摘要
电流互感器取能技术是解决高压输电线路实时监测设备供能的较好方式,但其存在热耗大、整流后电压变化范围大的问题。为此文中提出一种新型变换器式取能电路,采用取能线圈和辅助线圈2个绕组,利用磁链守恒和开关电源的脉宽工作特性,使取能绕组整流后的电压受闭环控制得到稳压。该取能电路设计简单、取能绕组输出功率大、整体效率高。文中对取能电路的原理进行了分析,给出磁感应强度、电流、绕组匝数的计算公式,对电路进行了仿真,并通过一个2.5W的原理样机进行了实验验证。
The draw-out power circuit in current transformer is a better way of supplying power for on-line monitoring system in high voltage side of transmission lines. But the circuit has disadvantages of high heat loss and large variation range of rectified voltage values. To deal with these problems, a novel converter draw-out power circuit utilized in two transformer coils is proposed. It can regulate the rectified voltage based on operating characteristics of flux-conservation and pulse width modulation. The circuit is characterized by simple design, high output power of draw-out coil and high efficient. The principle of the circuit is described, relevant parameters are calculated, and the circuit is simulated. At last, a 2.5 W prototype of forward converter is built and tested.
出处
《电力系统自动化》
EI
CSCD
北大核心
2013年第12期109-113,共5页
Automation of Electric Power Systems
关键词
变换器
取能线圈
铁芯饱和
磁链守恒
稳压电路
converter
draw-out power coil
magnetic core saturation
flux-conservation
voltage regulator circuit
