Supercapacitors (or ultracapacitors) are fi nding their way into an increasing number of applications for short-term energy storage and applications that require intermittent high energy pulses. One such application is a power ridethrough circuit, in which a backup energy source cuts in and powers the load if the main power supply fails for a short time. This type of application has typically been dominated by batteries, but electric double layer capacitors (EDLCs) are fast making inroads as their price-per-farad, size and effective series resistance per capacitance (ESR/C) continue to decrease.Supercapacitors Can Replace a Backup Battery for Power Ride-Through Applications Design Note 450 Jim Drew Introduction Supercapacitor Characteristics Supercapacitors (or ultracapacitors) are nding their way A 10F, 2.7V supercapacitor is available in a 10mm × into an increasing number of applications for short-term 30mm 2-terminal radial can with an ESR of 25mΩ. One energy storage and applications that require intermittent advantage supercapacitors offer over batteries is their high energy pulses. One such application is a power ride- long lifetime. A capacitor’s cycle life is quoted as greater through circuit, in which a backup energy source c……