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source:Air purifier Merchant release time:2021-10-23 Hits: Popular:aromatherapy diffuser direct sales
Among them, the principle of water detection and frequency tracking of the atomized film is involved. Many MCU manufacturers encapsulate this part of the code, so many small partners are not clear about the basic scheme of water detection and frequency tracking through the atomized film. Analyze it.
◆Frequency chasing principle:
The humidifier developed based on the single-chip microcomputer can automatically chase the frequency to the resonance point. Its realization principle is as follows
The relationship between the voltage across the atomizer sheet and its oscillation frequency is in a normal distribution, as shown in the figure below:
Aromatherapy machine
Through the relationship between the voltage and the frequency, the software algorithm can be used to track the frequency point, so that the atomization film always works at the frequency point.
A humidifier based on a single-chip microcomputer uses the voltage characteristic changes of the atomizer when there is water and when there is no water to detect whether there is water. During normal operation, the oscillating voltage of the atomizing film is stable within a normal range, with little change. When the water volume is reduced to a certain level or there is no water, the voltage across the oscillating plate will suddenly increase or rise. Through such a change law to determine whether there is water in the humidifier.
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