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Optocoupler Isolation Circuits for Industrial Application Optocuploare în AplicaĊ£ii Industriale Down-link isolation takes a single optocoupler to pass a standard digital signal Detecting the presence of the mains voltage requires ground isolation Standard LED transmitter in optocouplers cuts half wave of the AC mainsvoltage, i.e. optocoupler also rectifies the input voltage Controlling both pulses of the mains Low Current Sensing By-passing the sensor with the optocoupler transmitter allows higher current sensing Same function for AC voltage detection Threshold Detector plus Isolated Switch Overvoltages in mains voltage are common Voltage Surge Damped Sinusoidal Voltage Spike is Typical Current Dividing Allows Level Adjustment Filtering capacitor smooths possible voltage spikes Non-dissipative voltage divider saves power Bi-polar voltage clamp uses dedicated components