SU373907A1 - DEVICE FOR POWER SUPPLY OF GAS-DISCHARGE PULSE LAMPS - Google Patents

Description

one

Apparatuses for supplying gas-discharge flash lamps, such as lamps for pumping optical quantum generators, containing a source of constant voltage, shunted by a capacitor, a switch made as a bridge on four controlled valves, such as thyristors, and a working capacitor are known. The disadvantages of And such ycTpoiicTB are the lack of working capacity at high frequencies of the order of tens and hundreds of kilohertz at high average power emitted in the lamp, the possibility of transition to the stationary burning mode, which leads to a lamp failure, and low quality. DG as a result of power loss in the current-limiting element.

In the proposed device, a working capacitor is included in one of the diagonals of the bridge, in the other diagonal of which is connected to the source of a STANDING. A HIGH voltage, includes a flash lamp.

Such an embodiment of the device makes it possible to increase the frequency of the unipolar current pulses and to double the pairing and the lamp.

In order to limit the amplitude and speed of the current increase and increase the duration of the pulse in the diagonal connected to a constant voltage source, inductance may be included in series with which a flash lamp is switched on.

A pulsed lamp can be connected to the bridge diagonal via a matching transformer, the primary winding of which is connected between the negative terminal of the DC voltage source and the switch, which allows the operating voltage of the lamp to be matched to the voltage of the power source.

FIG. 1-3 are given the scheme of the described device.

The anode of the lamp L (see Fig. 1) is connected to the positive terminal of the direct current source Vn through a switch made on controlled TI-T valves connected in a bridge circuit with a switching capacitor Sk in the diagonal and a cathode to the negative terminal . Source is a shunti condenser.

When an ignition pulse, in particular, an external pulse, is applied to the lamp and as a result of the control unit signal (not shown), controlled valves (thyristors), for example, TI and Gz along the circuit: plus power supply - TI - capacitor C): - valve Gz - anode of the lamp L - minus the power supply - current flows and the capacitance Sk is charged (the polarity is indicated without brackets). The control valves TI and 7h are closed. The circuit is ready to work in a given mode.

At the time of unlocking the T2 and T valves and with the appropriate ionization of the lamp, the current flows through the circuit: plus power source — TZ gate — capacitance Cic — T gate — anode of the lamp L — cathode of the lamp — minus the power source. The switching capacitance Ck is recharged (the polarity is indicated in parentheses), and the valves TZ and G4 are closed and interrupt the operating current in the lamp.

The processes are repeated with a frequency corresponding to the frequency of the triggering pulses arriving at the control gates from the control unit.

Consistently with the lamp L (see Fig. 2), in particular between the anode of the lamp and the switch, inductance L can be switched on, which allows limiting the amplitude of the current flowing through and controlled T and G4 gates, reducing its rise slope as well as increase the duration of the flash.

In the discharge circuit (see Fig. 3), the primary winding of the matching transformer Tp may be included, to the terminals of the secondary winding of which the lamp // is connected (or, if necessary, several lamps). Such an embodiment of the device allows matching the lamp's operating voltage (1-5 kV) with the voltage of the power source (27-220 V) without the use of auxiliary

devices (swept: weft converters, step-up transformers, etc.). The dimensions and weight of the matching transformer Tp are small, since the operating frequency for which it is designed is at least several kilohertz. In this case, at the time of recharging the capacitor, SC, a voltage equal to twice the voltage of the power source is not applied to the gas discharge lamp, but to the primary winding of the matching transformer.

Subject invention

Claims (3)

1. A device for powering gas-discharge flash lamps, such as lamps for pumping optical quantum generators, containing a source of constant voltage, triggered by a capacitor, a switch, 0 made in the form of a bridge on four controlled valves, for example, on thyristors, and a working capacitor, characterized in that, in order to increase the frequency of unipolar current pulses and to double the voltage on the lamp, the working capacitor is included in one of the bridge diagonals, another diagonal of which is connected to a constant voltage source, includes a flash lamp. 2. The device according to claim 1, characterized in that, in order to limit the amplitude and rate of current rise and increase the pulse duration, an inductance is connected to a diagonal connected to a constant voltage source, in series with which a flash lamp is switched. 3. The device according to claim 1, characterized in that, in order to match the operating voltage of the lamia with the voltage of the power source, a flash lamp is inserted into the bridge diagonal through a matching transformer. t;