Stepping up a DC voltage.

[junguo93]

I only learnt of AC-AC stepping up, i am just wondering if there is a possibility for a DC-DC Stepping up, for about a 4V to a 300V. If it is possible please help me out with this..

I was wondering if it is about converting DC-AC stepping up AC-DC, though the use of inverters. I am also wondering if it is the only way.

[sophiecentaur]

One way or another, if you want to produce a higher DC voltage than the DC one you've got already, you have to vary current in some way so that you can then induce a higher voltage, using an inductor of some kind.
This can be achieved without explicitly using a transformer (an appropriate circuit with just an inductor can work) and it is often achieved using much higher frequencies than the Mains. There are hundreds of alternative circuit designs but they all have the common basic features of an oscillator and an inductor.

[junguo93]

Thanks for the Reply, but how do we vary the current, since i am actually producing the 4V with a Photovoltaic Cell, which i do not think is capable of a good range of currents?

[sophiecentaur]

Obviously, if you step up the voltage by nearly 100 times, you will end up needing 100 times the current from your low voltage cell. VA is the name of the game.