SU1365376A1 - Lighting device - Google Patents

Abstract

FIELD: lighting engineering. The purpose of the invention is to increase the reliability of ignition of lamps. The goal is achieved by applying ignition voltages through series-connected current-limiting impedances 13 to several auxiliary electrodes 7, 8, 9 and 10 located on the side surface of the gas discharge lamp 5. To adjacent auxiliary gaps, formed by a series of spaced electrodes, the difference in ignition voltages, attached to the electrodes forming this auxiliary gap, put in antiphase. The ignition voltages required in amplitude and phase are formed by resonant circuits, each of which consists of inductors 11 and capacitance 12 connected in series. As a result, it is possible to obtain a high average electrical voltage of the ignition field at a relatively low maximum ignition voltage, -gots in the device. 2 Il. (L

Description

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The invention relates to the field of lighting and can be used to ignite gas discharge lamps, in particular fluorescent ones.

The purpose of the invention is to increase the reliability of ignition of a gas discharge lamp.

FIG. An electrical diagram of the lighting device is shown with separate resonant circuits for each auxiliary electrode i in FIG. 2 is an electrical circuit of a lighting device with symmetric resonant circuits.

The lighting device contains pins 1 and 2 for connecting a gas discharge lamp to which the main electrodes 3 and 4 of the gas discharge lamp 5 are connected; In the lamp burning mode, the value of the operating / current gas discharge lamp Un flowing under the voltage Un supply is limited by any type of current-limiting ballast 6 in series. On the side of the bulb of the lamp along its axis are auxiliary electrodes 7-10. Near house located electro

Dy, both the main and auxiliary, form between them auxiliary gaps.

Between the opposite terminals for connecting the gas-discharge lamp 1 and 2, circuits are connected in series with inductance coil 11 and capacitor 12 each. Half of these circuits are connected to one of the terminals for connecting a gas discharge lamp with a capacitor terminal, and another part of the circuits is connected to the same terminal for connecting a gas discharge lamp with an inductor terminal. The resonant frequency of the circuits is selected to correspond to the frequency of the gas discharge lamp supply.

The connection point of the inductor and capacitor of each circuit is connected through a series-connected current-limiting impedance 13 (of any type: resistor, electrical capacitance, etc.) with an auxiliary electrode. Moreover, the auxiliary electrodes connected to the circuits that are connected to the output for connecting the gas discharge lamp with the capacitor output are drawn with auxiliary electrodes, under

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connected to circuits, in which the leads of the inductance coils are connected to the same output terminal for connecting a gas discharge lamp.

The preferred order of connection of the auxiliary electrodes to the circuits depends on the ratio of the resonant frequency of the circuit and the frequency of the supply voltage of the gas discharge lamp. If the resonant frequency of the chain is less than the frequency of the supply voltage of the lamp, it is preferable to include inductance between the main electrode of the lamp and the nearest auxiliary electrode. If the resonant frequency of the circuit is greater than the frequency of the supply voltage, then between the main electrode of the lamp and the nearest auxiliary electrode is preferable

include an electric capacitor.

The lighting device works in the following way.

At the first instant of time, the lamp supply voltage is applied to pins 1 and 2 to connect a gas discharge lamp and acts on chains of series-connected inductance coils 11 and electrical

0 capacitor 12 each. As a result of resonance at the junction of the inductor coil and the capacitor, a voltage of ignition arises that is higher than the supply voltage of the U lamp. Moreover, in the circuits that are connected to the output for connecting the gas discharge lamp to the output of the capacitor, this voltage is antiphased ana0 to a logical voltage in the circuits, in which the leads of the inductance coils are connected to the same output for connecting the gas discharge lamp.

Resonantly increased voltage

The 5 plugs are applied to the auxiliary electrode through a series-connected current-limiting impedance 13, and voltage is applied to adjacent electrodes in the opposite phase using appropriate chains. Each auxiliary period is affected by a voltage equal to the difference of the voltages applied to the electrodes, which limit

g is the auxiliary span. Since the voltages applied to the electrodes limiting the auxiliary gap are chosen to be antiphase, the voltage amplitude is 136537

acting on the auxiliary gap is equal to the sum of the amplitudes of the voltages applied to the limiting electrodes, and the phase of the voltage acting on the auxiliary gap coincides with the phase of the voltage applied to the electrode, from which the voltage applied to the other limiting auxiliary gap is subtracted.

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Due to the fact that when

The lamps placed to the electrodes alternately phase out, and the conductors acting on the adjacent auxiliary gaps are also antiphase. Applying opposite phase voltages to adjacent electrodes increases the resulting voltage applied to a separate auxiliary gap and does not allow the device to exist between any two of its voltage points above the voltage applied to a separate auxiliary gap.

Under the influence of a voltage applied to the auxiliary gap, an initiating discharge arises in the internal volume of the lamp between the bounding electrodes. The sequence of initiating discharges in successive auxiliary gaps causes a through discharge between the main electrodes of the gas discharge lamp under the influence of the lamp supply voltage, which then puts the lamp into combustion mode.

A distinctive feature of the proposed lighting device is the symmetry of the ignition voltage with respect to the lamp supply voltage. In the electrical circuit of the device (Fig. 2), the resonating circuits are combined into two circuits distinguished by elements connected to the same

same as the main electrode of the lamp, which provides a stronger mutual influence of processes in the auxiliary gaps.

Claims (1)

Invention Formula A lighting device containing a gas discharge lamp with several auxiliary electrodes located on the side surface of the lamp along its discharge area, connected by main electrodes through current limiting impedance to the leads for connection to an AC mains supply, an ignition unit connected by an input to the main electrodes of the lamp and outputs to the auxiliary electrodes of the lamp, characterized in that, in order to increase the reliability of ignition of the lamp, the ignition unit is made in the form of at least two circuits of series-connected inductors and a capacitor each, whose resonant frequency corresponds to the frequency of the supply voltage network, and one part of these circuits is connected to one of the main electrodes of the lamp by the capacitor output, and the other part of the circuits is connected to the same electrode by the terminal of the inductor, the connection points of the inductors and the capacitors of the circuits are connected through auxiliary electrodes electrodes connected to circuits that are connected to the lamp main electrode by a capacitor lead are located between the auxiliary electrodes, under connected to the circuits, in which the inductor coils are connected to the main electrode of the lamp. Figg