SU362431A1 - DEVICE FOR RUNNING THE MODULATOR - Google Patents

Description

one

The invention can be used in electronic systems in which modulators are used to create high voltage pulsed voltages.

The power sources of the modulators, as a rule, are high voltage rectifiers. When synchronizing pulses do not reach the modulator, the rectifier idling occurs. At the same time, the voltage applied to the elements of the rectifier and the modulator of the torus (the no-load voltage) increases significantly.

In the known devices for starting the modulator, in order to reduce the no-load voltage, the time lag between the moments of the no-load operation and the switching off of the rectifier from the primary power source is reduced. However, the idle voltage setting time is comparable to the response time of the protection systems, and therefore in existing devices the idle speed is much higher than the operating voltage.

In order to reduce the no-load voltage of the anode voltage source of the modulator, in the described device between the bias source and the grid of the blocking-generator lamp, a protective device is switched on, which contains the timing circuit, the discharge resistor and the relay. Winding this relay

connected in parallel with the winding of the contactor turn on the source of the anode voltage of the modulator. The drawing shows a diagram of the device.

The device contains a blocking generator consisting of a lamp /, an I1-pulse transformer 2, a master circuit time (resistor 3, capacitor 4) and a forming circuit of resistors 5 and a capacitor 6; a discharge resistor 7 and a relay 8, the winding of which is connected in parallel with the winding of the contactor (relay) 9 of turning on the anode voltage source of the modulator. If there are synchronizing pulses 10 and the anode voltage of the relay 8 is turned on, it is attracted. Capacitor 4 through closed contact springs //, 12 and resistor 7 bit. In the absence of sync pulses (idle state), the voltage is turned off from the contactor, relay 8 releases. Contact springs 12 and 13 are closed. Since capacitor 4 is discharged, the voltage at point 14, and therefore on the grid of the lamp, becomes almost zero. As the capacitor 4 is charged, the voltage at point 14 approaches the value that existed before the capacitor was connected. As long as the voltage on the capacitor is less than the lamp cut-off voltage, the blocking generator

works in self-oscillating mode.

Thus, the blocking generator transmits a packet of pulses to the modulator, and the corresponding pulse packet of the modulator discharges the filter capacitors of the rectifier and the storage capacitors of the modulator.

The magnitude of the decrease in the no-load voltage depends on the number of pulses in a pack and on the decrease in voltage per pulse. The number of pulses in a pack depends on the frequency of their repetition and the duration of the pack. The decrease in voltage per pulse is derived from the properties of the modulator and the load.

Based on the foregoing findings, the parameters of the timing of the master circuit can be determined.

Subject invention

A device for starting a modulator containing a waiting blocking generator, source

bias and contactor (relay) turn on the source of anode voltage of the modulator ,. characterized in that, in order to reduce the no-load voltage of the anode voltage source of the modulator, a protective device consisting of a driver circuit, a discharge resistor and a relay is connected between the bias source and the grid of the blocking-generator lamp, and the relay winding connected in parallel with the winding of the contactor turn on the source of the anode voltage of the modulator.

for example

/ R source anode

Hanp H eHUfi

2 To the next With cascades

Mijffy flmoflu

CJ