Paired dimmers for controlling harmonic currents

Details Paired dimmers for controlling harmonic currents Paired dimmers for controlling harmonic currents

1993-11-12

1996-04-09

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Keyboard operated or pattern controlled regulator

315DIG4, G05F 100

Patent

active

055064809

ABSTRACT:
A control system for a plurality of switched loads includes an AC line and a neutral wire and a pair of loads coupled in parallel between the AC line and the neutral. The switched loads may be operated so that one load in the pair operates in forward phase control mode and the other load in the pair operates in reverse phase control mode. This reduces harmonic current in the neutral wire otherwise resulting from odd order harmonics generated by the switching of AC current into the load during normal operation.

REFERENCES:
patent: 4688154 (1987-08-01), Nilssen
patent: 5004969 (1991-04-01), Schanin
patent: 5239255 (1993-08-01), Schanin et al.
"The ET Dimmer Test," John Huntington, Lighting Dimensions, Oct., 1991.
"The Impact of Degrading Energy Quality," Sam Johnson, LD&A, Jun. 1991.
"Nonlinear Loads Mean Trouble," Arthur Freund, EC & M, Mar. 1988.

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