基于自适应限流电流互感器取能电源设计方法

Design Method of Power Supply for Current Transformer Based on Voltage Comparison

针对输电线路电流大小大范围波动导致在线取能装置能量溢出的问题,通过在电流互感器直流侧增添泄能电路,利用泄能电路的电流值对取能负载进行限流。首先在分析电流互感器取能原理的基础上建立取能负载模型,推导出负载电压与电流互感器母线电流的关系。通过引入开关电路,由脉冲信号与电流比较器结合产生的信号控制晶体管的导通与关断,从而解决电流过大时能量溢出的问题,给出了稳压电路的实现形式,建立整个装置的等效模型。同时建造试验平台,证明了该方法能够在母线电流变换的条件下达到自动调节取能负载电压的效果,从而有效地改善取能装置在大输入电流下的能量溢出状况,可见所提方法的可行性。

Aiming at the problem of energy overflow of the online energy acquisition device caused by the large-scale fluctuation of the current of the transmission line,a bleeder circuit was added on the direct current(DC)side of the current transformer,and the current value of the bleeder circuit was used to limit the current of the energy-absorbing load.Firstly,based on the analysis of the principle of current transformer energy extraction,an energy extraction load model was established,and the relationship between the load voltage and the bus current of the current transformer was derived.By introducing a switch circuit,the signal generated by the combination of the pulse signal and the current comparator controls the turn-on and turn-off of the transistor,thereby solving the problem of energy overflow when the current is too big.Realization form of the voltage stabilizing circuit was given,and the whole device was established equivalent model.At the same time,a simulation test platform was built to prove that the proposed method can achieve the effect of automatically adjusting the voltage of the energy extraction load under the condition of the bus current conversion,thereby effectively improving the heating condition of the energy extraction device under a large input current.It can be seen that the proposed method is feasible sex.