Today's Message Index:
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0. 12:54 AM - Coming Soon - The List of Contributors - Please Make A Contribution Today! (Matt Dralle)
1. 02:46 PM - Brown Out Bus Functionality (Shaun Ellis)
2. 05:14 PM - Re: Brown Out Bus Functionality (Charlie England)
3. 05:36 PM - Re: Brown Out Bus Functionality (David Carter)
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| Subject: | Coming Soon - The List of Contributors - Please Make |
A Contribution Today!
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Message 1
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| Subject: | Brown Out Bus Functionality |
Im 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? Ive been trying to understand Z101 and I cant figure out
what prevents the voltage drop of the BO bus during starts. Thanks!
Message 2
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| Subject: | Re: Brown Out Bus Functionality |
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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Message 3
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| Subject: | Re: Brown Out Bus Functionality |
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.co
m> 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
is
>> redundant or should be self-explanatory, but, can someone explain or poi
nt
>> me towards info regarding how the brown out bus actually prevents brown
out
>> of the equipment during engine starts? I=99ve been trying to under
stand 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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>
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