dc to ac inverter schematic 1000w
I try to address some of your isues-- even if my experience is of systems of very much lower effect levels than you seem to need.
First of all, be aware that Watts are not VotAmps. You have to consider the VAs when calculating the system. Of course, modern equipment do not have as bad cos-phi figure as it was only a few years ago, thanks to approval requirements.
You should not forget the old good Google search, with relevant keywords. There are much material out in the net!
1) * what power output should i target?
You have to research the VA figures of those devices. And also consider the startup situation. Best way is to use both the name plate figures and make some measurments as well.
2) * what is the best dc Voltage i should use? i have an option of 24Vdc and 48Vdc
The desicion here is mainly depending on a few factors:
- Smaller voltage means higher currents, and potentially more ohmic losses.
- Higher voltage needs high voltage transistors and other components.
I would start investigating 48 V and moderate frequency (25-50 kHz or thereabout, maybe somewhat more if the components perform well on frequencies) as a starting point.
3) * What kind of oscillator will be more adviceable; pwm, winebridge, cristal sine wave, square wave, pulse etc?
In my opinion. selection of oscillator is not the most critical task in the beginning. Your need will be affected on the selected converter topography, and you should start there.
4) * has anyone done a project at this level could he share his experiences with me?
Sorry, not me. Have worked on much smaller constructions....
5) * which EDA programm is best for simulating this kind of ccts? i've tried simpler ones with P*otel and it's actually a mess
I think there is no general purpose simulator for designs of this kind, partially because the component models are insufficient, partially because the discontinuous environment (switching!), and dependency on usually very secondary parameters.
6) * or does anyone have an already design circuit for this spec. and is willing to share?
* any website for in formation/circuits on this level of project?
-Look around in the net, too!
7) * between FET abd BJTs which one is preferable and why?
- More research at Internet and at component producer's web sites might help....
8 ) * what kind of transformer design is best for this? (details if any)
- The transformer will be a very "hand-made" device. I would consider large E cores as the first approach, they are available with plenty sizes.
9) * what really determine the output power; xformer or power transistor
- Both! The design is an entity, all parts count.
10) * what is the effect of frequency on the output power
Frequency <20 kHz leads easily to audible noise and should be avoided.
Magnetics get smaller with higher frequency, but demands for transistors increase and switching losses are more consern on higher frequencies.
My gut feeling is 25-50 kHz as the starting point. Be aware that any ferrite core material has its optimum frequency range. Also on higher frequencies the wire inductance and grounding gets (even) more troublesome. On the other hand, "everything", specially the transformer, gets smaller on higher frequencies. Be also aware the ripple current limits of capacitors, that can be an issue even on smaller effects than your design requires!
Good luck!
ted