反激变换器具有结构简单、成本低、可靠性高等优势，在电源适配器、模块电源等中小功率场合得到广泛应用，但其存在损耗大及电磁干扰问题。为此，本文提出了一种原边采用有源钳位技术，副边采用自驱动同步整流电路的新颖自驱动同步整流有源钳位反激变换器，可有效提升变换器的整体效率，具有重要理论研究意义及工程应用价值。

首先分析了有源钳位反激变换器的原理，并对所提出新颖自驱动同步整流电路原理进行了深入研究，指出该驱动电路可使同步整流管结电容充放电速度更快，进而可有效提升开关管的开关速度及变换器效率。根据流过变换器二次侧电感电流是否降为零将变换器划分为DCM、CCM及CrCM三种工作模式，并分别对其能量传输过程及其对开关性能的影响进行了深入分析，得出了确保原边主开关管实现ZVS及副边同步整流开关管实现ZCS的最优工作模式，并对保证变换器工作在最优工作模式下的调制技术及控制策略进行了深入研究。通过对变换器的软开关特性及实现条件进行分析，得出了原边开关管均实现ZVS的最小死区时间。分析了变压器原边寄生电容对软开关性能的影响，指出开关管的ZVS性能可通过减小寄生电容得到改善，并提出了一种可有效降低变压器寄生电容的新颖变压器绕制方法——分段累进型绕法。综合考虑变换器的纹波电压指标要求、开关管的电压电流应力及其实现软开关的条件，得出了元件参数设计方法。

研制了一台5V/10A的新颖自驱动同步整流有源钳位反激变换器样机，仿真及实验结果表明变换器能可靠实现软开关性能，且各项技术指标均达到设计要求，有效提高了效率，验证了理论分析的正确性及所提出自驱动同步整流电路和参数设计方法的可行性。

The flyback converter has the advantages of simple structure, low cost and high reliability. It is widely used in small and medium power occasions such as power adapters and module power supplies, but it has large losses and electromagnetic interference problems. To this end, this paper proposes a novel self-driven synchronous rectification active clamp flyback converter with active clamping technology on the primary side and self-driven synchronous rectification circuit on the secondary side, which can effectively improve the overall efficiency of the converter and has important theoretical research significance and engineering application value.

Firstly, the principle of the active clamp flyback converter is analyzed, and the principle of the proposed novel self-driven synchronous rectification circuit is deeply studied. It is pointed out that the driving circuit can make the synchronous rectifier tube junction capacitance charge and discharge faster, thereby effectively improving the switching speed of the switch tube and the converter efficiency. The converter is divided into three working modes: DCM, CCM and CrCM according to whether the current flowing through the secondary inductor of the converter drops to zero. The energy transfer process and its influence on the switch performance are analyzed in depth, and the optimal working mode to ensure that the primary main switch tube achieves ZVS and the secondary synchronous rectification switch tube achieves ZCS is obtained. The modulation technology and control strategy to ensure that the converter works in the optimal working mode are studied in depth. By analyzing the soft switching characteristics and implementation conditions of the converter, the minimum dead time for the primary switch tube to achieve ZVS is obtained. The influence of the primary parasitic capacitance of the transformer on the soft switching performance is analyzed, and it is pointed out that the ZVS performance of the switch tube can be improved by reducing the parasitic capacitance. A novel transformer winding method that can effectively reduce the parasitic capacitance of the transformer is proposed-the segmented progressive winding method. Considering the ripple voltage index requirements of the converter, the voltage and current stress of the switch tube and the conditions for achieving soft switching, the component parameter design method is obtained.

A 5V/10A novel self-driven synchronous rectification active clamp flyback converter prototype was developed. The simulation and experimental results show that the converter can reliably achieve soft switching performance, and all technical indicators meet the design requirements, effectively improving the efficiency, verifying the correctness of the theoretical analysis and the feasibility of the proposed self-driven synchronous rectification circuit and parameter design method.

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