220V Power Line Interface


Posted on Feb 6, 2014

This simple 220V power interface is intended as an interface for monitoring electric equipments and devices using a computer. The interface only senses whether the device being monitored is turned on or off. The most important aspect of the circuit is the galvanic isolation between the AC main line being monitored and the interface to the computer


220V Power Line Interface
Click here to download the full size of the above Circuit.

. This is done with the use of the optocoupler IC TIL111 but a suitable replacement can be used too. To avoid having to modify the circuit for each device being monitored, the circuit monitors the device`s AC power line directly. The resistor R1 lets a current of around 0. 5 mA through the optocoupler LED. The other half of the current is rectified through the diode D1. It is obvious that the current to the optocoupler LED is half wave rectified. This means that the phototransistor part of the optocoupler receives only light impulses of around 100uA. The capacitor C1 filters out the current pulsation and maintains a smooth output current. In case the current pulsation is needed, just remove C1.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

14 Watt Audio Amplifier
VHF preamplifier with BFY91
Tactile sensors Motor controller
Video amplifier and video detector
Pulse Generator With Variable Duty Cycle Circuit
170w audio power amplifier
Simple Cat.5 Network Tester
Circuit Diagram of Mobile Jammer
Dash Instrument Testing
Instrument panel lamp dimmer control Circuit



Top