矿用本安电源开关变换器滤波电容消解方案

针对矿用本安电源因开关变换器滤波电容较大而导致输出电压纹波较大、本安性能较差等问题,提出采用有源电容技术消解本安电源开关变换器滤波电容的方案,对有源电容的工作原理、控制策略和数学模型进行了分析.有源电容技术通过控制内部全桥变换器,将直流母线瞬时功率差转移给非直流母线电容进行能量平衡,从而实现直流母线滤波电容容量消解.以基于Buck变换器的电源为例,介绍了有源电容技术在矿用本安电源中的应用,并通过仿真和试验验证了采用有源电容技术可以较小的电容达到输出本安要求.

Filtering capacitor resolution scheme of switching converter in mine-used intrinsic safety type power supply

For problems of large output voltage ripple-wave and poor intrinsic safety performance existed in mine-used intrinsic safety type power supply caused by large filtering capacitor of switching converter, a filtering capacitor resolution scheme was proposed by use of active capacitor technology. Working principle, control strategy and mathematical model of the active capacitor were analyzed. The active capacitor technology transfers instantaneous power difference of DC bus to a non-DC bus capacitor for energy balance through controlling an internal full-bridge converter, so as to realize filtering capacitor resolution of DC bus. Application of the active capacitor technology in mine-used intrinsic safety type power supply was introduced by taking a power supply based on Buck converter as an example. The simulation and experiment results show that the active capacitance technology can meet intrinsic safety output requirement with small capacitor.