A signal detection circuit for marine engineering equipment

Abstract

The present invention relates to a signal detection device for marine engineering equipment. The device includes a voltage divider, an amplifier, and a comparator. The voltage divider obtains a first voltage not greater than 0.6 volts; the first voltage is input to the The noninverting input terminal of the amplifier, the signal line is connected to the inverting input terminal of the amplifier through the first resistor (R3), and the two ends of the second resistor (R4) are respectively connected to the inverting input terminal of the amplifier and the inverting input terminal of the amplifier. output terminal; the output terminal (U1) of the amplifier is connected to the same input terminal of the comparator, and the third resistor (R5) and the fourth resistor (R6) divide the 24 volt voltage to obtain the second voltage and connect it to the The inverting input terminal of the comparator is used to determine the medium type between the signal line and the signal common line according to the output of the comparator. The invention solves the misjudgment problem of existing seawater short-circuit and wire short-circuit, and improves the working safety of marine engineering equipment.

Description

technical field [0001] The invention relates to the technical field of signal detection and control, in particular to signal detection and control of marine engineering equipment. Background technique [0002] Ocean engineering equipment is connected to the equipment under test in seawater through special cables. Under normal circumstances, the signal line in the special cable and the signal common line are connected by wires in the equipment under test. Once the special cable is torn off by the tugboat or cut off by the propeller At this time, the inner core wire of the special cable will be soaked in seawater. Since seawater has a strong conductivity, how to accurately and quickly judge whether the signal line and the signal common line in the special cable are short-circuited under normal conditions or are blocked. The short circuit of seawater after cutting is an important basis for judging whether the marine engineering equipment and the equipment under test are connect...

AI Technical Summary

Problems solved by technology

Since the seawater is applying 5v voltage, the current limiting resistor is 4.4KΩ (R 75 +R 112 ) still has a strong conductivity, generally the resistance value is greater than 1KΩ, but the concentration of conductive ions in seawater is slightly high or other abnormal conditions can easily cause the equivalent resistance of seawater in the X area to be less than 1KΩ, so that The result of signal acquisition is the same as the acquisition result when the signal line L and the signal common line LGND are short-circuited by a wire, so that the marine engineering equipment will misjudge that the equipment under test is still connected normally

[0009] Through the analysis of the above situation, it can be seen that the signal acquisition device on the existing marine engineering equipment does not effectively use the conductive characteristics of seawater, which makes it very difficult to judge whether the signal line L and the signal common line LGND are shorted by wires or seawater. Judgment problems, ranging from causing abnormal communication between equipment, to causing damage to the power module in the offshore engineering equipment, and even causing safety accidents to the platform where the offshore engineering equipment is located

Images