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Tuesday, October 25 PQS 01 How Do Ultracapacitors Fit Into Your Power Quality Design 8:30 am-9:30 am The challenge how to design ultracapacitors into high reliability applications. The purpose of this paper is to provide design considerations and guidelines for the balance of system when using ultracapacitors as the primary energy storage component for power back-up to achieve high reliability. Because the ultracapacitor is a relatively new commercial device and it’s characteristics are unlike capacitors or batteries, designers and system engineers need to know design parameters that are critical in ensuring a high reliability system. The paper will review five key areas to consider and parameters that are important when designing in ultracapacitors as the primary energy storage device, particularly for higher voltage, higher power applications. Individually each ultracapacitor cell has very high capacitance and very high power density, however, each cell has a limiting voltage factor that is critical and not very practical for anything other than circuit board level applications. The typical voltage maximum for each cell is around 2.5 volts DC. Therefore, for any application beyond a circuit board level ultracapacitors must be placed in a series configuration to achieve higher more useable DC bus voltages for higher power applications. The paper will describe how to accomplish this up to hundreds of volts DC while ensuring reliability is not compromised. The paper will review and provide important parameters for five key areas of design consideration; ultracapacitor interconnection and packaging, ultracapacitor balancing, ultracapacitor charging, ultracapacitor DC control and ultracapacitor system integration.
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