RU2624098C1 - Pulse transmitter modulator - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: modulator of the impulse transmitter contains a control pulse generator connected to the primary winding of the pulse transformer in parallel with which a termination resistor is connected, the first terminal of the secondary winding of the pulse transformer through the antiparasitic resistor is connected to the control grid of the microwave device and the second terminal of the secondary winding with a negative output of the bias source and the first output of the storage capacitor, the second terminal of which is connected to the positive terminal of the bias source, microwave device cathode and the negative terminal of the collector voltage source, the positive terminal of which is grounded and connected to the collector of the microwave device.

EFFECT: simplifying the device and increasing the reliability thereof.

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Description

The invention relates to a pulse technique and can be used to build modulators of pulse transmitters and electrophysical devices using microwave devices with grid control (Klystrons, TWT, VOC, etc.).

Known pulse modulators operating as part of transmitters built using microwave devices with grid control, such devices include a modulator described in the description of patent 2034400 C1 [1].

The device contains a control pulse generator, first and second modulator lamps, which are tetrodes, first and second parallel RC circuits, first and second electronic switches made on npn type transistors, two second capacitors, two first amplifiers, two transistor switches, two first sources power supply, two second power sources, two second resistors, two diodes, two integrating circuits, load, differentiating circuit, second amplifier, transformer, additional load, two third capacitors and two three ih resistor, forming two parallel RC-circuit, two first capacitor and the first two resistors forming the two integrating circuits, a fourth capacitor and a resistor constituting a differentiating circuit (FIG. 1).

The disadvantage of this device is the presence of two electronic keys (first and second modulator lamps), a complex key management scheme containing transistor and operational amplifiers, as well as four power sources, which reduces its reliability.

More sophisticated are transmitters with modulators based on powerful MOSFET transistors that form two key devices, a key that closes the microwave device connected to the bias source, and a key that opens to the excess source. (Fig. 2) [2]

Each of these two key devices consists of several series-connected transistors, the number of which depends on the voltage switched by them.

The disadvantage of this type of modulators (Fig. 2) is the presence of two switches, which in turn have such a disadvantage as uneven voltage distribution along a series of transistors connected in series, which reduces the reliability of the device, as well as the presence of stray capacitances. In addition, the modulator has a complex transistor switch control circuit, which further reduces its reliability.

A common disadvantage of the known devices is the relatively low reliability due to the large number of constituent elements and high cost due to the use of expensive components, such as MOSFET transistors, generator electronic devices, operational amplifiers.

The aim of the invention is to simplify the modulator of a pulse transmitter, increase its reliability and reduce cost.

This goal is achieved by eliminating key devices by directly connecting a pulse transformer to the control grid of the microwave device, to which a positive opening pulse is applied, which suppresses the negative, closing microwave device, bias voltage.

This method of controlling microwave devices is authorized due to the low power consumed by their grids, which is typical for most microwave devices with grid control.

In FIG. 3 presents a structural diagram of the proposed modulator of a pulse transmitter.

The pulse transmitter modulator contains a control pulse generator (GUI) 1, a matching resistor 2, a pulse transformer 3, an antiparasitic resistor 4, a microwave device 5, a bias source 6, a storage capacitor 7, a collector voltage source 8.

The first output of the GUI 1 is connected to the first output of the matching resistor 2, the second output of which is connected to the second output of the GUI 1, the first output of the matching resistor 2 connected to the first output (1) of the primary winding of the pulse transformer 3, and the second output to the second output (2 ) pulse transformer 3; the first terminal (3) of the secondary winding of the pulse transformer 3 through an antiparasitic resistor 4 is connected to the control grid of the microwave device 5, the second terminal (4) of the secondary winding of the pulse transformer 3 is connected to the negative terminal of the bias source 6 and to the first terminal of the storage capacitor 7, the second terminal which is connected to the positive terminal of the bias source 6, the cathode of the microwave device 5 and the negative terminal of the collector voltage source 8, the positive terminal of which is grounded and connected to the collector of the microwave device 5.

The modulator of the pulse transmitter operates as follows. When applying the control pulses of the required magnitude and duty cycle produced by the GUI 1 to the primary winding of the pulse transformer 3, the positive pulses generated in its secondary winding exceeding the voltage of the bias source 6 are fed to the control grid of the microwave device 5, through the resistor 4, opening the microwave instrument 5. In this case, the secondary winding of the pulse transformer 3, the bias source 6, and the storage capacitor 7, providing pulse and pulse-code modes of operation of the pulse transmitter modulator, find are under the potential of the collector power source of the microwave device 8.

The advantages of the proposed pulse transmitter modulator are a significant reduction in the elements constituting the pulse transmitter modulator. Considering that all elements of the pulse transmitter modulator, when grid-controlled by microwave devices, are under the voltage of the collector voltage source, for the implementation of the modulator, for example, FIG. 1, high-potential glow transformers of generator (modulator) lamps, power supplies and other elements that are complex and time-consuming to manufacture will be required. At the same time, transistors, operational amplifiers, and other elements that are under high voltage (from 10 kV and above) are excluded, which, due to inevitable leaks, can not work reliably.

Thus, due to the exclusion of expensive, operating under high voltage, reliability is significantly increased, the complexity and cost of the proposed device is reduced.

The operability of the proposed pulse transmitter modulator was tested on a prototype at a pulse duration of 2 μs and a frequency of 2000 Hz, as applied to the parameters of the KIU-234 high-power amplifying klystron.

Literature

1. Pulse modulator. Rostovtsev V.I., Tachkov N.I., Chukov P.N., Poltoratsky B.F. Patent for invention No. 2034400 C1.

2. High voltage pulse modulators. Kazantsev V.I., Sergeev V.G., Platonov S.A. "Science and Education" 11/11/2011, MSTU. Bauman, Moscow.

Claims (1)

A pulse transmitter modulator comprising a grid-controlled microwave device, a control pulse generator connected to a primary winding of a pulse transformer, in parallel with which a terminating resistor, a bias source, a storage capacitor and a collector voltage source are included, characterized in that in order to simplify and increase it of reliability, the first output of the secondary winding of the pulse transformer through an antiparasitic resistor is connected to the control grid of the microwave device, and the second output of the pulse the transformer is connected to the negative terminal of the bias source shunted by the storage capacitor, and the positive terminal of the bias source is connected to the cathode of the microwave device, and the negative terminal of the collector voltage source, the positive terminal of which is grounded and connected to the collector of the microwave device.

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