SU907721A1 - Device for control of cathode-ray rectifier - Google Patents

Description

(54) DEVICE FOR CONTROLLING ELECTRON-RAY VENT

one

The device relates to electrical engineering and can be used in high-speed DC switches, modulators and high-frequency voltage inverters.

A device for controlling an electronic device is known, comprising a power source, a main lamp switch and a source of negative bias, connected in series with a bypass lamp switch 1.

The disadvantage of this device is the low switching speed of the electronic device due to the influence of relatively large feed capacities and internal resistances of the lamp switches, as well as due to the lack of the possibility of forcing transients. The presence of lamp keys also reduces the reliability of the device.

A thyristor DC switch is known, which consists of a main thyristor connected in series with a source, a disconnecting thyristor connected in series with a choke and a quenching capacitor. Auxiliary thyristor and an additional choke 2 are connected in parallel with the capacitor.

The disadvantage of the device is a large time off load and prepare it to re-enable.

The closest technical solution to the invention is a device for controlling an electron-beam valve, containing a power source connected in series with a current limiting unit and a main thyristor, ground by an oppositely connected diode and connected to the leads for connecting an operating beam to the control electrode, shunt circuit consisting of a series-connected switching thyristor and a quenching capacitor connected between the anode of the main thyristor and the source -negative bias via resistors 20 connected to the terminal for connection to the control gate electrode and the common point of the switching thyristor and the capacitor 3.

Claims (3)

A disadvantage of the known device is the longer duration of the leading edge of the voltage on the ohmic-capacitive load characteristic of the input circuit of electronic gates. The purpose of the invention is to increase the speed when the electron-beam valves are turned on and off. This goal is achieved by the fact that the device for controlling the electron-beam valve is equipped with a chain consisting of a series-connected thyristor, shunted by a counter-connected diode, and a capacitor connected in parallel with the above-mentioned shunt circuit, between the current limiting unit and the negative power supply bus. The drawing shows a diagram of the proposed device. The device contains an electron-beam valve 1, the control electrode 2 of which through the main thyristor 3, shunted by the oppositely connected diode 4, and the current-limiting unit 5, is connected to the power supply 6. Two parallel circuits are connected between the anode of the thyristor 3 and the minus bus of the power supply, one of which consists of a series-connected switching thyristor 7 and a quenching capacitor 8, and the other of a series-connected thyristor 9, which is shunted by a counter diode 10 and a capacitor. 11. The common point of the thyristor 7 and the capacitor 8 is connected via a resistor 12 to a negative bias source 13, which is also connected to a control electrode 2 of a valve 1 through a resistor 14. If necessary, inductance can be connected in series with thyristor -9 to reduce thyristors 3 and 9 . Instead of thyristors 3, 7 and 9, controlled valves of another type, such as thyratrons, can be used. The device works as follows. In the initial state, when the thyristors 3 7 and 9 are closed, the locking voltage of the source 13 is applied to the control electrode of the valve through the high resistance resistor 14. The capacitor 8 is charged to the negative voltage of the source 13, and the capacitor 11 to the positive voltage of the source 6. To unlock the electron-beam valve 1, pulses are simultaneously applied to the control electrodes of thyristors 3 and 9. The voltage of the capacitor 11 is applied to the input circuit of the valve, which is an ohmic capacitor, across the low-resistance circuit of thyristors 3 and 9 new load. A surge in current forcefully recharges the input capacitance of the valve from the negative voltage of source 13 to the positive voltage of capacitor 11, thereby forming a steep forward voltage front. After the formation of the leading edge, the valve control current is provided by the source 6. The valve 1 is locked by switching on the control of the switching thyristor 7. The negative voltage of the capacitor 8 is applied to the anode of the thyristor 3, which is possible with a current-limiting unit 5, and it is locked. As block 5, a resistor or a diode biased string can be used, which has a small voltage drop. The input capacitance of the valve, charged to a positive voltage, is quickly recharged to the negative voltage of the capacitor 8 along the circuit of the control electrode 2 - diode 4 - thyristor 7 - capacitor 8 - cathode of the valve. Further, the closed state of the valve is maintained through the resistor 14 by the LZ bias source, the power of which is determined by the leakage current of the input circuit of the valve. After unlocking the thyristor 7, the capacitor 8 begins to recharge from source 6. When the positive voltage of source 6 is reached on capacitor 8, the thyristor 7 is locked. After that, the recharging of the capacitor 8 to the negative voltage of the source 13 begins. The device is ready to be switched on again. Thus, in the proposed device, forced recharging of the input capacity of the valve is performed in transient conditions. The invention provides high speed switching devices made on the basis of electron-beam valves, which allows to increase the efficiency of their use in high-voltage pulse modulators and high-frequency voltage inverters. Claims An apparatus for controlling an electron-beam valve containing a power source connected in series with a current limiting unit and a main thyristor, ground by an oppositely connected diode and connected to the terminals for connecting an electron beam valve to the control electrode, a bypass circuit consisting of series-connected switching thyristor and quenching capacitor connected between the anode of the main thyristor and the source of the negative bias, connected via re Adapters to the transducer for connection: to the control electrode of the valve and to the common point of the switching thyristor and capacitor, characterized in that, in order to improve speed, it is equipped with a chain consisting of a series-connected thyristor, which is triggered by a diode connected in opposite directions, and connected in parallel with the above shunt circuit between the current limiting unit and the negative power supply bus. Sources of information taken into account in the examination . 1. The patent of Sweden No. 117120, cl. 21 d2 12/03, 1943. 2. Patent Czechoslovakia No. 138114, cl. 21 d 12/03, 1973. 3. Elektrotechnik, Z. 1973, A94№9539542, 35, 36.