Do we need a PFC frontend for SMPS that draws 30W ?

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eem2am

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We are in Maryland and we have an SMPS which is rated at 60W, and therefore it has a PFC front end.

However, the 60W output only occurs for one second when 4 solonoids are operated.

-after that, the power draw never goes above 30W.

Its in a shower unit so the (normally-closed) solonoids only get activated once per day, per person, typically.
-after being activated, the solonoids draw the low level holding current.

-so should we really need the PFC stage?
 

Re: PFC for SMPS?

None of the computers made in China have PFC in their power sources; I have tested 10+ noname computers, some older than others. And PSU is rated between 250..400W.
None of the power supply for LCD (even branded ones) have PFC!!!
The same with most notebooks.
So I would say: no, the PFC is not really needed.
 

Re: PFC for SMPS?

No, you don't have to have a PFC front end. One of my designs is a 200W motor drive that meets all CE requirements without a PFC front end. It did require a relatively large line reactor to meet some of the requirements though.
 

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