Buck converter for low power delivery using Digital control method

This proposed method is explained in detail modeling of buck converter with parasitic element of branch circuits. Difficulties in direct implementation of PID controller is i) non-uniform sampling cannot be implement ii) cannot adjust the sampling instant, so to avoid this two things difference equation based PID controller is proposed. Fixed frequency-based modulation is widely used for low power supply application. High frequency digital pulse width modulation has a several advantage like size of the converter smaller and for fast switching mosfet switch is used. For any application fast recovery transient and low overshoot system has good voltage regulation and higher efficiency. In digital control method we have many control method but in this paper voltage mode control and mixed signal current mode control using difference equation based controller is proposed.