CN215449549U

CN215449549U - Real-time grounding detection circuit

Info

Publication number: CN215449549U
Application number: CN202122071866.XU
Authority: CN
Inventors: 周海波; 周军保
Original assignee: Zhou Junbao
Current assignee: Zhou Junbao
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-01-07
Anticipated expiration: 2031-08-31

Abstract

The utility model relates to a real-time grounding detection circuit which comprises a safety gauge capacitor, an optical coupler, a protection diode and a pull-up resistor, wherein the safety gauge capacitor is connected with 220v alternating current and the optical coupler, the protection diode is connected with the optical coupler and the ground, the pull-up resistor is connected with the optical coupler and low-voltage, the output point of the optical coupler is connected to a level detection circuit, and the grounding condition of an electric appliance can be detected in real time for all electric appliances with grounding detection requirements by combining hardware level detection and a human-computer interface and is displayed through the human-computer interface or the use of the electric appliance is directly forbidden so as to avoid the damage of the electric appliance caused by poor grounding.

Description

Real-time grounding detection circuit

Technical Field

The utility model belongs to the technical field of grounding, and particularly relates to a real-time grounding detection circuit.

Background

For electronic maintenance and production and debugging tools, such as soldering irons, oscilloscopes and the like, such devices are in direct contact with electronic components, the tools are usually powered by alternating current, so that the tools can carry static electricity or even weak alternating current leakage, the electronic components, particularly semiconductor components, contacted by the tools are sensitive to static electricity, and if the tools are in poor grounding, the components can be damaged or destroyed in the using process of the tools, so that the maintenance, production and debugging costs are greatly increased. And current many ground connection detection techniques all go on when needing the outage, and it is still troublesome to use, leads to many times that the user does not detect the ground connection condition and just uses this kind of instrument, or the ground connection condition worsens after using a period of time and leads to the poor ground connection and arouse the problem. Therefore, it is necessary to provide a new real-time ground detection circuit to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving the above problems and providing a real-time ground fault detection circuit. In order to overcome the defects of the prior art, the real-time grounding detection circuit can solve the problem that grounding is detected in real time in the use process of a tool, and when poor grounding is detected, a user can be reminded through a human-computer interface or equipment is directly forbidden to use, so that damage to the equipment caused by poor grounding is avoided.

The utility model realizes the purpose through the following technical scheme:

a real-time grounding detection circuit comprises a safety capacitor C3, an optocoupler U1, a protection diode D3, a pull-up resistor R1 and a detection point D;

the safety capacitor C3 is connected with 220v alternating current and the optocoupler U1, and a safe micro-current loop is provided for the optocoupler U1;

the protection diode D3 is connected with the optocoupler U1 and safely and is used for protecting the optocoupler U1 from spike interference damage;

the pull-up resistor R1 is connected with the optocoupler U1 and low-voltage, so that the optocoupler is kept at a high level when not grounded;

and the detection point D is connected to the level detection circuit.

As a further optimization scheme of the utility model, the detection point D is connected with a human-computer interface circuit for level detection and displaying a grounding detection result.

As a further optimization scheme of the utility model, the detection point D is connected with a human-computer interface circuit to carry out level detection and prohibit the equipment from working.

As a further optimization scheme of the utility model, the detection point D carries out grounding state indication through an indicator lamp.

The utility model has the beneficial effects that:

the utility model can detect the grounding condition of the electric appliance in real time for all electric appliances with grounding detection requirements by combining a novel circuit with hardware level detection and a human-computer interface, and display the grounding condition through the human-computer interface or directly forbid the use of equipment so as to avoid the damage of the equipment caused by poor grounding.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

Example 1

As shown in fig. 1, the real-time ground detection circuit includes a safety capacitor C3, a protection diode D3, an optocoupler U1, a pull-up resistor R1, and a detection point D, wherein one side of the safety capacitor C3 is electrically connected to a 220V alternating current, and the other side of the safety capacitor C3 is connected to a light emitting diode pin of the optocoupler U1, so as to form a very small alternating current loop. The safety capacitor C3 adopts a small capacitance value, the circuit is safe in use due to the characteristics of the safety capacitor C3, in addition, the equivalent resistance of the safety capacitor C3 is extremely large, and the circuit cannot additionally increase the power consumption of equipment. The protection diode D3 is connected with the two feet of the light emitting diode of the optocoupler U1 in the reverse direction and is used for protecting the light emitting diode inside the optocoupler U1 so as to prevent the optocoupler U1 from being damaged due to overhigh voltage. And the ground feet of the light emitting diode of the optocoupler U1 are connected with the ground, and form a weak loop together with the safety capacitor C3. And an emitter of an output end of the optical coupler U1 is connected with a low-voltage detection circuit ground, and a collector of the optical coupler U1 is connected with a pull-up resistor R1. The detection point D is a level output point of grounding detection, can be connected to a part of a circuit of a human-computer interface of equipment for displaying, and can also directly display the grounding condition through an indicator lamp. When the equipment is well grounded, a loop of a light emitting diode of the optocoupler U1 has weak current, and a detection point D is periodically pulled down; when the equipment is in poor grounding, the light-emitting diode of the optocoupler U1 cannot form a loop, the detection point D cannot be pulled down, and the detection point D is stored as a high level.

The real-time grounding detection circuit is combined with a human-computer interface, so that the grounding condition of equipment can be displayed in real time, and a user can be reminded in real time when poor grounding is found, even the equipment is shut down, so that damage caused by poor grounding is avoided.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. A real-time ground detection circuit, characterized by: the protection circuit comprises a safety capacitor C3, an optocoupler U1, a protection diode D3, a pull-up resistor R1 and a detection point D;

the pull-up resistor R1 is connected with the optocoupler U1 and low-voltage, so that the optocoupler U1 is kept at a high level when not grounded;

and the detection point D is connected to the level detection circuit.

2. The real-time ground detection circuit of claim 1, wherein: and the detection point D is connected with a human-computer interface circuit for level detection and displaying a grounding detection result.

3. The real-time ground detection circuit of claim 1, wherein: and the detection point D is connected with a human-computer interface circuit to carry out level detection and forbid the equipment from working.

4. The real-time ground detection circuit of claim 1, wherein: and the detection point D carries out grounding state indication through an indicator lamp.