SU1328943A1 - Device for stabilizing current of transmitting television tube beam - Google Patents

Abstract

The invention relates to a TB technique and provides an increase in the stability of a beam current (TF) in an extended range of supply voltages with simultaneous reliability. The device contains a transmitting television tube 1, a driver for 2 pulses of quenching, a synchronizing generator 3, a pulse converter 4 of voltage, including a switch 5 and a transformer 6, a high-voltage rectifier 7, a resistor (P) 8, a regulator 9 of the amplitude of pulses, a capacitor U, latch 11, expander 12, voltage source 13, comparison unit 14. The regulator 9 contains a transistor 15, a capacitor 16 and P 17. During the regulation of the TP, information on the changes in the TP is removed from P 8 and fed through the capacitor 10 to the block 14, which compares the amplitude of the pulses with the source voltage 13 and increases output pulses with an amplitude proportional to the difference in input voltages. The pulses of the unit 14 are fed to the regulator 9 to control the amplitude of the pulses received through the P 17 from the transformer 6. The capacitor 16 delays the pulses of the block 14 somewhat and suppresses interference caused by the difference in the transit time of the horizontal pulses from the synchro generator 3 on different chains m. 1 zp f-ly, 1 ill. . (L with: N: o: o

Description

The invention relates to television technology and can be used in the power supply chains of television transmission cameras.

The purpose of the invention is to increase the stability of the beam current in an extended range of supply voltages while simultaneously increasing the reliability of the device.

The drawing shows a structural electrical circuit, a device for stabilizing a beam current of a transmitting television tube.

The device contains a transmitting television tube 1, a driver for 2 pulses of quenching, a synchronous generator 3 ,. a voltage pulse converter 4 including a switch 5, a transformer 6 and a high-voltage rectifier 7, a resistor 8, a pulse amplitude regulator 9, a capacitor 1-0, a latch 1 level, a rectifier 12, a source 13 of the reference voltage, a unit 14 comparison .

The impulse amplitude regulator 9 comprises a transistor 15, a capacitor 16 and a resistor 17.

The device works as follows

In the initial state before adjusting the beam current to the cathode of the transmitting television tube I from the driver output. 2, pulses are damped by the beam current, which are generated by the horizontal and frame frequency signals of the synchronous generator 3. The horizontal pulses of the synchronous generator 3, the duration of which is not more than the damping pulses, are fed to the control input of the key 5 of the pulse converter 4, the Key 5 is switched permanently the voltage of the source, which is connected to the key input through the primary winding of the transformer 6, the pulses of the secondary winding of the transformer 6 are fed to the inputs of the high voltage rectifier 7 which feeds a constant All electrodes, including through the resistor 8 and the first anode of the transmitting television tube, are additionally supplied. In addition, the secondary windings of the transformer 6 of positive polarity are fed to the second input of the regulator 9.

The positive polarity of the pulses arriving at the regulator 9 makes it possible to use for the regulation of the amplitude of transis

28943 .2

The torus has 15 ppn structures, which allows a higher (up to 1000 V) collector supply voltage. This ensures high stability and reliability of the device operation, as well as expands the range of pulse amplitude control,

With the control code 9 pulse

Q line frequency of a positive polarity with a set amplitude is fed to the input of a level lock 11, at the output of which the signal has a negative polarity. Output signal

5 latches 11 level converted

the rectifier 12 to a constant voltage, which is applied to the control electrode of the transmitting television tube 1,

2Q During beam current regulation, information about changes in beam current is removed from a resistor 8 connected to the power supply circuit of the first anode of the television tube and through a capacitor

25 10 is fed to the input of block 14 as compared. The latter compares the amplitude of the pulses with the reference voltage of source 13 and extracts pulses, the amplitude of which is proportional to the difference of the input voltages. The output pulses of the block 14 are fed to the input of the regulator 9 of the pulse amplitude to regulate the magnitude of the amplitude of the pulses received through the resistor 17 from the transformer 6, The pulses arriving at the inputs of the regulator 9 coincide in time. The capacitor 16 somewhat delays in time the pulses of the unit 14 and suppresses interference that occurs due to the difference in the transit time of the horizontal frequency pulses from the clock generator 3 along different circuits.

35

Claims (2)

45 Formula of invention  1, A transmission tube current beam stabilization device comprising a comparison unit, The primary input of which is connected to the output of a voltage source, a rectifier and a series-connected synchronous generator, a pulse voltage converter and a high-voltage rectifier, the output of which is connected to the first anode of a transmitting television tube, is different from increase the stability of the beam current in an expanded range of supply voltages while improving the reliability of the device, a quenching pulse generator, the input of which is connected to the second output synchrogen, is introduced and the output is connected to the cathode of the transmitting television tube, a separating element, a pulse amplitude regulator and a level lock, the separating element being connected between the first anode of the transmitting television tube and the second input of the comparator unit, the output of which is through a series-connected pulse amplitude regulator, level clamp and the rectifier is connected to the control unit 28943 the transmitting television tube, and the second input of the pulse amplitude regulator is connected to the second output of the pulse voltage converter. 2. The device as claimed in claim 1, wherein the pulse amplitude regulator contains a 1Q pn-structure transistor, the emitter of which is connected to the common bus, the base and collector of the transistor are respectively the first input and output pulse amplitude controller, 15, the second input of which is through a resistor. . connected to the collector of the transistor i and a capacitor is connected between the base and the emitter of the transistor.