SU493012A1 - Pulse modulator - Google Patents

Description

one

This invention relates to radio engineering and can be used to charge capacitive storage from direct current sources.

A pulsed modulator containing a source of direct current, a generator of trigger pulses, a ballast capacitor, a charging circuit including a primary winding of a charging droplet, and a key element, the cathode of which is connected to the input of the accumulator, are known. a HarpJfSKy cut with a zero modulator modulator, the serially connected drive and load are shunted by a discharge key element and connected between the drive input and a zero resistor divider width of the modulator, to the midpoint of which the input of the comparator device is connected, the output of which is connected to the control electrode of the key element the auxiliary charge circuit of the ballast capacitor connected in parallel with this capacitor and containing a series connected key element and secondary circuit whence charging choke included in the cathode circuit of the key element.

The purpose of the invention is to increase the reliability of the device as a result of a decrease in the voltage on the elements of the charging circuit.

For this, the ballast capacitor is connected between the positive pole of the direct current source and the primary winding of the charge throttle and is shunted by a diode, connected in the conductive direction for the storage charge current, and the control electrode of the charge key element is connected to the output of the trigger pulse generator.

In the drawing, an electrical circuit diagram of a pulse modulator is given.

The pulse modulator contains a source of direct current 1, a generator of triggering pulses (not shown), a ballast capacitor 2, a doubled circuit including a primary winding 3 of charge throttle 4 and a key element 5, the cathode of which is connected to the input of the accumulator 6, connected via a PCR) to a narrow 7 with a zero bus of the device, with the successively connected drive 6 and load 7 being shunted by a discharge element 8 and connected by a resistive divider between the input of the drive 6 and the zero bus of the modulator resistors 9 and 1O, to the midpoint of which the input of the comparator device 11 is connected, the output of which is connected to the control electrode of the key element 12 of the auxiliary charging circuit of the ballast capacitor 2. The auxiliary charging circuit of the ballast capacitor 2 consists of the key element 12 and the secondary winding 13 of the charging The secondary throttle 4 .. The secondary winding 13 charge throttle 4 is included in the cathode circuit of the key element 12.

The ballast capacitor 2 is connected between the positive pole of the source 1 and the primary winding 3 of the charge choke 4 and is bridged by a diode 14 connected in the leading direction for the charge current of the storage ring 6. The control charge electrode

Key element 5 is connected to the output of the trigger pulse generator.

Pulse modulator works as follows.

The first triggering pulse in a series of three pulses includes a charge key element 5. From a source of direct current 1, connected in series with a pre-charged capacitor 2, through the primary winding 3 of charge throttle 4 and key element 5, drive 6 begins to charge. in this case, it is discharged and does not affect the charge of the storage device 6, since the diode 14 opens.

The voltage, which coincides in shape with the charge curve of the accumulator 6, but reduced in magnitude, is supplied from the midpoint of the divider on the resistors 9 and 10 to the comparator device 11, which produces positive polarity pulses | these pulses are the second in a series of trigger pulses). When a positive impulse is supplied from the device 11 to the control electrode, the key element 12 is started and switches on the secondary winding 13 of the charge throttle 4 to the capacitor 2.

The current passing through the key element 5 decreases sharply, and

item 5 is turned off. The bottom of the accumulator circuit 6 is cut off, and the voltage amplitude is at a predetermined level.

The third trigger pulse is applied to the control electrode of the discharge key element 8 and the accumulator 6 is discharged t to the load 7. At the same time, the excess energy stored in the inductor 4 ensures that the capacitor 2 is energized. A diode 14 in the process of charging the capacitor 2 does not perform discharge

At the end of the discharge, the accumulator 6 remains uncharged until a new key element 5 is turned on with the first I pulse of the next series of three triggering pulses, after which the duty cycle repeats,

Subject invention

A pulse modulator containing a DC source, a trigger pulse generator, a ballast capacitor, a charging circuit including a primary winding of a charging droplet, and a key element whose cathode is connected to the INPUT of a drive connected through a load with a zero modulator, which are connected in series the accumulator and the load are bypassed with a discharge key element and a resistive divider connected between the input of the accumulator and the zero bus of the modulator, to the midpoint of which the input is connected Comparison device, the output of which is connected to the control electrode of the key element of the auxiliary charge circuit of the ballast capacitor connected in parallel to this codensor and containing the key element connected in series and the secondary winding of the charge choke, connected to the cathode circuit of this key element, and in order to increase the reliability of the modulator as a result of lowering the voltage on the elements of the charge circuit, the ballast capacitor is connected between the positive pole A DC current source and the primary winding of the charge droplet are shunted by a diode connected in the conductive direction for the storage charge current, and the control electrode of the charging key element is connected to the output of the trigger pulse generator.