High frequency high turn ratio pulse transformer coupled hard tube solid-state modulator

High frequency high turn ratio pulse transformer coupled solid state hard tube modulator was developed, the output voltage was 70 kV, and the output current was 12 A. The output pulse had two modes for 10 s and 200 s, when the output pulse was 10 s, the work frequency could adjust from 0 to 8 kHz; when the output pulse was 200 s, the working frequency could be adjusted from 0 to 400 Hz. The modulator was very compact, the overall size was 947 mm1127 mm1350 mm. The paper gave a brief overview of its components and working principle, focusing on the driver for IGBT solid switch, protection of the circuit and the power loss. Experiments were carried out to test the modulator , the pulse leading edge was 2.2 s, pulse trailing edge was 1.65 s, overshoot was smaller than 7%, the flat top was less than 1%, and the system was reliable and stable.