System and method for judging working state of capacitive sensor

Abstract

The invention relates to the field of circuit judgment, in particular to a system and a method for judging the working state of a capacitive sensor. The system comprises: a capacitance sensing modulefor sensing a capacitance signal sent by the capacitive sensor; an oscillation module connected to the capacitance sensing module and used for generating an oscillation signal; a current detection module; an I / O conversion module; a voltage dividing module; and a judgment module. The method comprises the following steps: the oscillation module transmits a load current to the current detection module; the current detection module converts the load current into an output current; the I / O conversion module converts the output current to an output voltage; the voltage dividing module divides a reference voltage into at least one divided voltage, and outputs a level according to the output voltage and the divided voltage; and the judgment module judges the working state of the capacitive sensoraccording to the level. According to the system and the method for judging the working state of the capacitive sensor, by detecting the output current, and comparing the output voltage with the divided voltage, the working state of the capacitance sensor is accurately judged, and wrong movement is avoided when laser cutting is performed.

Description

technical field [0001] The invention relates to the field of judging circuits, in particular to a system and method for judging the working state of a capacitive sensor. Background technique [0002] In laser cutting, the capacitive sensor is an important component, which is usually installed at the lower part of the cutting head to sense the distance from the nozzle to the workpiece to be cut. [0003] During the cutting process, it is very important to obtain the working state of the capacitive sensor. Traditionally, the method of judging the working state of the capacitive sensor is to send a frequency signal related to the capacitance value through the oscillating circuit. Then, the height adjustment device judges the magnitude of the frequency value. When the frequency value is less than a certain value, it is judged that the nozzle collides with the workpiece to be cut. Send an alarm signal to remind the operator; when the height adjustment device does not detect the ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a system and method for judging the working state of the capacitive sensor in view of the above-mentioned defects of the prior art, so as to solve the problem that the working state of the capacitive sensor cannot be accurately judged

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