M15M machine core protection circuit

Published:2011/6/12 22:47:00 Author:Christina | Keyword: machine core, protection circuit | From:SeekIC

The M15M machine core protection circuit is as shown: 1.When the voltage of the CRT's filament increases, the voltage which is rectified and filted by the D523 increases too, the D522 conducts, the high voltage adds to pin-2 of the IC601, the X-ray protection circuit starts working to cut off the line excitation output, the device stops working. 2.When the voltage of the CRT's filament decreases, the the voltage which is rectified and filted by the D523 decreases too, at this time the D524 conducts, the base port potential of the Q503 decreases, the collector potential increases, the voltage of IC601's pin-52 increases, and the X-ray protection circuit starts working to cut off the line excitation output, the device stops working. 3.When the CRT's brightness is too large, the device stops working. 4.When the 15V power supply voltage increases, the device stops working.



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