Paper Capacitors

Posted by Tomáš Zedníček
On January 27, 2021
0

Because paper is porous it has to be impregnated in order to prevent corona effects and flash-overs. It is done by use of melted wax or different kinds of oils, among other things mineral and silicone oils. The oils increase the tensional stability but decrease to a certain extent the εr. A fibrous paper has a εr ≈ 6.6 and the mineral oil ≈ 2.3 which gives the impregnated winding a εr varying between 3.1 and 4.5. The differences depend above all on the winding pressure produced by the tensile force during winding.

EEE Components, PASSIVES

Performance, reliability and limitations of BME tech

Posted by doEEEt Media Group
On November 8, 2020
0

The BME technology allows the fabrication of capacitors with high capacitance and a broad voltage range. BME capacitors are available in packages that are smaller than those of PME capacitors

EEE Components, PASSIVES

Film Capacitors Characteristics and Uses in Power Applications

Posted by doEEEt Media Group
On November 1, 2020
0

Film capacitors in power electronics find a wealth of applications and excel when high ripple current ratings are required or when the environment imposes over-voltage stress

ABC of CLR, EEE Components, PASSIVES

Film and Foil Organic Dielectric Capacitors PP & PC

Posted by Tomáš Zedníček
On October 26, 2020
0

Introduction Polypropylene (PP) is from a molecular point of view a non-polar dielectric with small losses and a relatively straight and moderate TC. Since the smallest film thickness is approx. 3.5 μm (0.14 mils) and εr ≈ 2.3 the capacitor can not come down to those sizes characterizing

EEE Components, PASSIVES

Film/Foil Organic Dielectric Capacitors PS,PPS,PTFE,PSU

Posted by Tomáš Zedníček
On October 26, 2020
0

Polystyrene (PS) represents a non-polar dielectric material that just as polycarbonate to a great extent has been replaced by polypropylene. The availability is strongly limited due to ceased production. Polyphenylene Sulfide or simply PPS has come to stay mainly because of its relatively high-temperature resistance which has allowed SMD manufacture.

EEE Components, PASSIVES

Class 1 Ceramic Dielectrics

Posted by doEEEt Media Group
On July 28, 2020
0

The performance of ceramic capacitors are greatly determined by the properties of the dielectric material. Class I dielectrics are ultra-stable and usually made of non-ferroelectric materials

EEE Components, PASSIVES

Capacitor Technology: 2019-2025 What’s Next

Posted by doEEEt Media Group
On April 17, 2020
0

In the technical-economics of capacitance, the greatest ROI in research dollars comes from the manipulation of the available surface area of the traditional dielectric materials: Ceramic, Plastic, Aluminum, and Tantalum.

ABC of CLR, EEE Components, PASSIVES

Film and Foil Organic Capacitors PET and PEN

Posted by Tomáš Zedníček
On February 27, 2020
0

The polyester film is most reliable and together with PP most used of plastic films. It can be produced in thicknesses down to 0.7 μm (0.03 mils). Its tensional stability is high and it’s εr ≈ 3.2. This has facilitated the manufacture of one for organic dielectrics very space-saving capacitor. A typical field of application is decoupling. Certain applications like switched mode power supplies (SMPS) require for filtering and decoupling purposes large capacitance and moderate losses which have made the MKT capacitor an attractive replacement for the relatively expensive ceramic X7R capacitors.

Plastic Packaging for Space

Types of plastic film capacitor dielectrics

Posted by doEEEt Media Group
On August 8, 2019
0

Film capacitors have characteristics that make them suitable for a broad spectrum of applications including filtering, decoupling, bypassing, EMI suppression, pulse coupling, blocking, and smoothing.

ABC of CLR, EEE Components, PASSIVES

Comparison Charts of Film & Foil Organic Capacitors

Posted by Tomáš Zedníček
On April 30, 2019
0

Some comparison graphs between different dielectric types of organic capacitors are depicted in this post