Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

RE: Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

Jan Cumps — Sun, 10 Oct 2021 10:07:37 GMT

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.

RE: Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

Jan Cumps — Fri, 08 Oct 2021 15:25:17 GMT

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

[View:/resized-image/__size/492x369/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/3554.contentimage_5F00_216613.png:492:369][View:/resized-image/__size/337x367/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/0815.contentimage_5F00_216614.png:337:367]

Inductance:

[View:/resized-image/__size/422x60/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/3652.contentimage_5F00_216615.png:422:60]

Phase angle (θ):

[View:/resized-image/__size/424x56/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/7652.contentimage_5F00_216616.png:424:56]

Dissipation factor (1/Q)

[View:/resized-image/__size/415x56/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/1884.contentimage_5F00_216617.png:415:56]

Quality factor (tanθ, 1/D)

[View:/resized-image/__size/412x56/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/1300.contentimage_5F00_216618.png:412:56]

Equivalence serial resistance:

[View:/resized-image/__size/420x56/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/4532.contentimage_5F00_216619.png:420:56]

[View:/resized-image/__size/620x102/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/0312.contentimage_5F00_216620.png:620:102]

RE: Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

Jan Cumps — Sun, 03 Oct 2021 15:18:08 GMT

[View:/resized-image/__size/620x708/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/4274.contentimage_5F00_216568.png:620:708]

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

9 V -> 32 V

RE: Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

Jan Cumps — Sat, 02 Oct 2021 17:38:25 GMT

My function generator should be up to the job.

It can generate a square wave that's 22 V p/p. I can use it isolated and concider the -11 V as ground level.

If I use its offset mechanism to make it ground-referenced, I can get a 13.5 V square wave:

[View:/resized-image/__size/620x372/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/0841.contentimage_5F00_216558.png:620:372]

I don't worry about the negative shoot-through in offset mode, should not harm the gate.

But most likely I'll use it in isolated mode.

In any case. 8 V and more should do it in my scenario:

[View:/resized-image/__size/406x320/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7c627c5b-4e6e-49d3-94f0-807932388312/3173.contentimage_5F00_216559.png:406:320]

source: Sanyo 2SK2632LS datasheet

RE: Experimenting with Magnetic Components - Boost Converter part 1: Inductor and Calculations

navadeepganeshu — Sat, 02 Oct 2021 14:30:29 GMT

Interesting! Going bit by bit with discretes is cool