基于LLC谐振的宽电压输出电源的研究

Research on wide-range voltage output source based on LLC resonant

针对传统LLC谐振变换器输出电压受负载和输入电压变化的影响较大,调节范围窄等缺点,提出了在变换器前端加入Boost电路,同时在变压器原边串联适当大小的电感来设计一种适用于宽范围可调的输出电压源。通过交流等效模型,分析了电路的直流增益特性,对谐振变换器的频率响应和其对电路参数设计的影响进行了分析,在理论分析的基础上进行了仿真验证和实验,给出了仿真和实验结果。

Because the output voltage of the traditional LLC resonant converter is greatly influenced by input voltage and load with narrow adjusting range, a kind of output voltage source with wide adjustable range was proposed, using Boost circuit in the front end of the converter and a inductance in series in the transformer＇s primary side. Through the AC equivalent model, the characteristics of the circuit DC gain were analyzed. And then, frequency response of the resonance converter and its influence on the design of circuit parameters was analyzed. On the basis of theoretical analysis, the simulation and experiment was done, and the simulation and experimental results were shown.