Is there a similar option like (start external DC power supply voltages at 0V) similar to LT SPICE?
You can use uic option in transient simulation.
Like this: .tran 10m uic
Best regards
Thanks for the fast solution.
Best regards,
Beware that UIC option skips the DC operating point calculation, causing you to start your simulation from an incorrect DC operating point. In LTspice, UIC is the option ‘Skip initial operating point solution’ in the Configure Analysis settings.
https://ltwiki.org/files/LTspiceHelp.chm/html/UIC.htm
What you are referring to in LTspice is the option ‘Start external DC supply voltages at 0V,’ and you may expect to see this syntax: .tran .. startup
.
https://ltwiki.org/LTspiceHelp/LTspiceHelp/startup.htm
The .tran Startup
is not available in Qspice. However, you can replace your source—such as a 24V DC source—with a PWL source that starts at 0V, for example: PWL 0 0 20u 24
. This approach ensures that you do not skip the DC operating point calculation but that the source starts at 0V.
(I ran a test in LTspice, only DC source with ramp added for Startup option, not PULSE, SINE, PWL etc…)
Thanks. Before PWL and UIC, I tried the PULSE option instead of using a DC power source.