Abstract: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 is added on the DC side of the current transformer, and the current value of the bleeder circuit is used to limit the current of the energy-absorbing load. First, founded on the analysis of the principle of current transformer energy extraction, an energy extraction load model is established, and the relationship between the load voltage and the bus current of the current transformer is 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 is given, and the whole device is established. Equivalent model. At the same time, a simulation test platform was built to prove that the 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.