Impedance detection circuit, impedance detection system and impedance detection equipment

Abstract

The utility model discloses an impedance detection circuit, an impedance detection system and impedance detection equipment, and the impedance detection circuit comprises a resistance circuit, a voltage detection circuit and a control circuit. A first end of the resistance circuit is used for connecting a power supply interface, and a second end of the resistance circuit is used for grounding through an equipment shell; a first end of the voltage detection circuit is connected with a connection node between the resistance circuit and the equipment shell, and a second end of the voltage detection circuit is used for outputting a voltage detection signal; and the control circuit is connected with the second end of the voltage detection circuit and is used for determining the impedance of the equipment shell according to the voltage detection signal. According to the technical scheme, the impedance of the equipment shell can be automatically detected in real time, the safety of electrical equipment is improved, and the manpower maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to impedance detection technical field especially relates to a kind of impedance detection circuit, impedance detection system and impedance detection equipment. BACKGROUND

[0002] In today's industrial production environment, the application of various electrical equipment is increasingly widespread, and the importance of safe operation of electrical equipment is self-evident. In order to ensure the safety of electrical equipment and personnel, the grounding problem of electrical equipment shell has become a crucial link. The existing electrical equipment shell grounding technology can protect electrical equipment and personnel from electric shock and fault current to some extent, but still has certain deficiencies.

[0003] At present, the grounding of electrical equipment shell in most factories still relies on manual measurement and maintenance, which has the problems of risk of electric shock, long maintenance time and difficult fault location. Therefore, how to monitor the grounding state of the equipment shell in real time to improve the safety of electrical equipment and reduce the cost of human maintenance has become a technical problem to be solved. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a kind of impedance detection circuit, impedance detection system and impedance detection equipment to solve the problem of poor safety of the grounding detection of the shell of present electrical equipment.

[0005] An impedance detection circuit, comprising a resistance circuit, a voltage detection circuit and a control circuit;

[0006] The first end of the resistance circuit is used to connect the power supply interface, and the second end of the resistance circuit is used to ground through the equipment shell.

[0007] The first end of the voltage detection circuit is connected to the connection node between the resistance circuit and the equipment shell, and the second end of the voltage detection circuit is used to output a voltage detection signal.

[0008] The control circuit is connected to the second end of the voltage detection circuit, and is used to determine the impedance of the equipment shell according to the voltage detection signal.

[0009] Further, the resistance value of the resistance circuit ranges from 5 ohms to 105 ohms.

[0010] Further, the voltage detection circuit comprises an ADC conversion circuit.

[0011] An impedance detection system comprising a power supply interface and the above-mentioned impedance detection circuit;

[0012] The power supply interface is connected to the first end of the resistance circuit.

[0013] Further, the power supply interface is connected with the first end of the resistance circuit through a first voltage conversion circuit.

[0014] Further, the power supply interface is connected with the first end of the resistance circuit through a first voltage conversion circuit.

[0015] Further, the impedance detection system further comprises a buzzer connected with the control circuit.

[0016] Further, the impedance detection system further comprises an alarm indicator lamp connected with the control circuit.

[0017] Further, the impedance detection system further comprises a first interface connected with the control circuit, and the first interface is used for connecting a manufacturing execution system.

[0018] An impedance detection device comprises the above impedance detection system.

[0019] The impedance detection circuit, the impedance detection system and the impedance detection device, the impedance detection circuit comprises a resistance circuit, a voltage detection circuit and a control circuit, the first end of the resistance circuit is used for connecting a power supply interface, the second end of the resistance circuit is used for grounding through a device shell, the first end of the voltage detection circuit is connected with a connection node between the resistance circuit and the device shell, the second end of the voltage detection circuit is used for outputting a voltage detection signal, and the control circuit is connected with the second end of the voltage detection circuit and is used for determining the impedance of the device shell according to the voltage detection signal, automatically detecting the impedance of the device shell in real time, improving the safety of electrical equipment and reducing the labor maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0021] Figure 1 is a schematic view of the impedance detection system 1 in an embodiment of the present application.

[0022] In the figure: 1, impedance detection system; 10, impedance detection circuit; 11, resistance circuit; 12, voltage detection circuit; 13, control circuit; 14, power supply interface; 15, first voltage conversion circuit; 16, second voltage conversion circuit; 17, buzzer; 18, alarm indicator lamp; 19, first interface; 2, device shell; 3, manufacturing execution system. DETAILED DESCRIPTION

[0023] Clearly, the described embodiments are only some, but not all implementations of this application. Based on the embodiments of the present application described above, those skilled in the art can obtain all other embodiments within the scope of the present application without any inventive effort, and these embodiments all belong to the scope of the present application.

[0024] It is to be understood that the application can assume various alternative forms of embodiment, and it is not to be limited to the embodiments set forth and described herein. Rather, the instant disclosure is intended to cover all adaptations, modifications, and equivalents. In addition, unless expressly stated otherwise, the description of an embodiment should not be construed as indicating that the features, items or components relating thereto are essential or indispensable. In the drawings, the size and relative sizes of layers and regions can be exaggerated for clarity.

[0025] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will also be understood that, although the terms first, second, third, etc. can be used herein 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 since such terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section.

[0026] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. 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 one or more of the associated listed items.

[0028] For a thorough understanding of the present application, reference will be made to the following detailed description, in conjunction with the accompanying drawings, in which:

[0029] The present embodiment provides an impedance detection circuit 10, as shown in the figure, comprising a resistance circuit 11, a voltage detection circuit 12 and a control circuit 13; the first end of the resistance circuit 11 is used for connecting a power supply interface 14, and the second end of the resistance circuit 11 is used for grounding through a device shell 2; the first end of the voltage detection circuit 12 is connected with a connection node between the resistance circuit 11 and the device shell 2, and the second end of the voltage detection circuit 12 is used for outputting a voltage detection signal; the control circuit 13 is connected with the second end of the voltage detection circuit 12, and is used for determining the impedance of the device shell 2 according to the voltage detection signal. Figure 1

[0030] The power supply interface 14 is used for receiving a power supply voltage. The device shell 2 refers to the ground shell of an electrical device.

[0031] As an example, the impedance detection circuit 10 is applied to an impedance detection system 1. The impedance detection system 1 comprises the power supply interface 14 and the impedance detection circuit 10. The power supply interface 14 is used for connecting a power supply device. The power supply device comprises a charger or an energy storage device, etc.

[0032] ​As an example, when the impedance detection circuit 10 works, an electric loop is formed between the power supply interface 14, the resistance circuit 11, the device shell 2 and the ground, and the voltage detection circuit 12 can collect the voltage detection signal in the electric loop in real time. According to the voltage detection signal and the preset calculation strategy, the control circuit 13 can determine the impedance of the device shell 2, and the user can perform the electrical device shell 2 grounding detection through the impedance of the device shell 2. As an example, the electrical device shell 2 grounding detection includes judging whether the impedance of the device shell 2 meets the national standard shell grounding impedance requirement, i.e. the shell grounding impedance requirement is below 1 ohm, and judging whether the device shell 2 is normally grounded, for example, the shell grounding impedance is greater than 10 ohms, and then the device shell 2 is judged to be abnormally grounded.

[0033] As an example, the preset calculation strategy is a calculation strategy set based on Ohm's law. As an example, the control circuit 13 can determine the impedance of the device shell 2 according to the power supply voltage of the power supply interface 14, the resistance value of the resistance circuit 11 and the detection voltage corresponding to the voltage detection signal, see the following formula:

[0034] ; wherein, is the impedance of the device shell 2, is the power supply voltage, is the resistance value of the resistance circuit 11, is the detection voltage corresponding to the voltage detection signal.

[0035] In this embodiment, the impedance detection circuit 10 includes the resistance circuit 11, the voltage detection circuit 12 and the control circuit 13; the first end of the resistance circuit 11 is used to connect the power supply interface 14, the second end of the resistance circuit 11 is used to ground through the device shell 2; the first end of the voltage detection circuit 12 is connected to the connection node between the resistance circuit 11 and the device shell 2, and the second end of the voltage detection circuit 12 is used to output the voltage detection signal; the control circuit 13 is connected to the second end of the voltage detection circuit 12, and is used to determine the impedance of the device shell 2 according to the voltage detection signal, to automatically and real-timely detect the impedance of the device shell 2, to improve the safety of the electrical device and to reduce the labor maintenance cost.

[0036] In an embodiment, the resistance value of the resistance circuit 11 ranges from 5 ohms to 105 ohms.

[0037] In this embodiment, the resistance value of the resistance circuit 11 ranges from 5 ohms to 105 ohms, which can balance the whole machine power consumption and the impedance detection accuracy of the device shell 2.

[0038] As an example, the closer the resistance value of the resistance circuit 11 is to 10 ohms, the higher the impedance detection accuracy of the device shell 2 is, but there is a certain power consumption.

[0039] As preferred, the resistance circuit 11 has a resistance of 100 ohms, which can achieve a measurement accuracy of 0.1 ohm and ensure low power consumption of the whole device.

[0040] In an embodiment, the voltage detection circuit 12 comprises an ADC conversion circuit. In this embodiment, the voltage detection signal is acquired by the ADC conversion circuit, which can ensure the accuracy and stability of the signal.

[0041] As an example, the control circuit 13 comprises an MCU (Microcontroller Unit, MCU for short).

[0042] This embodiment provides an impedance detection system 1, which comprises a power supply interface 14 and the above-mentioned impedance detection circuit 10, as shown in the figure. Figure 1 The power supply interface 14 is connected to the first end of the resistance circuit 11.

[0043] In this embodiment, the power supply interface 14 forms an electric loop with the resistance circuit 11, the device shell 2 and the ground. The voltage detection circuit 12 can acquire the voltage detection signal in the electric loop in real time. The control circuit 13 can determine the impedance of the device shell 2 according to the voltage detection signal and a preset calculation strategy. The user can perform the ground detection of the electrical device shell 2 through the impedance of the device shell 2, which improves the safety of the electrical device and reduces the labor maintenance cost.

[0044] In an embodiment, the power supply interface 14 is connected to the first end of the resistance circuit 11 through a first voltage conversion circuit 15.

[0045] As an example, the first voltage conversion circuit 15 comprises a first DC / DC conversion circuit. In this embodiment, the first DC / DC conversion circuit is configured according to the actual demand by connecting the power supply interface 14 to the first end of the resistance circuit 11 through the first voltage conversion circuit 15, which converts the power supply voltage and adjusts the size of the power supply voltage.

[0046] In an embodiment, the power supply interface 14 is connected to the control circuit 13 through a second voltage conversion circuit 16.

[0047] As an example, the first voltage conversion circuit 15 comprises a second DC / DC conversion circuit. In this embodiment, the second DC / DC conversion circuit converts the power supply voltage into the working voltage of the MCU in the control circuit 13, so as to ensure the normal work of the MCU.

[0048] In an embodiment, the impedance detection system 1 further comprises a buzzer 17 connected to the control circuit 13. In this embodiment, when the control circuit 13 detects the abnormal impedance of the device shell 2, the buzzer 17 can alarm, which facilitates the timely discovery of the abnormal impedance of the device shell 2.

[0049] In an embodiment, the impedance detection system 1 further comprises an alarm indicator 18 connected to the control circuit 13.

[0050] In the embodiment, when the control circuit 13 detects the abnormal impedance of the device shell 2, the alarm indicator 18 can be flickered to alarm, so as to facilitate the timing discovery of the abnormal impedance of the device shell 2.

[0051] It should be noted that the buzzer 17 and the alarm indicator 18 can alarm separately or simultaneously, so as to facilitate the offline alarm and timely remind the on-site personnel when the impedance of the device shell 2 is abnormal.

[0052] In an embodiment, the impedance detection system 1 further comprises a first interface 19 connected to the control circuit 13, and the first interface 19 is used to connect the manufacturing execution system 3.

[0053] Preferably, the first interface 19 is an Ethernet port. The manufacturing execution system 3 (MES) is a management information system for the workshop layer of a manufacturing enterprise, which provides real-time information such as plan execution, production scheduling, quality control, device management, process management, and performance analysis for operators and managers.

[0054] In the embodiment, the control circuit 13 is connected to the manufacturing execution system 3 through the first interface 19, so as to facilitate the user to monitor and manage the impedance detection system 1 in real time through the manufacturing execution system 3, save the labor cost, and improve the monitoring accuracy.

[0055] Further, the impedance detection system 1 further comprises an input device, such as a button, connected to the control circuit 13, which is used for the user to interact with the MCU in the control circuit 13.

[0056] Further, the impedance detection system 1 further comprises a display device connected to the control circuit 13, which is used to display the impedance of the device shell 2.

[0057] The embodiment provides an impedance detection device comprising the above impedance detection system 1.

[0058] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An impedance detection circuit, characterized by, The impedance detection system comprises a resistance circuit, a voltage detection circuit and a control circuit. A first end of the resistance circuit is connected to a power supply interface, and a second end of the resistance circuit is grounded through a device shell. A first end of the voltage detection circuit is connected to a connection node between the resistance circuit and the device shell, and a second end of the voltage detection circuit is configured to output a voltage detection signal. The control circuit is connected to the second end of the voltage detection circuit, and is configured to determine impedance of the device shell according to the voltage detection signal.

2. The impedance detection circuit of claim 1, wherein, The resistance circuit has a resistance range of 5 ohms to 105 ohms.

3. The impedance detection circuit of claim 1, wherein, The voltage detection circuit comprises an ADC conversion circuit.

4. An impedance detection system characterized by, The impedance detection system comprises the power supply interface and the impedance detection circuit according to any one of claims 1 to 3. The power supply interface is connected to the first end of the resistance circuit.

5. The impedance detection system of claim 4, wherein, The power supply interface is connected to the first end of the resistance circuit through a first voltage conversion circuit.

6. The impedance detection system of claim 4, wherein, The power supply interface is connected to the control circuit through a second voltage conversion circuit.

7. The impedance detection system of claim 4, wherein, The impedance detection system further comprises a buzzer connected to the control circuit.

8. The impedance detection system of claim 4, wherein, The impedance detection system further comprises an alarm indicator connected to the control circuit.

9. The impedance detection system of claim 4, wherein, The impedance detection system further comprises a first interface connected to the control circuit, and the first interface is configured to be connected to a manufacturing execution system.

10. An impedance detection device, characterized by The impedance detection system comprises the impedance detection system according to any one of claims 4 to 9.

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