Cascaded Boost converter for high step up ratio?

Discussion in 'The Projects Forum' started by Hero11, Feb 23, 2014.

  1. Hero11

    Thread Starter New Member

    Feb 23, 2014
    2
    0
    Hi everybody

    I need to build a Boost circuit to drive some LEDs. I need a high output voltage as compared to the input voltage, but I read it is not practical to design a boost converter with a Vo/Vin ratio greater than 6, while I need a ratio close to 10. Some books say to design in DCM if this is the case. To stay in CCM and obtain the high voltage output, is it realistic to cascade two boost converters? If so, are there controllers that would control both switches or would I need two separate controllers?

    Thanks in advance for any advice.
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    You might try specifying:

    VIn

    VOUT

    I load

    and I can recommend a ps design.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,050
    3,244
    You might consider a fly-back switching converter. They use a transformer to generate a voltage increase as high as you need as determined by the turns-ratio.
     
  4. Hero11

    Thread Starter New Member

    Feb 23, 2014
    2
    0
    Is this design preferred for high Vo/Vin ratios? Also, what is the reason a regular boost can't handle the high ratio, is it because it would require a very large duty cycle?
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,050
    3,244
    Yes and Yes.
     
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