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HomeAircraftHelicopterHelicopter Main Discussion › Bec vs Regulator
04-01-2009 12:11 PM  9 years agoPost 1
tarzan_eb

rrApprentice

Central Illinois USA

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How many people use a bec instead of a regulator?
It's my understanding that a regulator burns off the extra voltage but a switching bec does not so why not use a bec so you are not just burning off that extra voltage. Can you help me understand this?

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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04-01-2009 12:29 PM  9 years agoPost 2
chris6414

rrApprentice

Sneads Ferry, NC USA

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BEC is a regulator
My understanding is that a BEC IS, a regulator. It's acronym came from the electric flying world in that it eliminates a seperate circuit within a ESC. I used one on my 450 and it helped the ESC run cooler. Not sure if the newer high end regulators that the nitro flyers are using are switching regulators but the ones you describe are linear regulators that do indeed, burn off the excess voltage as heat and are inefficient as far as regulators go. A switching regulator can also get hot depending on the load but can be made smaller due to not having to have large heat sinks to dissipate all that heat.

Century Hawk Sport, OS .32, Futaba 7C, GY-601 9251
Predator Gasser SE G-23, Fut 3010 servos, JR gyro/servo

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04-01-2009 12:39 PM  9 years agoPost 3
stanc

rrKey Veteran

Conroe, TX

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Personal preference for one, another is that most BECs don't handle enough amps. for some fliers, their HV servos and the style of flying. I use koolflight UBECs, they are rated at 3 amps continuous and 5 amps for 5 minutes. ESC that have a built in BEC aren't usually rated for enough amps for some pilots. However there are some that the amp rating is high enough.
A Jive for example:
HV types for 5-12s Lipos
BEC current continuous: 5A
BEC current max.: 15A
BEC voltage: 5,5V
BEC adjustable with ProgCARD II: 5-6V
BEC short circuit protection

Stan
2- Logo 500
Ion X2
eAvro90

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04-01-2009 12:45 PM  9 years agoPost 4
nivlek

rrProfessor

Norfolk England

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A 'bec' means 'battery eliminator circuit' , and is used on electric powered machines to power the receiver and servos from the main battery - eliminating the need for a dedicated receiver battery .
If you have a dedicated receiver battery , you are not using a 'bec' .

A 'bec' circuit is a regulator and can be either of the switching type or linear type .

A linear regulator is very inefficient and regulates the output voltage by converting unused energy into heat . The higher the input voltage , the less efficient it becomes and either it's cooling needs to be increased or it's output current has to be reduced to avoid overheating . They are not really suitable for anything supplied by more than three cell lipo packs , and then only on small machines like 450 size helis at most .

Linear regulators designed to be used with their own dedicated battery are intended for two cells only , with more than two cells , they will overheat .

A switching regualtor is much more efficient and can be used with much higher input voltages with no problems . The disadvantage with a switching regulator is that they are electrically more noisey than a linear regualtor .

At the end of the day , it gets dark .

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04-01-2009 03:00 PM  9 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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Both types -- switching regulator and linear regulator convert one DC voltage from one level to a second level. In most cases in the RC world, they are used to convert a higher voltage to a lower voltage.

The design goal for a regulator is to have it deliver a constant output voltage, regardless of varying load conditions, and varying input conditions.

A linear regulator, in simple terms, acts much like a resistor inserted between your power source, and the load. It's designed to deliver a set output voltage, while dropping the excess input voltage across a variable resistance. The voltage drop across the pass element ends up generating heat (power = volts x current). For large voltage differences (input to output), and for larger currents, the heat generated can be pretty darn impressive. For small currents and small voltage differentials, they are cheap, reliable, and do a pretty good job. Their efficiency, however, sucks.

A switching regulator uses a low power oscillator to "chop" the DC input voltage, turning it into an AC signal. Whether the regulator goes on to use some of the neat characteristics of capacitors, inductors, or transformers, the end result is that you get a very well regulated, DC voltage output, usually can have a wider input to output voltage differential, and the conversion efficiency can go as high as 95%. With the increased efficiency, much less heat is generated by the device, they run cooler, and your battery simply lasts longer between charges. Since there's some form of internal oscillator that makes the "switching" happen, this form of regulator can produce electrical and RF noise. Good switching regulators have decent filters on their outputs to reduce the electrical noise to a minimum, and are shielded to reduce any radiated noise.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-01-2009 03:56 PM  9 years agoPost 6
TJinGuy

rrProfessor

Socorro, NM - USA

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Aside from what a BEC really is, I have noticed the industry has started calling BECs things that you use on electrics off the main battery and regulators things that you use with a separate 2s lipo on a big birds like nitros and 600 sized electrics.

- Chris

Team New Mexico
TJinTech

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04-02-2009 12:01 PM  9 years agoPost 7
tarzan_eb

rrApprentice

Central Illinois USA

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Part 2
Is anybody useing a bec on a 50 size with success? I hate the fact that I'm just wasting the part of my battery that gets burnt off in heat,and that I am limited to just 7.4 volt battery instead of 11.1 Is there a switching regulator on the market?? Or a switching bec that is capable of suppling enough amps for a 50 size heli running 8311s/8717s gv1 and solid g

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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04-02-2009 12:41 PM  9 years agoPost 8
fenderstrat

rrProfessor

Aston,Pa

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I am using a CC 10A bec on my 50, I run it from a 3s 2200mah lipo works great for me.simple, light,effective

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04-02-2009 12:45 PM  9 years agoPost 9
hockeyrules99

rrApprentice

topeka KS

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I have used a UBEC on 11 volts with my vibe 90 and 9252 and 611 gyro. It worked great and I flew the same set up on my raptor 50 for a long time. I would not use it with 8717s though. The 8717s are power hungry and although it may work, I wouldn't gamble with it.

John

Ps if you are looking to try one I have two that I no longer use. I switched to Reactor X. I would sell you one or both.

weekend yet?

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04-02-2009 02:38 PM  9 years agoPost 10
Big Fil

rrKey Veteran

Santa Rosa, CA

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I've been using a Medussa 3.5A BEC with 9451s in my Trex 600 and a Western Robotics Hercules 5A BEC with 8717s on my Logo 500vbar. No problems with either in 3 years of combined usage.

WR also has a new BEC that is switchable all the way up to 8V output and is rated at 10A continuous.

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04-02-2009 03:45 PM  9 years agoPost 11
nivlek

rrProfessor

Norfolk England

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I've got one of these to try sometime .

http://www.hobbycity.com/hobbycity/...UBEC_for_Lipoly

I intend to fit it with heavier duty wires , probably two sets on the output side , then check it out at work to see if I judge it to be fit for a heli .

At the end of the day , it gets dark .

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04-02-2009 03:49 PM  9 years agoPost 12
TJinGuy

rrProfessor

Socorro, NM - USA

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I use a CC10 with an old 450 LiPo in my Raptor 30. It is running almost all digitals and seems to work great so far. Only problem is that you can't just leave it plugged in all the time and use the switch. I am assuming eventually the bec would drain the lipo and kill it. So I plug it in at the start of flying and use the switch between flights. Then I unplug it afterwards.

- Chris

Team New Mexico
TJinTech

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04-02-2009 03:54 PM  9 years agoPost 13
hornet dave

rrKey Veteran

Cedar Rapids, IA USA

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here's a little tip: put the switch between the battery and the BEC!

I've been OK using the castle BEC with futaba 9451's and 9250's and a 3S battery, but I just switched my 50 over to Align 610's and with those servos the castle BEC cuts out and causes the futaba RX to reset as the voltage falls down to around 3 volts when you quickly move the collective stick. This is on a CCPM heli.

I got a fever! The only prescription is MORE 6HV

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04-02-2009 04:16 PM  9 years agoPost 14
TJinGuy

rrProfessor

Socorro, NM - USA

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I thought about that but then I would have to rewire the switch or make adapters or whatever. But the good news is that the current passing through the switch would drop by over half and that can't hurt. I might still do it but for now I just unplug it after flying.

- Chris

Team New Mexico
TJinTech

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