CN206759047U - A kind of RF joints lightning prevention circuit - Google Patents
A kind of RF joints lightning prevention circuit Download PDFInfo
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- CN206759047U CN206759047U CN201720136380.0U CN201720136380U CN206759047U CN 206759047 U CN206759047 U CN 206759047U CN 201720136380 U CN201720136380 U CN 201720136380U CN 206759047 U CN206759047 U CN 206759047U
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- electric discharge
- discharge component
- inductance
- prevention circuit
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Abstract
The utility model discloses a kind of RF joints lightning prevention circuit, including RF joints, electric discharge component and inductance, signal input part that the signal output parts of the RF joints passes through one first capacitance connection RF chips；The signal output part of the RF joints is also connected with the output end of the electric discharge component, the input end grounding of the electric discharge component；One end of the inductance connects the signal input part of the RF chips, the other end ground connection of the inductance.Using the utility model embodiment, it can protect the RF chips on TV mainboards from damage caused by thunderbolt to greatest extent, anti-lightning strike protective effect is played to RF joints, reduces thunderbolt damage to caused by TV mainboards.
Description
Technical field
TV motherboard circuit technical fields are the utility model is related to, specifically a kind of RF joints lightning prevention circuit.
Background technology
RF joints (Radio Frequency；Radio-frequency joint), for connecting the RF lines of TV signal, the numeral letter of TV
Number and analog signal be all by this joint enter TV mainboards within.As described in Figure 1, its be prior art provide a kind of RF
The connection diagram of RF joints in junction circuit, the signal that the signal output parts of RF joints passes through isolation capacitance C1 connection RF chips
Input, the TV signal of exchange are coupled to the RF chips at mainboard end by isolation capacitance C1, carried out by RF chips at decoding
Reason；The earthing of casing of RF joints but it is not joined directly together with the earth of mainboard, but coupling company is carried out by electric capacity C2 and electric capacity C3
Connect.
In remote mountain area, people, by after the radio TV signals receiving in space, pass through RF lines and RF often through plug-in antenna
Joint is connected to realize watching for TV programme.However, for thunderstorm multiple season or area, with regard to existing technical scheme
Speech, when thunderbolt occurs, plug-in antenna can be influenceed by being struck by lightning, and high pressure caused by thunderbolt is directly delivered into mainboard end, from
And by the RF wafer damages on C1 and mainboard, cause greatly to lose.
The content of the invention
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of RF joints lightning prevention circuit, plays
Anti-lightning strike protective effect, reduce thunderbolt damage to caused by TV mainboards.
In order to achieve the above object, the utility model embodiment provides a kind of RF joints lightning prevention circuit, including RF connects
Head, electric discharge component and inductance, the signal output part of the RF joints are inputted by the signal of one first capacitance connection RF chips
End；The signal output part of the RF joints is also connected with the output end of the electric discharge component, the input of the electric discharge component
Ground connection；One end of the inductance connects the signal input part of the RF chips, the other end ground connection of the inductance.
Compared with prior art, a kind of RF joints lightning prevention circuit that the utility model embodiment provides is in existing RF joints
On the basis of circuit, an electric discharge component is added before first electric capacity respectively, is increased after first electric capacity
An inductance is over the ground added；Release RF joints are delivered to by RF lines and transmitted to mainboard end by the electric discharge component
The energy being largely struck by lightning, then the energy that remainder is struck by lightning is released to by ground by the inductance over the ground, protect to greatest extent
Shield below the RF chips on mainboard from caused by thunderbolt damage；In addition, the inductance over the ground to the TV signal of high frequency not
Have an impact, ensure that the use of TV is unaffected.Therefore, the circuit being so made up of an electric discharge component and an inductance,
Good anti-lightning strike protective effect can be played, greatly reduces thunderbolt damage to caused by TV mainboards.
Preferably, the electric discharge component is TVS pipe, and the input, output end of the electric discharge component corresponds to institute respectively
State anode, the negative electrode of TVS pipe.
As the improvement project of above-described embodiment, the electric discharge component that the present embodiment uses is TVS pipe (Transient
Voltage Suppressor；Transient voltage suppressor diode)；Told TVS pipe has the response time (subnanosecond level) being exceedingly fast
With at a relatively high surge absoption ability；When TVS pipe both ends are subjected to high-energy (high pressure caused by the thunderbolt) impact of moment, TVS
Pipe can be such that its impedance reduces suddenly with high speed, while absorb an instantaneous large-current, so as to which its both end voltage be clamped
One it is predetermined numerically, it is ensured that the RF chips on the first electric capacity and mainboard below are from high voltage transient spike
Impact and damage, play good anti-lightning strike protective effect.
Preferably, the earth terminal of the RF joints passes through one second capacity earth.
Preferably, the input of the electric discharge component passes through second capacity earth.
Preferably, second electric capacity is mainly made up of two electric capacity parallel connections.
Brief description of the drawings
Fig. 1 is the connection diagram of RF joints in a kind of RF junction circuits that prior art provides；
Fig. 2 is a kind of circuit theory diagrams for RF joints lightning prevention circuit that the utility model embodiment 1 provides；
Fig. 3 is a kind of circuit theory diagrams for RF joints lightning prevention circuit that the utility model embodiment 2 provides.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Embodiment 1
Referring to Fig. 2, it is a kind of circuit theory diagrams for RF joints lightning prevention circuit that the utility model embodiment 1 provides.
A kind of RF joints lightning prevention circuit of the present embodiment 1 includes RF joints T1, electric discharge component D1, inductance L1 and first
Electric capacity C1；Wherein, the signal output part RF (i.e. RF joints T1 1 pin) of the RF joints T1 passes through the first electric capacity C1 connections
The signal input part RF_INPUT of RF chips；The signal output part RF (i.e. RF joints T1 1 pin) of the RF joints T1 is also connected with
The output end of the electric discharge component D1, the input end grounding of the electric discharge component D1；One end connection institute of the inductance L1
State the signal input part RF_INPUT, the inductance L1 of RF chips other end ground connection.
The operation principle of the present embodiment 1 is described in detail below in conjunction with the accompanying drawings：
When be struck by lightning occur when, moment can produce high pressure, RF joint T1 are delivered to by RF lines, and from RF joints T1 signal
Output end RF (i.e. RF joints T1 1 pin) transmits to the signal input part RF_INPUT of RF chips, now wink caused by the thunderbolt
Between high pressure can be applied on electric discharge component D1, electric discharge component D1 can release the energy being largely struck by lightning；And remainder
Point voltage couple by the first electric capacity C1, for the thunderbolt voltage for low frequency, inductance L1 impedance be it is low-down,
Now inductance L1 is equivalent to being shorted to, then the voltage of the remainder to be come by the first electric capacity C1 couplings will also pass through
Inductance L1 is released on the ground；For the TV signal of high frequency, inductance L1 impedance is very big, now inductance L1
Equivalent to open circuit, thus for TV signal be do not have it is influential.
Compared with prior art, a kind of RF joints lightning prevention circuit that the utility model embodiment 1 provides connects in existing RF
On the basis of head circuit, an electric discharge component D1 is added before the first electric capacity C1 respectively, is increased after the first electric capacity C1
An inductance L1 is over the ground added；Released by the electric discharge component D1 and RF joints T1 is delivered to and to mainboard end by RF lines
The energy being largely struck by lightning of transmission, then the energy that remainder is struck by lightning is released to by ground by the L1 of inductance over the ground, it is maximum
The RF chips protected below on mainboard of limit are from damage caused by thunderbolt；In addition, electricity of the L1 of inductance over the ground to high frequency
Do not have an impact depending on signal, ensure that the use of TV is unaffected.Therefore, so by an electric discharge component D1 and an inductance
The circuit of L1 compositions, good anti-lightning strike protective effect is served, greatly reduce thunderbolt damage to caused by TV mainboards.
Embodiment 2
Referring to Fig. 3, it is a kind of circuit theory diagrams for RF joints lightning prevention circuit that the utility model embodiment 2 provides.
A kind of RF joints lightning prevention circuit of the present embodiment 2 includes RF joints T1, TVS pipe D2, inductance L1, the first electric capacity C1
With the second electric capacity (electric capacity C3 and electric capacity C4 in parallel)；Wherein, the signal output part RF of the RF joints T1 (i.e. RF joints T1's
1 pin) pass through the signal input part RF_INPUT, the earth terminal RF_ of the RF joints T1 of the first electric capacity C1 connection RF chips
GND (i.e. RF joints T1 2~4 pin) is grounded by second electric capacity (electric capacity C3 and electric capacity C4 in parallel)；The RF joints
T1 signal output part RF (i.e. RF joints T1 1 pin) is also connected with the negative electrode of the TVS pipe D2, and the anode of the TVS pipe D2 leads to
Cross second electric capacity (electric capacity C3 and electric capacity C4 in parallel) ground connection；One end of the inductance L1 connects the signal of the RF chips
Input RF_INPUT, the inductance L1 other end ground connection.
The operation principle of the present embodiment is described in detail below in conjunction with the accompanying drawings：
When be struck by lightning occur when, moment can produce high pressure, RF joint T1 are delivered to by RF lines, and from RF joints T1 signal
Output end RF (i.e. RF joints T1 1 pin) transmits to the signal input part RF_INPUT of RF chips, now wink caused by the thunderbolt
Between high pressure can be applied on TVS pipe D2, when the voltage on TVS pipe D2 reach its conducting threshold value when, TVS pipe D2 can be with high
Speed its impedance is reduced suddenly, while an instantaneous large-current is absorbed, so as to the energy that is largely struck by lightning of releasing；And remain
The voltage of remaining part point couples by the first electric capacity C1, and for the thunderbolt voltage for low frequency, inductance L1 impedance is very
Low, now inductance L1 is equivalent to being shorted to ground, then the voltage of the remainder to be come by the first electric capacity C1 couplings is also
It can be released to by inductance L1 on the ground；For the TV signal of high frequency, inductance L1 impedance be it is very big, now
Inductance L1 equivalent to open circuit, therefore for TV signal be do not have it is influential.
It should be understood that the electric discharge component of the present embodiment 2 is TVS pipe D2, and when thunderbolt occurs, moment caused by thunderbolt
Voltage can be applied on TVS pipe D2, and when the voltage on TVS pipe D2 reaches the threshold value of TVS pipe D2 conductings, TVS pipe D2 can release
Fall the energy being largely struck by lightning.But only technical scheme is described by taking TVS pipe D2 as an example for the present embodiment, the utility model
Electric discharge component in a kind of RF joints lightning prevention circuit provided is not limited to TVS pipe D2.Therefore, in other embodiments,
Electric discharge component can also be gas-discharge tube (Gas Tube), TVS pipe, piezo-resistance etc., be carried out by these components
Electric discharge, the energy being largely struck by lightning of releasing.Wherein, TVS pipe D2 anode, negative electrode correspond respectively to the input of electric discharge component
End, output end.
It should be understood that second electric capacity of the present embodiment is mainly made up of electric capacity C3 and electric capacity C4 parallel connections, and electric capacity C3 and
The earth terminal RF_GND (i.e. RF joints T1 2~4 pin) and TVS pipe D2 of one end connection RF joints T1 after electric capacity C4 parallel connections sun
Pole, another termination mainboard, mainly play a part of isolation.But it is using two electric capacity C3 and electric capacity C4 in parallel
As the more excellent embodiment of the utility model, and understand to can reach above-mentioned purpose using an electric capacity.In addition, the RF
Joint T1 earth terminal RF_GND (i.e. RF joints T1 2~4 pin) is grounded by the electric capacity C3 in parallel and electric capacity C4, mainly
It is protective grounding, prevents from leaking electricity.Because in other embodiments, RF joints T1 earth terminal RF_GND in other embodiments
(i.e. RF joints T1 2~4 pin) can be with earth-free or only by electric capacity C2 or electric capacity C3 connection mainboards.
As the improvement project of above-described embodiment 1, the electric discharge component that the present embodiment 2 uses is TVS pipe D2；Told TVS
Pipe D2 has the response time (subnanosecond level) being exceedingly fast and at a relatively high surge absoption ability；When TVS pipe D2 both ends are subjected to moment
High-energy (high pressure caused by thunderbolt) impact when, TVS pipe D2 can be such that its impedance reduces suddenly with high speed, absorb simultaneously
One instantaneous large-current, so as to by its both end voltage clamp one it is predetermined numerically, it is ensured that the first electric capacity C1 below with
And the RF chips on mainboard damage from the impact of high voltage transient spike, good anti-lightning strike protective effect is played.
It the above is only better embodiment of the present utility model, it is noted that above-mentioned better embodiment should not regard
For to limitation of the present utility model.The scope of protection of the utility model should be defined by claim limited range.For
For those skilled in the art, do not departing from spirit and scope of the present utility model, can also make some
Improvements and modifications, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (5)
1. a kind of RF joints lightning prevention circuit, it is characterised in that including RF joints, electric discharge component and inductance, the RF joints
The signal output part signal input part that passes through one first capacitance connection RF chips；The signal output part of the RF joints is also connected with
The output end of the electric discharge component, the input end grounding of the electric discharge component；One end of the inductance connects the RF cores
The signal input part of piece, the other end ground connection of the inductance.
A kind of 2. RF joints lightning prevention circuit as claimed in claim 1, it is characterised in that the electric discharge component is TVS pipe,
The input, output end of the electric discharge component corresponds to the anode of the TVS pipe, negative electrode respectively.
3. a kind of RF joints lightning prevention circuit as claimed in claim 1, it is characterised in that the earth terminal of the RF joints passes through
One second capacity earth.
A kind of 4. RF joints lightning prevention circuit as claimed in claim 3, it is characterised in that the input of the electric discharge component
Pass through second capacity earth.
A kind of 5. RF joints lightning prevention circuit as described in claim 3 or 4, it is characterised in that second electric capacity mainly by
Two electric capacity are in parallel to be formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720136380.0U CN206759047U (en) | 2017-02-15 | 2017-02-15 | A kind of RF joints lightning prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720136380.0U CN206759047U (en) | 2017-02-15 | 2017-02-15 | A kind of RF joints lightning prevention circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206759047U true CN206759047U (en) | 2017-12-15 |
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ID=60609412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720136380.0U Active CN206759047U (en) | 2017-02-15 | 2017-02-15 | A kind of RF joints lightning prevention circuit |
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| CN (1) | CN206759047U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683169A (en) * | 2018-05-29 | 2018-10-19 | 北京北广科技股份有限公司 | Semiconductor field effect transistor guard method and device in radio-frequency power supply |
| CN111781551A (en) * | 2020-07-28 | 2020-10-16 | 国家电网有限公司 | Protection circuit of pulse calibrator is put in office |
-
2017
- 2017-02-15 CN CN201720136380.0U patent/CN206759047U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683169A (en) * | 2018-05-29 | 2018-10-19 | 北京北广科技股份有限公司 | Semiconductor field effect transistor guard method and device in radio-frequency power supply |
| CN111781551A (en) * | 2020-07-28 | 2020-10-16 | 国家电网有限公司 | Protection circuit of pulse calibrator is put in office |
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