portable air purifier..Circuit diagram principle of automatic air humidifier

　　Dynamic control humidifiers can be used for humidity control in office and home environments, as well as for humidity control in hatcheries or juvenile poultry houses in poultry farms. When the humidity is below 50%, the humidifier can automatically work and maintain a certain humidity environment, which is beneficial for the health of both humans and animals.

　　After the AC 220V voltage is reduced by T, rectified by UR1, filtered by C1, and stabilized by IC1, a+12V voltage is generated and supplied to the humidity control circuit, while the VL is lit up; The other way is through T voltage reduction, R1 and R2 current limiting, VS1 and VS2 voltage stabilization, and clipping to become a flat top AC voltage. This AC voltage is adjusted and sampled by RP1, step-down by RS, and rectified by UR2 to become a DC voltage. It is then filtered and limited by C3, R3, and C4 before being added to the ammeter PA. The resistance value of RS varies with humidity. The higher the environmental humidity, the smaller the resistance value of RS, and the greater the DC current flowing through PA.

　　When the humidity is low, the current flowing through R4 is also small. IC2 outputs a high level due to the voltage at the reverse input terminal being lower than the reference voltage at the positive input terminal, causing VT to conduct, K to engage, and its normally open contact to connect, enabling the humidifier to work with electricity. As the air humidity continues to increase, the resistance of RS also begins to gradually increase, and the voltage at the inverted input terminal of IC2 also continues to rise. When the humidity reaches the set humidity, IC2 outputs a low level due to the reverse input voltage being higher than its positive input voltage, causing VT to cut off and K to release. Its normally open contact cuts off the working power supply of the humidifier. By working repeatedly like this, the environmental humidity can be controlled within the set humidity range,

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