OPTICAL_ISOLATOR_WATTMETER

Published:2009/6/19 2:45:00 Author:May | From:SeekIC

The quad-channel optical isolator, consisting of LED L1 through L4 and phototransistors Q1 through Q4, is connected in a double bridge configuration. The arrangement serves to compute the four-quadrant product of ac line voltage and 21 load current. The result is an accurate representa-tion of the true instantaneous power delivered to the load--even if the line voltage wanders and the load is reactive and nonlinear. This wattmeter function is, of course, optically isolated from the ac line, has full-scale limit of 1300 W, and is output with scale factor of 1 V/100 W.



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