Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1990-10-18
1992-07-14
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315206, 315223, 315DIG7, 331112, H05B 3702
Patent
active
051306093
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to light sources, and more particularly to those which produce electro-magnetic energy in the visible range for the purpose of illuminating any element in any field, be it industrial, commercial, advertising, domestic, etc.
There are in existence currently numerous light sources producing an energy in the form of an electro-magnetic radiation in the visible range. These sources essentially comprise a closed chamber, generally containing a rare gas such as argon, neon, krypton, etc., or a mixture of these gases, this chamber comprising, within it, electrodes of varying degrees of complexity which pass through its wall towards the exterior via sealed passages. These electrodes are themselves connected to the output terminals of an electronic circuit for generating a supply electric current, this circuit being capable of being supplied from various energy sources. These sources are those supplying an alternating current which may be rectified, or indeed batteries, accumulators or the like supplying direct current directly.
The electronic circuits known at the present time are fairly complex, since they generally necessitate, being based on alternating current, a certain number of sub-assemblies which are, generally, transformers, rectifiers, oscillatory circuits, as well as associated peripheral circuits permitting the supply of electrical pulses for initiating a discharge between the two electrodes situated within the chamber and thus the production, by various phenomena which are known per se, of an emission of electromagnetic waves.
In fact, it is found that the light sources which have been developed up to the present time give relatively good results. However, in spite of all this, they require electronic supply circuits which are very complex, heavy and burdensome and which, furthermore, on account of their design, give rise to a relatively short service life of the chambers. It even happens that these light sources, on account of certain failures of components which participate in their construction, are unable to produce their emission of electromagnetic waves any longer.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a light source of an electromagnetic radiation in the visible range, comprising a minimum of components, capable of operating from a source of alternating as well as direct electrical energy, and permitting the achievement of a service life of these components which is far longer than that which is achieved with the light sources of the same type of the prior art, and especially a light source comprising circuits which are relatively simply and not excessively burdensome, which have a small space requirement and which achieve the ignition thereof instantaneously.
More specifically, the subject of the present invention is a light source characterized in that it comprises:
a supply potential terminal,
a reference potential terminal,
a transformer coil having a primary incorporating at least two first and second windings an a secondary incorporating at least one winding,
a transistor incorporating three first, second and third electrodes,
first means for connection of said supply potential terminal to a first end of said first winding of the primary,
second means for connection of the second end of said first winding of said primary to a first electrode of said transistor,
third means for connection of the second electrode of said transistor to a first end of said second winding of the primary,
a load capacitor,
fourth means for connection of the second end of said second winding of said primary to a terminal of said load capacitor,
fifth means for connection of the other terminal of said load capacitor to said reference potential terminal,
sixth means for connection of the third electrode of said transistor to said reference potential terminal,
resistive means capable of connecting said supply potential terminal to said terminal of said load capacitor which is connected to the second end of the second
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patent: 2982881 (1961-05-01), Reich
patent: 3249892 (1966-05-01), Van Geen
patent: 3417306 (1968-12-01), Knak
patent: 3448335 (1969-06-01), Gregory et al.
patent: 4682082 (1987-07-01), MacAskill et al.
patent: 4700112 (1987-10-01), Chang
LaRoche Eugene R.
Yll Do Hyun
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