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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 23rd March 2019, 02:49 PM   #21
birgitay is offline birgitay
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Quote:
Originally Posted by MorbidFractal View Post
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

the value of the inductance in this circuit is 150uh. For him.
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Old 24th March 2019, 10:30 AM   #22
MorbidFractal is offline MorbidFractal
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The picture just shows a yellow blob over the component. There is no value. If the filter were to be 40KHz cut off with a 4R load you might expect 16uH with 1uF.
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Old 24th March 2019, 11:29 AM   #23
basreflex is offline basreflex  Spain
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15uH seems a more logical value. could it be 15.0uH?
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Old 24th March 2019, 03:39 PM   #24
birgitay is offline birgitay
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In the diagram, type 150uh value. The circuit made copies and came to me. I've measured the coil at 150uh. Or does it work at another value? I do not know
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Old 24th March 2019, 07:45 PM   #25
MorbidFractal is offline MorbidFractal
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If you just have the circuit diagrams then ???. You suggest you have measured a coil. Was that on a physical example of the amplifier? I assume that is the case because you suggest you have already blown one up... Or is this something you have made yourself based on an incomplete circuit diagram?


The circuit diagram shows a 470nF output filter capacitor which, with a 4R load, would suggest an 80KHz cut off frequency and an 8uH inductor.


However the above applies to fixed frequency operation but it is still the case that 150uH in that position is a huge and likely to be wrong value. Given the circuit is self oscillating 150uH is going to make it go at some silly low frequency in the first place.


I would be inclined to go for a 1uF filter capacitor and a 16uH filter inductor and see if it manages not to die so quickly.
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Old 24th March 2019, 09:54 PM   #26
birgitay is offline birgitay
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but there were gray cores of 150uh. It was working great. Bile at 4 ohm load.
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Old 25th March 2019, 09:06 AM   #27
MorbidFractal is offline MorbidFractal
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Do you still have the originals and can you provide a picture or at least a more complete description... shape of core, number of turns, thickness of wire. It is possible that they used a soft saturating material.
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Old 25th March 2019, 09:20 AM   #28
birgitay is offline birgitay
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Yamaha dsr215
passive tower 4 ohms.
2x85 volt dc.
The performance is terrific. No warming up bile. The core is gray
Youtube video link :


YouTube
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Old 25th March 2019, 01:49 PM   #29
MorbidFractal is offline MorbidFractal
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I assume you are trying to copy the board? If the zero bias value of the inductor is in fact 150uH then as previously suggested it is possible that it is a soft saturating material... a swinging choke. I still doubt that. Have a look at,


Class D Amp with LM566, LM393 and 2XIRF530


It is a similar circuit but L1 is 30uH with C16 470nF which would be values consistent with an 8R load, root(L/C)
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Old 25th March 2019, 01:59 PM   #30
birgitay is offline birgitay
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Look, man.
I've done many lessons so far, d class. However, I have not seen a stable amphiplifter working. I have hundreds of cards. No kernel. Look at that with Ltspice
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