This work shows a frequency do main technique based on the state vector approach and a simple switch device model for electromagnetic compatibility (EMC) power converter design. The conducted noise spectrum is straightforward computed in frequency domain for converters with alternating or direct current input sources. The method is validated and the results are compared with PSPICE time domain simulation mixed with FFT and measurements. The proposed technique is appropriate for applications where calculation speed is preferred rather than high precision. The method highlighted in this study is used in order to estimate the conducted disturbance spectra for various power electronic converters: series chopper, full wave mono phase inverter, PWM inverter, full bridge rectifier. With 'an additional fast algorithm used to find the soft switching event table, the method is employed with good results in EMC analysis for a resonant flyback converter. Other application of the proposed technique is the optimization of the filter elements in a buck converter structure in order to comply with EMC regulations.
