The switch tube is the main working device of the whole power supply. Correct selection is the premise of the successful production of the power supply.<br>First of all, the cut-off time of the switch tube should not be too long. If the cut-off time is too long, when the last control pulse of the switch tube has ended and the next control pulse has arrived, it will cause the switch tube not to be completely turned off, and it will enter the next turn-on cycle immediately, so that the switch tube is almost always on, the switch is completely out of control, and the power consumption and output voltage will be rapid Increase, causing damage to the power supply.<br>Secondly, the switch on time should not be too long. When the switching frequency is high, the switching on and off frequency of the switch is frequent, and the switching on time is long, which means that the switch has more time to work in the amplification state (after switching on, the power consumption of the switch will be increased rapidly, and the efficiency of the power supply will be greatly reduced).<br>
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