基于五级电荷泵能量收集的电流互感器取能电源

A Current Transformer Energy-obtaining Power Supply Based on Five-level Charge Pump Circuit

针对现有电流互感器取能电源存在供电死区的现象,提出了一种可适应较小电流电力母线的电流互感器取能电源供电方案。在分析电源取能原理的基础上,建立了电流互感器取能电源的电路模型,并推导了电源取得最大功率的条件。选择高饱和磁感应强度的硅钢材料作为铁芯,设计了五级电荷泵电路、能量收集电路以及电源管理电路。基于所提出的方案研制了样机,以无线测温模块作为负载,对样机整体进行了测试。实验结果表明,当电流在1~1 000A范围内时,电源工作于非饱和低热耗状态。

In view of the feed dead zone using the current transformer as power source,a current transformer power supply scheme for low current power line is proposed.A circuit model for power supply is developed based on the electromagnetic induction theory,and the relationship between the output power,output voltage,load condition,magnetic coil turns,and core parameter is analyzed.Silicon steel with highly saturated magnetic flux density is selected as the magnetic core.Then,a five-level charge pump circuit,an energy harvesting circuit and a power management circuit each are designed.Finally,power supply equipment is developed based on the scheme aforementioned,and tested using the wireless temperature measuring module as the load.Experimental test shows that the power supply provides stable outputs with no saturation and low heat consumption when the bus current is 1~1 000 A.