Identifying the same polarity of the coil

Published:2011/5/30 4:10:00 Author:Seven | Keyword: same polarity | From:SeekIC

76.identifying the same polarity of the coilIf we want to know the same polarity of the primary and second stage coil in a transmitter, we can judge by using identifiers which consists of elements like controllable silicons, etc. See as the circuit, it is designed according to the conducting condition of controllable silicons. At the moment of power-on, the primary coil L1 is generating sensing LEV of which the left is negative and the right is positive. If 1 and 3 are the same polarity, the pole of 3 will sense a positive LEV, put the two positive LEV on the positive pole and control stage,respectively, then the controllable silicon is conducting and the LED is glowing.



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