应用于精密开关校验电源的SHEPWM优化策略的研究

Research on SHEPWM Optimization Strategy Applying to the Precise Switching-Mode Verifying Power Supply

针对SHEPWM调制方法应用于精密开关校验电源中出现的选定消去的谐波部分幅值略高,不能满足调节精度要求的问题,依据对原有的SHEPWM的理论分析,提出了一种优化的SHEPWM调制方法,建立了此种优化SHEP-WM的理论模型,并依据建立的数学模型对此种优化方法控制的单相两重化全桥逆变器进行了仿真。仿真结果表明这种优化的SHEPWM控制策略下的校验电源可以达到更高的调节精度,更优的消谐效果。

Some of the selected harmonics amplitude are a little higher in the practical application,they are not able to satisfy the request adjusting accuracy, when the SHEPWM modulation method is applied to the precise switching-mode verifying power supply. To solve these problems, according to the original SHEPWM theoretical analysising, one optimized SHEPWM modulation method is proposed. Then a optimize SHEPWM theoretical model is established. Based on the mathematical model,a dual single-phase full bridge inverter controlled by the optimized method is simulated. And the results of simulation indicate that the verifying power supply controlled by the optimized SHEPWM modulation method is able to reach higher adjustment accuracy and get better effect in harmonic elimination.