CN218603170U - Overvoltage protection device and overvoltage protection system - Google Patents
Overvoltage protection device and overvoltage protection system Download PDFInfo
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- CN218603170U CN218603170U CN202222947990.2U CN202222947990U CN218603170U CN 218603170 U CN218603170 U CN 218603170U CN 202222947990 U CN202222947990 U CN 202222947990U CN 218603170 U CN218603170 U CN 218603170U
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Abstract
An overvoltage protection device and an overvoltage protection system, the device comprises a protection circuit connected with a protected device in parallel, and a circuit breaking device, wherein the circuit breaking device is arranged in a common loop of the protection circuit and the protected device; the protection circuit comprises a circuit breaker driving circuit and a trigger circuit, the trigger circuit is connected with a control end of the circuit breaker driving circuit, the trigger circuit is used for providing trigger voltage for the control end when the voltage at two ends of the protection circuit is larger than a preset threshold value so as to trigger the circuit breaker driving circuit to be conducted, and the circuit breaker driving circuit is used for reducing the voltage at two ends of the protection circuit after being conducted and driving the circuit breaker to break the public loop. The device can flexibly set the threshold voltage, realizes voltage clamping when the input voltage exceeds the threshold voltage, and has high reliability and high response speed.
Description
Technical Field
The utility model relates to an overvoltage protection field generally, more specifically relates to an overvoltage protection device and overvoltage protection system.
Background
An RCD (Residual Current Device) is an overvoltage protection Device for detecting the magnitude of leakage Current in a line. When testing the RCD, it is necessary to simulate the leakage current by a current source. When carrying out some special tests, can be at the output port input commercial power of current source, if user's maloperation or product when having the problem this moment, then damage the current source or damage the product that awaits measuring, increase loss of property, then the heavy time is on fire, explosion, influences life safety.
SUMMERY OF THE UTILITY MODEL
A series of concepts in a simplified form are introduced in the summary section, which will be described in further detail in the detailed description section. The summary of the present application is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
An embodiment of the present invention provides an overvoltage protection device, which includes a protection circuit connected in parallel with a protected device, and a circuit breaker, wherein the circuit breaker is disposed in a common loop of the protection circuit and the protected device;
the protection circuit comprises a circuit breaker driving circuit and a trigger circuit, the trigger circuit is connected with a control end of the circuit breaker driving circuit, the trigger circuit is used for providing trigger voltage for the control end when the voltage at two ends of the protection circuit is larger than a preset threshold value so as to trigger the circuit breaker driving circuit to be conducted, and the circuit breaker driving circuit is used for reducing the voltage at two ends of the protection circuit after being conducted and driving the circuit breaker to break the public loop.
In some embodiments, the circuit interrupting device driving circuit includes a thyristor, and the control terminal of the circuit interrupting device driving circuit includes a gate of the thyristor.
In some embodiments, the trigger circuit includes a diode connected to the input terminal and the control terminal of the circuit interrupting device driving circuit and a resistor connected to the diode, the resistor being connected to the control terminal and the output terminal of the circuit interrupting device driving circuit, the diode is configured to reverse breakdown when a voltage across the protection circuit is greater than a predetermined threshold, and the resistor is configured to provide a trigger voltage to the control terminal of the circuit interrupting device driving circuit after the diode reverse breakdown.
In some embodiments, the diode comprises a zener diode.
In some embodiments, the circuit interrupting device driving circuit includes a thyristor, the cathode of the diode is coupled to the anode of the thyristor, the anode of the diode is coupled to the first terminal of the resistor and the gate of the thyristor, and the second terminal of the resistor is coupled to the cathode of the thyristor.
In some embodiments, the circuit interrupting device includes a fuse having a thermal energy of fusion less than a thermal energy of fusion of the circuit interrupting device driving circuitry.
In some embodiments, the protection circuit further comprises a rectifying unit, and the circuit breaking device driving circuit and the triggering circuit are connected to the output terminal of the rectifying unit.
In some embodiments, the circuit interrupting device comprises a fuse, and the fuse device has a value of thermal energy of fusion that is less than the value of thermal energy of fusion of the rectifying unit.
The embodiment of the utility model provides a further aspect provides an overvoltage protection system, overvoltage protection system is including being protected the device and as above overvoltage protector.
In some embodiments, the protected device comprises a current source of a residual current detection device.
The utility model discloses overvoltage protector and overvoltage protection system can be effectively for being provided overvoltage protection by the protection device, can set up threshold voltage in a flexible way to realize voltage clamp when input voltage surpasses threshold voltage, the reliability is high, and response speed is fast.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
FIG. 1 is a schematic diagram of a current source correct usage method and an incorrect usage method;
fig. 2 is a schematic view of an overvoltage protection device according to an embodiment of the present invention;
fig. 3 is a schematic view of an overvoltage protection device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an actual test waveform of the overvoltage protection device according to an embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
It will be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it can be directly on, adjacent to, connected or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatial relational terms such as "under," "below," "under," "above," "over," and the like may be used herein for convenience in describing the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, 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. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to thoroughly understand the present invention, a detailed structure will be provided in the following description in order to explain the technical solution provided by the present invention. The preferred embodiments of the present invention are described in detail below, however, the present invention can have other embodiments in addition to these detailed descriptions.
As shown in fig. 1, when the commercial power is input to the output port of the current source, there is a possibility that the current source or the product to be tested is damaged due to a wiring error. To address this problem, there are two approaches: (1) Acquiring voltages at two ends of a fused fuse and alarming the fused fuse through an MCU (Micro Control Unit) of a current source, wherein the MCU acquires information about the fused fuse and can disconnect a relay on the current source; (2) And setting the threshold voltage of the current source output end port by using hardware, sending information to the MCU when detecting that the voltage of the current source output end port is greater than the threshold voltage, and prompting a user that high voltage is input after the MCU receives the information and disconnecting a relay on the current source.
The above scheme has the following problems: (1) The MCU acquires information and processes the information in millisecond time, and a current source needs to bear the external voltage of a user in the time period; (2) The maximum time for the ohm dragon relay to be disconnected is about 5 milliseconds, and the current source also needs to bear the external voltage of a user in the 5 millisecond time period; (3) The time of resisting instantaneous heavy current of a fuse with the rated current of 5A on the market at present is about 30 milliseconds, and if a user accesses a mains supply in the period of time, a current source can bear 220V alternating current, so that the current source is easily damaged; (4) The current source output port protects the current source by the piezoresistor, and the moment when the piezoresistor is conducted has great residual voltage which has the risk of damaging the current source.
In view of the above problem, an embodiment of the present invention provides an overvoltage protection device, which includes a protection circuit connected in parallel with a device to be protected, and a circuit breaker, where the circuit breaker is disposed in a common loop of the protection circuit and the device to be protected; the protection circuit comprises a circuit breaker device driving circuit and a trigger circuit, the trigger circuit is connected with a control end of the circuit breaker device driving circuit, the trigger circuit is used for providing trigger voltage for the control end when the voltage at two ends of the protection circuit is larger than a preset threshold value so as to trigger the circuit breaker device driving circuit to be conducted, and the circuit breaker device driving circuit is used for reducing the voltage at two ends of the protection circuit after being conducted and driving the circuit breaker device to be disconnected with the common loop. The utility model discloses overvoltage protector can be effectively for being provided overvoltage protection by the protection device, can set up threshold voltage in a flexible way to realize voltage clamp when input voltage surpasses threshold voltage, the reliability is high, and response speed is fast.
The overvoltage protection device and the overvoltage protection system according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.
Referring to fig. 1, the overvoltage protection device for the current source output end of the residual current testing device according to the embodiment of the present invention includes a protection circuit 210 and a circuit breaker 220, the protection circuit 210 is connected in parallel with a protected device 230, and the circuit breaker 220 is disposed in a common loop of the protection circuit 210 and the protected device 230; the protection circuit 210 includes a circuit breaker device driving circuit 211 and a trigger circuit 212, the trigger circuit 212 is connected to a control terminal of the circuit breaker device driving circuit 211, the trigger circuit 212 is configured to provide a trigger voltage to the control terminal when a voltage across the protection circuit 210 is greater than a preset threshold value, so as to trigger the circuit breaker device driving circuit 211 to be turned on, and the circuit breaker device driving circuit 211 is configured to reduce a voltage across the protection circuit 210 after being turned on, and drive the circuit breaker device 220 to break a common loop.
In some embodiments, the breaking device drive circuit 211 comprises a thyristor. The thyristor includes an anode, a cathode and a gate, the anode and the cathode are connected to the voltage port, and the gate is connected to the trigger circuit 212, i.e., the control terminal of the circuit breaker driving circuit is the gate of the thyristor. According to the operating principle of the thyristor, when the thyristor is subjected to a reverse anode voltage, any gate voltage cannot make it conductive. When the thyristor is subjected to a positive anode voltage, it is only turned on when the gate is subjected to a positive voltage. When the thyristor is not conducting, the current flowing through the thyristor is negligible. When the thyristor is turned on, the thyristor approximates a short circuit condition and a significant current flows, driving the disconnect device 220 to open. The thyristor is used as a main switching device, so that the voltage at two ends of the protected device can be pulled down to a voltage lower than a preset threshold value of overvoltage protection when the protection action is executed, and the device to be protected is safer. Besides thyristors, the breaking device driving circuit 211 may also apply other devices that can be triggered to conduct by a trigger voltage, such as MOS transistors.
A trigger voltage to trigger conduction of a thyristor or the like is provided by trigger circuit 212. The trigger circuit 212 may be configured to set a threshold voltage, i.e., when the voltage applied to the trigger circuit 212 exceeds a preset threshold, the trigger circuit 212 provides the trigger voltage to the circuit breaker driving circuit 211, and when the voltage applied to the trigger circuit 212 does not exceed the preset threshold, the trigger circuit 212 cannot provide the trigger voltage to the circuit breaker driving circuit 211.
In some embodiments, the trigger circuit 212 includes a diode and a resistor connected to the diode. The diode connects the input terminal and the control terminal of the circuit breaking device driving circuit 211, and the resistor connects the control terminal and the output terminal of the circuit breaking device driving circuit 211. When the triggering circuit 212 includes a diode and a resistor, and the breaking device driving circuit 211 includes a thyristor, the cathode of the diode is connected to the anode of the thyristor, the anode of the diode is connected to the first terminal of the resistor and the gate of the thyristor, and the second terminal of the resistor is connected to the cathode of the thyristor.
The diode is used for reverse breakdown when the voltage across the protection circuit 210 is greater than a preset threshold, and the resistor is used for voltage division after the diode is conducted so as to provide trigger voltage for the control end of the circuit breaker driving circuit 211. When the voltage across the protection circuit 210 is less than or equal to the predetermined threshold, the diode has a large reverse resistance, so that the control terminal of the circuit breaker driving circuit 211 cannot receive the trigger voltage. When the voltage across the protection circuit 210 is greater than the preset threshold, the diode is turned on after reverse breakdown, the resistance is divided, and a trigger voltage is provided for the control terminal of the circuit breaker driving circuit 211.
In some embodiments, the diode is a voltage regulator diode (i.e., a voltage regulator tube) which can recover after reverse breakdown once the voltage is lower than a preset threshold value, and the voltage is basically not changed along with the change of the current, so that the voltage regulation effect is realized. In addition, the voltage threshold value judgment by using the voltage stabilizing diode has the advantages of good accuracy, no need of program judgment, high reliability and high response speed.
Further, the protection circuit 210 further includes a rectifying unit, and the circuit breaking device driving circuit 211 and the trigger circuit 212 are connected to an output terminal of the rectifying unit. The rectifier unit can be with alternating current conversion for the direct current, through setting up the rectifier unit at protection circuit 210 foremost, can make the utility model discloses overvoltage protection device realizes alternating current and DC voltage's overvoltage protection. The rectifying unit can comprise a rectifying bridge, a rectifying unit built by using diodes, a rectifying unit built by using synchronous arrangement and the like.
Fig. 3 is a schematic diagram of an implementation of an embodiment of the present invention. The trigger circuit comprises a voltage regulator tube D2 and a resistor R1, the circuit breaker driving circuit 211 comprises a thyristor Q1, and the circuit breaker adopts a fuse F1. The overvoltage protection arrangement shown in fig. 3 also comprises a rectifier bridge D1. The voltage parameter of the voltage regulator tube D2 determines the setting of a preset threshold, and a circuit formed by the thyristor Q1, the resistor R1 and the voltage regulator tube D2 can realize voltage clamping at the moment of overvoltage and drive the fuse F1 to fuse. When a user accesses a voltage larger than a preset threshold value on Lin and Lout due to misoperation, the voltage stabilizing tube D2 is conducted, so that the voltage stabilizing tube D2 and the resistor R1 form a voltage dividing circuit, and the voltage on the voltage stabilizing tube D2 plus the voltage on the resistor R1 is equal to the voltage rectified by the rectifier bridge D1. When the voltage of the voltage regulator tube D2 is stabilized, the rest voltage on the rectifier bridge D1 is added to the resistor R1, when the voltage on the resistor R1 is larger than the gate trigger voltage of the thyristor Q1, the thyristor Q1 is immediately conducted, and the conducted thyristor Q1 is equivalent to a short circuit. At this time, a very large current flows through the fuse F1, the rectifier bridge D1 and the thyristor Q1, so that the fuse F1 is fused, and a protected device at the rear end is protected. When the protection circuit executes protection action, the breakover voltage is lower, so that the protected device is prevented from overvoltage in the protection process.
Wherein the breaking device may be a fuse, a circuit breaker, or the like. The principle of the fuse is that a current flowing through a conductor can heat the conductor, and the conductor melts after reaching the melting point of the conductor, so that a circuit is broken. The principle of the circuit breaker is the current bottom magnetic effect, namely, the circuit breaking protection is realized through an electromagnetic trip. The fuse element is required to be replaced after being fused to recover power supply, and the breaker is used for adopting a tripping mode, so that power supply can be recovered only through closing action. In addition to this, the circuit breaking device may also comprise a transistor, for example a Field Effect Transistor (FET), and the transistor may be driven to break the main circuit in such a way that the comparison voltage is low. Considering that the fusing action of the fuse is faster than that of the circuit breaker and the transistor, the fuse can be preferably used as the circuit breaking device of the embodiment of the present invention.
The circuit breaker is the most current-sensitive component of the overvoltage protection device, so that other components of the overvoltage protection device can be continuously used after the circuit breaker is broken. When a fuse is used as a circuit-breaking device, it is necessary to secure a heat energy value (I) of fusion of the fuse 2 T) is less than the value of the thermal energy of fusion of the circuit interrupting device driving circuit, i.e., the value of the thermal energy of fusion of the fuse is less than the value of the thermal energy of fusion of the thyristor. The smaller the melting heat energy value, the less energy the device can withstand and the faster the fusing speed. In addition, if the protection circuit 210 is provided with a rectifying unit, it is necessary to ensure that the heat energy value of the fuse is smaller than the heat energy value of the rectifying unit.
Referring to tables 1, 2 and 3, table 1 shows parameters such as heat of fusion values of fuses of different models, table 2 shows parameters of thyristors, and table 3 shows parameters of rectifier bridges. Wherein the fuse has a heat of fusion value of from 0.2A 2 S to 64A 2 S is unequal, and the comprehensive consideration can adopt that the melting heat energy value is 25A 2 And a fuse of S. The thyristor has a heat of fusion value of 9.49-9.80kA 2 And s. Heat of fusion of rectifier bridgeEnergy value is 660A 2 And s. Due to the heat of fusion value (25A) of the fuse 2 S) is much less than the heat energy of fusion (660A 2S) of the rectifier bridge and the heat energy of fusion (9800A) of the thyristor 2 S) so the fuse will fail first before the thyristor and rectifier bridge.
TABLE 1 fuse parameters
TABLE 2 thyristor parameters
TABLE 3 rectifier bridge parameters
It will be appreciated that the above heat of fusion values for each device are exemplary only and not intended to be limiting, and that the type of device may be selected only to ensure that the fuse fails first before the other devices in the overvoltage protection device.
The practical test waveform of the overvoltage protection device of the embodiment of the utility model is shown in figure 4. The time for fuse failure is around 6.4 ms. The voltage is climbing at time 1 in fig. 4, and the voltage has not yet reached the preset threshold. After the voltage exceeds the preset threshold, it decreases to a safe voltage of about a few volts at the 2 nd instant, where the thyristor is on, and the current increases sharply. At time 3, the fuse blows, the current is 0mA and there is no current in the circuit. When the current is 0mA, the voltage has positive and negative voltages, and the voltage is the voltage output by the current source.
In summary, the overvoltage protection device of the embodiment of the present invention can absorb a large instantaneous current, so as to effectively protect a protected device; the preset threshold value of the protection voltage can be flexibly set, and the input voltage is quickly clamped to a very low range when the input voltage exceeds the preset threshold value; the reliability is high, and the response speed is fast.
The embodiment of the utility model provides an on the other hand provides an overvoltage protection system, overvoltage protection system include by the protection device and as above overvoltage protector, overvoltage protector is used for providing overvoltage protection for by the protection device. Specifically, the overvoltage protection device comprises a protection circuit and a circuit breaking device, wherein the protection circuit is connected with a protected device in parallel, and the circuit breaking device is arranged in a common loop of the protection circuit and the protected device. The protection circuit comprises a circuit breaker device driving circuit and a trigger circuit, the trigger circuit is connected with a control end of the circuit breaker device driving circuit and used for providing trigger voltage for the control end when the voltage at two ends of the protection circuit is larger than a preset threshold value so as to trigger the circuit breaker device driving circuit to be conducted, and the circuit breaker device driving circuit is used for reducing the voltage at two ends of the protection circuit after being conducted and driving the circuit breaker device to break a common loop. For more details of the overvoltage protection device, reference is made to the above description, which is not repeated here.
Exemplarily, the overvoltage protection device can be integrated inside the protected device, i.e. the overvoltage protection system can be implemented as the protected device integrated with the overvoltage protection device according to the embodiment of the present invention. The protected device may be implemented as any device requiring overvoltage protection. In some embodiments, the protected device may be implemented as a current source for a residual current detection device, the current source being used to simulate leakage current when testing the residual current detection device. When inserting the commercial power in the test process, even the user has carried out the maloperation, the utility model discloses overvoltage protection device also can be in time protected the electric current source and not damaged by high voltage.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present invention should not be interpreted as reflecting an intention that: rather, the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only for the specific embodiments of the present invention or the description of the specific embodiments, the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An overvoltage protection arrangement, characterized in that the overvoltage protection arrangement comprises a protection circuit in parallel with a protected device, and a circuit breaking device, which circuit breaking device is arranged in a common loop of the protection circuit and the protected device;
the protection circuit comprises a circuit breaker device driving circuit and a trigger circuit, the trigger circuit is connected with a control end of the circuit breaker device driving circuit, the trigger circuit is used for providing trigger voltage for the control end when the voltage at two ends of the protection circuit is larger than a preset threshold value so as to trigger the circuit breaker device driving circuit to be conducted, and the circuit breaker device driving circuit is used for reducing the voltage at two ends of the protection circuit after being conducted and driving the circuit breaker device to be disconnected with the common loop.
2. The overvoltage protection device of claim 1, wherein said circuit interrupting device drive circuit includes a thyristor, and wherein the control terminal of said circuit interrupting device drive circuit includes the gate of said thyristor.
3. The overvoltage protection device according to claim 1 or 2, wherein said trigger circuit comprises a diode and a resistor connected to said diode, said diode being connected to an input terminal and a control terminal of said circuit interrupting device driver circuit, said resistor being connected to a control terminal and an output terminal of said circuit interrupting device driver circuit, said diode being adapted to reverse breakdown when a voltage across said protection circuit is greater than a predetermined threshold, said resistor being adapted to divide a voltage after said diode reverse breakdown to provide a trigger voltage to said control terminal of said circuit interrupting device driver circuit.
4. The overvoltage protection device of claim 3, wherein the diode comprises a zener diode.
5. The overvoltage protection device according to claim 3, wherein said circuit interrupting device drive circuit includes a thyristor, a cathode of said diode is connected to an anode of said thyristor, an anode of said diode is connected to a first terminal of said resistor and a gate of said thyristor, and a second terminal of said resistor is connected to a cathode of said thyristor.
6. The overvoltage protection device of claim 1, wherein said circuit interrupting device includes a fuse having a heat of fusion energy value less than a heat of fusion energy value of said circuit interrupting device drive circuit.
7. The overvoltage protection device of claim 1, wherein said protection circuit further includes a rectifying unit, said circuit interrupting device driver circuit and said triggering circuit being connected to an output of said rectifying unit.
8. The overvoltage protection device of claim 7, wherein said circuit interrupting device comprises a fuse, said fuse having a thermal energy of fusion less than a thermal energy of fusion of said rectifier unit.
9. An overvoltage protection system, characterized in that the overvoltage protection system comprises a protected device and an overvoltage protection arrangement according to any one of claims 1-8.
10. The overvoltage protection system of claim 9, wherein the protected device includes a current source of a residual current detection device.
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| CN202222947990.2U CN218603170U (en) | 2022-11-04 | 2022-11-04 | Overvoltage protection device and overvoltage protection system |
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