CN201966600U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
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- CN201966600U CN201966600U CN201020690405XU CN201020690405U CN201966600U CN 201966600 U CN201966600 U CN 201966600U CN 201020690405X U CN201020690405X U CN 201020690405XU CN 201020690405 U CN201020690405 U CN 201020690405U CN 201966600 U CN201966600 U CN 201966600U
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Abstract
The utility model provides a surge protection circuit which comprises a surge differential mode protective circuit and a surge common mode protective circuit, wherein the first end of the surge differential mode protective circuit is connected with a live wire of external alternating current, and the other end of the surge differential mode protective circuit is connected with a zero wire of the external alternating current. The surge common mode protective circuit comprises a first common mode protective circuit and a second common mode protective circuit. In the utility model, the surge differential mode protective circuit is arranged between the live wire and the zero wire of the external alternating current, and the surge common mode protective circuit is arranged between the input end and the output end of a filter circuit, so that the surge protection effect can be effectively achieved, the cost is low and easy implement can be realized.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to a kind of surge protection circuit that is used to protect power supply.
Background technology
When lightning discharge or power circuit connect, disconnecting consumers often regular meeting produce very high overvoltage (or overcurrent), this instantaneous overvoltage (or overcurrent) is called surge voltage (or surge current).Can damage power circuit when surge voltage (or surge current) is excessive, even the load that links to each other with power circuit, as TV etc., thus harm user's life and property safety.Existing surge protection measure is to be connected a piezo-resistance between the live wire of alternating current and zero line.When the voltage at piezo-resistance two ends was lower than its threshold value, its resistance was very big, and the electric current that flows through piezo-resistance is very little; When the voltage at piezo-resistance two ends was higher than its threshold value, the resistance of piezo-resistance was very little, and the electric current that flows through piezo-resistance is very big, thereby suppressed unusual overvoltage and overcurrent.Yet existing surge protection measure has just suppressed the differential mode part of surge, and not obvious to the common mode inhibition partly of surge, reliability is not high.The complex structure of the surge protection circuit of existing differential mode that is used to suppress surge and common mode part, cost is higher.
The utility model content
The utility model purpose is to provide a kind of surge protection circuit, is intended to solve that existing surge protection measure surge suppresses not obvious, reliability is not high, complex structure, cost problem of higher.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of surge protection circuit, comprising:
Surge differential mode protective circuit, its first end links to each other with the live wire of external communication electricity, second end links to each other with the zero line of external communication electricity, first end of described surge differential mode protective circuit also links to each other with the positive input terminal of a filter circuit, and second end of described surge differential mode protective circuit also links to each other with the negative input end of described filter circuit; And
Surge common mode protective circuit; comprise the first common mode protective circuit and the second common mode protective circuit; first end of the described first common mode protective circuit links to each other with the positive input terminal of described filter circuit; second end links to each other with the positive output end of described filter circuit; first end of the described second common mode protective circuit links to each other with the negative input end of described filter circuit, and second end links to each other with the negative output terminal of described filter circuit.
Further, described surge differential mode protective circuit comprises piezo-resistance TNR1, and first end of described piezo-resistance TNR1 is electrically connected with the live wire of external communication electricity, and second end is electrically connected with the zero line of external communication electricity.
Further, described surge differential mode protective circuit also comprises fuse S1, and first end of described piezo-resistance TNR1 links to each other with the live wire of external communication electricity by described fuse S1.
Further, described surge differential mode protective circuit also comprises thermistor RT, and second end of described piezo-resistance TNR1 links to each other with the zero line of external communication electricity by thermistor RT.
Further, described surge differential mode protective circuit also comprises gas discharge tube G3, and first end of described gas discharge tube G3 is electrically connected with described live wire, and second end of described gas discharge tube G3 links to each other with first end of described piezo-resistance TNR1.
Further; the described first common mode protective circuit comprises gas discharge tube G1; first end of described gas discharge tube G1 links to each other with the positive input terminal of described filter circuit; second end is electrically connected with the positive output end of described filter circuit; the described second common mode protective circuit comprises gas discharge tube G2; first end of described gas discharge tube G2 links to each other with the negative input end of described filter circuit, and second end is electrically connected with the negative output terminal of described filter circuit.
Further; the described first common mode protective circuit comprises and also comprises resistance R 1; second end of described gas discharge tube G1 links to each other with the positive output end of described filter circuit by described resistance R 1; the described second common mode protective circuit also comprises resistance R 2, and second end of described gas discharge tube G2 links to each other with the negative output terminal of described filter circuit by described resistance R 2.
Further, described filter circuit comprises first order filter circuit and second level filter circuit, described first order filter circuit comprises capacitor C 3 and common mode inductance L1, described common mode inductance L1 comprises coil La and Lb, first end of coil La is as the positive input terminal of filter circuit, first end of coil Lb is as the negative input end of filter circuit, capacitor C 3 is connected between first end of first end of coil La and coil Lb, second level filter circuit comprises capacitor C 4 and common mode inductance L2, common mode inductance L2 comprises coil Lc and Ld, second end of coil La links to each other with first end of coil Lc, second end of coil Lb links to each other with first end of coil Ld, second end of coil Lc is as the positive output end of filter circuit, second end of coil Ld is as the negative output terminal of filter circuit, and capacitor C 4 is connected between first end of first end of coil Lc and coil Ld.
Further, described filter circuit also comprises safety capacitor C 1 and safety capacitor C 2, and first end of described safety capacitor C 1 links to each other with second end of described coil La, the second end ground connection, first end of described safety capacitor C 2 links to each other with second end of described coil Lb, the second end ground connection.
The utility model surge protection circuit is arranged at surge common mode protective circuit between the input and output of filter circuit by surge differential mode protective circuit being arranged between the live wire and zero line of external communication electricity.Thereby play effectively anti-surge effect, and with low cost, be easy to realize.
Description of drawings
Fig. 1 is the block diagram of the surge protection circuit that provides of the utility model embodiment.
Fig. 2 is the circuit diagram of first better embodiment of the surge protection circuit that provides of the utility model embodiment.
Fig. 3 is the circuit diagram of second better embodiment of the surge protection circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model embodiment; by surge differential mode protective circuit being arranged between the live wire and zero line of external communication electricity, surge common mode protective circuit is arranged between the input and output of filter circuit, thereby plays effectively anti-surge effect; and with low cost, be easy to realize.
Please refer to Fig. 1, the surge protection circuit that the utility model embodiment provides comprises surge differential mode protective circuit 10 and surge common mode protective circuit 20.
First end of surge differential mode protective circuit 10 links to each other with the live wire L of external communication electricity, and second end links to each other with the zero line N of external communication electricity.
First end of surge differential mode protective circuit 10 links to each other with the positive input terminal DI+ of filter circuit 200, and second end of surge differential mode protective circuit 10 links to each other with the negative input end DI-of filter circuit 200.The positive output end DO+ of filter circuit 200 links to each other with the positive input terminal IN+ of voltage conversion circuit 300, and the negative output terminal DO-of filter circuit 200 links to each other with the negative input end IN-of voltage conversion circuit 300.The positive output end OUT+ of voltage conversion circuit 300 and negative output terminal OUT-are used for linking to each other with load circuit (figure does not show).
Surge common mode protective circuit 20 comprises the first common mode protective circuit 21 and the second common mode protective circuit 22.
First end of the first common mode protective circuit 21 links to each other with the positive input terminal DI+ of filter circuit 200, and second end links to each other with the positive output end DO+ of filter circuit 200.
First end of the second common mode protective circuit 22 links to each other with the negative input end DI-of filter circuit 200, and second end links to each other with the negative output terminal DO-of filter circuit 200.
The utility model surge protection circuit is arranged at surge common mode protective circuit 20 between the input and output of filter circuit 200 by surge differential mode protective circuit 10 is arranged between the live wire L and zero line N of external communication electricity.Surge differential mode protective circuit 10 is used for absorbing the differential mode part of surge voltage, and surge common mode protective circuit 20 is used for absorbing the common mode part of surge voltage, thereby plays effectively anti-surge effect, and with low cost, is easy to realize.
Please continue with reference to figure 2, as first preferred embodiment of the present utility model, the surge differential mode protective circuit 10 in the surge protection circuit comprises piezo-resistance TNR1.First end of piezo-resistance TNR1 is electrically connected with the live wire L of external communication electricity, and second end is electrically connected with the zero line N of external communication electricity.
In the present embodiment, the threshold value of piezo-resistance TNR1 is 560V.In other execution modes, in order to adapt to different application circuits and surge degree of protection, the threshold value of piezo-resistance TNR1 also can be not used in restriction the utility model at this for other are worth.
Further, surge differential mode protective circuit 10 also comprises fuse S1, and first end of piezo-resistance TNR1 links to each other with the live wire L of external communication electricity by fuse S1.Fuse S1 is used to prevent that electric current is excessive and burn subsequent conditioning circuit.
Further, surge differential mode protective circuit 10 also comprises thermistor RT, and second end of piezo-resistance TNR1 links to each other with the zero line N of external communication electricity by thermistor RT.Thermistor RT is used to eliminate the peak voltage of external communication electricity.
Please refer to Fig. 3, as second preferred embodiment of the present utility model, the surge differential mode protective circuit 10 in the surge protection circuit also comprises gas discharge tube G3.First end of gas discharge tube G3 links to each other with fuse S1, and second end links to each other with first end of piezo-resistance TNR1.Gas discharge tube G3 is used to strengthen the surge protection effect of surge differential mode protective circuit 10.
First order filter circuit 210 comprises capacitor C 3 and common mode inductance L1.Common mode inductance L1 comprises coil La and Lb.First end of the coil La of common mode inductance L1 is as the positive input terminal DI+ of filter circuit 200, and links to each other with live wire L by fuse S1.First end of the coil Lb of common mode inductance L1 is as the negative input end DI-of filter circuit 200, and links to each other with zero line N by thermistor RT.Capacitor C 3 is connected between first end of first end of coil La and coil Lb.
Second level filter circuit 220 comprises capacitor C 4 and common mode inductance L2.Common mode inductance L2 comprises coil Lc and coil Ld.Second end of the coil La of common mode inductance L1 links to each other with first end of the coil Lc of common mode inductance L 2, and second end of the coil Lb of common mode inductance L1 links to each other with first end of the coil Ld of common mode inductance L 2.Second end of the coil Lc of common mode inductance L2 links to each other with the positive input terminal IN+ of voltage conversion circuit 300 as the positive output end DO+ of filter circuit 200.Second end of the coil Ld of common mode inductance L2 links to each other with the negative input end IN-of voltage conversion circuit 300 as the negative output terminal DO-of filter circuit 200.Capacitor C 4 is connected between first end of first end of coil Lc and coil Ld.
One end of safety capacitor C 1 links to each other other end ground connection with second end of coil La.One end of safety capacitor C 2 links to each other other end ground connection with second end of coil Lb.
As the preferred embodiment of the utility model surge protection circuit, the first common mode protective circuit 21 of surge common mode protective circuit 20 comprises gas discharge tube G1, and the second common mode protective circuit 22 comprises gas discharge tube G2.
First end of gas discharge tube G1 links to each other with first end of the coil La of common mode inductance L 1, and second end is electrically connected with second end of the coil Lc of common mode inductance L 2.
First end of gas discharge tube G2 links to each other with first end of the coil Lb of common mode inductance L 1, and second end is electrically connected with second end of the coil Ld of common mode inductance L 2.
In the present embodiment, the discharge voltage of gas discharge tube G1, gas discharge tube G2 is 240-360V.In other execution modes, in order to adapt to different application circuits and surge degree of protection, the discharge voltage of gas discharge tube G1, gas discharge tube G2 also can be for other be worth, at this not in order to restriction the utility model.
Further, the first common mode protective circuit 21 comprises that also resistance R 1, the second common mode protective circuit 22 also comprises resistance R 2.Second end of gas discharge tube G1 links to each other with second end of the coil Lc of common mode inductance L 2 by resistance R 1.Second end of gas discharge tube G2 links to each other with second end of the coil Ld of common mode inductance L 2 by resistance R 2.Resistance R 1, resistance R 2 are respectively applied for protective gas discharge tube G1, gas discharge tube G2, consume the surge energy of part simultaneously, discharge in the mode of heat energy.
The utility model surge protection circuit is arranged at surge common mode protective circuit 20 between the input and output of filter circuit 200 by surge differential mode protective circuit 10 is arranged between the live wire L and zero line N of external communication electricity.When lightning discharge or connection, disconnecting consumers, producing surge voltage, differential mode part in the surge voltage is absorbed by piezo-resistance TNR1, common mode part in the surge voltage is absorbed by gas discharge tube G1, gas discharge tube G2, thereby play effectively anti-surge effect, and with low cost, be easy to realize.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (9)
1. a surge protection circuit is characterized in that, comprising:
Surge differential mode protective circuit, its first end links to each other with the live wire of external communication electricity, second end links to each other with the zero line of external communication electricity, first end of described surge differential mode protective circuit also links to each other with the positive input terminal of a filter circuit, and second end of described surge differential mode protective circuit also links to each other with the negative input end of described filter circuit; And
Surge common mode protective circuit; comprise the first common mode protective circuit and the second common mode protective circuit; first end of the described first common mode protective circuit links to each other with the positive input terminal of described filter circuit; second end links to each other with the positive output end of described filter circuit; first end of the described second common mode protective circuit links to each other with the negative input end of described filter circuit, and second end links to each other with the negative output terminal of described filter circuit.
2. surge protection circuit as claimed in claim 1; it is characterized in that; described surge differential mode protective circuit comprises piezo-resistance (TNR1), and first end of described piezo-resistance (TNR1) is electrically connected with the live wire of external communication electricity, and second end is electrically connected with the zero line of external communication electricity.
3. surge protection circuit as claimed in claim 2 is characterized in that, described surge differential mode protective circuit also comprises fuse (S1), and first end of described piezo-resistance (TNR1) links to each other with the live wire of external communication electricity by described fuse (S1).
4. surge protection circuit as claimed in claim 2 is characterized in that, described surge differential mode protective circuit also comprises thermistor (RT), and second end of described piezo-resistance (TNR1) links to each other with the zero line of external communication electricity by thermistor (RT).
5. surge protection circuit as claimed in claim 2; it is characterized in that; described surge differential mode protective circuit also comprises gas discharge tube (G3); first end of described gas discharge tube (G3) is electrically connected with described live wire, and second end of described gas discharge tube (G3) links to each other with first end of described piezo-resistance (TNR1).
6. surge protection circuit as claimed in claim 1; it is characterized in that; the described first common mode protective circuit comprises gas discharge tube (G1); first end of described gas discharge tube (G1) links to each other with the positive input terminal of described filter circuit; second end is electrically connected with the positive output end of described filter circuit; the described second common mode protective circuit comprises gas discharge tube (G2); first end of described gas discharge tube (G2) links to each other with the negative input end of described filter circuit, and second end is electrically connected with the negative output terminal of described filter circuit.
7. surge protection circuit as claimed in claim 6; it is characterized in that; the described first common mode protective circuit comprises and also comprises resistance (R1); second end of described gas discharge tube (G1) links to each other with the positive output end of described filter circuit by described resistance (R1); the described second common mode protective circuit also comprises resistance (R2), and second end of described gas discharge tube (G2) links to each other with the negative output terminal of described filter circuit by described resistance (R2).
8. as each described surge protection circuit of claim 1 to 7; it is characterized in that; described filter circuit comprises first order filter circuit and second level filter circuit; described first order filter circuit comprises electric capacity (C3) and common mode inductance (L1); described common mode inductance (L1) comprises that coil (La) reaches (Lb); first end of coil (La) is as the positive input terminal of filter circuit; first end of coil (Lb) is as the negative input end of filter circuit; electric capacity (C3) is connected between first end of first end of coil (La) and coil (Lb); second level filter circuit comprises electric capacity (C4) and common mode inductance (L2); common mode inductance (L2) comprises that coil (Lc) reaches (Ld); second end of coil (La) links to each other with first end of coil (Lc); second end of coil (Lb) links to each other with first end of coil (Ld); second end of coil (Lc) is as the positive output end of filter circuit; second end of coil (Ld) is as the negative output terminal of filter circuit, and electric capacity (C4) is connected between first end of first end of coil (Lc) and coil (Ld).
9. surge protection circuit as claimed in claim 8; it is characterized in that; described filter circuit also comprises safety electric capacity (C1) and safety electric capacity (C2); first end of described safety electric capacity (C1) links to each other with second end of described coil (La); the second end ground connection; first end of described safety electric capacity (C2) links to each other with second end of described coil (Lb), the second end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020690405XU CN201966600U (en) | 2010-12-30 | 2010-12-30 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020690405XU CN201966600U (en) | 2010-12-30 | 2010-12-30 | Surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201966600U true CN201966600U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020690405XU Expired - Fee Related CN201966600U (en) | 2010-12-30 | 2010-12-30 | Surge protection circuit |
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| Country | Link |
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| CN (1) | CN201966600U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639334A (en) * | 2013-11-11 | 2015-05-20 | 研祥智能科技股份有限公司 | Electronic equipment and network interface circuit |
| CN106026634A (en) * | 2016-07-22 | 2016-10-12 | 深圳创维－Rgb电子有限公司 | Anti-electromagnetic interference filtering circuit |
| CN111987921A (en) * | 2020-08-11 | 2020-11-24 | 深圳创维－Rgb电子有限公司 | Switching power supply circuit, television and electronic equipment |
| CN112290521A (en) * | 2020-09-25 | 2021-01-29 | 深圳中科德能科技有限公司 | Surge protection circuit for switch redundant power supply interface |
| CN113471974A (en) * | 2020-03-31 | 2021-10-01 | 成都祥和云端节能设备集团有限公司 | Multifunctional electric system protection circuit |
-
2010
- 2010-12-30 CN CN201020690405XU patent/CN201966600U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639334A (en) * | 2013-11-11 | 2015-05-20 | 研祥智能科技股份有限公司 | Electronic equipment and network interface circuit |
| CN104639334B (en) * | 2013-11-11 | 2019-04-12 | 研祥智能科技股份有限公司 | A kind of electronic equipment and its network interface circuit |
| CN106026634A (en) * | 2016-07-22 | 2016-10-12 | 深圳创维－Rgb电子有限公司 | Anti-electromagnetic interference filtering circuit |
| CN113471974A (en) * | 2020-03-31 | 2021-10-01 | 成都祥和云端节能设备集团有限公司 | Multifunctional electric system protection circuit |
| CN111987921A (en) * | 2020-08-11 | 2020-11-24 | 深圳创维－Rgb电子有限公司 | Switching power supply circuit, television and electronic equipment |
| CN112290521A (en) * | 2020-09-25 | 2021-01-29 | 深圳中科德能科技有限公司 | Surge protection circuit for switch redundant power supply interface |
| CN112290521B (en) * | 2020-09-25 | 2023-06-13 | 深圳中科德能科技有限公司 | Surge protection circuit for redundant power supply interface of switch |
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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 |
Granted publication date: 20110907 Termination date: 20141230 |
|
| EXPY | Termination of patent right or utility model |