The Buck converter is also called a buck converter, a series switching power supply, and a three-terminal switching buck regulator. This article explains the transfer function of the buck converter.
Main circuit diagram of buck converter
The output voltage is controlled by d, the transfer function from d to the output voltage:
Using matlab to simulate the design of the regulator, in order to achieve simplicity and achieve a good adjustment effect, the PI regulator is selected, and the zero-pole is added to make the transfer function meet the design requirements. The adjusted Bode plot is as follows:
The transfer function of the regulator obtained by matlab is:
The transfer function of the PI regulator according to the K factor method:
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