Congratulations for so far, Pierre. I'm going to make a printout of the software, to get more involved.doc007 said:Hello Friends, After modification of the soft I have finally a pure sine wave of 50 Hz on the output. Pierre
Pierre, am I right that the above modified quote is what you are asking?doc007 said:After numerous tests I come to the following conclusions :
-1) The a/b voltage check is well working in pwm norm, pwm stop and pwm stdby but not in pwm start. Why?
-2) During positive sine half wave we can only test b/voltage and during negative sine half wave we can only test a/voltage.
In effect if I want to test b or a/voltage by changing MuxA or B, I have the high-levels of 'a' and 'b' on PICpin2, and not the low-levels.
Am I wrong ? Pierre.
b/a signal (pin2 - RA0/AN0) must include only a low levels of the separeted 'a' and 'b' signals (pin2 and pin1 - U10). If b/a signal include only a high-levels of signals 'a' and 'b', then you must change a connection places of this two signals to pin1 and pin2 of the U10 (a<->b and b<->a).
I'm not sure anymore that the above is right. Because the a and b signals are clipped with zeners to +5.1v, they can't be regarded as analog (which goes to +12).@t said:So at start-up, zero b/a is ok, then after initiatiation an analog value is ok (maybe 3v?) and too high is not ok (regulate pwm down, as reaction), also too low is not ok (means overload).
Maybe here (in pwm start) not "zero" is demanded, but a higher value is allowed because the cyclus is starting up.Pierre said:Only during the first positive hemi wave ( pwm start) the a/b test is higher than a/b max ( 1.8 V ) and I don't understand why
Yes, that's no problem Pierre.doc007 said:// Can I replace it by 2 trafos 300 Watt in parallel or 3 trafos 200 watts in parallel ? // Pierre
Yes, maharadga is right, there have an error in schematics.
Please accept my apologies for this error. It happened when I redraw the schematics from original one. In the original schematics the anods of two bootstrap diodes (D6 and D7) are connected to the output of LM317T, but then this voltage should be min. 10V (minimum supply voltage requirements for optodriver TLP250). Old shematics was designed for 24V accumulators. And the output voltage of LM317T was 12V.
In case of 12V accumulator we should replace LM317 with LDO voltage regulators for 10V output voltage (some like LM2940LD-10).
Only for 300W Pierre, 2x 10,5v to 230v. Torroid model.doc007 said:Hello Friends, has nobody found a trafo for this project ? Pierre