The 100~200W full-automated regulator profile circuit of the dual relays

Published:2011/6/25 20:56:00 Author:qqtang | Keyword: full-automated regulator, profile circuit | From:SeekIC

Circuit principles: the grid power supply is connected with the 3-pin of transformer B by the switch and the normally closed spot J. R1 is the sampling resistor, BG1 and BG2 compose the control circuit, which changes the control spot by adjusting W. When the grid voltage is lower than 220V, the normally closed spot makes transformer B form a step-up style. When the output voltage is not higher than 220V, J gets through the 5-pin of the transformer. If the voltage is higher than 220v, J2 is pulling in and connected with the 4-pin of the transformer. When the grid voltage is over 220V, R1 is sampling, which pushes J1 to pull in and connect with 5-pin of the transformer, and the step-down style is formed.



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