SU450341A1 - Pulse modulator - Google Patents

Description

one

The invention relates to the field of pulsed technology and can be applied to pulsed feeding of microwave generators in accelerator technology and radar.

Pulse modulators are known that contain a first power source, the output terminals of which are connected to a chain of series-connected first switches and loads, first control key, circuit of series-connected switching capacitor and second control key, connected in parallel to the load, second power source, connected through the charging device to the switching capacitor, and a series circuit from the second cable and the diode.

In order to obtain output pulses that are close in shape to rectangular, in the proposed modulator, the first control key is connected parallel to the load, and a series circuit of the second cable and diode is connected between the tap of the first cable and the connection point of the storage capacitor with the second controlled key.

FIG. 1 is a schematic diagram of the proposed modulator; in fig. 2 - time diagrams.

The modulator contains the first power source 1, a circuit of series-connected first saver 2 and load 3, the first

a controllable key, for example, a thyristor 4, a series circuit from the second throttle 5 and a diode 6, the target from the series-connected switching capacitor 7 and the second

a controllable switch, for example, a thyristor 8, connected in parallel with the load 3, a second power source 9 connected through a charging device 10 to a capacitor 7.

A circuit of series-connected droplets 2 and load 3 is connected to the output terminals of source 1, and a series of droplets 5 and diode 6 is connected between the outlet of the chokes 2 and the connection point of the capacitor 7 with the thyristor 8.

The modulator operates as follows.

In the pause between the output pulses, the thyristor 4 is open, and the current in the inductor 2 increases due to the energy of source 1 (interval ti-12, Fig. 2, a). At the same time, the capacitor 7 is charged through the charging device 10 from source 9 (Fig. 2, b). At time 2, the thyristor 8 is turned on, and the voltage on the anode of the thyristor 4 becomes negative in the time-to-second interval, with the result that the thyristor 4 is turned off. The period of formation of the pulse front in the load begins. At the end of this period (moment 4), the voltage across the load 3 and the capacitor 7 reaches its maximum value. Charge current yes

the capacitor 7 is stopped and the thyristor 8 is turned off.

During the formation of the flat part of the output impulse (Fig. 2), two currents flow through the load 3: the discharge current of the throttle 2 and the discharge current of the capacitor 7 connected to the load 3 by the autotransformer connection through diode 6 and the correction throttle 5. The discharge current Yes throttle 2 in the interval has a falling character (Fig. 2, d, dashed line), and the discharge current of the capacitor 7 is increasing in character (Fig. 2, c). In load 3, these currents are added up; in a certain range of durations of the output pulse, the chipping of its tip decreases significantly (Fig. 2, d), and this is the effect of correcting the shape of the output pulse.

The subject invention Pulse modulator containing the first power source to the output terminals

which is connected a chain of serially connected first throttles and loads, a first control key, a circuit of serially connected switching capacitor and a second control key, connected in parallel with the load, a second power source connected via a charging device to the switching capacitor, and a series circuit of the second throttle and a diode, characterized in that, in order to obtain output pulses that are close in shape to a rectangular one, the first controlled key is connected in parallel with the load, and A series circuit of the second one and the diode is connected between the outlet of the first one and the connection point of the storage capacitor with the second control key.