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I have the following circuit and I want to varry V1 from 24V to 0v while keeping V2 = 5V, naturally I tried using DC sweep simulation with start value of 24V, end value of 0V and variation of -1, but that gave a variation from 0V to 24V, I've tried changing the variation to 1, that gave the same results.

So my question is : how can I make DC sweep simulation with negative variation? I am using pspice with orcad 16.4

enter image description here

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  • \$\begingroup\$ How can you tell which order the sweep was done? If you're just looking at a graph, of course 0 V is still on the left of the x-axis and 24 V is on the right, even if the sweep was done the other way. \$\endgroup\$
    – The Photon
    Commented May 21, 2017 at 19:14
  • \$\begingroup\$ @ThePhoton I deduced from the current curve, since I'm using a thyristor it should switch to off once the current goes below the holding current (At 24v it's already turned on) \$\endgroup\$
    – Ernest Dujo
    Commented May 25, 2017 at 11:14

2 Answers 2

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This might not be OP's exact requirement, however, it will work just as fine: instead of a DC sweep use a TRAN analysis, with V1 set as a decreasing ramp, e.g. PWL 0 24 1 0. PULSE() will work, too. Then simply replace time with another quantity after the simulation has run, e.g. I(V2).

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Try varying voltage V1 in Eg: -10 to 24 with the increment of 1. Since there is a increment it should always be increasing. This will increment form -10 in step of 1 till 24. Simulation Settings

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  • \$\begingroup\$ OP wants decreasing, not increasing. The increment must be negative, and then the simulator needs to correctly interpret that and allow a decreasing sweep. \$\endgroup\$
    – a concerned citizen
    Commented May 26, 2020 at 10:43
  • \$\begingroup\$ Thanks for correcting me. I will delete the answer since it misguides/ makes no sense. \$\endgroup\$
    – Pai
    Commented May 26, 2020 at 17:45
  • \$\begingroup\$ First try to see if it actually works with negative increment. If it does, then it's an answer like any others. \$\endgroup\$
    – a concerned citizen
    Commented May 26, 2020 at 18:03

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