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Switch mode power supplies

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2005-2006 » Archive through 20 July, 2006 » Switch mode power supplies « Previous Next »

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Altaf
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Username: Altaf

Post Number: 1
Registered: 11-2005

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Posted on Friday, 14 July, 2006 - 12:25 pm:   Edit Post Delete Post Print Post

Hi, i am new to this forum and i wanted to know more about switch mode power supplies(swps), my question is after reading an article on swps in the july issue of epe is are the switching trnasistors in someway connected to the storage capacitors, and it is the tl494 chip which switches the transistiors on and off and finally from the switching transistors the current goes to the primary transformer is this setup similar to most swps
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Obiwan
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Username: Obiwan

Post Number: 583
Registered: 12-2005

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Posted on Saturday, 15 July, 2006 - 12:16 am:   Edit Post Delete Post Print Post

Sorry to say, but that's a bit hard to understand for me.

Normally, no, the output switching transistors are not connected to the filter caps. Not on the output anyway. They may indeed been connected to the input filter caps.

Generally, with a SMPS, you take the AC, and filter it down to DC again. Then you basically make an inverter with the transistors/transformer. And filter that output just as you would with any power supply.
Do Not Hit The Fly That Lands On The Tigers Head.
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Vk3kbr
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Username: Vk3kbr

Post Number: 97
Registered: 08-2005

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Posted on Saturday, 15 July, 2006 - 10:48 am:   Edit Post Delete Post Print Post

G'day Altaf,
I have paperwork here for the repair of the small S.M.P.S. I was going to post it here, when I revisited the thing, it was much too big.
Send me your E-Mail address and I will forward it to you.

Regards, Rod vk3kbr. (look in my details list for my e-mail address).
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Dean_huster
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Username: Dean_huster

Post Number: 156
Registered: 05-2005

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Posted on Tuesday, 18 July, 2006 - 12:38 pm:   Edit Post Delete Post Print Post

Here's a web site posting by Sam Goldwasser on the repair of switchers:

http://www.repairfaq.org/sam/smpsfaq.htm

Dean

(Message edited by dean_huster on 18 July, 2006)
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Vk3kbr
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Username: Vk3kbr

Post Number: 99
Registered: 08-2005

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Posted on Wednesday, 19 July, 2006 - 04:26 am:   Edit Post Delete Post Print Post

G'day Dean huster,
yep, that's the one I had. I forwarded it to Altaf.

Regards vk3kbr

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