Liquid level detection device and method and dish washing machine

Abstract

The invention provides a liquid level detection device and method and a dish washing machine. The liquid level detection device comprises a first circuit, an energy storage circuit and a control chip,wherein the first circuit comprises a first metal probe positioned at a first set height of a liquid container; the first metal probe is connected to a first power supply end through a first resistor, and is connected to a first output end through a second resistor; the energy storage circuit comprises a third metal probe located at the lowest position of the liquid container; the third metal probe is grounded through an energy storage capacitor; the control chip has a driving end for outputting a pulse voltage to the first power supply end and a first acquisition end for acquiring a probe signal through the first output end; and whether liquid exists at the first set height or not is judged through the probe signal. According to the design, the influence of liquid properties is relatively small, and earth interference signals are isolated, so that the interference of the environment to the liquid level detection can be effectively avoided, and the accuracy of the liquid level detection is improved. Compared with the prior art of Hall detection, proximity switch detection or the like, the device is simple in circuit, easy to implement and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of liquid level detection devices, in particular to a liquid level detection circuit, a detection method and a dishwasher. Background technique [0002] At present, household appliances containing liquid containers, such as dishwashers, kettles, electric water tanks, washing machines, etc., have become the necessities of people's home life, and with the advancement of technology, these household appliances are becoming more and more intelligent. The automatic control of liquid containers has become an important direction of intelligent development. The detection of the liquid level in the liquid container is a key indicator of automatic control and the basis for ensuring the safe operation of household appliances. Therefore, accurate measurement of the liquid level in the liquid container is a necessary prerequisite for realizing intelligence. [0003] In view of this, the patent with the publication numbe...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome defects such as inaccurate detection structure of the liquid level detection device in the prior art, being easily disturbed, and difficult circuit design, thereby providing a liquid level detection device, a detection method and a dishwashing device. machine

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