Sine wave power inverter

[babalola]

Hi Das,

The e(k+1) is the present error
e(k) > past error
u(k+1)> present output of the pi controller
u(k) > past output of the controller
the above are digital parameters of the pi controller and in the course of getting these parameter there is alway need for sampling time (T), the propotional gain of the controller Kp and the zero placement of the controller which is WI
INTERGRAL GAIN KI=Kp*WI
therefore A=Kp(WI*T -1)
while B=Kp

Example if kp=0.04 and WI =3140rad/sec SAMPLING TIME OF 10us

KI=188.4
A=0.04(3140*10US-1)
B=0.04

Remember in PI controller proportional looks at present error while intergral looks at past errors

Regards,
babalola.

[picgak]

Hi sougatha and Thank you,
I have been a regular visitor to the Thread sine wave power inverter for a long
time. I am happy to get a reply for my first query from one of the experienced hands. My
knowledge of PIC programming is minimal. I got the inspiration to do this project for my
home from here. Can you kindly suggest me a link to learn PICBASIC commands in some detail.

[sougata]

Hi,
With the above diagram. The Bridge Rectifier part from the AC mains turns it into an online UPS and needs to be controlled type for steady DC Bus Voltage. As already mentioned if the DC bus voltage is kept steady the output would also be steady.
Regarding PICbasic Pro, I learnt everything from this forum and owe all the contributors a lot. Best is take up one programming challenge at a time and get a grip on the concepts involved. This forum is a life-saver. I do not do basic much still while searching information this is the first place I take a peek.
Good Luck.

[iw2fvo]

Hi Sougata,
It is long time i am looking in this forum for a complete project relevant to a 200 > 500 Watt sine wave inverter.
Is there any possibility for me to have schematics diagram and software for such a project ?
I will appreciate very much your reply on the matter .
Thanks
Ambrogio

[sougata]

Hi,

I do not have a complete design in PBP. My initial design based on 18F452 was a commercial flop so I had to develop one on 16F72/73. Since my initial design there has been a number of improvements in the hardware side too. Like for a 12 volts system I implemented a MOSFET driver with internal charge pump that reduces the switching and conduction loss. Because while the battery is discharging the deep discharge cutoff threshold is generally 10.8 volts so the gates are pumped with merely 10 volts which should drive them into enhancement modes but with a PWM at 20KHz the switching losses are high.

But iw2fvo you are right that there should be complete relevant project to get started. I couldn't do it for babalola though... I definitely have in mind to rig up something for the wiki

[Normnet]

While browsing this microcontroller controlled device caught my eye:
I believe this has the potential to be a game changer!

The AD9833 is a low power, programmable waveform generator capable of producing sine, triangular, and square wave outputs.
The output frequency and phase are software programmable, allowing easy tuning. No external components are needed.
The AD9833 is written to via a 3-wire serial interface.
This serial interface operates at clock rates up to 40 MHz and is compatible with DSP and microcontroller standards.
The device operates with a power supply from 2.3 V to 5.5 V.

Norm

[sougata]

Hi,

The application domain for the AD9833 is much wider than the scope of a sinewave inverter. It is majorly used as a function generator. Since we would be producing either 50Hz or 60 Hz it would be an overkill for the application. Making most of the controller and crushing the BOM is also part of the job.

[iw2fvo]

Hi Sougata ,
thanks a lot for having reply to me.

I do understand that there is no PCB for the project at the moment , but I am still interested in understanding the system operation and I would like to experiment it on my little laboratrory. I am an Italian Radio Ham and the inverter will be used as a backup power source for my radios only.
Is it possible to have a system description, a block diagram and a schematics diagram for me to implement and test the project ?
Is the program written in assembler ?
I will appreciate very much to read back from you.
Thanks in advance.
Regards,
Ambrogio
Iw2fvo[


QUOTE=sougata;108771]Hi,

I do not have a complete design in PBP. My initial design based on 18F452 was a commercial flop so I had to develop one on 16F72/73. Since my initial design there has been a number of improvements in the hardware side too. Like for a 12 volts system I implemented a MOSFET driver with internal charge pump that reduces the switching and conduction loss. Because while the battery is discharging the deep discharge cutoff threshold is generally 10.8 volts so the gates are pumped with merely 10 volts which should drive them into enhancement modes but with a PWM at 20KHz the switching losses are high.

But iw2fvo you are right that there should be complete relevant project to get started. I couldn't do it for babalola though... I definitely have in mind to rig up something for the wiki[/QUOTE]

[sougata]

Hi iw2fvo,

Since I do commercial designs they are generally a client's property which I cannot publicly distribute. So to produce a Sinewave Inverter the hardware itself could be a great obstacle. PCB being one important component. So I am planning a make a fresh simple hardware design that can be easily produced by an average hobbyist.

BTW to run the radios you would need 13.5 Volts DC (my ham license never got renewed) if I am not wrongs so what are the loads you plan to use with your inverter.