his article is my workbench 'Notepad' as i learn and build a buck bost inverter for low voltage from peltier elements seeberg effect (thermoelectric elements) and solarcells.
Both power sources give very low voltage: solarcells typical 0,5 volt and peltier elements 0,5 - 1-2 volts.
My goal is to charge directly on a standard acid battery, both 6 volt and 12 volt.
Latter i will add a Li Ion / LiPo single cell charger and a charger on mulitible Li cells cells
I've saved some defective PC computer power supplies for spare parts, they have quality great coils and more.
I believe i can find all parts needed on these pcb's to build my buck boost chargers
Chips found on deffective boards:
- uc3844 Current-Mode PWM Controller
- uc3842an High Performance Current Mode Controller
- 2 pcs top210pfi Off-line PWM Switch
- Ka7552 pwm controller
I believe the top210pfi is the best choose because it has a build in MOSFET, that means less components in the final buck boost circuit.
But first i might need to make a LC meter to measure coils Henry value.
nice and easy inductimeter project, i choose to build this one
Building the Inductimeter
Links and ressources about buck boost:
u3842 baseret + fet: http://www.freewebs.com/acselectronics/12_24reg.html
transistor baseret, ingen trafo:
fet baseret, ingen trafo: http://myweb.msoe.edu/williamstm/Images/Discrete_Boost.png
om sw mode suplyes: http://www.smps.us/power-supply.html