Category | Capacitors

Safety Characteristics of Film Capacitors

Posted on 01 July 2013

                    Self-healing The most important reliability feature of film capacitors is their self-healing capability, i.e. their ability to clear faults (such as pores or impurities in the film) under the influence of a voltage. The metal coatings, vacuum-deposited directly onto the plastic film, are only 20 [...]

Classification of Film Capacitors

Posted on 20 February 2013

              Film capacitors, also referred to as FK capacitors, are fixed capacitors with plastic film dielectrics. Film capacitors are grouped and designated according to the dielectric used since the dielectric in use has a great effect in determining film capacitor characteristics. Film capacitors are classified further in terms of [...]

Preferred Fuse Placement

Capacitor Protection with Semiconductor Fuses

Posted on 24 October 2012

  The primary responsibility of a capacitor fuse is to isolate a shorted capacitor before the capacitor can damage surrounding equipment or personnel. Typical capacitor failure occurs when the dielectric in the capacitor is no longer able to withstand the applied voltage. A low impedance current path results. The excessive heat generated builds pressure and [...]

Temperature Influence on Series Capacitance

Posted on 22 June 2012

  The capacitance of an electrolytic capacitor is not a constant quantity that retains its value under all operating conditions. Temperature has a considerable effect on capacitance. With decreasing temperature, the viscosity of the electrolyte increases, thus reducing its conductivity. Figure 1: Heat transport in a aluminum electrolytic capacitor             [...]

Power Capacitors - Technology and Basics

Posted on 18 June 2012

              Power capacitors are used in power systems engineering, power electronics, and in high voltage engineering. Such capacitors belong to the family of metallized paper and polypropylene film capacitors. Power capacitors also include ceramic power capacitors, vacuum capacitors, and standard SF6 gas insulated capacitors, which are used mainly in the high frequency technology sector. [...]

Film Capacitors

Posted on 13 June 2012

              Capacitors for industrial use are found in nearly all electronic applications. They are used in fans, pumps, conveyors, elevators, fork lifts, windmills, solar converters, UPS, welding, X-ray and so on. The reason for this is the variety of technical functions of film capacitors such as filtering, EMI suppression, [...]

Introduction to Capacitors

Posted on 04 June 2012

              A capacitor is a passive electrical component used to store energy. Capacitors are the second most common electronic components, after resistors, used in discrete circuitries and deployed in electronic devices. A nonconductive region, the dielectric, separates the two conductors of the capacitor. An ideal capacitor is wholly characterized by a constant capacitance [...]

Aluminum Electrolytic Capacitors - Overview and Key Applications

Posted on 27 April 2012

Aluminum electrolytic capacitors assume a special position among the various types of capacitors since their principle of operation relies, in part, on electrochemical processes. The advantages of aluminum electrolytic capacitors that have led to their wide application range are their high volumetric efficiency (i.e. capacitance per unit volume), which enables the production of capacitors with [...]

Calculating the Useful Life of Capacitors

Posted on 23 April 2012

  Useful life (also termed service life or operational life) is defined as the life achieved by the capacitor without exceeding a specified failure rate. Total failure or failure due parametric variation is considered to constitute the end of the useful life. Depending on the circuit design, device failure due to parametric variation does not [...]

Design of Aluminum Electrolytic Capacitors and General Features

Posted on 16 April 2012

As it is the case with all capacitors, an aluminum electrolytic capacitor comprises two electrically conductive material layers that are separated by a dielectric layer. One electrode (the anode) is an aluminum foil with an enlarged surface area. The oxide layer (Al2O3) that is formed on this is used as the dielectric. In contrast to [...]