1. Optocoupler Isolation Circuits for Industrial Application
Optocuploare în Aplicaţii Industriale

2. Down-link isolation takes a single optocoupler to pass a standard digital signal

3. Detecting the presence of the mains voltage requires ground isolation
Standard LED transmitter in optocouplers cuts half wave of the AC mains-voltage, i.e. optocoupler also rectifies the input voltage

4. Controlling both pulses of the mains

5. Low Current Sensing

6. By-passing the sensor with the optocoupler transmitter allows higher current sensing

7. Same function for AC voltage detection

8. Threshold Detector plus Isolated Switch

9. Overvoltages in mains voltage are common

10. Voltage Surge

11. Damped Sinusoidal Voltage Spike is Typical

12. Current Dividing Allows Level Adjustment

13. Filtering capacitor smooths possible voltage spikes

14. Non-dissipative voltage divider saves power

15. Bi-polar voltage clamp uses dedicated components