to three-level discharge module 30 export end be struck by lightning energy.
Further, filter unit 21 includes bandpass filter B, and two-stage discharge unit 22 includes magnetic oxysome inductance L1, height
Frequency capacitor C and first diode D1；One end of bandpass filter B is connected with level-one discharge module 10, and the other end and three-level are discharged
Module 30 is connected；One end of magnetic oxysome inductance L1 is connected with level-one discharge module 10, other end one end with high frequency capacitance C respectively
It is connected with the cathode of first diode D1, the other end ground connection of high frequency capacitance, the plus earth of first diode D1.
Further, the upper limiting frequency of bandpass filter B is 2.15GHz, lower frequency limit 950MHz；Magnetic oxysome inductance L1
Inductance value range be 100~400nH, quality factor q > 30；The capacitance of high frequency capacitance C is 100pF；First diode D1 is
Transient Suppression Diode, the power of D1 are 3KW.
In one embodiment, magnetic oxysome inductance L1 is made by winding copper wire on magnetic oxysome；Bandpass filter B is multistage point
From junction filter, specific series depends on specific application scenarios, and the band logical frequency of bandpass filter B depends on electrical equipment
Used standard, electrical equipment provided in this embodiment use DVB-S standard, the band logical frequency of corresponding bandpass filter B
For 950MHz~2.15GHz, specific standards are regarded in other embodiments and use corresponding band logical frequency, for example, for using
The electrical equipment of DVB-C standard, the band logical frequency of bandpass filter B are 88MHz~1002MHz.
Wherein, the bandpass filter B of filter unit 21 can filter out the invalid signals except band logical frequency band, but due to
The energy signal that is struck by lightning is that moment is irregular, may have the frequency of small part lightning stroke energy signal that can fall in band logical frequency band,
It is not filtered out by bandpass filter B, therefore, it is necessary to pass through multi-stage separation Combination Design to the signal for passing through bandpass filter B
Multistage decaying is carried out, i.e., Out-of-band rejection processing is done to the signal by bandpass filter B.The magnetic oxysome electricity of two-stage discharge unit 22
Sense L1 is used to prevent the variation of electric current in circuit, and first diode D1 uses Transient Suppression Diode (TVS), and transient state inhibits two poles
Pipe has the characteristics that fast response time (subnanosecond grade) and surge absoption ability are strong, the magnetic oxysome inductance in two-stage discharge unit 22
L1, high frequency capacitance C and first diode D1, composition combination can quick release remnants lightning stroke energy.
Optionally, three-level discharge module 30 includes three-level discharge cell 31 and isolated location 32, and chip includes tuner core
Piece and tuner power driving control chip.
Three-level discharge cell 31 is connected with filter unit 21 and tuner chip respectively, for discharging end lightning stroke energy,
To tuner chip transmission cable signal.
Isolated location 32 is connected, for being isolated respectively with two-stage discharge unit 22 and tuner power driving control chip
Thunder-strike current, to tuner power driving control chip transmission cable signal.
Further, three-level discharge cell 31 includes the second diode D2, and isolated location 32 includes third diode D3；The
The cathode of two diode D2 is connected with filter unit 21 and tuner chip respectively, plus earth；The cathode of third diode D3
It is connected with two-stage discharge unit 22, anode is connected with tuner power driving control chip.
Further, the second diode D2 is Transient Suppression Diode, and the breakdown voltage of D2 is 5V；Third diode D3's
Backward voltage is 40V, forward current 2A.
In one embodiment, although lightning stroke energy is after level-one discharge module 10 and two-stage discharge module 20 are handled, only
Be left negligible faint energy, i.e., be struck by lightning energy for end, but due to the tuner chip and high frequency of electrical equipment
Head power driving control chip is very sensitive to extraneous incorrect energy (end lightning stroke energy), preferably to protect tuner core
Piece and tuner power driving control chip, and the interference rejection ability of electrical equipment is improved, three are arranged before tuner chip
Grade discharge cell 31, is arranged isolated location 32 before tuner power driving control chip.
Wherein, the second diode D2 of three-level discharge cell 31, using Transient Suppression Diode, fast response time (Ya Na
Second grade) and surge absoption ability it is strong；The third diode D3 differential concatenation of isolated location 32 is in tuner power driving control core
In circuit before piece, since electrical equipment need to be satellite reception by tuner power driving control chip and cable input terminal
Device provides operating voltage, while also needing to be isolated before tuner power driving control chip end lightning stroke energy and guaranteeing
Cable signal energy normal transmission is to tuner power driving control chip, and therefore, third diode D3 needs differential concatenation in circuit
In, and the reverse saturation current of third diode D3 is required to be greater than the weak current of cable signal, guarantee that cable signal can lead to
Cross third diode D3；In addition, third diode D3 also makes the intercaste of multiple electrical equipments (such as set-top box) in user family
Connection is in parallel, for example, the set-top box that band goes out can be cascaded directly, in parallel can share one between the set-top box that band does not go out
Cable headend equipment.
It is tested through many experiments, using lightning protection circuit provided in this embodiment, the electrical equipments such as set-top box, television set are prevented
Reachable ± the 10KV of lightning voltage, out-of-band interference inhibit than reachable -30dB；And use the thunder-lightning of the electrical equipment of prior art
Pressure range is ± (1~2) KV, and out-of-band interference inhibits than being about -10dB.Therefore, electrical equipment is provided using the embodiment of the present invention
Lightning protection circuit, it is good to the isolation of lightning stroke, protection effect is good and interference rejection ability is strong compared to using prior art.
It should be noted that the parameter of each component and component that are mentioned in the embodiment of the present invention is preferred
Scheme, and non-exclusive alternative, are not construed as the limitation of the embodiment of the present invention.
Referring to FIG. 6, the embodiment of the present invention also provides a kind of electrical equipment.
As shown in fig. 6, electrical equipment provided by the embodiment, including lightning protection circuit provided by any embodiment of the present invention.
Optionally, the electrical equipment of the present embodiment can also include: cable input terminal, tuner chip, tuner power supply
Drive control chip, demodulator, CPU (Central Processing Unit, central processing unit), decoder and HDMI (High
Definition Multimedia Interface, high-definition multimedia interface) output end etc.；Wherein, lightning protection circuit is distinguished
It is connected with cable input terminal, tuner chip and tuner power driving control chip, tuner chip is also connected with demodulator,
Tuner power driving control chip is also connected with demodulator and CPU respectively, CPU also respectively with demodulator, decoder and HDMI
Output end is connected.
Preferably, electrical equipment is set-top box or television set.
Electrical equipment provided in this embodiment, the lightning protection circuit provided using any embodiment of the present invention, to the sound of lightning stroke
It answers that speed is fast, isolation is good, protection effect is good and interference rejection ability is strong, improves the lightning stroke of the electrical equipments such as set-top box, television set
Protective capability and interference rejection ability.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of lightning protection circuit characterized by comprising level-one discharge module, two-stage discharge module and three-level discharge module；
The level-one discharge module is connected with cable input terminal and the two-stage discharge module respectively, for accessing by the electricity
The incoming cable signal of cable input terminal and lightning stroke energy, and the lightning stroke energy is discharged, Xiang Suoshu two-stage discharge module exports institute
State cable signal and remaining lightning stroke energy；
The two-stage discharge module is also connected with the three-level discharge module, for the cable signal do filtering processing and
Out-of-band rejection processing, and the lightning stroke energy of the remnants is discharged, Xiang Suoshu three-level discharge module exports the cable signal and end
End lightning stroke energy；
The three-level discharge module, is also connected with the chip of electrical equipment, for being isolated and discharging the end lightning stroke energy, to
The chip of electrical equipment transmits the cable signal.
2. lightning protection circuit as described in claim 1, which is characterized in that the two-stage discharge module includes filter unit and second level
Discharge cell；
The filter unit is connected with the level-one discharge module and three-level discharge module respectively, for the cable signal
Filtering processing and Out-of-band rejection processing are done, Xiang Suoshu three-level discharge module exports the cable signal and end lightning stroke energy；
The two-stage discharge unit is connected with the level-one discharge module and three-level discharge module respectively, described residual for discharging
Remaining lightning stroke energy, Xiang Suoshu three-level discharge module export end lightning stroke energy.
3. lightning protection circuit as claimed in claim 2, which is characterized in that the three-level discharge module include three-level discharge cell and
Isolated location, the chip include tuner chip and tuner power driving control chip；
The three-level discharge cell, is connected with the filter unit and tuner chip respectively, for discharging the end lightning stroke
Energy, Xiang Suoshu tuner chip transmit the cable signal；
The isolated location is connected, for being isolated respectively with the two-stage discharge unit and tuner power driving control chip
Thunder-strike current, Xiang Suoshu tuner power driving control chip transmit the cable signal.
4. lightning protection circuit as claimed in claim 2, which is characterized in that the filter unit includes bandpass filter B, and described two
Grade discharge cell includes magnetic oxysome inductance L1, high frequency capacitance C and first diode D1；One end of the bandpass filter B and institute
It states level-one discharge module to be connected, the other end is connected with the three-level discharge module；One end of the magnetic oxysome inductance L1 with it is described
Level-one discharge module is connected, and the other end is connected with the cathode of one end of the high frequency capacitance C and the first diode D1 respectively,
The other end of the high frequency capacitance is grounded, the plus earth of the first diode D1.
5. lightning protection circuit as claimed in claim 4, which is characterized in that the upper limiting frequency of the bandpass filter B is
2.15GHz, lower frequency limit 950MHz；The inductance value range of the magnetic oxysome inductance L1 is 100~400nH, quality factor q >
30；The capacitance of the high frequency capacitance C is 100pF；The first diode D1 is Transient Suppression Diode, and the power of D1 is 3KW.
6. lightning protection circuit as claimed in claim 3, which is characterized in that the three-level discharge cell includes the second diode D2,
The isolated location includes third diode D3；The cathode of the second diode D2 respectively with the filter unit and tuner
Chip is connected, plus earth；The cathode of the third diode D3 is connected with the two-stage discharge unit, the positive and high frequency
Head power driving control chip is connected.
7. lightning protection circuit as claimed in claim 6, which is characterized in that the second diode D2 is Transient Suppression Diode,
The breakdown voltage of D2 is 5V；The backward voltage of the third diode D3 is 40V, forward current 2A.
8. lightning protection circuit as described in claim 1, which is characterized in that the level-one discharge module includes glass discharge vessel A；Institute
The one end for stating glass discharge vessel A is connected with cable input terminal and the two-stage discharge module respectively, other end ground connection；The glass
It is 10/700us6KV that the nominal shock pulse of discharge tube A, which bears voltage capacity,.
9. a kind of electrical equipment, which is characterized in that including the lightning protection circuit as described in claim 1~8.
10. electrical equipment as claimed in claim 9, which is characterized in that the electrical equipment is set-top box or television set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804896.2A CN109473958B (en) | 2017-09-08 | 2017-09-08 | Lightning protection circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804896.2A CN109473958B (en) | 2017-09-08 | 2017-09-08 | Lightning protection circuit and electrical equipment |
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|---|---|
| CN109473958A true CN109473958A (en) | 2019-03-15 |
| CN109473958B CN109473958B (en) | 2023-11-21 |
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| CN201710804896.2A Active CN109473958B (en) | 2017-09-08 | 2017-09-08 | Lightning protection circuit and electrical equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030069A (en) * | 2019-12-06 | 2020-04-17 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection method |
| CN111049120A (en) * | 2019-12-06 | 2020-04-21 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection module |
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| CN111049120A (en) * | 2019-12-06 | 2020-04-21 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection module |
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| CN109473958B (en) | 2023-11-21 |
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