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Experimenting with Magnetic Components
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Experimenting with Magnetic Components
Blog Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations
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Engagement
Author: Jan Cumps
Date Created: 2 Oct 2021 11:23 AM
Views: 507
Likes: 0
Comments: 9
  • experimenting_with_magnetic_components
  • magnetic_components
  • bourns
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Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

Jan Cumps
Jan Cumps
2 Oct 2021

I'm reviewing a set of inductors for the Experimenting with Magnetic Components design challenge.

Because it's a design challenge, I'd like to start with a working product. A switch mode DC converter.

It's one of the standard circuits: the boost converter. A design that increases a DC voltage.

 

Goals:

  • 9 - 12 V DC input
  • 30 - 60 V DC output
  • up to 20 mA output current
  • max 200 mV ripple
  • common components
  • no regulation or feedback

 

But first:

 

Post 1#: Introduce yourself and explain what experiments you plan to perform

I live in Schaerbeek, Belgium and have studied electronics, measurement & control techniques, and information systems.

My theme is "grow the love for inductors as LAB project building block".

  • What they do
  • Where you use them,
  • Review the inductors in the kit
  • How to measure, without LCR meter
  • How to use an LCR meter
  • How to roll your own coil, your own little transformer
  • PCB transfo

 

Back to the story:

 

The inductor: Bourns RLB Series 1mH Radial Lead InductorBourns RLB Series 1mH Radial Lead Inductor

 

image: Bourns RLB0914-102KLRLB0914-102KL 1MH inductor with candidate MOSFETs

 

The datasheet is available on element14. All info is taken from that document.

image: the specifications of the 1mH inductor

 

Measurements on the component in my kit:

The datasheet did the measurements at 252 KHz. I'm doing them at the maximum setting of my meter: 100 KHz.

The meter (comparable with GW INSTEK LCR-916) was calibrated before the measurements.

Results (f = 100 KHz)

 

L:955.5µH

Q:  106.5

D: 0.009 (1/Q)

ϕ: 89.4°

ESR: 5.64 Ω

 

The Boost Converter Calculations

 

I'm using the most common boost converter design. Adafruit (and others) posted a calculator online.

I used that, and changed parameters until the design matched the 1 mH inductor.

 

image source: calculation done with the Adafruit boost converter calculator.

 

Whe in I use a switching frequency of 72000 Hz, the calculator suggests exactly 1 mH.

Texas Instruments has an application note on the calculations.

Coursera has an excellent Power Electronics course, from U of Colorado Boulder.

 

Hang on while I'm starting the build.

 

 

Related posts
1. Boost Converter part 1: Inductor and Calculations
2. Boost Converter part 2: Build
3. Boost Converter part 3: Measure the Inductor in action
4. LCR meter experiments
5. SMD transformers experiment gizmo part 1: Build
6. SMD transformers experiment gizmo part 2: Measure
7. Common Mode Choke
8. Make your own Inductor
9. Calculate your own Inductor
10. Boost Converter part 4: Efficiency
11. DIY Inductance Meter
Planar PCB Transformer: GaN Point of Load converter 48V to 1V 50A
Measure Unknown Inductor Value with Function Generator and Oscilloscope
Experimenting with Magnetic Components: About the Competition
Anonymous
  • Jan Cumps
    Jan Cumps 7 months ago

    I ordered a set of easy-to-drive N-Channel MOSFETS to test the 2 pulse transformers of the kit. N-Channel On Semiconductor NTK3134N (Farnell 27244122724412)

    I should be able to control the FETs from this FPGA design (with an extra driver to up the gate to 6 V from 3.3 V): FPGA based PWM generator with scroll wheel control.

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  • Jan Cumps
    Jan Cumps 7 months ago

    Some measurements of one coil of inductor #10 with LCR (100 kHz): Common Mode choke 9 µHCommon Mode choke 9 µH

     

     

    Inductance:

    Phase angle (θ):

    Dissipation factor (1/Q)

    Quality factor (tanθ, 1/D)

    Equivalence serial resistance:

     

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  • Jan Cumps
    Jan Cumps 7 months ago

     

    80% duty cycle. Not all components are equal to the calculation, because I didn't have them.

    9 V -> 32 V

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  • Jan Cumps
    Jan Cumps 7 months ago in reply to shabaz

    fixed

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  • shabaz
    shabaz 7 months ago in reply to Jan Cumps

    Hi jan,

    Nice prototyping!

    Btw there's a typo, you mean 72000 Hz but have written 72000 kHz.

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