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The authors earlier proposed an orthogonal-core type push-pull converter. The converter was constructed with a pair of orthogonal-cores whose primary sides were excited by square-wave choppers, and the converter had almost sinusoidal output current and high power factor. In this paper we report a photovoltaic power system using the push-pull converter. The test results obtained in the trial system indicate that the orthogonal-core type push-pull converter can be applicable to a practical photovoltaic power system. As another application, an orthogonal-core type push-pull parametric transformer is also described here. It was experimentally clarified that a low distorted input current and high input power factor are obtained in the push-pull parametric transformer.