Ground fault alarm device

Abstract

The utility model discloses a grounding fault alarm device which comprises a detection module, a first voltage dividing module, a second voltage dividing module and a grounding output module. The first ends of the first voltage-dividing module and the second voltage-dividing module are electrically connected with a live wire and a zero wire of an alternating current power supply respectively, and the second ends are electrically connected with a detection pin of the detection module; the grounding output module is electrically connected with a grounding output pin of the power supply module of the detection module; the first voltage dividing module, the second voltage dividing module, the detection module and the grounding output module form a loop; the detection module is used for detecting power voltage frequency of the loop. Voltage division is carried out on alternating current, the loop is formed by the grounding output pin of the power supply module of the detection module and the grounding output module, and whether grounding of equipment is normal or not is determined by detecting the alternating current voltage frequency of the loop through the detection module, so that the problem that the grounding state of existing electrical equipment cannot be detected in time is solved; and the potential safety hazard caused by grounding falling is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of grounding alarm, in particular to a grounding fault alarm device. Background Art

[0002] Currently, the vast majority of electronic and electrical equipment requires grounding during installation and use. Proper grounding is essential for the safe operation of these devices and is a key method for eliminating static electricity. Therefore, grounding is essential for all equipment that presents static electricity risks. The quality of the grounding is directly related to the effectiveness of static electricity elimination. Poor grounding prevents static electricity elimination, leading to a series of static electricity incidents.

[0003] In addition to the mains ground, users often have other grounds in their homes, such as those for cable TV and wired networks. For example, cable digital TV systems are complex, including numerous grounding points, such as internal grounding for the device, signal transmission grounding, and mains grounding. Often, after installation, the device is grounded immediately, but its grounding status (either properly grounded or ungrounded) cannot be determined. If the ground wire becomes disconnected or continues to operate without being connected, the device can leak electricity, potentially damaging the product and potentially posing a health hazard. Summary of the Invention

[0004] The grounding status of many existing electrical equipment cannot be detected in a timely manner, posing a safety hazard.

[0005] To address the above problems, a ground fault alarm device is proposed. By dividing the AC voltage and forming a loop with the ground output module through the ground output pin of the power supply module of the detection module, the detection module detects the AC voltage frequency of the loop to determine whether the grounding of the equipment is normal. This solves the problem that the grounding status of existing electrical equipment cannot be detected in time, and eliminates the safety hazards caused by grounding failure.

[0006] A ground fault alarm device, comprising:

[0007] Detection module;

[0008] A first voltage divider module;

[0009] A second voltage divider module;

[0010] Ground output module;

[0011] The first ends of the first voltage divider module and the second voltage divider module are electrically connected to the live wire and the neutral wire of the AC power supply respectively, and the second ends are electrically connected to the detection pin of the detection module;

[0012] The ground output module is electrically connected to the ground output pin of the power supply module of the detection module;

[0013] The first voltage divider module, the second voltage divider module, the detection module, and the ground output module form a loop;

[0014] The detection module is used to detect the AC power supply voltage frequency of the loop.

[0015] In conjunction with the ground fault alarm device of the present invention, in a first possible implementation manner, the ground fault alarm device further includes:

[0016] Voltage regulator module;

[0017] The second ends of the first voltage dividing module and the second voltage dividing module are electrically connected to the detection pin of the detection module through the voltage stabilizing module.

[0018] In combination with the first possible implementation manner of the present utility model, in a second possible implementation manner, the ground fault alarm device further includes:

[0019] Alarm module;

[0020] The alarm module is electrically connected to the detection module and is configured to output an alarm signal according to a control signal from the detection module.

[0021] In combination with the second possible implementation manner of the present invention, in a third possible implementation manner, the detection module includes a single-chip microcomputer chip; the detection pin is led out from the single-chip microcomputer chip, and the ground output pin is led out from the power supply module.

[0022] In combination with the third possible implementation manner of the present utility model, in a fourth possible implementation manner, the detection module further includes an alarm control pin;

[0023] The alarm control pin is led out from the single chip microcomputer chip;

[0024] The alarm module includes a power amplifier circuit;

[0025] The power amplifier circuit is electrically connected to the alarm control pin;

[0026] The single chip microcomputer chip is used to drive the power amplifier circuit to operate and output an alarm sound through the alarm control pin when detecting that the input frequency of the AC power supply is 0.

[0027] In combination with the first possible implementation method of the present utility model, in a fifth possible implementation method, the first voltage divider module includes a first high-voltage resistor, a second high-voltage resistor and a third high-voltage resistor, the second voltage divider module includes a fourth high-voltage resistor, a fifth high-voltage resistor and a sixth high-voltage resistor, the first high-voltage resistor, the second high-voltage resistor and the third high-voltage resistor are connected in series in sequence to constitute the first voltage divider module, and the fourth high-voltage resistor, the fifth high-voltage resistor and the sixth high-voltage resistor are connected in series in sequence to constitute the second voltage divider module.

[0028] In combination with the fifth possible implementation manner of the present invention, in a sixth possible implementation manner, the resistance values ​​of the first high-voltage resistor, the second high-voltage resistor, the third high-voltage resistor, the fourth high-voltage resistor, the fifth high-voltage resistor and the sixth high-voltage resistor are equal and greater than or equal to 1 MΩ.

[0029] The ground fault alarm device described in the present invention divides the AC voltage and forms a loop with the ground output module through the ground output pin of the power supply module of the detection module. The detection module detects the AC voltage frequency of the loop to determine whether the grounding of the equipment is normal, thereby solving the problem that the grounding status of existing electrical equipment cannot be detected in time and eliminating the safety hazards caused by ground loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the module structure of the ground fault alarm device in the present utility model;

[0032] Figure 2 This is a schematic diagram of the circuit structure of the ground fault alarm device in the utility model;

[0033] The numbers in the accompanying drawings indicate the following parts: 100 - first voltage divider module, 200 - second voltage divider module, 300 - voltage stabilizing module, 400 - alarm module, 500 - power supply module, 600 - ground output module, 700 - detection module. DETAILED DESCRIPTION

[0034] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0039] The grounding status of many existing electrical equipment cannot be detected in a timely manner, posing a safety hazard.

[0040] In view of the above problems, a ground fault alarm device is proposed.

[0041] A ground fault alarm device, such as Figure 1 , Figure 1This is a schematic diagram of the module structure of the ground fault alarm device in the present invention; it includes a detection module 700, a first voltage divider module 100, a second voltage divider module 200, and a ground output module 600. The first ends of the first voltage divider module 100 and the second voltage divider module 200 are electrically connected to the live wire (AC-L) and neutral wire (AC-N) of the AC power supply, respectively, and the second ends are electrically connected to the detection pin of the detection module 700. The ground output module 600 is electrically connected to the ground output pin of the power supply module 500 of the detection module 700. The first voltage divider module 100, the second voltage divider module 200, the detection module 700, and the ground output module 600 form a loop. The detection module 700 is used to detect the power supply voltage frequency of the loop. By dividing the AC power and forming a loop with the ground output pin of the detection module 700 and the ground output module 600 through the ground output pin of the detection module 700, the detection module 700 uses the AC voltage frequency of the loop to determine whether the grounding of the equipment is normal, thereby solving the problem of the inability to timely detect the grounding status of existing electrical equipment and eliminating the safety hazards caused by ground loss.

[0042] The power supply module includes a power supply chip U8, which includes two AC input pins (220_IN) and a ground output pin OUT+.

[0043] In a preferred embodiment, the AC power supply can select 220V AC mains power, and the first voltage divider module 100 and the second voltage divider module 200 are respectively electrically connected to the live wire (AC-L) and the neutral wire (AC-N) of the above-mentioned 220V AC mains power, and are electrically connected to the detection pin of the detection module 700 after voltage division. Then, when the above-mentioned loop is formed, the detection module 700 can obtain the AC frequency of 50HZ of the 220V AC mains power. If the grounding output module 600 is not grounded or the grounding wire is damaged, and the above-mentioned loop is not formed, the above-mentioned AC frequency cannot be detected, and an alarm signal can be output.

[0044] In a preferred embodiment, as Figure 2 The ground fault alarm device also includes a voltage stabilization module 300. The second ends of the first and second voltage divider modules 100 and 200 are electrically connected to the detection pin of the detection module 700 via the voltage stabilization module 300. The voltage stabilization module 300 is used to filter and stabilize the power supply input to the detection module 700 chip to prevent damage to the chip due to power grid fluctuations.

[0045] The circuit structure of the voltage regulator module is as follows Figure 2 , which includes a diode D1, a resistor R8, a resistor R9, and a voltage regulator D2.

[0046] In a preferred embodiment, the ground fault alarm device further includes an alarm module 400 ; the alarm module 400 is electrically connected to the detection module 700 and is configured to output an alarm signal according to a control signal of the detection module 700 .

[0047] The alarm module 400 is controlled by the detection module 700 chip and outputs an alarm signal, which can be a prompt light or a prompt buzzer (BUZZER1), outputting an alarm light or a warning sound.

[0048] In a preferred embodiment, the detection module 700 includes a single-chip microcomputer chip U7; the detection pin is led out from the single-chip microcomputer chip U7, and the ground output pin is led out from the power supply module 500.

[0049] Furthermore, the detection module 700 also includes an alarm control pin PA1; the alarm control pin PA1 is led out from the single-chip microcomputer chip U7; the alarm module 400 includes a power amplifier circuit; the power amplifier circuit is electrically connected to the alarm control pin PA1; the single-chip microcomputer chip U7 is used to drive the power amplifier circuit to operate through the alarm control pin PA1 and output an alarm sound when it detects that the input frequency of the AC power supply is 0.

[0050] Grounding status detection steps:

[0051] 220V AC is used to generate a 50HZ frequency. The single-chip microcomputer chip U7 is connected to the 220V current. The live wire (AC-L) and the neutral wire (AC-N) are divided by a voltage divider module composed of a high-voltage resistor U and are respectively connected to the single-chip microcomputer detection pin. The ground pin of the power supply module 500 of the single-chip microcomputer chip U7 leads to GND and 220V AC to form a loop. When 220V is connected to the single-chip microcomputer, the single-chip microcomputer chip U7 or the device is not connected to GND, and the 5050HZ frequency is not generated. The single-chip microcomputer cannot detect the 50HZ signal, and the single-chip microcomputer chip U7 controls the buzzer (BUZZER1) to sound an alarm.

[0052] Specifically, such as Figure 2 , Figure 2 This is a schematic diagram of the circuit structure of the ground fault alarm device in the present invention; the first voltage divider module 100 includes a first high-voltage resistor U1, a second high-voltage resistor U2 and a third high-voltage resistor U3, and the second voltage divider module 200 includes a fourth high-voltage resistor U4, a fifth high-voltage resistor U5 and a sixth high-voltage resistor U6. The first high-voltage resistor U1, the second high-voltage resistor U2 and the third high-voltage resistor U3 are connected in series in sequence to form the first voltage divider module 100, and the fourth high-voltage resistor U4, the fifth high-voltage resistor U5 and the sixth high-voltage resistor U6 are connected in series in sequence to form the second voltage divider module 200.

[0053] Preferably, the resistance values ​​of the first high-voltage resistor U1 , the second high-voltage resistor U2 , the third high-voltage resistor U3 , the fourth high-voltage resistor U4 , the fifth high-voltage resistor U5 and the sixth high-voltage resistor U6 are equal and greater than or equal to 1 MΩ.

[0054] The ground fault alarm device described in the present invention is implemented by dividing the AC voltage and forming a loop with the ground output pin of the power supply module 500 of the detection module 700 and the ground output module 600. The detection module 700 is used to detect the AC voltage frequency of the loop to determine whether the grounding of the equipment is normal, thereby solving the problem that the grounding status of existing electrical equipment cannot be detected in time and eliminating the safety hazards caused by grounding loss.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A ground fault alarm device, characterized in that: include: Detection module; A first voltage divider module; A second voltage divider module; Ground output module; The first ends of the first voltage divider module and the second voltage divider module are electrically connected to the live wire and the neutral wire of the AC power supply respectively, and the second ends are electrically connected to the detection pin of the detection module; The ground output module is electrically connected to the ground output pin of the power supply module of the detection module; The first voltage divider module, the second voltage divider module, the detection module, and the ground output module form a loop; The detection module is used to detect the AC power supply voltage frequency of the loop.

2. The ground fault alarm device according to claim 1, characterized in that: The ground fault alarm device further includes: Voltage regulator module; The second ends of the first voltage dividing module and the second voltage dividing module are electrically connected to the detection pin of the detection module through the voltage stabilizing module.

3. The ground fault alarm device according to claim 2, characterized in that: The ground fault alarm device further includes: Alarm module; The alarm module is electrically connected to the detection module and is configured to output an alarm signal according to a control signal from the detection module.

4. The ground fault alarm device according to claim 3, characterized in that: The detection module includes a single-chip microcomputer chip; the detection pin is led out from the single-chip microcomputer chip, and the ground output pin is led out from the power supply module.

5. The ground fault alarm device according to claim 4, characterized in that: The detection module also includes an alarm control pin; The alarm control pin is led out from the single chip microcomputer chip; The alarm module includes a power amplifier circuit; The power amplifier circuit is electrically connected to the alarm control pin; The single chip microcomputer chip is used to drive the power amplifier circuit to operate and output an alarm sound through the alarm control pin when detecting that the input frequency of the AC power supply is 0.

6. The ground fault alarm device according to claim 1, characterized in that: The first voltage divider module includes a first high-voltage resistor, a second high-voltage resistor and a third high-voltage resistor, and the second voltage divider module includes a fourth high-voltage resistor, a fifth high-voltage resistor and a sixth high-voltage resistor. The first high-voltage resistor, the second high-voltage resistor and the third high-voltage resistor are connected in series in sequence to constitute the first voltage divider module, and the fourth high-voltage resistor, the fifth high-voltage resistor and the sixth high-voltage resistor are connected in series in sequence to constitute the second voltage divider module.

7. The ground fault alarm device according to claim 6, characterized in that: The resistance values ​​of the first high-voltage resistor, the second high-voltage resistor, the third high-voltage resistor, the fourth high-voltage resistor, the fifth high-voltage resistor, and the sixth high-voltage resistor are equal and greater than or equal to 1 MΩ.

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