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

555 How can I make a 15 minute egg timer circuit
A user friendly boost DC DC converter topology
audio visual indicator for telephone circuit diagram
Joulethief SEC exciter and variants 64
40W Fluorescent Lamp Inverter
1984 F-350: crew cab My fuel gage switch in the dash
ds1820 interfacing with avr primer
PJRC MP3 Player Pushbutton Circuit Board
Mini AV Test Box Circuit
40 m Band Superhet Receiver
LA5522 Application Circuit