Variable parameter model for low-power PT

To reduce the analytic error, a new variable parameter model for low power PT has been explored in this paper. A multi-frequency test approach is proposed to obtain more exact internal parameters of PT´s model. Based on its conventional model, a set of multi-frequency equations is built up. Through solving these equations by employing the measured data, the internal parameters of PT´s model is determined. Some experimental results are provided in this paper to verify the variable parameter model. The experimental results show that the maximum analytic error of the new model is less than 5%. The variable parameter model is an important tool for analyzing and designing PT converter.