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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th April 2012, 07:39 PM   #1
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Default UMAC Class D?

Does anybody have experience with this technology?
Pascal - High Power Pro Audio OEM Amplifier Modules
Is there eny explanation how the control structure works? Is it patented?
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Old 21st April 2012, 08:22 PM   #2
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aah so many answers!... ;-)
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Old 21st April 2012, 08:45 PM   #3
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One of our members seems to be working in an enhancement task force for this circuit.

why this class D power supply no high voltage side electronic cap?
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Old 21st April 2012, 08:56 PM   #4
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so the PSU for the X-Pro 3 is a single stage flyback PFC with mid-sized coil. And they claim >2KW of output power ? lool.. i guess it ll be more like a few hundreds of watts
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Old 21st April 2012, 09:35 PM   #5
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I would not expect that it has PFC.
The huge caps on the primary indicate the opposite.
There seem to be two switches on the primary.
I would not expect a flyback there (neither with paralleled switches nor an asymetrical half bridge flyback), it is looking more like a typical half bridge converter. Series resonant or LLC.

The smaller transformer might be a flyback for auxiliary supplies, but that's also making me wonder, because auxiliaries could be derived from the main transformer as well.

Just buy one, examine and tell us
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Old 22nd April 2012, 09:27 AM   #6
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Quote:
Originally Posted by ChocoHolic View Post
I would not expect that it has PFC.
The huge caps on the primary indicate the opposite.
There seem to be two switches on the primary.
I would not expect a flyback there (neither with paralleled switches nor an asymetrical half bridge flyback), it is looking more like a typical half bridge converter. Series resonant or LLC.

The smaller transformer might be a flyback for auxiliary supplies, but that's also making me wonder, because auxiliaries could be derived from the main transformer as well.

Just buy one, examine and tell us
Fact is, I am searching for a full bridge class D assembly to run on 175V, so I came across this part. I have good telecom rectifiers, so no need for built-in PSU.
Background of the story is: I d like to put 4 full-bridges together with my rectifiers in one case of ~4U height for a 4 ch amp (2 x RCF Event 4000 tops and 2 x 18G50 woofers). This would give a nice system for my garden home discotheque. At the moment I am more inclined to buy 4 x UCD 2K, but still thinking..... Does anyone know from where within the EU to get the UCD assemblies at a reasonable price?
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Old 22nd April 2012, 10:41 AM   #7
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Quote:
Originally Posted by ViennaTom View Post
... for my garden home discotheque.
Make sure that you always invite your neighbours

Quote:
Originally Posted by ViennaTom View Post
At the moment I am more inclined to buy 4 x UCD 2K, but still thinking..... Does anyone know from where within the EU to get the UCD assemblies at a reasonable price?
...hypex has its price... I am not aware of discount sales channels.
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Old 22nd April 2012, 02:19 PM   #8
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Looking at the cost of 4 x UCD 2K, it ll maybe significantly cheaper to use 1 x UCD2K for the 2 18" in parallel and 2 x UCD700 half bridges for the Tops....hmm... still plenty enough power and headroom for this system, but less versatility for other systems...
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Old 15th December 2012, 11:08 AM   #9
dimitri is offline dimitri  United States
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Quote:
Is there eny explanation how the control structure works? Is it patented?
US pat 7893743
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