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Stable optocoupler

2017-09-04 12:25  
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A circuit stabilizes the current-transfer ratio (CTR) of an optically coupled isolator used as a linear transducer. The optocoupler produces a voltage output that is proportional toa€”but electrically isolated froma€”the voltage input. However, the output voltage is directly affected by changes in the CTR, and the CTR can change substantially with temperature and current. To a lesser extent the CTR changes with time over the life of the optocoupler. The circuit employs a feedback circuit containing a second optocoupler.
Stable optocoupler

The feedback signal tends to oppose changes in the overall CTR.

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