Switching value input circuit suitable for non-polar multi-level voltage input

Abstract

The invention discloses a switching value input circuit suitable for non-polar multi-level voltage input, which comprises a first switching value interface and a second switching value interface, thefirst switching value interface is connected with a first input end of a rectifier bridge, and the second switching value interface is connected with a second input end of the rectifier bridge; the first input end of the rectifier bridge is connected with the cathode of the diode; the anode of the diode is connected with a first power supply; the second input end of the rectifier bridge is connected with the second input end of the logic gate device through the second optocoupler isolation sampling circuit, the first output end of the rectifier bridge is connected with the first input end of the logic gate device through the first optocoupler isolation sampling circuit, and the second output end of the rectifier bridge is electrically connected with the first electrical appliance. A circuit design scheme with wide compatibility is provided for information acquisition of the switching value nodes, the connection polarity of the switching value nodes does not need to be considered, and the circuit is suitable for information acquisition of the switching value nodes of multiple levels.

Description

Technical field [0001] The invention relates to the technical field of digital signal acquisition of secondary equipment in intelligent substations, and in particular to a switch input circuit suitable for non-polar multi-level voltage input. Background technique [0002] With the rapid development of smart grids in my country, there are more and more switches in the integrated automation system of substations. The collected signals include the trip position signals of circuit breakers, isolating switches, and grounding switches, the position signals of transformer taps, and various Relay protection, automatic device action signal, etc. [0003] At present, the traditional information collection method of switching value nodes is to rely on the conduction state of the optocoupler to determine the status of the switching value node. The acquisition circuit can only collect information for the state of a single level switching value, and the acquisition circuit needs Strictly require...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional information collection method of switching value nodes relies on the conduction state of the optocoupler to judge the state of the switching value nodes. Strictly require the polarity direction of the node, otherwise, in the case of reversed polarity of the node, the acquisition will not be possible, and it is more likely to cause damage to the acquisition circuit

In addition, the node voltages of switching value acquisition in substations are also different, such as 24V, 110V and 220V, etc. Therefore, the traditional switching value acquisition circuit needs to be adjusted accordingly according to the node voltage of the switching value, and this adjustment is time-consuming. force

Images