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23rd February 2013, 09:43 PM
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#1 |
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diyAudio Member
Join Date: Feb 2011
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Is there any thing wrong with this design
Dear All,
I have a question with this design for PS The input is 320 V AC and the out put is 400V DC I am wondering why Resistor #5 (68K 3W) always very hot? Can some one give me some clue? tks |
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23rd February 2013, 09:58 PM
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#2 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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what is the dissipation of that Resistor #5 (68K 3W)? in my case, i use that 3 watt to dissipate less than 1 watt...
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http://www.elab.ph/forum/index.php?topic=32688.0 |
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23rd February 2013, 10:18 PM
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#3 |
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diyAudio Member
Join Date: Apr 2011
Location: Right behind you.
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Does it actually work at all? I really don't see how you could subject an LM317 to these voltages. How could you send AC straight through a 10mH inductor? What happens if you put 100uF straight over AC? Where does the DC come from? Etc.
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Second law is your friend. Last edited by vacuphile; 23rd February 2013 at 10:25 PM. |
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23rd February 2013, 10:27 PM
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#4 |
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diyAudio Member
Join Date: Nov 2005
Location: San Antonio
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That was my initial thought, too, vac. But he has a rectifier box there on the AC input. I don't understand the zener bypass, or the pot wiper to nowhere, or...
so best for me to leave it alone. 
__________________
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine |
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23rd February 2013, 10:35 PM
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#6 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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the zener could be a 27volt one, together with the mje13005 ensures that the vin-vout rating of the lm317 is never exceeded....
__________________
http://www.elab.ph/forum/index.php?topic=32688.0 |
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23rd February 2013, 10:43 PM
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#8 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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welcome, the circuit reminds me of the maida regulator....21st Century Maida Regulator
__________________
http://www.elab.ph/forum/index.php?topic=32688.0 |
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23rd February 2013, 10:49 PM
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#9 | |
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diyAudio Member
Join Date: Apr 2011
Location: Right behind you.
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Quote:
__________________
Second law is your friend. |
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23rd February 2013, 11:41 PM
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#10 |
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diyAudio Member
Join Date: Jul 2002
Location: San Diego
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LM 317 adjust pin is 1.25 V below output V. R5 dissipates about 2.35 W = (400-1.25)^2/68000.
The 5k pot is much too large. For 400 V out you need about 213 Ohms there, so you will be using only 4% of the pot, voltage adjustment will be way too sensitive. |
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