Steady-state analysis and stability of a magnetic frequency tripler

A magnetic frequency tripler is a nonlinear device that is used to produce third-harmonic frequency output from a three-phase fundamental frequency source. Previous analyses of triplers assumed that the undesired harmonic currents generated by the magnetic cores could be returned to the input lines. In order to improve the performance of a frequency tripler, input-line filters are required. The presence of line filters influences profoundly the behavior of the device since harmonic voltage components other than the fundamental are allowed to exist at the frequency tripler terminals. In this paper a method is presented to analyze a line-filtered magnetic frequency tripler, and to investigate its stability.