CN216598966U - Leakage protection device capable of switching working modes and charging equipment - Google Patents
Leakage protection device capable of switching working modes and charging equipment Download PDFInfo
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Abstract
An earth leakage protection device and a charging apparatus with switchable operating modes, the device comprising: a leakage current sensor for sensing a leakage current signal; an external communication interface for receiving an external communication signal; the control circuit is connected with the leakage current inductor and the communication interface and used for switching working modes according to the external communication signal and generating an alarm signal in the corresponding working mode; and the output interface is connected with the control circuit and used for outputting the alarm signal. The leakage protection device is provided with an external communication interface, and the working modes are switched according to external communication signals received through the external communication interface, so that the same leakage protection device can adapt to different application environments and working modes.
Description
Technical Field
The present invention generally relates to the field of leakage detection, and more particularly to a leakage protection device and a charging apparatus capable of switching operating modes.
Background
An RCD (Residual Current Device) is a leakage protection Device for detecting the magnitude of leakage Current in a line. If no RCD is installed in the circuit, when a person or an animal contacts high voltage, leakage current can be generated to the ground, and when the leakage current exceeds a certain threshold value, the heart of the person or the animal can vibrate, so that the heart stops suddenly, and further life danger is caused. If the leakage protection device such as the RCD is installed in the circuit, when leakage current exists in the circuit and the magnitude of a leakage current signal exceeds a set threshold value, the RCD can send an alarm signal to the action mechanism to trigger the action mechanism to quickly break the circuit, so that the purpose of protecting life safety is achieved.
The action mechanism is mainly used for breaking a circuit of the rear end power supply, and when the circuit is broken, the rear end of the breaker does not have voltage and current, so that the protection purpose is realized. The RCD board-mounted leakage module is widely applied to charging piles and charging guns at present, can be directly installed on a circuit board, and when an electric automobile is charged, the RCD is used for detecting whether leakage current exceeds a threshold value in the charging process, if the leakage current exceeds the threshold value, the RCD can send out an alarm signal to other devices in the circuit board to execute a command of stopping charging and disconnect a charging circuit, such as a closed relay or a circuit breaker mechanism.
At present, the functions of the RCDs are relatively single, and different types of RCDs can only detect corresponding types of leakage signals, for example, an AC-type RCD can only detect AC-type leakage; the type a product is capable of detecting pulsating direct current and AC leakage, etc.
SUMMERY OF THE UTILITY MODEL
In the summary section a series of concepts in a simplified form is introduced, 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 electrical leakage protection device, including:
the leakage current inductor is used for inducing a leakage current signal;
the self-checking zero-checking pin is used for receiving a self-checking or zero-checking instruction, and is also used for receiving a mode selection instruction;
the control circuit is connected with the leakage current inductor and the self-checking zero-checking pin, and is used for switching a working mode according to a mode selection instruction received by the self-checking zero-checking pin and processing the leakage current signal in a corresponding working mode to generate an alarm signal;
and the output interface is connected with the control circuit and used for outputting the alarm signal.
In one embodiment, the control circuit comprises a timing circuit and a mode selection circuit which are connected in sequence, the timing circuit is used for calculating the time of the level change of the self-checking zero pin, and the mode selection circuit selects the working mode according to the time of the level change of the self-checking zero pin.
In one embodiment, the control circuit comprises at least two arithmetic units, each arithmetic unit corresponding to one working mode; the at least two arithmetic units are connected with the mode selection circuit, and the mode selection circuit activates the corresponding arithmetic units according to the mode selection instruction.
In one embodiment, the at least two operation units include a default operation unit corresponding to a default operation mode, and the default operation unit is automatically activated after the earth leakage protection device is powered off and restarted.
In one embodiment, the control circuit includes a memory unit configured to memorize a current operating mode and activate an operation unit corresponding to the current operating mode after the earth leakage protection device is powered off and restarted.
A second aspect of the present invention provides an electrical leakage protection device capable of switching operating modes, where the electrical leakage protection device includes:
the leakage current inductor is used for inducing a leakage current signal;
an external communication interface for receiving a mode selection instruction;
the self-checking zero-checking pin is used for receiving a self-checking or zero-checking instruction;
the control circuit is connected with the leakage current inductor, the external communication interface and the self-checking zero-checking pin, and is used for switching a working mode according to a mode selection instruction received by the external communication interface and processing the leakage current signal in a corresponding working mode to generate an alarm signal;
and the output interface is connected with the control circuit and used for outputting the alarm signal.
In one embodiment, the external communication interface comprises at least one of:
a single bus communication interface, a serial peripheral interface, an asynchronous serial communication interface, an I2C bus communication interface, a Bluetooth communication interface, a wireless fidelity communication interface, a GPRS communication interface, and a logic level communication interface.
In one embodiment, the external communication interface is further configured to receive and transmit a leakage protection threshold, and to transmit a magnitude of the leakage current signal and/or waveform information of the leakage current signal.
A fifth aspect of an embodiment of the present invention provides a charging apparatus, including: an earth leakage protection device as described above; and the action mechanism is connected with the leakage protection device and used for breaking a power supply line when receiving the alarm signal
According to the leakage protection device and the charging equipment, the mode switching function is added in the leakage protection device, the mode switching instruction is received according to the self-checking zero pin or the external communication interface, and the protection mode is switched according to the mode switching instruction, so that the same leakage protection device can be suitable for different working modes.
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 circuit diagram of a leakage protection device according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a leakage protection device according to another 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 utility model.
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 utility model 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, then 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 utility model. 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 provide a thorough understanding of the present invention, a detailed structure will be set forth in the following description in order to explain the present invention. The following detailed description of preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.
At present, RCD has relatively single function and is divided into AC type products, A type products, RDC-MD type products (MD type products for short), RDC-PD type products (PD product type products for short), B type products, UL standard products (UL type products for short) and the like. AC type products can only detect AC type leakage; the A-type product can detect pulsating direct current and AC type electric leakage and can meet the electric leakage requirements of IEC61008 standard and IEC61009 standard; the MD type product is mainly used for direct current 6mA protection (leakage waveforms comprise SDC, 2P-DC and 3P-DC), is a protection function realized by combining the requirement of installing an A type breaker at the front end of a charging pile and meeting the requirements of standard IEC62955 and the like, and is mainly used for preventing the A type breaker or the AC type breaker at the front end of the charging pile from losing efficacy when direct current leakage exists, and mainly for meeting the requirement of 62955 standard; the PD type product can realize the leakage detection of the type A and the leakage protection of the direct current 6mA, equivalently integrates the function of A +6 and mainly aims to meet the requirements of IEC62752 or 62955; the B-type product can detect all leakage current waveforms specified by IEC62423 standard, IEC61008(IEC61009) standard and the like; products of the UL standard are earth leakage protection products that meet the U.S. standard. The current RCD is only suitable for a single leakage protection function, and does not integrate functions of MD, PD, UL and the like.
Because the current earth leakage protection device is only suitable for the same earth leakage protection mode, the switching of multiple working modes of the same product cannot be realized, and in different application environments, clients must purchase earth leakage protection devices in different modes to adapt to different requirements.
Accordingly, embodiments of the present invention provide a leakage protection device with switchable protection functions to solve the above problems. The following describes an earth leakage protection device and a charging device in detail according to an embodiment of the present invention 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 leakage protection device according to the embodiment of the present invention includes a leakage current sensor 101 for sensing a leakage current signal; a self-checking zero-checking pin 103, configured to receive a self-checking or zero-checking instruction, where the self-checking zero-checking pin 103 is further configured to receive a mode selection instruction; the control circuit 102 is connected with the leakage current inductor 101 and the self-checking zero-checking pin 103, and is used for switching a working mode according to a mode selection instruction received by the self-checking zero-checking pin 103 and processing a leakage current signal in a corresponding working mode to generate an alarm signal, and the control circuit 102 is also used for performing self-checking or zero-checking on the leakage protection device when receiving a self-checking or zero-checking instruction; and the output interface 104 is connected with the control circuit 102 and used for outputting an alarm signal.
Illustratively, the embodiment of the present invention employs a fluxgate technology, and applies an excitation signal to the leakage current inductor 101, and the control circuit 102 collects a leakage current signal on the sampling resistor 105, converts the collected leakage current signal into a TRIP-OUT digital output mode, and outputs the TRIP-OUT digital output mode through the output interface 104.
Referring to fig. 1, the leakage current inductor 101 includes a zero sequence current transformer (ZCT) having a primary side three-phase wire passing through an iron core and a secondary coil wound around the iron core. Normally, the primary side three-phase current of the leakage current inductor is symmetrical, and the vector sum is zero. When the system has single-phase earth fault, the sum of three-phase currents is not zero, zero-sequence magnetic flux occurs in the iron core, the magnetic flux induces potential on the secondary coil, and secondary current is generated.
Illustratively, the leakage protection device further comprises a sampling resistor 105 disposed between the leakage current inductor 101 and the control circuit 102, and the control circuit 102 obtains the leakage current signal through the sampling resistor 105. And, also include setting up the oscillating circuit (OSC) between leakage current inductor 101 and control circuit 102, the control circuit 102 exerts the exciting current to the leakage current inductor through the oscillating circuit, in order to drive the ZCT coil, make its magnetic core magnetize, meanwhile, the control circuit 102 can obtain the waveform signal voltage information including exciting voltage waveform through detecting the voltage on the sampling resistor 105, the voltage information includes the information of the magnetic flux of the zero sequence too; the zero sequence magnetic flux information can be obtained by filtering the excitation waveform information through the filter, and the zero sequence magnetic flux is generated by the leakage current, so that the leakage current information can be obtained, and the function of detecting the alternating current leakage current and the direct current leakage current is realized.
Further, the earth leakage protection device may be activated in an open-loop or closed-loop manner. The excitation frequency in the open-loop excitation mode is generated by an oscillation circuit, the oscillation frequency is comprehensively determined according to the characteristics of different transformers and the magnitude of a driving current signal, and once the excitation frequency is determined, the excitation frequency is fixed and cannot be randomly modified in the application process. In the closed loop type excitation mode, the excitation frequency is related to characteristic parameters such as the turn number, Bm, coil excitation voltage, sectional area Ac and the like of the ZCT mutual inductor, a feedback signal is generated by comparing the voltage generated on the sampling resistor 105 with the voltage configured in advance by the comparator, the feedback signal is fed back to the control circuit 102, the frequency of the excitation current is adjusted until the circuit is in a stable state, and the excitation frequency also tends to be stable at the moment.
Illustratively, the control circuit 102 may be implemented as an MCU (micro control unit), but may also be implemented as other control units or circuits with similar functionality. Fig. 1 is a schematic diagram of magnetic modulation technology, and the earth leakage protection device of the embodiment of the present invention may be other types of circuits integrating a-type or AC-type circuits.
The control circuit 102 is connected to a self-checking zero-calibration pin (Test-IN)103, and the self-checking zero-calibration pin 103 of the present embodiment is used for receiving a mode selection instruction IN addition to a self-checking or zero-calibration instruction, thereby realizing multiplexing of pin functions. In one embodiment, the control circuit comprises a timing circuit and a mode selection circuit which are connected in sequence, the timing circuit is used for calculating the time of the level change of the self-checking zero pin 103, and the mode selection circuit selects the working mode according to the time of the level change of the self-checking zero pin 103. For example, if the self-checking zero pin 103 is normally at a high level, the type of the command may be determined according to the time when the self-checking zero pin 103 is pulled down. Different times correspond to the self-checking zero-calibration instruction and the mode selection instruction respectively, and different times correspond to different working modes.
For example, when the time for pulling down the self-checking zero-calibration pin 103 is 40ms to 100ms, it is determined that a self-checking or zero-calibration command is received, and the leakage protection device enters a self-checking or zero-calibration mode;
when the time for pulling down the level of the self-checking zero pin 103 is 100ms-150ms, the working mode selected by the mode selection instruction is indicated to be a PD mode;
when the time for pulling down the level of the self-checking zero pin 103 is 150ms-200ms, the working mode selected by the mode selection instruction is an MD mode;
when the time for pulling the zero calibration pin 103 to be low is 200ms-250ms, the working mode selected by the mode selection instruction is a TYPE B mode;
when the time for pulling down the level of the self-checking zero pin 103 is 250ms-300ms, the working mode selected by the mode selection instruction is indicated to be the UL standard working mode;
when the time for pulling the self-checking zero pin 103 to be low is 300ms-350ms, the mode selection instruction selects the A-type working mode.
Of course, the above time ranges are only examples, and the time corresponding to different instructions may be any recognizable time length.
Except that the instruction type is determined according to the pull-down time of the self-checking zero-checking pin 103, the same function can be realized by adopting a pull-up mode of inverse logic, namely, the self-checking zero-checking pin 103 is at a low level at ordinary times, and the instruction type is determined according to the pull-up time of the self-checking zero-checking pin 103.
In some embodiments, the control circuit comprises at least two arithmetic units, each arithmetic unit corresponding to one of the operation modes; at least two operation units are connected with the mode selection circuit, and at least two operation units are connected with the same output interface. The control circuit switches the working mode and activates the operation unit corresponding to the currently selected working mode.
In some embodiments, the at least two arithmetic units include a default arithmetic unit corresponding to a default operating mode. And when the electric leakage protection device is electrified again, the default operation unit is automatically activated. That is, the at least two operating modes include a default operating mode, which is automatically activated when the earth leakage protection device is powered up again, regardless of the operating mode applied before the earth leakage protection device is powered down. For example, if the default operating mode is PD mode, then the always PD mode is activated when the earth leakage protection device is powered back up.
In other embodiments, the control circuit 102 includes a memory unit for memorizing the currently adopted operation mode. When the earth leakage protection device is powered off and powered on again, the working mode memorized by the memory unit before power off is continuously activated, and even if the earth leakage protection device is powered on again after power off, the working mode cannot be changed unless the working mode is switched again through the self-checking zero pin 103.
Based on the above description, the leakage protection device of the present embodiment multiplexes the self-checking zero-calibration pin, so that the self-checking zero-calibration pin can implement both the self-checking zero-calibration function and the mode selection function, and after the mode selection function is added to the leakage protection device, the same product can adapt to different application environments and working modes, without requiring a user to replace the leakage protection device or configure multiple sets of leakage protection devices, thereby saving development cost and time, and implementing free switching of the working modes of the client.
Referring to fig. 2, another aspect of the embodiment of the present invention provides an electrical leakage protection device, including a leakage current sensor 201 for sensing a leakage current signal; an external communication interface 203 for receiving a mode selection instruction; a self-checking zero-checking pin 204 for receiving a self-checking or zero-checking instruction; the control circuit 202 is connected with the leakage current inductor 201, the external communication interface 203 and the self-checking zero-checking pin 204, and is used for switching a working mode according to a mode selection instruction received by the external communication interface and processing the leakage current signal in a corresponding working mode to generate an alarm signal, and the control circuit 202 is also used for self-checking or zero-checking the leakage protection device when receiving a self-checking or zero-checking instruction; and the output interface 205 is connected with the control circuit 202 and used for outputting an alarm signal. Illustratively, the leakage protection device further includes a sampling resistor 206 disposed between the leakage current inductor 201 and the control circuit 202, and the control circuit 202 obtains the leakage current signal through the sampling resistor 206.
Illustratively, the external communication interface 203 may be a wired communication interface or a wireless communication interface, including at least one of: a single bus communication interface using a single bus communication technique, a Serial Peripheral Interface (SPI) using an SPI bus communication technique, an asynchronous serial communication (UART) interface using a UART bus communication technique, an I2C bus communication interface using an I2C bus communication technique, a bluetooth communication interface using a bluetooth communication technique, a wireless fidelity (Wifi) communication interface using a Wifi communication technique, a GPRS communication interface using a GPRS communication technique, and a logic level communication interface using logic level control.
Further, in addition to being able to transmit the mode selection instruction, the earth leakage protection threshold may also be received and transmitted through the external communication interface 203. The leakage protection threshold value is a current threshold value for triggering leakage protection, and when the magnitude of a leakage current signal exceeds the leakage protection threshold value, the breaking of a power supply line is triggered. The external communication interface 203 can also be used for sending waveform information of the leakage current signal, so that the client can deeply know detailed information of the leakage current and upload the information to other network centers through a networking function to realize information interconnection.
Based on the above description, the leakage protection device of the embodiment adds an external communication interface for implementing a mode selection function, so that the same product can adapt to different application environments and working modes, a user does not need to replace the leakage protection device or configure multiple sets of leakage protection devices, development cost and time are saved, and free switching of working modes of clients is achieved.
The embodiment of the utility model also provides charging equipment which comprises the leakage protection device and an action mechanism connected with the leakage protection device, wherein the action mechanism is used for disconnecting the power supply circuit when the leakage protection device detects that the magnitude of the leakage current signal is greater than a preset threshold value. The charging equipment of the embodiment of the utility model can be realized as charging equipment for charging vehicles, such as a charging pile, a charging gun and the like, the leakage protection device can be a board-mounted leakage protection device which can be directly mounted on a PCB (printed Circuit Board) of the charging equipment, when the charging equipment charges an electric automobile, the leakage protection device can be used for detecting whether the magnitude of leakage current exceeds a threshold value in the charging process, and sending an alarm signal to an MCU (microprogrammed control Unit) or other devices on the PCB when the magnitude of the leakage current exceeds the threshold value so as to execute a charging breaking command, and a charging circuit of an actuating mechanism, such as a closed relay or a breaker mechanism and the like, is broken.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the utility model 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 utility model, various features of the utility model 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, this invention should not be construed as reflecting the intent: that the utility model 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 utility model 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 utility model, 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 utility model 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 can 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 purpose of describing the embodiments of the present invention or the description thereof, and the 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 shall cover the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An earth leakage protection device with switchable operation modes, characterized in that the earth leakage protection device comprises:
the leakage current inductor is used for inducing a leakage current signal;
the self-checking zero-checking pin is used for receiving a self-checking or zero-checking instruction, and is also used for receiving a mode selection instruction;
the control circuit is connected with the leakage current inductor and the self-checking zero-checking pin, and is used for switching a working mode according to a mode selection instruction received by the self-checking zero-checking pin and processing the leakage current signal in a corresponding working mode to generate an alarm signal;
and the output interface is connected with the control circuit and used for outputting the alarm signal.
2. The earth leakage protection device of claim 1 wherein said control circuit comprises a timing circuit and a mode selection circuit connected in series, said timing circuit for calculating the time of said self-zero-checking pin level change, said mode selection circuit selecting a mode of operation based on the time of said self-zero-checking pin level change.
3. A residual-current protection device according to claim 2, characterized in that said control circuit comprises at least two arithmetic units, each arithmetic unit corresponding to an operating mode; the at least two arithmetic units are connected with the mode selection circuit, and the mode selection circuit activates the corresponding arithmetic units according to the mode selection instruction.
4. The earth leakage protection device of claim 3, wherein said at least two computing units comprise a default computing unit corresponding to a default operating mode, said default computing unit being automatically activated after said earth leakage protection device is powered off and restarted.
5. The earth leakage protection device of claim 3, wherein said control circuit comprises a memory unit for memorizing a current operation mode and activating an operation unit corresponding to said current operation mode after the earth leakage protection device is powered off and restarted.
6. An earth leakage protection device with switchable operation modes, characterized in that the earth leakage protection device comprises:
the leakage current inductor is used for inducing a leakage current signal;
an external communication interface for receiving a mode selection instruction;
the self-checking zero-checking pin is used for receiving a self-checking or zero-checking instruction;
the control circuit is connected with the leakage current inductor, the external communication interface and the self-checking zero-checking pin, and is used for switching a working mode according to a mode selection instruction received by the external communication interface and processing the leakage current signal in a corresponding working mode to generate an alarm signal;
and the output interface is connected with the control circuit and used for outputting the alarm signal.
7. A residual current device as claimed in claim 6, characterized in that said external communication interface comprises at least one of the following:
a single bus communication interface, a serial peripheral interface, an asynchronous serial communication interface, an I2C bus communication interface, a Bluetooth communication interface, a wireless fidelity communication interface, a GPRS communication interface, and a logic level communication interface.
8. The earth leakage protection device of claim 6 wherein the external communication interface is further configured to receive and transmit an earth leakage protection threshold, and to transmit a magnitude of the earth leakage current signal and/or waveform information of the earth leakage current signal.
9. A charging apparatus, characterized in that the charging apparatus comprises:
the earth leakage protection device of any one of claims 1-8;
and the action mechanism is connected with the leakage protection device and used for breaking the power supply circuit when receiving the alarm signal.
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| CN202122510310.6U CN216598966U (en) | 2021-10-18 | 2021-10-18 | Leakage protection device capable of switching working modes and charging equipment |
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| CN202122510310.6U CN216598966U (en) | 2021-10-18 | 2021-10-18 | Leakage protection device capable of switching working modes and charging equipment |
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