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Because it possesses higher current turn-off capability, the inverse current commutation with semiconductor devices (ICCOS) is a better option for the opening switch of an inductive pulsed power supply than the integrated gate commutated thyristor. This paper investigates the counter-current capacitor, which is the key component that determines the turn-off result and the volume of the counter-current branch. The major contributions of this paper include the following: 1) deriving an analytical expression for the minimum precharged capacitor voltage that can reliably turn off the main switch; 2) verifying this expression through a series of experiments within a current range of 0 to 4000 A and an energy range of 0 to 50 kJ; 3) giving an approximate expression for the optimal capacitance that minimizes the precharged energy; and 4) investigating the variation trends of the optimal capacitance and the corresponding optimal precharged energy with varying inductor current. [ABSTRACT FROM PUBLISHER]

The major strengths of inductors in energy density and power density make an inductive pulsed power supply (IPPS) a promising option for pulsed power supplies in an electromagnetic launch system. Among the circuits for an IPPS, the capacitor-aided meat grinder circuits constitute an important branch. An analytical method for the working processes of these circuits is proposed in this paper. The core of this method is the decoupling of a high-order circuit into the superposition of a resistor–inductor first-order equivalent subcircuit and a resistor–inductor–capacitor second-order equivalent subcircuit. The validity and accuracy of this method have been verified through comparison with a numerical simulation. The results show that this method possesses both satisfactory accuracy and excellent computational speed. With the same circuit parameters and time step, the time cost of this method is three orders of magnitudes lower than the time cost of a numerical simulation. Moreover, this method contributes to more intuitive understanding and more essential insight into the working principles of the capacitor-aided meat grinder circuits. [ABSTRACT FROM PUBLISHER]

The meat grinder with SElf-charged Capacitor and Thyristors circuit is a novel circuit for inductive pulsed power supplies. The energy transfer capacitor is one of the key components in this circuit. And its capacitance C and the precharged voltage UC are key parameters worth investigating. The circuit working process and corresponding numerical calculation method are briefly introduced. And the method validity is verified through experiments. Then, the influences of $C$ and UC on circuit performance indices, i.e., the maximum voltage across the main switch $V_{{\mathrm{sopm}}} , the secondary current multiplication factor m2 , the ratio of the maximum capacitor energy over the inductor charging energy \eta C , and the self-recovery rate of the precharged capacitor voltage k\mathrm{UC} , are quantitatively analyzed through parameter sweep. Generally speaking, large C is conducive to lower $V_{{\mathrm{sopm}}} ; small m2 ; small C and low UC are conducive to lower \eta C and higher $k_{{\mathrm{UC}}}$ . Moreover, the analytical expression of $k_{{\mathrm{UC}}}$ is given. With C and UC elaborately selected, $k_{{\mathrm{UC}}}$ can achieve 100%. In addition, the balance relationship between two contradictory indices $V_{{\mathrm{sopm}}}$ and $k_{{\mathrm{UC}}}$ is obtained by solving a biobjective optimization problem and using the genetic algorithm. [ABSTRACT FROM AUTHOR]

The air-core flat spirals of strip coil structure is a typical type of the tightly coupled energy storage inductors used in inductive pulsed power supplies. This paper improves the speed and the parameter scope of the inductance calculation method for these inductors. Specifically, the analytical expressions using the structural parameters to represent the performance parameters, e.g., the inductance, the resistance, and the current conducting capability of the primary inductor and the secondary inductor L1 , L2 , R1 , R2 , I\mathrm{ 1limit} , I\mathrm{ 2limit} , the total volume V\mathrm{ tot} , and the energy density \omega , are given. The validity of this method is confirmed by practical measurements of a set of constructed inductors with 2.67-mH total inductance. The absolute error is within 0.02 mH. On the basis of this method, parameter optimization on energy density is conducted for the 70-kJ energy level module. Results show that the energy density can reach 11.2 MJ/ \text{m}^{3} when the total inductance is 5.07 mH and the total volume is 6.3\times 10^{-3}~\text{m}^{3}$ . [ABSTRACT FROM AUTHOR]