交错并联磁集成Buck变换器的输出本质安全研究

Research on the Output Essential Safety for Interleaving Magnetics Buck Converter

为了使电路能以较小的最大输出短路释放能量满足本质安全要求,提出将交错并联磁集成技术应用到传统Buck变换器中,交错并联能有效减小输出总电流纹波,磁集成能有效减小单通道电流纹波。以双通道交错并联磁集成Buck变换器为例进行研究,分析了电路的工作原理和临界电感,CCM和DCM下的电感电流纹波,并进行了输出本质安全判据;最后对所设计的电路进行仿真证明理论分析的正确性,并用试验加以验证。

In order to meet the essential safety requirements that the max released energy of the output short circuit is less in the buck converter, the magnetic integration technique was applied to the interleaving buck converter. The interleaving can reduce the total output current ripple and magnetics can reduce the single current ripple. Taking two-interleaving magnetics Buck converter for example, the working principle of the circuit, the critical inductance, the current ripple under CCM and DCM and the output essential safety criterion were analyzed respectively. Finally, the simulation and the experiment prove the correctness of the theoretical analysis.