Optimum placement of high energy inductors for capacitive pulse power supplies

Electromagnetic launcher (EML) systems convert electrical energy into mechanical energy. A large amount of energy must be supplied in a short time period to provide the necessary acceleration for the projectile. This type of energy is generally provided by capacitive pulsed power supplies (PPS). Many PPS units are connected in parallel to increase the total energy. Each module of a capacitive PPS includes high energy capacitor, shaping inductor, and semiconductors. The shaping inductors are air-core type inductors that are used to limit maximum current of the module. Since the shaping inductors of different modules are placed close by to achieve a compact design, their magnetic fields affect each other. If this magnetic coupling leads to a high enough negative induced voltage in non-conducting modules, the freewheeling diode may fail if the particular module is fired as the diode is open. Thus, protection systems that avoid the activation of a modules while their diodes are in conduction are used in EML systems. The protection system avoids the fault but decreases the energy of the supply. This study proposes a design methodology that determines the positions and orientations of shaping inductors as well as the switching sequence to avoid semiconductor fault with a compact power supply. The design starts by determination of the physical dimensions of possible inductors with the desired inductance value and also capable of withstanding lateral electromagnetic forces by using 2D finite element analysis (FEA) simulations. The distances between the inductors are determined by an iterative approach by considering the different pre-defined placements. In this method, 3D FEA models are used to calculate the inductance matrix, which are used to estimate the induced voltages in other inductors and also in the system level simulation models. Finally, an optimum switching algorithm is presented that selects the most appropriate module firing sequence for a switching sequence.


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Citation Formats
İ. GÜNGEN, “Optimum placement of high energy inductors for capacitive pulse power supplies,” M.S. - Master of Science, Middle East Technical University, 2021.