Detection circuit for filtering net of air purifier and detection method

Abstract

The invention discloses a detection circuit for a filtering net of an air purifier and a detection method. The detection circuit comprises a direct-current power supply, a first amplifier, a second amplifier and a single chip microcomputer, wherein a motor and a resistor are connected between a positive electrode and a negative electrode of the power supply in sequence and in series; the negative electrode of the power supply is grounded; a positive electrode of the motor is connected with an input positive electrode of the second amplifier; an input negative electrode of the second amplifier provides a first reference voltage; the output of the second amplifier is connected with an A / D1port of the single chip microcomputer; the input positive electrode of the second amplifier is connected with the connecting end of the resistance and the motor; the input negative electrode of the second amplifier provides a second reference voltage; the output end of the first amplifier is connected with an A / D2 port of the single chip microcomputer; a rotating-speed adjusting port of the motor is connected with a Vsp port of the single chip microcomputer; and a rotating-speed feedback port of the motor is connected with an FG port of the single chip microcomputer. The detection circuit and the detection method disclosed by the invention have the advantages that the structure is simple, the implementation is easy, and the judgment is accurate; due to arrangement of overcurrent protection, the burnout of the detection circuit in overcurrent is avoided; the cost of an LM358 is low; and due to arrangement of a switch, convenience is brought for starting and stopping the function, so that the waste of electric energy when not in use is avoided.

Description

technical field [0001] The invention belongs to the field of detection circuits, in particular to a detection circuit for air purifier filter screens. Background technique [0002] Most of the current air purifiers use filter screens to filter the air entering the air purifier. Due to the reciprocating circulation of the air in the air purifier, dust, fibers and other debris in the air are continuously accumulated and precipitated on the filter screen. The wind resistance continues to increase, the filtration efficiency of the air purifier decreases, and the utilization rate of energy decreases. [0003] At present, there are mainly four solutions to solve this problem on air purifiers: [0004] 1. Determine whether the filter screen needs to be cleaned by detecting the air volume. The cost of this solution is very high, which is not conducive to product realization. [0005] 2. Determine whether the filter screen needs to be cleaned by detecting the wind speed. The cost...

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Problems solved by technology

The cost of this solution is very high, which is not conducive to product realization

[0006] 3. It is detected by attaching an independent timing module to the outside of the air purifier. This method adopts artificial setting of the filter usage time, and the time calculation is performed independently from the first time the user starts using it. , ignoring the time when the user does not turn on the machine and the change of the external air quality environment, so this kind of detection cannot reflect the real service life of the filter at all, and it cannot accurately remind the user of the cleaning time of the filter, and it increases the cost

[0007] 4. The detection is carried out by calculating the start-up time of the air purifier. This method adopts the artificial setting of the filter usage time, ignoring the changes in the external air quality environment, so this detection cannot really reflect the service life of the filter, let alone give an accurate reminder User filter cleaning time

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