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ICEPower 200AC with slotted output torroid?
ICEPower 200AC with slotted output torroid?
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Old 23rd August 2019, 11:26 AM   #1
TroelsM is offline TroelsM  Denmark
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Default ICEPower 200AC with slotted output torroid?

Hi all.

Just saw a picture of an ICEPower 200AC module.

I'm guessing that the slotted white/grey torroid is the output inductor.

I've never seen a commercial product with a slotted core before, and my impression is that it is best avoided because the slot will have a huge radiation that will couple to all other parts and wires.

What am I missing? B&O would not do this without proper evaluation and I'm guessing that the slotted core is the cheapest option for them.

Any guesses on the core-type?

Kind regards TroelsM
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Old 23rd August 2019, 06:11 PM   #2
voltwide is offline voltwide  Ireland
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With the slot on top there is little magnetic coupling to the pcb traces. A slotted core is a hint that ferrite material has been used - which lets expect better linearity than iron powder. And btw, real good iron powder cores are expensive.
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Old 23rd August 2019, 06:21 PM   #3
TroelsM is offline TroelsM  Denmark
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Yes, the slot is pointing away from the pcb, but that also removes Any chance of controlling or containing the field?

Kind regards TroelsM
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Old 23rd August 2019, 07:05 PM   #4
Reactance is offline Reactance  South Africa
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Quote:
Originally Posted by TroelsM View Post
Hi all.

Just saw a picture of an ICEPower 200AC module.

I'm guessing that the slotted white/grey torroid is the output inductor.

I've never seen a commercial product with a slotted core before, and my impression is that it is best avoided because the slot will have a huge radiation that will couple to all other parts and wires.

What am I missing? B&O would not do this without proper evaluation and I'm guessing that the slotted core is the cheapest option for them.

Any guesses on the core-type?

Kind regards TroelsM
wow transistors with no heat-sink, cheap tactics again.
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Old 23rd August 2019, 07:08 PM   #5
jean-paul is offline jean-paul  Netherlands
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It is class D and it has PCB copper for cooling.
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Old 23rd August 2019, 07:22 PM   #6
TroelsM is offline TroelsM  Denmark
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External heatsinks or not, - B&O has a reputation for solid Engineering. I'm sure there is good reasons for the chosen heatsinking and the clotted coil. - I'm just curious as the slotted solution is very unusual.

TroelsM
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Old 23rd August 2019, 07:39 PM   #7
Mark Tillotson is offline Mark Tillotson
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Mag field drops off as the inverse cube of distance, so it will rapidly fade to insignificant with enough distance.


Interestingly most of the energy storage in such an inductor is inside the gap.
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Old 23rd August 2019, 07:58 PM   #8
TroelsM is offline TroelsM  Denmark
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But what is "enough distance"? I'm guessing that these modules are build to be implemented in for example in active speakers where in/out-put wires could be placed close to the coil.

Kind regards TroelsM
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Old 23rd August 2019, 11:05 PM   #9
Reactance is offline Reactance  South Africa
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Originally Posted by TroelsM View Post
External heatsinks or not, - B&O has a reputation for solid Engineering. I'm sure there is good reasons for the chosen heatsinking and the clotted coil. - I'm just curious as the slotted solution is very unusual.

TroelsM
who said B&O even makes the amplifier.
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Old 24th August 2019, 05:04 AM   #10
zorz is offline zorz  United States
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I’ve been running this in dual mono with a 200ASC and have been really impressed. So far I’ve not found the sound to be lacking in the least, though I can’t speak to the finer points of the pcb design/components.
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