Influence of nonuniform charging on flat of output square-wave pulse of pulse forming system

When a pulse forming line (PFL) is being charged, the voltage will be not the same on the PFL for the short charging time and certain length of the PFL. Therefore, the output voltage on the load resistance is also changed. This is researched in theory and simulation in this paper. First, the mechanism of nonuniform charging is studied, and output voltage is calculated in this situation based on the telegraph equation with the initial condition of nonuniform charging. Then, the circuit simulation is carried out to verify the results of theoretical analysis. It is shown that, the flat of the output voltage turns to be up-and-down due to nonuniform charging.