A detection circuit for safety edge state

Abstract

The invention discloses a safety edge state detection circuit which comprises a voltage follower, a first comparator, a second comparator, a matching resistor, a first voltage-dividing and current-limiting resistor, a first current-limiting resistor, a second current-limiting resistor, a first voltage-dividing resistor, a second voltage-dividing resistor and a third voltage-dividing resistor. The non-inverting input end of the voltage follower is used for being connected with the output positive end of a safety edge sensor, the non-inverting input end of the first comparator is connected to the output negative end of the safety edge sensor through the third voltage-dividing resistor, the inverting input end of the first comparator is connected to the output end of the voltage follower through the first current-limiting resistor, and the non-inverting input end of the second comparator is connected to the inverting input end of the voltage follower and the output end of the voltage follower through the second current-limiting resistor. The safety edge sensor is used while a special controller is no longer necessary, so that equipment cost is lowered; whether the safety edge sensor is squeezed or not can be judged, and self break line fault of the safety edge sensor can be judged; a main controller receives status signals of the safety edge sensor directly, signal transmission delay is reduced, and whether security incidents happen or not can be detected in real time.

Description

technical field [0001] The invention belongs to the technical field of safety edge detection, and more specifically relates to a safety edge state detection circuit. Background technique [0002] The safety edge sensor is generally installed on the edge of the machine equipment, and when it is squeezed by the human body or other objects, it will output a status signal to achieve safety protection. Application fields: moving door, edge of moving trolley, packaging machinery, stamping machinery, pressure machinery, automobile manufacturing field, iron and steel metallurgy industry, assembly machinery, etc. [0003] Because it is related to personal safety, the accuracy, rapidity and reliability of the sensor signal detection by the controller are particularly important. [0004] The state signal of the safety edge sensor is generally led out by two wires. The current detection scheme uses a special controller provided by the manufacturer. When the safety edge sensor is squeez...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a safety edge state detection circuit, aiming to solve the problems of rapidity, economy and safety of safety edge detection

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