SU394926A1 - GENERATOR RECTANGULAR PULSES - Google Patents

Description

one

The invention relates to automation and can be used as a generator of rectangular anti-infrared frequency with a sinusoidal current.

A known generator of rectangular pulses contains a thyratron, in the anode circuit of which a transformer is connected and the time specifying a C-circuit consisting of a valve, a capacitor, a charging and discharge reznstorov.

However, the known generator has a low stability and does not provide independent control of the duration and pause.

In order to ensure the independence of the control of the pulse duration and pause and increase the stability of the pulse frequency in the proposed generator, the capacitor of the KC circuit is connected to the grid of the thyratron through a constant current source formed by the secondary winding of the transformer and the synchronizer, and the discharge resistor and through the charging resistor and The valve is connected to a voltage divider formed by a resistor ' photoresistor optically coupled to the thyratron.

FIG. 1 shows the basic electrical circuit of the proposed generator; in fig. 2 is a diagram of voltages at various points of the circuit.

The pulse generator contains a cold cathode thyratron 1, in the anode circuit of which t is included | asformator 2, and time specifying the C-coitur, consisting of capacitor 5, charging resistor 4, discharge resistor 5, branch (diode) 6. Capacitor 3 is connected to the grid of the thyratron / through a DC source formed by the secondary winding 7 of the transformer 2 and a rectifier containing diode 5, resistor 9 is capacitor 0, and through charging resistor 4 and diode 6 to a voltage divider formed by resistor} 1 and photoresistor 12. In addition, the generator includes capacitors 13 and 14 , diodes 15 and 16, resistor 17. The generator output is a winding and 18 transformer 2.

The generator works as follows.

When turned on, the network starts charging the capacitor 3 through the resistor 4 with the voltage EI falling on the started photoresistor 12. When the capacitor 3 is charged before the ignition voltage of the thyratron / (across the grid-cathode gap), the thyratron is ignited and through it the load (primary winding 19 of the transformer 2) pulsating current will flow. In this case, a variable component of the pulsating current is released on the resonant circuit formed by the primary winding 19 of the transformer 2 and the capacitor 14.

transformable into secondary windings. The capacitor 3 begins to discharge the resistor 5 and the DC source formed by the secondary winding 7 of the transformer 2, the diode 8 and the capacitor 10 to the grid-cathode of the thyratron /, maintaining it in a hot state in the pauses between the pulse-pulsed rectifier current. Capacitor 3 discharges to voltage.

and, and, -E ,,

where t / ,. - voltage of quenching of tiratron 1, EZ - voltage of the power source formed by the secondary winding 7 of transformer 2, diode 8 and capacitor 10. When the voltage on capacitor 3 reaches U, the thyratron 1 goes out in dips between rectified current pulses and voltage The life on the winding 18 of transformer 2 disappears.

FIG. 2 shows the voltage change patterns on the capacitor 3 and the output winding 18 of the transformer 2. The capacitor 3. is charged until the ignition voltage of the thyratron / (i) and then discharged to the voltage and. and,. -EZ The charge time of capacitor 3 determines the pulse duration (i), and the charge time determines the duration

((2).

To eliminate the charge, the capacitor 3 is connected to the divider of the voltage, formed by the resistor 11 and the photoresistor 12, which has an optical connection to the thyratron /. Therefore, when the thyratron is ignited / the resistance of the photoresistor 12 decreases sharply, therefore, the voltage drop decreases on it, and the charge of the capacitor 3 stops. To eliminate the discharge of the capacitor 3, a diode 6 is mounted on the photoresistor 12 in the circuit, which is underestimated when the thyratron 1 is ignited.

Thus, the introduction of a negative light feedback eliminates the charge of the Capacitor 3 when it is discharged.

The duration of the pulse pause is determined by the time constant of the circuit, consisting of its capacitor 3 and resistor 4, the voltage EI of its supply and the ignition voltage of the thyratron ii. Pulse duration

is determined by the time constant of a circuit consisting of a capacitor 3 and a resistor 5, voltages 2 and g of the invention

A square pulse generator containing a thyratron, in the anode circuit of which a transformer is connected and an RC driving circuit time, which consists of a valve, a capacitor, a charging and discharge resistors, characterized in that, in order to ensure independence of impulse control duration and pause and increase the stability of the frequency of the pulses, the capacitor

The C-circuit is connected to the tiratroia grid via a DC source formed by the secondary winding of the transformer and the rectifier and the discharge resistor, and through a charging resistor and valve connected to a voltage divider formed by a resistor and a photoresistor coupled to the thyratron.

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Phage 2