High Voltage Protection

[saumya_85]

I Want to have the high voltage input protection( 285~300 Vac) for my design. Can anyone help me?

 

[Tahmid]

Hi,
This is what I use in my inverter. Use this as the sense section. When input is > 285V, SIGNAL OUT > appr. 4V
You can use a comparator to compare this against a 4V reference or you can use a microcontroller to do this.
Then you can drive a relay to switch the load off.

Hope this helps.
Tahmid.

 

[saumya_85]

Thanks for the reply.
Could you let me know the voltage of C1 Capacitor and also suggest comparator circuit.

 

[Tahmid]

Hi,
The voltage depends on your max input voltage. A safe voltage would be 600V.
Hi, try this, I think it will help you.

Hope this helps.
Tahmid.

 

[saumya_85]

Thank you Tahmid for the support.