E-Cig Arduino Controller

154

01:36:45

The op amp give the rms voltage value on the resistor.
Vr = 3.86 V
Vpeak= Vr / PWM = 7.72 V
Ipeak = Vpeak / R = 15.4 A
Ppeak on resistor = R * Ipeak^2  = 118.58 W
Prms on resistor = Ppeak * PWM = 59.29 W
Irms = Ipeak * PWM = 7.72 A
Total Power = Vbatt * Irms = 64.85 W
Pmosfet = Ptot - Prms = 5.56 W
Rds₍ₒₙ₎ = (Vbatt - Vpeak) / Ipeak = 0.044 ohm

Monitoring the battery voltage , and resistor voltage, you can simply change the pwm signal to change the power.

published 9 years ago

2ctiby

9 years ago

Each time your mosfet opens it basically connects the + to the - of the left supply, ie a short circuit showing 15A flowing through there.

bryanthehacker

9 years ago

The PWM is the Ton/Toff .For example with a PWM of 0.8 you have high signal for the 80% of the period, and 20% low signal. Very esay

bryanthehacker

9 years ago

Remeber that the mosfet isn't a perfect switch. You have power loss.

bryanthehacker

9 years ago

Mystake

2ctiby

9 years ago

Not to worry...it's basically sound...just strangely described. It's easier just to look at the shown EC values: Vacross mosfet= 0.688, Current I through mosfet=15.4 so When R=V/I then Rmosfet=0.044 Ω (ie Rds₍ₒₙ₎)

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