DC-DC Mode all the time?

[Kelvin Teh]

Hi guys. Im currently using sigelei Mini 30w with a Subtank Mini on my device.

Ever since I changed to DC-DC mode 2 weeks ago, my PWM mode constantly having the problem of weak and slow firing.
Thus, I have to use DC-DC mode to meet my own satisfaction.

Problem here is:
1) does anyone face this kind of problem before? as in weak and delay firing in PWM Mode but working perfectly in DC-DC Mode?
2) Is that okay to use DC-DC Mode all the time? Does the wattage I set on my sigelei Mini affects the voltage or something? In PWM Mode, I have to put 20w to get the merely same performance as the 10w in DC-DC Mode.

TQ Guys and hope to here from ECF!

 

[ROADRAGE65]

There is another thread posted last night with the same problem with the Sigelei mini 30. Might want to check it out.

 

[ROADRAGE65]

Sorry just noticed you started that post to.

 

[roxynoodle]

I've never used the pwm as I hate that type of signal. It should be safe to leave it on DC. I would.

However, the other should be investigated in case there is a defect. Hope someone here can help.

 

[Kelvin Teh]

I've never used the pwm as I hate that type of signal. It should be safe to leave it on DC. I would.

However, the other should be investigated in case there is a defect. Hope someone here can help.

so you're using DC-DC all the time? Wondering will it be the battery problem?
From the thread previously, some people told that it might be the battery. Or I should clean the connections.

The problem is that, its only happening in PWM and its all working fine in DC-DC mode. That's what makes me curious and blur at the same time.

 

[roxynoodle]

I don't have this mod, but I had the ipv mini with the same chip. First thing I did was put it in DC-DC. I find a DC signal gives me a better vape experience. I'm not a fan of pwm at all so I admit I never even tried it.

Weekly I clean my contacts and 510 on all my mods, so that's a good idea.

Also check batteries at least periodically before and after charging so you know if your batteries and charger are working as they should.

 

[mesamay2003]

DC-DC mode will give a smoother vape, since it will only fire as low as the actual battery voltage, where PWM mode simulates voltage step down by pulsing...however, depending on your coil resistance, (low ohm coils) you may be running quite a bit hotter than than the wattage on the display shows. Use an ohm calculator to figure this out...I know it sounds confusing, and there is not much documentation on how PWM vs DC-DC modes are implemented.

 

[Innova]

I have an IPV mini. Dc mode all the time. No problems!

 

[Kelvin Teh]

I don't have this mod, but I had the ipv mini with the same chip. First thing I did was put it in DC-DC. I find a DC signal gives me a better vape experience. I'm not a fan of pwm at all so I admit I never even tried it.

Weekly I clean my contacts and 510 on all my mods, so that's a good idea.

Also check batteries at least periodically before and after charging so you know if your batteries and charger are working as they should.

I'm using Vappower Battery (when I bought it it was included in the package). Battery was fine but in DC-DC Mode it does drains up faster, which is quite understandable I guess？ Sorry man still new with all these VW Mod.

How do u clean the 510 and contacts? 510 is referring to the pin right? what bout contacts?

 

[Kelvin Teh]

DC-DC mode will give a smoother vape, since it will only fire as low as the actual battery voltage, where PWM mode simulates voltage step down by pulsing...however, depending on your coil resistance, (low ohm coils) you may be running quite a bit hotter than than the wattage on the display shows. Use an ohm calculator to figure this out...I know it sounds confusing, and there is not much documentation on how PWM vs DC-DC modes are implemented.

I did try to figure that out but it was so confusing to me.
What happen here is, when I vape at 17w, 0.5ohm OCC Coil, it showed 3.1v in DC-DC Mode.
In PWM Mode, 17w, 0.5ohm OCC Coil, it showed 2.9v.
There's always 0.2v reduction in PWM. which is not going to make any huge differences isnt it? But its so weak in PWM

 

[juggler86]

I cant even figure out how to switch modes on my Sig30. I read the little manual and did what it said but nothing happened. I dont really care cuz its workng good for me as is

 

[Kelvin Teh]

I cant even figure out how to switch modes on my Sig30. I read the little manual and did what it said but nothing happened. I dont really care cuz its workng good for me as is

at least its working for u man. Mine worked great at first but ended up being like this.
Thats what make me frustrated

 

[roxynoodle]

Clean contacts and 510 with alcohol on Q tips.

I'm not familiar with that battery and urge you to replace it with a Samsung 25r, LG He2 or Sony vtc4.

I need to lookup the specs of this chip again, but I don't think it has step down in DC mode. What that means is regardless of whether you have it set below 4.2v, it will output 4.2v with a fresh battery. So you can set it at 3.8v, but it won't vape there until the battery drains from 4.2v to 3.8v.

 

[Thrasher]

Not payin attention with a lack of caffeine.


What Bwh said is on it

 

[bwh79]

Does the wattage I set on my Sigelei Mini affects the voltage or something? In PWM Mode, I have to put 20w to get the merely same performance as the 10w in DC-DC Mode.

TQ Guys and hope to here from ECF!

You're not getting 10 watts from a Subtank in DC mode except maybe with the 1.2Ω coil and a nearly-dead battery. In DC mode there is no step-down, and it cannot fire any lower than the battery's voltage no matter where you have it set. So with the .5Ω coil, you're getting around 20-30 watts from that mode, regardless (battery voltage squared, times two). The reason it feels like you have to turn it way up in PWM mode to match the performance of DC mode, is because you do. Since you're not actually getting those low settings in DC mode, you do have to turn it way up in PWM mode to get the same high power output that you're getting in DC mode from any setting.

 

[Kelvin Teh]

Which mean regardless what wattage I put for DC-DC Mode it will still fire at the battery voltage depending on the fullness of the battery am I correct ?

 

[bwh79]

Which mean regardless what wattage I put for DC-DC Mode it will still fire at the battery voltage depending on the fullness of the battery am I correct ?

Basically, yeah. If the setting is lower than battery voltage, then in DC-DC mode it will just fire at battery voltage; in PWM mode it will pulse the power on and off very fast (30 or more times each second) such that when averaged over time, the voltage "seems" like less than that (each individual pulse, though, is just at full battery voltage still.)

If the setting is higher than battery voltage, it can still up-regulate to the required voltage, in either mode.

 

[thekraut]

I have the IPV Mini and the Sigelei Mini. The chip used in both is the same but not the version of it. IPV Mini uses SX130 V1.1 and the Sigelei Mini SX130 V1.5. The DC-DC mode on the Sigelei works a bit different than on the IPV... it's output on the Sigelei is not correct imo. For example I run a 1 ohm coil in it showing 22 watts at 5 volts. This should read 25 watts.... the DC-DC mode on my IPV shows the correct wattage/volts.

If you go for lower ohm coils I recommend using PWM as DC-DC does not offer any stepdown functionality!

 

[Kelvin Teh]

Basically, yeah. If the setting is lower than battery voltage, then in DC-DC mode it will just fire at battery voltage; in PWM mode it will pulse the power on and off very fast (30 or more times each second) such that when averaged over time, the voltage "seems" like less than that (each individual pulse, though, is just at full battery voltage still.)

If the setting is higher than battery voltage, it can still up-regulate to the required voltage, in either mode.

and since my PWM isnt working properly. Can i conclude that it is FINE to use DC-DC mode for everyday usage starting from now on?
Is it going to cause any consequences like short battery life or so?

 

[Kelvin Teh]

I have the IPV Mini and the Sigelei Mini. The chip used in both is the same but not the version of it. IPV Mini uses SX130 V1.1 and the Sigelei Mini SX130 V1.5. The DC-DC mode on the Sigelei works a bit different than on the IPV... it's output on the Sigelei is not correct imo. For example I run a 1 ohm coil in it showing 22 watts at 5 volts. This should read 25 watts.... the DC-DC mode on my IPV shows the correct wattage/volts.

If you go for lower ohm coils I recommend using PWM as DC-DC does not offer any stepdown functionality!

Personally been liking PWM as well but it just not working fine now. Delay firing and very weak vape.
I'll figure it out the way to fix it as I like PWM as well. It produces colder and smoother vape