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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th March 2010, 12:50 PM   #1
JIMMEE is offline JIMMEE  Thailand
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Default class D diy or? 400Vpeak-peak

This PCB and Link
CLASS DD

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Old 25th March 2010, 02:53 PM   #2
81bas is offline 81bas  Germany
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It is a module from LabGruppen power amp... Used to create floating power voltage rails for slave class AB amp module (class TD)

Well, maybe I am wrong But heatsink copper fins are looking the same as by LabGruppen

Last edited by 81bas; 25th March 2010 at 02:59 PM.
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Old 27th March 2010, 01:31 AM   #3
JIMMEE is offline JIMMEE  Thailand
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Quote:
Originally Posted by 81bas View Post
It is a module from LabGruppen power amp... Used to create floating power voltage rails for slave class AB amp module (class TD)

Well, maybe I am wrong But heatsink copper fins are looking the same as by LabGruppen
It is not module from LabGruppen (Class TD). It is module Class D from Thailand.But use heatsink copper fins.
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Old 27th March 2010, 10:41 AM   #4
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It looks clever but doesn't look like 6kW module, especially for reservoir capacitance and the inductor. Do you know what's the core material?
Also the layout design doesn't seem to be capable of performing clean fast switching despite heavy buffered gate drive.

However I probably don't understand all the details about the design:
- first, it is two mosfet-diode buck converters connected in parallel (BCA topology), yes?
- what is the network with two diodes and resonant tank? Any sort of soft-switching ZVT cell?
-the schematics are not readable enough for me to determine modulator/feedback topology, I guess it is some sort of clocked but am not sure about that, do you have readable versions?

Regards,
Adam
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Old 30th March 2010, 05:43 AM   #5
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Its a copy of crown bca itech series amplifier, nothing else..........but in highly poor pcb layout.
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Old 30th March 2010, 08:08 AM   #6
JIMMEE is offline JIMMEE  Thailand
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Quote:
Originally Posted by Workhorse View Post
Its a copy of crown bca itech series amplifier, nothing else..........but in highly poor pcb layout.
Why? output Coil dissimilar. But Crown use same coil + and -.

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and this BCA PWM output
Click the image to open in full size.

Last edited by JIMMEE; 30th March 2010 at 08:25 AM.
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Old 30th March 2010, 09:03 AM   #7
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Quote:
Originally Posted by JIMMEE View Post
Why? output Coil dissimilar. But Crown use same coil + and -.

Click the image to open in full size.
and this BCA PWM output
Click the image to open in full size.
Ask the copymaster
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Old 31st March 2010, 07:11 AM   #8
aandy is offline aandy  United Kingdom
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core material looks like -2 from micro metals.

jimmee looks neat,most likely to be better than a crown.

the last crown i bench tested was No were near to its published ratings
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