CN210183010U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
- Publication number
- CN210183010U CN210183010U CN201920713196.7U CN201920713196U CN210183010U CN 210183010 U CN210183010 U CN 210183010U CN 201920713196 U CN201920713196 U CN 201920713196U CN 210183010 U CN210183010 U CN 210183010U
- Authority
- CN
- China
- Prior art keywords
- gas discharge
- discharge tube
- circuit
- surge protection
- protection circuit
- 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.)
- Active
Links
Images
Abstract
The utility model provides a surge protection circuit, this circuit include fuse F1, piezo-resistor MOV1-3 and gas discharge tube GDT1, fuse F1 set up in the entrance of live wire L, piezo-resistor MOV1 and MOV 2's one end are connected, the tie point is connected with gas discharge tube GDT 1's one end, gas discharge tube's the other end ground connection; the other end of the voltage dependent resistor MOV1 is connected with a live wire L and a protected circuit, and the other end of the voltage dependent resistor MOV2 is connected with a neutral wire N and the protected circuit; a voltage dependent resistor MOV3 is also connected between the live line L and the neutral line N. The utility model discloses a when the circuit is used, suffer the thunderbolt when the external circuit, the input produces the surge, and the energy of overwhelming majority discharges the ground through the conduction of varistor MOV1 or varistor MOV2 through the gas discharge tube, and varistor establishes ties with gas discharge tube, and this kind of design has can improve afterflow breaking capacity and the little characteristics of leakage current.
Description
Technical Field
The utility model belongs to the surge protection field of gas, concretely relates to surge protection circuit.
Background
In the circuit, it is often interfered by external transient overvoltage, and these interference sources mainly include: operating overvoltage due to on-off inductive load or on-off high-power load, line fault and the like; lightning surge caused by natural phenomena such as lightning is transient interference, and the surge voltage can seriously damage the safe operation of an electronic system. Eliminating surge noise interference and preventing surge damage are always the core problems related to safe and reliable operation of electronic equipment.
In the prior art, a voltage dependent resistor is usually selected as a protection device in a surge protection circuit. Because the voltage resistance of the piezoresistor is low, in order to meet the requirements of lightning surge protection, the piezoresistor is generally required to be taken down during safety test, however, the voltage resistance requirement of the current safety certification is high, a regular certification authority requires a complete unit to be certified, and the voltage resistance is not allowed to be taken down in order to meet the voltage resistance requirement. Therefore, in the surge protection circuit in the prior art, the requirements for protecting lightning surge and safety voltage resistance are difficult to meet at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a surge protection circuit to the problem that current surge protection circuit is difficult to satisfy protection thunderbolt surge requirement and safe withstand voltage's requirement simultaneously.
The technical scheme of the utility model is that:
the utility model provides a surge protection circuit, this circuit include fuse F1, piezo-resistor MOV1-3 and gas discharge tube GDT1, fuse F1 set up in the entrance of live wire L, piezo-resistor MOV1 and MOV 2's one end are connected, the tie point is connected with gas discharge tube GDT 1's one end, gas discharge tube GDT 1's the other end ground connection; the other end of the voltage dependent resistor MOV1 is connected with a live wire L and a protected circuit, and the other end of the voltage dependent resistor MOV2 is connected with a neutral wire N and the protected circuit; a voltage dependent resistor MOV3 is also connected between the live line L and the neutral line N, and the voltage dependent resistor MOV3 is connected in parallel with the protected circuit.
Further, a transient diode TVS is connected between the live wire L and the zero wire N, and the transient diode TVS is connected with the protected circuit in parallel.
Further, the gas discharge tube GDT1 includes two edge electrodes and a ceramic tube between the two edge electrodes, the ceramic tube has an inwardly recessed hollow tube, the top end and the bottom end of the hollow tube are matched with the size of the two edge electrodes, and the tube diameter of the middle section is smaller than the channel tube diameter of the top end and the bottom end.
Furthermore, the hollow pipe of the gas discharge tube GDT1 is provided with a slope surface between the passage of the matching section of the side electrode and the passage of the middle section.
Furthermore, the size of the tube body of the gas discharge tube GDT1 is phi 8 multiplied by 6mm, and both ends of the tube body are provided with leads with the diameter of 0.8mm as pins and are installed on a circuit board.
Furthermore, the withstand voltage value of the gas discharge tube GDT1 is greater than AC1500V, and the on-surge capability value is 10 KA.
The utility model has the advantages that:
the utility model discloses a when the circuit is used, suffer the thunderbolt when the external circuit, the input produces the surge, and the energy of overwhelming majority discharges the ground through the conduction of varistor MOV1 or varistor MOV2 through the gas discharge tube, and varistor establishes ties with gas discharge tube, and this kind of design has can improve afterflow breaking capacity and the little characteristics of leakage current.
In the utility model, because the reaction speed of the gas discharge tube is slow and the residual voltage is high, the voltage dependent resistor MOV3 discharges a part of energy flowing through the previous stage, and simultaneously the residual voltage is reduced, so that the stable voltage is provided for the subsequent protected equipment; meanwhile, due to the structural particularity of the gas discharge tube, the gas discharge tube can bear the insulating and voltage-resisting capabilities of a live wire, a ground and a zero wire, and the ground.
The utility model discloses in, further increase the accurate restriction back level voltage of transient diode TVS, guarantee equipment ability safety and stability operation.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.
Fig. 1 shows a schematic structural diagram of the present invention.
Fig. 2 shows a schematic view of the structure of the gas discharge tube.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
As shown in fig. 1, the present invention provides a surge protection circuit, which includes a fuse F1, a varistor MOV1-3 and a gas discharge tube GDT1, wherein the fuse F1 is disposed at an entrance near a live line L, one end of the varistor MOV1 and one end of the varistor MOV2 are connected, the connection point is connected to one end of the gas discharge tube GDT1, and the other end of the gas discharge tube GDT1 is grounded; the other end of the voltage dependent resistor MOV1 is connected with a live wire L and a protected circuit, and the other end of the voltage dependent resistor MOV2 is connected with a neutral wire N and the protected circuit; a voltage dependent resistor MOV3 is also connected between the live line L and the neutral line N, and the voltage dependent resistor MOV3 is connected in parallel with the protected circuit. When an external circuit is struck by lightning, the input end generates surge, most energy is discharged to the ground through the conduction of a piezoresistor MOV1 or a piezoresistor MOV2 through a gas discharge tube, and the piezoresistor is connected with the gas discharge tube in series. Meanwhile, because the reaction speed of the gas discharge tube is relatively slow, the residual voltage is high, the voltage dependent resistor MOV3 discharges a part of energy flowing through the previous stage, and the residual voltage is reduced, so that stable voltage is supplied to subsequent protected equipment.
As shown in fig. 1, a transient diode TVS is further connected between the live line L and the neutral line N, and the transient diode TVS is connected in parallel with the protected circuit; and the transient diode TVS is added to accurately limit the rear-stage voltage, so that the safe and stable operation of the equipment can be guaranteed.
As shown in fig. 2, the gas discharge tube GDT1 includes two side electrodes and a ceramic tube between the two side electrodes, the ceramic tube has an inwardly recessed hollow tube, the top and bottom ends of the hollow tube match the size of the two side electrodes, and the diameter of the middle section is smaller than the diameter of the channel tubes at the top and bottom ends; a slope surface is formed between the passage of the gas discharge tube GDT1 and the passage of the middle section of the hollow tube, wherein the passage of the gas discharge tube GDT1 is matched with the passage of the side electrode; due to the structural particularity of the gas discharge tube, the gas discharge tube can bear the insulation and voltage resistance of a live wire, a ground and a zero wire, and the ground.
Furthermore, the size of the tube body of the gas discharge tube GDT1 is phi 8 multiplied by 6mm, and both ends of the tube body are provided with leads with the diameter of 0.8mm as pins and are installed on a circuit board.
Furthermore, the withstand voltage value of the gas discharge tube GDT1 is greater than AC1500V, and the on-surge capability value is 10 KA.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (6)
1. A surge protection circuit is characterized by comprising a fuse F1, a piezoresistor MOV1-3 and a gas discharge tube GDT1, wherein the fuse F1 is arranged at the inlet of a live wire L, one ends of the piezoresistor MOV1 and the MOV2 are connected, the connecting point is connected with one end of the gas discharge tube GDT1, and the other end of the gas discharge tube GDT1 is grounded; the other end of the voltage dependent resistor MOV1 is connected with a live wire L and a protected circuit, and the other end of the voltage dependent resistor MOV2 is connected with a neutral wire N and the protected circuit; a voltage dependent resistor MOV3 is also connected between the live line L and the neutral line N, and the voltage dependent resistor MOV3 is connected in parallel with the protected circuit.
2. The surge protection circuit of claim 1, wherein a transient diode TVS is further connected between said live line L and neutral line N, said transient diode TVS being connected in parallel with said protected circuit.
3. The surge protection circuit of claim 1 wherein said gas discharge tube GDT1 comprises two side electrodes and a ceramic tube between said two side electrodes, said ceramic tube having an inwardly recessed hollow tube, said hollow tube having top and bottom ends sized to match the size of said two side electrodes, and an intermediate section having a smaller diameter than the diameter of said top and bottom channel tubes.
4. The surge protection circuit of claim 3 wherein the hollow tube of said gas discharge tube GDT1 is sloped with the passage between the side electrode mating passage and the middle passage.
5. The surge protection circuit of claim 1, wherein said gas discharge tube GDT1 has a tube size of Φ 8 x 6mm, and has leads with a diameter of 0.8mm at both ends as pins for mounting on a circuit board.
6. The surge protection circuit of claim 1, wherein said gas discharge tube GDT1 has a withstand voltage value greater than AC1500V and a power-on surge value of 10 KA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920713196.7U CN210183010U (en) | 2019-05-17 | 2019-05-17 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920713196.7U CN210183010U (en) | 2019-05-17 | 2019-05-17 | Surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210183010U true CN210183010U (en) | 2020-03-24 |
Family
ID=69834084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920713196.7U Active CN210183010U (en) | 2019-05-17 | 2019-05-17 | Surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210183010U (en) |
-
2019
- 2019-05-17 CN CN201920713196.7U patent/CN210183010U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8503150B2 (en) | Electrical interface protecting apparatus | |
| CN210183010U (en) | Surge protection circuit | |
| CN204012686U (en) | A kind of serial interface circuit with lightning protection function | |
| CN102931592A (en) | Lightning-protection power distribution cabinet | |
| CN202997329U (en) | Lightning-protection power distribution cabinet | |
| CN208571600U (en) | A kind of high voltage testing device current sampling protection circuit | |
| JPS6348124A (en) | Lightening surge protector | |
| CN202663106U (en) | Open-circuit prevention protective circuit for end screen grounding | |
| CN220692824U (en) | Surge protection circuit with low leakage current and long service life | |
| CN106505545B (en) | A kind of surge protecting circuit and surge protector | |
| CN210273497U (en) | Differential mode surge protection circuit | |
| CN210577777U (en) | Single-phase lightning protection device | |
| CN216056319U (en) | High-reliability lightning protection circuit | |
| CN202111470U (en) | Lightning and surging protection circuit | |
| CN204992561U (en) | Cable television signal surge protector | |
| CN209169951U (en) | Gas pipeline/oil pipeline insulating joint protector | |
| CN215498263U (en) | Circuit with multiple surge protection | |
| CN214958699U (en) | Lightning protection structure of electromagnetic pulse filtering power supply | |
| CN210985656U (en) | Signal lightning protection device with isolated ground wire | |
| CN214626357U (en) | Self-adaptive neutral point grounding device of 3kV-66kV power distribution system | |
| CN213959752U (en) | High-frequency switching power supply input surge protection circuit | |
| CN210041322U (en) | Equipotential connector | |
| CN211151532U (en) | Portable data communication station | |
| CN210074763U (en) | SPD for realizing surge protection of RS485 port by using electronic current limiter | |
| CN201234127Y (en) | Leakage protection circuit and apparatus for non-balance interface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |