Analytic Model of the Parallel Resonant Converter

• Main Authors: Ching-Ming Cheng, 鄭金明
• Other Authors: Jung-Chien Li
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/95674450820661734360

碩士 === 國立海洋大學 === 電子工程學系 === 83 === Parallel resonant converter is a widely used converter. The steady-state analysis of the lossy parallel resonant converter is presented with closed-form expression. The phase difference between the input square-wave voltage and the output square- wave current which excite the resonant tank is used as the parameter to plot the converter output current and voltage characteristic for given damping ratio and switching frequency. The load line can be superimposed on the output characteristic to determine the operating point and the value of the associated parameter (by using linear interpolation) , which can be used to plot the resonant-tank waveforms. The upper bound of the switching frequency can be found as a function of the threshold voltage of the output rectifier and is practically independent of the damping ratio. The damping has a serious effect when the switching frequency is near resonance in that the output characteristic is far from an ideal current source as in the lossless case.