System Implementation and Testing of the STRETCH Meat Grinder With ICCOS


By applying the principle of inverse current commutation with semiconductor (ICCOS) devices in an exceedingly slow transfer of energy through capacitive hybrid (STRETCH) meat grinder system, a completely unique circuit topology known as STRETCH meat grinder with ICCOS was proposed by the Tsinghua University in 2013. It can not only raise the amplitude of the opening current, but also reduce the cost of the STRETCH meat grinder circuit obviously by replacing the integrated gate-commutated thyristor (IGCT) with thyristor. This paper discusses the general style, system implementation, and testing results of a STRETCH meat grinder with ICCOS system with roughly one-kJ inductive energy. The load is a spiral coil with one.4- resistance and one.4- inductance. With closed-loop control strategy, the system detects the charging current of the inductors. When it reaches the designated price, the triggering signal for ICCOS is delivered and after the predefined delay time, the triggering signal for discharging the voltage on the pulse-forming capacitor is delivered. The current of the inductors and also the load are measured by Rogowski coils. The opening current is 1 kA and the most load current is shut to 4 kA. All the voltages on the switches are under 1 kV. The experimental results are in line with the simulated ones, which verified the correctness of the theoretical analysis and proved the applicability of the STRETCH meat grinder with ICCOS for larger energy level.

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