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Ridley model with complex loads

Ridley model with complex loads

(OP)
Does anyone have any experience working with the Ridley model for a current mode control PWM with complex loads?

My load is a mixture of resistors, diodes, caps and inductances. The CMC-PWM spice model for my circuit using a simple block with a modulator gain instead of the Ridley model works well, i.e. that Bode Plot looks the same as the output of the HP phase gain analyzer. However, the spice ckt with the Ridley model gives a totally different result.

My first thought is that my parameters may be wrong. From his paper, it looks to me that the "RL" term in the Ridley model is simply a term for Vout/Iout to set a DC operating point and that's what I used, even though the load is not a simple R. Maybe this is the flaw but it's hard to tell. Maybe it's something else.

Thanks in advance for any insight here.

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