Also found in: Dictionary, Thesaurus, Medical.


A capacitor that has much greater energy density and power per pound than electrostatic and electrolytic capacitors. Used in myriad electronic circuits as well as hybrid and electric cars, ultracapacitors are also called "supercapacitors."

With a life cycle of more than a million charges, ultracapacitors are ideal for applications that require frequent, fast charges and discharges, such as hybrid vehicles that are constantly braking and accelerating. However, since they have much less energy density than storage batteries, they do not serve as a long-term energy source.

Ultra Thin Separation Layer
The separation area between the positive and negative electrodes was reduced from millimeters in electrostatic capacitors to microns in electrolytic capacitors to nanometers in ultracapacitors. Thus, the ratio of surface area to separation layer in ultracapacitors is orders of magnitude greater than its predecessors. See capacitor.

A Hybrid Vehicle Application
Maxwell's BOOSTCAP (top image) is a soda can-sized ultracapacitor used in multiples. The size of a coffee table, the 390 volt hybrid bus module (bottom image) holds 144 BOOSTCAP ultracaps that are charged when the bus is braked and discharged when it accelerates. (Image courtesy of Maxwell Technologies, www.maxwell.com)

D-Cell Sized Ultracaps
This Maxwell BOOSTCAP is the size of a flashlight D-Cell. With pins for circuit board attachment, they are used in multiples for numerous applications such as smoothing out incoming power to telecom equipment and turning a windmill into the wind. Smaller BOOSTCAPs are used to power wireless readings from utility meters. (Image courtesy of Maxwell Technologies, www.maxwell.com)
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
Mentioned in ?
References in periodicals archive ?
The company's ultracapacitor products provide power solutions for applications in consumer and industrial electronics, transportation, renewable energy and information technology.
There are many possible topologies of DC-DC converters which interface the ultracapacitor and the DC link.
The parameters are as follows: U represents the effective back-electromotive force (EMF); i denotes the circuit current; [L.sub.w] and [R.sub.w] are the equivalent inductance and resistance of the three-phase windings, respectively; [L.sub.bc] denotes the inductance of the boost converter's inductor; [U.sub.c] represents the terminal voltage of the ultracapacitor.
Skeleton Technologies ultracapacitors will be used in the hybrid propulsion system.
By using a sufficiently long fixed duty cycle and a large ultracapacitor we should be able to obtain sustainable operation for over a year, the longest period of continuous operation under real conditions reported among [1,11].
However, the pores of activated carbon in an ultracapacitor have a complex branch pore structure for which any impedance analysis model should account.
Auto Business News-December 13, 2012--Automobili Lamborghini SpA to equip Maxwell ultracapacitors in Aventador(C)1994-2012 ENPublishing - http://www.enpublishing.co.uk
To create an entire pitch control system, each blade requires its own ultracapacitor.
The Office of Naval Research has given funding to several universities so they can improve the specific energy of these electrochemical ultracapacitor systems.
The midsized truck with the ultracapacitors and Hydrogenics fuel cell operates a little differently.
will be offering a 75-volt BOOSTCAP ultracapacitor module to help meet backup power and power quality requirements of wind turbines and other renewable energy generation and industrial equipment applications.