All Questions
62
questions
0
votes
2
answers
112
views
Simulation of high side N-channel MOSFET with Bootstrap in LTspice
The inverter circuit I made from N-channel MOSFETs is given below. I used bootstrap for the high sides. Bootstrap capacitors are C3 and C1.
The gate voltage of the MOSFET is working properly, the ...
- 405
0
votes
2
answers
214
views
Issue with LED and capacitor circuit
I have recently downloaded and am familiarising myself with LTspice, and to do so I started with a basic circuit.
I had never used a scope prior to this and thought a capacitor discharging to an LED ...
- 9
3
votes
1
answer
84
views
How do I configure a negative clamper in LTspice?
I am trying to make a negative clamper in LTspice. The pulse source goes from 10V to -10V harmonically. My aim is to lower it's voltage by 7.3V, so it will have a pulse graph going from 2.7 to -17.3V, ...
- 43
2
votes
3
answers
1k
views
The output of my rectifier which should be charging a capacitor on LTSpice is extremely jumpy and inconsistent
For some reason, every time that I include a capacitor in this circuit LTSpice transient analysis is very jumpy.
Is there a better way to use the output of a bridge rectifier for this purpose?
I tried ...
- 195
1
vote
0
answers
123
views
How to model a hand crank generator in LTSPICE?
I built the following circuit that uses a small BLDC motor (3-24V AC) to generate enough energy to light an LED for roughly 40 seconds once C1 is charged to 5V and the generator stops.
It takes about ...
- 217
1
vote
3
answers
1k
views
Why can't I charge a capacitor using a N-FET as switch
I'm new to MOSFETs and LTspice, but I have an N-MOSFET working as I would expect with resistive loads, I’ve had step like input on the gate too and all seems good, but whenever I put a capacitor in ...
- 667
0
votes
4
answers
133
views
Can’t Get 555 Timer Capacitor to Ever Discharge or Charge to Expected 2/3 Vcc Value
I am trying to set up a circuit in which an NE555 timer's duty rate and frequency
output is illustrated by it's output being connected an NPN transistor. When the out-
put is high, LED1 will ...
0
votes
0
answers
251
views
How can I simulate a super capacitor in LTspice?
I am trying to simulate a super capacitor in LTspice but it is not giving me the correct discharge time as it should be theoretically.
Has anyone also faced this issue? Please let me know how to ...
0
votes
1
answer
122
views
If a capacitor value is given as an equation, how can it be written in LTspice?
For example: If a capacitance equals q·v·Ne·evj, can I insert a simple capacitor and put its value as Q= (q·v·Ne·exp(vj))·x, where x is the predefined variable which means voltage across the capacitor?...
- 47
0
votes
0
answers
102
views
Loading problem with circuit simulation
EDIT #1
So I understand now the phenomenon that is happening.
Taking operational stage 2 Switch is OFF.
So there are the 2 cases discussed.
RL = ∞ (exaggerated scenario) the current I1 >> I2 ...
- 536
0
votes
1
answer
108
views
Fourth-order passive filter not behaving as intended
I have been designing a passive 4th-order RC low-pass filter in LTspice and was surprised to see that the slope is off substantially from what I would expect for a 4th-order passive filter. Instead of ...
0
votes
0
answers
50
views
What is the difference between adding capacitor in 2 different ways to create the delay?
I’m finding similar delay results for both the circuits shown below.
Draft 1: Capacitor C3 and C1 are connected to separate branches, though both of them together determine effective delay.
Draft 2: ...
- 3,032
0
votes
1
answer
105
views
Ltspice easy DC LC circuit
I'm making this simulation of an LC circuit with DC. After simulating it with different simulators, it seems that LTspice is doing something wrong. Also, if you mess with the simulation time, it ...
- 77
4
votes
2
answers
231
views
Strange behavior when simulating a five-level flying capacitor inverter in LTspice
I'm studying the multilevel flying capacitor inverter topologies. I simulated a five-level model on Simulink and the results are OK, but when doing the simulation in LTspice with MOSFET models (IRF830)...
- 41
0
votes
2
answers
155
views
Measuring variable capacitance [duplicate]
I am required to design a circuit to measure C using the parallel plate capacitance formula. The circuit should be able to detect a change in the separation d of 5 × 10−4 mm.
I have done the following ...
