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Re: LF: CLASS D and E

from [John Pumford-Green GM4SLV] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: CLASS D and E
From: John Pumford-Green GM4SLV <[email protected]>
Date: Sun, 4 Nov 2007 12:57:53 +0000
In-reply-to: <000701c81ede$3af050e0$1ae4fc3e@g3kev>
Organization: The Gammy Bird
References: <000701c81ede$3af050e0$1ae4fc3e@g3kev>
Reply-to: [email protected]
Sender: [email protected] 
On Sun, 4 Nov 2007 12:28:05 -0000
"hamilton mal" <[email protected]> wrote:

> Hi all
> Class D and E amplifiers are supposed to give around 80/90 %
> efficiency. Has anyone actually achieved these figures. It seems
> anything above 60% is hard to arrive at using normal coils/capacitors.
> 
> 73 de  Mal/G3KEV
> 
> 

Hello Mal & LF,

The best I've acheived with Class-E has been about 70-75%. I understand
that you're supposed to select values of components and tune the o/p
stage for best efficiency at your chosen DC supply volts and target
power. Away from these points the efficiency won't be optimum. 

70% is easily acheived by careful tuning. 80% and better has eluded me
so far.

Cheers,

John

-- 
John GM4SLV
IP90gg
Clousta, Shetland
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