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本文讨论了四路输出单端反激变换器的优化设计与分析。文中给出了优化数学模型,有16个设计变量、16个不等式约束,优化目标为变换器的功耗与重量加权和最小。用增广Lagrange乘子罚函数法编制了机辅优化程序(FORTRAN-IV),在PDP-11/03微型机上实现。令变换器的开关频率为常数,每隔10kHz计算一次,得到次优解。在20～60kHz范围内可画出表示功耗与频率关系的U形曲线。对本文讨论的电路有以下最优规律:变换器工作在电流不连续与连续间的临界状态;最优的稳态占空比约为0.3～0.34;变压器磁心的气隙宽度应尽量大些(例如1.2～1.3mm)等。
This article discusses the four-output single-ended flyback converter optimization design and analysis. In this paper, an optimization mathematical model is given, with 16 design variables and 16 inequality constraints. The optimization goal is to minimize the power and weight of the converter. The augmented Lagrange multiplier function method was used to compile the FORTRAN-IV program, which was implemented on the PDP-11/03 microcomputer. The switching frequency of the converter is constant, calculated once every 10kHz to obtain the second best solution. In the range of 20 ~ 60kHz can draw a U-shaped curve that shows the relationship between power consumption and frequency. The circuit discussed in this article has the following optimal rule: the converter operates in a discontinuous and continuous current critical state; the optimum steady state duty cycle is about 0.3 to 0.34; the air core width of the transformer core should be as large as possible For example, 1.2 to 1.3 mm).