CN110601162A - Common mode surge protection circuit - Google Patents
Common mode surge protection circuit Download PDFInfo
- Publication number
- CN110601162A CN110601162A CN201910865129.1A CN201910865129A CN110601162A CN 110601162 A CN110601162 A CN 110601162A CN 201910865129 A CN201910865129 A CN 201910865129A CN 110601162 A CN110601162 A CN 110601162A
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- China
- Prior art keywords
- discharge tube
- unit
- surge protection
- protection circuit
- voltage
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- 239000007787 solid Substances 0.000 claims abstract description 39
- 230000001419 dependent effect Effects 0.000 claims abstract description 18
- 230000007935 neutral effect Effects 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The embodiment of the invention provides a common-mode surge protection circuit, which comprises a piezoresistor unit, a gas discharge tube, a divider resistor unit and a solid discharge tube unit; the voltage-dependent resistor unit is used for being connected with a live wire and a zero line respectively, the gas discharge tube is connected with the voltage-dependent resistor unit and the solid discharge tube unit respectively, the voltage-dependent resistor unit is connected with the gas discharge tube in parallel, and the solid discharge tube unit is grounded; the voltage dividing resistance unit comprises at least one voltage dividing resistance; the solid discharge tube unit includes at least one solid discharge tube. The common-mode surge protection circuit provided by the embodiment of the invention can simultaneously meet the requirements of lightning surge protection and safety and voltage resistance.
Description
Technical Field
The invention relates to a surge protection technology, in particular to a common-mode surge protection circuit.
Background
A surge (Electrical surging) is also called a surge, and refers to a transient overvoltage on an Electrical device that exceeds a normal operating voltage. In essence, a surge is a sharp pulse that occurs in only a few millionths of a second. The reasons for the occurrence of the surge include internal causes such as the start and stop of electrical equipment, malfunction, and the like, and external causes such as lightning, and the like.
The outdoor power supply is relatively harsh in use environment, the power supply is poor due to power grid interference and lightning surge, so that the lightning surge protection level of the power supply is very important, and a common mode circuit of a conventional power supply is formed by connecting a piezoresistor and a discharge tube in series.
The class 1 power supply requires safety distance, input (L, N) requires to carry out withstand voltage test on Ground (GND), because the impedance of the discharge tube is much larger than voltage-dependent impedance, the test voltage is basically applied to two ends of the discharge tube, if the breakdown voltage of the discharge tube is too low, breakdown is easy during withstand voltage test; if the breakdown voltage of the discharge tube is high, the residual voltage is high during lightning surge test, and the power supply is easy to damage.
Disclosure of Invention
The embodiment of the invention provides a common mode surge protection circuit, which aims to solve the problem that the existing common mode surge protection circuit is difficult to meet the requirements of lightning surge protection and safety and voltage resistance at the same time.
The embodiment of the invention provides a common-mode surge protection circuit, which comprises a piezoresistor unit, a gas discharge tube, a divider resistor unit and a solid discharge tube unit; the voltage dependent resistor unit is used for being connected with a live wire and a zero line respectively, the gas discharge tube is connected with the voltage dependent resistor unit and the solid discharge tube unit respectively, the voltage dependent resistor unit is connected with the gas discharge tube in parallel, and the solid discharge tube unit is grounded; the voltage dividing resistance unit comprises at least one voltage dividing resistance; the solid discharge tube unit includes at least one solid discharge tube.
According to a further technical scheme, the voltage dependent resistor unit comprises a first voltage dependent resistor, and the first voltage dependent resistor is connected with the gas discharge tube and used for being connected with a zero line.
The further technical scheme is that the voltage dependent resistor unit comprises a second voltage dependent resistor, and the second voltage dependent resistor is connected with the gas discharge tube and used for being connected with a live wire.
The further technical scheme is that the voltage dividing resistance unit comprises a plurality of voltage dividing resistances connected in series.
The further technical scheme is that the voltage dividing resistance unit comprises a plurality of voltage dividing resistances connected in parallel.
The solid discharge tube unit comprises a plurality of solid discharge tubes connected in series.
The solid discharge tube unit comprises a plurality of solid discharge tubes connected in parallel.
The common mode surge protection circuit further comprises a safety unit, and the safety unit is arranged in a live wire.
The common mode surge protection circuit further comprises a safety unit, wherein the safety unit is arranged in the live wire and is connected with the second piezoresistor in series.
The further technical scheme is that the fuse unit is a fuse.
According to the technical scheme, compared with a gas discharge tube, the solid discharge tube has the characteristics of accurate conduction, quick response, strong surge absorption capacity, bidirectional symmetry, high reliability and the like, and the solid discharge tube is firstly conducted and then conducted during lightning stroke test, so that a device with lower switching voltage can be selected, and the effect of reducing residual voltage is achieved. During the withstand voltage test, because the impedance matching of the piezoresistor unit, the divider resistor and the solid discharge tube, the voltage applied to the gas discharge tube is reduced, and the insulation breakdown can not be caused. Therefore, the common-mode surge protection circuit provided by the embodiment of the invention can simultaneously meet the requirements of lightning surge protection and safety and voltage resistance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of a common mode surge protection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, wherein like reference numerals represent like elements in the drawings. It is apparent that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. As used in the description of embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Referring to fig. 1, an embodiment of the present invention provides a common mode surge protection circuit, which includes a varistor unit 1, a gas discharge tube GDT, a voltage division resistor unit 2, and a solid discharge tube unit 3.
The voltage dependent resistor unit 1 is used for being connected with live wire L and zero line N respectively, and gas discharge tube GDT is connected with voltage dependent resistor unit 1 and solid discharge tube unit 3 respectively, and divider resistance unit 2 is parallelly connected with gas discharge tube GDT, and solid discharge tube unit 3 ground connection. In the present embodiment, the voltage-dividing resistance unit 2 includes one voltage-dividing resistance R. The solid discharge tube unit 3 includes a solid discharge tube TSS.
According to the technical scheme, compared with a gas discharge tube GDT, the solid discharge tube TSS has the characteristics of accurate conduction, quick response (the response time of the solid discharge tube TSS is nS level, the response time of the gas discharge tube GDT is uS level), strong surge absorption capacity, bidirectional symmetry, high reliability and the like, when a lightning stroke test is carried out, the solid discharge tube TSS is firstly conducted, and the gas discharge tube GDT is then conducted, so that the GDT can select a device with lower switching voltage, and the effect of reducing residual voltage is achieved. During the withstand voltage test, because the three devices impedance matching of piezo-resistor unit 1, divider resistance 2 and solid discharge tube TSS to make the voltage that adds on gas discharge tube GDT reduce, can not lead to insulation breakdown. Therefore, the common-mode surge protection circuit provided by the embodiment of the invention can simultaneously meet the requirements of lightning surge protection and safety and voltage resistance.
With continued reference to fig. 1, in the present embodiment, the varistor unit 1 includes a first varistor RV1 and a second varistor RV 2. A first varistor RV1 is connected to the gas discharge tube GDT and is used for connection to a neutral line N. A second varistor RV2 is connected to the gas discharge tube GDT and is used for connection to the live line L.
Further, the common mode surge protection circuit further comprises an overcurrent protection unit 4, and the overcurrent protection unit 4 is used for being arranged in the live wire L and is connected in series with the second piezoresistor RV 2. Specifically, the overcurrent protection unit 4 is a FUSE. The overcurrent protection unit 4 can avoid overlarge current in the common mode surge protection circuit, and plays a role in overcurrent protection.
It should be noted that, in this embodiment, the voltage dividing resistance unit includes a voltage dividing resistance; the solid discharge tube unit comprises a solid discharge tube. In order to achieve better effect, in other embodiments, the voltage dividing resistance unit may include a plurality of voltage dividing resistances connected in series or in parallel; the solid discharge tube unit may include a plurality of solid discharge tubes connected in series or in parallel to improve the reliability of the common mode surge protection circuit. The above modifications do not depart from the scope of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, while the invention has been described with respect to the above-described embodiments, it will be understood that the invention is not limited thereto but may be embodied with various modifications and changes.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A common mode surge protection circuit is characterized by comprising a piezoresistor unit, a gas discharge tube, a voltage division resistor unit and a solid discharge tube unit; the voltage dependent resistor unit is used for being connected with a live wire and a zero line respectively, the gas discharge tube is connected with the voltage dependent resistor unit and the solid discharge tube unit respectively, the voltage dependent resistor unit is connected with the gas discharge tube in parallel, and the solid discharge tube unit is grounded; the voltage dividing resistance unit comprises at least one voltage dividing resistance; the solid discharge tube unit includes at least one solid discharge tube.
2. A common mode surge protection circuit according to claim 1, wherein said varistor unit comprises a first varistor connected with said gas discharge tube and adapted to be connected with a neutral line.
3. A common mode surge protection circuit according to claim 2, wherein said varistor unit comprises a second varistor connected with said gas discharge tube and adapted to be connected with live line.
4. The common mode surge protection circuit according to claim 1, wherein the voltage dividing resistance unit comprises a plurality of voltage dividing resistances connected in series.
5. The common mode surge protection circuit according to claim 1, wherein the voltage dividing resistance unit comprises a plurality of voltage dividing resistances connected in parallel.
6. The common mode surge protection circuit of claim 1, wherein the solid discharge tube unit comprises a plurality of solid discharge tubes connected in series.
7. The common mode surge protection circuit of claim 1, wherein the solid discharge tube unit comprises a plurality of solid discharge tubes connected in parallel.
8. The common mode surge protection circuit according to claim 1, further comprising a fuse unit configured to be placed in a live line.
9. The common mode surge protection circuit according to claim 3, further comprising a fuse unit for being disposed in a live line and being connected in series with the second varistor.
10. A common mode surge protection circuit according to claim 8 or 9, wherein the fuse unit is a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865129.1A CN110601162A (en) | 2019-09-12 | 2019-09-12 | Common mode surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865129.1A CN110601162A (en) | 2019-09-12 | 2019-09-12 | Common mode surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110601162A true CN110601162A (en) | 2019-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910865129.1A Pending CN110601162A (en) | 2019-09-12 | 2019-09-12 | Common mode surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110601162A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202183600U (en) * | 2011-07-22 | 2012-04-04 | 南京宁普防雷技术有限公司 | Complex type power supply lightning protection device |
| CN108808649A (en) * | 2018-08-31 | 2018-11-13 | 茂硕科技有限公司 | A kind of surging protection circuit |
| CN208638029U (en) * | 2018-08-31 | 2019-03-22 | 茂硕科技有限公司 | A kind of surging protection circuit |
-
2019
- 2019-09-12 CN CN201910865129.1A patent/CN110601162A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202183600U (en) * | 2011-07-22 | 2012-04-04 | 南京宁普防雷技术有限公司 | Complex type power supply lightning protection device |
| CN108808649A (en) * | 2018-08-31 | 2018-11-13 | 茂硕科技有限公司 | A kind of surging protection circuit |
| CN208638029U (en) * | 2018-08-31 | 2019-03-22 | 茂硕科技有限公司 | A kind of surging protection circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191220 |