I am designing boost converter. I need to select inductor for the same. As a new bee i don't know the criteria for selecting the same.
(1)what is the maximum current density of copper bare wire for inductor used in boost converter?
(2)what is industry standard for the same?
Current density value for inductor used in boost converter
boostdc/dc converter
Related Solutions
Neglecting the losses of any kind thus assuming a 100% efficiency, one can thing about a boost convert as a voltage translator with constant power. I mean that Pin = Pout.
$$ P_{in} = V_{in}I_{in}$$ $$ P_{out} = V_{out}I_{out}$$
thus
$$ V_{in}I_{in} = V_{out}I_{out} $$
of rewritten differently:
$$ \frac{V_{in}}{V_{out}} = \frac{I_{out}}{I_{in}} $$
thus if you boost 3.3V to 30V and see a power consumption of 9A, then
$$ \frac{3.3V}{30V} = \frac{I_{out}}{9A} $$
$$ I_{out} = 1A $$
If you designed your boost convert to supply roughly 1A then it is working fine. Because we assumed a 100% efficiency, the real available output current would be less than 1A.
Usually you do the computation backward, you know your output current requirement and you can compute what would be the input current.
TLRD: your calculations are fine. I got myself confused by checking them against a different calculator that targeted DCM not CCM. I'm not gonna change the stuff below because Arsenal replied to it, and it might also be useful to you to compare the two modes.
Your inductor looks an order of magnitude too big vs what I get at https://learn.adafruit.com/diy-boost-calc/the-calculator
And it does look like your inductor is far too big:
@Arsenal N.B.: I figured out the difference between these two calculators. The adafruit one gives you a DCM (discountinous current mode) solution, whereas TI's gives a CCM solution.
Which one is preferable depends on various factors. Basically at high output currents you want CCM to lower the losses and stresses on the components, but DCM has better transient response. A lot more about that can be read here, including a side-by-side power efficiency calculation example.
Best Answer
There is no industry standard as far as I know. You should not need to be too concerned by the current density in the copper. What is important to you as a designer is the DC resistance of the inductor as this will give losses resulting in heat dissipation in your inductor, a too high series resistance and it will get hot !
Another VERY IMPORTANT, perhaps even MORE IMPORTANT property of the inductor is the saturation current. What current can it handle ? If the current rises above this value, the magnetic core of the inductor will saturate and the inductor will start to behave like a (low-value) resistor. The inductor will not be able to store more magnetic energy.
Usually and fortunately if you select an inductor with a sufficiently high saturation current, the copper windings will be able to handle that current :-)
Have you read this: http://powerelectronics.com/content/guide-selecting-inductors-switching-regulators?page=1 ??