【摘要】 提出一种基于LLC谐振电路和移相全桥电路的混合调制型三路输出DC-DC变换器,根据LLC谐振电路与移相全桥电路不同的调制原理,采用脉冲频率与移相混合的调制方式实现三路输出的调节。该文提出的变换器可以等效成一个输入并联-输出串联结构的LLC谐振电路和两个移相全桥电路,由于LLC谐振腔的存在,开关管可以在全负载范围内实现零电压软开通;移相全桥电路的辅助电感无需特别设计,可以减小由辅助电感引起的占空比丢失的问题。本文对提出的变换器的工作原理与工作特性进行了详细的分析,并通过一台输出功率1.4kW的原理样机,验证了所提出变换器的有效性。更多还原

【Abstract】 This paper proposes a hybrid modulated triple-output DC-DC converter. Based on the different modulation methods of the LLC resonant converter and phase shift full bridge converter, this paper proposes a hybrid modulation including the pulse frequency and phase shift angles. The triple outputs can be regulated based on the hybrid modulation of pulse frequency and phase shift angles. The structure of the proposed converter can be equalized into an input-parallel-output-series LLC resonant converter and two phase-shift full-bridge converters. What’s more, the power switches can achieve zero-voltage-switching over the full load. The series inductance of the phase shift full bridge converter does not need to be specially designed, and thus the duty cycle loss caused by the series inductance can be mitigated. This paper analyses the working principles and characteristics of the proposed converter in detail. Finally, a 1.4 kW prototype was built and tested to verify the effectiveness.更多还原