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Class D Switching Power Amplifiers and Power D/A conversion

Properly sizing transformers for Class D amps
Properly sizing transformers for Class D amps
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Old 8th February 2005, 11:54 AM   #41
destroyer X is offline destroyer X  Brazil
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Default Richie boy, thank you, informations are welcome here.

Thank you.

Carlos
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Old 8th February 2005, 05:25 PM   #42
destroyer X is offline destroyer X  Brazil
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Default I constructed a Peak power meter.

And amplifier measured 100 watts peak each channel...so, this can be something alike 60 watts each channel....a little bit less related the consumption (125 watts).

Now it is clear that really is efficient...produce power without too much heat... and have incredible dinamics.

Very good.

Carlos
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Old 8th February 2005, 06:09 PM   #43
richie00boy is offline richie00boy  United Kingdom
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Properly sizing transformers for Class D amps
You work fast, Carlos. Excellent job To finish off you could construct another power meter to monitor the incoming power and see how close to that 125 watts you really are
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Old 8th February 2005, 07:03 PM   #44
destroyer X is offline destroyer X  Brazil
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Default Not so precise...meter needle weigth...this is not so good

So, in the reality, you can reduce 20 percent the power measured, so, will reach the 80 percent normal efficiency.

Dinamics are wonderfull....distortion is reasonable with volume all the way up.

But have not AC ampere meter....maybe in the future, opening enclosure, i will check voltage and current both rails to calculate the consumption reflected in transformer primary.

Go ahead with supply, thank you and sorry to scape, just a little, the main thread subject.

Please...go to the track again.

regards,

Carlos
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Old 9th February 2005, 11:36 AM   #45
Yves Smolders is offline Yves Smolders  Belgium
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Another power supply design question:

For UcD400's, what cable should I be using from the bridge to the caps/caps to modules? Is 2.5mm enough? multiple strands or massive cable?

3 days, and still waiting for hypex to ship... i'm sooooo curious... maybe i'll start the power supply design this weekend.

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Old 9th February 2005, 11:44 AM   #46
richie00boy is offline richie00boy  United Kingdom
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Properly sizing transformers for Class D amps
2.5mm^2 cable is fine even running a pair of modules off one PSU. It's what I use at those currents. Stranded is my preference as it's easier to work with. As long as you keep things short (less than 14cm) you shouldn't have any problems.
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Old 22nd February 2005, 12:15 PM   #47
richie00boy is offline richie00boy  United Kingdom
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Properly sizing transformers for Class D amps
Just a note to people searching for transformer sizing as per the original thread title, whilst my calculations and methodology throughout this thread are valid, my assumption of the average current drawn by a class-d amp was not. Thanks to a couple of posts by Jaka Racman in the "UcD180 questions" thread, I understand that the average current is less than that which would be for a class-b amp, therefore the transformer does not need to be as large.

A reasonable rule of thumb is that the class-d amp draws 0.68x the current of the class-b amp/load.
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