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高频软开关电源的研究

Study on High Frequency Soft-Switching Power Supply

【作者】 李昕玉

【导师】 李春华;

【作者基本信息】 黑龙江科技学院 , 电力电子与电力传动, 2009, 硕士

【摘要】 随着电子技术的高速发展,开关电源已广泛应用于工业、交通、电力等领域。但常规变换器工作在硬开关方式下,开关频率不高,开关电源的效率也不理想,而软开关PWM技术的提出使变换器在高频下高效率地运行成为可能。移相控制零电压开关全桥变换器就是采用软开关PWM技术,利用变压器的漏感和开关管的结电容实现开关管的零电压开关。本文在原边加入一个由谐振电感和箝位二极管组成的辅助谐振支路,通过将辅助支路与超前桥臂相连,不仅抑制了副边寄生振荡和电压尖峰,而且减小了箝位二极管上的有效电流值,同时还减小了原边通态损耗和副边占空比丢失。详细分析了改进后变换器的工作原理和软开关实现条件。由于在辅助支路串接了限流电阻,箝位作用受到影响,为了更好地抑制副边寄生振荡和电压尖峰,在副边加了箝位吸收电路,并对其工作原理进行了分析。在理论分析的基础上,初步设计了一个220V/10A的直流电力操作电源,并对电源的主电路、控制电路、驱动电路、保护电路进行了详细的设计,给出了理论设计参数。通过PSPICE仿真结果证明了分析和设计的正确性。

【Abstract】 With the development of electronic technology, switching supply has been widely used for industry, transportation, electricity etc. But the conventional converter operates in hard switching, low switching frequency and low efficiency. So the soft switching PWM technology is proposed. And it makes converter that operates in high efficiency and high frequency as possible.In order to restrain the parasitic oscillation and the voltage ringing of the rectifier diodes, auxiliary resonant commutating network including a resonant inductor and two clamping diodes auxiliary branches can be introduced to the Primary side. The converter can be improved that the auxiliary branch is connected with the leading leg of the transformer. So, the improved converter not only restrains the voltage ringing of the rectifier diodes, but also reduces secondary duty cycle loss and the Primary current in zero state. Because of a resistance in the clamping diodes auxiliary branch, the effect of the clamping diodes auxiliary branch is weakened. In order to restrain the parasitic oscillation and the voltage ringing of the rectifier diodes better, a simple RLCD clamping circuit is placed in the secondary side of the full bridge converter. It not only restrains the voltage ringing of the rectifier diodes, but also avoids the defect of the general RCD buffer absorption network.Based on the analyzing of the theory, a switch power supply of 220V/10A for electrically operated power supply is designed. The scheme verified by PSPICE simulation shows the circuit topology is right.

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