Small Signal Analysis of Non-Ideal Tri-State Boost DC-DC Converter for Low Power Circuits

The necessity of having a stiff voltage source irrespective of any perturbations in the input and load conditions with parametric uncertainties is the demand of the next generation switch mode power supplies for low/high power applications. In the presented paper, the analysis of non-ideal tri-state boost (TSB) DCDC converter for low power circuits is explored with detailed modeling of small signals and stability analysis. The tri-state boost (TSB) boost DC-DC converter with steady state and transient state performance is also presented. The PI controller provides less phase boost in the phase plot of the converter which can be mitigated by Type II compensator with an extra pole at the origin. The boost DC-DC converter topology possesses a shifted right-half plane (RHP) zero in its small signal control. With the Type II compensator (T2C), there is an added degree of freedom in terms of poles. The absence of RHP zero in the TSB DC-DC converter allows the controller to attain a larger bandwidth under the closed loop condition, maintaining a smooth response. The presented system performance and results are validated using MATLAB/SIMULINK software.