The power converter connected to energy source and linear electric generator is crucial powertrain and converting component, and it is mainly used in hybrid electric vehicle. For switching the states of release energy and absorb energy quickly and smoothly, the accuracy of converter model is very important for designing of control system. The performances of converter can be evaluated by modeling and simulation before produce actual circuitry, so the converter model is created in average model switch network. Simulation results have a distinction between the two models with average model switch network and state equations separately. In comparison the average model switch network is more identical to practical system, so it is more valid for guiding design of control system of converter.