Download - Optocoupler Isolation Circuits for Industrial Application Optocuploare în Aplicaţii Industriale
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Optocoupler Isolation Circuits for Industrial Application
Optocuploare în Aplicaţii Industriale
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Down-link isolation takes a single optocoupler to pass a standard digital signal
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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
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Controlling both pulses of the mains
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Low Current Sensing
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By-passing the sensor with the optocoupler transmitter
allows higher current sensing
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Same function for AC voltage detection
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Threshold Detector plus Isolated Switch
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Overvoltages in mains voltage are common
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Voltage Surge
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Damped Sinusoidal Voltage Spike is Typical
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Current Dividing Allows Level Adjustment
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Filtering capacitor smooths possible voltage spikes
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Non-dissipative voltage divider saves power
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Bi-polar voltage clamp uses dedicated components