【摘要】 在开关电源中存储和传递直流功率,会在磁件铁心中产生较大的直流偏磁,限制了磁件铁心利用率和电源性能的提高。本文依据消除直流偏磁的思想,提出了利用移相控制策略消除直流偏磁的控制理论,并把该控制策略应用于双通道交错并联型Buck变换器的耦合电感,提出了两种控制方式,并分析了变换器的在两种控制方式下的工作过程,通过仿真和实验表明,集成磁件在磁路不存在气隙的结构下消除了直流偏磁,验证了该控制策略的实用性。更多还原

【Abstract】 There is a big DC-bias in the core of the magnetics storing and transfering DC power in switched power supply, which restricts the increase of the core’s utilization ratio and the improvement of the power supply’s performance. On the basis of the idea of reducing and eliminating DC-bias, this paper proposes an theory of eliminating DC-bias by phase-shifting control strategy, and it is applied to the coupling inductance of two-channel interleaving buck converter. By two types of control mode presented, the operation process of the converter is analyzed. Finally, simulation and experimental results indicate: the structure that there isn’t air gap in magnetic circuit of integrated magnetics may eliminate DC-bias. The control strategy is practical.更多还原