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It may use e.g. a grid voltage feed forward in output voltage generation, or even use the grid voltage waveform as current model.Well, what else does it need? A way to measure the grid voltage I guess...
FvM said:A digital controlller would most likely use AD converted grid voltages UV and VW.
Actually, I'm talking of both. The analog waveform contains both informations. As said, you need to acquire two interphase voltages and get the third by a simple arithmetic operation. Most DSP based three-phase controllers use αβ-transformed voltage and current quantities, which automatically removes the redundancy of a third voltage measurement.Again - We are talking about the grid voltage level not the phase of the voltage.
FvM said:differential amplifiers with good common mode rejection another.
Greeting!FvM said:...They use symmetrical voltage dividers and instrumentation amplifiers. Scaling of measured voltage to 0-3V range shouldn't be a problem....
As said: "Depends completely on your inverter's operation principle". My suggestions are assuming a usual space vector based controller. Your design possibly works different.the zero-cross detection capability of the circuit suffers because it will detect the zero-crossing point with a delay
A proverb says "Paper doesn't blush".All we have to do now is pray that no one is ever going to look seriously at this paper.
karesz said:Hi Martin,
Their are some interesting components (maybe) for your application too from Silicon Labs: https://www.electronicspecifier.com...ete-Solution-for-Wireless-Mesh-Networking.asp
K.
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