The self-motivation switch stable power supply circuit

Published:2011/6/23 1:20:00 Author:qqtang | Keyword: self-motivation, power supply | From:SeekIC

When the power supply is installed, R1 provides with starting current for the switch pipe VT1, and VT1 is conducting, whose collecting electrode current IC is linearly rising in L1, in L2, there inducts a passive forward feedback voltage that the basic pole of VT1 is positive, and the emitter is passive, which makes VT1 saturate quickly. At the same time, the inducting voltage charges C1, as the charging voltage of C1 is rising, the basic pole LEV of VT1 is getting lower, which leads to the saturation of VT1 and VT1 quits the area, IC begins to get lower, and a voltage that the basic pole is passive and the emitter is positive is inducted in L2, so VT1 is blocked quickly.



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