交错并联Boost型开关电源模块设计

Power supply module design for peak current module control

交错并联Boost变换器结合电流模控制方式不仅能够实现相位间电流均流,而且还可以减少器件的电流应力。介绍了Boost在交错并联结构下的工作原理,采用了自适应导通时间的谷值电流模式控制策略,并采用II型补偿加快了系统的响应时间。基于Simplis搭建模型并仿真,通过软件仿真证明了该控制方式是可行的;设计并做出了一款微型电源模块,内部包含两路Boost电路,每路可单独运行亦或两路工作在交错并联模态。该电源模块因其控制策略和开关管集成在硅芯片上,所以模块小、质量轻,输出端电压波动范围小,峰值转换效率可达90%。

The staggered parallel Boost converter combined with the current mode control mode can not only realize the current flow between the phases,but also reduce the current stress of the device.This article systematically introduces the working principle of Boost under the staggered parallel structure,adopts the valley current mode control strategy of adaptive conduction time control,and adopts type II compensation to accelerate the response time of the system.Based on Simplis,a model was built and simulated,and the feasibility of this control method was demonstrated through software simulation.We have designed and developed a miniature power module that includes two Boost circuits,each of which can operate independently or operate in interleaved parallel mode.The power module is small,lightweight,and has a small range of output voltage fluctuations due to its control strategy and switch tube integration inside the chip.The peak conversion efficiency can reach 90%.