Pulse-waveform integral approach-a unified approach to model switching converters for the types of PWM

quasi-resonance and series（parallel） resonance is put forward in the paper.With the approach

the speciality of a converter can be embodied

and a unified standard may be set up for the analyses and comparisons among the converters.As examples

PWM and quasi-resonant converters are used to discuss the principle of the approach.The results are compared with those in the relative paper.Computer aided andyses ae made confirm the correctness.