Simulation research on long pulse parallel resonant modulator

This paper presents a long-pulse modulator based on parallel resonant waveform superposition technique, which uses multiple modules (in parallel) for waveform superposition to reduce rising edge while keep a certain voltage ripple and increase the output power, with each module using a parallel resonant structure. In order to stabilize the output voltage, and to minimize switching losses, the frequency and phase combined control method is applied. Its principle, feedforward voltage control principle and design of resonant parameters are described. The simulation of three modules in parallel shows that, with the input DC voltage varying within 450 to 550 V, the structure under forward control at 50 kHz resonant frequency generates 60 kV voltage on the 5.2 kΩ load resistor, whose rising ti