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Current sharing between diode clamps of polar capacitor bank

The layout of a capacitor bank with clamping diodes is investigated based on an experimental 5.5 kJ energy storage unit for pulse power applications. While the current sharing between parallel connected capacitors is good, it is not the case with parallel connected clamping diodes. Despite a very low inductance busbar and attention to symmetrical layout, unequal current sharing results. Good agreement was obtained between measured waveforms and a detailed simulation model. The simulation model indicated that the unequal current sharing is due to small differences between the coupling factors of capacitors batteries at the ends and the middle of the bank. It is concluded that the best solution is to place the parallel diodes as close as possible to each other at a position where best averaged coupling is achieved with the individual capacitors of the bank.