Ferrite tube for charging cables?

[Mad Armour]

Was going through Schulze's website. seems like they recommend ferrite tubes for the charging cables to minimise EMV interference?

Anyone here used the ferrite tubes?

Cheers!

Schulze

[X34]

Was going through Schulze's website. seems like they recommend ferrite tubes for the charging cables to minimise EMV interference?

Anyone here used the ferrite tubes?

Cheers!

Schulze

Its a CE requirement, any power wires longer than 15cm are required to install the ferrite core(FC)aka "polo mint". Otherwise it will cause interference, even in the airplane/heli, they are required to install this FC to prevent glitches. If u are running non PCM, apd receivers, it is strongly recommended to install the FC.

U can get it from SLT for $0.20 each for the small ones and big ones 50 cents.

[Mad Armour]

Its a CE requirement, any power wires longer than 15cm are required to install the ferrite core(FC)aka "polo mint". Otherwise it will cause interference, even in the airplane/heli, they are required to install this FC to prevent glitches. If u are running non PCM, apd receivers, it is strongly recommended to install the FC.

U can get it from SLT for $0.20 each for the small ones and big ones 50 cents.

Thanks! Looks like time to head to SLT to get the polo mints! Funny no one ever mentions this. Most impt thing is, is the inteference gonna effect the charging process?

[Simys]

Don't bother too much on the ferrite choke. Without it your charger can still live with it.

Ferrite choke was commonly used to prevent noisy device from leading into the main source (power supply). Since we are charging battery and yet the battery don't produce noise, therefore I don't see a need in doing that.

[X34]

Don't bother too much on the ferrite choke. Without it your charger can still live with it.

Ferrite choke was commonly used to prevent noisy device from leading into the main source (power supply). Since we are charging battery and yet the battery don't produce noise, therefore I don't see a need in doing that.

In this application, its is to suppress emv, for R/c application is to prevent glitches. This practice has been in use in Europe for more than 30 years, recently, the Americans are adopting this practice as well. Especially the electric flyers. Check out E-zone, there are quite a few threads talking about it. If most of your charging is done at home don't bother about the FC, if u do field charging, to be considerate to other flyer, should install the FC.

Some of them put this polo mint on the esc throttle wire to reduce glitch.

Little off topic- batteries do produce noise in the form of "ripple", this form of noise become more apparent when the batt wire is long. CC talks about this problem as well. Lipo is the worst culprit.

[9VDXN]

Ohhh...then you're wrong when it comes to charging NiMH batts.....because noise can affect the voltage stability as well....so it will give false peak to the battery, causing the charger to terminate charge prior to battery being fully charged...

If you're using a good and stable power supply, it makes no diff, but if you're using those cheapo wall-mart type of powersupply, then it does make a lot of difference.

[9VDXN]

Sorry, I'm referring to SimYS's reply....not X34's reply coz james is absolutely right about it...

[Mad Armour]

Don't bother too much on the ferrite choke. Without it your charger can still live with it.

Ferrite choke was commonly used to prevent noisy device from leading into the main source (power supply). Since we are charging battery and yet the battery don't produce noise, therefore I don't see a need in doing that.

I see, no wonder not many ppl are tokking about this. Guess I don't need them then, coz I do my charging mainly at home. Maybe just buy a few, just in case I have to do emergency in-field charging.

Thanks for your info.

Cheers!

[Mad Armour]

In this application, its is to suppress emv, for R/c application is to prevent glitches. This practice has been in use in Europe for more than 30 years, recently, the Americans are adopting this practice as well. Especially the electric flyers. Check out E-zone, there are quite a few threads talking about it. If most of your charging is done at home don't bother about the FC, if u do field charging, to be considerate to other flyer, should install the FC.

Some of them put this polo mint on the esc throttle wire to reduce glitch.

Little off topic- batteries do produce noise in the form of "ripple", this form of noise become more apparent when the batt wire is long. CC talks about this problem as well. Lipo is the worst culprit.

I guess the polo mints are for 'responsible' rc!

Another thing I want to ask you. Schulze does not recommend using PSU (even a regulated one) as a power source for their chargers, preferring a car battery instead. They say that a PSU may actually damage the charger. I'm actually quite concerned about that, coz we have been happily using the PSU.

[Simys]

9VDXN, the statement that I have made was up to the you and the rest to believe it or not. I won't make any further arguement with that what you have said. You have a certain degree of correctness but that didn't mean all were correct.

A very simple test that everyone could try. Take a pack of batteries and measured under an oscilloscope, will you going to see noise? I bet you should known the answer!

The only possible way that would cause the charger to be false triggered is noise from the unregulated power supply. The ferrite choke is more suitable to place between the power supply and the charger. It helps to filter away the frequency noise to prevent the charger from false triggering.

As in field charging, it will not help much even if you have the ferrite choke placed between the charger and the batteries because your linkage wires would pick up the electromagnetic energy from the nearby transmitter. This EMC (Electro-Magnetic Coupling) level would be greatly depended on how far the transmitter is away from the mobile charger and the charging cable length. If the charging wires before and after the ferrite choke are going to pick up the noise, for sure the charger will be false triggered. The ferrite choke willnot help at all.

Just an advise to all of you reading this article, there were so many informations in the internet. Whatever people had written and presented, that didn't mean they were 100% correct. Perhaps, that piece of informations was valid at the time only. Even scientists do make mistake. A very good example was current movement. It didn't flow from positive to negative. We known that the electrons that created the current flow rather than the holes.

[X34]

Are we talking about ferrite choke or ferrite core
Choke is clamp onto the wire, core is wire coiling onto it.

They are 2 different things right?

Simys, I don't have/can't get access to a oscilloscope, can u scope a pack of batt underload? I'm interested to know how it behaves.

Cheers

James

[X34]

I guess the polo mints are for 'responsible' rc!

Another thing I want to ask you. Schulze does not recommend using PSU (even a regulated one) as a power source for their chargers, preferring a car battery instead. They say that a PSU may actually damage the charger. I'm actually quite concerned about that, coz we have been happily using the PSU.

You can use PSU, it is not pratical not to use PSU, how are u gonna charge your source batt? I think their reason for not recommending is many people use dirty PSU, and it can cause problem to the charging program, if u use a cpu power supply, it is very good. Secondly, Schulze is selling PSU too, check out their website under accessories.

Cheers

James

[Simys]

When the wire goes round the ferrite core, it is going to perform exactly as ferrite choke, to minimize the noise from getting through the other side.

I could upload the picture if I could find the time to do it in my working place as I am quite busy lately.

[Mad Armour]

You can use PSU, it is not pratical not to use PSU, how are u gonna charge your source batt? I think their reason for not recommending is many people use dirty PSU, and it can cause problem to the charging program, if u use a cpu power supply, it is very good. Secondly, Schulze is selling PSU too, check out their website under accessories.

Cheers

James

Hahahahaha......thanks for your info. Much appreciated!

[X34]

When the wire goes round the ferrite core, it is going to perform exactly as ferrite choke, to minimize the noise from getting through the other side.

I could upload the picture if I could find the time to do it in my working place as I am quite busy lately.

That would be great,

Thanks

James