CN214280938U - High-voltage-resistance low-triggering surge protection circuit and surge protector - Google Patents
High-voltage-resistance low-triggering surge protection circuit and surge protector Download PDFInfo
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- CN214280938U CN214280938U CN202022939415.9U CN202022939415U CN214280938U CN 214280938 U CN214280938 U CN 214280938U CN 202022939415 U CN202022939415 U CN 202022939415U CN 214280938 U CN214280938 U CN 214280938U
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Abstract
The utility model relates to a surge protection circuit and surge protector that high withstand voltage low triggered, surge protection circuit includes: an input end; an output end; the protection main drainage module is connected between the output end and the input end; the protection main leakage flow module comprises: the third-stage protection module is connected with the input end; the second-stage protection module is connected with the third-stage protection module; the first-stage protection module is connected between the second-stage protection module and the output end, and the surge breakdown voltage of the second-stage protection module is the surge trigger voltage of the first-stage protection module; one end of the shunt voltage-withstand module is connected with the input end, and the other end of the shunt voltage-withstand module is connected with the output end; one end of the trigger module is connected with the input end, and the other end of the trigger module is connected between the second-level protection module and the third-level protection module. The utility model discloses a second level protection module and first order protection module improve power frequency withstand voltage, and the surge breakdown voltage of second level protection module is the surge trigger voltage of first order protection module, then the segmentation triggers the surge trigger voltage in order to reduce whole surge protection circuit.
Description
Technical Field
The utility model belongs to the technical field of surge protector's technique and specifically relates to a surge protection circuit and surge protector that high withstand voltage low triggered is related to.
Background
A surge protector, also called a lightning protector, is an electronic device for providing safety protection for various surge protectors, instruments and meters and communication lines. When the peak current or the voltage is suddenly generated in the electric loop or the communication line due to the external interference, the surge protector can conduct and shunt in a very short time, so that the damage of the surge to other equipment in the loop is avoided.
The lightning protection device mainly adopts ceramic gas discharge tube and piezo-resistor combined circuit, and in order to improve the withstand voltage of power frequency and the insulating level of equipment, traditional lightning protection device mainly adopts higher discharge voltage's piezo-resistor and discharge tube, and the residual voltage that higher discharge voltage's piezo-resistor and discharge tube that flows through when thunder and lightning impulse current can cause the lightning protection device risees, and the residual voltage that works as the lightning protection device is too high can influence the normal operating of equipment. To solve this problem, the conventional method is: the front end chooses the through-flow capacity for use great, and the withstand voltage level is good, and the higher lightning protection device of residual pressure is released, and the rear end adopts the cocurrent volume little, and the withstand voltage level is relatively poor, the lower lightning protection device of residual pressure, but needs a plurality of lightning protection device combinations just can have good effect, and adopts a plurality of lightning protection device combinations can cause the installation complicated, with high costs, inefficiency scheduling problem.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a surge protection circuit that high withstand voltage low triggered can trigger by the segmentation to reduce surge trigger voltage, improve surge protection circuit's power frequency withstand voltage, and it is few to set up the lightning protection device, saves the cost.
The application of the utility model also discloses a surge protector.
In a first aspect, an embodiment of the present invention provides a surge protection circuit triggered by high voltage resistance and low voltage resistance, including:
an input end;
an output end;
the protection main drainage module is electrically connected between the output end and the input end;
the protection main leakage flow module comprises:
the third-stage protection module is electrically connected with the input end;
the second-stage protection module is electrically connected with the third-stage protection module;
the first-stage protection module is electrically connected between the second-stage protection module and the output end, and the surge breakdown voltage of the second-stage protection module is the surge trigger voltage of the first-stage protection module;
one end of the shunt voltage-resistant module is connected with the input end, the other end of the shunt voltage-resistant module is connected with the output end, and the shunt voltage-resistant module is used for shunting when power frequency voltage is input so as to protect the main protection leakage module from flashover within a power frequency voltage range;
and one end of the trigger module is electrically connected with the input end, and the other end of the trigger module is connected between the second-stage protection module and the third-stage protection module.
The utility model discloses surge protection circuit that high withstand voltage low triggered has following beneficial effect at least: when the input inserts power frequency voltage, second level protection module and first level protection module are in the off-state, and the electric current shunts through the withstand voltage module of reposition of redundant personnel, and when access voltage exceeded power frequency voltage, first level protection module switched on back second level protection module and switched on, can improve surge protection circuit's power frequency withstand voltage through setting up second level protection module and first level protection module and the withstand voltage module of reposition of redundant personnel, and need not a plurality of lightning protection devices, saves the cost.
According to the utility model discloses a surge protection circuit that high withstand voltage low triggered of other embodiments, the withstand voltage module of reposition of redundant personnel includes: the transient suppression circuit comprises a first resistor, a second resistor and a transient suppression diode;
one end of the transient suppression diode is connected between the second-stage protection module and the first-stage protection module, the other end of the transient suppression diode is connected with one end of the first resistor, and the other end of the first resistor is connected with the output end;
one end of the second resistor is connected between the input end and the transient suppression diode, and the other end of the second resistor is connected between the second-stage protection module and the input end.
According to the utility model discloses a surge protection circuit of high withstand voltage low trigger of other embodiments, trigger module is including triggering electric capacity, trigger electric capacity one end connect in the input other end is connected the second resistance with between the first order protection module, when the surge, trigger electric capacity output trigger current extremely first order protection module.
According to the utility model discloses a surge protection circuit that high withstand voltage low triggered of other embodiments, first piezo-resistor one end is connected the input, the other end is connected the second resistance with between the second level protection module, first piezo-resistor is used for improving power frequency voltage.
According to the utility model discloses a surge protection circuit that high withstand voltage low triggered of other embodiments, the main earial drainage module of protection sets up a plurality ofly, and is a plurality of the main earial drainage module of protection is parallelly connected.
According to the utility model discloses a surge protection circuit that high withstand voltage low triggered of other embodiments, be equipped with protection module between the main earial drainage module of protection, protection module electricity is connected in arbitrary two adjacent between the main earial drainage module of protection.
According to the utility model discloses a surge protection circuit that high withstand voltage low triggered of other embodiments, first order protection module is the second and puts discharge tube, second order protection module is first discharge tube.
In a second aspect, an embodiment of the present invention provides a surge protector: comprising a high withstand voltage low trigger surge protection circuit as described in the first aspect.
The utility model discloses surge protector has following beneficial effect at least: through the arrangement of the high-voltage-withstanding low-triggering surge protection circuit of the first aspect, the power frequency withstand voltage of the high-voltage-withstanding low-triggering surge protection circuit can be improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a block diagram of a surge protection circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of another embodiment of a surge protection circuit with high withstand voltage and low trigger according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a surge protection circuit according to an embodiment of the present invention.
Reference numerals: 100. an input end; 200. an output end; 300. a protection main drainage module; 310. a first level protection module; 320. a second level protection module; 330. a shunt voltage-withstanding module; 340. a triggering module; 350. a third-stage protection module; 400. and a protection module.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
The surge protection circuit is also called as a lightning protector to prevent the surge protector which operates normally from being influenced by instant high-voltage impact, so that the common surge protector is provided with the surge protection circuit. However, the existing surge protection circuit is single-section protection and has a low voltage bearing range, so that the existing surge protection circuit cannot play a surge suppression role in a higher surge voltage range, and a surge protector is seriously damaged.
Based on this, the application discloses surge protection circuit and surge protector that high withstand voltage low triggered improves power frequency withstand voltage scope through the surge protection circuit that high withstand voltage low triggered, triggers in order to reduce surge trigger voltage through the segmentation, consequently only needs a surge protection circuit can realize that higher power frequency voltage tolerates, need not a plurality of lightning protection devices to save the cost.
First aspect, refer to fig. 1, the embodiment of the utility model discloses surge protection circuit that high withstand voltage low triggered is disclosed, include: the input end 100, the output end 200 and the protection main leakage module 300, wherein the protection main leakage module 300 is connected between the input end 100 and the output end 200. The protection main leakage flow module 300 includes: the protection circuit comprises a first-stage protection module 310, a second-stage protection module 320, a shunt voltage-withstanding module 330, a trigger module 340 and a third-stage protection module 350, wherein the third-stage protection module 350 is electrically connected with the input end 100; one end of the second-stage protection module 320 is connected to the third-stage protection module 350, and the other end is connected to one end of the first-stage protection module 310; the other end of the first stage guard module 310 is connected to the output terminal 200. The shunt voltage-withstand module 330 has one end connected to the input terminal 100 and the other end connected to the output terminal 200. The voltage-withstanding shunting module 330 shunts when used for inputting power frequency voltage, so that the second-stage protection module 320 and the first-stage protection module 310 are in a closed state, so that the surge protection circuit indicates to shunt, the surge protector connected with high voltage withstanding and low triggering cannot be flashed in a certain power frequency voltage range, one end of the triggering module 340 is electrically connected to the input end 100, and the other end of the triggering module is connected between the third-stage protection module 350 and the second-stage protection module 320.
The input end 100 may be a live line or a neutral line, the output end 200 is a ground line, and the surge breakdown voltage of the second-stage protection module 320 is the surge trigger voltage value of the first-stage protection module 310. When the input surge voltage is greater than the surge breakdown voltage of the first protection module 310, since the surge voltage is faster than the power frequency voltage, the trigger module 340 generates a capacitive current to supply to the first protection module 310, the voltage-sharing and voltage-withstanding module 330 plays a decoupling role when suffering from the surge voltage, and at this time, the first protection module 310 is triggered first. After the first-stage protection module 310 is conducted, the impedance of the first-stage protection module 310 is reduced, and the voltage at two ends of the second-stage protection module 320 is increased, so that the second-stage protection module 320 is broken down, the whole protection loop is conducted, a current leakage channel is formed, and the electric equipment provided with the surge protection device is protected. Therefore, the surge breakdown voltage of the whole circuit is reduced through the first-stage protection module 310 and the second-stage protection module 320 which are triggered in a segmented mode, and the residual voltage of the surge protection circuit is reduced. When voltage rising interval can be convenient for to set up the withstand voltage module 330 of reposition of redundant personnel, the withstand voltage module 330 of reposition of redundant personnel shunts, and second level protection module 320 and first order protection module 310 are in the off-state, then install surge protection circuit's consumer and normally insert the power frequency voltage operation. When the surge voltage is connected, the second-stage protection module 320 and the first-stage protection module 310 are conducted to protect the electric equipment.
Specifically, the first-stage protection module 310 is a second discharge tube GDT2, the second-stage protection module 320 is a first discharge tube GDT1, and when the input terminal 100 is connected to the power frequency voltage, the first discharge tube GDT1 and the second discharge tube GDT2 do not obtain enough conduction current within a certain voltage range, so that the first discharge tube GDT1 and the second discharge tube GDT2 are in an off state. When the input terminal 100 is connected with the surge voltage, the second discharge tube GDT2 is conducted, the impedance is reduced, the voltage across the first discharge tube GDT1 is increased, and a conducting condition is formed, so that the first discharge tube GDT1 and the second discharge tube GDT2 are triggered in a segmented mode to reduce the surge breakdown voltage.
Referring to fig. 1 and 3, in some embodiments, the shunt withstand voltage module 330 includes: a first resistor R1, a second resistor R2 and a transient suppression diode DW 1; one end of the transient suppression diode DW1 is connected between the second-stage protection module 320 and the first-stage protection module 310, the other end of the transient suppression diode DW1 is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with the output end 200; one end of the second resistor R2 is connected between the input terminal 100 and the transient suppression diode DW1, and the other end is connected between the second stage protection module 320 and the input terminal 100.
Specifically, one end of the transient suppression diode DW1 is connected between the first discharge tube GDT1 and the second discharge tube GDT2, the other end of the transient suppression diode DW1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the output end 200; one end of the second resistor R2 is connected to the live line or the neutral line, and the other end of the second resistor R2 is connected to the first discharge tube GDT1 and the live line or between the first discharge tube GDT1 and the ground line. When the voltage rises slowly during power frequency voltage withstanding, the decoupling effect of the first resistor R1 is not obvious, the transient suppression diode DW1 breaks down, and current is output to the ground wire through the second resistor R2, the transient suppression diode DW1 and the first resistor R1. When the live wire or the zero line generates surge, the voltage rising curve is steep, then transient suppression diode DW1 is because first resistance R1 is decoupled, response time is long, then second discharge tube GDT2 switches on, then resistance drops after second discharge tube GDT2 switches on, then voltage rising breakdown at both ends of first discharge tube GDT1 forms whole bleeder path and discharges, thereby form the short circuit, prevent that high voltage from damaging consumer, and first discharge tube GDT1 just switches on after second discharge tube GDT2 switches on, realize the segmentation switches on, the scope of withstand voltage has been improved, so that the configuration of the high voltage withstand consumer is convenient for.
In some embodiments, the triggering module 340 includes: and a trigger capacitor C1, wherein one end of the trigger capacitor C1 is connected between the input terminal 100 and the other end of the trigger capacitor C1 which is connected between the second resistor R2 and the first-stage protection module 310, and when a surge occurs, the trigger capacitor C1 outputs a trigger current to the first-stage protection module 310.
Specifically, one end of the trigger capacitor C1 is connected to the live wire or the neutral wire, and the other end is connected to the second resistor R2 and the transient suppression diode DW 1. When the input terminal 100 is connected with a surge voltage, and the surge voltage is greater than the trigger voltage of the first-stage protection module 310, because the surge voltage is faster than the rising rate of the power frequency power supply, the trigger capacitor C1 generates a capacitive current to supply to the second discharge tube GDT2, and the first resistor R1 plays a decoupling role when suffering from the surge voltage. The response time of the transient suppression diode D1 is increased under the action of decoupling of the first resistor R1, at the moment, the second discharge tube GDT2 is triggered firstly, after the second discharge tube GDT2 is conducted, the impedance is reduced, the voltage at two ends of the first discharge tube GDT1 is increased, a conducting condition is formed and then triggered, the second discharge tube GDT2 and the first discharge tube GDT1 are sequentially triggered in a segmented mode, therefore, the surge breakdown voltage of the whole circuit module is reduced by triggering the second discharge tube GDT2 and the first discharge tube GDT1 in a segmented mode, and the residual voltage of the protection circuit module is reduced. Therefore, the trigger capacitor C1 can facilitate the second discharge tube GDT2 to conduct, so that the whole surge protection circuit conducts at high voltage to protect the electric equipment.
In some embodiments, third level guard module 350 includes: one end of a first voltage dependent resistor MOV1, one end of a first voltage dependent resistor MOV1 is connected with the input end 100, the other end of the first voltage dependent resistor MOV1 is connected between the second resistor R2 and the second-stage protection module 320, and the first voltage dependent resistor MOV1 is used for improving power frequency withstand voltage.
The first varistor MOV1 is used as a common-mode main leakage path to disconnect the free current of the protection main leakage module 300. Therefore, when a surge occurs in the live line or the neutral line, the resistance across the first varistor MOV1 decreases sharply, and the voltage across the second discharge tube GDT2 increases until the voltage across the first discharge tube GDT1 increases after the second discharge tube GDT2 is turned on. When the connected voltage reaches the trigger voltage of the first discharge tube GDT1, the first discharge tube GDT1 is turned on. And the second discharge tube GDT2 is broken down again after the first discharge tube GDT1 is broken down, so that the power frequency withstand voltage of the surge protection circuit is improved. In the embodiment, the first discharge tube GDT1 and the second discharge tube GDT2 are arranged, so that the power frequency withstand voltage can be improved to be 1700-2000V. The first varistor MOV1 is also provided as a third stage of protection for the entire surge protection circuit to further improve the protection of the surge protection circuit. When the input end 100 is connected with power frequency voltage, the voltage withstand level of the first voltage dependent resistor MOV1 is equal to the sum of the power frequency withstand voltage of each stage of protection through the superposition of the first voltage dependent resistor MOV1, so that the power frequency voltage is increased.
In some embodiments, the protection main leakage module 300 is provided in number, the corresponding input terminal 100 is provided in number, and each protection main leakage module 300 is connected to one input terminal 100 at one end and is connected to the output terminal 200 at the other end. Specifically, one end of each protection main leakage module 300 is connected to one input terminal 100, and the other end is connected to the ground, so as to protect the input terminals 100 of different electric devices.
By arranging a plurality of protection main leakage modules 300, the continuous extension of the segmented trigger protection is realized to realize multi-stage protection.
Referring to fig. 1 and 2, in the present embodiment, two protection main leakage modules 300 are provided, and are respectively defined as a first protection main leakage module and a second protection main leakage module. One end of the first protection main current discharging module is connected with the live wire, and the other end of the first protection main current discharging module is connected with the ground wire; one end of the second protection main drainage module is connected with the zero line, and the other end of the second protection main drainage module is connected with the ground wire. Two protection main leakage modules 300 are arranged to protect corresponding circuits.
In some embodiments, when the protection main leakage modules 300 are provided in several numbers, the protection module 400 is electrically connected between two adjacent protection main leakage modules 300, and the protection module 400 serves as a differential mode main leakage channel of two adjacent protection main leakage modules 300 to prevent two adjacent protection main leakage modules 300 from being conducted to directly form a loop to cause damage to the electric equipment, so that the protection module 400 is provided to protect the electric equipment which is adjacently connected to the protection main leakage modules 300.
The protection module 400 is a second varistor MOV2, and the second varistor MOV2 is disposed between two adjacent protection main leakage modules 300 to protect the input terminals 100 of the two adjacent protection main leakage modules 300. For example, the first protection main current leakage module is connected with the live wire, the second protection main current leakage module is connected with the neutral wire, and the second piezoresistor MOV2 is connected between the live wire and the neutral wire, so that the live wire and the neutral wire are prevented from being short-circuited through the second piezoresistor MOV 2.
A surge protection circuit with high withstand voltage and low trigger according to an embodiment of the present invention is described in detail with a specific embodiment with reference to fig. 1 to 3. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.
When the voltage connected to the live wire or the zero wire is increased slightly, the decoupling effect of the first resistor R1 is not obvious, the transient suppression diode DW1 breaks down, the current is output to the ground line through the capacitive current of the trigger capacitor C1 and the first voltage dependent resistor MOV1 through the second resistor R2, the transient suppression diode DW1 and the first resistor R1 to form a loop shunt, and the main leakage current channel cannot reach the breakdown current when the circuit voltage is in a certain range. When the live wire or zero wire access voltage rises to reach surge voltage, the transient suppression diode DW1 is decoupled due to the first resistor R1, the response time is slow, the second discharge tube GDT2 reaches a conducting condition due to the capacitive current of the trigger capacitor C1, the resistance value of the second discharge tube GDT2 after being conducted is reduced, and the voltage of the first voltage dependent resistor MOV1 and the voltage of the first discharge tube GDT1 rises and breaks down to form the whole leakage current channel to discharge.
In conclusion, the first discharge tube GDT1 and the second discharge tube GDT2 are arranged to realize segmented triggering, so that the triggering voltage is reduced, the power frequency withstand voltage range of the surge protection circuit is increased, and the protection configuration of some electric devices with higher withstand voltage requirements is facilitated.
In a second aspect, the embodiment of the present invention further discloses a surge protector, which includes a surge protection circuit that triggers as the high voltage withstanding of the first aspect.
The specific circuit structure and circuit principle of the high-withstand-voltage low-trigger surge protection circuit refer to the high-withstand-voltage low-trigger surge protection circuit of the first aspect.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (8)
1. A surge protection circuit that high withstand voltage low triggered which characterized in that includes:
an input end;
an output end;
the protection main drainage module is electrically connected between the output end and the input end;
the protection main leakage flow module comprises:
the third-stage protection module is electrically connected with the input end;
the second-stage protection module is electrically connected with the third-stage protection module;
the first-stage protection module is electrically connected between the second-stage protection module and the output end, and the surge breakdown voltage of the second-stage protection module is the surge trigger voltage of the first-stage protection module;
one end of the shunt voltage-resistant module is connected with the input end, the other end of the shunt voltage-resistant module is connected with the output end, and the shunt voltage-resistant module is used for shunting when power frequency voltage is input so as to protect the main protection leakage module from flashover within a power frequency voltage range;
and one end of the trigger module is electrically connected with the input end, and the other end of the trigger module is connected between the second-stage protection module and the third-stage protection module.
2. The high withstand voltage low-trigger surge protection circuit according to claim 1, wherein the shunt withstand voltage module comprises: the transient suppression circuit comprises a first resistor, a second resistor and a transient suppression diode;
one end of the transient suppression diode is connected between the second-stage protection module and the first-stage protection module, the other end of the transient suppression diode is connected with one end of the first resistor, and the other end of the first resistor is connected with the output end;
one end of the second resistor is connected between the input end and the transient suppression diode, and the other end of the second resistor is connected between the second-stage protection module and the input end.
3. The surge protection circuit with high voltage endurance and low trigger according to claim 2, wherein the trigger module comprises a trigger capacitor, one end of the trigger capacitor is connected between the input end and the other end of the trigger capacitor is connected between the second resistor and the first stage protection module, and when in surge, the trigger capacitor outputs trigger current to the first stage protection module.
4. The high withstand voltage low trigger surge protection circuit according to claim 3, wherein said third stage protection module comprises: a first voltage dependent resistor;
the first voltage dependent resistor is connected with one end of the input end, the other end of the first voltage dependent resistor is connected with the second resistor and the second-stage protection module, and the first voltage dependent resistor is used for improving power frequency voltage.
5. The surge protection circuit with high voltage endurance and low trigger according to any one of claims 1 to 4, wherein a plurality of protection main leakage modules are provided, and a plurality of protection main leakage modules are connected in parallel.
6. The high voltage withstand low triggering surge protection circuit according to claim 5, wherein a protection module is disposed between the protection main leakage modules, and the protection module is electrically connected between any two adjacent protection main leakage modules.
7. The high withstand voltage low trigger surge protection circuit according to claim 1, wherein the first stage protection module is a second discharge tube, and the second stage protection module is a first discharge tube.
8. A surge protector, characterized by comprising a high withstand voltage low trigger surge protection circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022939415.9U CN214280938U (en) | 2020-12-10 | 2020-12-10 | High-voltage-resistance low-triggering surge protection circuit and surge protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022939415.9U CN214280938U (en) | 2020-12-10 | 2020-12-10 | High-voltage-resistance low-triggering surge protection circuit and surge protector |
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| Publication Number | Publication Date |
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| CN214280938U true CN214280938U (en) | 2021-09-24 |
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| CN202022939415.9U Active CN214280938U (en) | 2020-12-10 | 2020-12-10 | High-voltage-resistance low-triggering surge protection circuit and surge protector |
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