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Wide Range Variable output voltage (1~200) isolated DC/DC convertor

Hossein Davoodi
Prodigy 10 points

I am going convert 24v DC to an controlled output varying from 1 to 200v DC with 100mA current.

To separate my output from input also I need isolation between them.

It seems by controlling feedback voltage I can adjust output voltage but question is that possible to control it in my wide range or not?

In next stage I need to convert this output voltage to Sinewave signal with frequency range of 1 to 200 Hz.

In first look I need to circuits but I am thinking to control both frequency and amplitude of output with a single stage power management IC.

Is is possible to have this circuit practically and how?

  • 0
    TI__Mastermind 31580 points
    Hi Hossein,

    This is outside our normal application range. To generate the 200V to 1V output I would suggest that you design an isolated flyback to genearte say 210Vdc from 24V input. Then run a buck stage from the 210V output of the flyback. The 1V output will be challenging as the duty cycle will be very low, down to 0.5% which will make it very challenging from a load regulation perspective.

    I suggest you look at existing solutions in this applcation area to get an idea on how others have solve the problem. You can use a class D type amplifier circuit to converte the dc voltage to a sine wave but your frequency range is very low, down to 1Hz, which will make the passive filter elemnts physically large.

    Regards

    Peter