Ok guys thank-you for the reports you gave me.
My supervisor for this project has said to me that this is my project and I can build my inverter any way I disire. However he did recommend that I build my inverter similar to those designs that had been done before.
The reports of the inverters from American Universities that you guys have sent me took about 6 or 7 people 3 months to complete. I have one academic year to complete an inverter by myself, so if I had to build, design and test something similar to those report I probably would not get it finished in time. And just for the record folks Im from the University of Strathclyde in Scotland.
So what I have decided to do is to go for a simple H-bridge inverter with LC filter and control the PWM by means of an analogue circuit. A transformer will be used to boost the AC voltage up to 230V to plug into the mains. This way I dont have to use a DC-DC converter. It also means I dont really have to buy any new equipment and can just use the stuff that's already avalible to me.
My inverter design is similar to those that have been built previous to my own, only the big difference is that I have decided to use an analogue circuit using 555 timers to create PWM rather than a DSP. This is a good way to get round having to learn how to program my DSP in code composer, however it does mean that designing an analogue circuit can be difficult, so there is no easy way of creating PWM.
The practical work for my project consists of 3 main parts:
1. Model inverter and simultate in MATLAB SIMULINK
2. Design, build and test analogue circuit to control PWM to inverter
3. Design an suitable transforment to boost output voltage from inverter to 230V
I know it might not be a power electronics problem, but I was wondering if anyone on here has anything on creating pulse width modulation for an inverter, using an analogue circuit. I not only have to design an analogue circuit to create PWM but also incorporate a control circuit which takes the power output from the inverter and feeds back to the PWM input and allow me to control the power output to the inverter. It should allow me to give any output power I disire and keep the voltage at 230V.
Please send me anything you've got on analogue circuits to control PWM.
Thanks again
David