多路LLC谐振变换器交错并联均流控制

LLC谐振变换器多路交错并联具有良好的应用前景，然而谐振元件的参数偏差会导致各路LLC谐振变换器电流不均衡的问题。为了解决这一问题，通过将二次侧的同步整流替换为可控整流方式，利用各路输出电流作为控制信号对二次侧进行脉宽调制控制，提供附加的电压增益，形成均流控制环路，保证各路的电压增益相同，从而实现多路LLC谐振变换器在相同开关频率下运行的均流调节。介绍了该控制的原理及实现方法。基于电磁暂态过程进行仿真，得出不同负载率下的电流不平衡度；同时搭建100 W的实验样机，在电流不平衡度最大的工况下，验证了该均流控制方法的可行性和有效性。

Interleaved parallel current sharing control for multi-channel LLC resonant converter

The interleaved parallel of multi-channel LLC resonant converter has a good application prospect, but the parameter deviation of resonant element may lead to the current imbalance of each LLC resonant converter. In order to solve this problem, the synchronous rectifying at the secondary side of synchronous rectifier is replaced by controlled rectifying method, and the output current of each channel is used as the control signal to achieve pulse width modulation control of the secondary side and provide the additional voltage gain. The current sharing control loop is formed to ensure the same voltage gain of each channel, so as to realize the current sharing regulation of multi-channel LLC resonant converter under the same switching frequency. The principle and realization method of the control are introduced. The current imbalance degree under different load rates is obtained through the simulation based on the electromagnetic transient process. A 100 W experimental prototype is built to verify the feasibility and effectiveness of the current sharing control method under the condition of maximum current imbalance degree.