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Old 06-13-2012, 02:17 AM   #1
kyleservicetech
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Default Dual Castle Creations ESC and uBEC Wiring

Update 03-25-14
The Digikey Shottky diode has become obsolete. Here is a replacement diode, rated at 12 Amps.

http://www.digikey.com/product-detai...5CT-ND/2179164


This is not a common requirement, but a few wattflyer readers have been flying high powered twin motor electric models. And they may have wondered if those Castle Creations ICE uBEC (Switching Battery Elimination Circuits) can be parallel connected for reliability.

It is not a good idea to directly parallel connect these switching power supplies due to poor load sharing and/or interaction between the two uBEC's.

One way around this issue is to isolate these two uBEC's from each other by a high current diode. Problem is, the usual diodes have a 3/4 volt voltage loss in this type of application. Nowdays, the Shottky diodes are available that operate with about 0.4 Volts drop at 9 amperes.

One concern with this type of setup is that the two separate battery/ESC/motor power systems have a single ground point, the two receiver servo connectors. I've beefed this up by wiring in a piece of #14 wire between the two black wires of the Castle Creations ESC battery inputs.

Take a look at the attached photos and JPG's of a setup I've put together for a club members electric Gulf Stream model. This model uses a pair of 5000 Mah 6 Cell LiPos for battery power, a pair of 100 Amp Castle Creations ICE ESC's, and a pair of 2000 watt fans.

Last night we wired up the two electric motors, the ESC's and the batteries for the Gulf Stream model.

More work needs to be done on this Electric model, but it will show up in Wattflyer after its maiden flights.


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Old 06-14-2012, 08:16 AM   #2
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There were several threads regarding problems with high speed digital servos and this circuit. RX did reset itself when some servos were moved fast. The idea was that the servo motor current spikes induced higher voltages on the RX power supply. Did not happen with every servo, just some.

That is similar to the problem with long wires between battery and ESC and the solution is the same: add a capacitor at the RX + and - . Without diodes the battery filters these problems, but with diodes it is separated from that part of the circuit and the RX has only very small capacitors built in.

And even if it isn't needed it doesn't harm :-)

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Old 06-14-2012, 08:11 PM   #3
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Originally Posted by r_kopka View Post
There were several threads regarding problems with high speed digital servos and this circuit. RX did reset itself when some servos were moved fast. The idea was that the servo motor current spikes induced higher voltages on the RX power supply. Did not happen with every servo, just some.

That is similar to the problem with long wires between battery and ESC and the solution is the same: add a capacitor at the RX + and - . Without diodes the battery filters these problems, but with diodes it is separated from that part of the circuit and the RX has only very small capacitors built in.

And even if it isn't needed it doesn't harm :-)

RK
Do you have the threads involved?

I'm planning on checking receiver voltage with my Tektronix oscilloscope before the maiden flights on this Gulf model. Should not be a problem with two Castle Creations ICE uBEC's feeding everything.

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Old 06-15-2012, 12:32 PM   #4
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Originally Posted by kyleservicetech View Post
Do you have the threads involved?
(sorry, but most in german)

http://members.aon.at/flug.fiala/sicher.html#4
But there is only a mention of (S)PCM RX. I don't know if it concerns 2G4, too.

http://www.rclineforum.de/forum/boar...zen-auf-der-e/

http://www.rc-network.de/forum/showt...-ben%C3%B6tigt

(german page, but partly in english)
http://www.rc-network.de/forum/showt...9dioden/page11

(finally an english written thread)
http://www.rcgroups.com/forums/showt...1077649&page=2

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Old 06-15-2012, 05:18 PM   #5
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Originally Posted by r_kopka View Post
(sorry, but most in german)

http://members.aon.at/flug.fiala/sicher.html#4
But there is only a mention of (S)PCM RX. I don't know if it concerns 2G4, too.

http://www.rclineforum.de/forum/boar...zen-auf-der-e/

http://www.rc-network.de/forum/showt...-ben%C3%B6tigt

(german page, but partly in english)
http://www.rc-network.de/forum/showt...9dioden/page11

(finally an english written thread)
http://www.rcgroups.com/forums/showt...1077649&page=2

RK
Thanks for your response.

It looks like some of these threads deal with using silicon diodes as kind of a "voltage reducer" to allow running a standard receiver directly off of a two cell LiPo battery. Nothing wrong with that, I've done it myself.

Which is why my drawings required a nine ampere Shottky diode, which has 1/2 the voltage drop of a silicon diode. Similar setups with these Shottky diodes have been used in a few club members models without issues.

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Old 10-23-2012, 12:20 AM   #6
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Wow guys, info overload! Thank all of you for your help. I will give all of this a try.
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