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nuckolls.bob(at)aeroelect
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 Posted: Fri Oct 04, 2013 6:37 am Post subject: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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At 09:34 AM 10/4/2013, you wrote:
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Eric sent me his prototype DeSlumpifier for testing on my
RV-12. Prior to intalling it, I cranked the engine a few times with
the ignition switches shut off. With no internal backup battery,
the D-180 re-booted each time the engine was cranked. Next I
installed the DeSlumpifier in series with pin 1 of the Dynon D-180
(Master Power). During engine cranking, the D-180 did not
re-boot. It continued to operate normally. I repeated the test
several times, cranking the engine for two seconds, waiting for 10
seconds, then repeating. In each case, the D-180 continued to
operate without re-booting. Next on the agenda is actual starting
of the engine and flight testing.
Joe
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Joe Gores
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Good data sir. Thanks!
Did you sent me the DC/DC
converter you tried the first
time?
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
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| Posted: Mon Oct 07, 2013 5:16 pm Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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Bob,
I mailed the DC to DC converter today. You should have it in a few days. It works for intermittent duty but can not handle 1.5 amps continuously. And so it could be used for short term brownout protection, but not as part of the normal power supply circuit.
Joe
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Joe Gores |
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user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
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| Posted: Mon Oct 07, 2013 5:17 pm Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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Bob,
I mailed the DC to DC converter today. You should have it in a few days. It works for intermittent duty but can not handle 1.5 amps continuously. And so it could be used for short term brownout protection, but not as part of the normal power supply circuit.
Joe
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Tue Oct 08, 2013 5:04 am Post subject: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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At 08:16 PM 10/7/2013, you wrote:
| Quote: |
Bob,
I mailed the DC to DC converter today. You should have it in a few
days. It works for intermittent duty but can not handle 1.5 amps
continuously. And so it could be used for short term brownout
protection, but not as part of the normal power supply circuit.
Joe
--------
Joe Gores
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Can't be used as brown-out protection either (for
the application you had in mind.) That 1.5A may
be a valid continuous rating, but unlike other
current sources that will grunt short term overloads,
switchmode power supplies are not among them. The
thing may go into a self-protective shutdown at
some level not far above 1.5A.
The device suited to this task will have to be
rated for continuous support of the proposed load
irrespective of how long we plan to load it.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Wed Oct 09, 2013 4:56 pm Post subject: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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At 06:42 PM 10/9/2013, you wrote:
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I went flying yesterday. Before starting the engine, I turned on
all electrical loads. After the Dynon D-180 booted up, I checked
the fuel pressure from the electric fuel pump. Total full-load
master-switch on time was not more than a minute or two. During
engine start, the Dynon D-180 rebooted. I gave airplane rides that
required 4 more engine starts that day. The DeSlumpifier prevented
Dynon reboots on those 4 starts. It seems that the battery must be
fully charged for the DeSlumpifier to work. I conclude that the
DeSlumpifier works most of the time, but not always, depending on
battery charge.
Joe
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If you put your voltmeter on a battery that
the true 'open circuit' voltage of a battery
cannon be read until it has sat unloaded for
hours. For a good battery at 100% charge, this
will be on the order of 12.8 to 13.0 volts.
Open circuit voltage within minutes of having
been connected to a 14.6v bus will be higher.
It's the higher resting voltage that puts
just enough 'snort' on the capacitor to
stand off a re-boot event.
Here's a thought. A 'tiny' DC/DC up-converter
like the one you sent me could be used to charge
the capacitors to the higher value. From
a practical perspective, you've got all the time
in the world to charge the capacitor in anticipation
of supporting a brownout transient.
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
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| Posted: Wed Oct 09, 2013 6:48 pm Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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| Quote: | Here's a thought. A 'tiny' DC/DC up-converter
like the one you sent me could be used to charge
the capacitors to the higher value. |
The P6KE18CA voltage transient suppressor in the DeSlumpifier has an operating voltage of about 15 volts. The super capacitors are rated at 5 volts each, total of 20 volts for 4 in series. So the DeSlumpifier could be powered by up to 15 volts without a problem.
There is also the FMEA consideration, more parts to fail.
Joe
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Wed Oct 09, 2013 7:01 pm Post subject: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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At 09:48 PM 10/9/2013, you wrote:
| Quote: |
> Here's a thought. A 'tiny' DC/DC up-converter
> like the one you sent me could be used to charge
> the capacitors to the higher value.
The P6KE18CA voltage transient suppressor in the DeSlumpifier has an
operating voltage of about 15 volts. The super capacitors are rated
at 5 volts each, total of 20 volts for 4 in series. So the
DeSlumpifier could be powered by up to 15 volts without a problem.
There is also the FMEA consideration, more parts to fail.
Joe
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Yup, . . . so it may be that having a dc/dc converter
sized to the task is a lower parts count and probably
lower cost than trying to store the transient support
energy on capacitors alone.
Garmin could have foreseen this and designed their
inboard supply to accommodate the real-world of
vehicular DC power systems.
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
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| Posted: Thu Oct 10, 2013 5:37 am Post subject: Re: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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| Quote: | Garmin could have foreseen this and designed their
inboard supply to accommodate the real-world of
vehicular DC power systems. |
Actually it is a Dynon D-180, not Garmin. To be fair, the D-180 has an optional internal Li-ion backup battery which prevents brownouts. My backup battery died.
Joe
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Thu Oct 10, 2013 10:55 am Post subject: De-Slumpifier, Voltage Buffer to Prevent Brownout |
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At 08:37 AM 10/10/2013, you wrote:
| Quote: |
> Garmin could have foreseen this and designed their
> inboard supply to accommodate the real-world of
> vehicular DC power systems.
Actually it is a Dynon D-180, not Garmin. To be fair, the D-180 has
an optional internal Li-ion backup battery which prevents
brownouts. My backup battery died.
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Opps . . . apologies to Dynon. Nonetheless, tailoring
input power conditioning to accommodate starter inrush
brownout isn't a big task.
Bob . . .
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