SU50246A1 - Apparatus for generating sawtooth current pulses - Google Patents

Description

The present invention relates to a controllable device, for example, a combination consisting of a lamp and an auxiliary device having the characteristic shown in FIG. 1. This latter is characterized by the fact that it has two branches, the steepness of which differs sharply in size from each other and has opposite signs.

A device giving a similar characteristic is shown in FIG. 4. If the control voltage est applied to the ct terminals is strongly negative with respect to the grid, then it compensates for the voltage supplied by voltage source B. The lamp is thus locked by the voltage generated by battery A. When the control voltage Cst decreases, the grid becomes positive, and the anode current ia begins to increase. Finally, the glow-discharge lamp G is ignited and the voltage across it drops, as a result of which the grid potential, in view of the presence of batteries, makes a jump in the negative direction. The anode current ceases instantaneously, despite a further increase in the control voltage est.

The device according to the invention is shown in FIG. 2, where the letter O denotes a device having a characteristic corresponding to FIG. 1 (all auxiliary circuit elements are omitted in this figure). A coil L is connected to the anode circuit in series with the anodic battery Ea, the voltage from which is fully or partially supplied through capacitor C to the grid so that the changes in the anodic and grid voltages are in phase. The resting potential on the grid is determined by the resistance R.

It should be appreciated that, as shown in FIG. 3, for a certain period

time to point 4, the grid has a negative offset (Fig. 3A), the value of which is chosen so that the anode current of the lamp is locked. The capacitor is thus charged; it is discharged from the constant C / g time. Accordingly, the grid voltage increases.

After e reaches the one shown in FIG. 1 of the critical value for egkrit, the anode current r instantaneously ceases (Fig. 3). The consequence of this is that the Wits voltage jump Ea (up) on the anode (Fig. 3c) and, due to the presence of the coupling capacitor C, and on the grid. The latter creates a current jump, as a result of which the pulse decreases, the duration of which is determined by the rise time of the current in the coil L, the capacitor C will be charged and the grid potential is shifted towards negative voltages.

With a rapid reverse change in the grid voltage when it passes the critical value of egkrit,

the anode toch for a short period of time will tend to increase. This creates a negative voltage pulse in the anode and in the grid, on the termination of which the negative bias on the grid will be created only by the charge received during the positive pulse. The latter will drain through the resistance R, i.e. the process will start over.

The subject matter of the invention.

A device for generating sawtooth current pulses produced in the anode circuit of the lamp, characterized in that the coil L is connected to the anode circuit of the lamp, part of the turns of which is connected through a capacitor C to a grid circuit connected to the cathode with a resistance, , limited to the ignition of a glow lamp G. patent to a patent of a foreign company. Telefunken. Isle for infinite telegraphy with ogre. resp / .Ns 50246