Optimizing Efficiency in White LED Backlight Applications
Tags: CAPACITORS; CASCADE converters; LIGHT emitting diodes; ENERGY storage; ELECTRIC capacity; ELECTRIC apparatus & appliances; ELECTRODYNAMICS
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With system voltages dropping, load currents rising, and clock rates increasing, effective power management is now crucial to system performance. To optimize an application, the designer must add capacitors between the converter and the specific load. Optimizing the converter-load interface...
- Build a precise dc floating-current source. Ram�rez, D.; Casans, S.; Reig, C.; Navarro, A. E.; S�nchez, J.; Thompson, Brad; Granville, Fran // EDN Europe;Oct2005, Vol. 50 Issue 10, p73
Presents designs for a precise direct current floating-current source. Classic generalized impedance converter (GIC) that provides a single-port impedance; Replacement of all of the impedances of a generalized impedance converter with resistors to create a constant-current source; Ability of GIC...
- Hybrid Ultracapacitor Offers Best of Both Worlds. Murray, Charles J. // Design News;Feb2011, Vol. 66 Issue 2, p32
The article discusses aspects of hybrid ultracapacitor. The author mentions that hybrid capacitor offers twice the energy density of conventional ultracapacitors. He discusses the ability of the combination between ultracapacitors and lithium-ion batteries, the hybrid ultracapacitor, to charge...
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- Capacitance of spherical dielectric layers. Topasna, G. A. // Journal of Applied Physics;7/15/2006, Vol. 100 Issue 2, p024501
A capacitor device is modeled consisting of a close-packed arrangement of spheres as the dielectric layer. The top electrode is deposited directly on the upper half of the top layer of spheres and bottom electrode is a flat conductor. Expressions are derived for the capacitance for both single...
- Sidewalls contribution in integrated three-dimensional Sr0.8Bi2.2Ta2O9-based ferroelectric capacitors. Menou, N.; Turquat, Ch.; Madigou, V.; Muller, Ch.; Goux, L.; Lisoni, J.; Schwitters, M.; Wouters, D. J. // Applied Physics Letters;8/15/2005, Vol. 87 Issue 7, p073502
As compared to usual planar capacitors, three-dimensional (3D) ferroelectric capacitors display a large polarization increase due to the additional electrical contribution of the capacitor sidewalls. However, in 3D capacitors the polarization increase with respect to the planar geometry is lower...
- The Trouble With Capacitors--Part 1. Fehr, R. // EC&M Electrical Construction & Maintenance;Dec2003, Vol. 102 Issue 12, p14
Part I. Discusses the use of switch load capacitors. Mechanics of normal electrical load switching; Activation of capacitive load; Reasons for using capacitors in electric systems. INSET: Why We Use Capacitors.
- 15-V Ultracapacitor Packs. // Power Electronics Technology;Jan2005, Vol. 31 Issue 1, p10
Introduces a series of 15-V BOOSTCAP ultra-capacitor packs and modules developed by Maxwell Technologies using the previous developed D-cell packaged ultra-capacitor. Product features; Physical description; Pros and cons; Mechanical efficiency; Systems requirements.
- Treasures Ahead For Those Seeking Joules. Morrison, David // Power Electronics Technology;May2006, Vol. 32 Issue 5, p8
The article presents the author's view on improvements in the performance level of capacitors. It includes information on advancement of different electrolytic and electrostatic capacitor types and assessed their influence on power-supply applications. The author insists that market demands...
