CN103366953B - Electrion protective device and radio frequency transmission equipment - Google Patents
Electrion protective device and radio frequency transmission equipment Download PDFInfo
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- CN103366953B CN103366953B CN201310203756.1A CN201310203756A CN103366953B CN 103366953 B CN103366953 B CN 103366953B CN 201310203756 A CN201310203756 A CN 201310203756A CN 103366953 B CN103366953 B CN 103366953B
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Abstract
The invention discloses a kind of electrion protective device and radio frequency transmission equipment, this electrion protective device comprises the isolation capacitance (2) being arranged at radio frequency transmission device signal port and the circuit board (1) installing this isolation capacitance (2), the pin (22) that described isolation capacitance (2) comprises electric capacity main body (21) and is connected with electric capacity main body (21), described pin (21) is connected on described circuit board (1), the bottom of described electric capacity main body (21) is exposed, interval is formed between the exposed part of described electric capacity main body (21) and described circuit board (1), described electrion protective device also comprises the metallic conductor (3) of ground connection, and described metallic conductor (3) is arranged in described interval, and with described exposed part at intervals.The volume of mesohigh discharge protector of the present invention is little, cost is low, its can isolated DC, coupled RF, take into account discharge prevention.
Description
Technical field
The present invention relates to a kind of radio frequency transmission device, particularly relate to a kind of high pressure protector of radio frequency transmission equipment.
Background technology
The anti-high voltage protective of the signal port of the radio frequency transmission equipment of existing broadcast television industry all realizes by the device such as discharge tube, overcurrent inductance usually.Such as, but in recent years, along with the raising of radio frequency transmission equipment competitive pressure, require that radio frequency transmission equipment is to low cost, miniaturization, there is shortcomings in the devices such as existing discharge tube, large overcurrent inductance: the first, device cost is higher; The second, device large volume takes up room larger.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of electrion protective device and radio frequency transmission equipment of improvement.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of electrion protective device, comprise the isolation capacitance being arranged at described radio frequency transmission device signal port and the circuit board installing this isolation capacitance, two pins that described isolation capacitance comprises electric capacity main body and is connected with electric capacity main body, described two pins are connected on described circuit board, the bottom of described electric capacity main body is exposed, is formed with interval between the exposed part of described electric capacity main body and described circuit board; Described electrion protective device also comprises the exposed at least in part and metallic conductor of ground connection; described metallic conductor is arranged in described interval; and relative with described exposed part interval, described exposed part when the voltage being applied to described isolation capacitance reaches certain value to described metallic conductor sparkover.
Further, described isolation capacitance is flaky electric capacity, it comprises sheet dielectric, is arranged at described dielectric respectively, two pellet electrodes on two opposite faces and coating layer, described two pins and described two pellet electrodes are electrically connected, described coating layer is by coated for the top of described sheet dielectric and described two pellet electrodes, and the bottom of described sheet dielectric and described two pellet electrodes is exposed.
Further, described isolation capacitance is ceramic condenser, and described dielectric is ceramic chip.
Further, described metallic conductor comprises exposed main part, and described main part is relative with the exposed bottom of described electric capacity main body.
Further, described metallic conductor is installed on the below of described electric capacity bottom part body across ground.
Further, the spacing of the exposed part of described metallic conductor and described electric capacity main body is less than 2 ㎜.
The present invention also provides a kind of radio frequency transmission equipment, comprise the port circuit be arranged in signal port, described port circuit comprises isolation capacitance, two pins that described isolation capacitance comprises electric capacity main body and is connected with electric capacity main body, and described electric capacity main body comprises exposed part; Described port circuit also comprises the exposed at least in part and metallic conductor of ground connection, and described metallic conductor is relative with described exposed part interval, exposed part when the voltage being applied to described isolation capacitance reaches certain value to described metallic conductor sparkover.
Further, described port circuit comprises circuit board, and described two pins are connected on this circuit board, and described exposed part is positioned at the bottom of described electric capacity main body, be formed with interval between described exposed part and described circuit board, described metallic conductor is arranged in described interval.
Further, described isolation capacitance is flaky electric capacity, it comprises sheet dielectric, is arranged at two pellet electrodes on described dielectric two opposite face and coating layer respectively, described two pins and described two pellet electrodes are electrically connected, described coating layer is by coated for the top of described sheet dielectric and described two pellet electrodes, and the bottom of described sheet dielectric and described two pellet electrodes is exposed.
Further, the spacing of the exposed part of described metallic conductor and described electric capacity main body is less than 2 ㎜.
Beneficial effect of the present invention is: the electrion protective device in the present invention is by transforming with the isolation capacitance of port circuit; make the bottom of electric capacity main body exposed; and between this exposed part and circuit board, be provided with the metallic conductor of ground connection; to realize electrion protection; cost is low; take up space little, easily assemble.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of one embodiment of the present invention mesohigh discharge protector;
Fig. 2 is the structural representation of isolation capacitance in Fig. 1;
Fig. 3 be in Fig. 2 isolation capacitance A-A to cutaway view;
Fig. 4 is the schematic diagram of electrion protective device of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figure 1, the electrion protective device in a preferred embodiment of the invention can be used for cable TV, is arranged at the signal port place of radio-frequency apparatus, is mainly used in isolated DC, coupled RF, also take into account the protection of electrion simultaneously.This device comprises isolation capacitance 2, circuit board 1 and metallic conductor 3, and this isolation capacitance 2 is fixedly connected with on the circuit card 1, metallic conductor 3 ground connection.
This isolation capacitance 2 comprises pin 22 and electric capacity main body 21, and this isolation capacitance 2 is fixing on the circuit card 1 by pin 22, and this circuit board 1 and isolation capacitance 2 are arranged on the input of radio-frequency apparatus signal port.The bottom of this electric capacity main body 21 is exposed, and when being installed on circuit board 1, have gap between this exposed part and circuit board 1, metallic conductor 3 is arranged between this gap, and this metallic conductor 3 is relative with the exposed part of electric capacity main body 21.
Together consult Fig. 2 and Fig. 3, this electric capacity main body comprises coating layer 211, electrode 212 and dielectric 213, electrode 212 is arranged on the two sides of dielectric 213, electrode 212 and dielectric 213 have been wrapped up a part by coating layer 211, also expose a part simultaneously, in the present embodiment, this exposed portion is arranged on the bottom of electric capacity main body 21.
Preferably, the preferred version that electrode 212 is exposed is that two electrodes 212 are all exposed, because be discharge between two electrodes 212, if only have one exposedly also can improve discharge voltage.
In the present embodiment, this electric capacity main body 21 is sheet, and electrode 212 is sheet, and the dielectric 213 in this electric capacity main body 2 is ceramic chip, intelligible, and in some other embodiment, the material that this dielectric 213 also can be other is made.
Owing to requiring that isolation capacitance 2 has high voltage discharge function, be therefore preferably flaky electric capacity.In some other embodiment, this isolation capacitance 2 can be other types electric capacity, such as, use SMD electric capacity.
As shown in Figure 1, this metallic conductor 3 comprises main part, the kink to equidirectional bending is respectively arranged with at the two ends of main part, this metallic conductor by two kinks across the circuit board 1 being installed on below electric capacity main body 21 on, intelligible in some other embodiment, this metallic conductor 3 also can be designed to other shape, can reach the object of electric capacity main body 21 to its sparkover.
The main part of this metallic conductor 3 is exposed, this exposed part is corresponding with the exposed base section of electric capacity main body 21, the main part of this metallic conductor 3 and the exposed part of electric capacity main body 21 have certain interval, and in the present embodiment, this metallic conductor 3 is less than 2 ㎜ with the distance of electric capacity main body 21 exposed part.
Adopting this to be less than the design of 2 ㎜, is for avoiding isolation capacitance 2 to accumulate too much energy, energy can be allowed earlier to discharge, avoid breaking element near distance.Isolation capacitance 2 has quite a few energy to discharge to metallic conductor 3 when discharging, metallic conductor 3 plays the effect of energy dispersive.Therefore metallic conductor 3 is more near better with the distance of isolation capacitance 2, through overtesting measuring and calculating, and distance easy damage device too high more than sparking voltage during 2mm.
Together consult Fig. 4, in figure, the first port is the port of radio-frequency apparatus, C in isolation capacitance 2(figure) be connected in the circuit of the first port, and isolation capacitance 2 just arranges metallic conductor 3 to ground connection, and the second port of external equipment connects on this first port; When the first port produces high pressure; this isolation capacitance 2 is because the barish structure of its uniqueness; it is made to carry out sparkover to metallic conductor 3, energy thus absorbed by metallic conductor 3 and directly import the earth into, and then protection the second port and external equipment below thereof.
Adopt this kind of structure, compared with reaching discharge prevention with the device that the port by the input at video equipment arranges discharge tube or large overcurrent inductance, the present embodiment passes a ground connection bare metal conductor 3 bottom isolation capacitance 2, this metallic conductor 3 is arranged on the opposing circuit board 1 of the exposed bottom of electric capacity main body 21, this is arranged does not increase original space substantially, and when product can be protected not damaged by high pressure, big current, circuit board 1 can better be arranged and design, product can be made to accomplish smaller and more exquisite; And the present invention greatly reduces cost.
When voltage is raised to certain value time, show-through position produces sparkover, releases energy in advance.And conventional capacitive could sparkover after needing to run up to very high energy, electric capacity chip is at this moment breakdown or break, and circuit will be smashed, afunction.
This apparatus structure is simple, and electrion defencive function, by utilizing metallic conductor 3, realizes the absorption to high-pressure energy, and this apparatus structure is little, and each assembly is with low cost, saves device material expense expensive in large product.In addition, the advantages such as it is long that this device also has the life-span, not fragile.
In addition, this isolation capacitance 2 still has the effect of isolated DC, coupled RF concurrently, concrete principle is: because high-frequency signal belongs to AC signal, electric capacity presents low impedance characteristic to AC signal, frequency more high impedance is less, therefore almost can be ignored by the impedance of electric capacity the high-frequency signal of cable TV (5MHz-3000MHz).And isolation capacitance 2 pairs of direct currents present impedance is ∞, cannot pass through.
Alternatively, this radio frequency transmission equipment, comprises port circuit, and this port circuit comprises isolation capacitance 2, two pins 22 that this isolation capacitance 2 comprises electric capacity main body 21 and is connected with electric capacity main body 21, and this electric capacity main body 21 comprises exposed part.Port circuit also comprises the exposed at least in part and metallic conductor 3 of ground connection, and described metallic conductor 3 is relative with described exposed part interval, exposed part when the voltage being applied to described isolation capacitance 2 reaches certain value to the sparkover of described metallic conductor 3.
In the present embodiment, this isolation capacitance 2 is flaky electric capacity, this isolation capacitance 2 comprises sheet dielectric 213, electrode 212 and coating layer 211, this electrode is pellet electrode 212, two electrodes 212 are arranged on described dielectric 213 liang of opposite faces respectively, two pins 22 and two pellet electrodes 212 are electrically connected, and this coating layer 211 is by coated for the top of sheet dielectric 213 and two pellet electrodes 212, and the bottom of sheet dielectric 213 and two pellet electrodes 212 is exposed.
In the present embodiment, this metallic conductor 3 is less than 2 ㎜ with the spacing of the exposed part of electric capacity main body 21, and adopting this to be less than the design of 2 ㎜, is for avoiding isolation capacitance 2 to accumulate too much energy, energy can be allowed earlier to discharge, avoid breaking element near distance.Isolation capacitance 2 has quite a few energy to discharge to metallic conductor 3 when discharging, metallic conductor 3 plays the effect of energy dispersive.
Bottom isolation capacitance 2, a ground connection bare metal conductor 3 is passed in the present embodiment; this metallic conductor 3 is relative with the exposed bottom of electric capacity main body 21; this is arranged does not increase original space (generally all can have an isolation capacitance at the signal port itself of radio-frequency apparatus or device) substantially; and when product can be protected not damaged by high pressure, big current; product can be made to accomplish smaller and more exquisite, greatly reduce cost.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an electrion protective device, comprise the isolation capacitance (2) of the signal port being arranged at radio frequency transmission equipment and the circuit board (1) of this isolation capacitance (2) is installed, two pins (22) that described isolation capacitance (2) comprises electric capacity main body (21) and is connected with electric capacity main body (21), described two pins (22) are connected on described circuit board (1), it is characterized in that, the bottom of described electric capacity main body (21) is exposed, interval is formed between the exposed part of described electric capacity main body (21) and described circuit board (1), described electrion protective device also comprises the exposed at least in part and metallic conductor of ground connection (3), described metallic conductor (3) is arranged in described interval, and relative with described exposed part interval, described exposed part when the voltage being applied to described isolation capacitance reaches certain value to described metallic conductor (3) sparkover.
2. electrion protective device according to claim 1, it is characterized in that, described isolation capacitance is flaky electric capacity, it comprises sheet dielectric (213), be arranged at two pellet electrodes (212) on described dielectric (213) two opposite face and coating layer (211) respectively, described two pins (22) and described two pellet electrodes (212) are electrically connected, described coating layer (211) is by coated for the top of described sheet dielectric (213) and described two pellet electrodes (212), the bottom of described sheet dielectric (213) and described two pellet electrodes (212) is exposed.
3. electrion protective device according to claim 2, is characterized in that, described isolation capacitance (2) is ceramic condenser, and described dielectric (213) is ceramic chip.
4. electrion protective device according to claim 3, is characterized in that, described metallic conductor (3) comprises exposed main part, and described main part is relative with the exposed bottom of described electric capacity main body (21).
5. electrion protective device according to claim 4, is characterized in that, described metallic conductor (3) is installed on the below of described electric capacity main body (21) bottom across ground.
6. according to claim 1 ?electrion protective device according to any one of 5, it is characterized in that, described metallic conductor (3) is less than 2 ㎜ with the spacing of the exposed part of described electric capacity main body (21).
7. a radio frequency transmission equipment, comprise the port circuit be arranged in signal port, described port circuit comprises isolation capacitance (2), two pins (22) that described isolation capacitance (2) comprises electric capacity main body (21) and is connected with electric capacity main body (21), it is characterized in that, described electric capacity main body (21) comprises exposed part; Described port circuit also comprises the exposed at least in part and metallic conductor of ground connection (3), described metallic conductor (3) is relative with described exposed part interval, exposed part when the voltage being applied to described isolation capacitance (2) reaches certain value to described metallic conductor (3) sparkover.
8. radio frequency transmission equipment according to claim 7, it is characterized in that, described port circuit comprises circuit board (1), described two pins (22) are connected on this circuit board (1), described exposed part is positioned at the bottom of described electric capacity main body (21), be formed with interval between described exposed part and described circuit board (1), described metallic conductor (3) is arranged in described interval.
9. radio frequency transmission equipment according to claim 8, it is characterized in that, described isolation capacitance (2) is flaky electric capacity, it comprises sheet dielectric (213), be arranged at two pellet electrodes (212) on described dielectric (213) two opposite face and coating layer (211) respectively, described two pins (22) and described two pellet electrodes (212) are electrically connected, described coating layer (211) is by coated for the top of described sheet dielectric (213) and described two pellet electrodes (212), the bottom of described sheet dielectric (213) and described two pellet electrodes (212) is exposed.
10. radio frequency transmission equipment according to claim 9, is characterized in that, described metallic conductor (3) is less than 2 ㎜ with the spacing of the exposed part of described electric capacity main body (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310203756.1A CN103366953B (en) | 2013-05-28 | 2013-05-28 | Electrion protective device and radio frequency transmission equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310203756.1A CN103366953B (en) | 2013-05-28 | 2013-05-28 | Electrion protective device and radio frequency transmission equipment |
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| Publication Number | Publication Date |
|---|---|
| CN103366953A CN103366953A (en) | 2013-10-23 |
| CN103366953B true CN103366953B (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310203756.1A Expired - Fee Related CN103366953B (en) | 2013-05-28 | 2013-05-28 | Electrion protective device and radio frequency transmission equipment |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387203A (en) * | 2001-05-17 | 2002-12-25 | 佳邦科技股份有限公司 | Structure of transient over-voltage protector element |
| CN1678162A (en) * | 2003-09-19 | 2005-10-05 | 夏普株式会社 | Static electricity protective circuit and high-frequency circuit apparatus incorporating the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341267A (en) * | 1991-09-23 | 1994-08-23 | Aptix Corporation | Structures for electrostatic discharge protection of electrical and other components |
| JP4157860B2 (en) * | 2004-07-29 | 2008-10-01 | 財団法人石油産業活性化センター | Explosion-proof wireless device |
| TWI377755B (en) * | 2008-11-28 | 2012-11-21 | Cyntec Co Ltd | Over-voltage protecting device and method for making thereof |
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2013
- 2013-05-28 CN CN201310203756.1A patent/CN103366953B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387203A (en) * | 2001-05-17 | 2002-12-25 | 佳邦科技股份有限公司 | Structure of transient over-voltage protector element |
| CN1678162A (en) * | 2003-09-19 | 2005-10-05 | 夏普株式会社 | Static electricity protective circuit and high-frequency circuit apparatus incorporating the same |
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| Publication number | Publication date |
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| CN103366953A (en) | 2013-10-23 |
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