Method and arrangement for controlling the output of a load conn

Details Method and arrangement for controlling the output of a load conn Method and arrangement for controlling the output of a load conn

1997-07-14

1999-09-21

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

323212, 327452, 388917, 363 96, H02J 301

Patent

active

059557940

ABSTRACT:
A method and arrangement for controlling the output of electrical consumers connected to ac line voltage, especially of electric motors and the like, in which the output is changed by changing the phase control of the electric alternating magnitude supplied to the consumer. The extent of the firing angle determining the extent of the phase control is varied toward larger or smaller values around the given reference value of the firing angle, which reference value corresponds to the desired power consumption, so that asymmetry of the firing angle is produced with respect to time between two successive full waves, whereby odd-numbered harmonics are sharply reduced as even-numbered harmonics slowly increase.

REFERENCES:
patent: 3863134 (1975-01-01), Pollard
patent: 4078168 (1978-03-01), Kelly
patent: 4554623 (1985-11-01), Ainsworth
patent: 4811236 (1989-03-01), Brennen et al.
patent: 4891570 (1990-01-01), Nakamura et al.

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