CN113889968A - Electric leakage protection device and method with switchable protection modes and alternating-current charging pile - Google Patents

Electric leakage protection device and method with switchable protection modes and alternating-current charging pile Download PDF

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CN113889968A
CN113889968A CN202111212044.7A CN202111212044A CN113889968A CN 113889968 A CN113889968 A CN 113889968A CN 202111212044 A CN202111212044 A CN 202111212044A CN 113889968 A CN113889968 A CN 113889968A
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signal
mode
protection
leakage
protection device
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徐首旗
阳明
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Shanghai Shengwei Electronic Technology Co ltd
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Shanghai Shengwei Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A leakage protection device with switchable protection modes, a method and an alternating current charging pile are provided, wherein the leakage protection device is provided with a first output pin and a first input pin, the first input pin is used for receiving an external input signal, the external signal comprises a first signal or a second signal, and the first output pin is used for outputting a leakage early warning signal; the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the first input pin and the first output pin, the mode switching circuit is switched to the first protection mode when receiving the first signal and is switched to the second protection mode when receiving the second signal, and the leakage early warning signal corresponding to the first protection mode or the leakage early warning signal corresponding to the second protection mode is output through the first output pin. The leakage protection device, the leakage protection method and the alternating-current charging pile can meet the requirement of switching protection modes and control the cost.

Description

Electric leakage protection device and method with switchable protection modes and alternating-current charging pile
Technical Field
The invention relates to the field of electric leakage detection, in particular to an electric leakage protection device with switchable protection modes, an electric leakage protection method and an alternating current charging pile.
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 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 RCD is widely used in charging pile and charging gun at present, and it can be installed directly on the circuit board, and when electric automobile charges, the RCD is used for detecting whether the leakage current exceeds the threshold value in the charging process, if exceed the threshold value, the RCD can send out alarm signal to other devices in the circuit board to carry out the order of stopping charging, and break the circuit that charges, for example open closed relay or circuit breaker mechanism etc..
At present, the RCD reference standard used in the electric vehicle ac charging pile in mode 3 (i.e., when the electric vehicle is connected to the power supply network, the electric vehicle is directly connected to the ac power grid by using the power supply equipment equipped with a control guidance Device) is IEC62955, in this standard, the RCD is functionally divided into an RDC-PD (Residual Direct Current-Protective Device) mode and an RDC-MD (Residual Direct Current-Monitoring Device) mode.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the 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.
In one aspect, the present invention provides a leakage protection device with switchable protection modes, where the leakage protection device has a first output pin and a first input pin, the first input pin is used to receive an external input signal, the external signal includes a first signal or a second signal, and the first output pin is used to output a leakage early warning signal;
the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the first input pin and the first output pin, the mode switching circuit is switched to a first protection mode when receiving the first signal, is switched to a second protection mode when receiving the second signal, and outputs a leakage early warning signal corresponding to the first protection mode or a leakage early warning signal corresponding to the second protection mode through the first output pin.
In one embodiment, the first protection mode is an RDC-PD mode under the IEC62955 standard, and the second protection mode is an RDC-MD mode under the IEC62955 standard.
In one embodiment, the earth leakage protection device is connected with a type A residual current circuit breaker and a controller of a charging device, the first output pin is connected with a second input pin of the controller, and the first input pin is connected with a second output pin of the controller.
In one embodiment, the first signal is a high level signal and the second signal is a low level signal, or the first signal is a low level signal and the second signal is a high level signal.
In one embodiment, the earth leakage protection device comprises a single zero sequence current transformer.
A second aspect of the embodiments of the present invention provides an electrical leakage protection system, including an electrical leakage protection device and a signal switching circuit, where: the leakage protection device is provided with an output pin and an input pin, and the signal switching circuit is connected with the input pin; the signal switching circuit is used for generating a first signal or a second signal and outputting the first signal or the second signal to the leakage protection device through the input pin; the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the output pin and the input pin, the mode switching circuit is switched to a first protection mode when receiving the first signal, is switched to a second protection mode when receiving the second signal, and outputs a leakage early warning signal corresponding to the first protection mode or a leakage early warning signal corresponding to the second protection mode through the first output pin.
In one embodiment, the signal switching circuit outputs a first signal corresponding to the RDC-PD mode when the type a residual current circuit breaker is not detected, and outputs a second signal corresponding to the RDC-MD mode when the type a residual current circuit breaker is detected.
In one embodiment, the signal switching circuit is a push-pull circuit or an open drain circuit.
A third aspect of the embodiments of the present invention provides a leakage protection method with switchable protection modes, where the method includes:
receiving an external input signal, wherein the external signal comprises a first signal or a second signal;
switching to a first protection mode when the first signal is received, switching to a second protection mode when the second signal is received, and generating a leakage early warning signal in the first protection mode or generating a leakage early warning signal in the second protection mode;
and outputting the electric leakage early warning signal corresponding to the first protection mode or the electric leakage early warning signal corresponding to the second protection mode.
In one embodiment, the first signal and the second signal are generated by a controller of the ac charging post.
In one embodiment, the first protection mode is an RDC-PD mode under the IEC62955 standard, and the second protection mode is an RDC-MD mode under the IEC62955 standard, the method further comprising:
the controller outputs a first signal corresponding to the RDC-PD mode when the A type residual current circuit breaker is not detected, and outputs a second signal corresponding to the RDC-MD mode when the A type residual current circuit breaker is detected.
A fourth aspect of the present invention provides an ac charging pile, including: the leakage protection device with switchable protection modes is connected with an alternating current power grid; and the main control relay is connected with the electric leakage protection device and the vehicle-mounted charger.
According to the leakage protection device with switchable protection modes, the method and the alternating-current charging pile provided by the embodiment of the invention, the signal for switching the protection modes is received through the input pin of the leakage protection device, and the leakage early warning signals of different protection modes are output through the output pin of the leakage protection device, so that the requirement for switching the protection modes can be met, and the cost is controlled.
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 block diagram illustrating a structure of a conventional charging pile;
fig. 2 is a block diagram illustrating a structure of another conventional charging pile;
fig. 3 is a block diagram of a leakage protection device with switchable protection modes according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a leakage protection method with switchable protection modes 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 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, 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 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 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 invention, however, the invention is capable of other embodiments in addition to those detailed.
At present, most of electric vehicle alternating-current charging piles conforming to the mode 3 only conform to one protection mode in IEC62955, namely the RDC-PD mode or the RDC-MD mode. The differences between the RDC-PD mode and the RDC-MD mode are shown in the following Table 1:
TABLE 1
Figure BDA0003309290790000051
Thus, there is a limit to the usage scenario: for a charging pile using an RDC-PD mode, an A-type residual current circuit breaker does not need to be installed at the front stage; for the charging pile using the RDC-MD mode, an A-type residual current circuit breaker must be installed at the front stage of the charging pile. The alternating-current charging pile capable of switching the protection mode mainly comprises the following two forms:
referring to fig. 1, a first form is to use two leakage protection devices, one of which is in RDC-PD mode and the other of which is in RDC-MD mode, and the two leakage protection devices are connected to a controller respectively, and the controller selects whether to use a signal a from RDC-PD mode or a signal B from RDC-MD.
Referring to fig. 2, in a second form, two output pins are provided on a leakage protection device, one output pin is used for outputting a signal in an RDC-PD mode, and the other output pin is used for outputting a signal in an RDC-MD mode, the leakage protection device executes two protection modes simultaneously, and a controller selects whether to adopt a signal a in the RDC-PD mode or a signal B in the RDC-MD mode according to requirements.
The ac charging post shown in fig. 1 uses two earth leakage protection devices, which doubles the cost, and the two earth leakage protection devices occupy more space and are more difficult to install.
The AC charging post shown in fig. 2 uses the same leakage protection device, and one leakage protection device needs to completely distinguish between the PD characteristic and the MD characteristic, and therefore it is necessary to accurately determine the AC and the DC within the full Current range.
In view of the above problems, embodiments of the present invention provide an electric leakage protection device and an ac charging pile with switchable protection modes, where the electric leakage protection device only executes one protection mode at the same time, and switches the protection modes according to a signal output by a controller, so that not only can the requirement for switching the protection modes be met, but also the cost is controlled.
The following describes a leakage protection device and an ac charging post with switchable protection modes 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. 3, the leakage protection device 310 with switchable protection modes according to the embodiment of the present invention has a first output pin and a first input pin, where the first input pin is configured to receive an external input signal, the external signal includes a first signal or a second signal, and the first output pin is configured to output a leakage warning signal; the leakage protection device 310 further includes a mode switching circuit, where the mode switching circuit is connected to the first input pin and the first output pin, switches to the first protection mode when receiving the first signal, switches to the second protection mode when receiving the second signal, and outputs a leakage warning signal corresponding to the first protection mode or a leakage warning signal corresponding to the second protection mode through the first output pin.
Considering that the ac charging pile of the electric vehicle only adopts one protection mode at a certain time, for example, the RDC-PD protection mode or the RDC-MD protection mode, but not both modes, in the embodiment of the present invention, the first input pin is configured in the leakage protection device 310, and the switching of the protection mode is realized based on a signal received by the first input pin.
Illustratively, the earth leakage protection device is connected to the controller 320 of the ac charging post, the first output pin is connected to the second input pin of the controller 320, and the first input pin is connected to the second output pin of the controller 320. The controller 320 of the ac charging post outputs the first signal or the second signal to the first input pin of the earth leakage protection device through the second output pin.
When the charging pile needs to start the first protection mode, the controller 320 outputs a first signal representing the first protection mode through the second output pin, the mode switching circuit of the leakage protection device 310 switches to the first protection mode, and the leakage protection device 310 outputs a leakage early warning signal representing the first protection mode to the controller 320 through the first output pin; when the charging pile needs to enable the second protection mode, the controller 320 outputs a second signal representing the second protection mode through the second output pin, the mode switching circuit of the leakage protection device 310 switches to the second protection mode, and the leakage protection device 310 outputs a leakage early warning signal representing the second protection mode to the controller 320 through the first output pin.
Therefore, the earth leakage protection device 310 can be switched to different protection modes as required, so that the protection modes can be switched on the basis of the same product and under the same set of input and output interfaces, and the cost is controlled. The embodiment of the invention completely separates the protection modes, and has the advantages of simple algorithm, short development period and low cost. The customer can stock more at will and freely choose the final protection mode.
In one embodiment, the first protection mode is a RDC-PD (Residual Direct Current-Protective Device) mode under IEC62955 standard, and the second protection mode is a RDC-MD (Residual Direct Current-Monitoring Device) mode under IEC62955 standard. The leakage current waveform detected in the RDC-PD mode is alternating current, pulse direct current and 6mA direct current, and the leakage current waveform detected in the RDC-MD mode is 6mA direct current. The leakage protection device provided by the embodiment of the invention can realize free switching between the RDC-PD mode and the RDC-MD mode based on one set of hardware equipment. Illustratively, when to switch which mode is determined by the controller 320. For example, the controller may detect whether a type a residual current circuit breaker is installed in the main circuit, and if so, output a signal representing the RDC-MD mode, and if not, output a signal representing the RDC-PD mode.
In addition to the RDC-PD mode and RDC-MD mode under IEC62955 standard, the first protection mode and the second protection mode related to the present invention may also include any switchable protection mode under standards such as UL2231, IEC62955, IEC62423, and the like. In addition to the first protection mode and the second protection mode, the switchable protection modes may further include at least one third protection mode, and when receiving a third signal, the mode switching circuit switches the leakage protection device 310 to the third protection mode, and outputs a leakage warning signal corresponding to the third protection mode through the first output pin. Therefore, even if the number of preset protection modes is large, only one output pin for outputting the electric leakage early warning signal is provided all the time, and excessive MCU pin resources are avoided being consumed.
In one embodiment, the first signal and the second signal are high-low level signals, that is, the first signal is a high-level signal and the second signal is a low-level signal, or the first signal is a low-level signal and the second signal is a high-level signal. For example, when the charging post requires the RCD-PD mode, the second output pin may be set low (or high), and the earth leakage protection device 310 outputs a signal a representing the RCD-PD mode to the controller 320; when the charging post requires the protection mode of the RCD-MD, the second output pin may be set high (or low), and the earth leakage protection device 310 outputs a signal B representing the RCD-MD mode to the controller 320. In this embodiment, the signal switching circuit may also be a push-pull circuit or an open drain circuit.
In some embodiments, the earth leakage protection device is connected with a type A residual current circuit breaker. Illustratively, when the type a residual current circuit breaker is provided, the RCD-PD mode or the RCD-MD mode may be employed in the same ac charging post, and when the type a residual current circuit breaker is not provided, only the RCD-MD mode may be employed. Therefore, alternating current charging piles with different configurations can adopt the leakage protection device provided by the embodiment of the invention.
The earth leakage protection device 310 of the embodiment of the present invention includes a unique Zero sequence Current Transformer (ZCT). Illustratively, a primary side three-phase wire of the zero-sequence current transformer penetrates through an iron core, and a secondary coil is wound on the iron core. Under normal conditions, three-phase currents on the primary side of the zero-sequence current transformer are symmetrical, and the vector sum is zero. When a single-phase earth fault occurs, the sum of three-phase currents is not zero, zero-sequence magnetic flux occurs in the iron core, and the magnetic flux induces electric potential on the secondary coil and generates secondary current.
The leakage protection device 310 of the embodiment of the present invention further includes a unique Micro Control Unit (MCU). The micro control unit is connected with the zero sequence current transformer and used for judging whether electric leakage occurs or not according to the secondary current.
In some embodiments, the leakage protection device 310 further includes a sampling resistor disposed between the zero sequence current transformer and the micro control unit, and the micro control unit obtains the leakage current signal through the sampling resistor.
In some embodiments, the earth leakage protection device 310 further includes an oscillation circuit (OSC) disposed between the zero sequence current transformer and the micro control unit, the micro control unit applies an excitation current to the zero sequence current transformer through the oscillation circuit to drive the ZCT coil so as to magnetize the magnetic core thereof, and meanwhile, the micro control unit obtains waveform signal voltage information including an excitation voltage waveform by detecting a voltage across the sampling resistor, wherein the voltage information also includes information of the zero sequence magnetic flux; 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 310 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. The excitation frequency in the closed loop type excitation mode 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 with the voltage configured in advance by the comparator, the feedback signal is fed back to an excitation circuit in the micro control unit, 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.
Based on the above description, the leakage protection device with switchable protection modes according to the embodiment of the invention realizes free switching of the protection modes based on the same set of products, and not only can meet the requirement of switching the protection modes, but also can control the cost.
In another aspect, an embodiment of the present invention provides a leakage protection system with switchable protection modes, including a signal switching circuit, a leakage protection device, and a signal switching circuit, where the leakage protection device has an output pin and an input pin, and the signal switching circuit is connected to the input pin; the signal switching circuit is used for generating a first signal or a second signal and outputting the first signal or the second signal to the electric leakage protection device through the input pin; the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the output pin and the input pin, the mode switching circuit is switched to a first protection mode when receiving the first signal and is switched to a second protection mode when receiving the second signal, and a leakage early warning signal corresponding to the first protection mode or a leakage early warning signal corresponding to the second protection mode is output through the first output pin.
The signal switching circuit can be a controller of the alternating current charging pile, and can also be other signal switching circuits. The signal switching circuit can adaptively output the first signal or the second signal, and can also output the first signal or the second signal according to a user instruction. For example, the signal switching circuit may output a first signal corresponding to the RDC-PD mode when the type a residual current circuit breaker is not detected, and output a second signal corresponding to the RDC-MD mode when the type a residual current circuit breaker is detected.
Illustratively, the first signal and the second signal are high-low level signals, that is, the first signal is a high-level signal and the second signal is a low-level signal, or the first signal is a low-level signal and the second signal is a high-level signal. In this embodiment, the signal switching circuit may be a push-pull circuit or an open drain circuit capable of switching high and low level signals.
The leakage protection system with switchable protection modes, provided by the embodiment of the invention, realizes free switching of the protection modes based on the same set of products, and can meet the requirement of switching the protection modes and control the cost. For more details of the leakage protection system, reference may be made to the above description, which is not repeated herein.
An embodiment of the present invention further provides a leakage protection method with switchable protection modes, and referring to fig. 4, the leakage protection method 400 with switchable protection modes includes:
receiving an external input signal including a first signal or a second signal at step S410;
in step S420, switching to a first protection mode when receiving the first signal, and switching to a second protection mode when receiving the second signal, and generating an electric leakage warning signal in the first protection mode, or generating an electric leakage warning signal in the second protection mode;
in step S430, an electric leakage warning signal corresponding to the first protection mode or an electric leakage warning signal corresponding to the second protection mode is output.
The leakage protection method 400 of the present embodiment may be performed by the leakage protection device 310 as described above.
In step S410, the earth leakage protection device receives an external input signal through the input pin. The different types of external input signals represent different types of protection modes, and specifically, the external input signals at least include a first signal corresponding to a first protection mode and a second signal corresponding to a second protection mode. Namely, the leakage protection method of the embodiment of the invention is switched between at least two protection modes.
Wherein the first signal and the second signal may be generated by a controller of the ac charging post. Specifically, an input pin of the earth leakage protection device is connected with an output pin of the controller, after the controller determines a protection mode needing to be switched, the controller outputs a first signal or a second signal to the earth leakage protection device through the output pin of the earth leakage protection device, and the earth leakage protection device switches the protection mode according to the received signal.
In one embodiment, the first protection mode is an RDC-PD mode under the IEC62955 standard, the second protection mode is an RDC-MD mode under the IEC62955 standard, and the controller outputs a first signal corresponding to the RDC-PD mode when the A type residual current circuit breaker is not detected and outputs a second signal corresponding to the RDC-MD mode when the A type residual current circuit breaker is detected. Of course, in addition to the RDC-PD mode and RDC-MD mode under the IEC62955 standard, the switchable protection modes may include any protection mode under the standards of UL2231, IEC62955, IEC62423, and the like.
Based on the above description, the leakage protection method with switchable protection modes according to the embodiment of the present invention realizes that when the client determines which protection mode the leakage protection device is switched to, which can not only meet the requirement of switching the protection modes, but also control the cost.
The embodiment of the invention also provides an alternating current charging pile which comprises the electric leakage protection device with the switchable protection modes, wherein the electric leakage protection device is connected with an alternating current power grid; the alternating-current charging pile further comprises a master control relay which is connected with the electric leakage protection device and a vehicle-mounted charger (vehicle-mounted OBC).
The alternating-current charging pile can charge an electric vehicle, wherein the electric leakage protection device with the switchable protection modes can be a board-mounted electric leakage protection device which can be directly mounted on a PCB (printed circuit board) of the alternating-current charging pile.
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 invention and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present invention should not be construed to reflect the intent: that 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 may 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 embodiment of the present invention or the description thereof, and the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein 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 (13)

1. The leakage protection device with switchable protection modes is characterized by comprising a first output pin and a first input pin, wherein the first input pin is used for receiving an external input signal, the external signal comprises a first signal or a second signal, and the first output pin is used for outputting a leakage early warning signal;
the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the first input pin and the first output pin, the mode switching circuit is switched to a first protection mode when receiving the first signal, is switched to a second protection mode when receiving the second signal, and outputs a leakage early warning signal corresponding to the first protection mode or a leakage early warning signal corresponding to the second protection mode through the first output pin.
2. A leakage protection device with switchable protection modes as claimed in claim 1, wherein the leakage protection device is connected to a controller of an ac charging post, the first output pin is connected to a second input pin of the controller, and the first input pin is connected to a second output pin of the controller.
3. A switchable earth leakage protection device according to claim 1, characterized in that said earth leakage protection device is connected to a type a residual current circuit breaker.
4. A switchable leakage protection device according to claim 1, wherein the first signal is a high signal and the second signal is a low signal, or wherein the first signal is a low signal and the second signal is a high signal.
5. A leakage protection device with switchable protection modes according to claim 1, characterized in that the leakage protection device comprises a single zero sequence current transformer.
6. A leakage protection device with switchable protection modes according to any of claims 1-5, characterized in that the first protection mode is an RDC-PD mode under the IEC62955 standard and the second protection mode is an RDC-MD mode under the IEC62955 standard.
7. A leakage protection system with switchable protection modes, comprising a leakage protection device and a signal switching circuit, wherein:
the leakage protection device is provided with an output pin and an input pin, and the signal switching circuit is connected with the input pin;
the signal switching circuit is used for generating a first signal or a second signal and outputting the first signal or the second signal to the leakage protection device through the input pin;
the leakage protection device further comprises a mode switching circuit, the mode switching circuit is connected with the output pin and the input pin, the mode switching circuit is switched to a first protection mode when receiving the first signal, is switched to a second protection mode when receiving the second signal, and outputs a leakage early warning signal corresponding to the first protection mode or a leakage early warning signal corresponding to the second protection mode through the output pin.
8. A leakage protection system with switchable protection modes according to claim 7, wherein the signal switching circuit outputs a first signal corresponding to the RDC-PD mode when no type a residual current circuit breaker is detected and outputs a second signal corresponding to the RDC-MD mode when a type a residual current circuit breaker is detected.
9. A switchable leakage protection system according to claim 7 wherein the signal switching circuit is a push-pull circuit or an open leakage circuit.
10. A leakage protection method with switchable protection modes, the method comprising:
receiving an external input signal, wherein the external signal comprises a first signal or a second signal;
switching to a first protection mode when the first signal is received, switching to a second protection mode when the second signal is received, and generating a leakage early warning signal in the first protection mode or generating a leakage early warning signal in the second protection mode;
and outputting the electric leakage early warning signal corresponding to the first protection mode or the electric leakage early warning signal corresponding to the second protection mode.
11. A leakage protection method switchable between protection modes according to claim 10, wherein the first signal and the second signal are generated by a controller of an ac charging post.
12. The protection mode switchable leakage protection method of claim 11, wherein the first protection mode is an RDC-PD mode under IEC62955 standard, and the second protection mode is an RDC-MD mode under IEC62955 standard, the method further comprising:
the controller outputs a first signal corresponding to the RDC-PD mode when the A type residual current circuit breaker is not detected, and outputs a second signal corresponding to the RDC-MD mode when the A type residual current circuit breaker is detected.
13. An alternating current charging pile, characterized in that, alternating current charging pile includes:
the switchable earth leakage protection device of any of claims 1-9, the earth leakage protection device being connected to an alternating current grid;
and the main control relay is connected with the electric leakage protection device and the vehicle-mounted charger.
CN202111212044.7A 2021-10-18 2021-10-18 Electric leakage protection device and method with switchable protection modes and alternating-current charging pile Pending CN113889968A (en)

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CN202111212044.7A CN113889968A (en) 2021-10-18 2021-10-18 Electric leakage protection device and method with switchable protection modes and alternating-current charging pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111212044.7A CN113889968A (en) 2021-10-18 2021-10-18 Electric leakage protection device and method with switchable protection modes and alternating-current charging pile

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CN113889968A true CN113889968A (en) 2022-01-04

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