中文摘要：

双向DC/DC变换器普遍存在轻载效率偏低的问题,针对这一难题提出了变换器最优工作相数控制策略,即根据负载的减小程度,适当减少工作相数,以消除未工作相的所有损耗,提高变换器轻载效率。分析变换器轻载时损耗,推导出效率计算公式。针对轻载减少工作相数会引起总输出电流纹波恶化的问题,提出采用交错并联磁集成技术,将四个分立电感集成为两个耦合电感以减小电感开关器件的相电流纹波,降低损耗,并结合移相控制和滤波电容设计进一步消除轻载切相后输出纹波增大的影响,最大程度降低其轻载工作损耗,实现变换器全负载范围高效率运行。仿真和实验证明所提出的轻载效率优化策略的正确性及移相加磁集成最优工作相数控制策略的有效性。

英文摘要：

In bi-directional DC / DC converter there exists the problem of low efficiency at light load. In order to solve this problem,the optimal working channel converter control strategy is put forward. As load level is decreased,the number of working phases is decreased accordingly so as to eliminate the losses in the phase that are not working and to increase the efficiency at light load. The formula of efficiency calculation is deduced at light load. In view of the ripple deterioration of output current at light load,staggered parallel magnetic integration technology is presented in the paper,in which four discrete inductors are integrated into two coupled inductors to reduce the ripple of current and losses. Moreover,the ripple is further decreased by phase shifting control and redesign of filter capacitor to realize high efficiency at both light and full load operation. Simulation and experiment prove the correctness of the proposed strategy of the paper.