CN202997548U - Lightening protection device - Google Patents
Lightening protection device Download PDFInfo
- Publication number
- CN202997548U CN202997548U CN 201220625127 CN201220625127U CN202997548U CN 202997548 U CN202997548 U CN 202997548U CN 201220625127 CN201220625127 CN 201220625127 CN 201220625127 U CN201220625127 U CN 201220625127U CN 202997548 U CN202997548 U CN 202997548U
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- piezo
- resistance
- discharge tube
- protection device
- gas discharge
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Abstract
The utility model discloses a lightening protection device for AC power supply, which belongs to a protection device, wherein, the lightening protection device comprises a primary protection unit and a grounding unit. The primary protection unit is connected with a switch power supply unit of load equipment. The load equipment is connected with the grounding unit. The switching power supply is grounded through the primary protection unit. The load equipment is grounded through the grounding unit. The primary protection unit comprises a voltage-sensitive resistor and a gas discharge tube. The lightening protection device is advantageous in that: the lightening protection device for the AC power supply is provided; a mode of combining the gas discharge tube and the voltage-sensitive resistance is adopted for realizing common-mode or differential-mode overvoltage protection.
Description
Technical field
The utility model relates to a kind of protective device, relates in particular to a kind of AC power lightning protection device.
Background technology
In today of information age, computer network and communication apparatus are more and more accurate, the requirement of its operational environment is also more and more higher, and the moment surge voltage of thunder and lightning and large electric equipment can be passed through circuits intrusion indoor electric equipment and the network equipments such as power supply, antenna, radio signal transceiver more and more frequently, cause equipment or components and parts to damage, casualties, transmission or the data that store are interfered or lose, even make electronic equipment generation misoperation or temporary transient paralysis, system-down, transfer of data is interrupted, and local area network (LAN) and even wide area network are destroyed.Its harm is startling, and indirect loss generally is far longer than direct economic loss.
The utility model content
For the above existing technical problem, the utility model provides a kind of lightning protection device, and AC power equipment is done the protection of differential mode and common mode, guarantees that AC power is to the equipment normal power supply.
A kind of lightning protection device wherein, comprises elementary protective unit, ground unit; Described elementary protective unit is connected with the switching power supply of load equipment, and described load equipment is connected with described ground unit; Described Switching Power Supply is by described elementary protective unit ground connection, and described load equipment is by described ground unit ground connection; Described elementary protective unit comprises piezo-resistance, gas discharge tube.
Above-mentioned lightning protection device, wherein, described gas discharge tube is ceramic gas discharge tube.
Above-mentioned lightning protection device, wherein, described ground unit comprises the second gas discharge tube, described ground unit is released by described the second gas discharge tube ground connection.
Above-mentioned lightning protection device, wherein, described piezo-resistance comprises the first piezo-resistance, the second piezo-resistance, the 3rd piezo-resistance; Described elementary protective unit is provided with in power end the first parallel branch that the first piezo-resistance forms, and connect with described gas discharge tube the second parallel branch of formation of described the second piezo-resistance, described the 3rd piezo-resistance.
Above-mentioned lightning protection device, wherein, the front end circuit of described the second parallel branch is in series with resettable fuse.
Above-mentioned lightning protection device, wherein, ground connection after described the second piezo-resistance, described the 3rd piezo-resistance are connected with described gas discharge tube.
The beneficial effect of the technical program is:
A kind of AC power lightning protection device is provided, has adopted gas discharge tube and the combined mode of piezo-resistance to realize common mode and differential mode overvoltage protection.
Description of drawings
Fig. 1 is the overall structure schematic diagram of the utility model embodiment;
Fig. 2 is the lightning protection circuit schematic diagram of elementary protective unit in the utility model embodiment;
Fig. 3 is the lightning protection circuit schematic diagram of ground unit in the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, but not as restriction of the present utility model.
Be illustrated in figure 1 as the overall structure schematic diagram of the utility model embodiment, wherein, comprise elementary protective unit, ground unit; Elementary protective unit is connected with the switching power supply of load equipment, and load equipment is connected with ground unit; Switching Power Supply is by elementary protective unit ground connection, and load equipment is by ground unit ground connection; Elementary protective unit comprises piezo-resistance, gas discharge tube.
Know-why of the present utility model is: elementary protective unit is used for primary voltage is done the protection of differential mode and common mode, and ground unit is used for processing the surge current drainage function, realizes the protection power-supply device, as the protection of WLAN base station equipment power supply etc.The lightning protection device that in the present embodiment, piezo-resistance and gas discharge tube combine.The lightning protection device of this structure generally has higher through-current capability, and residual voltage is lower.The circuit structure of lightning protection device is compact, has given full play to fast characteristics of piezo-resistance reaction time, combines again gas discharge tube and has advantages of than the high throughflow ability.
In a kind of specific embodiment of a kind of lightning protection device of the utility model, piezo-resistance is the 561K10D piezo-resistance.
In a kind of specific embodiment of a kind of lightning protection device of the utility model, gas discharge tube is the 3RM470L ceramic gas discharge tube.The discharge capacity of ceramic gas discharge tube discharge capacity is as requested selected, and circuit adopts 3RM470L, and through-current capacity is 5000A, can reach 10KV by degree of protection.
Be illustrated in figure 2 as the lightning protection circuit schematic diagram of the elementary protective unit of a kind of specific embodiment of the present utility model, wherein, piezo-resistance comprises the first piezo-resistance, the second piezo-resistance, the 3rd piezo-resistance; Elementary protective unit is provided with in power end the first parallel branch that the first piezo-resistance forms, and utilizes the nonlinear characteristic of piezo-resistance, appears at two interpolars of piezo-resistance when overvoltage, and piezo-resistance can be with voltage clamping to a relatively-stationary magnitude of voltage; And second piezo-resistance, the 3rd piezo-resistance second parallel branch of connecting with gas discharge tube and forming.It is in parallel with power supply L, N respectively that piezo-resistance RV1 is positioned at paster rectification module front end, mainly come clamper L, N voltage between lines, ground connection after piezo-resistance RV0, RV2 connect with ceramic gas discharge tube U1, it is mainly the indirect lightning strike surge current on the L line of releasing that RV0 connects with U1, after RV0, RV2 short-circuit failure, U1 can separate it with power circuit, can not cause the phenomenon of catching fire.Improve the through-current capability of whole lightning protection with more piezo-resistance in lightning protection device; with gas discharge tube as standby discharge channel; gas discharge tube can effectively be eliminated the leakage current of piezo-resistance; same gas discharge tube has the afterflow function; after surge finishes; electric current on power line can make gas discharge tube be in conducting state, and piezo-resistance can effectively suppress this problem of gas discharge tube.Based on this perfect circuit structure, greatly improved the useful life of lightning protection device.Buffer action due to discharge tube; piezo-resistance almost flows through without leakage current; so just greatly slowed down the aging phenomenon that piezo-resistance produces because of the leakage current that flows through for a long time; the problems such as existing AC power lightning protection circuit effect is relatively poor, single piezo-resistance long-term work inefficacy have been solved; simultaneously under the prerequisite that guarantees reliable cut-out gas discharge tube power frequency continued flow; that the reference voltage of piezo-resistance can be selected is lower; reducing its residual voltage and clamp level, thus the equipment on protective circuit.
On the basis of technique scheme, the front end circuit of the second parallel branch is in series with resettable fuse.By this resettable fuse, when this RV1 short-circuit failure, resettable fuse can play the effect of fuse, and short circuit current is disconnected.
Be illustrated in figure 3 as the lightning protection circuit schematic diagram of the ground unit of a kind of specific embodiment of the utility model, wherein, ground unit comprises the second gas discharge tube, and ground unit is released by the second gas discharge tube ground connection.
On the basis of technique scheme, the second gas discharge tube is the GDTN3RD5-90 gas discharge tube.It can be used for the transient overvoltage Anti-surging, its high impedance, low interelectrode capacitance and high shock-resistant electric current, and under the condition of surge waveform 8/20uS, logical capacity reaches 10KA, is that other discharge tube is not available.When circuit had instantaneous overvoltage to scurry into, discharge tube was breakdown, and impedance descends rapidly, was almost short-circuit condition.Discharge tube is released large electric current by line-to-ground or loop, also with limiting voltage at electronegative potential, thereby protected circuit and equipment.
The above is only the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; should recognize that being equal to that all utilization the utility model specifications and diagramatic content done replace and the resulting scheme of apparent variation, all should be included in protection range of the present utility model.
Claims (6)
1. a lightning protection device, is characterized in that,
Comprise elementary protective unit, ground unit; Described elementary protective unit is connected with the switching power supply of load equipment, and described load equipment is connected with described ground unit;
Described Switching Power Supply is by described elementary protective unit ground connection, and described load equipment is by described ground unit ground connection;
Described elementary protective unit comprises piezo-resistance, gas discharge tube.
2. lightning protection device as claimed in claim 1, is characterized in that, described gas discharge tube is ceramic gas discharge tube.
3. lightning protection device as claimed in claim 1, is characterized in that, described ground unit comprises the second gas discharge tube, and described ground unit is released by described the second gas discharge tube ground connection.
4. lightning protection device as claimed in claim 1, is characterized in that,
Described piezo-resistance comprises the first piezo-resistance, the second piezo-resistance, the 3rd piezo-resistance;
Described elementary protective unit is provided with in power end the first parallel branch that the first piezo-resistance forms, and connect with described gas discharge tube the second parallel branch of formation of described the second piezo-resistance, described the 3rd piezo-resistance.
5. lightning protection device as claimed in claim 5, is characterized in that, the front end circuit of described the second parallel branch is in series with resettable fuse.
6. lightning protection device as claimed in claim 5, is characterized in that, ground connection after described the second piezo-resistance, described the 3rd piezo-resistance are connected with described gas discharge tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220625127 CN202997548U (en) | 2012-11-23 | 2012-11-23 | Lightening protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220625127 CN202997548U (en) | 2012-11-23 | 2012-11-23 | Lightening protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997548U true CN202997548U (en) | 2013-06-12 |
Family
ID=48568680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220625127 Expired - Fee Related CN202997548U (en) | 2012-11-23 | 2012-11-23 | Lightening protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202997548U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579512A (en) * | 2017-08-29 | 2018-01-12 | 嘉善恒兴电力建设有限公司 | A kind of anti-lightning strike switching power circuit |
-
2012
- 2012-11-23 CN CN 201220625127 patent/CN202997548U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579512A (en) * | 2017-08-29 | 2018-01-12 | 嘉善恒兴电力建设有限公司 | A kind of anti-lightning strike switching power circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20191123 |