Pulse power switch centered on SCR for the launch system

The phase control thyristor is adopted as the block switch for the linear induction motor of the launch system. However, both the static and dynamic parameters of the thyristor are diffused, i.e., the gate trigger voltage and current, the holding current, the on-state voltage drop, the leakage current, and the circuit-commutated turn-off time, which will give direct influence to the development and application of the block switch of the launch system. Some measures to reduce the bad effect induced by the diffusion characteristics of these parameters are proposed. The method of screening specification, the design criterion of the width, the peak, and the modulation frequency of the drive pulse for the thyristors are provided centered on the experimental results, which will give help to the construction of the block switches of the launch system.