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Electronics Buyers' Guide

Electronics Manufacturing & Production Handbook 2019


 

New DC link capacitors
20 February 2008, Passive Components

Wima's DC-Link MKP 4 capacitors are available with capacitances of 5 μF up to 75 μF and voltages of 450, 700, 900 and 1100 V d.c. They are constructed with a winding element of metallised polypropylene film boxed in a plastic case with self-extinguishing epoxy resin sealing.

These new capacitors are designed for use in DC Link applications in power electronics and are outstanding due to their high rated voltage per component, low dissipation factor (ESR) and very high insulation resistance. Due to their construction they are entirely self-healing in cases of breakdown and exhibit a high life-expectancy. The unpolarised contact configurations, in 4-lead version or with screw-on terminal lugs, guarantee safe contacts even at high current loads.

DC Link capacitors with plastic film dielectric are steadily replacing traditionally used electrolytic capacitors due to more severe electrical requirements in the DC intermediate circuit, such as increased voltages or increased AC converter switching frequencies. As an example, for physical reasons electrolytic capacitors can only be rated up to approximately 500 V d.c. Moreover, due to the high ESR of electrolytics, the AC current load at high frequencies leads to considerable dissipation/self-heating and thus severely limits the permissible current carrying capability.


Credit(s)
Supplied By: Avnet South Africa
Tel: +27 11 319 8600
Fax: +27 11 319 8650
Email: sales@avnet.co.za
www: www.avnet.co.za
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Further reading:

  • Big is beautiful: The benefits of large capacitors
    28 August 2019, Passive Components
    The capacitor is a prime example of a component where small is not always beautiful, as meeting electrical characteristics and safety demands means that a component small enough to solder directly onto ...
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    Vishay has expanded its offering of Qi-compliant wireless charging transmitter and receiver coils with the introduction of 14 new products in industry-standard shield sizes. Consisting of eight single-coil ...
  • Rugged PFC capacitors
    28 August 2019, Electrocomp, Passive Components
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  • LAN transformers for industrial Ethernet interfaces
    28 August 2019, Würth Elektronik eiSos, Passive Components
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  • LED flicker, and how to prevent it
    28 August 2019, Avnet South Africa, Opto-Electronics
    With the growing popularity of LED lighting, especially now that very cheap LED luminaires are coming to the market, flicker is becoming more of a problem. Flicker, a repetitive switching on and off ...
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  • Power inductors for LED headlights
    28 August 2019, Electrocomp, Passive Components
    TDK has expanded its lineup of metal core power inductors with the new SPM-VT series that is designed especially for the high thermal and current demands of automotive LED headlights. These wire-wound ...
  • Ferrite magnetic design tool
    26 June 2019, Electrocomp, Passive Components
    The MDT software from TDK allows application-related parameters to be calculated for all available Epcos ferrite cores and/or materials. It provides access to digitalised material data including their ...
  • Buck converter with low quiescent current
    31 July 2019, Avnet South Africa, Power Electronics / Power Management
    Texas Instruments introduced an ultra-low-power switching regulator with what it claims is the industry’s lowest operating quiescent current (IQ) at 60 nA. The TPS62840 synchronous step-down converter ...
  • MCUs with industrial communication interfaces
    31 July 2019, Avnet South Africa, DSP, Micros & Memory
    Texas Instruments introduced new communications capabilities on its C2000 microcontrollers (MCUs). C2000 F2838x devices enable designers to use a single chip to implement connectivity, including EtherCAT, ...
  • Shielded power inductors
    31 July 2019, RF Design, Passive Components
    High-temperature power inductors from Coilcraft are available with inductance values from 22 to 47 µH, current ratings up to 5,5 A, and low direct current resistance (DCR). The inductors in the XAL7050 ...
  • A quick guide to multi-standard mesh networking
    31 July 2019, Avnet South Africa, Telecoms, Datacoms, Wireless, IoT
    Recent advances in wireless technology have enabled the use of mesh network topologies in home and building control applications. Low-cost IoT technology is driving the launch of devices such as smart ...

 
 
         
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