CN112285398A - Electric energy meter capable of detecting humidity abnormity - Google Patents
Electric energy meter capable of detecting humidity abnormity Download PDFInfo
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- CN112285398A CN112285398A CN202011080783.0A CN202011080783A CN112285398A CN 112285398 A CN112285398 A CN 112285398A CN 202011080783 A CN202011080783 A CN 202011080783A CN 112285398 A CN112285398 A CN 112285398A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/121—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid
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Abstract
An electric energy meter capable of detecting humidity abnormity comprises a base with a hollow inner part, an upper cover covered on the edge of the base, and a power supply, a PCB mainboard and an MCU detection circuit are fixedly arranged in the base, a first copper foil group, a second copper foil group, a 2M resistor string R23, a 2M resistor string R24, a 2M resistor string R25 and a 2M resistor string R26 are arranged on the PCB mainboard, the first copper foil group consists of two windowed copper foils with the distance of 0.2mm, the second copper foil group consists of two windowed copper foils with the distance of 0.1mm, the power supply is connected in series with the 2M resistor string R24 and is connected with current, the 2M resistor string R23, the 2M resistor string R25 and the 2M resistor string R26 are connected in parallel and then are connected with the 2M resistor string R24 in series to be connected with a circuit, the first copper foil group is connected with the 2M resistor string R26 in series and connected into a circuit, the second copper foil group is connected with the 2M resistor string R23 in series and connected into the circuit, and the MCU detection circuit detects the voltage at two ends of the three resistors after being connected in parallel. The design has the advantages of high detection speed and simple structure.
Description
Technical Field
The invention relates to the field of electric energy meters, in particular to an electric energy meter capable of detecting humidity abnormity.
Background
The current mainstream electric energy meter basically cannot carry out the humidity detection design in the electric energy meter due to a plurality of factors such as the design of the structure of the electric energy meter, and in the application areas with relatively large humidity all the year round such as the south of China, the environmental humidity still has partial influence on the normal work of the electric energy meter, so that the humidity detection capability of the electric energy meter is required, the humidity feedback can be carried out in time under the condition of overlarge humidity, the maintenance of the electric energy meter can be carried out immediately, the current humidity can not be detected in real time in the existing electric energy meter, even if a few electric energy meters which can carry out the humidity detection can be carried out, the humidity detection can be finally finished by matching extremely complicated sensor components with other sensing equipment through complicated sensing, calculating, processing and other complicated steps, the whole process is relatively complicated and troublesome, the application cost is too high, the requirements of the current market on the humidity detection and the low cost can not be met, on the other hand, the sensing detection components and parts are more, and more space needs to be occupied in the electric energy meter, which is contrary to the mainstream requirement of the miniaturization of the design of the existing electric energy meter, and the reason causes the difficulty of the humidity detection design of the existing electric energy meter.
Disclosure of Invention
The invention aims to provide an electric energy meter which has high detection speed and a simple structure and can detect humidity abnormity.
In order to solve the technical problems, the invention adopts the following technical scheme: an electric energy meter capable of detecting humidity abnormity comprises a base with a hollow inner part, an upper cover covered on the edge of the base, and a power supply, a PCB mainboard and an MCU detection circuit are fixedly arranged in the base, a first copper foil group, a second copper foil group, a 2M resistor string R23, a 2M resistor string R24, a 2M resistor string R25 and a 2M resistor string R26 are arranged on the PCB mainboard, the first copper foil group consists of two windowed copper foils with the distance of 0.2mm, the second copper foil group consists of two windowed copper foils with the distance of 0.1mm, the power supply is connected in series with the 2M resistor string R24 and is connected with current, the 2M resistor string R23, the 2M resistor string R25 and the 2M resistor string R26 are connected in parallel and then are connected with the 2M resistor string R24 in series to be connected with a circuit, the first copper foil group is connected with the 2M resistor string R26 in series and connected into a circuit, the second copper foil group is connected with the 2M resistor string R23 in series and connected into the circuit, and the MCU detection circuit detects the voltage at two ends of the three resistors after being connected in parallel;
the power supply inputs 5V voltage, when the humidity of the PCB mainboard is less than 50%, the first copper foil group and the second copper foil group are both open circuits, the voltage detected by the MCU detection circuit is 2.5V, and the humidity of the PCB mainboard is in a normal state;
the power input 5V voltage, when PCB mainboard humidity is more than or equal to 50%, first copper foil group open circuit, second copper foil group short circuit, second copper foil group and 2M resistance string R25 access circuit after parallelly connected, the voltage that MCU detection circuitry detected is 1.67V, and PCB mainboard humidity is abnormal state this moment.
Further, the power supply inputs 5V voltage, when the humidity of the PCB mainboard is greater than or equal to 95%, the first copper foil group is in short circuit, the second copper foil group is in short circuit, the 2M resistor string R23, the 2M resistor string R25 and the 2M resistor string R26 are connected in parallel and then are connected into the circuit, the voltage detected by the MCU detection circuit is 0.25V, and the humidity of the PCB mainboard is in an abnormal state.
The invention has the beneficial effects that: the invention carries out the detection of the circuit voltage by the series connection of the first copper foil group, the second copper foil group and the 2M resistor string and the parallel connection of a plurality of 2M resistor strings, because of the change of the humidity, the first copper foil group and the second copper foil group with different distances between two pairs of windowed copper foils realize the switching of different states of open circuit and short circuit, so that the resistances after the three resistors are connected in parallel under different humidities are different, and finally the detection of the humidity change on the current PCB mainboard can be completed according to the different voltage values detected by the MCU detection circuit, the invention affects the circuit resistance by different humidities, leads the resistance to correspondingly change along with the humidity, further carries out the detection of the current humidity by obtaining and judging the voltage values, compared with the electric energy meter which has more sensing elements, complicated structure and occupies more space in the electric energy meter, the invention carries out the detection of the humidity in the electric energy meter by the circuit, the electric energy meter has the advantages that the structure is relatively simplified, the application of the sensing element with extremely high application cost is reduced, the design cost is greatly reduced, meanwhile, the detection result of the electric energy meter is fed back very quickly, the information such as whether the humidity in the current electric energy meter is normal can be obtained in real time, the occupation of precious space in the electric energy meter is reduced, the design requirement for miniaturization of the electric energy meter is not influenced, the design requirement for miniaturization of the design of the current electric energy meter is met, compared with the application of the sensor element, the design of circuit detection is relatively more stable and is not prone to error, even after a fault occurs, the overhaul and maintenance of the fault are simpler and more direct compared with the application of the sensor element, and the overhaul and maintenance cost is.
Drawings
Fig. 1 is a humidity detection circuit diagram of an electric energy meter capable of detecting humidity abnormality.
Detailed Description
In order to make the technical means, innovative features and functions of the present invention easy to understand, the present invention will be further described below.
As shown in fig. 1, the electric energy meter capable of detecting humidity abnormality according to the present invention comprises a base with a hollow interior, an upper cover covering the edge of the base, and a power supply, wherein a PCB main board and an MCU detection circuit are fixedly disposed in the base, the PCB main board is provided with a first copper foil group, a second copper foil group, a 2M resistor string R23, a 2M resistor string R24, a 2M resistor string R25, and a 2M resistor string R26, the first copper foil group is composed of two windowed copper foils with a spacing of 0.2mm, the second copper foil group is composed of two windowed copper foils with a spacing of 0.1mm, the power supply is connected in series with the 2M resistor string R24 and is connected with current, the 2M resistor string R23, the 2M resistor string R25, and the 2M resistor string R26 are connected in parallel and then connected in series with the 2M resistor string R24 and connected with the circuit, the first copper foil group is connected in series with the 2M resistor string R26 and connected with the circuit in series, and connected with the second copper foil group in series with the circuit 23, the MCU detection circuit detects voltages at two ends of the three resistors after being connected in parallel;
the power supply inputs 5V voltage, when the humidity of the PCB mainboard is less than 50%, the first copper foil group and the second copper foil group are both open circuits, the voltage detected by the MCU detection circuit is 2.5V, and the humidity of the PCB mainboard is in a normal state;
the power input 5V voltage, when PCB mainboard humidity is more than or equal to 50%, first copper foil group open circuit, second copper foil group short circuit, second copper foil group and 2M resistance string R25 access circuit after parallelly connected, the voltage that MCU detection circuitry detected is 1.67V, and PCB mainboard humidity is abnormal state this moment.
In the practical application process, under the condition of meeting the normal humidity detection requirement, the detection requirement of the high humidity range still exists, so in a preferred embodiment of the invention, the circuit detection when the humidity is greater than or equal to 95% is also designed, namely, the power supply inputs 5V voltage, when the humidity of the PCB mainboard is greater than or equal to 95%, the first copper foil group is short-circuited, the second copper foil group is short-circuited, the 2M resistor string R23, the 2M resistor string R25 and the 2M resistor string R26 are connected in parallel and then are connected into a circuit, the voltage detected by the MCU detection circuit is 0.25V, and the humidity of the PCB mainboard is in an abnormal state at this time.
Due to the influence of factors such as the electric energy meter, the humidity, the region, the environment and the like, in practical application, only 50% of the humidity is required to be detected, in the invention, a circuit can be designed by designing a plurality of copper foil groups, different humidities are detected by setting the distance between two windowed copper foils of the copper foil groups, the detection condition of the humidity in the electric energy meter is obtained, the humidity detection range of the electric energy meter is further refined, the refinement of the humidity detection in the electric energy meter is realized, the early warning before the humidity in the electric energy meter reaches the abnormity is realized as far as possible, the faults caused by short circuit due to the humidity abnormity in the electric energy meter are reduced, the overhaul and maintenance operation after the faults are prevented in advance, the overhaul and maintenance cost is reduced, and meanwhile, the labor cost is also reduced.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (2)
1. An electric energy meter capable of detecting humidity abnormity is characterized in that: comprises a base with a hollow inner part, an upper cover covered on the edge of the base opening, and a power supply, wherein a PCB main board and an MCU detection circuit are fixedly arranged in the base, the PCB main board is provided with a first copper foil group, a second copper foil group, a 2M resistor string R23, a 2M resistor string R24, a 2M resistor string R25 and a 2M resistor string R26, the first copper foil group consists of two windowed copper foils with the distance of 0.2mm, the second copper foil group consists of two windowed copper foils with the distance of 0.1mm, the power supply is connected in series with the 2M resistor string R24 and is connected with current, the 2M resistor string R23, the 2M resistor string R25 and the 2M resistor string R26 are connected in parallel and then are connected with the 2M resistor string R24 in series to be connected with a circuit, the first copper foil group is connected with the 2M resistor string R26 in series and connected into a circuit, the second copper foil group is connected with the 2M resistor string R23 in series and connected into the circuit, and the MCU detection circuit detects the voltage at two ends of the three resistors after being connected in parallel; the power supply inputs 5V voltage, when the humidity of the PCB mainboard is less than 50%, the first copper foil group and the second copper foil group are both open circuits, the voltage detected by the MCU detection circuit is 2.5V, and the humidity of the PCB mainboard is in a normal state; the power input 5V voltage, when PCB mainboard humidity is more than or equal to 50%, first copper foil group open circuit, second copper foil group short circuit, second copper foil group and 2M resistance string R25 access circuit after parallelly connected, the voltage that MCU detection circuitry detected is 1.67V, and PCB mainboard humidity is abnormal state this moment.
2. An electric energy meter capable of detecting humidity abnormality according to claim 1, characterized in that: the power input 5V voltage, when PCB mainboard humidity is more than or equal to 95%, first copper foil group short circuit, second copper foil group short circuit, 2M resistance string R23, 2M resistance string R25, 2M resistance string R26 insert the circuit after connecting in parallel, the voltage that MCU detection circuitry detected is 0.25V, PCB mainboard humidity is abnormal state this moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011080783.0A CN112285398B (en) | 2020-10-11 | 2020-10-11 | Electric energy meter capable of detecting humidity abnormality |
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| CN202011080783.0A CN112285398B (en) | 2020-10-11 | 2020-10-11 | Electric energy meter capable of detecting humidity abnormality |
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| CN112285398A true CN112285398A (en) | 2021-01-29 |
| CN112285398B CN112285398B (en) | 2023-08-08 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202150057U (en) * | 2011-06-15 | 2012-02-22 | 杭州滨鸿光电科技有限公司 | Humidity control cabinet circuit |
| JP2014178137A (en) * | 2013-03-13 | 2014-09-25 | Mitsubishi Materials Corp | Humidity sensor |
| CN207114465U (en) * | 2017-07-23 | 2018-03-16 | 罗必君 | A kind of more gear soil humidity measuring circuits |
| CN109706713A (en) * | 2019-03-08 | 2019-05-03 | 黄俊杰 | Controller of clothes drier |
| CN110794003A (en) * | 2019-11-05 | 2020-02-14 | 兰州兰石集团兰驼农业装备有限公司 | Multi-layered soil humidity sensor |
| CN210543263U (en) * | 2019-07-05 | 2020-05-19 | 重庆兴狼科技有限公司 | Humidity judgment circuit control system |
-
2020
- 2020-10-11 CN CN202011080783.0A patent/CN112285398B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202150057U (en) * | 2011-06-15 | 2012-02-22 | 杭州滨鸿光电科技有限公司 | Humidity control cabinet circuit |
| JP2014178137A (en) * | 2013-03-13 | 2014-09-25 | Mitsubishi Materials Corp | Humidity sensor |
| CN207114465U (en) * | 2017-07-23 | 2018-03-16 | 罗必君 | A kind of more gear soil humidity measuring circuits |
| CN109706713A (en) * | 2019-03-08 | 2019-05-03 | 黄俊杰 | Controller of clothes drier |
| CN210543263U (en) * | 2019-07-05 | 2020-05-19 | 重庆兴狼科技有限公司 | Humidity judgment circuit control system |
| CN110794003A (en) * | 2019-11-05 | 2020-02-14 | 兰州兰石集团兰驼农业装备有限公司 | Multi-layered soil humidity sensor |
Non-Patent Citations (1)
| Title |
|---|
| 朱建华 等: "一种评价印制线路板耐污染能力的试验方法", 电子产品可靠性与环境试验, vol. 31, no. 4, pages 1 - 6 * |
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