Method and apparatus for controlling single or polyphase a.c. po

Details Method and apparatus for controlling single or polyphase a.c. po Method and apparatus for controlling single or polyphase a.c. po

1990-01-16

1992-10-27

Smith, Jr., David

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

323241, 318812, H02P 516, H02P 540

Patent

active

051596571

ABSTRACT:
A method and apparatus for controlling single or polyphase a.c. power controllers when controlling a.c. power controllers by means of phase angle control of semiconductor switches, the firing signals on the one hand must be long enough to guarantee a reliable firing and, on the other hand, be short enough to prevent an overloading of ignition amplifiers. According to the invention, therefore the use of firing signals with variable temporal lengths is provided, which end at least approximately at the reestablishment of the current flowing in the phase that has been fired. Moreover, devices for implementing the method are specified.

REFERENCES:
patent: 4426614 (1984-01-01), Nola
patent: 4439718 (1984-03-01), Nola
patent: 4459529 (1984-07-01), Johnson
patent: 4468603 (1984-08-01), Vander Meer et al.
patent: 4486824 (1984-12-01), Okuyama et al.
patent: 4710692 (1987-12-01), Libert et al.
patent: 5008608 (1991-04-01), Unsworth et al.

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