SU797062A1 - Pulse modulator - Google Patents

Description

The invention relates to a pulse technique and can be used for pulse modulation of microwave generators in both pulse-code and pulse modes with a high frequency. A pulse modulator is known that contains a series-connected power source, two throttles, an uncontrolled valve, an energy accumulator and a load, a switching element connected between the input of the energy accumulator and a common bus, a controlled valve that shunts the second choke and the delay device, including between the control electrodes of the switching element and the controlled fan. A disadvantage of the known pulse modulator is the limitation of the maximum charge rate of the forming line due to and the process of charging the load connected in series with the forming line. Also known is a pulse module containing a power source to which a series-connected choke is connected with an auxiliary winding connected in antiphase to a charging diode forming a line and the primary winding of a pulse transformer to which the secondary winding of the load is connected, the thyratron switch connected between the input of the forming line and the common bus and the generator of control pulses, the first input of which is connected to the control electrode of the thyratron switch 2. The disadvantage is pulse modulator consists in low pulse frequency and low reliability due to the fact that in the presence of a pulse transformer connected between the forming line output and the load, its inductance ng1 magnetization significantly reduces the charge rate of the line forming and at a sufficiently high forming line charge rate A reverse voltage of significant magnitude appears on the load, which negatively affects the operation of the microwave generator. The purpose of the invention is to increase the pulse frequency by reducing the charge time of the forming line and increase reliability. The last goal is achieved by the fact that a pulse modulator containing a power source to which a series-connected choke is connected with an additional winding connected in antiphase, a charge diode, a line forming and a primary winding of the pulse transformer, to the secondary winding of which a load is connected, a thyratron switch connected between the input of the forming line and the common bus., and a generator of control pulses, the first output of which is connected, to the control electrode of the thyratron a switch, a controlled valve and a diode are inserted, the diode being connected in the forward direction between the forming line output and the common bus, the additional charging winding is shunted by the controlled valve, the cathode of which is connected to the common bus, and the control electrode is connected to the second output of the control pulse generator.

FIG. 1 shows a functional diagram of the proposed pulse modulator; in fig. 2 shows voltage and current plots in a pulse modulator circuit.

The positive pole of the power supply source 1 is connected via a charging choke 2 with an additional winding and charging diode 3 with the forming line 4 and the anode of the thyratron switch 5, the output of the forming line 4 is connected to the primary winding of the pulse transformer b and the cathode of the diode 7 shunting the primary winding transformer b, the secondary winding of which is connected to the load 8, the negative pole of the power supply source 1, the cathode of the thyratron switch 5 and the anode of the diode 7 are connected to the common bus of the modulator, the additional charge winding ossel 2 included in antiphase with respect to its main winding shunted controllable valve 9, the cathode of which is connected to a common bus, and a control electrode of the second output control pulses of the generator 10, the first output of which is connected to the control electrode of the thyratron 5.

FIG. Figure 2 shows the plot 11 form of voltage on the forming line 4; plot 12 — current form in the charge circuit of the modulator plot. 13 — ignition pulses of the thyratron 5; plot 14 - valve start-up impulses 9.

The principle of operation of a pulse modulator is as follows.

By the time of arrival of the ignition pulse to the control unit, the electrode of the thyratron switch 5, the forming line 4 is charged to nominal voltage, the controlled valve 9 is in the closed state. Under the influence of an ignition pulse, the thyratron switch 5 opens and the forming line 4 is discharged to the load 8.

through the matching shushulny transformer 6. When the forming line 4 is discharged, the inductance of charge throttle 2 is sufficiently large and the source of power from 1 of the thyratron switch 5 is discharged by the time of formation of a pulse of load 8, -t. e. the maximum possible reduction of the tick from the source 1 through the thyratron 5 is achieved. After the discharge of the forming line 4 to the load 8 is completed, the process of its charging along the circuit begins: the positive pole of the power source 1, the charging choke 2, the charging diode 3, diode 7, negative

5 pole of the source 1. It is known that during resonant charge growth, for example, -. Acting on the formative takes place according to the law

if. & 0-COStDot),.

and

- Voltage on form

fl

common line; E - source voltage

nutrition;

, is the circular frequency of charge of the Lo-vLtjCV circuit,

Sfd - total capacity of the forming line 4; L1 -. Inductance of charge

Drossel 2.

At the time t-t equal to the time for restoring the electrical strength / thyratron switch 5, the voltage amplitude on the forming line 4 (plot 11) is insignificant and the thyratron switch 5 goes to the closed state. At this moment, from the generator 10 control pulses to the control electrode of the valve 9 (plot 14), a triggering pulse arrives. The controlled valve 9 opens and shunts the additional winding of the charge throttle 2. When the additional winding is closed, the inductance value of the charge throttle 2 sharply decreases, and so many times as many times the effective magnetic permeability of the charge throttle 2 is greater than the air permeability. At the same time, the natural frequency of the charging circuit 0 increases sharply and the forming line 4 is charged to its nominal value at the instant of time

   rcVC

.

one,

-but.

5 where bjv

- inductance of charge throttle 2 with closed

additional winding. At the time ti, the current in the charging circuit (plot 12) and the voltage, 0, induced on the additional winding of the throttle 2, become zero. At this moment the controlled valve 9 is closed, the additional winding of the charge throttle 2 is opened and the inductance of the charge

Claims (1)

Claim A pulse modulator containing a power source, to which a charge choke is connected in series with an additional winding included in antiphase, a charging diode, a forming line and a primary, a pulse transformer winding, a load is connected to the secondary winding, a dash switch connected between the input of the forming line and a common bus, and a control pulse generator, the first output of which is connected to the control electrode of the thyratron switch, characterized in that, in order to of the pulse repetition rate j by decreasing the charge time of the forming line and increasing reliability, a controlled valve and diode are introduced into it, the diode being connected in the forward direction between the output of the forming line and the common bus, the additional winding of the charging inductor is shunted by the controlled valve, the cathode of which is connected to , the common bus, and the control electrode to the second output of the generator of control pulses.