Improved method for determining the state of a relay with light-emitting diodes in the middle

Abstract

This invention relates to the field of electrical control technology, and in particular to an improved method for determining the state of an intermediate relay with an LED, comprising the following steps: setting a current sensing node in the main power supply circuit of the intermediate relay coil; connecting the electrical signal obtained by the current sensing node to a state indication branch, the state indication branch including at least one light-emitting element; configuring the state indication branch to output light signals with different visual characteristics based on the differences in electrical characteristics exhibited by the current sensing node when the intermediate relay coil is in different physical states; wherein, the different physical states include at least: the coil is normally energized and engaged, the coil circuit electrical continuity is interrupted, and the coil winding impedance deviates from the rated range; the differences in the visual characteristics of the light signals are used to correspond to the physical state of the intermediate relay coil; this invention achieves more accurate and multi-level relay operating state determination and indication.

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