Sine wave power inverter

[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.

[Normnet]

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.

Would it not produce a 50Hz or 60Hz sine wave with little code?
Low volume production may benefit.

Norm

[sougata]

Hi Norm,

Producing the sinewave is not the issue. It is just a counter >> Lookup table >> HPWM not much code indeed. However for a Power Bridge to be driven a lot more needs to be done. So if an AD9833 is used it attracts additional glue logic and circuitry making the design more complex in terms of Hardware. Being the author of FL (did I ever thanked you for it...my bad...I wonder how you could do such an elaborate software FREE....) you already know it is a lot more easy to copy/paste software than hardware!! Moreover the AD9833 is available only in MSOP if I am not wrong which makes it difficult for hobbyist to work upon. Consider the price against a PIC16F1824 on digikey. The AD sells for about $10 and the PIC is $1.5. The AD9833 works on the principal of DDS which is again mimic able by a PIC limited to much lower frequency within the Audio Range.

Since I do not have a complete (in all respect) PBP project on the sine wave inverter, I am making arrangements to do one. I suppose I would start making two PCBs. One with the MOSFET Power Stage (which you can blow up and still hope the micro is not fried !!) the other the controller itself, so that an experimentation platform is available for different options. All in single side, for Homebrew PCB. What do you say ??