Most Efficient Way of getting 100v + 100v from 8 volts

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Gandalf_Sr

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Please help me by suggesting the best (most efficient) topology for my design. I'm hoping for 70%+ efficiency.

I need to generate +100v and -100v from a single 8v battery. Max load on the 100v rails will be 180 mA pulsed and 5 mA average.

I have considered a boost and buck-boost for the +100 -100 respectively but I wonder if a transformer would be more efficient?

If I did have a transformer, I could use a switch controller to drive the primary and have 2 secondaries. What would be a good frequency to switch at and why?

Thanks in advance.
 

Hi,
I think push-pull topology at 50kHz with a ferrite transformer would be a good thing. You could drive using an SG3525, have 2 secondaries with 2 external ultrafast diode bridges and filter capacitors. If you need tight regulation, apply opto-TL431 feedback. You can easily expect above 70% efficiency.

But, seeing as to how your output requirement is not very high, a transformless design wouldn't be bad.

Hope this helps.
Tahmid.
 

you can use flyback , this topology is very simply , be suit for your outputs that is small power supply of a high voltage and small current ,if you design your transformer in heart ,you can find the efficiency up to 80% is so easy.
you may use the RCD snubber for your transformer leakage energy.use a slowly recovery diode for the D of RCD snubber , you can find the efficicency can up one percent .
 


Just see the Topic, It might help



Regards
 

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