CN221746262U - Real-time grounding detection circuit - Google Patents
Real-time grounding detection circuit Download PDFInfo
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- CN221746262U CN221746262U CN202420057567.1U CN202420057567U CN221746262U CN 221746262 U CN221746262 U CN 221746262U CN 202420057567 U CN202420057567 U CN 202420057567U CN 221746262 U CN221746262 U CN 221746262U
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 abstract description 12
- 238000005070 sampling Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000011179 visual inspection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The utility model discloses a real-time grounding detection circuit, which is a circuit capable of sampling electronic signals in real time, and comprises: relay, pull-up circuit, IO module. The method is mainly applied to the electronic equipment, and the grounding condition of each unit in the preparation stage and the whole operation process of the electronic equipment is checked in real time, so that a user can know the real-time working state of each unit of the electronic equipment according to the detection result. The circuit has strong electromagnetic environment resistance, and can not cause fluctuation to detection results due to overlarge electromagnetic interference of the environment. The circuit can be used as a part of circuits of electronic equipment to be integrated into the whole electronic circuit system, and has strong adaptability and high reliability.
Description
Technical Field
The utility model belongs to the technical field of grounding test, and particularly relates to a real-time grounding detection circuit.
Background
With the development of electronic technology, the smaller the volume of electronic products, the higher the integration level of electronic equipment, the higher the working speed of a computer and the more complex the electromagnetic environment. The metal shell of the equipment is required to be effectively grounded in the working process of each unit of the electronic equipment, which is a necessary condition for protecting the electrical safety of the electronic equipment and operators. If the electronic equipment is found to be ungrounded in the working process, the working is stopped and the grounding condition of the equipment is required to be checked. The original test scheme either performs a visual inspection of the ground conditions or performs a ground resistance test before the test begins.
And checking whether the connection of the grounding wires is firm and reliable or not by adopting a visual inspection method. The method relies on subjective judgment, is at risk of human error, and lacks technical guarantee for the state of the electronic equipment.
The static resistance is measured, namely the computer-controlled universal meter module measures the static resistance between each unit ground of the electronic equipment and the earth. There are two problems with this technique: 1. the multimeter module belongs to scarce resources on a computer, generally only 1 to 2 paths are configured, a channel is required to be switched to a multimeter for testing when the measurement is grounded, the channel is disconnected after the measurement is finished, real-time inspection cannot be realized, and if a unit grounding wire is disconnected in the working process of electronic equipment, the method cannot check the problem; 2. the static resistance test result is greatly influenced by electromagnetic and temperature and humidity environments, and is stable to use in a temperature and humidity control factory building, but false alarms caused by interference exist when electronic equipment is directly powered on in a temporary factory building even outdoors.
Disclosure of utility model
The utility model aims to provide a real-time grounding detection circuit, which displays the detection condition in real time for a user to know the grounding state of equipment, is simple and reliable, can stably work in a complex electromagnetic environment and an extreme temperature and humidity environment, and meets the use requirement of a severe environment.
In order to solve the problems, the technical scheme of the utility model is as follows:
a real-time ground detection circuit, comprising: a relay, a pull-up circuit and an IO module;
The positive input end of the IO module is electrically connected with the positive output end of the relay, the positive input end of the relay is electrically connected with the positive output end of the pull-up circuit, and the positive input end of the pull-up circuit is electrically connected with the positive electrode of the unit structure ground of the tested equipment;
The negative electrode of the tested equipment unit structure ground is connected with the negative input end of the pull-up circuit through a tested equipment grounding wire by a grounding pile, the negative output end of the pull-up circuit is electrically connected with the negative input end of the relay, and the negative output end of the relay is electrically connected with the negative input end of the IO module;
The output end of the IO module is connected with a display, and the display is used for displaying the measured voltage value in real time when in grounding detection.
According to an embodiment of the utility model, the pull-up circuit comprises a voltage comparator, an inverter and an OC gate with pull-up;
The positive input end of the voltage comparator is connected with the output end of a voltage dividing circuit, and receives a comparison voltage output by the voltage dividing circuit when the ground detection is performed;
the negative input end of the voltage comparator is electrically connected with the unit structure ground of the tested equipment;
The output end of the voltage comparator is electrically connected with the input end of the inverter, the output end of the inverter is electrically connected with the input end of the OC door with the pull-up function, and the output end of the OC door with the pull-up function is connected with the input end of the relay.
According to an embodiment of the utility model, the voltage dividing circuit comprises a first resistor and a second resistor;
One end of the first resistor is connected with a power supply of the tested equipment, and the other end of the first resistor is connected with a positive input end of the voltage comparator;
The second resistor is connected in parallel with the positive input end of the voltage comparator and the negative end of the power supply of the voltage comparator.
According to an embodiment of the utility model, the tested device unit structure is a plurality of units, and the positive input end of the pull-up circuit is electrically connected with the anodes of the plurality of unit structures.
By adopting the technical scheme, the utility model has the following advantages and positive effects compared with the prior art:
1) According to the real-time grounding detection circuit in the embodiment of the utility model, aiming at the problem that the state of the electronic equipment is short of technical guarantee due to the fact that subjective judgment is carried out by a visual inspection method, the detected structure is displayed on a computer screen in real time through an IO module, and the risk of human error judgment is eliminated.
2) According to the real-time grounding detection circuit in the embodiment of the utility model, aiming at the problems that a universal meter and an AD sampling module are not sensitive enough and the actual grounding condition of each unit of equipment cannot be effectively reflected in a place with complex electromagnetic environment, the grounding detection is realized by adopting the IO module and the relay with higher test sensitivity of electronic equipment, the real-time grounding detection circuit can stably work in the complex electromagnetic environment and extreme temperature and humidity environment, and the use requirement of a severe environment is met.
Drawings
FIG. 1 is a block diagram of a real-time ground detection circuit according to an embodiment of the present utility model;
Fig. 2 is a pull-up circuit diagram in an embodiment of the utility model.
Reference numerals illustrate:
1: a relay; 2: a pull-up circuit; 3: an IO module; 4: the tested equipment unit is structurally arranged; 5: a computer; 6: a voltage comparator; 7: an inverter; 8: with a pull-up OC door.
Detailed Description
The following describes in further detail a real-time ground fault detection circuit according to the present utility model with reference to the accompanying drawings and specific embodiments. Advantages and features of the utility model will become more apparent from the following description and from the claims.
The present embodiment provides a real-time ground detection circuit, please refer to fig. 1, which includes: relay 1, pull-up circuit 2, IO module 3. The positive input end of the IO module 3 is electrically connected with the positive output end of the relay 1, the positive input end of the relay 1 is electrically connected with the positive output end of the pull-up circuit 2, and the positive input end of the pull-up circuit 2 is electrically connected with the positive electrode of the tested equipment unit structural ground 4.
The negative pole of the tested equipment unit structure ground 4 is connected with the negative input end of the pull-up circuit 2 through the tested equipment grounding wire by the grounding pile, the negative output end of the pull-up circuit 2 is electrically connected with the negative input end of the relay 1, and the negative output end of the relay 1 is electrically connected with the negative input end of the IO module 3.
The output end of the IO module 3 is connected with a computer 5, and the computer 5 is used for displaying the measured voltage value in real time when in grounding detection.
The real-time grounding detection circuit has the characteristics of real-time monitoring, strong interference resistance and less occupied resources. The real-time monitoring is realized by converting the on-resistance into an electric signal and transmitting the electric signal to a computer of the electronic equipment, and the computer can monitor the grounding condition in real time and display the grounding condition on a display, so that the computer is convenient for operators to recognize.
The anti-interference is reflected in that the on-resistance is converted into an electric signal for testing, the electric signal testing has much higher anti-interference capability than the on-resistance testing, and the testing false alarm caused by factory environment or power supply interference can be restrained.
The occupied resources are less, and the method can be realized only by a pull-on circuit, a relay channel and an IO channel. In order to ensure the test sensitivity, the circuit is realized by using an IO channel without using a computer multimeter or an AD channel, and independently operates without using other circuit resources, so that the influence on the whole electronic circuit system is minimum, and the safety is highest.
The ground detection principle of the real-time ground detection circuit is as follows:
When the tested equipment does not work at ordinary times, the pull-up circuit does not supply power. When the test equipment is grounded, the pull-up circuit is connected with the power supply of the equipment. The IO module samples and measures the low voltage, then the structural ground which represents the unit is connected with the ground, and the ground is good; the IO module samples and measures the voltage of the pull-up circuit, the structural ground of the unit is not grounded, and an alarm prompt can be given on a display.
Referring to fig. 2, the pull-up circuit includes a voltage comparator 6, an inverter 7, and an OC gate 8 with pull-up. The positive input end of the voltage comparator 6 is connected with the output end of a voltage dividing circuit, and receives a comparison voltage output by the voltage dividing circuit during ground detection. The negative input of the voltage comparator 6 is electrically connected to the device under test cell structure 4. The output end of the voltage comparator 6 is electrically connected with the input end of the inverter 7, the output end of the inverter 7 is electrically connected with the input end of the OC gate 8 with pull-up, and the output end of the OC gate 8 with pull-up is connected with the input end of the relay 1.
The voltage dividing circuit comprises a first resistor R7 and a second resistor R9; one end of the first resistor R7 is connected with a power supply of the tested equipment, and the other end of the first resistor R is connected with a positive input end of the voltage comparator 6. The second resistor R9 is connected in parallel to the positive input terminal of the voltage comparator 6 and the negative power supply terminal of the voltage comparator 6.
The pull-up circuit works as follows:
During grounding detection, the positive end of the voltage comparator 6 receives a comparison voltage output by a voltage dividing circuit formed by a tested device power supply through R7 and R9, the resistance ratio of R7 and R9 can be adjusted according to the sensitivity degree of different units of the electronic device to ground line voltage, once the voltage of the unit ground exceeds the comparison voltage, the voltage comparator 6 outputs a low level, the voltage is reversely converted into a high level through the inverter 7, the high level is driven through an OC gate circuit with a pull-up power supply, and the high level is output to an IO module through a relay.
The real-time grounding detection circuit in the embodiment is mainly applied to electronic equipment, and is used for checking the grounding condition of each unit in the preparation stage and the whole operation process of the electronic equipment in real time, so that a user can know the real-time working state of each unit of the electronic equipment according to the detection result. The real-time grounding detection circuit not only can realize monitoring of a single unit structure ground, but also can realize simultaneous monitoring of a plurality of unit structure grounds. That is, when the device under test is plural in cell structure, the positive input terminal of the pull-up circuit may be branched off to electrically connect the anodes of the plural cell structures. Correspondingly, the cathodes of the cell structures are also connected to the negative input of the pull-up circuit. The grounding conditions of the structural areas of the units are monitored simultaneously, so that a user can know the real-time working state of each unit of the electronic equipment in real time, and the electronic equipment is very convenient.
In summary, the real-time grounding detection circuit in the embodiment has strong electromagnetic environment resistance, and cannot cause fluctuation to the detection result due to overlarge environmental electromagnetic interference. And the circuit can be used as a part of circuits of electronic equipment to be integrated into the whole electronic circuit system, so that the adaptability and the reliability are high. For example, the real-time ground detection circuit is not implemented on a printed circuit board, but can be implemented directly in the chassis. The detection circuit can be arranged on the inner side of the front panel of the case and fixed along with the wire harness, so that the design does not occupy extra space under the condition that the reliability of the product is not affected, and the sampling points are as close to the structures of all units as possible, thereby enhancing the anti-interference capability of the detection circuit.
The embodiments of the present utility model have been described in detail with reference to the drawings, but the present utility model is not limited to the above embodiments. Even if various changes are made to the present utility model, it is within the scope of the appended claims and their equivalents to fall within the scope of the utility model.
Claims (4)
1. A real-time ground detection circuit, comprising: a relay, a pull-up circuit and an IO module;
The positive input end of the IO module is electrically connected with the positive output end of the relay, the positive input end of the relay is electrically connected with the positive output end of the pull-up circuit, and the positive input end of the pull-up circuit is electrically connected with the positive electrode of the unit structure ground of the tested equipment;
The negative electrode of the tested equipment unit structure ground is connected with the negative input end of the pull-up circuit through a tested equipment grounding wire by a grounding pile, the negative output end of the pull-up circuit is electrically connected with the negative input end of the relay, and the negative output end of the relay is electrically connected with the negative input end of the IO module;
The output end of the IO module is connected with a display, and the display is used for displaying the measured voltage value in real time when in grounding detection.
2. The real time ground detection circuit of claim 1, wherein the pull-up circuit comprises a voltage comparator, an inverter, and an OC gate with pull-up;
The positive input end of the voltage comparator is connected with the output end of a voltage dividing circuit, and receives a comparison voltage output by the voltage dividing circuit when the ground detection is performed;
the negative input end of the voltage comparator is electrically connected with the unit structure ground of the tested equipment;
The output end of the voltage comparator is electrically connected with the input end of the inverter, the output end of the inverter is electrically connected with the input end of the OC door with the pull-up function, and the output end of the OC door with the pull-up function is connected with the input end of the relay.
3. The real time ground detection circuit of claim 2, wherein the voltage divider circuit comprises a first resistor, a second resistor;
One end of the first resistor is connected with a power supply of the tested equipment, and the other end of the first resistor is connected with a positive input end of the voltage comparator;
The second resistor is connected in parallel with the positive input end of the voltage comparator and the negative end of the power supply of the voltage comparator.
4. The real time ground detection circuit of claim 1, wherein the device under test is structurally multiple, and the positive input of the pull-up circuit is electrically connected to the anodes of the multiple unit structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420057567.1U CN221746262U (en) | 2024-01-10 | 2024-01-10 | Real-time grounding detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420057567.1U CN221746262U (en) | 2024-01-10 | 2024-01-10 | Real-time grounding detection circuit |
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| Publication Number | Publication Date |
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| CN221746262U true CN221746262U (en) | 2024-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420057567.1U Active CN221746262U (en) | 2024-01-10 | 2024-01-10 | Real-time grounding detection circuit |
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| CN (1) | CN221746262U (en) |
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- 2024-01-10 CN CN202420057567.1U patent/CN221746262U/en active Active
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