SU1417216A1 - Method of initiating gas-discharge lamp with several external auxiliary electrodes - Google Patents

Abstract

The invention relates to electrical engineering and can be used to ignite, for example, fluorescent lamps without the use of starters. The purpose of the invention is to increase the reliability of ignition of the lamp. A feature of the method is that in addition to supplying alternating voltages to the main electrodes of the lamp, alternating alternating ignition voltages are also supplied to at least two auxiliary electrodes, and the voltages supplied to adjacent auxiliary electrodes are applied in antiphase. As a result, initiating discharges occur in the internal volume of the lamp between the gap-limiting electrodes, which cause a through-discharge between the main electrodes of the lamp under the influence of the lamp supply voltage, which then puts the lamp into combustion mode. 2 Il. i (L

Description

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The invention relates to electrical engineering and can be used to ignite gas-discharge lamps, in particular fluorescent ones, without the use of starters.

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

FIG. Figure 1 shows the space-time diagram of the method for igniting a gas discharge lamp; in fig. 2 is an electrical circuit of the device implementing this method.

The supply voltage of the gas discharge lamp 1 (. 1) Un through a series-connected current-limiting ballast 2 (of any type) is fed to pins 3 and 4 to connect the gas discharge lamp. The main electrodes 5 and 6 of the lamp are connected to these terminals for connecting the gas-discharge lamp. Auxiliary electrodes 7, 8, 9, and 10 are located on the outer side surface of the bulb of the lamp along its axis. Nearly located electrodes (both main and auxiliary) form between them auxiliary gaps.

Ignition voltages are applied to the auxiliary electrodes to ignite the gas discharge lamp: Jsj is applied to electrode 7, Uaz electrode 8, Uss electrode 9, to Un electrode 10, etc., if the auxiliary electrodes are greater. in antiphase voltage Uzg, voltage Uzg is in antiphase voltage, etc. (see graphs in Fig. 1, where t is time). Voltages and U: i3 are in phase and can be taken from a single source marriages, as well as tensions Uzg and Uat.

Each auxiliary gap is affected by a voltage equal to the difference of the voltages applied to the electrodes, this limiting gap is limited to it. If the voltages applied to the electrodes, limited by their auxiliary gap, are in antiphase, then the amplitude of the voltage acting on the auxiliary gap is equal to the sum of the amplitudes of the voltages applied to the limiting electrodes. For auxiliary gaps bounded by auxiliary electrodes, the condition of adding the ignition voltage amplitudes is satisfied. To increase the reliability of ignition of the gas discharge lamp, it is advisable that the voltage amplitude addition condition also be fulfilled for auxiliary gaps, in which one of the main electrodes is limited. This condition is satisfied directly when the lamp ignitor is executed.

In this case, the phase of the voltage applied to the auxiliary gap coincides with the phase of the voltage applied to the electrode, from which the voltage 0

applied to another limiting auxiliary gap electrode. Since the voltages applied to the lamda electrodes are alternately antiphase, the voltages applied to the adjacent auxiliary gaps are also antiphase.

Under the influence of a voltage applied to the auxiliary gap, an initiating discharge arises in the internal volume of the lamp between the electrodes limiting the gap. The current of the initiating discharge is closed by capacitive currents through the wall of the bulb,

c which limits the ionization region, and is located outside the auxiliary electrode. This phenomenon limits the magnitude of the initiating current in this auxiliary gap. If such a limitation of the magnitude of the initiating current is not enough, then a resistor is switched on in succession to the current target.

The sequence of initiating bits in successive auxiliary gaps causes

5 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.

The choice of the length of the auxiliary spans and the magnitudes of the ignition directions can create a high local electric field strength in the auxiliary gap confidently causing the initiating discharge, and thereby ensure reliable ignition of the gas discharge lamp. At the same time, due to the out-of-phase voltages applied to adjacent auxiliary gaps, at no point of the lamp and the device for its ignition does a voltage occur that exceeds the voltage applied to one auxiliary range.

The method is carried out by a device for igniting a gas discharge lamp, the electrical circuit of which is shown in FIG. 2. The device contains a transformer, the water output of the primary winding 11 of which is connected to mutually opposite pins 3 and 4 for connecting a gas discharge lamp 1. In this device the secondary winding consists of several sections 12 (for this device, 12.1 -

0 12.5). Each of the sections of the secondary winding through a series-connected resistor 13 (13.1 - 13.5) is connected in parallel to the auxiliary gap, and to the adjacent auxiliary gaps of the secondary winding section are connected

5 counter.

The minimum resistance value of the resistors is chosen from the following conditions: the initiating current through the auxiliary cable

the snatch should not lead to a significant reduction in ignition voltages applied to other auxiliary gaps; the current through the auxiliary gaps in the lamp burning mode should not lead to significant energy losses in the device for igniting the gas discharge lamp; accidental contact of the person with the auxiliary electrode should not lead to a current through the human body that exceeds the permissible value according to safety standards. On the other hand, the maximum resistance value of the resistor 13 is chosen from the condition that the initiating current in the auxiliary gap is sufficient for an ionization level that ensures reliable ignition of the lamp.

A device for igniting a gas discharge lamp operates as follows.

At the first moment, the lamp supply voltage Un flows to pins 3 and 4 to connect a gas discharge lamp and to the leads of the transformer primary winding 11 and from the leads of sections of the secondary winding 12 through the ignition voltage resistors 13 to the electrodes limiting

0

0

auxiliary gaps. Under the influence of applied voltages, initiating discharges occur in the auxiliary gaps, which lead to the creation of a through-discharge in the lamp between the main electrodes 5 and 6.

After ignition of the lamp, the voltage at the terminals for connecting the gas discharge lamp is reduced, which leads to a decrease in the power consumption of the device for igniting the lamp.

Claims (1)

Invention Formula A method for igniting a gas discharge lamp with several external auxiliary electrodes located on the side of the lamp at which alternating supply voltage is applied to the main and ignition voltage to additional lamp electrodes, characterized in that, in order to increase the reliability of the lamp ignition, to additional electrodes At least two times, alternating ignition voltages are applied, and the voltages applied to adjacent electrodes are applied in counterphase. Klf &  and,  P 9