STEADY-STATE ANALYSIS INCLUDING PARASITIC COMPONENTS AND SWITCHING LOSSES OF BUCK AND BOOST DC-DC PWM CONVERTERS UNDER ANY OPERATING CONDITION

A detailed analysis of DC-DC buck and boost converters operated both i n continuous and discontinuous current modes is reported. Expressions for the voltage transfer functions and efficiencies of these two basic topologies have been derived in a closed form. These equations descri be the converter behaviour for both constant output voltage and consta nt input voltage operation. Voltage transfer functions are derived so that the load regulation characteristics of the converters are closely described, including those for continuous current mode operation. Bec ause of this, they can be effectively used to design a converter circu it responding to any given design specification. Both the equations fo r the efficiencies and voltage transfer functions are general and the values of the parasitic parameters to be introduced can be found on th e component data sheets or derived from simple measurements. Because o f this, results of the analysis presented can be effectively used in t he optimization of the converter circuit performances. The general app roach to the analysis of power converters including parasitic componen ts given in the paper can be applied to any power converter circuit. T heoretical derivations are in good agreement with the results of compu ter simulations performed by using the PSpice program.