CN2052585U - Anti-thunder protector for radio equipment - Google Patents
Anti-thunder protector for radio equipment Download PDFInfo
- Publication number
- CN2052585U CN2052585U CN 89201756 CN89201756U CN2052585U CN 2052585 U CN2052585 U CN 2052585U CN 89201756 CN89201756 CN 89201756 CN 89201756 U CN89201756 U CN 89201756U CN 2052585 U CN2052585 U CN 2052585U
- Authority
- CN
- China
- Prior art keywords
- radio equipment
- thunder
- protector
- zinc
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Abstract
The utility model discloses an anti-thunder protector used for radio equipment. The residual voltage of lightning and the striking back voltage of a ground lead are formed in an antenna system during lightning strike and often break down the radio equipment to enter the earth through the zero line of power source. The utility model utilizes the A characteristic high nonlinear coefficient of a zinc oxide voltage dependent resistor V to form the anti-thunder protector which is used for the power source end of the radio equipment. The utility model can effectively decrease harm to the radio equipment during lightning strike and has the advantages of low cost, small size and high reliability, having actual meanings for the anti-thunder protection of radio stations using high antennas, master antenna televisions (CATV) and household televisions.
Description
The utility model is a kind of wireless device lightning protection device, relates to the circuit emergency protective device.
In the wireless device that uses aerial rig, all be that lightning protection device is added between the antenna end and ground terminal of equipment, but this device is big to the distributed constant influence of high-frequency signal, and can not protects wireless device effectively.
The purpose of this utility model is that design is a kind of to not influence of high-frequency signal, and can protect the anti-lightening protector of wireless device effectively.
Wireless device all has antenna system, no matter is that lightning rod, antenna directly connect sudden strain of a muscle during thunderbolt, and near still generation thunderbolt forms indirect lightning strike to equipment, and thunder-strike current all will go into ground by certain approach.People often think that thunder and lightning goes into ground by safety line.But, on antenna, form higher residual voltage because the existence of (1) ground wire grounded resistance makes thunder and lightning decay in time with going into; To produce when (2) ground lead has inductance (every meter length reaches the microhenry level) thunderbolt and fight back voltage.These two kinds of voltages finally all are applied to the device antenna end.The equipment of often can seeing after the thunderbolt is smashed, and punctures as power transformer and burns, and Insurance Block and metal chassis puncture, and the output tank circuit of sender and the input circuit of receiver damage.On the contrary, if wireless device only connects antenna, do not connect power supply, being struck by lightning the chance of damaging will be much smaller.Just illustrating that below thunder and lightning also has an important channel with going into: go into ground by zero-power line behind the puncture equipment.
This anti-lightening protector adopts Zinc-oxide piezoresistor to make basic original paper, and it is connected between the power transformer primary side and ground wire of equipment.Zinc-oxide piezoresistor has leakage current little (μ A level), and non linear coefficient is big, and residual voltage is low, and the response that abrupt wave is gushed is fast, and the voltage-current characteristic symmetry can not make good characteristics such as current changing rate (di)/(dt) increasing.And its volume is little, and the reliability height is cheap.So adopt this kind element to constitute anti-lightening protector, be comparatively ideal.
On concrete formation, when being used for single-phase alternating current, can respectively connect a Zinc-oxide piezoresistor at each end of device power supply (DPS) primary, and, see Fig. 1 for details at both ends of power Zinc-oxide piezoresistor in parallel to ground.
The nominal voltage of three Zinc-oxide piezoresistors (puncture voltage) is chosen for 2～2.5 times of sinusoidal voltage effective value.Can select the piezo-resistance of 470V during the 220V alternating current for use, the piezo-resistance discharge capacity should select more than the 5KA.Because R
1R
2Nominal voltage less than the puncture voltage between primary and secondary in the wireless device power transformer and iron core (requiring under 2120V, 10mA condition, to carry out Insulation Test in a minute) as the CATV power transformer.R during thunderbolt
1R
2At first puncture, the thunder and lightning that enters into equipment is incorporated into ground.Protected the safety of power transformer, prevented that especially transformer from puncturing the Secondary cases that causes and damaging.R
3Effect be the unexpected high pressure that may produce on the circuit for eliminating.
When being used for the 380V three-phase alternating current, the anti-lightening protector structure is seen Fig. 2.Be to connect a Zinc-oxide piezoresistor between every phase and ground, its nominal voltage is 820V, and discharge capacity is more than the 5KA.
This anti-lightening protector requires in use with ground end ground connection nearby.
Through repeatedly experimental verification.Though this anti-lightening protector is simple in structure, cheap, can effectively protect wireless device.Blow power safety during thunderbolt at most, and can damage equipment.At areal, several CATV systems that this anti-lightening protector is housed are safe and sound in the back of repeatedly being struck by lightning, and do not take a plurality of CATV system round damage in various degree after thunderbolt of this measure.
Claims (5)
1, a kind of wireless device that is used for by the anti-lightening protector that zinc oxide varistor constitutes, is characterized in that being connected to zinc oxide varistor between the power transformer primary side of equipment and ground wire.
2, anti-lightening protector as claimed in claim 1 is characterized in that respectively connecing a Zinc-oxide piezoresistor to ground at each end of device power supply (DPS) primary.
3, anti-lightening protector as claimed in claim 2 is characterized in that connecing a zinc oxide varistor again between the single phase alternating current power supply two ends.
4, anti-lightening protector as claimed in claim 1, the discharge capacity that it is characterized in that Zinc-oxide piezoresistor is more than 5KA.
5, anti-lightening protector as claimed in claim 1, the nominal voltage that it is characterized in that Zinc-oxide piezoresistor are 2～2.5 times of sinusoidal voltage effective value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89201756 CN2052585U (en) | 1989-02-20 | 1989-02-20 | Anti-thunder protector for radio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89201756 CN2052585U (en) | 1989-02-20 | 1989-02-20 | Anti-thunder protector for radio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2052585U true CN2052585U (en) | 1990-02-07 |
Family
ID=4859610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89201756 Withdrawn CN2052585U (en) | 1989-02-20 | 1989-02-20 | Anti-thunder protector for radio equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2052585U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100438254C (en) * | 2006-04-12 | 2008-11-26 | 叶林 | Thunderstroke protection circuit capable of avoiding being reliably protecting electric net power supply thander struck by directly |
-
1989
- 1989-02-20 CN CN 89201756 patent/CN2052585U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100438254C (en) * | 2006-04-12 | 2008-11-26 | 叶林 | Thunderstroke protection circuit capable of avoiding being reliably protecting electric net power supply thander struck by directly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |