Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1994-12-14
1996-06-18
Pascal, Robert
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315142, 315278, 315288, 315291, 323256, 323305, 323341, H05B 4116
Patent
active
055281109
ABSTRACT:
An improved voltage reduction apparatus specifically designed to overcome implementation problems of a prior art voltage reduction apparatus. The present invention is designed to overcome the problem of magnetic field flux induced harmonic distortion and heating associated with the prior art which otherwise substantially detracted from the advantageous implementation thereof. More specifically the present invention, also provides a highly advantageous apparatus for reducing voltage to a load, after first providing a full magnitude of voltage thereto by the use of an autotransformer having a series winding and a common winding disconnectable and connectable to one another by means of a relay or other equivalent switching device. However it also provides a bucking coil winding in parallel with the common winding and wound in bifilar opposed relation thereto. This bucking coil prevents harmonic distortion and heating effects of the prior art apparatus by effectively cancelling any magnetically induced voltage in the common winding. In addition, the improved apparatus of the present invention provides an additional switch or equivalent switching device which is interposed at the opposite end of the common winding in order to permit the common winding and bucking coil winding to be connected in parallel with each other, but completely disconnected electrically from the remaining portions of the circuit of the present invention in the full voltage mode.
REFERENCES:
patent: 4189664 (1980-02-01), Hirschfeld
patent: 4237403 (1980-12-01), Davis
patent: 4336490 (1982-06-01), Lewis
patent: 4390814 (1983-06-01), Peek
patent: 4431948 (1984-02-01), Elder et al.
patent: 4494010 (1985-01-01), Donnelly
Pascal Robert
Philogene Haissa
Tachner Leonard
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