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For designing 50v,100v,150v dc power supply.

Discussion in 'Power Electronics' started by shibas, Apr 9, 2013.

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  1. shibas

    shibas

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    Feb 13, 2013
    How to design 50v,100v,150v power supplies?I need to use these power supplies for an actuator(Piezo stack actuator).

    Can any body help me with the design equations for the above mentioned power supplies along with their circuit diagrams and necessary materials or notes for designing the power supply?
     
  2. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    What is a Piezo stack actuator?

    Please give details of the supply required. Is this DC or AC and if AC, what frequency? What power/current is required?
     
  3. shibas

    shibas

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    0
    Feb 13, 2013
    Last edited: Apr 9, 2013
  4. duke37

    duke37

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    Jan 9, 2011
    As I understand it, the actuator is a 0.6uF capacitor without a DC load. It depends on how quickly you need to change the voltage.

    You could make a 200V power supply and feed the actuator through a resistor which is shunted to ground with a transitor to give the voltage required.

    An alternative would be to get a 12V 'wall wart' and use a boost convertor.

    A portion of the output voltage would be taken to decide the amount of drive to the output.

    How will you set the required voltage, a multiway switch?

    I have replied fast, why do you request this? You will need several days to make a supply and I will need some time to mull over a circuit which I will do when digging the garden.
     
  5. duke37

    duke37

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    Jan 9, 2011
    I have found a simple circuit using the 555 chip.
    It is from dos4ever.com. It does not seem to have very good output voltage control.
    You may be better to get a built one.
     

    Attached Files:

  6. shibas

    shibas

    14
    0
    Feb 13, 2013
    I think we can design these dc power supplies using a transformer,a bridge rectifier and a capacitor.

    But what should be the different voltage and current ratings of the transformer for designing the 50v,100v,150v dc power supplies?

    What should be the value and voltage rating of the capacitor?

    Can u help me by providing either the circuit diagrams of the power supply design using the transformer,bridge rectifier and capacitor for the 3 different dc power supplies of 50v,100v and 150v or by providing the links for getting the necessary materials,ciruit diagrams,equations for designing the 3 dc power supplies of 50v,100v and 150v.
     
  7. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    If you do not need accuracy of the voltage, you can get away without stabilising the output.

    Here is a circuit using a 36V-0-36V transformer which I think may work. You may get to within 10%.

    Capacitors could be 10uF, 100V
    Diodes could be 1N4007
    I think the current drain is negligible

    It rectifies the outputs of the transformer in opposite directions and adds a voltage doubler from the center tap to get the extra 50V.
     

    Attached Files:

  8. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    Just a few musings about this topic:

    The first thought that crossed my mind was how could I employ this technology in my machine shop work. Sadly I can't think of any but at mere 10 microns displacement I don't think I'll ever be able to produce a part with tolerances that tight anyway.

    My second thought involves the purpose of this project. Statements made by shibas leads me to believe this is a class assignment. It has the classic paraphrase "I need this fast" in his second post. The second dead giveaway is found in his third post ..
    This reprises a dilemma that we often have... How much information do we divulge without actually doing the student's home work for them? After all, when I was teaching I did give credit for the ability to research.

    Number 3 on the musing chart are the power supplies. Without actually doing your home work for you here are some thoughts that you can expand on. When vacuum tubes ruled the roost it was common to find HV resistive voltage dividers.used where very little current was required from the node being tapped. Since this Stack Piezo is primarily capacitive I see no reason why a low current 3 tap voltage divider wouldn't work.

    Here's a cheap way of making a 1:1 isolation transformer (Macro) that can be safely connected to the mains. Though 240VAC to 12VAC transformers are indicated they can be 120VAC to 12VAC as well. At 120VAC input it will output about 169VDC when filtered. This is more than enough to feed the voltage divider I described.

    For those of us that are nostalgic for most things old I still own this Heathkit since sometime in the late 60s or early 70s. The Cap/Leakage test has a range of 3VDC to 600VDC, which is facilitated by resistive voltage divider connected to the rotary switch on the middle right side of the instrument.

    http://www.ebay.com/itm/NICE-VINTAG...ultDomain_0&hash=item589e48ff0f#ht_2373wt_679

    Chris

    [​IMG]
     
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