A solid-state bipolar pulse adder based on phase-shifted control

A newly developed bipolar high-voltage pulse adder with a novel control method is proposed in this paper. The system adopts modularization design; typical full-bridge semiconductor unit is the basis of each stage. Owe to the phase-shifted control method, the pulse adder has the ability of generating fast narrow bipolar high-voltage pulses. The flexible operation of full-bridge units is fully utilized to solve the problems caused by stray capacitance using phase-shifted control method A laboratory prototype was assembled with 6 stages and each stage was composed of IGBTs. The adder can generate 5 kV bipolar pulses with tens of nanoseconds pulse width, and both rise time and fall time are less than 40 ns, the repetition rate is up to 1 kHz. The experimental results are shown in the paper and discussed at last.