Otherwise there is an armada of different possibilities, as Chatelot16 recalls, from the simplistic to the complicated, just enough to learn the basics of electronics, and this remains much infinitely simpler, than the smartphone, designed in the West and manufactured in Asia, with miserable wages, with, at the start, the simple law of induction followed by Maxwell's equations between the years 1830 and 1865:
it's very simple, a coil and a switch at 30KHertz, which is childish at 1 Hertz with a manual switch, which from a battery of 4,5V makes you 1000V with a self of 1 henry (secondary transformer 220V ordinary low power) and which makes it possible to make its children feel the feeling of the electric current, but without danger, and which can be used as a defribillator in emergency, better than nothing at all by seeing die to resynchronize the heart:
http://fr.wikipedia.org/wiki/Alimentati ... %A9coupage
http://en.wikipedia.org/wiki/Switched-mode_power_supply
http://fr.wikipedia.org/wiki/Convertisseur_Buck-Boost
http://en.wikipedia.org/wiki/Buck%E2%80 ... _converter
http://en.wikipedia.org/wiki/Boost_converter
http://fr.wikipedia.org/wiki/Convertisseur_Boost
http://sitelec.org/cours/abati/decoup.htm
http://fr.wikipedia.org/wiki/Convertisseur_Buck
http://en.wikipedia.org/wiki/Buck_converter
It is necessary to separate the DC voltage change and the generation of the 50Hertz AC synchronized with the mains with the safety devices.
read it carefully with the links in it:
http://en.wikipedia.org/wiki/Grid-tie_inverter
http://en.wikipedia.org/wiki/Maximum_po ... nt_tracker
http://en.wikipedia.org/wiki/Inverter_%28electrical%29
a simple example with 555 and drivers without security:
http://www.electro-tech-online.com/alte ... matic.html
http://www.electro-tech-online.com/atta ... rter-2.png
correcting some errors as explained.
Otherwise the Asia are as intelligent as us, if trained in the West, measured by their number of Nobel Prize winners of Asian origin !!
Also, even hiding the secrets, no hope, except to create faster than them, held back at home by their culture, their language, their customs.
They copy what they admire, quite often stupidly (example Chinese DSP!).