CN207251200U - A kind of protection circuit of smart home power supply lightning surge - Google Patents
A kind of protection circuit of smart home power supply lightning surge Download PDFInfo
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- CN207251200U CN207251200U CN201720664899.6U CN201720664899U CN207251200U CN 207251200 U CN207251200 U CN 207251200U CN 201720664899 U CN201720664899 U CN 201720664899U CN 207251200 U CN207251200 U CN 207251200U
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- varistor
- smart home
- power supply
- lightning surge
- protection circuit
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Abstract
The utility model discloses a kind of protection circuit of smart home power supply lightning surge, including the first varistor, the second varistor and thermistor being connected in series between firewire and zero curve, the first end of first varistor is connected with firewire, and second end is connected with gas-discharge tube；The first end of second varistor is connected with the second end of the first varistor, and second end is connected with zero curve；The thermistor is series at the second end of the second varistor；The protection circuit of the smart home power supply lightning surge is preferably minimized the caused injury that high energy pulse impacts, and protection smart home product will not be damaged because of the impact of lightning surge.
Description
Technical field
It the utility model is related to meter technical field, more particularly to a kind of protection circuit of smart home power supply lightning surge.
Background technology
With widely using for electronic equipment, electronic equipment is damaged by overvoltage and more and more more closed be subject to people
Note, protective capacities requirement of the people to the lightning surge of electronic equipment is higher and higher, and the power supply of almost all of electronic equipment
First of whole electronic equipment is at, so the protective capacities of the lightning surge of power supply seems most important.And now
The protection circuit pulse assimilation effect higher to lightning stroke surge energy of lightning surge be not fine, and easily daily
By high energy pulse impact failure in life, it can not reliably protect smart home product in long-time service by impact failure.
Utility model content
In view of above-mentioned technical problem, the purpose of this utility model is to provide a kind of the anti-of smart home power supply lightning surge
Protection circuit, its caused injury that can be impacted to high energy pulse are preferably minimized, and protection smart home product will not be because of thunder
Hit the impact of surge and be damaged.
The utility model provides a kind of protection circuit of smart home power supply lightning surge, including be connected in series in firewire and
The first varistor, the second varistor and thermistor between zero curve, the first end and firewire of first varistor
Connection, second end are connected with gas-discharge tube；
The first end of second varistor is connected with the second end of the first varistor, and second end is connected with zero curve；
The thermistor is series at the second end of the second varistor.
The basic structure of the protection circuit of the utility model smart home power supply lightning surge is illustrated with reference to the accompanying drawings
Make.
Brief description of the drawings
Fig. 1 is the structure diagram of the protection circuit of this Practical Intelligent household power supply lightning surge.
Embodiment
For clarity of illustration, the protection to smart home power supply lightning surge is electric in an illustrative manner with reference to the accompanying drawings
Road is illustrated.It should be appreciated that the utility model is not intended to be limited thereto.
Embodiment 1
As shown in Figure 1, the protection circuit of the smart home power supply lightning surge of the utility model, the utility model
The protection circuit of smart home power supply lightning surge, including the first varistor MOV1 and the second varistor MOV2, described
One varistor MOV1 and the second varistor MOV2 is series connection, the first varistor MOV1 and the second varistor MOV2's
Maximum feature is when the voltage being added in above it is less than its threshold values " UN ", and it is minimum to flow through its electric current, equivalent to one pass
Dead valve, when voltage is more than UN, its resistance value diminishes, so allow for flowing through its electric current increase sharply and to other circuits
Change is influenced less so as to reducing influence of the overvoltage to follow-up sensitive circuit, can be to be passed through in suppression circuit using this function
The abnormal overvoltage often occurred, protects the circuit from the infringement of overvoltage.
The other end of the first varistor MOV1 is connected with fire-wire interfaces, and firewire L is connected with the fire-wire interfaces,
The other end of the second varistor MOV2 is connected with zero line interface, and zero curve N is connected with the zero line interface.
The 3rd varistor MOV3 is further included, one end of the 3rd varistor MOV3 connects the first varistor MOV1
High voltage end, the other end of the 3rd varistor MOV3 connects the low-voltage end of the second varistor MOV2, the 3rd pressure-sensitive electricity
Resistance MOV3 is connected between firewire-zero curve (L-N), is mainly used for differential mode protection, and common mode protection refers to firewire-ground wire (L-PE), zero
Protection between line-ground wire (N-PE).
The first Y capacitance C5 and the second Y capacitance C6, the first Y capacitance C5 and the second Y capacitance C6 is further included as series connection, institute
The other end for stating the first Y capacitance C5 is connected with the high voltage end of the first varistor MOV1, the other end of the second Y capacitance C6
It is connected with the low-voltage end of the second varistor MOV2.
Further include gas-discharge tube ZV1, one end of the gas-discharge tube ZV1 and the pressures of the first varistor MOV1 and second
The tie point connection of quick resistance MOV2, and the other end ground connection of gas-discharge tube ZV1, when surge voltage is excessive, gas discharge
Pipe ZV1 suppresses surge voltage by discharging generation electric arc, and the first varistor MOV1 of firewire-ground wire (L-PE) series connection is gentle
Connect the second varistor MOV2 and gas-discharge tube ZV1 respectively between body discharge tube ZV1, neutral-ground (N-PE), is mainly used for
Common mode is protected, firewire-ground wire (L-PE) series connection the first varistor MOV1 and gas-discharge tube ZV1, neutral-ground (N-PE)
Between connect respectively the second varistor MOV2 and gas-discharge tube ZV1, be mainly used for common mode protection, common mode protection refers to firewire-zero
Line (L-N) is protected.
The junction of the first Y capacitance C5 and the second Y capacitance C6 are grounded.
Further include one end connection the of the first differential mode inductance L1 and the second differential mode inductance L2, the first differential mode inductance L1
The first input end of the high voltage end of one varistor MOV1 and its other end connection common mode inductance NF1, the second differential mode electricity
Feel the second input of the low-voltage end and its other end connection common mode inductance NF1 of the second varistor MOV2 of one end connection of L2
End, X capacitances CX1 is also associated between the first input end and the second input terminal of common mode inductance NF1.
The first output terminal and the second output terminal of the common mode inductance NF1 is connected respectively on firewire L and zero curve N.
The high voltage end of the first varistor MOV1 is equipped with protective tube FUSE with firewire L junctions, under normal circumstances,
Protective tube FUSE plays connection circuit function in circuit, and when being initially powered or extraneous surge current is incoming, protective tube FUSE leads to
Cross itself fusing safety cut-off and protect circuit, low-voltage end and the zero curve N junctions of the second varistor MOV2 are equipped with
Before not being powered, resistance value is very big by thermistor NTC, the thermistor NTC of negative temperature coefficient, can be into so when being initially powered
The suppression surge current of work(；It is powered after entering stable state, the temperature rise of thermistor NTC, the resistance value of thermistor NTC becomes very
It is small, it can be ignored substantially；Influence to whole circuit can be ignored.
The utility model compared with prior art, the advantage is that：First varistor MOV1 and the second varistor
MOV2 is series connection, and the other end of the first varistor MOV1 is connected with fire-wire interfaces, is connected with firewire L in fire-wire interfaces, second
The other end of varistor MOV2 is connected with zero line interface, and zero curve N is connected with zero line interface, the 3rd varistor MOV3's
One end connects the high voltage end of the first varistor MOV1, and the other end of the 3rd varistor MOV3 connects the second varistor
The low-voltage end of MOV2, can rush high energy pulse by the effect of the first varistor MOV1 and the second varistor MOV2
The caused injury hit is preferably minimized, and protection smart home product will not be damaged because of the impact of lightning surge.
The preferred embodiment of the utility model is clearly stated above with reference to attached drawing, it is understood, however, that the utility model
It is not intended to be limited thereto.For those skilled in the art, the present invention may have various modifications and changes.It is all in this reality
Within new spirit and principle, any modification, equivalent replacement, improvement and so on, should be included in the utility model
Within right.
Claims (9)
- A kind of 1. protection circuit of smart home power supply lightning surge, it is characterised in that：Including being connected in series in firewire and zero curve Between the first varistor, the second varistor and thermistor, the first end of first varistor is connected with firewire, Second end is connected with gas-discharge tube；The first end of second varistor is connected with the second end of the first varistor, and second end is connected with zero curve；The thermistor is series at the second end of the second varistor.
- 2. the protection circuit of smart home power supply lightning surge according to claim 1, it is characterised in that：Further include the 3rd Varistor, the 3rd varistor are connected with firewire and zero curve respectively, first varistor, the second varistor with 3rd varistor is parallel relationship.
- 3. the protection circuit of smart home power supply lightning surge according to claim 2, it is characterised in that：Further include first Y capacitance and the second Y capacitance, the first Y capacitance first end are connected with firewire, and second end is connected with gas-discharge tube；The second Y capacitance first end is connected with the second end of the first Y capacitance, and second end is connected with zero curve.
- 4. the protection circuit of smart home power supply lightning surge according to claim 3, it is characterised in that：The gas is put The second end with the first varistor, the second end of the first Y capacitance are connected fulgurite first end respectively, and second end is connected with ground wire.
- 5. the protection circuit of smart home power supply lightning surge according to claim 4, it is characterised in that：Further include series connection In firewire the first differential mode inductance and be series at the second differential mode inductance of zero curve.
- 6. the protection circuit of smart home power supply lightning surge according to claim 5, it is characterised in that：Further include series connection In firewire and the X capacitances of zero curve.
- 7. the protection circuit of smart home power supply lightning surge according to claim 6, it is characterised in that：Further include series connection In firewire and the common mode inductance of zero curve.
- 8. the protection circuit of smart home power supply lightning surge according to claim 7, it is characterised in that：The firewire Output terminal is connected with direct voltage output cathode, and the output terminal of the zero curve is connected with direct voltage output anode.
- 9. the protection circuit of smart home power supply lightning surge according to claim 8, it is characterised in that：First pressure The junction of quick resistance and firewire is equipped with protective tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720664899.6U CN207251200U (en) | 2017-06-09 | 2017-06-09 | A kind of protection circuit of smart home power supply lightning surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720664899.6U CN207251200U (en) | 2017-06-09 | 2017-06-09 | A kind of protection circuit of smart home power supply lightning surge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207251200U true CN207251200U (en) | 2018-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720664899.6U Active CN207251200U (en) | 2017-06-09 | 2017-06-09 | A kind of protection circuit of smart home power supply lightning surge |
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| Country | Link |
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| CN (1) | CN207251200U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767829A (en) * | 2018-08-09 | 2018-11-06 | 茂硕科技有限公司 | A kind of surging protection circuit |
| CN109268761A (en) * | 2018-08-17 | 2019-01-25 | 芜湖左舒电子商务有限公司 | A kind of solar lighting street lamp |
| CN112531668A (en) * | 2019-09-17 | 2021-03-19 | 青岛海尔空调电子有限公司 | Surge absorption circuit for single-phase air conditioning system |
| CN114243662A (en) * | 2021-11-01 | 2022-03-25 | 南方电网数字电网研究院有限公司 | VFTO anti-interference circuit and switching device |
-
2017
- 2017-06-09 CN CN201720664899.6U patent/CN207251200U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767829A (en) * | 2018-08-09 | 2018-11-06 | 茂硕科技有限公司 | A kind of surging protection circuit |
| CN109268761A (en) * | 2018-08-17 | 2019-01-25 | 芜湖左舒电子商务有限公司 | A kind of solar lighting street lamp |
| CN112531668A (en) * | 2019-09-17 | 2021-03-19 | 青岛海尔空调电子有限公司 | Surge absorption circuit for single-phase air conditioning system |
| CN114243662A (en) * | 2021-11-01 | 2022-03-25 | 南方电网数字电网研究院有限公司 | VFTO anti-interference circuit and switching device |
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