SU764156A1 - Device for firing gas discharge lamps - Google Patents

Description

(54) DEVICE FOR IGNITION OF GAS-DISCHARGE LAMPS

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The invention relates to electrical engineering.

An AC-powered gas discharge lamp ignition device is known that is based on the 5th spark generator lj.

The closest to the invention in its technical essence is a device comprising a step-up charging transformer, a storage condenser-10 tor, an uncontrolled switch air discharge) and a pulse ignition transformer. Usually, a switch in the circuit of this device is connected in series with the servo winding 15 of the pulse transformer in parallel with the high voltage winding of the charging transformer and the storage capacitor. It is also possible to connect the switch parallel to the secondary ob-20 coil of the charging transformer and turn on the storage capacitor in series with the primary winding of the pulse transformer 2.

However, when the switch 25 is triggered, there is a short break of the secondary winding of the charging transformer for some time, determined by the switch parameters, and, moreover, after the switch 30 trips

its transition to the constant burning mode is possible. This necessitates the implementation of a charge transformer with large magnetism scattering, which complicates its design and degrades the weight and size characteristics of the entire device. Elimination of the possibility of the occurrence of this mode is usually accomplished by complicating the design of the switch, for example, due to the increase in the number of spacing gaps.

The purpose of the invention is to provide forced switching of the switch and to limit the short-circuit current of the charging transformer.

To achieve this goal, an additional capacitor is connected in series with the switch.

FIG. Figure 1 shows the electrical circuit of the proposed ignition device when the switch is switched on in series; in fig. 2 - the same, with parallel.

Claims (2)

The ignition device includes a charging transformer} (Fig. 1), fed from an AC network, storage 2 and an additional 3 capacitors, the first of which is parallel to the secondary winding of transformer 1, and the second is connected to the same winding through serially connected switchboard 4 and the primary winding of the pulsed transformer 5. The device operates as follows,. When applying the power supply raster, to TipHMep, Starting from the zero phase angle, through the charging transformer 1 yrShz, charge the storage capacitor 2 to the same level as the switchgear 4. a high-voltage impulse that is transformed when the voltage is applied to the lamp. Simultaneously with the discharge of the storage capacitor 2, an additional capacitor 3 is charged, n | 5md. Up to a voltage level that ensures reliable locking of the switch 4. Then the process of charging the capacitor 3 is repeated, but at higher voltage levels until until the supply voltage has reached its maximum for the half voltage period of the network. After this, the process becomes reversed, since the voltage on storage capacitor 2 decreases until the voltage difference across the capacitor x 2 and 3 reaches the switching level of switch 4, which leads to a partial discharge of the additional capacitor 3 to the load capacitor 2 The discharge pulse of the additional capacitor 3, the passage through the primary winding of the pulse transformer 5, causes the ignition pulse to start on the secondary winding of the pulse transformer 5. This process impulses meat discharge additional capacitor 3 is repeated as long as the voltage thereon reaches zero crossings Thereafter additional capacitor 3 starts Torr pulsed be charged voltage feedback floor rnyty ayalogichnom in order. The number of ignition pulses and their amplitude for each power supply voltage period is determined by the output voltage of the transformer 1, the voltage of switch 4, the ratio of capacitors 2 and 3. The zero point ignition device diagram (Fig. 2) works as follows. same as previous circuit. The difference lies in the reverse polarity of the charge current pulses and the discharge of the storage capacitor. When an additional capacitor is used in the ignition device circuits, the short-circuit currents of the charging transformer are limited. As a result, the installed power of the proposed transformer is reduced, which significantly improves the weight and size characteristics of the entire device. Formula for Injection of gas discharge lamps powered by AC and containing increasing one transformer - storage capacitor connected in parallel with the secondary winding of the charge transformer , Uncontrolled emy KOivwyTaiop, connected to the secondary winding of said m eansformatora and connected in series with the primary winding of the ignition pulse transformer, characterized in that in order to provide forced commutation switch and limit short circuit current of the charging transformer, in series with the switch turned on an additional capacitor. Sources of information taken into account in the examination 1. M. Fugenfirov. Electrical circuits with gas discharge lamps. M., Energie, 1974, p.345-355. 2. Wasserman A. L. Starting device for high-power tubular xenon lamps DKsT20000.- Light engineering, 1963, 1, p. 7-li, (prototype). rvU. J0fi la.mpe F ".g. / i AD,