日本アイ・ビー・エム株式会社 IBM Japan A switching control system to convert a form of the power mutually and get desired power, there is a power noise by the switching. In this paper, to understand the theory, 2 level control single-phase full bridge inverter circuits by PWM which converted power into AC-DC was made and analyzed it in SPICE simulator. As a result of transient analysis, a noise having plural frequency ingredients was observed to an output waveform. These frequency ingredients were confirmed

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... orrelation with the impedance profile of the circuit. It was found that the noise comes from parallel resonance with capacitors, parasitic capacitance of the FET, and parasitic of the bootstrap.