Twelve pulse AC motor drive

Details Twelve pulse AC motor drive Twelve pulse AC motor drive

1984-07-02

1986-01-21

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318341, 318809, 363 71, H02P 516

Patent

active

045659532

ABSTRACT:
A single microcomputer controls the firing time 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 or buffer. 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.

REFERENCES:
patent: 4090116 (1978-05-01), Lippitt
patent: 4267570 (1981-05-01), Braun
patent: 4364434 (1982-08-01), Morinaga
patent: 4399395 (1983-08-01), Espelage
patent: 4419615 (1983-12-01), Muto et al.
patent: 4426611 (1984-01-01), Espelage et al.
patent: 4427933 (1984-01-01), Wagener et al.
patent: 4449087 (1984-05-01), Lippitt et al.

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