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Hello! I'm pretty new to electronics and circuit simulations. Trying to implement a basic charge pump using tutorials in internet. But it simply doesn't work. I tried to use circuits from multiple tutorials, tried to think myself, eventually I'm simply not sure whether I'm doing something wrong or it's a simulation issue. |
October 11, 2023 |
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Not sure what your goal is. Try a simulation on time domain, start 0, end 0.5m, step 0.1u, output pwmout and loadup. Seems fine. |
October 11, 2023 |
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I expect to have 20v in loadup and i see 50mV |
October 18, 2023 |
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R5 is way too small. $${20 V / 2 \Omega}$$ implies 10 A. 10A times 20 V implies 200 Watt ! Your 4V battery would have to supply not less than those 200 W, or ... not less than 50 A ! (For conservation of energy, at 4 Volt.) Change R5 from 2 to 200K and you will see the pump in action. |
October 18, 2023 |
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Interesting. Now I see. But in real life the circuit it's gonna be connected to a bank of 18650 batteries which actually can supply 120A current together. |
October 18, 2023 |
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Note that with 120 A, even an internal resistance of 10 milli ohm (which is not even reached at a so low value with most MOSFET), that pumps OUT of the system 1.2 volt. If 10 milli ohm is the internal resistance of the battery (including connection), passing through 4 of them, in series, that is 5 Volt lost, just there. |
October 19, 2023 |
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