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11-12-2018 01:08 PM  13 months ago
Topic Vote0Post 1
A&J

rrApprentice

Hudson FL 34667

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SChottky diode
Does this really work well they claim it will handle 45 volts
And up to 15 amps

That you can run a small receiver pack as backup

Looking forward to your comments

I run all high voltage stuff with no regulators
And no problems on a 2 cell

I just don't trust esc
Thinking about getting a foamme

Watch at YouTube

Lets do the time warp againnn !
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11-12-2018 02:51 PM  13 months ago
ssmith512

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Indianapolis, IN USA

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Yes they work. They have been used in the scale community for a wile for dual RX pack redundancy purposes.Steve
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11-12-2018 03:00 PM  13 months ago
A&J

rrApprentice

Hudson FL 34667

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Sweet
Even the price of foamies are not cheap
Lets do the time warp againnn !
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11-12-2018 05:58 PM  13 months ago
ticedoff8

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Morgan Hill, CA. USA

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Diodes of many kinds have been used as a "poor man's battery backup" for decades (generations?).
But, if it was that simple, then they would be used by everyone.
There are drawbacks:
* Voltage loss through the diode (.7v at least)
* Current through the diode turns to heat - so the diode may need to be really big to handle the current.
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
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11-12-2018 06:13 PM  13 months ago
A&J

rrApprentice

Hudson FL 34667

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Yes I agree got to be careful
This little diode has sparked my interest
Seems to behave differently
Then other diodes
It's just for backup power only
I did run across this

Obviously I'm not electrical engineer

Watch at YouTube

Lets do the time warp againnn !
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11-13-2018 05:48 AM  13 months ago
rcflyerheli

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Granbury, TX USA

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I guess I am screwed up, as I'm not following how a diode can work as a battery/BEC backup. I thought diodes were mainly used to prevent reverse current in a circuit line, or to be used as lights (LED). I did not know they could store energy.Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep
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11-13-2018 07:51 AM  13 months ago
wjvail

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Meridian, Mississippi

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rcflyerheli I guess I am screwed up, as I'm not following how a diode can work as a battery/BEC backup. I thought diodes were mainly used to prevent reverse current in a circuit line, or to be used as lights (LED). I did not know they could store energy.
I'm just kinda lurking in this thread but I think the idea is that the diode is supplying the switching between two power sources. It is not the alternate power for the backup but the switching between two. It is the battery backup facilitator, not the backup itself. Clear as mud?
"Well, nothing bad can happen now."
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11-13-2018 10:45 AM  13 months ago
dgoss999

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UK - Lancashire

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I think the idea is to stop the good battery discharging into the failing one... Both batteries will supply current through a forward biased diode. Hence the issue of the diode forward voltage drop!"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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11-13-2018 12:23 PM  13 months ago
A&J

rrApprentice

Hudson FL 34667

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That's right
Used only as a backup
I'll be able to put a small battery in the plane if the ESC fails it will switch to the battery. that I put in. saving the plane hopefully
They also make them in 20 amp and 45 volts .. is the one I'm going to try..

I guess the bottom line some insurance is better than no insurance
Lets do the time warp againnn !
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11-13-2018 12:28 PM  13 months ago
KevinB

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Earth

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For $25, here is a commercially available version of what you're looking for. I've been using one on my Logo700 for 2 seasons now.
http://www.western-robotics.com/BBFR

KevinB
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11-13-2018 12:56 PM  13 months ago
A&J

rrApprentice

Hudson FL 34667

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Kind of the same but they're doing it on the voltage side to the BEC
This will go on the receiver side of the BEC

That way if the ESC BEC fails
It will switch to the battery

Look at the wiring in the first video.. you can see what I'm saying

Thank you
Lets do the time warp againnn !
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11-13-2018 04:41 PM  13 months ago
wjvail

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Meridian, Mississippi

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KevinB For $25, here is a commercially available version of what you're looking for. I've been using one on my Logo700 for 2 seasons now.
http://www.western-robotics.com/BBFR
Very nice find. Thanks for sharing. Do you know, do they offer an option other than Deans? While I have 100s of pairs of Deans around here, I'm trying to move away from them.
"Well, nothing bad can happen now."
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11-13-2018 04:47 PM  13 months ago
ticedoff8

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Morgan Hill, CA. USA

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The simple diode protection is not even close to how the Perfect Regulators "Pro Guard +", WD or the OptiPower "UltraGaurd 430" backup systems work.
As I said, if it was that simple, eveyone would be doing it.

The diodes may protect against a total failure of one of the sources, but does not account for normal voltage variations of the source.
And, there is a significant voltage drop across the diodes.

The main issue is that there is no way to guarantee that the BEC / main batt is supplying the power.
Depending on the voltage output difference between the main power source and the "backup", the "backup" batt could be supplying all the power until the voltages equalize.
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
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11-13-2018 04:50 PM  13 months ago
A&J

rrApprentice

Hudson FL 34667

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They're using the same type of diods they're using two singles
According to steamatic
That's posted

Would that be better than the other type

I do see what you're saying about the voltage drop
Lets do the time warp againnn !
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11-14-2018 09:16 PM  12 months ago
AirWolfRC

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42½ N, 83½ W

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Using two diodes to keep the higher voltage power source from "charging" the lower voltage source is an old concept.

Using Schottky vs silicon diodes helps keep from wasting power in the diodes because of the lower forward voltage drop.

Using two diodes in the same housing vs two separate diodes is a matter of convenience.

The voltage rating only needs to be a safety margin more than the higher input voltage. If the BEC puts out 7V and stand by pack is 4.8V then the diode voltage rating should be something more than 7 volts. 10V or 15V will do.

Current rating needs to be the at least the maximum current expected to the RX and all servos & gyros etc.

Back to the first comment, a circuit could be made to charge (in a controlled manner) the stand by pack from the higher voltage main source while the system is "on" so you don't have to keep charging the stand by pack separately.
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11-15-2018 08:47 PM  12 months ago
cudaboy_71

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sacramento, ca, u.s.

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for $25 I use the scorpion backupguard, which includes the lipo, and a switch. just remember to turn it on after your power up the heli normally. added bonus of having a way to power your electronics to set up FBL without having to energize the esc/motor.

there are pros and cons to all the above-mentioned solutions. I prefer this one and it has saved two helis a total of 4 times over the past 3 years; twice due to my poor soldering and an EC5 coming off in flight, once due to a pack connector coming apart in flight, and once when my main pack wire finally got cut through by the frame and shut down the ESC. All four my fault completely. But, all 4 autoed down safely because I had a cheap backup system running.
if it ain't broke, break it.
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11-16-2018 12:48 PM  12 months ago
KevinB

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Earth

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wjvail Very nice find. Thanks for sharing. Do you know, do they offer an option other than Deans? While I have 100s of pairs of Deans around here, I'm trying to move away from them.
Deans only as far as I know.

The way I use it is I have a small 2s lipo on one input that I only keep charged to Storage charge. That way, it can stay like that indefinitely without hurting the lipo. There is still plenty of juice in it for an emergency. I set my WR bec to 7.4V. This is wired into the RX directly. I have an RX voltage warning set in the Tx just over the buffer battery voltage. That gives me warning from the Tx as soon as I'm on the backup battery. Last summer, I only topped the backup lipo charge to a full storage charge twice....and most of that was probably from the LED charge indicator I have on the backup circuit. This setup saved my Logo700 when the Tribunus BEC decided to turn off mid flight while I still had motor power. Went back to the WR BEC after that.

Kevin
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11-16-2018 12:53 PM  12 months ago
A&J

rrApprentice

Hudson FL 34667

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Exactly what I'm afraid of
Running ESC with a BEC

That's why I've been asking questions
Lets do the time warp againnn !
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11-16-2018 11:25 PM  12 months ago
Ace Dude

rrProfessor

USA

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A&J Exactly what I'm afraid of
Running ESC with a BEC

That's why I've been asking questions
Use a KONTRONIK ESC and you won't have to worry, their ESCs have the best BECs in the business.
  
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11-17-2018 07:43 AM  12 months ago
ticedoff8

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Morgan Hill, CA. USA

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Use a KONTRONIK ESC and you won't have to worry, their ESCs have the best BECs in the business.
Until the EC5 connector on the main battery unsolders and you lose the power to the ESC / BEC.
Then you watch the heli fall to the ground in a heap.
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
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