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Extra info for Designing with SPICE 3
This allows the device to be redesigned in order to reduce the problem. This interchange between the simulation and the device design is a powerful tool. The preservation of the intuitive connections between the device and the simulation model also helps to avoid modeling errors and to interpret the simulation results. 20 Chapter Two Ideal Components in SPICE Passive components The built-in models in SPICE provide reasonable ﬁrst-order approximations for circuit behavior. Unfortunately, most circuits must be designed to be tolerant of second-order effects, at a minimum, and must occasionally provide compensation in order to achieve a desired performance level.
21 The parameters that must be passed to the subcircuit include the following: Flux capacity in volt-seconds (VSEC) Initial ﬂux capacity in volt-seconds (IVSEC) Magnetizing inductance in henries (LMAG) Saturation inductance in henries (LSAT) Eddy current critical frequency in hertz (FEDDY) The saturable core may be added to a model of an ideal transformer to create a complete transformer model. To use the model, just place the core across the transformer’s input terminals and specify the parameters.
To make a transformer model that more closely represents the physical processes, it is necessary to construct an ideal transformer and model the magnetizing and leakage inductances separately. The ideal transformer is one that preserves the voltage and current relationships shown in Fig. 4 and has a unity coupling coefﬁcient and inﬁnite magnetizing inductance. The ideal transformer, unlike a real transformer, will operate at DC. This is a property that is useful for modeling the operation of DC-to-DC converters.