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six-phase sine wave generator

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th3chass3r

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Hi,

I would like to create 2 x 3-phase sine wave generator in the range frequencies from 12 Khz to 15 Khz and final voltage from +18 V up to -18 V down.

I think I must adapt this circuit schema and put an inverter to have 6 phase offset identical.

I need a very "pure" sinusoidal wave form Khz : is it possible without the need of dds electronic ?

Is all of this realist ?


Thanks in advance.
 
You may want to start by giving this a read. While it is a three phase circuit I would imagine two such circuits could be built and the input clock to the second circuit shifted. Another method might be the use of a pair of small mechanically driven 3 phase synchros or small 3 phase PM motors. I assume you want 60 degrees phase lead / lag?

Ron
 
A six-bit serial shift register would produce 6 phase square wave with 60 degree phase. It's a matter of shaping the square wave into a sine, then amplify the resultant signal.
 
ReLoadRon has a good idea. I started out with DDS because it works! Then tried several analog solutions including PLLs to get the phase shift.

https://www.techbriefs.com/content/view/1839/32/

After looking at the above link I have an idea.

A switched cap filter like the MAX291/292/295/296 can take a square wave and make a sign by removing the harmonics. The filters need a clock of 50 or 100x the frequency of what you want. Make 1.5mhz and using a counter divided by 100 to get 15khz. Now feed the 1.5mhz into the clock of the filter and the 15khz into the input. You will get a very clean 15khz sign wave out. The 100 (or 50) does not need to be exact. You should use a number that is dividable by 6, more on that later, so use 102 or 96.

Using the counter create 6 square waves in phase like the the sign waves you want. Use ideas form the link above to get started.

You will need 6 low pass filters like the MAX291 all having the same 1.5mhz clock. Each filter will have a square wave input 1/6 out of phase.

No I am not going to draw a schematic. I hope you can use some of the ideas. Look for data sheets and application notes on parts like the MAX291.
 
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