PSpice User Guide

PSpice User Guide

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PSpice User Guide Setting initial state October 2019 834 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Setting initial conditions The IC property allows initial conditions to be set on capacitors and inductors. These conditions are applied during all bias point calculations. However, if you select the Skip Initial Transient Solution check box in the Transient Analysis Setup dialog box, the bias point calculation is skipped and the simulation proceeds directly with transient analysis at TIME=0. Devices with the IC property defined start with the specified voltage or current value; however, all other such devices have an initial voltage or current of 0. Note: Skipping the bias point calculation can make the transient analysis subject to convergence problems. Applying an IC property for a capacitor has the same effect as applying one of the pseudo-components IC1 or IC2 across its nodes. PSpice attaches a voltage source with a 0.002 ohm series resistance in parallel with the capacitor. The IC property allows the user to associate the initial condition with a device, while the IC1 and IC2 pseudo-components allow the association to be with a node or node pair. See Setpoints on page 832 for more information about IC1 and IC2. In the case of initial currents through inductors, the association is only with a device, and so there are no corresponding pseudo-components. The internal implementation is analogous to the capacitor. PSpice attaches a current source with a 1 Gohm parallel resistance in series with the inductor.

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