CN209860593U - Follow-on parallel 20KA thunderbolt protection module - Google Patents
Follow-on parallel 20KA thunderbolt protection module Download PDFInfo
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- CN209860593U CN209860593U CN201921042684.6U CN201921042684U CN209860593U CN 209860593 U CN209860593 U CN 209860593U CN 201921042684 U CN201921042684 U CN 201921042684U CN 209860593 U CN209860593 U CN 209860593U
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- piezoresistor
- gas discharge
- mov2
- discharge tube
- parallel
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Abstract
The utility model discloses an improved parallel 20KA lightning stroke protection module, it includes piezo-resistor MOV1, piezo-resistor MOV2, ceramic gas discharge tube GDT2, piezo-resistor MOV3 and piezo-resistor MOV 4; one end of the piezoresistor MOV1 is electrically connected with the N end after being connected in parallel with the piezoresistor MOV2, the other end of the piezoresistor MOV2 is electrically connected with the L end after being connected in series with the ceramic gas discharge tube GDT2, one end of the piezoresistor MOV3 is electrically connected with the PE end after being connected in parallel with the piezoresistor MOV4, and the other end of the piezoresistor MOV1 is electrically connected with a node between the piezoresistor MOV2 and the ceramic gas discharge tube GDT 2; the voltage-dependent voltages of the piezoresistors MOV1, MOV2, MOV3 and MOV4 are 330V, and the pulse breakdown voltage of the ceramic gas discharge tube GDT2 is 600V. The utility model discloses can carry out the lightning protection effectively and hit the protection, avoid the damage to access device.
Description
Technical Field
The utility model relates to a lightning protection circuit technical field, especially a follow-on parallel 20KA thunderbolt protection module.
Background
Most of the lightning protection schemes of the AC220V power supply port used in the industry adopt 3 groups of piezoresistors with the voltage-dependent voltage of 470V and 1 ceramic gas discharge tube with the voltage of 600V, so that not only are a plurality of used protection devices used, but also the surge residual voltage is high.
Because the lightning protection device is generally used for surge protection of the AC220V switching power supply, a MOSFET is generally arranged at the rear end for PWM chopping, and the MOSFET belongs to a voltage sensitive device, once instantaneous overvoltage occurs at a differential mode part, the MOSFET is easy to break down and damage.
Most of the parallel lightning protection devices are connected by wires, and because the transient impedance of the wires is large, the transient residual voltage is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, a follow-on parallel 20KA thunderbolt protection module is provided.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: an improved parallel 20KA lightning stroke protection module comprises a piezoresistor MOV1, a piezoresistor MOV2, a ceramic gas discharge tube GDT2, a piezoresistor MOV3 and a piezoresistor MOV 4; one end of the piezoresistor MOV1 is electrically connected with the N end after being connected in parallel with the piezoresistor MOV2, the other end of the piezoresistor MOV2 is electrically connected with the L end after being connected in series with the ceramic gas discharge tube GDT2, one end of the piezoresistor MOV3 is electrically connected with the PE end after being connected in parallel with the piezoresistor MOV4, and the other end of the piezoresistor MOV1 is electrically connected with a node between the piezoresistor MOV2 and the ceramic gas discharge tube GDT 2; the voltage-dependent voltages of the piezoresistors MOV1, MOV2, MOV3 and MOV4 are 330V, and the pulse breakdown voltage of the ceramic gas discharge tube GDT2 is 600V.
In the technical scheme, the piezoresistor MOV1, the piezoresistor MOV2, the piezoresistor MOV3 and the piezoresistor MOV4 are all piezoresistors with the model number of 20D331KT 10S.
In the technical scheme, the ceramic gas discharge tube GDT2 is a ceramic gas discharge tube with the model number SC2E8-600 HL.
In the above technical scheme, the pin after the improved parallel 20KA lightning protection module is packaged is a PCB.
The utility model has the advantages that:
1) the differential mode part adopts a 20D331KT10S piezoresistor with 330V piezovoltage to be connected with a 600V SC2E8-600HL ceramic gas discharge tube in series, so that the residual voltage is reduced, the MOSFET at the rear end is effectively protected, and the defective rate of product lightning stroke damage is reduced.
2) The lightning protection module is designed in a mode that the PCB is used as the pin, and can be directly welded on a client product, so that the space is saved, and the residual voltage is effectively reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an improved parallel 20KA lightning strike protection module includes a varistor MOV1, a varistor MOV2, a ceramic gas discharge tube GDT2, a varistor MOV3 and a varistor MOV 4; one end of the piezoresistor MOV1 and the piezoresistor MOV2 are electrically connected with the N end after being connected in parallel, the other end of the piezoresistor MOV1 and the piezoresistor MOV2 are electrically connected with the L end after being connected in series with the ceramic gas discharge tube GDT2, one end of the piezoresistor MOV3 and the piezoresistor MOV4 are electrically connected with the PE end after being connected in parallel, and the other end of the piezoresistor MOV1 and the piezoresistor MOV2 are electrically connected with a node between the ceramic gas discharge tube GDT 2. The piezoresistors MOV1, MOV2, MOV3 and MOV4 are all piezoresistors of type 20D331KT10S, and the voltage-dependent voltage is 330V. The ceramic gas discharge tube GDT2 is a ceramic gas discharge tube with the model number SC2E8-600HL, and the pulse breakdown voltage is 600V.
And the pin after the improved parallel 20KA lightning stroke protection module is packaged is a PCB (printed Circuit Board). This 20KA lightning protection module is the parallel lightning protection device, and most parallel lightning protection devices all adopt the mode of wire connection, because the transient impedance of wire is great, transient residual voltage can be higher, and in order to stop above problem emergence, this lightning protection module adopts the PCB board to design as the mode of pin, can directly with lightning protection module welding on customer's product, not only practiced thrift the space, effectively reduced the residual voltage moreover. The structure using the PCB as the pin can refer to the chinese utility model patent with the publication number CN 203490906U, which is not described herein again.
The utility model discloses a theory of operation:
the utility model discloses a thunderbolt protection module is used for AC220V power port, has contained differential mode and common mode surge protection function, can bear the 8/20us electric current ripples of nominal 20 KA. The protection circuits adopted by the L-N (between the L end and the N end) and the L-PE (between the L end and the PE end) are custom-made 20D331KT10S piezoresistors (MOV) which are connected in series with 600V SC2E8-600HL ceramic Gas Discharge Tubes (GDT), and the protection circuits adopted by the N-PE are two sets of custom-made 20D331KT10S piezoresistors which are connected in series. The customized model is a model product produced and sold by Shenzhen Shuqian electronic shares, and specific parameters are not described herein again.
When differential mode surge is impacted from an AC220V interface, because the protection module adopts the piezoresistor with the piezovoltage of 20D331KT10S, the selection is very ingenious, the differential mode surge residual voltage can be reduced, and the situation that the piezoresistor is damaged by overvoltage breakdown for a long time can not occur in the moment of surge. As the 20D331KT10S piezoresistor with the piezovoltage of 330V is adopted, the piezoresistor has large leakage current during normal use, and a 600V SC2E8-600HL ceramic gas discharge tube GDT2 is connected in series on the piezoresistor for prolonging the service life of the piezoresistor.
When the surge impact frequency is too much, the failure mode of the piezoresistor is that the leakage current is gradually increased until breakdown damage is caused, and the failure mode of the ceramic gas discharge tube is open circuit, so that the fire phenomenon caused by pressure-sensitive failure can not occur. Due to the existence of the piezoresistor, the ceramic gas discharge tube does not have the follow current problem.
Because the L-PE also has the high voltage of AC220V during normal use, so the protection circuit of L-PE is the same as that of L-N, the utility model discloses with L-PE and L-N's 600V ceramic gas discharge tube (GDT 2) sharing one, not only saved the space of PCB board, still practiced thrift the cost.
Because the N-PE has no long-time high voltage, the N-PE does not need to be connected with a ceramic gas discharge tube in series, and the piezoresistor of the common-mode surge protection is connected with the piezoresistor in series.
The above embodiments are merely illustrative and not restrictive, and all equivalent changes and modifications made by the methods described in the claims are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides a follow-on parallel 20KA thunderbolt protection module which characterized in that: the device comprises a piezoresistor MOV1, a piezoresistor MOV2, a ceramic gas discharge tube GDT2, a piezoresistor MOV3 and a piezoresistor MOV 4; one end of the piezoresistor MOV1 is electrically connected with the N end after being connected in parallel with the piezoresistor MOV2, the other end of the piezoresistor MOV2 is electrically connected with the L end after being connected in series with the ceramic gas discharge tube GDT2, one end of the piezoresistor MOV3 is electrically connected with the PE end after being connected in parallel with the piezoresistor MOV4, and the other end of the piezoresistor MOV1 is electrically connected with a node between the piezoresistor MOV2 and the ceramic gas discharge tube GDT 2; the voltage-dependent voltages of the piezoresistors MOV1, MOV2, MOV3 and MOV4 are 330V, and the pulse breakdown voltage of the ceramic gas discharge tube GDT2 is 600V.
2. The improved parallel 20KA lightning protection module of claim 1, characterized in that: the piezoresistor MOV1, the piezoresistor MOV2, the piezoresistor MOV3 and the piezoresistor MOV4 are all piezoresistors with the model number of 20D331KT 10S.
3. The improved parallel 20KA lightning protection module of claim 1, characterized in that: the ceramic gas discharge tube GDT2 is a ceramic gas discharge tube with the model number SC2E8-600 HL.
4. The improved parallel 20KA lightning protection module of claim 1, characterized in that: the pin after the improved parallel 20KA lightning stroke protection module is packaged is a PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921042684.6U CN209860593U (en) | 2019-07-05 | 2019-07-05 | Follow-on parallel 20KA thunderbolt protection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921042684.6U CN209860593U (en) | 2019-07-05 | 2019-07-05 | Follow-on parallel 20KA thunderbolt protection module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209860593U true CN209860593U (en) | 2019-12-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921042684.6U Active CN209860593U (en) | 2019-07-05 | 2019-07-05 | Follow-on parallel 20KA thunderbolt protection module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209860593U (en) |
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2019
- 2019-07-05 CN CN201921042684.6U patent/CN209860593U/en active Active
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