Working Principle of switching power supply: 1. AC power input is rectified and filtered into DC; 2. Through high frequency PWM (Pulse width modulation)
The signal controls the switch tube and adds the DC to the primary of the switch transformer; 3.
Switching transformer secondary induction of high frequency voltage, through the rectifier filter supply load; 4.
The output part is fed back to the control circuit through a certain circuit to control the PWM duty cycle so as to achieve the purpose of stable output.
When the AC power supply is input, it usually needs to pass through something like the current circle to filter the interference on the power-down grid, and at the same time filter out the interference of the power supply to the power grid;
At the same time of power, the higher the switching frequency, the smaller the volume of the switching transformer, but the higher the requirement for the switching tube;
The secondary of the switching transformer can have multiple windings or one winding can have multiple taps to obtain the required output;
Generally, some protection circuits should also be added, such as no-load, short-circuit and other protections, otherwise, it may burn down the switching power supply. High-power switching power supply has been widely used in industrial automation control, military equipment, scientific research equipment, industrial control equipment, communication equipment, power equipment, instruments and meters, medical equipment, semiconductor refrigeration and heating. and other fields. Dear Customer: Hello!
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