Digital Control Buck Converter - Reducing the Impact of Load Change on the Output Voltage

J. Kaczmarek, R. Suszyński (Koszalin Univ. of Techn., Poland)

Power supply circuits used for example to power a high performance electronics systems and modern processors have to keep the supply system stable despite rapid changes of power consumption. For this reason, the choice of the correct transfer function parameters of digital control system in main block of the converter is particularly important. The study proposes a method of shaping the transfer function of digital control circuit providing effective suppression the output voltage fluctuations when responding to load changes. The method of choosing the transfer function parameters of digital control circuit is shown on the example of the Buck converter controlled by voltage-mode CCM (Continuous Conduction Mode).