Validation and comparison of different PWM converter small signal models

In order to determine which small signal model most accurately describes PWM converters, a comparison with a switched model is necessary. Due to parasitic effects the comparison with hardware measurements does not clarify this question. Therefore published small signal models based on ideal components are compared with a time domain simulation of a switched converter using the same idealization in this paper. The transfer function is determined by emulating the quadrature detector used in practical measurement set-ups. The paper shows the theoretical background, the implementation in SPICE and the comparison with traditionally found transfer functions.