Mains Transient Supression

[Simon]

Hello

I'm looking for some help with Mains transient suppression for an electronic
device consuming about 20W. The device is operated in a heavy industrial
environment.

I have spent hours and hours trolling the net looking for typical examples
of robust transient supression for 230vac mains supply.
I see snippets of circuits with MOVs and Gas Distarge Tubes but I am
confused and I can find no typical values for an industrial environment.

Can anyone help. All suggestions will be greatly appreciated.

Regards
Simon

 

[Phil Allison]

"Simon"

I'm looking for some help with Mains transient suppression for an
electronic device consuming about 20W. The device is operated in a heavy
industrial environment.

** Depends entirely on the specifics of the device.

Does the device already exist or is it being designed ??

I have spent hours and hours trolling the net looking for typical examples
of robust transient supression for 230vac mains supply.

** Most electronic devices are protected from AC supply spikes merely by
having a bridge rectifier and filter electro at the PSU input or after a
transformer.

This arrangement inherently clips incoming spikes to the voltage level of
the filter cap - something no MOV across the AC can achieve.




......... Phil

 

[Homer J Simpson]

I'm looking for some help with Mains transient suppression for an
electronic device consuming about 20W. The device is operated in a heavy
industrial environment.

I have spent hours and hours trolling the net looking for typical examples
of robust transient supression for 230vac mains supply.

Use a 230 VAC isolating power transformer. Use very well rated components
with plenty of voltage margin. A mains filter block will probably prove
useful. Consider how you ground your device.

I would be more concerned with inputs and outputs - I assume the device
doesn't run without some sort of sensors or outputs?

 

[Ross Herbert]

Hello

I'm looking for some help with Mains transient suppression for an electronic
device consuming about 20W. The device is operated in a heavy industrial
environment.

I have spent hours and hours trolling the net looking for typical examples
of robust transient supression for 230vac mains supply.
I see snippets of circuits with MOVs and Gas Distarge Tubes but I am
confused and I can find no typical values for an industrial environment.

Can anyone help. All suggestions will be greatly appreciated.

Regards
Simon

Are you actually experiencing any problems with this device at the
moment or are you anticipating that you will be? If you are currently
experiencing problems it would be helpful if you could describe the
type of problems you are having since the solution will depend to some
extent on this information.

 

[A.J. Kool]

Hello Simon,

If possible, place the MOV at the secundary side of the transformer.
The size of the MOV (the power it can handle) determines the level
of protection.
Note that the voltage across the MOV will still rise significantly, so
the rest of the circuit must be capable of withstanding that.
Look at the max voltage the rectifier bridge can handle.

 

[Phil Allison]

"A.J. Kool"

If possible, place the MOV at the secundary side of the transformer.

** Whaaaaaaat ??????

Note that the voltage across the MOV will still rise significantly, so
the rest of the circuit must be capable of withstanding that.
Look at the max voltage the rectifier bridge can handle.

** Complete BOLLOCKS !!

Mr Kool is a red HOT idiot.





......... Phil

 

[John Fields]

Hello

I'm looking for some help with Mains transient suppression for an electronic
device consuming about 20W. The device is operated in a heavy industrial
environment.

I have spent hours and hours trolling the net looking for typical examples
of robust transient supression for 230vac mains supply.
I see snippets of circuits with MOVs and Gas Distarge Tubes but I am
confused and I can find no typical values for an industrial environment.

Can anyone help. All suggestions will be greatly appreciated.