boost converter using zero voltage switching ZVS

Discussion in 'The Projects Forum' started by dark night, Feb 5, 2012.

  1. dark night

    Thread Starter New Member

    Jan 20, 2012
    5
    0
    i am designing a boost converter using zero voltage switching technique, here its the parameter:
    Vin = 5v
    Vo = 12v
    and other elements as shown in schematic below;

    my question is when supplying a 5v to the input, the output will not equal to 12v
    it will be approximately = 10.963v

    also am using (DIODE_VIRTUAL) so i don't know what is the diode should be used , because am going to build hardware so i need to specify the value of the diode.

    any on give a suggestion about it,
    thanks.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    That circuit has no feedback to regulate the output voltage. It is thus determined by the connected load and the duty-cycle of the 555 driver.
     
  3. dark night

    Thread Starter New Member

    Jan 20, 2012
    5
    0
    the frequency is constant its about 100kHZ and the duty cycle is 58%, ton= 5.83μs-----toff=4.16μs, so the output should be 12v or at least 11.5,

    and am not sure about the size of the inductor.Perhaps is the reason why i didn't get accurate value of the output
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    The output voltage of a buck circuit is approximately determined by the duty-cycle over a range of loads, but not a boost circuit. The output voltage of a boost circuit depends upon both the duty-cycle and the load.
     
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