Optimal Design of Supercapacitor Stacks for Size-critical Applications
Power processing applications with large transient requirements employ supercapacitors (SCs) as compact energy storage. The miniaturization of SC stacks facilitates their inte gration into such systems, especially when size constraints are to be met. Existing design guide lines for SC stacks do not
clearly address the minimization of stack size considering the simultaneous requirements of power and energy. In this paper, a size-optimal discharge ratio (SODR) is derived to reduce the size of SC stacks while meeting the power and energy demands of an application. A design approach for SC stacks, capable
of accommodating SC parameter variations, is outlined based on the proposed SODR. The SODR is also compatible with existing design approaches. Using the SODR, backup durations suitable for SCs are quantified in comparison with other storage technologies. The optimality of the SC stack size achieved by the proposed SODR-based design method is validated through circuit simulation and in experiments on a fabricated SC stack.
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