Active droop compensation circuit for solid state pulsed power modulator with long pulse width

In this paper, voltage droop compensation associated with long pulses generated by solid state pulsed power modulator (SSPPM) is discussed. The pulse modulator with proposed compensation circuit can achieve low voltage droop in many applications required long pulse width regardless of load condition by using active droop control. The proposed circuit is composed to current source capacitor charger based on resonant converter and flyback converter for discharging output capacitor. The series resonant converter with discontinuous conduction mode (SRC_DCM) operation is adopted for capacitor charger topology due to two reasons. SRC_DCM has current source characteristic so that it can easily make triangular waveform that is useful to compensate voltage droop. Moreover, voltage gain curve of SRC_DCM is proportional according to switching frequency. It is appropriate for active droop control that requires adjusting output peak voltage linearly according to load condition. For pulling down the output voltage before next pulse applied, the flyback converter is used. It can regenerate output capacitor energy to input capacitor as well as discharging output voltage. The circuit configuration, relevant analysis results, and a pspice modeling are presented and verified by 1kV, 200Hz, 300us prototype.