SU121513A1 - The method of ignition fluorescent lamp - Google Patents

Description

Battery luminaires are known with a fluorescent lamp, fed through a dc-to-ac vibratory converter, equipped with two mechanically connected contact systems operating on the primary windings of two booster transformers, working and auxiliary, used for heating the lamp electrodes.

A feature of the proposed method of igniting a fluorescent lamp of such a lamp, with the aim of improving the safety of the latter, is to use for creating a glowing discharge between cold electrodes of a bulking voltage created by disconnecting the spark transformer from the high side of the working transformer discharge in the arc by heating these electrodes.

The drawing shows an electrical diagram of a device for igniting a fluorescent lamp according to the proposed method.

The luminescent lamp L of the luminaire is supplied with power from the battery B through a direct current transducer V to AC and step-up transformers Tpi and Tr. The Tpi transformer is used to power the lamp in operating mode and the Tpz transformer to heat its electrodes 5i and Eu in the ignition mode.

Converter B has a working coil B, with a working contact B connected in series with it and controls two mechanically connected contact systems Vz and B operating one (system BZ) on the working transformer Tp and the other (system B) on the heating transformer Tpz. Parallel to the secondary winding of the working transformer Tp, through the normally closed contacts / Cj of the start-up push-button switch, a spark-suppressing circuit consisting of capacitor C and resistance R is turned on.

No. 121513-2 -

The heating transformer Tr2 has on the high side two independent windings, each of which is connected to one of the heating electrodes E, Ea lamps L. Normally open contacts are connected to the circuit of its primary winding. To the same start-up push-button switch. Thus, in the operating mode, the heating transformer does not consume energy from battery B.

To start the lamp, the start switch button is pressed, which leads to opening of contacts Ki and closing of contacts K. As a result of disconnecting circuit R - C ", an increased voltage arises in the high side of the Tpi transformer, which causes ignition in the glow lamp between electrodes 5i and E .

This glowing discharge, however, cannot independently transform into an arc one, since its power is not sufficient to heat the electrodes and to produce thermoelectron emission.

To convert the glow discharge to the arc, a heating transformer Gra is used, which, when the K.2 contacts are closed, begins to receive power from the battery B of the luminaire. After the lamp is lit, the start switch button is released and the heating transformer is turned off. At the same time, through the contacts K: parallel to the secondary winding of the operating transformer, a spark-suppressing circuit is connected, and the circuit goes into normal operating mode.

Thus, the ignition of the lamp takes place with the simultaneous action of high voltage and heating. The high voltage serves to break the gas discharge and ignite the glow discharge, and the heating is used to convert the glow discharge to the arc.

In order to avoid the danger caused by the unloading of the heating transformer when the lamp electrodes burn out, and the occurrence of overvoltages in it, it is recommended to place a short-circuited brass tape under the windings on the heating transformer core.

Subject invention

A method of igniting a fluorescent lamp powered from a dc-to-d.vibration converter with two mechanically connected contact systems working one for a working step-up transformer and another for an auxiliary transformer by supplying an increased voltage to the electrodes while heating them, differing from that the increased voltage for igniting the glow discharge is created by disconnecting the spark-extinguishing circuit from the high side of the working transformer, and the translation is smoldering its discharge in the arc is carried out by heating both lamp electrodes by connecting them to a heating transformer simultaneously with switching off the spark suppressor circuit.