LTspice gate nand

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cheniour

Member

• Nov 10, 2020

• #1

hello i'm new in this groups and i need a help
my project topic energy harvesting .so i need to know how i use gate nade bcause it have many branch any person can help me please

 

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opampsmoker

Member

• Nov 11, 2020

• #2

NAND gate....yes you get it in the logic section, then put in your digital thresholds and output high and low voltage.

Labs: LTspice NAND gates: ECE 1050-005 Spring 2019 Matlab for ECE Design

utah.instructure.com

 

alec_t

Well-Known Member

Most Helpful Member

• Nov 11, 2020

• #3

Welcome to ETO!
Note that the native generic NAND gate doesn't behave quite like a real-world one (such as a CD4000 series gate).
Post your project schematic, plus your asc file.

 

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cheniour

Member

• Nov 11, 2020

• #4

you can help me please I want to do the simulation I prepared the all blocks but now I'm going to try to command the semi actif boost rectifier by the two pwm signal but the output voltage reach at 450 mv so I need 1.5 volt I don t know what is the problem
also tomorrow I will do a meeting but anything worked correctly

 

Attachments

• pdf energy.pdf

  1.8 MB · Views: 375
• project.asc

  7.3 KB · Views: 322

alec_t

Well-Known Member

Most Helpful Member

• Nov 11, 2020

• #5

Edit the inverter and both NAND gates so that Vhigh = 1.5V.
Set the sim run time to 0.1, with all other parameters blank.

 

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cheniour

Member

• Nov 11, 2020

• #6

there is a fault in my inverter ?

 

alec_t

Well-Known Member

Most Helpful Member

• Nov 11, 2020

• #7

Your inverter has Vhigh = 15V. That would put its low/high threshold at 7.5V, which the input could never reach.

 

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eTech

Well-Known Member

• Nov 11, 2020

• #8

I made a just a few changes to get it to run. You'll have to troubleshoot.
See attached.

 

Attachments

• project.asc

  7.4 KB · Views: 291

C

cheniour

Member

• Nov 11, 2020

• #9

thank you very much
why did you added resistance interne 100m and what's mean il(1) =0?

 

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eTech

Well-Known Member

• Nov 11, 2020

• #10

cheniour said:

thank you very much
why did you added resistance interne 100m and what's mean il(1) =0?

Click to expand...

All voltage sources have some resistance. i(L1)=0 tells spice to initialize L1 inductor to 0 current at start of simulation.
Both help convergence.