Wednesday, March 09, 2016

Electric double layer capacitor an eFlywheel

The Electric double layer capacitor has the main use of a Charge Reservoir. That means a large amount of electrical charge in a small footprint.

These charge/discharge quickly unlike the battery, There is no Electrical Energy to Chemical Energy Transformation and back, like in batteries. It may need caution in design and usage as they may carry a lot of punch.

Electric double layer capacitor an eFlywheel

Also known as Ultracap, Goldcap, Supercap - Electric double layer capacitor, In Farads, like batteries, Energy Reservoirs or eFlywheel.

In Product Safety terms; The Battery has a Internal Resistance, but a Supercap does not. When used in Values like 100F and is fully charged, an Internal or External Breakdown of Insulation or Short Circuit may Occur. The Heat Generated is Enormous. Murphy's Law says such things happen..

Supercap at Wikipedia

Electric Double Layer Capacitor (EDLC) or SuperCapacitor

DLCAP - Electric Double Layer Capacitor - Nippon

They have a range of Supercapacitors upto 2500F at 2.5V and Modules like 400F and 15V. There are two types Prismatic and Cylindrical. In comparison to batteries - multi-million cycles of charge-discharge is possible.

EverCAP - Double Layer Capacitors - Nichicon

They have two types, High Power Density for a large current discharge. High Energy Density for a long backup time. Over a million Charge/Discharge cycles. High Efficiency. Capable of fully discharging to zero volts.

Some things to note for a design engineer. The EDLC or Electric Double Layer Capacitors ...
  • Specified Endurance and end of life.
  • Excess Vibration can alter Specs.
  • Caution - The maximum temperature.
  • Specs are dependent on Temperature.
  • Maintain Low ripple current on Charge/Discharge.
  • It is Polarized like a Electrolytic cap.
  • Not Hot parts or Heatsink near cap.
The Double Layer Capacitors developed by WIMA are storage capacitors with highest capacitance values in the Farad range.

GTO Capacitors - WIMA

They are among others suited to serve as batteries, can deliver considerably higher currents for a short time, however, and are maintenance free.

SuperCapacitors - WIMA - These EDLC supercap has one-tenth of energy, but delivers over 10 times of power due to ultra low ESR. In Comparison with a Battery. A Lifetime of over 500,000 cycles.

Xelled Supercapacitor - Vinatech

Some Specs
  • Rating 2.5V / 2.7V
  • High power density (low internal resistance)
  • High electrical current, instant power back-up applied

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