一种提高双向全桥LLC谐振变换器反向电压增益的设计及实现

Design and Implementation of Improving Reverse Voltage Gain of Bidirectional Full Bridge LLC Resonant Converter

鉴于目前双向全桥LLC谐振变换器反向运行电压增益小于1,设计了一种新型控制策略,使其反向运行时电压增益不仅大于1,而且比原始控制策略下的电压增益更大,且效率更高。该设计在变频控制的基础上加入了移相控制策略,优化了原始控制策略,使用Matlab/Simulink搭建了变换器反向运行的仿真模型。经实验验证,新型控制策略可以进一步提高反向电压增益,证明了所提出策略的可行性。

In view of the problem that the voltage gain of bidirectional full bridge LLC resonant converter in reverse operation is less than 1, a new control strategy is designed. The voltage gain of bidirectional full bridge LLC resonant converter in reverse operation is not only greater than 1, but also greater than that of the original control strategy, and the efficiency is higher. The original reverse boost strategy of the converter is controlled by frequency conversion. In this design, the phase-shift control strategy is added to the frequency conversion control, and the original control strategy is optimized. The simulation model of the reverse operation of the converter is built by using Matlab/Simulink. Finally, the prototype is built to make experimental verification. By comparing the simulation results with the experimental results, it is found that the new control strategy can further improve the reverse voltage gain, which proves the feasibility of the proposed strategy.