Abstract:

In view of the blindness of the trial-and-error method in the design of DC-DC transform compensation network and the complexity of theoretical analysis, based on the state space average method, this study takes Buck as an example to model the DC-DC transformation system. Under the condition that the amplitude margin and phase margin are satisfied, the relationship between the compensation network k_p, k_i and the system parameter duty ratio D, inductance L and capacitance C is derived, and on this basis, an engineering approximation method is proposed. The proposed method is verified by PSIM simulation and a prototype platform based on DSP. The results show that the results obtained by this engineering approximation method are basically consistent with the theoretical analysis method, that is, the traditional control method, no matter in the case of voltage single closed loop or in the case of voltage outer loop and current inner loop. This engineering approximation method avoids the blindness of trial and error and the complexity of traditional control methods, which is the complexity of traditional control methods, and provides a quick method and idea for the rapid design of compensation networks in actual projects.

Key words: DC-DC conversion, compensation network, trial and error method, engineering approximation, state space averaging method, amplitude margin, phase margin, PSIM simulation