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LTSpice .meas Help

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Glenn0010:
Hi all,

I am not very used to spice directives and would like some wisdom.

I have the circuit below where I am to measure the different fall time of an IGBT under different load currents. I have done .meas scripts however this only does the measurement for the first fall time. I would like this to be repeated for all the rest of them. other than copy pasting it several times, is there a more elegant way of doing this?



Cheers

SiliconWizard:
Off the top of my head, I would try something like this:
- Make V1 only generate ONE pulse.
- Use a parameter for the load current.
- Use a .STEP directive to make above parameter sweep through the intended range.
- Keep your .MEAS directives as is.

But some questions: how do you modulate the load current here? Is something important hidden by the Cursors Window?

Glenn0010:

--- Quote from: SiliconWizard on August 18, 2019, 03:33:51 pm ---Off the top of my head, I would try something like this:
- Make V1 only generate ONE pulse.
- Use a parameter for the load current.
- Use a .STEP directive to make above parameter sweep through the intended range.
- Keep your .MEAS directives as is.

But some questions: how do you modulate the load current here? Is something important hidden by the Cursors Window?

--- End quote ---

The load current is dictated by then inductor size. The value of the inductor dictates the rise time, if this simulation were longer the inductor current would keep on rising.

Using the step command can I "set" the current through the inductor? Say setting an initial condition

SiliconWizard:
Ok, makes sense now. But sorry to be thick, where is the power supply? Is it not hidden on the right?

Glenn0010:
Oh yes it is, it is a 800v dc supply

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