Confused about Step up and Step Down

[jamal01]

Hey

So I have a question about vv/vw devices.

I understand some have both, but for the ones that are exclusive:

step up: increase voltage, increase current
step down: decrease voltage, decrease current



Now my IPV2 was firing beautifully at 7 watts and 0.2, which made me realize it lacked step down. So if at 0.2ohms the IPV2 is displaying 7 watts but what is it really firing at and how do i figure that out =/

Thanks!

 

[ignotus]

I think that if it lacks step-down capability, it can't fire lower than the voltage of the battery. Therefore it would have been firing at whatever the battery's charge was at the time.

 

[catalinaflyer]

So in order for your IPV2 to fire .2 ohms at 7 watts would require a voltage of 1.183.

Now with all of that, assuming the IPV2 doesn't have step-down and your battery was near completely discharged at 3.3 volts you'd be firing at 54.45 watts or on a fully charged battery at 4.2 volts you'd be hitting 88.2 watts.

Edit: To calculate it just Google Ohms Law or if you have a smrat fone then there are numerous Ohms Lay calculators that you can get then just input 2 parts of the equation to get the result.

 

[jamal01]

Hey

thanks for the reply ignotus. I looked at the specs of the ipv3 and then came to a conclusion which I hope is write (because if it doesn't then I am confused on a whole other level)

Output Voltage: 3.6V-8.5V

This would mean the device is not capable of firing below 3.6V. So if I build a 0.2 ohm coil...7 watts would mean 1.18 volts...which is not possible for the device.

So I assume it is firing at the lowest wattage it is capable of (3.6V), so the watts would be 64.8 watts.


So now I have a new question (LOL)....how does a device with a upper power limit of 50 watts and a lower voltage limit of 3.6 V fire a coil down to 0.2ohm, when such coil will require 60 watts of power?

 

[jamal01]

So in order for your IPV2 to fire .2 ohms at 7 watts would require a voltage of 1.183.

Now with all of that, assuming the IPV2 doesn't have step-down and your battery was near completely discharged at 3.3 volts you'd be firing at 54.45 watts or on a fully charged battery at 4.2 volts you'd be hitting 88.2 watts.

Edit: To calculate it just Google Ohms Law or if you have a smrat fone then there are numerous Ohms Lay calculators that you can get then just input 2 parts of the equation to get the result.

LOL, posted mine only to see a new answer that covers mine =P

But how would the device output more then 50 watts if it has a 50 watt limit? Or is that just what the "adjustable" limit is - and when building low resistance coils it is able to provide more power due to the higher minimum voltage?

 

[Frenchfry1942]

It does the best it can. What you want to focus on in the specifications is a DNA40 or a SX350 chip. Those two chips are both new. Also the Provari and MVP models do have the ability. To my knowledge, they are the mainstream ones. There are a probably a couple more.

 

[jamal01]

It does the best it can. What you want to focus on in the specifications is a DNA40 or a SX350 chip. Those two chips are both new. Also the Provari and MVP models do have the ability. To my knowledge, they are the mainstream ones. There are a probably a couple more.

Thanks...I have the ipv2 was so more directly concerned about that device in particular with regards to how it fires 0.2ohm.
It uses the sx330 chip.

Was just confused as to how it can fire a 0.2 when the minimum voltage (3.6) and maximum wattage (50) lead me to calculate that the lowest it should be able to fire is ~0.3

(I know its about 0.26 but the IPV2 displays up to the 10th decimal place so assume it would round this up to 0.3)

 

[Evi|grin]

Yihi SX350 specs
Yihiecigar SX350, Upgradable chip

The Output Volt Buck-Boost&Boost Available

6 Output Power (Bypass mode) 5 Watts (3 ohm) 80.0 Watts (0.2ohm)

SX330 V2
http://www.yihiecigar.com/products_info/YiHiEcigar-SX330-V2-50W-New-Vapor-Chip-270815.html

NADA

 

[MrPlink]

The stated power range of the device has nothing to do with what it will FIRE, but rather what it will REGULATE.

When you use a resistance rating (such as .2) you are obviously outside of the regulation range of the IPV2 and what you are getting is raw battery voltage. In essence you have created a very inefficient mech.

If you want regulation then you need to bump resistance to .3.

IPV does not have step down, but it is a little misleading because it can regulate down to 3.6, but only IF the battery itself has 3.6v or less.
Again, using a wattage that would take you under 3.6 does not mean it won't fire but just that it isn't regulated.

 

[alongo]

Then devices without the step down feature aren't woth their weight in dog doo, correct?

Sent from my VS980 4G using Tapatalk

 

[jamal01]

The stated power range of the device has nothing to do with what it will FIRE, but rather what it will REGULATE.

When you use a resistance rating (such as .2) you are obviously outside of the regulation range of the IPV2 and what you are getting is raw battery voltage. In essence you have created a very inefficient mech.

If you want regulation then you need to bump resistance to .3.

IPV does not have step down, but it is a little misleading because it can regulate down to 3.6, but only IF the battery itself has 3.6v or less.
Again, using a wattage that would take you under 3.6 does not mean it won't fire but just that it isn't regulated.

Thanks, exactly what I was looking for

 

[classwife]

Moved to Variable Voltage APV Discussion from APV Discussion

 

[Flt Simulation]

Then devices without the step down feature aren't woth their weight in dog doo, correct?

Even if your device don't have buck (step down) capability, they still work fine as long as you use a coil with a higher ohm, so as to require the device to output more than what your fully charged battery outputs.

I have a iPV Mini. It also don't have voltage step-down. I like to vape at 11 watts, so I just use a coil that has at least 1.6 ohms of resistance. That combo of ohms and watts requires 4.19 volts. Even a fully charged battery will not put out more than 4.19 volts .... so I am good to go.

 

[Evi|grin]

I have a iPV Mini. It also don't have voltage step-down. I like to vape at 11 watts, so I just use a coil that has at least 1.6 ohms of resistance. That combo of ohms and watts requires 4.19 volts. Even a fully charged battery will not put out more than 4.19 volts .... so I am good to go.

Thats what i did too and im quite happy. On the Nautilus 1.6 and 1.8ohm are just fine with me but for cartos, im going to have to go upto 2.0ohm which is no big deal.

 

[Monotremata]

Then devices without the step down feature aren't woth their weight in dog doo, correct?

Sent from my VS980 4G using Tapatalk

Not necessarily.. If youre only going to be vaping at 7 watts, theres absolutely no reason to build a 0.2 ohm coil to begin with.. The only reason you want the lower resistance coils is to use more wattage to heat it. Its really geared towards attys and drippers with huge airflow/multiple coils. My Kayfun Lites at 1.5 ohms wont take much over 14-15w without getting burnt, but my Magma, with the same resistance coil can take up to 20w, and then some because of the airflow in it. 20w in the KFL literally burns the crap out of my throat, but the Magma doesnt even feel like hot air coming out at that wattage..