Olin,

Main idea for counting from 0-360 is that there are 4
Pulses top 2 and bottom 2 they run at 60hz no matter what
And they move right and left.
Their normal startup looks like this:
Top2 starts at 180degree and bottom 2 starts at 28degree now
That's when x register=28 default. When x register changes becomes
29 top 2 pulses moves 1 degree left which is 179 degree and
bottom 2 moves 1 degree right becomes 29 degree. 60 hz never gets
changed. Top2 and bottom2 they are inverted from each other this
is how inverters generate sinusoid. It looks like 47,25 us
is ok to use but your calculation is better. I didn't want to talk about

it in detail because people do not want to read long e-mail.
After all final output looks like this.

            <== moves left
     B1     T1
     |------|                  |------|
     |      |                  |      |
------      |-----|      |-----|      |-----
                  |      |
                  |------|
                  B2     T2
                ==> moves right

B1 = rising edge of bottom pulse
B2 = falling edge of bottom pilse
Same thing for T1 and T2.
based on battery voltage and current load x register will
be updated in order to keep stable 110v 60 hz 40amp sinusoid.

Andre Abelian





-----Original Message-----

andre abelian wrote:
> This is for power inverter that from 0-360 must be 16.66 ms
> 16,66/360=46.27us  but we are getting 46.25us.

Duh!  This is wrong, and sounds silly anyway.

The period of a 1 degree phase change of a 60Hz sine wave is 1 / (60Hz *
360deg/Hz) = 46.30uS/deg.  Therefore 46.27uS is actually closer than
46.25uS, but neither is accurate to within the 4 implied digits.

Furthermore, why does this inverter need to do whatever it does exactly
every 1 degree?  Degrees are a human convention, but there is otherwise
nothing magic about 1/360 of cycle.


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