Integrated solid state relay


Posted on Sep 5, 2012

A complete zero-voltage switch solid-state relay contains an input circuit, an output circuit, and the power thyristor. The circuit illustrates a triac power thyristor with snubber circuit and GE-MOVRII Vans tor transient over-voltage protection. The 22 ohm resistor shunts di/dt currents, passing through the bridge diode capacitances, from the triac gate, while the 100 ohm resistor limits surge and gate currents to safe levels. Although the circuits illustrated are for 120-V rms operation, relays that operate on 220 V require higher voltage ratings on the MOV, rectifier diodes, triac, and pilot SCR.


Integrated solid state relay
Click here to download the full size of the above Circuit.

The voltage divider that senses zero crossing must also be selected to minimize power dissipation in the transistor optisolator circuit for 220-V operation.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Crystal display (LCD) tester
High-frequency crystal oscillator
Simple Delay Timer Circuit
Magnetic Field Meter Magnetometer Circuit
Low Voltage Microphone Preamplifier Circuit
Electronic Door Release
slave flash trigger
Multifunction adjustable universal time relay (NE555, CD4013) circuit
Thermocouple cold junction compensator AD594 595 centigrade thermometer circuit diagram



Top