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A frequency-domain small-signal analysis of resonant power converters is presented. In this analysis, the load presented to the ac side of the rectifier is modeled as a time varying resistor. Using conversion matrix techniques and an iterative procedure to find the magnitude and phase of the time-varying resistor, the transfer functions of the converter can be obtained fast and accurately. An advantage of this approach is that the analysis can be carried out with the load represented in the frequency domain. This is a significant advantage when dealing with complex (e.g., plasma) loads where only measured small-signal impedance data may be available. An example demonstrating the accuracy of the method is presented.