CN103779859A - Protective circuit for surge voltage of electrical network - Google Patents
Protective circuit for surge voltage of electrical network Download PDFInfo
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- CN103779859A CN103779859A CN201310753928.2A CN201310753928A CN103779859A CN 103779859 A CN103779859 A CN 103779859A CN 201310753928 A CN201310753928 A CN 201310753928A CN 103779859 A CN103779859 A CN 103779859A
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- 230000001681 protective effect Effects 0.000 title claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000004065 semiconductor Substances 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 19
- 230000005669 field effect Effects 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 230000007547 defect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The present invention discloses a protective circuit for surge voltage of an electrical network, which comprises the components of: a differential-mode filtering circuit which is connected with a rectifying bridge, a MOS tube which is connected with a switching power supply, a peripheral protecting circuit, and a TVS voltage-limiting and failure-protecting circuit. The differential-mode filtering circuit is connected with the MOS tube, the peripheral protecting circuit and the TVS voltage-limiting and failure-protecting circuit respectively. The MOS tube and the peripheral protecting circuit are connected with the TVS voltage-limiting and failure-protecting circuit. The protective circuit can prevent surge voltage impact of the electrical network.
Description
Technical field
The present invention relates to terminal technology field, is specifically a kind of protection circuit of electrical network surge voltage.
Background technology
Terminal mainly refers to the system class terminals such as special transformer terminals, distribution transformer terminals.The rectifier bridge of prior art terminal and Switching Power Supply are direct-connected.There is following defect in the terminal of this structure: because the power utilization environment of terminal is severe in actual use procedure, as thunder and lightning, large-scale inductive load access or disconnection and partial electric grid resonance etc., these all can produce electrical network surge voltage, these surge voltages comprise moment high voltage surge and the long-time high pressure that continues type, and it is far away higher than high-voltage capacitance withstand voltage and the Switching Power Supply power MOS pipe withstand voltage of Switching Power Supply.And rectifier bridge and Switching Power Supply be owing to being direct-connected, the electrical network surge voltage of therefore being carried by rectifier bridge will inevitably cause the damage of Switching Power Supply.Therefore need a kind of protection circuit of the electrical network surge voltage that can prevent the impact of electrical network surge voltage, to address the above problem.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the defect of above prior art, and a kind of protection circuit that can prevent the electrical network surge voltage that electrical network surge voltage impacts is provided.
Technical scheme of the present invention is, a kind of protection circuit of electrical network surge voltage is provided, and comprises the differential mode filter circuit being connected with rectifier bridge, the metal-oxide-semiconductor being connected with Switching Power Supply and peripheral protective circuit and TVS pressure limiting and fail-safe circuit; Described differential mode filter circuit is also connected with metal-oxide-semiconductor and peripheral protective circuit, TVS pressure limiting and fail-safe circuit respectively; Described metal-oxide-semiconductor and peripheral protective circuit are also connected with TVS pressure limiting and fail-safe circuit.
Described differential mode filter circuit comprises a capacitor C 2 and two filtering that are connected with rectifier bridge and discharge circuit, and the two ends of described capacitor C 2 are connected with the output of two filtering and discharge circuit respectively.
Described filtering and discharge circuit comprise resistance and the inductance that two one end are connected, and the other end of described two resistance is connected with the two ends of inductance respectively.
Described metal-oxide-semiconductor and peripheral protective circuit comprise fly-wheel diode VD1, peak absorbing capacitor C 1, field effect transistor V1, voltage stabilizing didoe VD2 and resistance R 5, R6, R7, R8; One end of described resistance R 5 is all connected with the d utmost point of field effect transistor V1, one end of peak absorbing capacitor C 1, the negative electrode of fly-wheel diode VD1, and one end of described resistance R 5 is the input of metal-oxide-semiconductor and peripheral protective circuit; The other end of described resistance R 5 is connected with one end of resistance R 6, resistance R 7 and resistance R 8 successively; The s utmost point of described field effect transistor V1 is all connected with the anode of the other end of peak absorbing capacitor C 1, fly-wheel diode VD1, the anode of voltage stabilizing didoe VD2, and the s of described field effect transistor V1 is the output head anode of the protection circuit of electrical network surge voltage very; The g utmost point of described field effect transistor V1 is connected with the other end, TVS pressure limiting and the fail-safe circuit of the negative electrode of voltage stabilizing didoe VD2, resistance R 8.
Described TVS pressure limiting and fail-safe circuit comprise resistance R 9, R10, R11, R12 and TVS diode TVS1, TVS2; One end of described resistance R 9 is connected with metal-oxide-semiconductor and peripheral protective circuit; The other end of described resistance R 9 is connected with one end of resistance R 10, resistance R 11 and resistance R 12 successively; The other end of described resistance R 12 is connected with the negative electrode of TVS diode TVS1; The anode of described TVS diode TVS1 is connected with the negative electrode of TVS diode TVS2; The anode of described TVS diode TVS1 is connected with differential mode filter circuit, and the anode of described TVS diode TVS1 is the negative pole of output end of the protection circuit of electrical network surge voltage.
Adopt after above structure, the present invention compared with prior art, has the following advantages:
The protection circuit of electrical network surge voltage of the present invention is provided in a side of between rectifier bridge and Switching Power Supply, the electrical network surge voltage of being carried by rectifier bridge like this can be suppressed, cut down and eliminate by this circuit, thereby avoid impacting Switching Power Supply, and then guarantee the normal work of terminal.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the protection circuit of electrical network surge voltage of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the protection circuit of a kind of electrical network surge voltage of the present invention, comprises the differential mode filter circuit being connected with rectifier bridge, the metal-oxide-semiconductor being connected with Switching Power Supply and peripheral protective circuit and TVS pressure limiting and fail-safe circuit; In Fig. 1, what square frame 1 represented is differential mode filter circuit, and what square frame 2 represented is metal-oxide-semiconductor and peripheral protective circuit, and what square frame 3 represented is TVS pressure limiting and fail-safe circuit; The input that is differential mode filter circuit is connected with rectifier bridge, and the output of output, TVS pressure limiting and the fail-safe circuit of metal-oxide-semiconductor and peripheral protective circuit is connected with Switching Power Supply.Described differential mode filter circuit is also connected with metal-oxide-semiconductor and peripheral protective circuit, TVS pressure limiting and fail-safe circuit respectively; Described metal-oxide-semiconductor and peripheral protective circuit are also connected with TVS pressure limiting and fail-safe circuit.
Described differential mode filter circuit comprises a capacitor C 2 and two filtering that are connected with rectifier bridge and discharge circuit, and the two ends of described capacitor C 2 are connected with the output of two filtering and discharge circuit respectively.
Described filtering and discharge circuit comprise resistance and the inductance that two one end are connected, the other end of described two resistance is connected with the two ends of inductance respectively, in the present embodiment, the first filtering and discharge circuit are made up of resistance R 1, R2, inductance L 1, one end of resistance R 1 is connected with one end of resistance R 2, the other end of resistance R 1 is connected with one end of inductance L 1, and the other end of resistance R 2 is connected with the other end of inductance L 1, one end of capacitor C 2; The second filtering and discharge circuit are made up of resistance R 3, R4, inductance L 2, and one end of resistance R 3 is connected with one end of resistance R 4, and the other end of resistance R 3 is connected with one end of inductance L 2, and the other end of resistance R 4 is connected with the other end of inductance L 2, the other end of capacitor C 2.The plug-in unit inductance that the inductance value of selecting is 1mH.
Described metal-oxide-semiconductor and peripheral protective circuit comprise fly-wheel diode VD1, peak absorbing capacitor C 1, field effect transistor V1, voltage stabilizing didoe VD2 and resistance R 5, R6, R7, R8; One end of described resistance R 5 is all connected with the d utmost point of field effect transistor V1, one end of peak absorbing capacitor C 1, the negative electrode of fly-wheel diode VD1, and one end of described resistance R 5 is the input of metal-oxide-semiconductor and peripheral protective circuit; The other end of described resistance R 5 is connected with one end of resistance R 6, resistance R 7 and resistance R 8 successively; The s utmost point of described field effect transistor V1 is all connected with the anode of the other end of peak absorbing capacitor C 1, fly-wheel diode VD1, the anode of voltage stabilizing didoe VD2, and the s of described field effect transistor V1 is the output head anode of the protection circuit of electrical network surge voltage very; The g utmost point of described field effect transistor V1 is connected with the other end, TVS pressure limiting and the fail-safe circuit of the negative electrode of voltage stabilizing didoe VD2, resistance R 8.The model of fly-wheel diode VD1 is IN4007; Peak absorbing capacitor C 1 is ceramic disc capacitor; The model of field effect transistor V1 is IRFPG50.
Described TVS pressure limiting and fail-safe circuit comprise resistance R 9, R10, R11, R12 and TVS diode TVS1, TVS2; One end of described resistance R 9 is connected with metal-oxide-semiconductor and peripheral protective circuit; The other end of described resistance R 9 is connected with one end of resistance R 10, resistance R 11 and resistance R 12 successively; The other end of described resistance R 12 is connected with the negative electrode of TVS diode TVS1; The anode of described TVS diode TVS1 is connected with the negative electrode of TVS diode TVS2; The anode of described TVS diode TVS1 is connected with differential mode filter circuit, and the anode of described TVS diode TVS1 is the negative pole of output end of the protection circuit of electrical network surge voltage.The model of TVS diode TVS1, TVS diode TVS is SMBJ250A.
Below be only described with regard to most preferred embodiment of the present invention, but can not be interpreted as it is limitations on claims.The present invention is not limited only to above embodiment, and its concrete structure allows to change.All various variations of doing in the protection range of independent claims of the present invention are all in protection scope of the present invention.
Claims (5)
1. a protection circuit for electrical network surge voltage, is characterized in that: comprise the differential mode filter circuit being connected with rectifier bridge, the metal-oxide-semiconductor being connected with Switching Power Supply and peripheral protective circuit and TVS pressure limiting and fail-safe circuit; Described differential mode filter circuit is also connected with metal-oxide-semiconductor and peripheral protective circuit, TVS pressure limiting and fail-safe circuit respectively; Described metal-oxide-semiconductor and peripheral protective circuit are also connected with TVS pressure limiting and fail-safe circuit.
2. the protection circuit of electrical network surge voltage according to claim 1, it is characterized in that: described differential mode filter circuit comprises a capacitor C 2 and two filtering that are connected with rectifier bridge and discharge circuit, the two ends of described capacitor C 2 are connected with the output of two filtering and discharge circuit respectively.
3. the protection circuit of electrical network surge voltage according to claim 2, is characterized in that: described filtering and discharge circuit comprise resistance and the inductance that two one end are connected, and the other end of described two resistance is connected with the two ends of inductance respectively.
4. the protection circuit of electrical network surge voltage according to claim 1, is characterized in that: described metal-oxide-semiconductor and peripheral protective circuit comprise fly-wheel diode VD1, peak absorbing capacitor C 1, field effect transistor V1, voltage stabilizing didoe VD2 and resistance R 5, R6, R7, R8; One end of described resistance R 5 is all connected with the d utmost point of field effect transistor V1, one end of peak absorbing capacitor C 1, the negative electrode of fly-wheel diode VD1, and one end of described resistance R 5 is the input of metal-oxide-semiconductor and peripheral protective circuit; The other end of described resistance R 5 is connected with one end of resistance R 6, resistance R 7 and resistance R 8 successively; The s utmost point of described field effect transistor V1 is all connected with the anode of the other end of peak absorbing capacitor C 1, fly-wheel diode VD1, the anode of voltage stabilizing didoe VD2, and the s of described field effect transistor V1 is the output head anode of the protection circuit of electrical network surge voltage very; The g utmost point of described field effect transistor V1 is connected with the other end, TVS pressure limiting and the fail-safe circuit of the negative electrode of voltage stabilizing didoe VD2, resistance R 8.
5. the protection circuit of electrical network surge voltage according to claim 1, is characterized in that: described TVS pressure limiting and fail-safe circuit comprise resistance R 9, R10, R11, R12 and TVS diode TVS1, TVS2; One end of described resistance R 9 is connected with metal-oxide-semiconductor and peripheral protective circuit; The other end of described resistance R 9 is connected with one end of resistance R 10, resistance R 11 and resistance R 12 successively; The other end of described resistance R 12 is connected with the negative electrode of TVS diode TVS1; The anode of described TVS diode TVS1 is connected with the negative electrode of TVS diode TVS2; The anode of described TVS diode TVS1 is connected with differential mode filter circuit, and the anode of described TVS diode TVS1 is the negative pole of output end of the protection circuit of electrical network surge voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753928.2A CN103779859B (en) | 2013-12-31 | 2013-12-31 | The protection circuit of electrical network surge voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753928.2A CN103779859B (en) | 2013-12-31 | 2013-12-31 | The protection circuit of electrical network surge voltage |
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| CN103779859A true CN103779859A (en) | 2014-05-07 |
| CN103779859B CN103779859B (en) | 2016-08-17 |
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| CN201310753928.2A Active CN103779859B (en) | 2013-12-31 | 2013-12-31 | The protection circuit of electrical network surge voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890320A (en) * | 2021-11-10 | 2022-01-04 | 欧普照明股份有限公司 | A control circuit and lighting device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6272025B1 (en) * | 1999-10-01 | 2001-08-07 | Online Power Supply, Inc. | Individual for distributed non-saturated magnetic element(s) (referenced herein as NSME) power converters |
| CN102014557A (en) * | 2010-10-19 | 2011-04-13 | 王子能 | LED dimming power supply |
| CN202872356U (en) * | 2012-09-26 | 2013-04-10 | 深圳市振华微电子有限公司 | Surge suppression circuit |
| CN203166497U (en) * | 2013-01-22 | 2013-08-28 | 广州金升阳科技有限公司 | Anti-surge DC protective circuit |
| CN203734301U (en) * | 2013-12-31 | 2014-07-23 | 宁波三星电气股份有限公司 | Power grid surge voltage protection circuit |
-
2013
- 2013-12-31 CN CN201310753928.2A patent/CN103779859B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6272025B1 (en) * | 1999-10-01 | 2001-08-07 | Online Power Supply, Inc. | Individual for distributed non-saturated magnetic element(s) (referenced herein as NSME) power converters |
| CN102014557A (en) * | 2010-10-19 | 2011-04-13 | 王子能 | LED dimming power supply |
| CN202872356U (en) * | 2012-09-26 | 2013-04-10 | 深圳市振华微电子有限公司 | Surge suppression circuit |
| CN203166497U (en) * | 2013-01-22 | 2013-08-28 | 广州金升阳科技有限公司 | Anti-surge DC protective circuit |
| CN203734301U (en) * | 2013-12-31 | 2014-07-23 | 宁波三星电气股份有限公司 | Power grid surge voltage protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890320A (en) * | 2021-11-10 | 2022-01-04 | 欧普照明股份有限公司 | A control circuit and lighting device |
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| CN103779859B (en) | 2016-08-17 |
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Effective date of registration: 20150513 Address after: 315034 Ningbo, Jiangbei District, Zhejiang City, the town of Maple Bay Road, No. 16 Applicant after: Ningbo Samsung intelligent electric company limited Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Applicant before: Ningbo Sanxing Electric Co., Ltd. |
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Effective date of registration: 20160129 Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Applicant after: NINGBO SANXING MEDICAL ELECTRIC CO., LTD. Address before: 315034 Ningbo, Jiangbei District, Zhejiang City, the town of Maple Bay Road, No. 16 Applicant before: Ningbo Samsung intelligent electric company limited |
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Effective date of registration: 20210809 Address after: No.16 Fengwan Road, Cicheng Town, Jiangbei District, Ningbo City, Zhejiang Province Patentee after: NINGBO SANXING SMART ELECTRIC Co.,Ltd. Address before: 315191 Yinzhou Industrial Park, Ningbo City, Zhejiang Province (Jiangshan Town, Yinzhou District, Ningbo City) Patentee before: NINGBO SANXING ELECTRIC Co.,Ltd. |