Twelve pulse ac motor drive

Details Twelve pulse ac motor drive Twelve pulse ac motor drive

H - Electricity

02

J

318/120, 321/98

H02J 3/38 (2006.01) H02M 1/084 (2006.01) H02M 7/529 (2006.01) H02P 23/00 (2006.01) H02M 7/48 (2006.01)

Patent

CA 1233509

TWELVE PULSE AC MOTOR DRIVE ABSTRACT OF THE DISCLOSURE A single microcomputer controls the firing angle determination for two independent current regulators for two six pulse AC/DC converters which are part of a twelve pulse parallel controlled current inverter (CCI) AC motor drive. A very short high priority interrupt occurs when a motor channel source converter thyristor fires. This interrupt calls a longer, low priority current regulator interrupt informing it that a master channel source converter thyristor has just been fired. The current regulator causes a count to be loaded into a master fire counter and also loads a firing mask into a hardware latch. When the master fire counter times out the next thyristor pair of the master channel source converter is fired directly out of hardware. Similarly, there is a separate slave channel fire counter loaded after the current regulator is called by a short high priority interrupt when a thyristor in the slave channel source converter fires.

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