Electronics > Projects, Designs, and Technical Stuff
Transistor controlled ignition coil driver design-need suggestion pls.
LukeW:
There are IGBTs such as the ISL9V3040 that are specifically designed to stand up to the task.
soldar:
--- Quote from: Dundarave on March 20, 2019, 11:38:51 pm ---From what I can tell, if you still use the mechanical contacts, you've not really gained anything.
--- End quote ---
You're missing the points ;)
The entire point of a transistor-assisted circuit was that not all the current of the coil went through the points. That high current and the spark caused by the inductance is what wore and burnt the points. Once that current was being handled by the transistor the points could last virtually forever.
vk6zgo:
--- Quote from: soldar on March 22, 2019, 11:28:30 pm ---
--- Quote from: Dundarave on March 20, 2019, 11:38:51 pm ---From what I can tell, if you still use the mechanical contacts, you've not really gained anything.
--- End quote ---
You're missing the points ;)
The entire point of a transistor-assisted circuit was that not all the current of the coil went through the points. That high current and the spark caused by the inductance is what wore and burnt the points. Once that current was being handled by the transistor the points could last virtually forever.
--- End quote ---
Exactly!
Transistor assisted ignitions which retained the points were much more the rule than the exception, back in the '60s & '70s.
Just about every Elecronics magazine produced a number of such designs in those years.
They did give a better spark under test conditions, & the mags usually gave figures pointing this out.
In practice, though, those improvements didn't flow through to improved performance, so the long points life was the major benefit, & motive for builders.
Until factory made magnetic or optical replacements for the points became available, either intended for "homebrew" projects, or bought as parts from later vehicles, only the most dedicated experimenters went down the path of points elimination.
"Electronics Australia" did design & build an optical one, & some people built them, including my old Shift Boss, who was an inveterate tinkerer.
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