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Detection circuit designed on basis of Pi-shaped LC filter

An LC filter and detection circuit technology, applied in the detection field, can solve the problems of inaccurate humidity sensors and different indication values, and achieve the effect of improving the running time and life and ensuring smooth operation.

Pending Publication Date: 2016-12-21
成都沃尔法特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some users use the wet and dry bulb hygrometer to compare the humidity sensor they just bought. If they find that the indications are different, they immediately think that the humidity sensor is inaccurate.

Method used

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  • Detection circuit designed on basis of Pi-shaped LC filter

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] A detection circuit designed based on a π-type LC filter, which uses a π-type LC filter for power supply filtering processing, effectively reduces the ripple content of the power supply to the humidity detection processing circuit, and ensures that the humidity detection processing circuit can work safely and stably , to provide a basic guarantee for safe, stable, sensitive and reliable detection of environmental humidity, such as figure 1As shown, the following structure is specially set up: including a transformer T, a rectification circuit, a filter circuit and a humidity detection processing circuit, the primary end of the transformer T is connected to a 220V AC power supply, and the secondary end of the transformer T is connected to the AC input of the rectification circuit The terminals are connected, the DC output terminal of the rectifier circuit is connected to the filter circuit, and the filter circuit is connected to the humidity detection processing circuit; ...

Embodiment 2

[0037] This embodiment is further optimized on the basis of the above-mentioned embodiments, further to better realize the present invention, such as figure 1 As shown, the following arrangement structure is particularly adopted: a switch K1 and a resistor R1 are arranged in the switch circuit, one end of the switch K1 is connected to the second end of the inductor L, and the other end of the switch K1 is connected to the first end of the resistor R1 The second end of the resistor R1 is connected to the voltage regulator circuit. When the switch K1 is turned on, the output power after ripple filtering will be cut off, so that it will not be loaded on the humidity detection processing circuit, and the whole circuit will not work. ; When the switch K1 is closed, the output power after ripple filtering will supply the structural switch K1 and the resistor R1 to the humidity detection processing circuit, and the humidity detection processing circuit will perform humidity detection ...

Embodiment 3

[0039] This embodiment is further optimized on the basis of any of the above embodiments, further to better realize the present invention, such as figure 1 As shown, the following arrangement structure is adopted in particular: a regulator tube Z1 is arranged in the voltage regulator circuit, the negative pole of the voltage regulator tube Z1 is connected to the second end of the resistor R1, the positive pole of the voltage regulator tube Z1 is connected to the capacitor C7 The second end is connected.

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Abstract

The invention discloses a detection circuit designed on basis of a Pi-shaped LC filter. The detection circuit comprises a transformer T, a rectifier circuit, a filter circuit and a humidity detection processing circuit, a capacitor C6, an inductor L and a capacitor C7 are arranged in the filter circuit, a first end of the capacitor C6 is connected with a first end of the inductor L and one end of a direct-current output end of the rectifier circuit respectively, a second end of the inductor L is connected with the humidity detection processing circuit and a first end of the capacitor C7 respectively, a second end of the capacitor C7 is connected with a second end of the capacitor C6 and connected with another end of the direct-current output end of the rectifier circuit, the second end of the capacitor C7 is connected with the humidity detection processing circuit, and a switch circuit, a voltage stabilizing circuit, a time-based oscillating circuit and a sensor circuit are arranged in the humidity detection processing circuit. The Pi-shaped LC filter is adopted for filtering, ripple wave content of a power source provided to the humidity detection processing circuit is lowered effectively, and safe and stable working of the humidity detection processing circuit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a detection circuit designed based on a π-type LC filter. Background technique [0002] Humidity is a physical quantity that expresses the degree of dryness of the atmosphere. The less water vapor there is in a given volume of air at a given temperature, the drier the air; the more water vapor, the wetter the air. The degree of dryness and humidity of the air is called "humidity". In this sense, it is often expressed by physical quantities such as absolute humidity, relative humidity, comparative humidity, mixing ratio, saturation difference, and dew point; if it expresses the weight of water vapor in wet steam as a percentage of the total weight (volume) of steam, it is called is the humidity of the steam. The humidity that the human body feels comfortable is: the relative humidity is lower than 70%. [0003] There are three basic forms of humidity, namely water vapor pres...

Claims

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Application Information

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IPC IPC(8): G01N27/22
CPCG01N27/223G01N27/228
Inventor 姚清群
Owner 成都沃尔法特科技有限公司
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