Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: re: class AB

205.162.100.130

Posted by Steve Eddy on February 8, 2001 at 02:19:39

In Reply to: re: class AB posted by Mart on February 7, 2001 at 23:46:48:

Mart wrote:

I was talking to an Electronic Technician. He said the rectifier impedence reduces in order to draw more current from the wall. I assume he's talking Class AB. Is this true, or is he full of it?

I think what he's really trying to say is that your rectifier diodes will not be conducting at all times since you're still dealing with a pulsed DC waveform out of the rectifier bridges. So much as with a more conventional power supply, the rectifier diodes will only be conducting when the voltage across your reservoir caps is less than the voltage across the rectifier diodes which means that your inductor/capacitor arrangement will alternately see a high impedance when the diodes are off and no current is flowing through them and a low impedance when they turn on and are topping off your reservoir caps.

Whether the amplifier itself is operating in class A or class AB, it will still be drawing down on the reservoir capacitors between cycles just as happens with a conventional supply, only it will want to be topping them off 240 times per second as opposed to 120 times per second.

Why not just go with a choke regulated supply? I don't see why it wouldn't give you the same or better end result you're trying to achieve with this design.

se

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