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    • 10. 发明公开
    • ISOLATED FEEDBACK CIRCUIT FOR DETECTING OUTPUT STATE OF OPTOCOUPLER
    • EP4394402A1
    • 2024-07-03
    • EP22944426.0
    • 2022-06-28
    • Opt Machine Vision Tech Co., Ltd.
    • LI, Zhirong
    • G01R31/00G01R19/165
    • Provided is an isolated feedback circuit for detecting an output state of an optocoupler applied to an optocoupler module connected to a load. The circuit includes a main control module, an isolated feedback module, a current detection module, an upper current limit comparison module, a lower current limit comparison module, a voltage detection module, and a voltage comparison module. The optocoupler module is further separately connected to the main control module and the current detection module. The current detection module is separately connected to the upper current limit comparison module and the lower current limit comparison module. The voltage detection module is connected in parallel with the load, and the voltage detection module is connected to the voltage comparison module. The upper current limit comparison module, the lower current limit comparison module, and the voltage comparison module are all connected to the isolated feedback module. The isolated feedback module is connected to the main control module. The output state of the output terminal of the optocoupler module can be clearly learned in real time, so as to learn the abnormality of the output terminal of the optocoupler module in time, thereby reducing the impact on the normal output of the signal and avoiding safety problems.