Hi every one,

This is my first post here and sure not the last . Im now on third year university and Im planning to build a DC-DC converter with solar cell charger as a Vi for the converter. I did my resarch about solar cell and sadly I find it dificult to draw a circuit that make the solar cell as a power supply for my converter . I want any body to help me and give the advise how to do it and if any one have circuit ( scmh ) for the converter with the solar I will be thankfull.

If it not possible can any one give me the circuit for the DC-DC converter at first and later I will find the soultion for the solar . I looked for a circuit on the internet and most of them was simple and not good enough for a third year university . I know there an expert here and maybe they will lough on me for my question but instead of lughing can they help me and I will be thanckfull .


Finaly sorry for my english if it is not clear

Thanks

 

Is it so hard

 

There are as many DC to Dc converter circuits as there are different Dc voltage levels in use in the world.

We need a little more info to help you. What voltage do you have and what voltage would you like to change it to. How many amps of current are you needing?

There are several IC chips that are made just for DC/Dc conversion and need very few external components to complete. If you need large amperage currents then the circuit will get more complex and hard to build.

 

You English is clear enough. We do need the specifications on the solar cell, though, as well as the voltage and current the DC - DC converter should be able to provide.

 

There's a current thread on a DC/DC buck converter, run from a solar panel, here:
http://forum.allaboutcircuits.com/showthread.php?t=44277

 

Thanks foy your replays

Im planning to do 12V to 48 DC-DC Converter like this one on youtube

http://www.youtube.com/watch?v=oXulSFItvk0

I will think about the solar cell later.

can anyone give me any advise

 

Also what you think about this circuit on page 5

http://www.intersil.com/data/an/an1101.pdf

Do you think it will be usefull and is it possible later to add a solar cell to be power supply ( Vi )

waiting your replays experts ^_^

 

So long as you understand that solar cells are mainly used to charge batteries which are later called upon to generate some extra power. Solar cells alone don't put out enough power to effectively operate anything but very small devices directly - unless of course you've got an entire field full of them.

 

^
^

Thanck you for your replay

ok what you thinck about this circuit on page 5

http://www.intersil.com/data/an/an1101.pdf


do you think it is useful ?

 

If you will be charging 12v sealed lead-acid batteries (SLA) then you will need approximately 14v to 14.5v per battery in series during the bulk charge phase, and 13.65v per battery for the float charge phase.

If you have 4 batteries in series, then you will need four times those voltages.

Boosting 12v to 56v-58v means that you will need roughly 5x the current at 12v than you will get out at 56v-58v; and this does not include losses due to the efficiency (or lack thereof) of the power converter. 92% efficiency is about the best you could hope for. 85% is more likely, if you are very careful in your design.

Without knowing what your battery specifications and solar cell specifications are, it would just be a waste of time trying to come up with a circuit for you.