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Frequency Response Analyzer with Bode Plots

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Re: Frequency Response Analyzer with Bode Plots

Postby Rolandvanroy » Sat Feb 10, 2018 8:36 am

Hi,

I have uploaded a PDF file to my website which shows details on how I did several gain-phase measurements using the PicoScope FRA utility on a buck converter prototype . You can download the file via below link:

http://www.simprojects.nl/images/Gain_P ... ements.pdf

I will post more info on how to make the signal injection transformer when I receive the common-mode choke I ordered for this purpose.

Roland
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Re: Frequency Response Analyzer with Bode Plots

Postby Rolandvanroy » Thu Feb 15, 2018 7:42 am

Hi,

You can find a tutorial on how to make a signal injection transformer for testing DC/DC converter gain-phase with the FRA utility via the below link.

http://www.simprojects.nl/images/DIY_si ... former.pdf

The tutorial describes the basic transformer requirements and the materials you need for making your own transformer. I used the core from a Coilcraft CMT4 series common mode choke. (I ordered it via their free sample service), but Mouser also carries some of these types. I used the PicoScope FRA to verify the simulation results with actual measured results, which match quite closely :D
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