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#apertus IRC Channel Logs

2017/03/18

Timezone: UTC


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Bertl_oO
off to bed now ... have a good one everyone!
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Bertl_oO
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15:38
fysal
hi i am abdelrahman fysal, i want to ask about switching regulator, what is meant by control loop?...and switcher? ....and are switching modes(buck,boost ...)?
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intracube_afk
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17:14
Bertl_zZ
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17:14
Bertl
morning folks!
17:14
Bertl
hey fysal!
17:18
Bertl
check out the IRC logs, there has been some discussions regarding the smart switcher
17:19
Bertl
http://irc.apertus.org/index.php?day=13&month=03&year=2017
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Elbehery
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17:43
Elbehery
Hey bertl, where can i find info about the control daemon interface?
17:44
Bertl
probably the best soure right now would be BAndiT1983|away when he's around
17:44
Bertl
(currently working on defining the interface)
17:44
Elbehery
Hmmm alright
17:44
Elbehery
I started a simulink environment simulating a mass being heated and a fan cooling it
17:45
Elbehery
i am not at the point of defining a very simple pid controller and inserting it to the fan controller in the simulink environment
17:45
Bertl
s/not/now/?
17:46
Elbehery
but at the moment i am abit confused about the state controlled fan you mentioned earlier like based on what we will decide to stop the fan of being noise
17:46
Elbehery
sorry i meant now*
17:47
Bertl
maybe it would suffice to have different target temperatures and hysteresis values for each state?
17:47
Bertl
like for example, when the camera is 'idle' or when 'between action' and 'recording'
17:48
RexOrCine
IRC Highlights - https://wiki.apertus.org/index.php/IRC_Highlights
17:48
Elbehery
Aha
17:49
Bertl
because ultimately it doesn't make sense to stop the fan despite heat building up or have it running full speed just because nothing is going on, etc
17:51
Bertl
so for example, when the 'operator' decides that 'between shots' the camera should really cool down as good as possible, then setting the temp limit low should achieve that quite well
17:51
Bertl
during a shot, the defaults would simply allow more heat to build up, keeping the system more quiet
17:52
Bertl
but maybe a limit to the fan PWM would be a good idea there too, like a min/max
17:52
Bertl
e.g. keep a 20% min for the fan, but limit it to 50% (unless the system starts to overheat, of course)
17:54
Bertl
(just doing some brainstorming here :)
17:54
Elbehery
Aha, good point. Min and Max values for pwm are set based on the current state and of course as long as the system temp. is within the allowed range am i getting this correctly ?
17:55
Bertl
yes, I don't think that it makes sense to force a max when the camera will shut down or reboot because of overheating
17:56
Bertl
which brings us to the definition of 'safe' themperatures
17:56
Bertl
there will probably be two sets of limits for those for each sensor
17:57
Bertl
something like a 'desired' range in which 'good' performance can be expected
17:57
Bertl
and an 'absolute maximum' range within operation is guaranteed
17:58
Elbehery
Once t is bigger than the absolute maximum temperature should the target temp be adjusted ? or the system will shutdown ?
18:00
Bertl
I'd say at least we need to produce a warning that the system has left the safe operating range
18:01
Bertl
i.e. some kind of alert signal is required and software should check for the reason and act accordingly
18:02
Bertl
note that the controller inside the FPGA does not need to be aware of the different states, they can (and should) be adjusted from userspace
18:03
Bertl
(just in case this wasn't clear)
18:04
Elbehery
Where exactly the alert signal is sent to? i mean is there something like an LED that indicates safe operating mode ? or this is sent to other software?
18:05
Bertl
definitely other software for now
18:06
Elbehery
aha, so the t732 software should also communicate with this software informing it the safe operating modes are not exceeded based on the reading + do the communication with the plant [fan controller]
18:07
Elbehery
+ use the control daemon interface to gather all the reading
18:07
Bertl
I think that would be the best approach for now
18:07
Bertl
at some point, it could even be integrated into the control deamon
18:08
Elbehery
aha
18:10
Elbehery
thanks so much for your time, i will probably send a very simple prototype for the controller once i am done.
18:10
Bertl
excellent! thanks for working on it!
18:11
Bertl
please try to add information to the lab task where it is missing
18:12
Elbehery
great, here is what i think is missing in the lab description
18:13
Elbehery
1- the control algorithm uses the T757 interface to collect the readings, 2- the control alg. decides which mode of operation the system is at, 3- it will report the current mode of operation to another software, 4- it will adjust the fan speed and limit the target temp/ max - min pwm values based on the current state of operation
18:14
Elbehery
I will probably add these in a comment under the T732 link is it okay ?
18:15
Bertl
yes, that's the idea, extend the lab task with information gathered and ideas you have how to improve it ...
18:16
Elbehery
alright
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slikdigit__
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se6astian|away
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se6astian
off to bed
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se6astian
good night
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se6astian
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intracube
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Bertl
off for a nap ... bbl
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Bertl
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