Study on the collaborative triggering of multiple STRETCH meat grinder with ICCOS modules

The energy density of the inductive energy storage systems is one order of magnitude higher than that of the capacitive ones. The STRETCH meat grinder with ICCOS put forward by Tsinghua University is a typical inductive pulsed power supply for electromagnetic launch system, which has remarkable current amplification ability as a single module. But one module can not provide enough amplitude and width for the load current of the railgun launching. So the collaborative work of multiple inductive source modules is necessary. In this paper the designed inductive power supply system of about 1MJ is composed of 40 STRETCH meat grinder with ICCOS modules. All the main switches are opened simultaneously to reduce the magnetic field coupling among the modules and make the current rising edge steep. The modules are divided into groups. The triggering delays of the thyristors between every two adjacent groups are carefully designed. After the first period triggers for all the modules, the energy stored on the capacitors can be further utilized with the second period triggers. The numerical analysis and the simulation results show that the appropriate collaborative triggering delay can increase the adjustability of the output current width and the second period triggers can further increased the current width and increase the system efficiency. So the load current with flat shape, appropriate amplitude, and longer duration can be provided with modular design and collaborate triggering discharge of multiple modules. This can provide a theoretical foundation for the future study and implementation.