NONLINEAR MODELING OF SWITCHING DC-DC CONVERTERS WITH INDEPENDENT INPUTS

Analytical modelling of switching DC-DC converters to account for thei r nonlinear responses due to both control signal and supply voltage in puts is presented. These independent inputs can be composed of perturb ations with large amplitudes and phase shifts. The key is to extend th e Volterra functional analysis to nonlinear systems with two independe nt inputs. By applying the extended Volterra functional series, the co nverter output response is expressed as a summation of nth-order nonli near transfer functions, which can then be determined by explicit and recursive formulae. The modelling approach not only predicts various h igher harmonic frequency components, but also provides information abo ut the intermodulation frequency components.