SU23273A1 - Cathode generator or amplifier - Google Patents

Description

The intra-tube capacitance between the anode and the grid in a conventional three-electrode lamp is known to create a connection between the anode circuit and the grid circuit. To prevent this connection, by changing the design of the lamp itself, it was proposed to introduce an additional grid, which shields the anode and, thus, destroys the interconnection between the anode contour and the grid contour. This method gives very good results, but is associated with a significant M complication of the lamp design and a significant increase in grid capacity and anode capacity, relative to the ground. The present invention aims to avoid capacitive coupling between the anode circuit and the grid circuit in a cathode oscillator or amplifier with oscillatory circuit, both in the grid circuit and in the anode circuit, by connecting the anode voltage source with its negative pole to the lamp grid. Thus, the supply current reaches the filament through self-induction or resistance included in the grid circuit.

In FIG. 1-10 depict various designs of a cathode generator or amplifier.

FIG. 1 shows a circuit of this kind in which the oscillatory circuits are located both in the grid circuit and in the circuit

anode. Instead of oscillatory circuits, transformers, reactive coils or resistances can be switched on, depending on the purpose of this circuit. Experience shows that in all: these cases, oscillations do not occur, even if the contours are tuned to resonance even when using lamps of the usual type. When applying the above scheme between the source of anode voltage and between the battery filament, there is an oscillatory potential difference, as a result of which special measures must be taken to eliminate the undesirable consequences of the presence of this potential difference. Such measures may be taken, as shown, for example, in FIG. 2, by incorporating jet coils / or plugging these coils / into battery circuit E, as shown in FIG. 3 bypassing them with a blocking capacitor K.

The absence of capacitive coupling between the chains of the anode and the grid at the indicated scheme and provided that the grid sufficiently shields the filament from the anode, can be seen from the diagram in FIG. 4, where L is the self-induction of the anode circuit; C-capacity; Z.1 - self-induction contour of the grid; C-the capacity of the contour of the grid; G is a grid. Intra tube capacitance between the anode

and the grid O and between the grid and nyo Cj is in this case connected in parallel with the capacitors of the circuits and does not cause any additional connection between these circuits. The device described, as already indicated above, can be used for all the usual purposes for which three-electrode lamps are used, taking into account, however, the fact that, due to the passage of the supply current through the grid circuit, the amplifying constant lamp will be reduced in an apparent manner that, however, does not have any sushi, of real significance at normal amplifying constants in conventional amplifying and, especially, powerful lamps, i.e., where they are expressed by a number of ten or more. The use of this anode battery attachment for oscillation generation is of particular interest in the case of oxide cathodes. Changes in the cathode and filament potentials during oscillations occur in the same direction, i.e., in other words, the potential difference between the anode and the filament with powerful oscillations does not exceed significantly the main voltage given by source E. The latter can be seen from the diagram in FIG. 5, where E is a constant voltage, and E is a rotating vector whose length depends on the self-induction of oscillatory circuits included in the anode, the potential difference between the anode and the filament in the case of the proposed circuit is the segment ST, which is the result of the addition the projections of the segment and the vectors E 1 e e represent the voltage in the cathode circuit and rotate synchronously with the vector ./. To excite oscillations, one can use either inductive coupling between two circuits, which are included in the anode circuit and the filament, as shown in fig. 1, or into a capacitive coupling between these circuits, or a capacitive or inductive coupling between the loop and one of the circuits, or a reactive coil in the other. When using inductive coupling, the direction of the turns must be the opposite of that used in conventional circuits. When using capacitive coupling, the coupling capacitor must be switched on at any points of self-induction or capacitance of the circuits and the anode and filaments. In particular, the most significant effect of this capacitor Q is when it directly connects the anode and the filament, as shown in FIG. b.

In amplifying devices, this scheme makes it possible to dispense with neutrodin capacitors and thereby facilitates the design of oscillatory circuits, especially with high-power short-wave and ultra-short-wave devices. For example, for the purpose of neutralizing intra-tube capacitances, it is possible to connect the source of anode voltage not directly to the grid, but to some part of the self-induction coils of the KOH circuit connected to the grid, as shown in FIG. 7 and 10, either through the reactive coil D (Fig. 8), or through the capacitor L (Fig. 9).

The subject of the patent.

1. A cathode generator or an amplifier with an oscillating circuit in both the grid circuit and the anode circuit, characterized in that, in order to avoid capacitive coupling between the anode circuit and the grid circuit, the source providing the anodic voltage is connected to its negative pole lamp grid.

2. In the case of a suitable generator or amplifier described in paragraph 1 of the short-circuit, it is included in the incandescent circuit of reactive KatunShK, which can be either independent or strongly connected with each other.

3. In the case of the hemmer or amplifier described in paragraph 2, use of a blocking capacitor / G, which together with the reactive coils / inductive resistance for alternating current between the lamp and the anode voltage source (Fig. 3).

4. In the case of a cathode generator or amplifier described in Sections 1-3, use a capacitor connected between the anode and the grid, or between any points of the anode circuit and the grid to obtain a capacitive coupling between the grid and the anode for regeneration.

5. When characterized in paragraphs 1-3

“Using a natural generator or amplifier to apply between the grid and anode circuit for the purpose of regeneration of inductive communication, obtained, for example, by; appropriate arrangement of self-i inductions of these circuits or by a separate intermediate circuit, serving for | connection.j

6. The form is fulfilled; -sh characterized i

1, 2 and 3 of a cathode generator or amplifier, characterized in that the anode voltage source is connected to the grid through a jet coil (Fig. 8) or through a capacitor (Fig. 9) or the grid is connected, for example, for the purpose of neutralizing intra-tube capacitances to a part of the turns of the KOH circuit (Fig. 10).

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