SU568225A1 - Discharge lamp igniting device - Google Patents

Description

(54) DEVICE FOR IGNITING HAEOTABLE

LAMP

SUBSTANCE: invention relates to obpasti pulsed ignition of gas discharge pamps, in HACTHODTs of high aperture | powered by AC power.

Known ignition devices are known based on semiconductor diodes and resistors, in which the control of the thyristor at the accumulative capacity of the accumulator capacitance is injected with a phase-opposite phase voltage of the supply voltage.

However, the use of a resistor in such devices PP control thyrist; oro. does not eliminate the temperature instability of the impulses, and the circuit is not capable, without additional complications, to ensure the ignition of the igniter with the lamp burning conditions in its paapsma mode.

The closest to the invention is an ignition device containing an impulse nLM autotransformer, the secondary up-winding of which is connected to one of the lamp epegrodovs, a separation capacitor and a charge serially connected in a closed loop with the primary winding of the autotransformer and the thyristor. The management of tyrnsfmbM is carried out by using ohmic healer 2.

The presence of two capacitors in such circuits leads to a doubling of the voltage applied to the thyristor. On ohaco, the use of an ohmic divider in a control circuit with a system with a map controlled by K is not very reliable due to the influence of ambient temperature.

The aim of the invention is to increase the reliability of the device by improving the parameters of the ignition pulses.

This goal is achieved by the fact that a device for igniting gas discharge lamps from an AC network contains a pulse autotransformer, one end of the windings of which is connected to the first output terminal for connecting the lamp, 11 through a coupling capacitor to the second output terminal for connecting the lamp and the primary the winding is included in the circuit formed by the thyristor and the discharge capacitor, and is connected with the dead end to the common point with an increase

A coupling and separation capacitor is equipped with a chain of two Zener diodes and a resistor in series, the anode of the first Zener diode is connected to the cathode of the Thyristor, the control electrode of which is connected to the common point of the Zener diodes, and a free output of the connection resistor with the second output terminal for connecting the pump.

FIG. 1 is a schematic diagram of the device for igniting gas discharge pamps; in fig. 2, voltage and current diagrams are given for a lower unit operation. .

The device for igniting the gas discharge pamp contains a pulse autotransformer with windings of secondary boost 1 and primary 2, split 3 and discharge 4 condensates, a thyristor controlled chain of successively connected semi-zener diodes with resistor 7 and a shunt thyristor branch 8

In the current half-cycle of the supply voltage (curve 9 in Fig. 2), the capacitor 4 is charged to the amplitude value (curve 1 O in Fig. 2) along the circuit: secondary winding 1 of the pulse autotransformer, torus, zener diodes 6 and resistor 7. Since the control The transducer is 5 for, shunted relative to the cathode by mixing with the first zener diode, then the thyristor is closed for the entire half-year period. A capacitor charge current flows through the circuit of the device. 4 (curve 11 in Fig. 2).

As the capacitor’s charge point is reached, current flow ceases. A further decrease in the half-sine voltage of the tension voltage leads to an application; in reverse bias to stabilitron in voltage of a charged capacitor (curve 12 in fig. 2). Full voltage this voltage will be applied at the transition point of curve 9 from positive to negative and negative.

In the negative half-period, the voltage of the charged capacitor and the supply network is added, and therefore, curve 12 rises above the amplitude value. When the stabilization threshold determined by the stabilizer 6 begins to flow, a reverse bias current (curve 13 in Fig. 2) begins to flow into the control circuit of the thyristor, which then opens. There is an instant discharge of condensation 4, and, accordingly, the formation of

in the secondary winding of 1 autotransformer b1 1 high-voltage pulse.

After the co-sensor is discharged, the voltage of the zener diode abruptly drops to the value of the supply network, so that the current flow (curve 13) stops and the thyristor goes into a static closed state.

The use of a chain of series-connected zener diodes in the cathode part of the thyristor with voltage stabilization. A higher peak value of the power supply of the network allows to obtain a low current consumption, to increase the degree of protection of the thyristor, thereby increasing the efficiency and reliability of the device.

The ambient temperature does not affect the pulse parameters. All these advantages make it possible to have a device of small size, but with better quality properties.

Claims (2)

1. Japanese patent number 49-787. cl. 93 D O1.1974g. 2. Patent of Arglia No. 1268054 Cl. H 2 H, 1972.