Blog 3 - Magic Lightbox: Understanding Flyback Converters.

RE: Blog 3 - Magic Lightbox: Understanding Flyback Converters.

taylan41 — Tue, 16 Jan 2024 13:56:05 GMT

amazing work! Have you tested constant voltage constant current control?

RE: Blog 3 - Magic Lightbox: Understanding Flyback Converters.

shabaz — Wed, 10 Jan 2024 00:02:12 GMT

Great work. Starting from experiments like this, one can learn a lot from your writing and photos, because you are doing all the steps anyone would do if they had "what if" questions, and I believe it leads to great understanding for people who try to follow it, at least it does for me.

Regarding the scenario of MOSFET on with no input, it's worth adding say a 10k pull-down (or pull-up, depending on need) always on the input circuitry, just in case of that. Also worth applying a high value resistance (e.g. 100k or even 1M) on the gate-source connections of MOSFETs, just in case someone unsolders some parts, which could leave the gate floating. Maybe I'm paranoid, but on a PCB I solder that resistor first, and then the MOSFET. For breadboard, I solder the resistor directly to the MOSFET, i.e. make it into a MOSFET+resistor "module".

For the 600V supply project, I too want to connect an external PWM source. Just to compare notes, hehe: I went with a MCP1402 chip (there is also MCP1401 chip), I've not tried it out yet though. I liked these because they are large SOT23-5, so are easy to experiment with, reasonably low-cost, and can be used as a 3.3V logic-compatible high-power buffer (MCP1402) or inverter (MCP1401). This loses out on self-learning experiences, so I can understand why you wish to use discrete gate drive, that's very valid approach. I also considered the FAN3100T, it's much better, it can be configured to be inverting or non-inverting, but costs a little bit more. Annoyingly not pin-compatible with MCP140x : (

The portable oscilloscope has a great multimeter display - that's really awesome : )

RE: Blog 3 - Magic Lightbox: Understanding Flyback Converters.

DAB — Tue, 09 Jan 2024 20:30:28 GMT

Very good update and experiments.

Well done.

RE: Blog 3 - Magic Lightbox: Understanding Flyback Converters.

scottiebabe — Mon, 08 Jan 2024 12:54:42 GMT

Wonderful experimenting and excellent presentation of your adventure. I think you may have a dead 9V battery though.

RE: Blog 3 - Magic Lightbox: Understanding Flyback Converters.

shabaz — Mon, 08 Jan 2024 02:06:44 GMT

Looks like you've been busy : ) Looking forward to reading this blog in detail tomorrow, because of all the interesting experiments. Also, I think it will be easy to follow along, in part because of all of the clear annotated photos and circuit diagrams and screenshots, this is definitely appreciated.