What is the basic principle of switching power supply?
So as to achieve automatic adjustment of the high-frequency pulse voltage duty cycle to achieve the final output DC voltage stability. Adjust the output DC voltage principle is the same, with artificial methods to change the oscillation frequency and pulse duty to achieve the purpose of changing the output DC voltage. Simply put the basic principle of switching power supply is: AC variable DC variable pulse voltage and then change the process of a DC. It has a high precision regulator, small consumption and other characteristics.
The exchange through the diode rectifier. Capacitor filter into DC, and then through the 1620KHz high frequency oscillation generator. Switch and high frequency switching transformer role, the DC into the required amplitude of the high frequency pulse voltage. And finally through the high frequency of the two poles to the high frequency pulse voltage rectification. Capacitance filter output required DC voltage. The output regulator is to rely on the output to remove the sampling voltage to adjust the oscillator frequency and pulse duty cycle.
The basic principle of switching power supply is:
The 220v 50HZ exchange, finishing 300v DC, the switch and the oscillation circuit, so that it becomes 40KHZ or higher frequency square wave voltage, coupled through the high-frequency transformer to the secondary, so that the secondary to get the required voltage The
That is, the actual switching power supply, is the high-frequency transformer.
