Q-factor of home made inductors - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 13th March 2012, 10:05 AM   #1
diyAudio Member
Join Date: May 2011
Location: Santa Lucija
Default Q-factor of home made inductors

I am currently designing an LRC meter that is based on the principle of measuring the frequency of a precision tank circuit with your DUT connected in parallel and then calculating the DUT by knowing the difference in frequency.

Very Accurate LC Meter based on PIC16F628A

My frequency measurement although is based on the Microchip CTMU where I can measure time period in resolution of 1ns and even less I use an external adc(higher bits).

My question is about measuring the Q-factor of small inductors at least. This is because my meter will be aimed for modern switch mode power supply design. I read that today, frequencies had increased to 100khz-120Khz. By using the best core material and good winding wire, would the q-factor be so significant? (I assume yes since the incductor would be small in value).

Another thing: Would hysteresis alter the Q-factor(Dc resistance) significantly at those frequencies and for such an application?

Would I be able to measure the Q-factor by taking advantage of the damped harmonic oscillation phenomena and measure the frequency of my tank circuit(with DUT attached) at different periods while the oscillation is being damped slowly. That way I can account for the hysteresis since the static tank circuit could be set to oscillate at the frequency range (100khz-120khz).

I would really appreciate any hints, thanks
  Reply With Quote
Old 14th March 2012, 06:09 PM   #2
RJM1 is offline RJM1  United States
diyAudio Member
Join Date: Jan 2010
Location: Titusville, Fl.
You might want to increase that frequency some.
3.5 MHZ converter.
DC/DC Converter (Integrated Switch) - Step-Up Regulator - TPS61256 - TI.com
  Reply With Quote
Old 14th March 2012, 06:38 PM   #3
diyAudio Member
Join Date: May 2011
Location: Santa Lucija
thanks for your reply. What is the best method to measure the peak voltage at the inductor at those frequencies? I will be using 32Mhz PIC24F with 500ksps adc.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Power Factor Corrector Inductors Mostech Power Supplies 0 8th February 2011 07:58 AM
Air Core Inductors, Custom Made uzernaam Swap Meet 4 28th December 2010 10:47 AM
Home wound inductors. Big_Bill Multi-Way 10 29th July 2009 09:16 PM
Home Made Tubes?? has anyone made one, is it possible?? John Biles Tubes / Valves 7 11th December 2005 01:29 AM
Inductors made for crossover in an amp? hacknet Tubes / Valves 13 16th September 2004 04:01 PM

New To Site? Need Help?

All times are GMT. The time now is 03:24 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2