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This thread will be about a circuit, hooked up to a permanent magnet AC generator, that will generate sparks between to electrodes, timed in relation to the physical position of the AC generators rotor. So when the rotor is a position call it "A", a spark should be generated.
An alternative formulation, for you who know some about internal combustion engines, would be that I'm building an ignition system that will fire a spark everytime the generator flywheel is in a particular place.
Spark generation is principally achieved by parallelling the generator with a switch and a kind of transformer called an ignition coil.
The generator coil is grounded for some time by the transistor, and then released. That creates a voltage peak, that in its turn creates a rapidly rising current in the ignition coil primary side. When the change in current and therefore the magnetic flux in the coil is high enough, the voltage on the transformer secondary side becomes high enough too create a spark between the electrodes.
My circuit will decide when and how long the transformer is to be grounded.
Here is a picture on the circuit in question:
It's a rather clumsy thing intended for development and prototyping.
It's based around an Atmega168, currently not in position.
Localisations of the rotors current position is done with a hallswitch placed on the stator, as the generator magnets are attached to the rotor.
I'm going to write more on this subject in this thread and on my blog, first post can be found here:
https://mechatronicsblogger.blogspot.se/2013/07/creation-of-ignition-system-introduction.html
An alternative formulation, for you who know some about internal combustion engines, would be that I'm building an ignition system that will fire a spark everytime the generator flywheel is in a particular place.
Spark generation is principally achieved by parallelling the generator with a switch and a kind of transformer called an ignition coil.
The generator coil is grounded for some time by the transistor, and then released. That creates a voltage peak, that in its turn creates a rapidly rising current in the ignition coil primary side. When the change in current and therefore the magnetic flux in the coil is high enough, the voltage on the transformer secondary side becomes high enough too create a spark between the electrodes.
My circuit will decide when and how long the transformer is to be grounded.
Here is a picture on the circuit in question:
It's a rather clumsy thing intended for development and prototyping.
It's based around an Atmega168, currently not in position.
Localisations of the rotors current position is done with a hallswitch placed on the stator, as the generator magnets are attached to the rotor.
I'm going to write more on this subject in this thread and on my blog, first post can be found here:
https://mechatronicsblogger.blogspot.se/2013/07/creation-of-ignition-system-introduction.html
