Hey are you using a variable inductor on yours? Also have you tried using the phase lead shit on a half bridge. I cant get one of my boards to work on a half bridge. Never had a problem before.
@Tab54o In this video i used an air core inductor and a pot, but it always seemed to work best with the pot set at its lowest resistance, so now i use a carbon film resistor and a rewound variable inductor. I got the inductor from some old TV board (the kind with the threaded ferrite tuning slug in the metal can) and rewound it with around 22 turns of 32 gauge and it works fine. Now i have it set at a higher res freq and the waveform is around the same, and it ran 620 amps seemingly fine.
@Tab54o Oh i forgot to mention i am using a halfbridge in this video. Without the phase lead shit, i killed a few IGBT bricks, and i haven't killed another one since using it. Finn Hammer is who i got the idea from, and Steve Ward used phase lead for his new driver board.
@triggerhappy77707 Well I use phase lead too in my own driver design but only on one coil and the other day i built another board and could not get it working on a half bridge ended up switching it out for a regular driver. It must be that particular board my first one works fine.
@Tab54o I figured out my problem. My first board had an on board interrupter, the second didnt, the off board interrupter i had the voltage clipped to 5v with two diodes. It was casing the voltage on the phase comparator to ramp up and down and was fckign with the quality of the output signal lol. Now I just need to find a proper inductor.
@Tab54o The frequency in this video was about 44KHz, and i will be running about 64KHz, and this is a 4th (i think, don't quote me on this) generation cm300, so plenty fast enough. Incredibly, the rise time is is 120ns and the fall time is 300ns. It is a cm300dy-12nf.
Thank you for the kind words :-D. I just figured out what some problem i was having was, it was an interrupter problem. Now i just wish i had a better scope to double check the bridge output voltage, but hopefully this scope is telling the truth and i really don't have any ringing. I have already run 600 amps, which would be enough current for probably 5 foot sparks.
Hey are you using a variable inductor on yours? Also have you tried using the phase lead shit on a half bridge. I cant get one of my boards to work on a half bridge. Never had a problem before.
Tab54o 5 months ago
@Tab54o In this video i used an air core inductor and a pot, but it always seemed to work best with the pot set at its lowest resistance, so now i use a carbon film resistor and a rewound variable inductor. I got the inductor from some old TV board (the kind with the threaded ferrite tuning slug in the metal can) and rewound it with around 22 turns of 32 gauge and it works fine. Now i have it set at a higher res freq and the waveform is around the same, and it ran 620 amps seemingly fine.
triggerhappy77707 5 months ago
@Tab54o Oh i forgot to mention i am using a halfbridge in this video. Without the phase lead shit, i killed a few IGBT bricks, and i haven't killed another one since using it. Finn Hammer is who i got the idea from, and Steve Ward used phase lead for his new driver board.
triggerhappy77707 5 months ago
@triggerhappy77707 Well I use phase lead too in my own driver design but only on one coil and the other day i built another board and could not get it working on a half bridge ended up switching it out for a regular driver. It must be that particular board my first one works fine.
Tab54o 5 months ago
@Tab54o I figured out my problem. My first board had an on board interrupter, the second didnt, the off board interrupter i had the voltage clipped to 5v with two diodes. It was casing the voltage on the phase comparator to ramp up and down and was fckign with the quality of the output signal lol. Now I just need to find a proper inductor.
Tab54o 5 months ago
Ya know your bridge looks fine I dont see how youd have excessive ringing on that.
Tab54o 5 months ago
@Tab54o Im assuming it is caused by the freewheeling diodes conducting. Finn Hammer's system showed the same amount of ringing with no phase lead.
triggerhappy77707 5 months ago
Comment removed
ubuntupokemoninc 6 months ago
Or maybe it was just too high frequency for the bricks.
Tab54o 6 months ago
@Tab54o The frequency in this video was about 44KHz, and i will be running about 64KHz, and this is a 4th (i think, don't quote me on this) generation cm300, so plenty fast enough. Incredibly, the rise time is is 120ns and the fall time is 300ns. It is a cm300dy-12nf.
triggerhappy77707 6 months ago
@Tab54o Oh, and you may have thought the freq was high because my cap bank looks rather small, but it is 680nf@6.4kvdc of CDE 942c series.
triggerhappy77707 6 months ago
@triggerhappy77707 Yeah it did look kinda small.
Tab54o 6 months ago
Thank you for the kind words :-D. I just figured out what some problem i was having was, it was an interrupter problem. Now i just wish i had a better scope to double check the bridge output voltage, but hopefully this scope is telling the truth and i really don't have any ringing. I have already run 600 amps, which would be enough current for probably 5 foot sparks.
triggerhappy77707 6 months ago
Very nice. Hope to see sparks soon
CrashByron 6 months ago