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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Sig, if you've got $22, I HIGHLY recommend getting this
It's an extremely useful tool I use again and again, lets you measure inductors, caps, transistors, MOSFET's, diodes, LED's, whatever, and gives you pretty detailed information about whatever it is.
I'm happy to report that I got the boost converter working by selecting another inductor and changing the pulse width (in the code). A huge part of the breakthrough was getting my first real current probe in the mail. Suddenly I was able to see the undistorted current waveform into the circuit, which made it clear when it was running properly and when it was not.
I was able to achieve ~90% efficiency at 24V out into a 100Ohm load.
In getting it actually working with good efficiency I see now that being able to control the pulse width as a means of regulation is a must, and the overall scheme I was intending on using; where the oscillator is switched on and off to regulate is flawed and ineffective. So there's no point in pursuing this uC based design as there are SMPS chips that can do it a lot easier with automatic PWM regulation.
Gate and input Current waveforms, input power, and output power (left to right)
So, does anyone know what was going on with the BJT wackiness in my current amplifier stage?
Also, most of the SMPS ICs I see are good to only about 60V output, is there no monolithic means of achieving higher voltages? Perhaps I'm just searching the wrong things. I like chips with as few of pins as possible, haha, <3 5pin TO-220's. I do work with 8DIP, 14DIP, and 16DIP chips but they are pain sometimes with overly complex circuitry.
Lastly, thank you all for your help in this thread!
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DIY Boost Converter: help me understand my failures please.
