www.we-online.com SUPERCAPACITORS 29 www.power-mag.com Issue 1 2024 Power Electronics Europe dashed line shows the theoretical discharging behaviour and a solid red line shows the actual measured data. Supercapacitor blueprint The circuit presented, with its charging and discharging behaviour, can serve as a blueprint for many applications in which “super” double-layer capacitors are to be used for short-term energy supply. It was shown that discharging with a step-up converter can be described very well as a discharging process with constant power. Capacitors are particularly suitable as energy storage devices, if it is possible to define exactly what power is required for what period of time. Hot swap is a typical scenario here. More and more devices are classified as smart in that they have an operating system that should not be shut down and restarted with a change of power supply. Data loss or interruption of a wireless connection due to an interruption of the power supply can also be an argument in favour of a supercapacitor design. Such solutions are not only robust and technically easy to implement, but, as can be seen from the charging time, are quickly ready for use again. www.we-online.com RIGHT Figure 4: Voltage (top) and current (bottom) characteristics for the supercapacitor for constant power discharge. To receive your own copy of subscribe today at: www.power-mag.com LEFT Figure 5: The complete application with the different power converters, the supercapacitor bank and the load (different voltage source than in the schematic representation).
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