SU884069A1 - Cathode-ray gating circuit control device - Google Patents

Description

(54) DEVICE FOR CONTROLLING ELECTRONSERVOUS VALVES The invention relates to electrical engineering, in particular, to high-speed direct current switches for modulators and high-frequency voltage inverters. A device for controlling an electronic valve, comprising a power source, a main lamp switch and a source of negative bias, connected in series with a lamp key switch ij, is known. The disadvantage of this device is that the switching speed of the electronic valve is low, due to the influence of relatively large passage capacitances and internal resistances of the lamp switches, and also due to the absence of the possibility of forcing transients. The presence of lamp switches also reduces the reliability of the device. A thyristor DC switch is known, consisting of a main thyristor connected in series with a source, a disconnecting thyristor connected in series with the choke and a quenching capacitor, and auxiliary thyristor and an additional choke 2 are connected parallel to the capacitor loads due to the presence of throttles in the shunt circuit and a long preparation time for re-activation. . The closest in technical essence and the achieved result, the invention is a device for controlling an electron-beam valve, containing a power source connected to the cathode of the valve and to the input of a current-limiting unit, a thyristor, shunted by a counter-switched diode and connected by a cathode to the control electrode of the valve a shunt circuit consisting of a series-connected switching thyristor and a quenching capacitor, the source is negative; . shunt capacitor, connected through a resistor to a control to the valve electrode, an auxiliary circuit consisting of a series-connected throttle and auxiliary thyristor and connected by one output to a common point of the switching thyristor and the suppressor capacitor. Capacitive load is a large load disconnection time due to the absence of forced reloading of the input parasitic capacitance of the valve in transient conditions. The aim of the invention is to increase speed. This goal is achieved by the fact that the device for controlling an electronic-yuch valve is equipped with an additional diode and a capacitor, a diverter and the secondary winding of the chokes, the auxiliary circuit with a different output connected to the negative bus of the bias source, and the secondary winding of the connecting harness is connected to the top A customer whose output is enclosed with an additional capacitor and plug. P.LUSOM to the thyristor anode, and minus through the auxiliary thyristor to the cathode of the valve and to the positive source of the negative bias, and between the anode of the thyristor and the other input of the current-limiting unit an additional diode is connected according to the conductivity of the thyristor.

The drawing shows a schematic diagram of the proposed device.

The device contains an electron-beam valve 1, the control electrode 2 of which through the thyristor 3, shunted by the oppositely connected diodes 4, the additional diode 5 and the current-limiting unit 6 is connected to the power source 7. Between the anode of the thyristor 3 and the negative busbar of the source 7 a shunt circuit from series-connected switching thyristor 8 and extinguishing capacitor 9, to the common point of which through the auxiliary thyristor 10 and choke 11. a source of negative bias 12 and a storage capacitor 13 are connected. Source 12 through resistor 14 is also connected to the control gate electrode 2 1. By the secondary winding of choke 11 is connected a rectifier 15, whose output is shunted konden86

Since the current flow through the valve is determined by the voltage on the control electrode, the surge control voltage in turn provides a surge in the valve iodine current, which leads to an exacerbation of the leading edge of the voltage on the load in the event of its capacitive nature. After discharge of the capacitor 16 to the voltage of the source 7, the thyristor 17 is locked, the diode 5 is unlocked and the valve is controlled from the nominal positive voltage (4-8 kV) of the source 7. The initial moment on the capacitor 16 is higher than the nominal source value

7 at a time with a decrease in valve turn-on time, excludes the effect of the current-limiting block 6 on the transition process.

The valve 1 is turned off by switching on the switching thyristor 8. At this moment, the negative voltage of the capacitor 9 is applied to the anode of the thyristor 3, which is possible due to the presence of the current-limiting unit 6, and it is locked.

Claims (3)

In the quality of block 6, a resistor or an instantaneous diode-offset circuit can be used. The closed thyristor 17 prevents the recharging of the capacitor 16 from the voltage of the capacitor 9 through the thyristor 8, which also contributes to the aggravation of the rear 94 by the capacitor 16 and is connected to the thyristor 3 anode plus and minus through the additional thyristor 17 to the cathode of valve 1. The device works as follows. In the initial state, the thyristors 3, 8, 10, and 17 are closed. A control resistor 14 is applied to the control electrode 2 of the valve through a high resistance resistor 14 and a negative voltage of 2–4 kV to the source 12, to which the parasitic capacitance of the valve is also charged. The extinguishing capacitor 9 is charged to a negative voltage, the capacitor 16 to a positive voltage. Moreover, the values of these voltages exceed the voltages of the respective sources 12 and 7. To unlock the electron-beam valve I, pulses are supplied to the control electrodes of thyristors 3 and 17. The voltage of the capacitor 16 accelerates the parasitic input capacitance of the valve and it is unlocked forcibly. Since the front of the pulse. The parasitic input capacitance of the valve, charged to a positive voltage, quickly reloads to the negative voltage of capacitor 9 along the circuit: control electrode 2, diode 4, thyristor 8, capacitor 9 and cathode of valve 1. In the further closed state, the valve is maintained through a resistor 14 by a bias source 12, which has a low power determined by the leakage current of the input circuit of the valve. After unlocking the thyristor 8, the condenser 9 starts recharging from the source 7. When the positive voltage of the source 7 on the capacitor 9 is reached, the thyristor is 8-locked. Through the time interval determined by the recovery time of the closing capacity of the thyristor 8, a pulse is applied to unlock the auxiliary thyristor 10. The capacitor 9 along the circuit: the thyristor 10, the inductor II, the capacitor 13 begins to recharge with a half-wave current to a negative voltage, the value of which exceeds the voltage of the source 12. The voltage across the hot winding of the choke 11 is equal to the derivative of the oscillating circuit current at the input of the rectifier 15. The rectified peak voltage charges the capacitor 16. The number of turns orichnoy choke coil is selected so that the voltage across the capacitor 16 to be higher than the voltage source 7 (obyno a half to two per pa). Diode 5 cuts off capacitor 16 from Source 7. Replacing capacitor 9 with thyristor 10 accelerates the preparation of the device for the next operating cycle. Exceeding the voltage on capacitors 16 and 9 with respect to the voltages of the respective sources 7 and 12 contributes to sharpening the front and trailing edges of the pulse at the entrance of the ventil. The proposed control unit increases the speed of switching blocks, which are made on the basis of electron-beam valves, which makes it possible to increase the efficiency of their use in high-voltage pulse 9 modulators and high-frequency voltage inverters. Claims An apparatus for controlling a cathode ray valve comprising a power source connected to the cathode of the valve and to the input of a current-limiting unit, a thyristor shunted by a counter-activated diode and connected by a cathode to the control electrically | shunt at valve i; a circuit consisting of a series-connected switching thyristor and an gab capacitor, a source of negative bias, a capacitor bridged by capacitor, connected through a resistor to the control electrode of the valve, an auxiliary circuit consisting of a series-connected droplet and an auxiliary thyristor and connected to one common to the common the point of the switching thyristor and the suppressing capacitor, which is different in that, in order to increase speed, it is supplied with an additional diode and capacitor The secondary switch and the secondary winding of the drossel, the auxiliary circuit with another output connected to the minus bus of the negative bias source, the secondary winding of the throttle connected to the rectifier, the output of which is shunted by an additional capacitor, and connected to the thyristor anode plus and minus through the triac thyristor to the thyristor, and minus through the triac thyristor to the thyristor, plus minus via an anode thyristor, and minus through the trigger thyristor to a thyristor, and a minus through the triac thyristor, and a minus through the thyristor anode, and minus through the trigger thyristor to the thyristor, and minus through the triac thyristor to the thyristor, and minus through the anode thyristor, and minus through the trigger, the secondary thyristor is connected to the thyristor anode and a minus circuit is connected to the rectifier. and to the plus of the source of negative bias, and between the anode of the thyristor and the other input of the current-limiting unit an additional diode is connected according to the conductivity of the thyristor. Sources of information taken into account in the examination 1. Swedish patent H 117120, cl. H 03 K 17/74, 1943. 2. The patent Czechoslovakia 148114, cl, H 03 K 17/74, 1973, 3. Thyristor switch of direct current, 1973, А 94, № 9 539542, 35, 36.