Power Source switch IC

[vamanan]

Hi All,
I have two 220V power sources. I want to power my device with this. If One power goes off , the device need to switch to the other 220V source. Is there any IC's to do this?. Help me regarding this.

 

[dick_freebird]

Would an IC (if such existed) be any better than a plain
old 220VAC DPDT relay? The only reason I could see, is
if coil current were a significant fraction of load current.

 

[FvM]

Switching an AC source generally introduces a short gap, with any switch type. It strongly depends on the supplied equipment, if it continues operation seamlessly.

Contactors can be expected to operate break-before-make, but you also have to assure, that a possible break contact arc is extinguished before make of the new connection, otherwise a short is generated. At delay of at least a half cycle is required for it. This implies, that a regular double throw contactor can't guarantee save operation. Usually two separate N.O. contactors with a locking mechanics and a time relay are used for switching AC sources.