SU951470A1 - Pulse gas-discharge apparatus - Google Patents

Description

one

The invention relates to gas discharge technology, in particular to pulsed gas discharge devices with grid control of switching moments.

and switching off the switched current without removing the anode voltage, intended for use in section; personal radio devices.

Gas-discharge pulse devices are known, for example, Tacitrons, in which, with the aid of a dense fine-grain grid, control is made of switching on and off switching current without removing the anode voltage t.1 J

The disadvantages of the known devices are the limited amount of current to be switched off, the long time it is turned off, and the greater control power. This is due to the fact that, with an economically feasible and practically provided control power in the specified device, it is impossible to quickly apply a negative blocking voltage to the grid sufficient to extinguish a high-current discharge, since a large ion current of the grid creates an output impedance during the period of discharge suppression signal source is a positive voltage that compensates for negative blocking bias.

Closest to the proposed

ten . is a pulsed gas discharge device containing an anode, a cathode with a screen, a control grid and a switching device made. in the form of auxiliary grids and anode.

15 In this device between the control. an external capacitor is connected by a grid and auxiliary agud, which makes it possible to reduce the time of discharge discharge

20 and control power in several orders of magnitude compared to tacitron

However, the drawback of the device is an increase in the discharge quenching time in the high current mode due to the significant inductance of the auxiliary anode circuit — the external capacitor — the control grid. The purpose of the invention is to reduce the discharge quenching time in the instrument in the high-precision mode. The goal is achieved by the fact that the control grid, the auxiliary anode and the grid are made with cylindrical sections, with the said sections of the controlling grid, the auxiliary anode and the grid covering the correspondingly cylindrical sections of the auxiliary anode, the auxiliary grid and the screen; the screen is made with a hole on the surface facing the surface of the auxiliary grid, and the space between the cylindrical sides of the auxiliary anode and control grid is filled with a dielectric. Figure 1 shows the device; FIG. 2 is a variation of its power up scheme. The device contains an anode 1, a control grid 2 of a cup-shaped form, a cathode 3 with a cylindrical screen k, and also a damping device containing a cylindrical anode 5 located inside the control grid coaxially with its internal non-working cylindrical surface ancillary grid 6 in the form of a cylindrical surface covered with a fine-structured net on lot, 7 and located against the holes of the cathode screen. The space between the internal non-working surface of the cylindrical grid 2 and the anode 5 is filled with dielectric 8 with a high dielectric constant value. The specified dielectric 8 may be located between the electrodes 2 and 5 and on the outer side of the shell of the device. Functionally, the device can be considered consisting of a switching part containing an anode 1, grid 2, cathode 3 screen k, and a damping device containing an anode 5 grid 6 and an additional capacitor formed by elements 2.5 and 8. The device works as follows The state (Fig. 2} of the device is locked across grids 2 and 6 by negative voltage Esm applied through resistors Ja.i. From. An positive voltage from source E is applied to anodes 1 and 5. With the arrival of a positive control signal (grid 2 Cher, without the element RI between ano House 1 and cathode 3 with screen A. Discharge current arises. Capacitor O, formed by elements 2.5 and 8 (Fig. 1 and capacitor C, which is outside the device, is charged in its original state to a potential difference (EL, + ) .. This potential difference is also maintained during the passage of the tone through the switching part of the device through the EQ circuit - anode 1, cathode 3 with screen t, since the device remains locked along the anode 5 by a negative offset on the grid 6. After the termination of the control signal Ugj on grid 2, the current through the switching part of the device does not stop, since Tel'nykh voltage compensated voltage drop of ion current on a large mesh 2 .razv dressing resistance R, included in the external circuit between the grid 2 and a source of actuating signals lJex.j. The discharge plasma arising inside the cylindrical cathode screen k (Fig. 1) borders on the grid 6 of the damping device, and after the control positive signal arrives on the grid 6 (/ y, (Fig 2), the gap of the anode 5 is broken through the grid 6. Breakdown This gap occurs in a very short time, since the time for developing a discharge in the circuit of the anode 5 is virtually zero due to the presence of plasma formed by the main current and the relatively high potential of the anode 5 of the damping device, while the plates of the capacitors, Cj. anode m 5 of the damping device acquire the plasma potential, and the plates of the same capacitors connected to the control grid 2 turn out to be at a negative potential (Un + / ECM / relative to the plasma, which leads to the discharge quenching. Eq + / Ес (у) is established by adjustable sources Е Q and ЕС. Since in the proposed construction of the device the parasitic inductance of the circuit: anode 5 capacitance C, - gt 2, conventionally indicated in the diagram as U. is shunted by internal capacitance C, the rate of application of negative for example tim C oj + / ESLL / control grid 2 at the time of unlocking quench tron devices It appears very high. This leads to a sharp decrease in the high-current discharge time.

The circuit in FIG. 2 is a variant of the modulator with inductive energy storage. During the period of high-speed quenching of a high-current discharge on the inductance U, a high-voltage impulse and gibix arises through the separating capacitance C to the load I, and equal to

j bchg

where Dcd is the amplitude of the current in the circuit U-j and the anode 1 at the moment of time preceding the discharge quenching;

SSSL current quenching time After the termination of the control pulse Ug ' -Ha to the grid 6 of the extinguishing device, the current in the anode circuit 5 stops. At the end of the operation cycle of the device. The device has multiple actions.

As the tests show, the proposed device allows to significantly reduce the discharge quenching time in high-current mode (at currents of the order of thousands of amperes) in gas-discharge pulse devices with grid control and current interruption without removing the anode voltage.

The most effective use of the instrument is in devices with inductive energy storage, which allows a significant increase in the level of their output power, efficiency and improved volume and weight characteristics of the equipment.

Claims (2)

1.Geren A.I. et al. High-power metallocerMIC tacitrons. Radio Tech, 1973, № 3. 2. USSR author's certificate for application number 2057801/25 31.05-7. cl. n 01 j / (prototype).