EES and EEK Series of High Power Inductor and High Current Power Inductor are designed using Helical Winding (Helix Coil) in semi quasi planar structure to achieve
lower DC resistance (DCR), lower AC resistance (skin effect loss), and high inductance. The core materials used are Distributed Air Gaps Compacted Cores from Magnetics, CSC and Micrometal. Both Gapped and UnGapped cores are used to extend the DC bias capability.
The ELCES and ELCEK Series are Very High Power Inductor and Very High Current Power Inductor that are potted with epoxy in an aluminium enclosure with mounting feet.
These 400 amps inductors are ideally suited in applications with cold plates for heat sinking. The core materials used are Distributed Air Gaps Compacted Cores from Magnetics (KoolMu, XFlux), CSC (Sendust, Megaflux) and Micrometal (Arnold Sendust, Fluxscan).
Both Gapped and UnGapped cores are used to extend the DC bias capability.
In addition, quasi-distributed air-gap ferrite cores are also available as custom designs. Please contact CWS at sales@coilws.com.
These inductors are built by slicing the legs of the ferrite E-cores into multiple sections and then bonded together with air gaps.
These very low core loss ferrite based inductors with multi-air gap structures are popular for electric vehicle chargers application
LT SPICE model can be downloaded from the link LT Spice for E Series, LT SPICE for E Series,.
Thermal model can be downloaded from the link provided in the table below for each part # .
Power Loss Calculator can be used from the link provided in the table below for each part # .
Power Loss Calculator Help/Guide/Example file can be downloaded here, Power Loss Calc Help/Guide/Example file.
These are potted inductors. For unpotted versions, please see our ES, EK, and E73040-Series.
The table below shows the types of cores used in each of the part numbers. The EES Series are using Sendust or KoolMu core type and is suitable for swinging chokes, energy storage filter inductor in SMPS with high ripple current, in-line noise filters with large AC voltage swing, unidirectional drive application such as pulse transformer and flyback transformer. Sendust or KoolMu has good frequency response up to 1 Mhz, lower core losses, and will operate at a lower temperature.
The EEK Series are for those applications requiring small inductance drop when a high DC current (DC bias) is flowing into the inductor. The EEK series are built using Mega Flux cores with higher saturation flux density. The EEK Mega Flux version is suitable for Output Ripple filtering, High Power Output Chokes and High Current Inductor where good DC bias characteristics are desired. The core loss of the Sendust/Koolmu and Mega Flux are very similar at a frequency below 300 Khz. Mega Flux version cost a little more than the others. Mega Flux cores are not suitable for application over 750 Khz, and has a much higher core loss than the Koolmu/Sendust cores.
The part PDF drawing has the DC Bias Current versus Inductance table. It is not necessary that Inductors with higher Inductance versus DC Bias Current is better in all cases. This is because Energy Storage in a filter is defined as 1/2 x [L] x [Sq I], where [L] is the inductance and [Sq I] is the square of the current flowing into the Inductor. For energy storage filtering applications, having a good DC bias is not always a desired feature. When the current flow into the inductor increases, the amount of energy stored increased to the square of the current [Sq I], and if the inductance [L] does not drop when the current increase, the energy stored maybe too high and could potentially cause a circuit to blow up. For such energy storage filtering application such as Input Filter ( Phi or butterworth or chebyshev filters), or the Boost Inductor, the EES Series using Koolmu or Sendust is usually the desired choice. However, every application is different and the design engineer must balance the trade-offs.
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