Design of the solid-state high voltage pulse Marx modulator for gyro-TWT

This paper designs a high voltage rectangle pulse Marx modulator for gyro-TWT. The output voltage is 70 kV, the output current is 15 A, the frequency could be changed in 2 kHz, the pulse width could be changed in 200 s and the power capacity is up to hundreds kW level. The Marx modulator takes two IGBTs in series as the controlling switches. The FPGA board is used in controlling the switches and protecting and monitoring circuits. The delay compensation circuits are also controlled automatically by FPGA board and make the output pulse flat-top 1%. The prototype simulation and experiments of solid-state Marx modulator have been completed and proved the feasibility of the design. The result is useful to provide a stable and high frequency rectangle pulse, reduce the volume and the maintenance charge and be the foundation of high voltage experiments.