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 VPULSE Frequency Change in Transient 

Last post Thu, Oct 17 2013 8:58 AM by ArshamA. 2 replies.
Started by ArshamA 17 Oct 2013 06:32 AM. Topic has 2 replies and 3977 views
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  • Thu, Oct 17 2013 6:32 AM

    • ArshamA
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    • Joined on Thu, Oct 17 2013
    • Dieppe, New Brunswick
    • Posts 2
    • Points 25
    VPULSE Frequency Change in Transient Reply
    Hi,

    Could anyone suggest a method that allows to change the frequency of VPULSE voltage source during a transient simulation? (e.g. Change the PER and PW to a certain value at 160uS and then to another value at 220uS.)

    I've attached the picture of the circuit in my interest.

    I would appreciate any help.

    Arsham

    • Post Points: 20
  • Thu, Oct 17 2013 7:01 AM

    • oldmouldy
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Woking, Surrey
    • Posts 1,444
    • Points 24,585
    Re: VPULSE Frequency Change in Transient Reply
    Use a VPWL for a limited number of transition points, or VPWL_FILE to source the transition points from a file (practically unlimited)
    • Post Points: 20
  • Thu, Oct 17 2013 8:58 AM

    • ArshamA
    • Not Ranked
    • Joined on Thu, Oct 17 2013
    • Dieppe, New Brunswick
    • Posts 2
    • Points 25
    Re: VPULSE Frequency Change in Transient Reply

    Thanks for the suggestion. It seems VPWL_FILE is the way to go, but it is next to impossible to have the high and low side synchronised so they don't short out the two MOSFETs. Do you know what I mean?

    I wish I could think of a single voltage source solution to achieve this. I need to go from 45kHz to 85kHz while measuring the current through the S-pin of the lower side MOSFET using a current sensing resistor.

    The 100GOhms resistor is going to be replaced with a tuned circuit, that's why this configuration is important. 

    Any ideas?

     

    • Post Points: 5
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Started by ArshamA at 17 Oct 2013 06:32 AM. Topic has 2 replies.