CN218848304U - Leakage current monitoring device and related electrical equipment - Google Patents
Leakage current monitoring device and related electrical equipment Download PDFInfo
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- CN218848304U CN218848304U CN202222533141.2U CN202222533141U CN218848304U CN 218848304 U CN218848304 U CN 218848304U CN 202222533141 U CN202222533141 U CN 202222533141U CN 218848304 U CN218848304 U CN 218848304U
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Abstract
Embodiments of the present disclosure relate to a leakage current monitoring device (10) and related electrical equipment. This leakage current monitoring device includes: a leakage sensor (1) for detecting a leakage current and generating a leakage current signal; a controller (2) coupled to the leakage sensor (1) and configured to output different display control signals based on different leakage current values indicated by the leakage current signal; and a display device (3) coupled to the controller (2) and configured to display or indicate different leakage current information based on the different display control signals.
Description
Technical Field
The present disclosure relates to the field of earth leakage protection, and more particularly to an earth leakage current monitoring device and related electrical equipment.
Background
The leakage protector, referred to as leakage switch for short, is mainly used for starting a leakage protection function when a leakage fault occurs to equipment so as to avoid the damage to the equipment and/or a human body. Earth leakage protectors have wide application in the electrical field.
Typically, the earth leakage protector may use a zero sequence transformer as a sensor of the leakage current, and its basic principle is: residual current (or leakage current) in the system is sensed by using a zero sequence transformer, and the circuit is immediately operated within a limited time to be disconnected when the residual current reaches an operation current value limited by a protector.
SUMMERY OF THE UTILITY MODEL
It is an object of the present disclosure to provide an improved leakage current monitoring device which at least displays or indicates a leakage current condition.
According to a first aspect of the present disclosure, a leakage current monitoring device is provided. This leakage current monitoring device includes: a leakage current sensor for detecting a leakage current and generating a leakage current signal; a controller coupled to the leakage sensor and configured to output different display control signals based on different leakage current values indicated by the leakage current signal; and a display device coupled to the controller and configured to display or indicate different leakage current information based on the different display control signal.
It is easy to understand that the leakage current monitoring device can easily realize the grading display or early warning of the leakage current, thereby being beneficial to a user to more comprehensively and timely master the leakage condition of a circuit and timely troubleshoot hidden dangers.
In some embodiments, the display device includes a plurality of sets of light emitting diodes, each set of light emitting diodes having a corresponding control switch configured to be turned on or off based on the display control signal so as to light on or off a corresponding set of light emitting diodes, a combination of lighting or extinguishing states of the plurality of sets of light emitting diodes being adapted to indicate the different leakage current information.
In some embodiments, each group of light emitting diodes is connected in series or in parallel with a corresponding control switch.
In some embodiments, the display control signal is a display control signal encoded by the controller.
In some embodiments, the leakage current monitoring device further comprises: a decoder coupled between the controller and the display device to decode the encoded display control signal and transmit the decoded display control signal to the display device.
In some embodiments, the control switch is a transistor having a gate connected to the output of the decoder.
In some embodiments, different sets of the light emitting diodes are further configured to emit different colors of light.
In some embodiments, the display device is further configured to: displaying or indicating the different leakage current information using different colors based on the different display control signals.
In some embodiments, the display device comprises a liquid crystal display.
According to a second aspect of the present disclosure, an electrical device is provided. The electrical apparatus comprises a leakage current monitoring device according to the first aspect.
It should also be understood that the statements described in this summary are not intended to limit the critical or essential features of the embodiments of the disclosure, nor are they intended to limit the scope of the disclosure. Other features of the embodiments of the present disclosure will become readily apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
fig. 1 shows a schematic diagram of a leakage current monitoring device according to an example embodiment of the present disclosure; and
fig. 2 illustrates an exemplary arrangement of a display device including multiple sets of light emitting diodes according to an exemplary embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and the embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
As mentioned above, earth leakage protectors have a wide range of applications in the electrical field. However, the inventors found that: the current earth leakage protector product only has the function of directly starting and disconnecting the circuit in response to a preset leakage current value usually, but cannot display the leakage current condition of the circuit, so that installation and debugging personnel are not facilitated to give out proper range selection according to actual leakage current distribution, and later inspection personnel are not facilitated to find out the abnormal change condition of the leakage current in time.
To this end, the idea of the present disclosure is to provide a leakage current monitoring device that may display or indicate information related to different leakage current values. Specifically, the leakage current monitoring device includes: a leakage current sensor for detecting a leakage current and generating a leakage current signal; a controller coupled to the leakage sensor and configured to output different display control signals based on different leakage current values indicated by the leakage current signal; and a display device coupled to the controller and configured to display or indicate different leakage current information based on the different display control signals.
Fig. 1 shows a schematic diagram of a leakage current monitoring device according to an example embodiment of the present disclosure. As shown in fig. 1, the leakage current monitoring device 10 may mainly include a leakage sensor 1, a controller 2, and a display device 3.
The main role of the leakage sensor 1 is to monitor the leakage current of an electrical device or system and to generate a leakage current signal accordingly.
Merely as an example, the leakage sensor 1 may be, for example, a zero sequence transformer, which is adapted to output a zero sequence current on the secondary side of the transformer when an electric shock or a leakage fault occurs on the primary side line. It will be readily appreciated that other types of sensors for monitoring leakage current and generating a leakage current signal are possible.
It is also readily understood that the leakage current signal generated by the leakage sensor 1 may itself indicate the magnitude of the leakage current value. As will be described later, the present disclosure is directed to display or indication of different leakage current information based on the above-described leakage current values of different magnitudes.
The controller 2 is coupled to the leakage sensor 1. By way of example only, the controller 2 may be, for example, a microcontroller, which may be, for example, a chip of the STM32L4 family.
In some particular embodiments, the controller 2 may be directly coupled to the electrical leakage sensor 1. More generally, however, as shown in fig. 1, in some embodiments, the leakage sensor 1 needs to be connected to the controller 2 via an amplifier 4 and/or a filter 5, wherein the amplifier 3 is used to implement amplification of the leakage current signal generated by the leakage sensor 1, and the filter 5 is used to implement filtering of the leakage current signal, which signal processing is advantageous for accurately obtaining the leakage current signal of the leakage sensor 1 described above. Further, in further embodiments, the leakage sensor 1 may also be coupled to the controller 2 via an analog-to-digital converter 6, which analog-to-digital converter 6 may be used to enable digitization of the leakage current signal, which is particularly advantageous for controllers 2 of a digital type.
The controller 2 functions to output different display control signals based on different leakage current values indicated by the leakage current signal of the leakage sensor 1. That is, the controller 2 may classify or evaluate the value of the leakage current signal of the leakage sensor 1 and then output a corresponding display control signal.
For example, in some embodiments, the step of outputting different display control signals based on different values of the leakage current indicated by the leakage current signal of the leakage sensor may include: determining a gear (or a value range) where a leakage current value indicated by the leakage current signal is located; and further outputs a corresponding display control signal according to the gear. Further, determining the gear in which the leakage current value indicated by the leakage current signal is located may include: comparing a leakage current value indicated by the leakage current signal with a plurality of predetermined thresholds; and according to the comparison result, the gear (or the value range) where the leakage current value indicated by the leakage current signal is located is judged. Further, in some embodiments, outputting the corresponding display control signal based on the gear (or the value range) where the leakage current value is located may further include: and encoding gear information of a leakage current signal (or the leakage current signal after analog-to-digital conversion) of the leakage sensor to output an encoded display control signal.
In particular, in embodiments where the controller 2 outputs an encoded display control signal, the leakage current monitoring device 10 of the present disclosure may further include a decoder 7, which decoder 7 may be coupled between the controller and the display device to decode the encoded display control signal and transmit the decoded display control signal to the display device. It will be readily appreciated that the savings in output ports of the controller 2 may be facilitated by the manner of encoding and decoding described above.
The display device 3 may be coupled to the controller 2, and is designed to display or indicate different leakage current information based on the different display control signals. In some embodiments, the display device 3 may be located on the same circuit board as the controller 2. In still other embodiments, the controller 2 may be connected to the display device 3 via a cable.
By way of example only, fig. 2 shows an exemplary arrangement of a display device 3 comprising a plurality of sets of light emitting diodes according to an exemplary embodiment of the present disclosure.
As shown in fig. 2, the display device 3 may include a plurality of sets of light emitting diodes 31, 32, 33, 34, 35, 36, each set of light emitting diodes may include at least one light emitting diode (specifically, may include only one light emitting diode), each set of light emitting diodes having a corresponding control switch 311, 321, 331, 341, 351, 361, which may be configured to be turned on or off based on the display control signal so as to light on or light off the light emitting diodes of the corresponding set, wherein a combination of the lighting on or the lighting off of the plurality of sets of light emitting diodes is adapted to indicate the different leakage current information. It will be readily appreciated that the choice of the number of sets of light emitting diodes 31, 32, 33, 34, 35, 36 described above may depend on the number of gear steps for which leakage current is intended to be monitored.
For example, the illumination of only the first group of light emitting diodes 31 of the plurality of groups of light emitting diodes may be used to indicate that the leakage current is in the first gear, the illumination of only the second group of light emitting diodes 32 may be used to indicate that the leakage current is in the second gear, and the illumination of only the third group of light emitting diodes 33 may be used to indicate that the leakage current is in the third gear, etc., wherein the ranges of values of the leakage current represented by the first gear, the second gear, the third gear, etc. sequentially increase. It will be readily understood that other combinations of illumination or extinction of multiple sets of leds may also be used to indicate different leakage current information, and such combinations are within the scope of the present disclosure. For example, it is even possible to use the extinction of only the first group of light emitting diodes 31 or the extinction of only the second group of light emitting diodes 32 in the plurality of groups of light emitting diodes to indicate that the leakage current is in the first gear position or the second gear position, or the like. It is also easy to understand that, according to the lighting condition of the multiple groups of light emitting diodes, the maintenance personnel can know the gear or grading condition of the leakage current of the equipment which is intended to be protected even if the equipment does not perform the leakage protection operation, so as to prevent the equipment in advance.
In some embodiments, the plurality of sets of leds 31, 32, 33, 34, 35, 36 may also have different light emitting colors, and the different light emitting colors may be used to indicate different leakage current information. For example, the first, second, third and fourth groups of leds 31, 32, 33, 34 are all green light emitting diodes, the fifth group of leds 35 is orange light emitting diodes, and the sixth group of leds 36 is red light emitting diodes, wherein green lighting of the first, second, third and fourth groups of leds 31, 32, 33, 34 may be used to indicate leakage current in the first, second, third and fourth gears, respectively, orange lighting of the fifth group of leds 35 may be used to indicate leakage current in the fifth gear, and red lighting of the sixth group of leds 36 may be used to indicate leakage current in the sixth gear, wherein the leakage current value ranges represented by the first, second, third, fourth, fifth and sixth gears, etc. are sequentially increased. In particular, the sixth gear may, for example, indicate that the value of the leakage current is close to a threshold value at which leakage protection needs to be performed. It is easy to understand that, according to the lighting colors of the multiple groups of light emitting diodes, the maintenance personnel can know the leakage current condition of the equipment which is intended to be protected even if the equipment does not perform the leakage protection operation, so as to prevent in advance correspondingly.
In some embodiments, as shown in fig. 2, each of the plurality of sets of leds 31, 32, 33, 34, 35, 36 may be connected in series with a corresponding control switch 311, 321, 331, 341, 351, 361. Further, the plurality of sets of light emitting diodes 31, 32, 33, 34, 35, 36 may be connected in parallel with each other. However, the arrangement of the multiple sets of light emitting diodes is not limited, and in other embodiments, it is also possible that each set of light emitting diodes in the multiple sets of light emitting diodes is connected in parallel with the corresponding control switch, in which case each set of light emitting diodes may be bypassed when the corresponding control switch is turned on and turned on when the corresponding control switch is turned off, so as to achieve the control of turning off or turning on each set of light emitting diodes.
For example only, the control switch may be a transistor such as a Field Effect Transistor (FET) and a Bipolar Junction Transistor (BJT).
Further, in some embodiments, the output of the controller 2 may be directly connected to the control switches corresponding to each group of leds, so as to directly control the switches. However, as previously mentioned, this may undesirably occupy too many output ports of the controller.
Thus, in further embodiments, the output of the controller 2 may also be connected to the control switch (e.g., the gate of a transistor) corresponding to each group of light emitting diodes via the decoder 7.
By way of example only, fig. 2 also shows a schematic arrangement of groups of light emitting diodes connected to the display device 3 using a decoder 7. As shown in fig. 2, the decoder 7 may include a plurality of input ports (e.g., S0, S1, and S2) which may be connected to a plurality of digital output ports of the controller 2, and a plurality of output ports (e.g., Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7) which may be respectively connected to control switches (e.g., gates of transistors) corresponding to the plurality of sets of light emitting diodes. It can be understood that, in the above-described combination of the controller and the decoder, the control of the control switches corresponding to a large number of groups of light emitting diodes can be realized in a cost-effective manner, so as to realize the indication of a plurality of different leakage current information.
The display device of the present disclosure is described above mainly by taking a light emitting diode as an example. However, it should be understood that the display device of the present disclosure is not limited to the use of light emitting diodes, and it is also possible to use a liquid crystal display screen (LCD) as the display device. At this time, different leakage current information may be displayed based on the different display control signals through the display screen. It will also be appreciated that the solution using light emitting diodes is clearly more cost effective than the solution using a liquid crystal display screen.
The specific structure of the leakage current monitoring device according to the embodiments of the present disclosure has been described above in detail. The leakage current monitoring device can realize grading display or early warning of leakage current, so that a user can comprehensively and timely master the leakage condition of a circuit, and hidden dangers can be timely checked; and upon detecting that the leakage current value reaches a predetermined value, the controller may instruct a leakage protection operation, such as an open circuit, to be performed. Further, the leakage current monitoring device of the present disclosure may also be part of various types of electrical equipment.
While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims.
In the claims, the word "comprising" does not exclude other elements, and the indefinite article "a" or "an" does not exclude a plurality. A single element or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain features are recited in mutually different embodiments or in dependent claims does not indicate that a combination of these features cannot be used to advantage. The scope of protection of the present application covers any possible combination of features recited in the various embodiments or in the dependent claims, without departing from the spirit and scope of the application.
Furthermore, any reference signs in the claims shall not be construed as limiting the scope of the invention.
Claims (10)
1. A leakage current monitoring device (10), comprising:
a leakage sensor (1) for detecting a leakage current and generating a leakage current signal;
a controller (2) coupled to the leakage sensor (1) and configured to output different display control signals based on different leakage current values indicated by the leakage current signal; and
a display device (3) coupled to the controller (2) and configured to display or indicate different leakage current information based on the different display control signals.
2. A leakage current monitoring device (10) according to claim 1, wherein the display device (3) comprises a plurality of groups of light emitting diodes, each group of light emitting diodes having a corresponding control switch configured to be switched on or off based on the display control signal so as to light on or off a corresponding group of light emitting diodes, the combination of the lit-on or extinguished states of the plurality of groups of light emitting diodes being adapted to indicate the different leakage current information.
3. Residual current monitoring device (10) according to claim 2, characterized in that each group of light emitting diodes is connected in series or in parallel with a corresponding control switch.
4. Residual current monitoring device (10) according to any of claims 2-3, characterized in that said display control signal is a display control signal encoded by said controller (2).
5. The residual current monitoring device (10) according to claim 4, further comprising:
a decoder (7) coupled between the controller (2) and the display device (3) to decode the encoded display control signal and transmit the decoded display control signal to the display device (3).
6. The leakage current monitoring device (10) according to claim 5, wherein the control switch is a transistor, the gate of which is connected to the output of the decoder (7).
7. Residual current monitoring device (10) according to any of claims 2-3 and 5-6, characterized in that different sets of said light emitting diodes are configured to emit light of different colors.
8. The residual current monitoring device (10) according to claim 1, wherein the display device (3) is further configured to: displaying or indicating the different leakage current information using different colors based on the different display control signals.
9. Residual current monitoring device (10) according to claim 1 or 8, characterized in that said display device (3) comprises a liquid crystal display.
10. An electrical apparatus, characterized in that it comprises a residual current monitoring device (10) according to any one of claims 1-9.
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| CN202222533141.2U CN218848304U (en) | 2022-09-23 | 2022-09-23 | Leakage current monitoring device and related electrical equipment |
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| CN202222533141.2U CN218848304U (en) | 2022-09-23 | 2022-09-23 | Leakage current monitoring device and related electrical equipment |
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