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Strange behavior in Pspice simulation of an ALC circuitry

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windman

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pspice behavior

Hi everybody,

I encounted a strange phenomena when I did simulation of an ALC(automatic level control) loop using Orcad/pspice 9.1 simulator. Roughly saying, the transient simulation results are dramatically different with different settings of simulator, they are quite different even just changes the endtime of simulation while keep others no change.

For the details behavior pls check the attachment.

Any comments or suggestions are welcome.

Thanks for your attention.
 

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