SU1646039A1 - Vacuum-tube oscillator - Google Patents

Description

one

(21) 4457470/09

(22) 07.06.88

(46) 04.30.91. Bul sixteen

(71) Leningrad Electrotechnical Institute. IN AND. Ul Nova (Lenin)

(72) Yu.I. Blinov, A.S. Vasiliev, B.V., Kogan and N.N. Malkov

(53) 621.373.42 (088.8)

(56) Vasiliev A.S. High-frequency generators for induction heating .- L .: Mashinostroenie, 1979, p. 50, fig. 3d.

(54) LAMP GENERATOR

(57) The invention relates to high-frequency electrons. The purpose of the invention is to reduce the ripple of the amplitude of the output voltage. To do this, when generating a high-frequency signal using a generator triode 1, a circuit and a variable component of the grid current and circuit 5 of a constant component of the grid current, the amplitude fluctuations are compensated. The invention relates to high-frequency electrothermal and can be used in electrothermal process units .

The aim of the invention is to reduce the ripple of the amplitude of the output voltage.

The block diagram of the tube generator is shown in the drawing.

The lamp generator contains a generator triode 1, anode circuit 2,

on the anode circuit 2 and the load 3. This is due to the supply from the output of the rectifier 7 connected to the anode block choke 6 through the voltage sensor 8 to the first, second and third band-pass filters 9, 10 and 11, The main harmonics of the pulsations, and the appropriate selection of the phase shift of these harmonics by the first, second and third phase shifters 12, 13 and 14. The resulting components are summed in the adder 15 and fed through the amplifier 16 to the control driver 17, which controls the rectifier 18, which second resistor 19 generates a voltage proportional to the voltage at the output of the adder 15. This voltage falling on the grid of the transistor 1 via the generator circuit 5 D.C. grid current causes compensation and reduced ripple output voltage amplitude of the generator tube. 1 il.

3

load 3, circuit 4 of the variable component of the grid current, circuit 5 of the constant component of the grid current, blocking anode choke 6, rectifier 7, voltage sensor 8, first, second and third band-pass filters 9, 10 and 11, first, second and the third phase shifters 12, 13 and 14, the adder 15, the amplifier 16, the driver 17 of the control signals, the controlled rectifier 18 and the resistor 19.

1B

O5 n Ze

W Ј

The lamp generator operates as follows.

A powerful high-frequency signal is generated using generator triode 1, anode voltage to which is fed from rectifier 7 through anode blocking choke 6, circuit 4 of variable current component Inaccurate current and circuit current jQ component 5 due to capacitive feedback through the parasitic elements of the generating triode 1. The generated signal is separated on the anode circuit 2 and is fed to the load 3, which f is a setup for implementing the required process of heating material supplied.,

The voltage sensor 8 generates a signal 20 proportional to the voltage at the output of the rectifier 7, containing low-frequency pulsations. The signal from the output of the voltage sensor 8 is fed to the first, second and third band 25 filters 9, 10 and 11, each of which is tuned to one of the harmonics of the output voltage of the rectifier 7. Decomposed into the main harmonic components of the ripple voltage JQ falls on the inputs of the first, second and third phasers 12, 13 and 14, respectively. Each of them creates the necessary phase shift for the corresponding harmonic. After this, the harmonics are added in the adder 15.

The amplifier 16 matches the output impedance of the adder 15 with the input impedance of the former 17 up-1 equalizer of the signals. The controlled rectifier 18 forms a voltage across the resistor 19 proportional to the output voltage of the adder 15. The received signal is applied to the grid 45 of the generating triode 1 through the circuit 5 of the constant component of the grid current, which causes compensation of the ripples of the output voltage of the voltage generator 7 .

Since the phase characteristics of the lamps of the new generator are such that the phase –d shift for different harmonics is different and does not necessarily depend linearly on frequency, the adjustment of the amplitudes and phases of the harmonic components is made experimentally. her

Compensating the ripple of the output voltage of the rectifier 7 reduces. Pulsation of the amplitude of the output voltage

lamp generator, which allows to improve the parameters of technological processes in which the lamp generator is used.

Claims (1)

Invention Formula A tube generator comprising a generator triode, an anode circuit, a variable component of the grid current, a constant component of the grid current, a load, an anode blocking choke and a rectifier, the first output of the anode circuit, the first output of the load, and the first output of the blocking anode throttle connected to the anode of the generator triode; the first output of the variable component of the grid current and the first output of the constant component of the grid current are connected to the grid of the generating truss; the first output the rectifier bus is connected to the second output of the blocking anodic throttle, the second output bus of the rectifier, the cathode of the generator circuit, the second output of the anode circuit, the second output of the load, the second output of the variable component of the grid current are connected to a common fault, which is that, in order to reduce ripple of the amplitude of the output voltage, a resistor is inserted in it, a voltage sensor connected in series, a first band-pass filter, a first phase shifter, a summer, a driver of control signals and control An optional rectifier, a second band pass filter and a second phase shifter connected in series, a third band pass filter and a third phase shifter connected in series, the input of the voltage sensor connected to the first output of the rectifier, the input of the first, second and third bandpass filters connected to the output of the voltage sensor , the outputs of the second and third phasers are connected respectively to the second and third inputs of the adder, the first output bus of the controlled rectifier is connected to the first output of the resistor and to the second The output of the DC component of the grid current is the same, and the second output bus of the controlled / rectifier and the second output of the resistor are connected to the common bus.