CN208015361U - A kind of lightning protection circuit and driving power can be used for voltage-withstand test - Google Patents
A kind of lightning protection circuit and driving power can be used for voltage-withstand test Download PDFInfo
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- CN208015361U CN208015361U CN201820225784.1U CN201820225784U CN208015361U CN 208015361 U CN208015361 U CN 208015361U CN 201820225784 U CN201820225784 U CN 201820225784U CN 208015361 U CN208015361 U CN 208015361U
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Abstract
The utility model is related to a kind of lightning protection circuit and driving power can be used for voltage-withstand test, which includes：Series connection varistor and discharge circuit；The first end of the series connection varistor accesses firewire, and the second end of the series connection varistor is connect with the discharge circuit, and the third of the series connection varistor is terminated into zero curve；The discharge circuit is also respectively connected with the firewire and protecting field；When meeting with lightning stroke, the series connection varistor and the discharging circuit conduction and the high voltage relief that generates lightning stroke is to protecting field.The starting point for energy of releasing can be greatly reduced in the utility model, and effective protection late-class circuit substantially enhances lightning protection grade, and do not limited by voltage-withstand test.
Description
Technical field
The utility model is related to field of power supplies, more specific protecting field is said, is related to a kind of thunder-lightning can be used for voltage-withstand test
Road and driving power.
Background technology
Discharge tube is a kind of high pressure protector, and when discharge tube both end voltage is more than its rated range, internal meeting is short
Road.The connection mode of discharge tube is that one end and varistor are in parallel, and one end connects protecting field (PE).
Varistor is a kind of with varistor.When the voltage being added in above it is less than its threshold values, stream
The electric current for crossing it is minimum, is equivalent to a valve shut；When voltage is more than its threshold values, its resistance value becomes smaller, thus
It increases sharply so that flowing through its electric current.
When ac input circuit, which is met with, to be struck by lightning, ac input end will produce transient high voltage, at this moment the resistance of varistor
Value can become smaller moment, instantaneous short circuit inside discharge tube, meet with the moment of lightning stroke in this way, alternating current circuit is connect with the earth, powerful
Voltage and current is unloaded, and is effectively protected equipment.
Because of the requirement of dielectric compressive resistance：Input is to exporting 3750Vac；Input reinforces insulation to the earth 1850Vac, and nothing is hit
It wears, without arcing.It cannot be connected in voltage-withstand test so the breakdown voltage value of discharge tube must assure that.Therefore, gas-discharge tube
It needs to select high-pressure type, and then meets the voltage-withstand test of circuit over the ground, but if select the gas of high-pressure type (such as 3000V or more)
Body discharge tube can cause the to release starting point of energy is elevated, and cannot be effectively protected late-class circuit.Common mode 6KV or more is difficult to lead to
Cross test.
Utility model content
The technical problem to be solved by the present invention is to for the drawbacks described above of the prior art, provide one kind and can be used for
The lightning protection circuit and driving power of voltage-withstand test.
Technical solution adopted by the utility model to solve its technical problems is：It constructs and a kind of can be used for the anti-of voltage-withstand test
Thunder and lightning road, including：Series connection varistor and discharge circuit；
The first end of the series connection varistor accesses firewire, second end and the electric discharge electricity of the series connection varistor
Road connects, and the third of the series connection varistor is terminated into zero curve；The discharge circuit is also respectively connected with the firewire and protection
Ground；
When meeting with lightning stroke, the series connection varistor and the discharging circuit conduction and the high voltage relief generated that will be struck by lightning arrive
Protecting field.
Preferably, the series connection varistor includes：4th varistor MOV4 and the second varistor MOV2；
The first end of the 4th varistor MOV4 is connected to the fire as the first end of the series connection varistor
Line, the second end of the 4th varistor MOV4 are described by the second varistor MOV2 connections discharge circuit
4th varistor MOV4's and the second varistor MOV2 is connected in series with third of the end as the series connection varistor
End is connected to the zero curve；
The connecting pin that the second varistor MOV2 is connect with the discharge circuit is the of the series connection varistor
Two ends.
Preferably, the discharge circuit includes：First varistor MOV1, switching circuit and discharge tube FDG1；
The first end of the first varistor MOV1 accesses the firewire, the second end of the first varistor MOV1
It is connect with the switching circuit, the switching circuit also connects protecting field by the discharge tube FDG1；
The first varistor MOV1 and the switching circuit be connected in series with end also with second varistor
MOV2 connections.
Preferably, the switching circuit includes：Turning circuit and second switch；
Described turning circuit one end is connect with the external circuit for providing switching signal, and the turning circuit other end passes through institute
It states second switch and is respectively connected to the second end of the first varistor MOV1 and the discharge tube FDG1.
Preferably, the second switch includes relay, the relay include first end, second end, the 5th end and
6th end；
The first end of the relay connects protecting field by the discharge tube FDG1, the second end of the relay with it is described
The second end of first varistor MOV1 connects, and the 5th end of the relay is connected to the turning circuit, the relay
The 6th end ground connection.
Preferably, the turning circuit includes inductance L2-B and diode D1；
The one end the inductance L2-B is connect with the external circuit, and the inductance L2-B other ends are with the diode D1's
Anode connects, and the cathode of the diode D1 is connect with the 5th end of the relay.
Preferably, further include that circuit, the protection circuit is protected to be connected on the firewire and the varistor of connecting
Between first end.
Preferably, the protection circuit includes protector F1, and the one end the protector F1 is connect with the firewire, the guarantor
The dangerous device F1 other ends are connect with the first end of the series connection varistor.
Preferably, the discharge tube FDG1 is gas-discharge tube.
The utility model also provides a kind of driving power, including the above-described lightning protection circuit that can be used for voltage-withstand test.
The lightning protection circuit that can be used for voltage-withstand test for implementing the utility model, has the advantages that：The lightning protection circuit
Including：Series connection varistor and discharge circuit；The first end of the series connection varistor accesses firewire, the pressure-sensitive electricity of series connection
The second end of resistance is connect with the discharge circuit, and the third of the series connection varistor is terminated into zero curve；The discharge circuit is also
It is separately connected the firewire and protecting field；When meeting with lightning stroke, the series connection varistor and the discharging circuit conduction and by thunder
The high voltage relief of generation is hit to protecting field.The starting point for energy of releasing, effective protection rear class electricity can be greatly reduced in the utility model
Road substantially enhances lightning protection grade, and is not limited by voltage-withstand test.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural schematic diagram for the lightning protection circuit that can be used for voltage-withstand test that the utility model embodiment provides；
Fig. 2 is the circuit diagram for the lightning protection circuit that can be used for voltage-withstand test that the utility model embodiment provides.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing carries out
It is described in detail.
As shown in Figure 1, the lightning protection circuit that can be used for voltage-withstand test of the utility model may include connect varistor 11 with
And discharge circuit 12；The first end of series connection varistor 11 accesses firewire, the second end and discharge circuit of varistor 11 of connecting
The third of 12 connections, series connection varistor 11 is terminated into zero curve；Discharge circuit 12 is also respectively connected with firewire and protecting field；Meet with thunder
When hitting, connect varistor 11 and the conducting of discharge circuit 12 and the high voltage relief that generates lightning stroke are to protecting field.It is to be appreciated that
For the lightning protection circuit of the utility model when carrying out voltage-withstand test, discharge circuit 12 is not turned on (being off-state), does not influence resistance to
Pressure test, the high voltage relief that can be quickly generated lightning stroke when meeting with lightning stroke to protecting field, effective protection late-class circuit.
As shown in Fig. 2, in Fig. 2, L indicates that firewire, N indicate zero curve.The series connection varistor 11 of the utility model can wrap
It includes：4th varistor MOV4 and the second varistor MOV2.Wherein, the first end of the 4th varistor MOV4 is pressed as series connection
The first end of quick resistance 11 is connected to firewire, and the second end of the 4th varistor MOV4 is put by the second varistor MOV2 connections
Circuit 12, the 4th varistor MOV4 and the second varistor MOV2's is connected in series with end as connecting the of varistor 11
Three ends are connected to zero curve；The connecting pin that second varistor MOV2 is connect with discharge circuit 12 is the second of series connection varistor 11
End.It is to be appreciated that during voltage-withstand test, since discharge circuit 12 is off-state, the 4th varistor MOV4 and the
Two varistor MOV2 are not turned on, and are not had an impact to voltage-withstand test.
Optionally, the 4th varistor MOV4 and the second varistor MOV2 can be zinc oxide varistor, carbonization
At least one in silicon varistor, metal-oxide varistor, germanium (silicon) piezoresistor, barium titanate piezoresistor
Kind.
Discharge circuit 12 may include：First varistor MOV1, switching circuit and discharge tube FDG1.First varistor
The first end of MOV1 accesses firewire, and the second end of the first varistor MOV1 is connect with switching circuit, and switching circuit is also by putting
Fulgurite FDG1 connects protecting field；The end that is connected in series with of first varistor MOV1 and switching circuit also connects with the second varistor MOV2
It connects.Specifically, during voltage-withstand test, discharge tube is made by the effect of switching circuit for off-state by switching circuit
The pressure-sensitive pipe MOV1 of FDG1 and first, the second pressure-sensitive pipe MOV2 are disconnected, and are not had an impact to voltage-withstand test.It is to be appreciated that just
Often when work, switching circuit is conducting state, and discharge tube FDG1 is connected to the first pressure-sensitive pipe MOV1, the second pressure-sensitive pipe MOV2, when
It is rapid by the 4th pressure-sensitive pipe MOV4, the first pressure-sensitive pipe MOV1, the second pressure-sensitive pipe MOV2 and discharge tube FDG1 when meeting with lightning stroke
The instantaneous pressure that lightning stroke generates is released to protecting field, and then effective protection late-class circuit.It is to be appreciated that the first pressure-sensitive pipe
MOV1 may be that zinc oxide varistor, silicon carbide varistor, metal-oxide varistor, germanium (silicon) are pressure-sensitive
At least one of resistor, barium titanate piezoresistor.
Alternatively, discharge tube FDG1 is gas-discharge tube.Further, discharge tube FDG1 can be for low-pressure type (such as
Gas-discharge tube 600V).By the way that switching circuit is arranged, the gas-discharge tube that low-pressure type can be selected realizes electric discharge, can substantially drop
The starting point of low energy of releasing, is effectively protected late-class circuit；Meanwhile during voltage-withstand test, by discharge tube FDG1 and first
Pressure-sensitive pipe MOV1, the second pressure-sensitive pipe MOV2 are disconnected, and so that discharge tube FDG1 is in not on-state, are avoided discharge tube FDG1 to resistance to
The influence for pressing test, makes this lightning protection circuit under the premise of need not select high-pressure type discharge tube, both can be with effective protection rear class
Circuit substantially enhances lightning protection grade, can not also be limited by voltage-withstand test and (can reach 12KV or more lightning protection level estimate).
As shown in Fig. 2, switching circuit may include：Turning circuit 121 and second switch 122.121 one end of turning circuit with carry
For the external circuit connection of switching signal, 121 other end of turning circuit is respectively connected to the first pressure-sensitive electricity by second switch 122
Hinder the second end and discharge tube FDG1 of MOV1.
Alternatively, second switch 122 includes relay, i.e., relay realization can be used in second switch 122.Wherein, after
Electric appliance includes first end, second end, the 5th end and the 6th end；The first end of relay connects protecting field by discharge tube FDG1,
The second end of relay is connect with the second end of the first varistor MOV1, and the 5th end of relay is connected to turning circuit 121,
6th end of relay is grounded.
Turning circuit 121 includes inductance L2-B and diode D1；The one end inductance L2-B is connect with external circuit, inductance L2-B
The other end is connect with the anode of diode D1, and the cathode of diode D1 and the 5th end of relay connect.
Specifically, as shown in Fig. 2, during voltage-withstand test, inductance L2-B does not receive switching signal, relay K2's
First end and second end is off, and discharge tube FDG1 and the first varistor MOV1, the second varistor MOV2 are disconnected,
Discharge tube FDG1 is in not on-state, is not had an impact to voltage-withstand test.In course of normal operation, external circuit output one
Switching signal, the switching signal are transmitted to the 5th end of relay K2 after inductance L2-B by diode D1, and relay K2 is closed
It closes, at this point, the first end and second end short circuit of relay K2；When meeting with lightning stroke, the first varistor MOV1, the second pressure-sensitive electricity
Hinder MOV2, the resistance value moment of the 4th varistor MOV4 becomes smaller, the inside discharge tube FDG1 instantaneous short circuit, to the generation that will be struck by lightning
Instantaneous pressure is released to rapidly ground, effective protection late-class circuit.
Further, the lightning protection circuit that can be used for voltage-withstand test of the utility model can also include protection circuit 13, protect
Protection circuit 13 is connected between firewire and the first end for varistor 11 of connecting.
Optionally, protection circuit 13 includes protector F1, and the one end protector F1 connect with firewire, the protector F1 other ends and
The first end connection of series connection varistor 11.
Low-pressure type discharge tube can be selected in the lightning protection circuit of the utility model, after being substantially reduced using low-pressure type discharge tube
The residual voltage of grade circuit, late-class circuit can be preferably operated in the working environment of a safety, and by discharge tube and pressure
Switching circuit is set between quick resistance, only the discharge tube of low-pressure type need to be selected both can substantially to enhance lightning protection grade, effective protection
Late-class circuit can also be such that the lightning protection circuit is not limited by voltage-withstand test.
A kind of driving power has also been constructed in the utility model, which can be LED drive power or other photographs
The driving power of bright class, wherein the driving power is internally provided with the above-mentioned lightning protection circuit that can be used for voltage-withstand test.By driving
The above-mentioned lightning protection circuit that can be used for voltage-withstand test is arranged in dynamic power source internal, both can substantially enhance the lightning protection grade of driving power,
The late-class circuit of effective protection power source internal can also be such that the driving power is not limited by voltage-withstand test.
Above example is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should all belong to the utility model claims covers model
It encloses.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of lightning protection circuit can be used for voltage-withstand test, which is characterized in that including：Series connection varistor and discharge circuit；
The first end of the series connection varistor accesses firewire, and the second end of the series connection varistor connects with the discharge circuit
It connects, the third of the series connection varistor is terminated into zero curve；The discharge circuit is also respectively connected with the firewire and protecting field；
Meet with lightning stroke when, it is described series connection varistor and the discharging circuit conduction and by lightning stroke generate high voltage relief to protect
Ground.
2. the lightning protection circuit according to claim 1 that can be used for voltage-withstand test, which is characterized in that the series connection varistor
Including：4th varistor MOV4 and the second varistor MOV2；
The first end of the 4th varistor MOV4 is connected to the firewire as the first end of the series connection varistor, institute
The second end for stating the 4th varistor MOV4 passes through the second varistor MOV2 connections discharge circuit, the 4th pressure
Quick resistance MOV4 is connected with the end that is connected in series with of the second varistor MOV2 as the third end of the series connection varistor
To the zero curve；
The connecting pin that the second varistor MOV2 is connect with the discharge circuit is the second end of the series connection varistor.
3. the lightning protection circuit according to claim 2 that can be used for voltage-withstand test, which is characterized in that the discharge circuit packet
It includes：First varistor MOV1, switching circuit and discharge tube FDG1；
The first end of the first varistor MOV1 accesses the firewire, the second end of the first varistor MOV1 and institute
Switching circuit connection is stated, the switching circuit also connects protecting field by the discharge tube FDG1；
The end that is connected in series with of the first varistor MOV1 and the switching circuit also connect with the second varistor MOV2
It connects.
4. the lightning protection circuit according to claim 3 that can be used for voltage-withstand test, which is characterized in that the switching circuit packet
It includes：Turning circuit and second switch；
Described turning circuit one end is connect with the external circuit for providing switching signal, and the turning circuit other end passes through described the
Two switches are respectively connected to the second end of the first varistor MOV1 and the discharge tube FDG1.
5. the lightning protection circuit according to claim 4 that can be used for voltage-withstand test, which is characterized in that the second switch includes
Relay, the relay include first end, second end, the 5th end and the 6th end；
The first end of the relay connects protecting field, the second end of the relay and described first by the discharge tube FDG1
The second end of varistor MOV1 connects, and the 5th end of the relay is connected to the turning circuit, and the of the relay
Six ends are grounded.
6. the lightning protection circuit according to claim 5 that can be used for voltage-withstand test, which is characterized in that the turning circuit includes
Inductance L2-B and diode D1；
The one end the inductance L2-B is connect with the external circuit, the anode of the inductance L2-B other ends and the diode D1
Connection, the cathode of the diode D1 are connect with the 5th end of the relay.
7. the lightning protection circuit according to claim 1 that can be used for voltage-withstand test, which is characterized in that further include protection circuit,
The protection circuit is connected between the firewire and the first end of the varistor of connecting.
8. the lightning protection circuit according to claim 7 that can be used for voltage-withstand test, which is characterized in that the protection circuit includes
Protector F1, the one end the protector F1 are connect with the firewire, the protector F1 other ends and the varistor of connecting
First end connection.
9. the lightning protection circuit according to claim 3 that can be used for voltage-withstand test, which is characterized in that the discharge tube FDG1 is
Gas-discharge tube.
10. a kind of driving power, which is characterized in that can be used for the anti-of voltage-withstand test including claim 1-9 any one of them
Thunder and lightning road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820225784.1U CN208015361U (en) | 2018-02-08 | 2018-02-08 | A kind of lightning protection circuit and driving power can be used for voltage-withstand test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820225784.1U CN208015361U (en) | 2018-02-08 | 2018-02-08 | A kind of lightning protection circuit and driving power can be used for voltage-withstand test |
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| Publication Number | Publication Date |
|---|---|
| CN208015361U true CN208015361U (en) | 2018-10-26 |
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ID=63885326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820225784.1U Active CN208015361U (en) | 2018-02-08 | 2018-02-08 | A kind of lightning protection circuit and driving power can be used for voltage-withstand test |
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| Country | Link |
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| CN (1) | CN208015361U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115219807A (en) * | 2021-04-20 | 2022-10-21 | 上海铁路通信有限公司 | Lightning protection test and insulation test compatible circuit and electronic equipment |
| CN117543523A (en) * | 2023-12-16 | 2024-02-09 | 广东东菱电源科技有限公司 | Lightning stroke low residual voltage output circuit |
-
2018
- 2018-02-08 CN CN201820225784.1U patent/CN208015361U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115219807A (en) * | 2021-04-20 | 2022-10-21 | 上海铁路通信有限公司 | Lightning protection test and insulation test compatible circuit and electronic equipment |
| CN117543523A (en) * | 2023-12-16 | 2024-02-09 | 广东东菱电源科技有限公司 | Lightning stroke low residual voltage output circuit |
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