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Class D Switching Power Amplifiers and Power D/A conversion

150uh - 62khz-500khz Ferrite Which Core?
150uh - 62khz-500khz Ferrite Which Core?
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Old 22nd March 2019, 06:40 PM   #11
MorbidFractal is offline MorbidFractal
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Quote:
Originally Posted by birgitay View Post
10 spir will also burn in 2 / amps. If I did what I did, I didn't hold 150. What could be the ideal core?
You have to calculate a core area product. Winding Area x Core Area. Aw.Ae

What is the load of your amplifier?
What is the power of your amplifier?
What is the switching frequency of your amplifier?
What is the supply voltage of your amplifier?


Why have you chosen a 150uH inductor?
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Old 22nd March 2019, 06:43 PM   #12
birgitay is offline birgitay
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Amplifer power supply 2x85vdc.
Min freq ; 62khz - max freq ; 400khz
Mosfet transistor 2x irfp250
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File Type: pdf Protel-Schematic1.pdf (35.2 KB, 19 views)
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Old 22nd March 2019, 06:58 PM   #13
MorbidFractal is offline MorbidFractal
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Quote:
Originally Posted by birgitay View Post
Amplifer power supply 2x85vdc.
Min freq ; 62khz - max freq ; 400khz
Mosfet transistor 2x irfp250

Oh.... One of those.


You missed out the load and the power.
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Old 22nd March 2019, 07:04 PM   #14
birgitay is offline birgitay
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schema here. Power is not clear
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Old 22nd March 2019, 07:11 PM   #15
MorbidFractal is offline MorbidFractal
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Quote:
Originally Posted by birgitay View Post
schema here. Power is not clear

What power do you want and into what load?
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Old 22nd March 2019, 07:25 PM   #16
birgitay is offline birgitay
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The current power is good. I'm not quite sure but it could be 900w. 4 ohms.
Which core is required for this circuit?
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Old 23rd March 2019, 03:50 AM   #17
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Your core might well be suitable but you need to have a much bigger gap. Try five layers of paper tape.
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Old 23rd March 2019, 07:53 AM   #18
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I tested the Rm14 core with five paper money. I left it after the transistor IR2110 failure. Not working, lit
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Old 23rd March 2019, 11:56 AM   #19
MorbidFractal is offline MorbidFractal
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Quote:
Originally Posted by birgitay View Post
The current power is good. I'm not quite sure but it could be 900w. 4 ohms.
Which core is required for this circuit?

OK. Ignore the rest. 900W 4R 15A RMS 21A PEAK


AwAe = LIrmsIpk/BpkJKcu
AwAe = (150u x 15 x 21)/(300mT x 4E6 x 0.7)
AwAe = 5.625E-8


Assume Aw = Ae


Aw = Ae = 2.37E-4 = 237mm^2


ETD49



Ae = 211mm^2
Aw = 269mm^2


Aw.Ae = 5.676E-8


Nmin = LIpk/BAe
Nmin = (150E-6 x 21)/(300mT x 211E-6)
Nmin = 50


More later.
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File Type: pdf etd_49_25_16.pdf (390.6 KB, 12 views)
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Old 23rd March 2019, 01:19 PM   #20
MorbidFractal is offline MorbidFractal
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Oh... The above assumes that you want 900W continuous rated power. If you assume music is 1/8 continuous then you can use a higher number for J, current density in the wire, and end up with a smaller inductor. You still have to design to avoid saturating the inductor based on the peak current though.


Once again why 150uH
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