LV11879B - Circuit arrangement for electric lighting - Google Patents

Abstract

The invention concerns lighting systems. Basically, it can be used in indoor combined illumination systems.The purpose of the invention is to save electricity, to widen the range of usage conditions and to extend the period of validity. It contrasts all known systems, which consist of two luminescent lamps with rated voltage (127 V) and equal power combined into a single electrical circuit, which is connected to 220V phase voltage current network with the help of the permanent glow branch of the middle electrode of impendence bond with secondary winding. In the new system (see Fig. 1), three lamps are combined into a circuit and then connected to the current network through a common single-winding throttle. The last electrode filament thread of one lamp is allowed to burn out. Also, with the help of an over-computational filament lamp, a four-wired and three-phase transmission line is created without one phase and interrupted neutral conductor for starting-up two luminescent lamps from line strain, and for lighting up the third lamp from the neutral point displacement voltage. The over-computational filament lamp could also be used to form a variable ballast resistance in the event of voltage changes in the current network. It also could be used in combined circuits for luminescent lamp usage from the phase voltage, or used as a self-contained power supply.<IMAGE>

Description

Description of the Invention

ELECTRIC LIGHTING EQUIPMENT

The invention relates to the field of electric lighting and can be used mainly in combined lighting systems for rooms. Electrical lighting equipment consisting of 127 V rated fluorescent lamps is known [1], but direct connection of such lamps to the mains is possible only in the economically disadvantageous and therefore rarely used three-phase four-wire system with a voltage of 220/127 V, which greatly narrows their application range. .

The invention is closer to an electric lighting apparatus consisting of a series of two fluorescent lamps of a nominal voltage of 127 V of the same voltage connected to a mains voltage of 220 V through a double-winding ballast with a medium-filament continuous filament [2]. However, this unit also has the following major drawback: the dual-winding choke with additional branch winding has significant power losses and low power factor (coscp); one light bulb goes out, all lighting equipment stops working; it is not possible to create different lighting levels in the unit.

The object of the invention is to reduce power losses, extend the range of operation modes of the machine and reduce operating costs.

The object of the invention is achieved by using three series-connected 127 V fluorescent lamps of the same wattage which are connected to a 220 V mains voltage through a common single-ended ballast. From two series-switched fluorescent lamps and the additionally used recombinant incandescent bulbs, a three-phase four-wire system is developed without a single phase and an interrupted zero wire. This allows the switching set to start both fluorescent lamps from line voltage and to ignite the third fluorescent lamp from the neutral shear voltage of this system. The recombinant incandescent lamp can also be used to create variable ballast resistances at mains voltage changes, to operate two fluorescent lamps from phase voltage and can serve as an independent light source.

1. shows the circuit diagram of the electrical circuit elements of the proposed equipment.

The scheme is as follows. Throttle 3 is selected based on the total power of the three fluorescent lamps and their rated current. The fluorescent lamp 4 is started in the cold ignition variant and may have a burner 5 in the middle electrode. Fluorescent lamps 6 and 7 have electrode-heating starter starters 1 and 2. One compact universal switch can be used instead of all circuit-switched bipolar and unipolar switches.

The scheme works as follows. With the switches 11 and 15 in the lower position and the switch 14 in the upper position, the fluorescent lamps 4 and 6 at the closed switch 9 and the unlocked switches 7 and 13 receive a voltage higher than the phase voltage and light up momentarily. At the same time, between this circuit and the mains zero, a neutral shear voltage develops, which

The third fluorescent lamp 8 is also ignited after the switch 7 is closed. Further, switching the switch 14 to the lower position disconnects the incandescent lamp 12 and forms a circuit in which all three fluorescent lamps 4,6 and 8 are connected in series through a common ballast inductor 3 with rated operating parameters (basic mode). In the event that, due to a drop in the mains voltage level or due to differences in the rated values of the fluorescent lamps used, less current than that required is supplied through the fluorescent lamps, the filament lamp 12 is connected in parallel to the throttle 3 via switches 9 and 11

Conversely, if the flux current through the fluorescent lamps 4,6 and 8 in the main mode exceeds the nominal value, the total ballast resistance is increased by connecting the incandescent lamp 12 in series with the choke 3 via the upper position contact 11 and lower contact 9 of the switch 10. .

This circuit can also be used when only a series of switched-on fluorescent lamps 4 and 6 are operated at the rated voltage of the mains, with the switch off 7 and the switch 15 in the upper position. The switches 11, 14 and 15 are in the lower position on the switch 13. can be used as an autonomous light source in fluorescent lamp operating mode.

The operation of three fluorescent lamps from one common inductive ballast reduces power losses by 35% and increases the overall power factor of the unit by 25%.

The range of possible operating modes of the machine increases by

65%.

Thanks to the ability to use a single fluorescent bulb with a burned end electrode filament, the total lifetime of the machine is increased by 20%, reducing operating costs by 10%.

Sources of information:

1. L.Raicelskis Handbook of Lighting Networks. Riga, “The Flame, 1969, 367pp.

2. ΚλΜ.ΧΜΠΜΗσκΜΜ, B.fl.KyMMH SneKTpMHecKoe οσββιμβΗΜβ m o6nyMeHne. M Konoc, 1982, 272 c.

Claims (5)

Formula of the Invention 1. An electric lighting apparatus consisting of two series-connected fluorescent lamps of a nominal voltage of 127 V having the same wattage connected to a 220 V phase mains voltage through a double-winding ballast with a medium electrode constant voltage, with the aim of reducing operating mode, three series of fluorescent lamps connected in series to the mains through a common single-ended ballast. 2. A device according to claim 1, characterized in that, in order to reduce operating costs, one of the three fluorescent lamps connected in series is switched off or the end electrode filament is burnt. 3. An arrangement according to claim 1, characterized in that, by means of a recombinant incandescent lamp, a three-phase four-wire system without a single phase and an interrupted zero-wires for the discharge of two fluorescent lamps from the line voltage and a third fluorescent lamp from this system. 4. Equipment according to Clause 3 application for the generation of variable ballast resistances using a recombinant incandescent lamp in the event of a mains voltage change. 5. Equipment according to Clause 3 application for operation of two series-connected fluorescent lamps at phase voltage.