Couple of basic questions regarding power supplies

Jun 01, 2005 3 Replies
M

Hi - I'm going to be using a Bias Power BPS-200-2-14-50:

formatting link
in an upcoming project. I have a couple very simple questions though:



It has an "EM" pin, and for it's description it just says "see emi app note". This app note is no longer available. I did find an archived version of the website that refers to the EM pin here:

formatting link
it says "for connection of external Y capacitors to reduce EMI in certain applications". Can somebody tell me what Y capacitors are? Or if this is even needed?



Also - this power supply will be powering an RF circuit. I am wondering - should I connect earth ground to the ground pin on the power supply? I'm very unsure about this, and figure it's most safe to ask first.



Thanks,


-Michael J. Noone


Vote
Twitter Facebook LinkedIn
J

From: http://www.savoy-hill.co.uk/sales.htm#X%20&%20Y%20rated%20capacitors "X & Y rated capacitors These capacitors are specially designed for connecting directly to the mains. Class "X" capacitors are designed for connection directly across the mains supply there are two sub classes used "X1" rated units are for heavy duty applications and are made to withstand 4K Volt peak pulses. "X2" are designed for general use and can withstand 2K Volt peaks. "Y" rated capacitors are designed for connection between a current carrying conductor & earth. They are designed not to pose a threat of electric shock in the event of failure."
Vote
Twitter Facebook LinkedIn
M

i came across some references about capacitors for power supply,it just might help you and it just might answer your questions try to click to this links

formatting link
formatting link
formatting link
formatting link
i hope that it will help you,it sure helped me.

Vote
Twitter Facebook LinkedIn
M

John Fields wrote in news: snipped-for-privacy@4ax.com:

Hi Mr. Fields - Just to clarify - do you think that they are saying to connect a Y capacitor between the EM pin and earth ground? Also - in what sorts of situations is this needed? This device will be running inside off of wall power - would such a capacitor be needed? I'm thinking probabaly not, but I thought it best to ask to be sure.

Thanks,

Michael

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required