Today's Message Index:
----------------------
1. 05:34 AM - Re: Brown Out Bus Functionality (Shaun Ellis)
2. 11:35 AM - Re: Brown Out Bus Functionality (Peter Pengilly)
3. 12:36 PM - Re: Brown Out Bus Functionality (Charlie England)
Message 1
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| Subject: | Re: Brown Out Bus Functionality |
Thank you both! That all makes sense. Other than the GAD 27 running an
MFD I didn=99t get the additional device.
Have a great day!
Shaun
> On Nov 5, 2024, at 7:33=AFPM, David Carter <david@carter.net>
wrote:
>
> I used the 8-amp version of this device
(https://www.tcwtech.com/product/intelligent-power-stabilizer/) to
provide this capability to most of my brownout-critical devices, plus
the Garmin GAD 27's keep-alive function to provide brownout protection
to one additional device (my MFD) that would have otherwise been over
the TCW's 8A rating.
>
>
> ---
> David Carter
> david@carter.net <mailto:david@carter.net>
>
> On Tue, Nov 5, 2024 at 8:15=AFPM Charlie England
<ceengland7@gmail.com <mailto:ceengland7@gmail.com>> wrote:
>>
>>
>> On Tue, Nov 5, 2024 at 6:39=AFPM Shaun Ellis
<shaunwellis@gmail.com <mailto:shaunwellis@gmail.com>> wrote:
<shaunwellis@gmail.com <mailto:shaunwellis@gmail.com>>
>>>
>>> I=99m new to the list (and aircraft wiring) so forgive me if
this is redundant or should be self-explanatory, but, can someone
explain or point me towards info regarding how the brown out bus
actually prevents brown out of the equipment during engine starts?
I=99ve been trying to understand Z101 and I can=99t figure
out what prevents the voltage drop of the BO bus during starts. Thanks!
>> Hi Shaun; welcome aboard!
>>
>> The secret sauce in the brownout bus circuit is the stuff in green
(if you're looking at it on a computer or a color print) labeled
'brownout booster'. It's simply a solid state inverter style 'boost
converter-regulator', that takes a DC voltage from the heavily loaded
battery, chops it up into sorta-AC, runs it through what amounts to a
transformer to raise the voltage, and converts it back to DC. The
devices typically control output voltage (regulate it) by varying the
'duty cycle' of the sorta-AC.
>>
>> The gadget gets switched in/out of the system by the associated relay
& switch terminals.
>>
>> It's been a while since I've needed to pay attention to that Z
figure, so I can't remember the part/model number of the converter, but
it should be in the docs somewhere. Also, there are many devices
available from the usual online ordering sources that will do the same
job.
>>
>> Hope that helps,
>>
>> Charlie
>>
>>
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Message 2
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| Subject: | Brown Out Bus Functionality |
Depending what is in your panel the 4 amp version may be adequate. One
screen, the AHRS, Engine interface (eg GEA 24 or similar) and possibly
the GPS (don=99t want to have to enter the flight plan again) is
all that is really required. The GAD 27 has some of the same
functionality so make take the place of the TCW brick, although some
think the GAD 27 just adds complexity for not much gain.
Peter
From: owner-aeroelectric-list-server@matronics.com
<owner-aeroelectric-list-server@matronics.com> On Behalf Of Shaun Ellis
Sent: 06 November 2024 13:34
Subject: Re: AeroElectric-List: Brown Out Bus Functionality
Thank you both! That all makes sense. Other than the GAD 27 running an
MFD I didn=99t get the additional device.
Have a great day!
Shaun
On Nov 5, 2024, at 7:33=AFPM, David Carter <david@carter.net
<mailto:david@carter.net> > wrote:
I used the 8-amp version of this device
(https://www.tcwtech.com/product/intelligent-power-stabilizer/) to
provide this capability to most of my brownout-critical devices, plus
the Garmin GAD 27's keep-alive function to provide brownout protection
to one additional device (my MFD) that would have otherwise been over
the TCW's 8A rating.
---
David Carter
david@carter.net <mailto:david@carter.net>
On Tue, Nov 5, 2024 at 8:15=AFPM Charlie England
<ceengland7@gmail.com <mailto:ceengland7@gmail.com> > wrote:
On Tue, Nov 5, 2024 at 6:39=AFPM Shaun Ellis
<shaunwellis@gmail.com <mailto:shaunwellis@gmail.com> > wrote:
<shaunwellis@gmail.com <mailto:shaunwellis@gmail.com> >
I=99m new to the list (and aircraft wiring) so forgive me if this
is redundant or should be self-explanatory, but, can someone explain or
point me towards info regarding how the brown out bus actually prevents
brown out of the equipment during engine starts? I=99ve been
trying to understand Z101 and I can=99t figure out what prevents
the voltage drop of the BO bus during starts. Thanks!
Hi Shaun; welcome aboard!
The secret sauce in the brownout bus circuit is the stuff in green (if
you're looking at it on a computer or a color print) labeled 'brownout
booster'. It's simply a solid state inverter style 'boost
converter-regulator', that takes a DC voltage from the heavily loaded
battery, chops it up into sorta-AC, runs it through what amounts to a
transformer to raise the voltage, and converts it back to DC. The
devices typically control output voltage (regulate it) by varying the
'duty cycle' of the sorta-AC.
The gadget gets switched in/out of the system by the associated relay &
switch terminals.
It's been a while since I've needed to pay attention to that Z figure,
so I can't remember the part/model number of the converter, but it
should be in the docs somewhere. Also, there are many devices available
from the usual online ordering sources that will do the same job.
Hope that helps,
Charlie
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Message 3
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| Subject: | Re: Brown Out Bus Functionality |
I thought TCW only made backup battery type devices until I looked up that
model. Now that I've recovered my breath and got the old heart pumping
again....
Is that thing space-certified?
$5 boost-buck converter and a $1 fat zener for OV accomplishes the same
thing.
FWIW, for several years I've been running a cheap adjustable boost-buck
converter, adjusted to around 12V (below the normal a/c bus level while
running), hardwired from the endurance bus to the aux power input on my
EFIS. Works fine, lasts a long time; two wires to hook up. Well, three;
gotta have a ground. No extra relays, switch terminals, etc at all.
With the output setpoint below normal bus voltage, it's not carrying any
load whatsoever during normal operation. It only carries a load during
starting.
FWIW,
Charlie
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On Wed, Nov 6, 2024 at 1:38=AFPM Peter Pengilly <peter@sportingaero.c
om>
wrote:
> Depending what is in your panel the 4 amp version may be adequate. One
> screen, the AHRS, Engine interface (eg GEA 24 or similar) and possibly th
e
> GPS (don=99t want to have to enter the flight plan again) is all th
at is
> really required. The GAD 27 has some of the same functionality so make ta
ke
> the place of the TCW brick, although some think the GAD 27 just adds
> complexity for not much gain.
>
>
> Peter
>
>
> *From:* owner-aeroelectric-list-server@matronics.com <
> owner-aeroelectric-list-server@matronics.com> *On Behalf Of *Shaun Ellis
> *Sent:* 06 November 2024 13:34
> *To:* aeroelectric-list@matronics.com
> *Subject:* Re: AeroElectric-List: Brown Out Bus Functionality
>
>
> Thank you both! That all makes sense. Other than the GAD 27 running an MF
D
> I didn=99t get the additional device.
>
>
> Have a great day!
>
>
> Shaun
>
>
> On Nov 5, 2024, at 7:33=AFPM, David Carter <david@carter.net> wrote
:
>
>
> I used the 8-amp version of this device (
> https://www.tcwtech.com/product/intelligent-power-stabilizer/) to provide
> this capability to most of my brownout-critical devices, plus the Garmin
> GAD 27's keep-alive function to provide brownout protection to one
> additional device (my MFD) that would have otherwise been over the TCW's
8A
> rating.
>
>
> ---
> David Carter
> david@carter.net
>
>
> On Tue, Nov 5, 2024 at 8:15=AFPM Charlie England <ceengland7@gmail.
com>
> wrote:
>
>
> On Tue, Nov 5, 2024 at 6:39=AFPM Shaun Ellis <shaunwellis@gmail.com
> wrote:
>
> shaunwellis@gmail.com>
>
> I=99m new to the list (and aircraft wiring) so forgive me if this i
s
> redundant or should be self-explanatory, but, can someone explain or poin
t
> me towards info regarding how the brown out bus actually prevents brown o
ut
> of the equipment during engine starts? I=99ve been trying to unders
tand Z101
> and I can=99t figure out what prevents the voltage drop of the BO b
us during
> starts. Thanks!
>
> Hi Shaun; welcome aboard!
>
>
> The secret sauce in the brownout bus circuit is the stuff in green (if
> you're looking at it on a computer or a color print) labeled 'brownout
> booster'. It's simply a solid state inverter style 'boost
> converter-regulator', that takes a DC voltage from the heavily loaded
> battery, chops it up into sorta-AC, runs it through what amounts to a
> transformer to raise the voltage, and converts it back to DC. The devices
> typically control output voltage (regulate it) by varying the 'duty cycle
'
> of the sorta-AC.
>
>
> The gadget gets switched in/out of the system by the associated relay &
> switch terminals.
>
>
> It's been a while since I've needed to pay attention to that Z figure, so
> I can't remember the part/model number of the converter, but it should be
> in the docs somewhere. Also, there are many devices available from the
> usual online ordering sources that will do the same job.
>
>
> Hope that helps,
>
>
> Charlie
>
>
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>
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