High-voltage pulsed electric field technology is a new type of non-thermal food processing technology

of which the treatment performance is determined by the output pulse parameters. The relationship between the output waveform and the damping coefficient of bipolar square pulse PEF system was studied based on the IEEE pulse transformer equivalent parameter model. The effects of the load impedance and loop parasitic parameters on the system damping coefficient were studied. Theoretical and experimental results show that the damping coefficient of PEF system increases with the decrease of the load impedance

and the pulse rise time increases. Loop parasitic parameters increase the damping coefficient σrsys and then the pulse rise time. The RCD clamp circuit of the pulsed forming system changes the energy release channel of the system distribution parameters. When the σfsys decreases

the fall time of the output square pulse will increase. The experimental results prove that the system damping coefficient has an important effect on the output square waveform characteristics of PEF system

and relevant influence parameters should be considered to obtain an optimal square pulse.