低压大电流开关电源的设计
发布时间：2018-12-13 11:06
【摘要】：微处理器的普及和运用，对供电电源提出了越来越高的要求，需要选择一种更适合的拓扑结构以满足将来开关电源发展的需要。文章以实际应用为背景，研究和设计一种低压大电流开关电源。 根据设计要求，采用了两级式变换器半桥+多相交错并联Buck的结构，该变换器具有热应力小、高功率密度、控制简单、高效率、动态响应快的优点，解决了传统单级式变换器中存在的控制难的问题。对输入、输出滤波电路进行了设计，对高频变压器的参数和磁芯结构进行了设计，，有效降低了变压器的磁损耗；确定了各部分的控制电路，并对控制电路的外围电路和辅助电源进行了设计，设计了电源的保护电路，有利于提高电源工作的稳定性；采用了同步整流技术，有效地降低了开关管的损耗；利用Saber软件对电路进行了仿真分析，实验结果验证了设计方案的可行性。 对仿真结果分析表明，纹波为0.5%，电源效率为96.8%，电源性能指标达到了课题设计的要求。
[Abstract]:With the popularization and application of microprocessors, higher and higher requirements are put forward for power supply, so it is necessary to choose a more suitable topology to meet the needs of the development of switching power supply in the future. Based on the practical application, a low voltage and high current switching power supply is studied and designed in this paper. According to the design requirements, a two-stage converter with half-bridge multi-phase interleaving parallel Buck is adopted. The converter has the advantages of low thermal stress, high power density, simple control, high efficiency and fast dynamic response. The problem of difficult control in traditional single-stage converter is solved. The input and output filter circuit is designed, the parameters and core structure of high frequency transformer are designed, the magnetic loss of transformer is reduced effectively. The control circuit of each part is determined, and the peripheral circuit and auxiliary power supply of the control circuit are designed. The protection circuit of the power supply is designed, which is helpful to improve the stability of the power supply. The synchronous rectifier technology is used to effectively reduce the loss of the switch, and the circuit is simulated and analyzed by using Saber software. The experimental results verify the feasibility of the design scheme. The simulation results show that the ripple is 0.5 and the power efficiency is 96.8.The performance of the power supply meets the requirements of the project design.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN86
本文编号：2376433
[Abstract]:With the popularization and application of microprocessors, higher and higher requirements are put forward for power supply, so it is necessary to choose a more suitable topology to meet the needs of the development of switching power supply in the future. Based on the practical application, a low voltage and high current switching power supply is studied and designed in this paper. According to the design requirements, a two-stage converter with half-bridge multi-phase interleaving parallel Buck is adopted. The converter has the advantages of low thermal stress, high power density, simple control, high efficiency and fast dynamic response. The problem of difficult control in traditional single-stage converter is solved. The input and output filter circuit is designed, the parameters and core structure of high frequency transformer are designed, the magnetic loss of transformer is reduced effectively. The control circuit of each part is determined, and the peripheral circuit and auxiliary power supply of the control circuit are designed. The protection circuit of the power supply is designed, which is helpful to improve the stability of the power supply. The synchronous rectifier technology is used to effectively reduce the loss of the switch, and the circuit is simulated and analyzed by using Saber software. The experimental results verify the feasibility of the design scheme. The simulation results show that the ripple is 0.5 and the power efficiency is 96.8.The performance of the power supply meets the requirements of the project design.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN86
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本文编号：2376433
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