SPICE simulation of PWM DC-DC convertor systems: voltage feedback, continuous inductor conduction mode

A simple and straightforward method is proposed for simulating the transient and small-signal responses of open and closed-loop switch-mode DC-DC convertors. The topology-independent method hinges on the substitution of the switched inductor, fundamental in the realisation of such systems, by an equivalent circuit which represents its average behaviour. This permits simulation by a general-purpose electronic circuit simulator such as SPICE. The proposed approach is demonstrated by presenting the simulation results of a boost convertor.