CN210273497U - Differential mode surge protection circuit - Google Patents
Differential mode surge protection circuit Download PDFInfo
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- CN210273497U CN210273497U CN201921521165.8U CN201921521165U CN210273497U CN 210273497 U CN210273497 U CN 210273497U CN 201921521165 U CN201921521165 U CN 201921521165U CN 210273497 U CN210273497 U CN 210273497U
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Abstract
The embodiment of the utility model discloses a differential mode surge protection circuit, which comprises a piezoresistor and a pressure relief unit, wherein the piezoresistor and the pressure relief unit are connected in series between a live wire and a zero line; the pressure relief unit comprises a gas discharge tube unit and a voltage dividing resistor unit, and the gas discharge tube unit is connected with the voltage dividing resistor unit in parallel; the gas discharge tube unit includes at least one gas discharge tube; the voltage division resistance unit comprises at least one voltage division resistance. By selecting the divider resistor to be connected with the gas discharge tube in parallel, the voltage at the two ends of the gas discharge tube is approximately the same as that at the two ends of the voltage dependent resistor due to impedance matching of the divider resistor and the voltage dependent resistor, so that the breakover voltage of the gas discharge tube and the voltage dependent resistor can be reduced at the same time, and the residual voltage of the gas discharge tube after breakover is very low; the lower the turn-on voltage of the varistor, the lower the residual voltage. Therefore, the residual voltage of the differential mode surge protection circuit can be greatly reduced, and the differential mode protection level of the power supply is improved.
Description
Technical Field
The utility model relates to a surge protection technology field especially relates to a poor mould 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.
In outdoor environments, natural phenomena such as lightning often occur. The outdoor power supply is relatively harsh in use environment, and 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 particularly important, and a piezoresistor is usually arranged between a live wire and a zero line in a conventional differential mode surge protection circuit.
The selection of the voltage-sensitive voltage is usually selected according to the range of the input voltage of the power supply, the non-conduction within the rated working range of the voltage-sensitive resistor needs to be ensured, a certain margin is usually reserved, but the higher the voltage-sensitive conduction voltage is, the higher the lightning strike residual voltage is, and the poorer lightning strike protection effect is caused.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve is how to reduce differential mode surge protection circuit's thunderbolt residual voltage in order to improve thunderbolt protecting effect.
In order to solve the above problems, an embodiment of the present invention provides a differential mode surge protection circuit, where the differential mode surge protection circuit includes a voltage dependent resistor and a voltage relief unit, and the voltage dependent resistor and the voltage relief unit are connected in series between a live line and a zero line; the pressure relief unit comprises a gas discharge tube unit and a voltage dividing resistor unit, and the gas discharge tube unit is connected with the voltage dividing resistor unit in parallel; the gas discharge tube unit includes at least one gas discharge tube; the voltage division resistance unit comprises at least one voltage division resistance.
The gas discharge tube unit comprises a plurality of gas discharge tubes which are connected in series.
The gas discharge tube unit comprises a plurality of gas discharge tubes which are connected in parallel.
The further technical scheme is that the voltage dividing resistance unit comprises a plurality of voltage dividing resistances which are connected in series.
The further technical scheme is that the voltage dividing resistance unit comprises a plurality of voltage dividing resistances which are connected in parallel.
The differential mode surge protection circuit further comprises an overcurrent protection unit, and the overcurrent protection unit is used for being arranged on a live wire.
The further technical scheme is that the overcurrent protection unit is a fuse.
Compared with the prior art, the embodiment of the utility model provides a technical effect that can reach includes:
according to the technical scheme of the embodiment of the invention, the divider resistor is selected to be connected with the gas discharge tube in parallel, and the voltage at two ends of the gas discharge tube is approximately the same as that at two ends of the voltage dependent resistor due to impedance matching of the divider resistor and the voltage dependent resistor, so that the conduction voltage of the gas discharge tube and the voltage dependent resistor can be reduced at the same time, and the residual voltage of the gas discharge tube after conduction is very low; the lower the turn-on voltage of the varistor, the lower the residual voltage. Therefore, the residual voltage of the differential mode surge protection circuit can be greatly reduced, and the differential mode protection level of the power supply is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required 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 for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a circuit diagram of a differential mode surge protection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, wherein like component numbers represent like components. It is obvious that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 the 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, the embodiment of the present invention provides a differential mode surge protection circuit, and as can be seen from the figure, the differential mode surge protection circuit includes a voltage dependent resistor RV1 and a pressure relief unit 1.
The voltage dependent resistor RV1 and the voltage relief unit 1 are connected in series between the live line L and the zero line N. The voltage relief unit 1 includes a gas discharge tube unit 11 and a voltage dividing resistor unit 12. The gas discharge tube unit 11 and the voltage dividing resistance unit 12 are connected in parallel with each other. In the present embodiment, the gas discharge tube unit 11 includes one gas discharge tube GDT; the voltage-dividing resistance unit 12 includes a voltage-dividing resistance R.
According to the technical scheme of the embodiment of the invention, the divider resistor R is selected to be connected with the gas discharge tube GDT in parallel, and the divider resistor is impedance matched with the piezoresistor RV1, so that the voltages at two ends of the gas discharge tube GDT and two ends of the piezoresistor RV1 are approximately the same, the breakover voltage of the gas discharge tube GDT and the piezoresistor RV1 can be reduced at the same time, and the residual voltage of the gas discharge tube GDT after breakover is very low; the lower the turn-on voltage of the varistor RV1, the lower the residual voltage. Therefore, the residual voltage of the differential mode surge protection circuit can be greatly reduced, and the differential mode protection level of the power supply is improved.
With continued reference to fig. 1, the differential mode surge protection circuit further includes an overcurrent protection unit 2, which is configured to be disposed on the live line L. Specifically, in the present embodiment, the overcurrent protection unit 2 is a FUSE. The overcurrent protection unit 2 can avoid overlarge current in the differential mode surge protection circuit, and plays a role in overcurrent protection.
It should be noted that, in the present embodiment, the gas discharge tube unit includes one gas discharge tube; the voltage dividing resistance unit comprises a voltage dividing resistance. In order to achieve better effects, in other embodiments, the gas discharge tube unit may include a plurality of gas discharge tubes connected in series or in parallel, and the voltage dividing resistance unit may include a plurality of voltage dividing resistances connected in series or in parallel, so as to improve the reliability of the differential mode surge protection circuit. The above modifications do not exceed the protection 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 without departing from the spirit and scope of the invention. Thus, while the invention has been described with respect to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
The above description is for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A differential mode surge protection circuit is characterized by comprising a piezoresistor and a pressure relief unit, wherein the piezoresistor and the pressure relief unit are connected in series between a live wire and a zero wire; the pressure relief unit comprises a gas discharge tube unit and a voltage dividing resistor unit, and the gas discharge tube unit is connected with the voltage dividing resistor unit in parallel; the gas discharge tube unit includes at least one gas discharge tube; the voltage division resistance unit comprises at least one voltage division resistance.
2. The differential mode surge protection circuit of claim 1, wherein the gas discharge tube unit comprises a plurality of gas discharge tubes connected in series with each other.
3. The differential mode surge protection circuit of claim 1, wherein the gas discharge tube unit comprises a plurality of gas discharge tubes connected in parallel with each other.
4. The differential mode surge protection circuit according to claim 1, wherein the voltage dividing resistance unit comprises a plurality of voltage dividing resistances connected in series with each other.
5. The differential mode surge protection circuit according to claim 1, wherein the voltage dividing resistance unit comprises a plurality of voltage dividing resistances connected in parallel with each other.
6. The differential mode surge protection circuit according to claim 1, further comprising an over-current protection unit, wherein the over-current protection unit is configured to be disposed in a live line.
7. The differential mode surge protection circuit according to claim 6, wherein the over-current protection unit is a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921521165.8U CN210273497U (en) | 2019-09-12 | 2019-09-12 | Differential mode surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921521165.8U CN210273497U (en) | 2019-09-12 | 2019-09-12 | Differential mode surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210273497U true CN210273497U (en) | 2020-04-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921521165.8U Active CN210273497U (en) | 2019-09-12 | 2019-09-12 | Differential mode surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210273497U (en) |
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2019
- 2019-09-12 CN CN201921521165.8U patent/CN210273497U/en active Active
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