AC/DC anatomy identification

GreenGiant

Feb 9, 2012
842
Joined
Feb 9, 2012
Messages
842
Ok so here we go....

Slide 1: That is a "Ferrite Bead/Ring" it is used to filter out high frequency noise coming from the wall, or things coming from the charger, nothing overly special there. (P.S. a ferrule is something that you crimp onto the end of a stranded wire to raise the current rating/make it a little stronger)

Slide 2: Without looking at it more closely I would assume that it is probably just a shield measure to keep noise out/in, it is probably grounded.

Slide 3: That "guu" is just to keep the parts in place, it sometimes has thermal properties to increase the surface area and help move heat, but I would suspect its just for holding everything in place. (P.S. the "bobbin/coil" is a copper wire wrapped around a ferrous core (probably plain iron) for filtering and things)

Slide 4: I'm not entirely sure what that component is, but it des have a clear .33uF mark on it, which is a capacitive value, but being that large and with the "MH" that would lead me to believe it is a coil (inductor), which would have a small capacitive value.

Slide 5: That appears to be a fuse of some kind, though a package that I am not familiar with, maybe a ceramic fuse? Either way it is a 250V rated 2.5A fuse, most likely fast acting. Rubber cap may have been on there to protect from heat, or just to cover it.

Slide 6: That "bobbin/coil" looks like a transformer, though I can only make out 2 leads from it, but yes that is where the voltage gets knocked down to somewhere close to what it needs to be.

Slide 7: That plate is there most likely to prevent the coil from causing noise on the shield next to it, that's my best guess.
 

davenn

Moderator
Sep 5, 2009
14,470
Joined
Sep 5, 2009
Messages
14,470
Green giant got them all mostly right :)

4) is a mains voltage 0.33 uF cap it might have a resistor in series with it
inside the package ... this is common with those devices.... you have damaged the left side of the cap where the markings are so cannot read the first part on the line prior to the 0.33uF

7) is a shield and primarily heatsink on one end the bridge rectifier and on the other end, the switching transistor

NOTE this is a SMPS switch mode power supply

Dave
 
Top