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A new approach to designing CAD packages for PWM-controlled inverter systems is presented which involves an extremely powerful graphical user interface (GUI). This GUI facility allows the designer virtually instantaneous interaction with the PWM simulator CAD package, which can be used for PWM inverter system analysis, or for developing more complex single-phase and three-phase inverter systems. The whole CAD package can be run on a desktop PC or laptop computer in virtual real-time interactive mode. The accuracy of the computer modelling techniques used in the PWM CAD package is confirmed using experimental results from a microprocessor-controlled experimental inverter system.