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Class D Switching Power Amplifiers and Power D/A conversion

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Old 12th May 2005, 10:09 AM   #11
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Quote:
Originally posted by frozenpod1
Does anyone know what the UCD400 uses for control is it an IC or descrete components
The comparator and the mosfet drivers are entirely discrete. In addition, the control and modulation circuit are completely passive (the amplifier is self-oscillating). There is an op amp buffer at the input.
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Old 15th May 2005, 07:43 AM   #12
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Quote:
Originally posted by frozenpod1
In power electronic inverters 3 level modulation is almost always used.

The increase in performance at 50Hz is very large when going from 2 to 3 level.

That is why I was going to use 3 but I may have to reconsider

We also use 3 level modulation scheme in our subwoofer amp, in which switching frequency is in phase but audio signal is out of phase, in this configuration the size of output filter could be made small as compared to 2-level. And the damping factor also improves alot . it also minimises the distortion effects and eliminates bus pumping as well.
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Old 16th May 2005, 12:18 AM   #13
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Are you not concerend with the audio signal being out of phase as in the canceling effect with other speakers which are in phase.

Also there is a difference in the way we hear sounds wether the first peak is positive or negative air pressure, there have been test which prove there is a difference that is why it is very important to insure that the amplifier is in phase or out of phase by 360 deg.
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Old 16th May 2005, 12:16 PM   #14
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What i was refering to an is a bridged amp comprises of 2 half bridge Class-D amps in which the switching frequency is in phase , but the audio signal is out of phase.

Hope you understand it.
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Old 17th May 2005, 04:25 PM   #15
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The AD1990 - 1996 look nice enought to me. Unfortunately, they are not even in the samping stage yet.
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