SU875574A1 - Thyristorized device for control of high-voltage cathode-ray rectifier - Google Patents

Description

-. -. t

The device relates to electrical equipment, in particular, to high-speed high-voltage switches of the protection of sources of direct voltage from the load, high-frequency inverters voltage, high-voltage pulse modulators of radio-technical equipment.

A device for controlling an electronic device is known, comprising a power supply terminal, a main lamp switch, an HCTOWHOC from {zhitelnogo displacement, connected in series with a bypass lamp switch, which is controlled by a trigger {1.

However, the device has a low speed switched valve, the input circuit of which is an active-capacitive load, due to the influence of relatively large sliding capacitances and internal resistive switches, as well as low noise immunity due to the presence of a trigger.

The closest in technical connection to the present invention is a thyristor device for controlling a high-voltage electron-beam valve, which contains a power source connected through a current limiting element on the main thyristor to the control electrode of the valve, a circuit consisting of a series-connected auxiliary thyristor and a quenching capacitor, through which a negative resistor 2 is connected through a charging resistor.

The disadvantage of the device is low

10 reliability of the i-th due to the absence of a valve on the control electrode c. for a long time of negative voltage when the main and auxiliary thyristors are turned off, which is necessary when controlling high-voltage volt- age devices.

The purpose of the inventions is to increase the reliability of operation of the facilities.

To achieve this goal, a thyristor device for controlling a high-voltage electron-beam gate is provided with

Claims (2)

Twenty-four consecutive RC-chains,% SCHUI PACKAGE parallel to the bias source, and the common point of the RC-chain through the diode. The SCR is connected to the control electrode of the valve, the resistor is connected to the negative pole of the bias source, and the capacitor is connected to the positive pole. The drawing shows a schematic diagram of the proposed device. The device contains an electron-beam valve 1 connected to the load 2 and the same power source 3. The control electrode 4 of the valve is connected through the main thyristor 5, which is clamped by the oppositely connected diode 6, and the current-limiting element 7 is connected to the power supply 8. A circuit consisting of auxiliary thyristor 9 and quenching capacitor 10 is connected between the anode of the main thyristor and the minus bus of the power supply, to the common point of which, via the charging resistor 11, the negative bias source 12 is connected. Parallel to the bias source, a serial RC circuit consisting of a resistor 13 and a capacitor 14 is connected, the common point of which is connected through a diode 15, shunted by a resistor 16, to the control electrode of the valve and the cathode of the main thyristor. The device works as follows. In the initial state, the thyristors 5 and 9 are closed, the negative bias voltage of the source 12 is applied to the control electrode 4 of the valve through resistors 13 and 16. The parasitic input capacitance of the valve is also charged before the same voltage. The extinguishing capacitor 10 is charged until the full negative voltage U of source 12. To unlock the valve, a control pulse is applied to the thyristor 5. The voltage of source 8 accelerates the parasitic input capacitance of the valve and it quickly opens, forming a high front voltage on load 2 tension When the thyristor 5 is open and valve 1, respectively, the resistors 13 and 16 form a voltage divider connected to the source circuit 8 and 12. The ratio of these resistors is chosen so that the voltage U2 of the capacitor 14 is negative and the ratio / 1 is satisfied) The locking of the valve 1 is released by switching on the auxiliary thyristor 9. At this moment, the negative voltage from the capacitor 10 is applied to the anode of the thyristor 5, which is possible due to the presence of a current-limiting element 7 pogo can be used resistor, choke, etc. Through the diodes 15 and 6 and the thyristor 9 flows the current created by the difference. voltages 44 and and and 2: respectively, the capacitors 10 and 14 UU U -U2K, the reverse voltage is applied to the thyristor 5 and it is locked. The value of & U is selected based on the condition of reliable locking of the thyristor 5. Simultaneously along the low-resistance circuit (diode 6, thyristor 9, coneser 10), a forced recharge of the parasitic input capacitance of the valve occurs, which contributes to its fast locking, the capacitor 10 begins to recharge from source 8 , the magnitude of the negative voltage across it begins to decrease and, when the value reaches 0, diode 6 is closed. The bias voltage to the control electrode of the valve from source 12 begins to be supplied through resistor 16. After the recharging of the capacitor 10 is over to the voltage of source 8, the thyristor 9 is locked and the capacitor 10 begins to recharge again, but already from source 12 through resistor 11. thyristor 5 is possible after turning off the thyristor 9. The proposed thyristor control device provides quick switching of electronic valves, which increases the efficiency of their use, for example, in high-voltage interrupters x dc to protect those responsible. consumers, in high-voltage pulse modulators of radio engineering devices and high-frequency voltage inverters. The claims of a thyristor device for controlling a high-voltage electron-beam valve, containing a power source connected through a current limiting element and a main thyristor, to the control electrode of the valve, a shunt circuit consisting of a series-connected auxiliary thyristor and a quenching capacitor, which in parallel is connected via a charging resistor the source of negative bias, due to the fact that, in order to increase its reliability, it is equipped with a serial RC-chain, under for prison parallel bias source, wherein the total RC-dot chain through the diode shunt rezisorom is connected to the control electrode entil, a resistor connected to the pole otritsatelnou bias source and kondensaor - to the positive pole. Source of information. taken into account in the examination, 1. Swedish Patent No. 117120, cl. 21 d P2 / 03, 1943. 2. USSR author's certificate N 481964, l. H 02 H 7/10, 1974.