Just been having a play around on my sig 30w mini between dc-dc and pwm modes, noticed that in pwm at 22.5w with a 1ohm coil its at 4.7v yet flick it over to dc-dc and it runs at 4.9v anyone able to explain why?
Voltage difference between dc-dc and pwm?
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I've never used a sig 30w mini, but from my Electrical Engineering knowledge I can explain a little about these modes. The PWM mode is used as a regulated power mode, and the DC-DC is used for mechanical mod mode. I don't have much knowledge/experience with these in terms of vaping, but from what I can understand the DC-DC is simply a 'static' voltage, meaning it wont change, which is assuming why you're getting 4.9v, but with the PWM, you can alter the voltage, so it is 'dynamic' (Because PWM is pulse width modulation, bigger gaps in the pulses meaning lower voltage etc)
Edit: I did a quick bit of research and I found this:
Mechanical mode bypasses the chip-set and allows to sub-ohm lower than the chip allows
I also found this thread on reddit which has a big post regarding the different modes
REVIEW OF THE SIGELEI MINI 30W!!! : electronic_cigarette
Edit: I did a quick bit of research and I found this:
Mechanical mode bypasses the chip-set and allows to sub-ohm lower than the chip allows
I also found this thread on reddit which has a big post regarding the different modes
REVIEW OF THE SIGELEI MINI 30W!!! : electronic_cigarette
In certain resistances the pwm is more accurate and in others the dc-dc mode is. Unless you want to test it with an inline volt meter, just pick one, lol! They were both close in most cases in PBusardo's tests. Watch his review. I haven't even looked to see which one mine is set in.
Nope. DC-DC does NOT bypass the chipset and doesnt have anything to do with how low of a resistance you can run it at. If it bypassed the chipset you wouldnt be able to still adjust your wattage in DC-DC mode. Its all over the Sig Mini threads here and it even says how it works right there in that review, although hes wrong that you can set it to 5w and run it in DC-DC mode. DC-DC wont go below the batteries actual voltage. Anytime youre wattage is set to run below the actual voltage of the battery the device automatically switches to PWM. Thats how it bucks and steps down.
Volts would be the same, speed at which it is adjusted during the run cycle is what changes. The difference between them in basic terms is the two methods use different math formulas to reach the same result.
Also only HIGH dollar Volt Meters can even read the cycle wether Dc-dc or PMW, as the levels change too fast.
Also only HIGH dollar Volt Meters can even read the cycle wether Dc-dc or PMW, as the levels change too fast.
This is true. You need an oscilloscope to read the pwm. Well, watch his review and it may help you choose based on the power you're running.
The correct voltage for your application is 4.74341649. However a chip set capable of delivering that accurately to the eighth decimal would probably cost an arm & a leg. Isn't it nice that vaping doesn't require that kind of accuracy. Just set your voltage to the flavor you like best & forget about the meter maybe reading 0.2 more than it should read.
As stated before DC-DC mode gives a static voltage that way you get a constant reading, PWM only changes the duty cycle and while firing at full battery charge giving you an avg voltage. With PWM you could be firing a bit higher in avg or lower, depending on how the device is programmed and also the hardware on the board.
However his inaccurate reading is in DC-DC mode, not PWM. To me that would simply indicate that his PV doesn't have a million dollar volt meter installed in it.
The only way to tell for sure is to hook the PV up to an o-scope and compare the actual readings to the indicated readings.
Right now my PV is set at 4.something or another, but it tastes the way I want so I really don't care what the decimal reading is.
The only way to tell for sure is to hook the PV up to an o-scope and compare the actual readings to the indicated readings.
Right now my PV is set at 4.something or another, but it tastes the way I want so I really don't care what the decimal reading is.
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using pwm your getting some inductive reactance slightly increasing and or decreasing your base resistance.
regards
mike
Don't shoot the messenger! I found that bit online from one of the retailers
Know what you say.
Say what you Know.
The internet is Slam Full of incorrect information.
*Note: the functions are Mod Dependent.
Some have no Buck circuitry.
Some only use PWM if selected.
Some will auto switch if set properly.
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