Here you can see how the little circuits I have described hook together to form the finished OLTC II. Some small parts are not shown, such as the power supplies for the trigger generator, and IGBT driver.
"It was a dark and dreary night in January, when I first beheld the accomplishment of my coil."
System block diagram. Click image for larger printable version
Note: The trigger generator runs off the thyristor driver's 12V rail.
Short circuit protection, click to enlarge
IGBT driver sheet 1/2 (click to enlarge)
IGBT driver sheet 2/2 (click to enlarge)
Note: The IGBT driver power supply is not shown. It uses a 15-0-15V transformer with rectifier, filter caps, 7812 and 7805 regulators for the +12 and +5 rails, and a LM317 giving an adjustable 20 to 30V rail.
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