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The Role of Suppression Resistor in High Voltage Car Ignition Circuit—The Fast Fourier Transform Application
Ewa Klimiec, Stanislaw Nowak and Wieslaw Zaraska

The source of electromagnetic interference in a car ignition system is an electrical arc between the electrodes of a spark plug. In this paper the role of a suppression resistor is presented. The ceramic non-inductive bulk resistor was integrated with spark plug. It protects car electronic devices against electromagnetic interference. The resistor separates the source of electromagnetic interference from electrical leads of ignition circuit. Transient analysis of voltage in a car ignition system at high voltage side has been carried out. The voltage characteristics have been transformed from the time domain into the frequency domain up to 100MHz by means of Fast Fourier Transform (FFT). Calculation of the energy absorbed by the resistor was carried out.

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