I would like to build a pure sinewave inverter and need some help in designing & component selection.
What ? A 100-200 Watts, 230 V pure sinewave inverter Input: preferably one 12V SMF battery. two if absolutely needed. Output: 230V RMS sinewave capable of 100 ~ 200 watts Load: 19" LCD TV for now.
Constraints: Design should be simple as this is my first hi-wattage supply. Would like to use standard off-the-shelf transformer and other component.(as i have no experience designing transformers) Should be very fault tolerant (overload/SC etc) and safe to use as i am the one who will use it.
Why ? Primarily for learning.Yes, i know building one may cost more than buying. Yes i also know that lethal voltages will be present.
What i can: i am an electronics hobbyist and design digital ckts regularly, but have not embarked on a high wattage power supply before. Have the standard tools like DMM/DSO and use LTSpice, gEDA and such tools. Have designed and programmed PIC18F micros.
My proposed block diagram:
12/24V --> [ DC-DC boost converter] --> 320 VDC --> [ 100 KHz PWM/H- bridge ] --> [ Filter ] --> 230V RMS sinewave.What help i need: Topology: How to get the 325V peak DC in the first place ? does it require multiple boost stages ? Transformer: I guess a transformer would invariably be needed. how to select one (off the shelf one) ? Snubber: How do i go about design a snubber ?
Any answers or even pointers to above questions would be much appreciated.. Thanks