magnetics in the digital world
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1 magnetics in the digital world - the untold or forgotten facts Alexander Gerfer CEO Würth Elektronik eisos GmbH & Co. KG AG/sku Nov
2 Würth Elektronik eisos who we are AG/sku Nov
3 Würth Elektronik eisos Europe s third largest manufacturer of electronic and electromechanical components AG/sku Nov
4 electronic components AG/sku Nov
5 electromechanical components AG/sku Nov
6 globally available - locally present AG/sku Nov
7 global quality AG/sku Nov
8 fast and cost-free design-in support AG/sku Nov
9 we tailor the quantities to your needs AG/sku Nov
10 catalogue products available ex stock AG/sku Nov
11 maximum service in minimum time AG/sku Nov
12 magnetics in the digital world AG/sku Nov
13 AG/sku Nov
14 AG/sku Nov
15 magnetics in the digital world confusion all around AG/sku Nov
16 magnetics in the digital world confusion all around missing education alternative facts inaccuracy design tips AG/sku Nov
17 magnetics in the digital world confusion all around missing education alternative facts inaccuracy design tips AG/sku Nov
18 missing education Seemingly, few people understand how magnetic cores really work, let alone how to design circuits that use them effectively. The misconceptions and misunderstandings about magnetics are immense both in universities and in industry One reason magnetics don t lend themselves to straight forward analysis is that there are no standards for expressing the properties of magnetic materials. Leland Teschler Executive Editor Machine Design AG/sku Nov
19 What is this? AG/sku Nov
20 What is this? AG/sku Nov
21 magnetics in the digital world confusion all around missing education alternative facts inaccuracy design tips AG/sku Nov
22 alternative facts and suddenly all basic principles expire? AG/sku Nov
23 perception and reality AG/sku Nov
24 shielded or unshielded E-field shield AG/sku Nov
25 millions of power supplies per year all wrong? AG/sku Nov
26 magnetics in the digital world confusion all around missing education alternative facts inaccuracy design tips AG/sku Nov
27 Do you remember? AG/sku Nov
28 specification of the inductor s current and their losses AG/sku Nov
29 REDEXPERT AG/sku Nov
30 magnetics in the digital world confusion all around missing education alternative facts inaccuracy design tips AG/sku Nov
31 7 design tips for the selection of power inductors AG/sku Nov
32 basics of magnetism and materials Select the core material of your storage inductor to match the switching frequency of the DC/DC converter. Select the core material for filter applications according to the interference frequency range. AG/sku Nov
33 electrical property definitions for inductors There is no standard for the definition of the saturation current of power inductors! Do not allow currents to reach the roll-off region of saturation for ferrite-based storage inductors. AG/sku Nov
34 electrical property definitions for inductors -2 There is no standard for rated current definition of power inductors. There is no test standard for measuring the temperature increase at rated current! The operation of inductors at rated current increases the temperature of the component (this is not a fault!). If the temperature rise is too high, use a component with a lower DCR value, which usually requires bigger components... or passive and active cooling. AG/sku Nov
35 inductance value The ripple current selection is important for determining the inductance value. The higher the ripple current - the smaller the required inductance value L.It may increase the AC losses while simultaneously reducing the DC losses (check - e. g. REDEXPERT). AG/sku Nov
36 power inductor current losses Inductor losses are always a combination of AC core and winding loss as well as DC losses. Standard simulation models are not able to provide accurate loss results. Traditional test setups and formulas apply only to small signal and sine waveforms. REDEXPERT is a tool whose data was taken from measurements on real DC/DC curves and then transferred to simulation data. AG/sku Nov
37 EMC and layout recommendations minimize EMI coupling by: Place the "start of winding" to the switching node (self-shielding effect). Use shielded inductors and take care not to place any traces underneath the inductor. Do not forget that epoxy-shielded inductors lose their shielding capability with increasing DC current due to saturation. Take a special look at the switching node in the layout - here on a "T-antenna" there is a high natural noise level, which can easily radiate (e. g. 24 VDC ~ 147 dbµv!). AG/sku Nov
38 myth about EMC ferrites EMC filters don t work Correctly dimensioned EMC ferrite filtershave a dampening effect, if taken into account the parasitic effects of your circuit and identifying over-coupling paths in case of malfunctions. Component selection can be carried out by calculation but also by simulation in REDEXPERT or LTspice. AG/sku Nov
39 magnetics in the digital world AG/sku Nov
40 magnetics in the digital world still play a key role Talk to your manufacturer! AG/sku Nov
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