Category | Capacitors

Equivalent Series Resistance (ESR) for Capacitors

Posted on 12 April 2020

              Normally, the resistive losses of capacitors are denoted as the dissipation factor tan δ. In the case of bigger capacitance values, especially of class-II-capacitors, which are predominantly deployed for current supply, the data sheets of producers specify the Equivalent Series Resistance (ESR) in place of tan δ. ESR combines the resistive losses and [...]

Mounting Positions of Aluminum Electrolytic Capacitors with Screw Terminals

Posted on 11 April 2020

              During operation aluminum electrolytic capacitors always conduct a leakage current that causes electrolysis. On one hand, the oxygen produced by electrolysis will regenerate the dielectric layer but, on the other hand, the hydrogen released may cause increased internal pressure of the capacitor. A safety vent in the can disk [...]

Heat Dissipation and Cooling for Aluminum Capacitors

Posted on 09 April 2020

  The useful life values stated in data sheets apply to aluminum electrolytic capacitors with natural cooling, i.e. the heat generated in the winding is dissipated through the casing and by natural convection. It is possible to increase the permissible ripple current and/or prolong the useful life by using additional cooling by heat sinks or [...]

Film Capacitors for DC-Link

Posted on 07 April 2020

              DC-Link or DC intermediate circuits are energy storage devices that connect several electricity grids by inverters on a joint current and voltage level. Requirements for film capacitors for DC-Links are: - High CV (capacitance x voltage) product - Compact - Over-voltage (DC) capability - Low losses (ESR) with high current [...]

Capacitor Bank Design

Posted on 30 March 2020

              In some applications, the required capacitance may not be achieved by using a single aluminum electrolytic capacitor. This may be the case if: the required electrical charge is too high to be stored in a single capacitor, the voltages that are to be applied are higher than can [...]

EMC Filter as an Application for Film Capacitors

Posted on 20 March 2020

              Electromagnetic compatibility (EMC) is a term that indicates the generally desired state that technical devices don't destroy or disturb each other by unwanted electrical or electromagnetic effects. There are currently efforts to harmonize national standards across Europe. Requirements for film capacitors that meet these standards for EMC are: Good AC [...]