SU1327331A1 - Device for supplying gas-discharge device with invariable current - Google Patents

Abstract

The invention relates to electrical engineering and m. used in power supplies for gas discharge devices, for example, lasers. The aim of the invention is to reduce the installed-power of the power elements of the device and to increase the reliability of the initiation of the discharge ignition. The device consists of partitioned rectifiers 3, 4 and 12, a matching transformer 2, a current source, 5 made, for example, in the form of an inductive-capacitive transducer, an ignition unit 6 with a capacitor 7, a threshold element 9 and a pulse transformer 8, the secondary winding of which is connected in series with the gas discharge device 14, diode 16 and filter capacitor 15. The device allows you to automatically turn off the ignition unit 6 after ignition of the discharge in the gas discharge device 14. 2Cp f-ly, 3 ill. (L 00 y 00 SAE

Description

The invention relates to electrical engineering and can be used in power supplies of loads with variable resistance, for example, gas discharge devices.

The purpose of the invention is to reduce the installed power of the power elements of the device and to increase the reliability of the initiation of the discharge ignition.

Fig. 1 shows an electrical block diagram of an embodiment of the device with an additional power source for the ignition unit; Fig. 2 is a block diagram of an embodiment of a device with a series connection of an additional power source; FIG. 3 is a block diagram of a device with a series connection of an additional power source, made in the form of a current source.

. The device consists of a main rectifying power supply unit 1 (FIG. 1), made of matching transformer 2 and sectioned rectifiers 3 and 4, connected by a J input to a current source 5, made, for example, in the form of an inductive-capacitive converter, unit 6

ignition, made in the form of after-. JQ, the voltage on the capacitor 7 becomes insufficient for triggering the threshold element 9, which ensures the automatic shutdown of the ignition unit 6. If for any reason,

-jE the current through the load will cease to us, then the capacitor 7 will again be charged to a voltage sufficient to operate the threshold element, and in the normal pulse winding

40 transformer 8 is again in high-voltage pulses, providing re-ignition of the gas discharge device 14. This allows the selection of a matching transformer 2,

The 45 sectioned rectifiers 3 and 4 and the filter capacitor 15 are not at the discharge voltage of the gas discharge gap of the device 14, but at the burning voltage, which leads to a significant decrease in the installed power of the power elements of the device to increase the reliability of discharge initiation.

The device (FIG. 2) works as follows.

When the device is turned on, the total voltage of the matching transformer 2 and the additional transformer 11 through the corresponding sections

of the ignition capacitor 7 of the primary winding of the pulse transformer 8 and the threshold element 9 and the additional rectifying unit 10, consisting of a power transformer 11 and rectifier 12. The output of the main rectifying device 1 through the ballast resistor 13 and the secondary winding of the transformer 8 connected to the terminals for connecting the gas discharge device 14 (lamps). The output of the additional rectifying unit 10 via a ballast resistor 13 is connected with the capacitor 7 of the ignition unit. At the input of the main rectifier unit 1, a filter capacitor 15 is turned on.

 In the embodiment of the device shown in Fig. 2, the additional rectifying unit 10 is connected in series with the main rectifying unit 1, and the unit 6 is behind; The signal is connected to the output of block 10 through a resistor 13 and a diode 16. A feature of the embodiment of the device shown in FIG. 3 is the power supply of the rectifier 12 connected in series with rectifier 3 and 4 from the matching

a transformer 2 coupled to an inductive-capacitive converter 5,

The device (figure 1) works as follows.

When the device is turned on, when there is no current in the load circuit, the output of the rectifier section 3 and 4 connected in series appears

overvoltage. At the same time, the capacitor 7 of the ignition unit 6 is charged through the ballast resistor 13 from the rectifier 12. After the voltage across the capacitor reaches the breakdown value of the threshold element 9, a capacitor is discharged through threshold 9 and the primary winding of the high voltage pulse transformer 8 is induced by high voltage pulses in the secondary winding, which are added to the voltage on the rectifier sections 3 and 4, initiating ignition of the discharge. The increased current in lamp 14 causes a drop in

tension on ballast resistance 13, which is simultaneously a discharge current sensor. This voltage drop (rot is subtracted from the voltage of the rectifier 5, resulting in 3 and 12,

1 connected

rectifiers 3, 4 in series, and the ballast resistor 13 is applied to the gas discharge device 14. At the same time, the capacitor 7 is charged from the rectifier 12 through the resistor 13 and the diode 16. After the voltage on the capacitors 7 reaches the breakdown value of the threshold element 9, the discharge occurs the capacitor 7 to the primary winding of the pulse transformer 8, inducing its secondary winding high-voltage pulses, which, adding to the voltage of the rectifiers 3, 4, and 12, initiate the ignition of the discharge. The current that is present in the load causes a voltage drop across the ballast resistor 13, which is also a discharge current sensor, and blocks the diode 16, which automatically switches off the ignition unit 6. If for any reason the current through the lamp 14 stops, then the diode 16 will open and at the output of the ignition unit 6 again high-voltage pulses will appear in the circuit, providing re-ignition of the gas discharge device 14,

Since part of the energy is transmitted through the channel of the voltage source, the elements of the inductive-capacitive converter are selected to a lower power. In addition, by selecting the voltage level of part 12 of the sectioned rectifier, it is possible to achieve the optimal pulse frequency on the secondary winding of the pulse transformer 8 by varying the charging time of the capacitor 7, thus increasing the reliability of the ignition unit.

The device (fig.Z) works as follows.

When a power supply device is fed to the input, when there is no current in the load circuit, the output voltage of the rectifier 3-5 is an increased voltage, part of which is charged by the capacitor 7 of the ignition unit through diode 16 and the ballast resistor 13. After the voltage on the capacitor 7 reaches the breakdown value of the threshold element 9, the capacitor 7 is discharged through the threshold element 9 and the primary winding of the high-voltage pulse transformer 8, which induces high-voltage pulses on its secondary winding, which are added to the voltage of the rectifier 3, 4, 12, initiate ignition

1 bit

The current in load 14 causes a voltage drop across the ballast resistance 13, at the same time acting as a discharge current sensor, connecting diode 16, which automatically switches off the ignition unit. If for any reason the current through the load stop

Then the diode 16 will open, and on the secondary winding of the pulse transformer 8 the high-voltage impulses are again delivered to the MS, providing secondary ignition of the gas discharge device. This allows

matching transformer 2, partitioned rectifier 3-5 and filtering capacitor 15 choose not the voltage of the gas discharge gap of the device 14, but the burning voltage of the discharge, which leads to a significant decrease in the installed power of the power elements of the device and to increase the reliability of discharge initiation Yes .

Claims (3)

1. A device for supplying a constant current to a gas-discharge device, containing a main accelerator power supply unit connected by an input to a current source, an ignition unit made in the form of a series-connected capacitor and a primary winding of a pulse transformer, connected the output of the additional rectifier power supply unit, the output of the main rectification power supply unit is connected with a ballast resistor and the secondary winding of the pulse transformer of the ignition unit with terminals for connecting the electrodes of the gas discharge device, characterized in that in order to reduce the installed power of the power elements of the device and increase the reliability of ignition initiation, the ignition unit is equipped with a threshold element connected between the free terminals of the capacitor and the primary winding a transformer, wherein the output of the auxiliary power supply unit is connected to the capacitor of the ignition unit via the above mentioned ballast resistor. 2. The device pop. 1, which differs from the fact that in the case of a serial connection of the main and additional rectifying power supply units, the common point 0 five 0 five 0 five their connections are connected to the capacitor of the ignition unit through an injected diode connected in the wire in the direction of the direction relative to the rectifier of the additional power supply unit. 3. The device according to Claim 1 or 2, T - is characterized by the fact that the power source of the additional rectifying unit is designed as a voltage source. GO dzie.g Editor I. Segl Nick Compiled by G. Kvashin Tehred A. Kravchuk Order 3401/57 Circulation 801 Subscription VNIISH USSR State Committee for Inventions and Discoveries 113035, Moscow, Z-3Z, 4/5 Raushsk nab. , Production and printing company, Uzhgorod, Projecto st., 4 Proofreader T. Kolb