230VAC to 600VDC help please

Discussion in 'The Projects Forum' started by Hurdy, Oct 28, 2006.

  1. Hurdy

    Thread Starter Senior Member

    Feb 27, 2006
    137
    0
    Hi everyone,

    I am looking to make a device that will convert 230VAC to 600VDC that only has an output current of around 1mA ish.

    Can anyone advise me on how to convert my AC to DC then boost the voltage to 600V and limit the current to 1mA.

    Thank you for your time,

    Rob
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,912
    1,724
    You will have a much easier time using a transformer to convert the 230VAC to a higher AC voltage. Then a rectifier and a high voltage capacitor should do the the job. That's how I always made a B+ supply for plate voltage.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    Enough people are using vacuum tubes that some suppliers have B+ transformers available. Look for something that puts out about 420 VAC.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Current limiting will be the challenging part. What variation of load impedence do you forsee?
     
  5. terrytapp

    Member

    Mar 30, 2006
    15
    0
    DC restorer? (let me know if this is the wrong answer)

    Terry
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    DC restorer? That's a circuit used to restore a signal level after passing through a coupling capacitor. They aren't much in demand since vacuum tubes lost out to transistors.
     
  7. terrytapp

    Member

    Mar 30, 2006
    15
    0
    *smiles*
    OK! OK! OK!
    I will leave the answering of questions to the pros. :rolleyes: ;)
     
  8. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
  9. wireaddict

    Senior Member

    Nov 1, 2006
    133
    0
    Hi All,

    I just registered today so this is my first post here. Another way to increase 240 VAC to "about" 600 VDC is to get an industrial control transformer with dual promary and secondary windings; the low voltage windings can be connected for 120 or 240 VAC [in series] and the high voltage windings for 240 or 480 VAC [also in series]. Connect the 480 VAC output to either a diode bridge, or a full-wave diode setup with a filter cap, using the center connection as the output common. The output voltage from this will be about 678 VDC if that's acceptable.

    Because of your low current requirement you should look for about a 50 VA transformer or smaller to save money. Also, due to the high PIV on the diodes in a full-wave arrangement, use diodes rated at 1.5 KV PIV. Hope this helps.

    Dave
     
  10. EngineerJoe

    Member

    Nov 4, 2006
    15
    0
    Have you tried a voltage doubler circuit? It looks a bit like a full wave bridge rectifier with an extra capacitor and diode. No additional transformers are required, but the output will be a multiple of the half wave magnitude.

    For limiting the current, you might try searching for "current limiting diodes" on Gooogle.
     
  11. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
  12. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
    Is there a current diode that can actually handle 230VAC or 600VDC?
     
Loading...