As shown in the figure, a feedback winding is added to the L8 and L9 coils, and is connected to the auxiliary power supply of +20V~+25V via R1 and R2. During normal operation, the auxiliary power supply supplies current to the feedback winding and Q1 (via D1, D2) via R1 and R2. If the output voltage of the +3.3V power supply is lower than the normal value, it is divided by R4 and R5 and sent to the TL43l control pole. The voltage of R also decreases. The potential of cathode K of TL431 rises, the current of Q2 rises, the current of Q1 increases by R3, and the current of the feedback winding is shunted. The direction of current supplied by the auxiliary power supply to the feedback winding is not the same name from the feedback winding. The input of the terminal, the reduction of the feedback winding current is equivalent to the increase of the current from the same name, so L8, L9, the primary inductance decreases, and the output voltage of the +3.3V power supply rises, keeping the output voltage stable. The load current and the current of the feedback coil are not related to each other. The number of turns of the primary coil and the secondary coil can be designed according to the best effect, so the voltage regulation effect of the circuit is better. The number of turns of the L8 and L9 coils: the primary l1T, and the resistance of the feedback windings 25T, R1, and R2 are hundreds of ohms.
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