A dishwasher salt level signal detection circuit and detection method

Abstract

The invention relates to a detection circuit and a detection method for a salt content signal of a dishwasher. The detection circuit is characterized by comprising a single chip microcomputer, a detection device and a salt concentration sensing device, wherein a salt concentration signal sensed by the salt concentration sensing device is output to the detection device, the signal is processed by the detection device and then transmitted to the single chip microcomputer, and the single chip microcomputer confirms the input signal by virtue of the detection method. The detection method comprises the following steps of: a converting and filtering stage, detecting and processing of the single chip microcomputer, and a salt content information confirming stage. The invention has the beneficial effects that through the resources of the single chip microcomputer, analog voltage signals of the salt concentration sensor can be converted into digital signals by utilizing an AD (Analog-to-Digital) converter of the single chip microcomputer to complete the detection of salt content information so as to achieve the purpose of rapidly and accurately detecting the salt content information of the dishwasher. The hardware is simpler and easy to maintain, and a software design algorithm is easy to transplant.

Description

technical field [0001] The invention relates to the field of salt level accuracy detection of a dishwasher water softener, in particular to a dishwasher salt level signal detection circuit and a detection method, and belongs to the improvement technology of the dishwasher salt level signal detection circuit and detection method. Background technique [0002] Dishwashers are very popular in European and American countries. Because the hardness of water varies from place to place, the hardness of water will affect the washing effect. Therefore, in order to make the hardness of water achieve the ideal washing effect, the dishwasher will soften the water when it enters the water. deal with. The long-term use of the dishwasher will make the ability of softening water worse and worse. Dishwashers usually use the method of adding salt to soften the material to restore the soft water ability. Therefore, it is possible to quickly and accurately detect the amount of salt in the dishwa...

AI Technical Summary

Problems solved by technology

[0003] At present, the dishwashers in the prior art usually use a reed switch and a float with a certain density with a magnet to detect. The float is placed in a salt solution. According to the change of the concentration of the salt solution, the float will float or sink. The magnet drives the reed switch to pull in or disconnect, and judges the lack of salt through the signal processing of the reed switch; the signal generated by this method has only two states of on and off, and can only detect two states of salt and no salt. However, the salt information cannot be accurately detected; due to the individual differences of the float itself, the density will also vary. Interference will cause misjudgment; another disadvantage is that when the user is reminded of salt shortage, after adding salt in time, because the salt cannot be dissolved quickly, the concentration of the salt solution changes slowly, and the salt shortage reminder does not cancel for a long time, causing inconvenience to the user ; and this salt detection switch signal detection method needs to filter and debounce the signal, the hardware circuit is complicated, and the required structural parts are many, the assembly is complicated, and there are problems of inaccurate salt signal detection and slow detection response

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