Recent content by rz

Hi all. Fortunately I'm still alive, and so is my prototype :) Unfortunately, I lost my dad almost a year ago. He passed due to liver failure after a long decline. I took over many of his responsibilities towards both my immediate and extended family which, along with increasing...

Did somebody say parasitic oscillation? Add some pushbutton switching noise to the mix while at it..

Sorry guys I'm way overdue for an update. Not at home now so no screens hots etc. . I've had a lot of other things I've had to focus on recently, but always making progress (surely but slowly) with this proj. I redid the mosfet layout to improve thermal characteristics. I got a new oscilloscope...

@io_wait let me know when you find a good chip :) the BMS under/over voltage is "per-cell", so the charge cutoff will be when ANY cell hits the value... dunno what chip model it is (usually there are tens of varations of each model actually), but usually around 2.5V/4.2V. You could find chips...

@io_wait welcome to FC! :) Glad you're getting in on the DIY action. Li-po cells need to be handled with a little extra care. There's a region of safety where the cell can comfortably accept charge, and out of that 'zone', the cell will deteriorate much faster (/ too fast?). LiPo's are...

@nachooo the circuit does work with 2S, however like @Pipes mentioned I use a boost converter to increase gate drive voltage to a predictable ~12V, even while pack voltage drops to about 5V where the BMS cuts it out. I found some MOSFETS that only needed about 6V to start oscillating, and most...

@zky42 Welcome! Congrats on the IH build. looking nice and snug in there. Please be super careful to avoid any short circuits as these batteries can pack a serious punch. If that is copper foil, it looks pretty close to some critical areas that may not even be protected by your BMS!. Look into...

@Copacetic rZToaster is still in the works! :) Though indeed, the little addition to the fam has required some extra attention, along with a lot of other things keeping me busy.. other kids.. aging parents.. work.. me.. I've had to do some stress management to stay sane, so development has...

@phattpiggie IH surfing - best way to F@#k the click! :rockon: Srsly, once you get the hang of it, it's super quick and efficient. I can complete a cap before my buddies even finish grinding their shiznit.

@FryMeALiver See my revised answer. You should rather pick a 3S cell pack, and @KeroZen has some good suggestions as to which. Either of the two protection boards you linked to above should do. If you have the space, take the one with cell balancing as this will have a good return on investment...

@FryMeALiver The first battery pack would probably be capable, though it's hard to tell if it will work or not (by design). Firstly, the battery is rather large, has the stated capacity to run an IH for many many sessions, and is lithium ion, so is probably capable of delivering the sporadic ~7A...

These? With batteries, capacitor, induction coil + PCB.. the smaller ones are too tight inside, bigger ones.. too big?(but would work). something exactly between 1455C801 and 1455K1201 would be perfect but the ones inbetween don't work specially with that internal screw mounting rail. 100x60x30...

@zhong so thats about 7.5A @ 24Vdc? ~180Watts. Assuming 90% efficiency in the step down that's still over 150W delivered to the IH. Those transistors must be getting toasty. You could try reduce capacitance. 0.33~0.66uF range should be good depending on your coil. I'd experiment a little there...

@tuuwie http://fuckcombustion.com/threads/vapcap-induction-heater-for-desktop-and-in-car-use.23211/page-75#post-1220762 http://kaizerpowerelectronics.dk/high-voltage/mazilli-zvs-flyback-driver/ in general, google Royer oscillator / Mazilli flyback driver. @zhong8051 looking good. Keep up...

@tuuwie Look for: N-channel MOSFET Low Rds ( < 20mOhm?) Vds breakdown 40v at least (Lower values *may* work, 60v is even safer) Vgs threshold should be low, below 4v. Low gate capacitance. Look for keywords in the feature description like: High-speed switching Small gate charge Low drain-source...