[time-nuts] Parallel voltage regulators

[Don Collie]

Great idea!!,....................................Don C.


----- Original Message ----- 
From: "Max Robinson" <max at maxsmusicplace.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, October 27, 2007 10:07 AM
Subject: Re: [time-nuts] Parallel voltage regulators


> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+donmer=woosh.co.nz at febo.com RETRY
>
> I do have some experience with temperature controlled ovens.  I found that 
> a
> long term plot of the temperature while using an unregulated supply on the
> oven heater showed small random variations due to voltage variations. 
> When
> the oven heater was put on a regulated supply the line became flat.  The
> problem here seems to be during the heat up cycle.  The voltage doesn't 
> need
> to be regulated during that time.  You might try sensing the error signal
> and when it is outside of the linear control range you could switch in a
> parallel transistor and resistor to handle the warm-up current and it 
> would
> switch out when the oven has stabilized at the lower current.
>
> Regards.
>
> Max.  K 4 O D S.
>
> Email: max at maxsmusicplace.com
>
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> ----- Original Message ----- 
> From: "Bill Hawkins" <bill at iaxs.net>
> To: "'Discussion of precise time and frequency measurement'"
> <time-nuts at febo.com>
> Sent: Friday, October 26, 2007 1:21 AM
> Subject: Re: [time-nuts] Parallel voltage regulators
>
>
>> There is a concept in temperature control called feed-forward.
>>
>> In this case you would sample the supply line with an inverting
>> amplifier and use it to increase the oven drive signal as the
>> line voltage decreases. The goal is to keep the integral term
>> from changing as the line voltage changes. It is not as easy
>> as it sounds.
>>
>> Bill Hawkins
>>
>>
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