SU1420650A1 - Shaper of quasi-sine pulses - Google Patents

Abstract

The invention relates to radio engineering and can be used in transmitters of high power, in particular for driving high frequency harmonic oscillations. The aim of the invention is to increase the efficiency when generating quasi-sinusoidal pulses, which is achieved by using the key mode of the transistors. The device contains a generator of 1 rectangular pulses, sources 2 and 6 of constant voltage, amplifying lamp 3, output 4, resistor 5, transistors 7 and 11, diodes 8 and 13, inductors 9, 14 and 15, driver 12 pulses, capacitors 10 and 16. The proposed generator provides a high efficiency in the formation of short pulses for the lamp of an excited cascade at small cut-off angles of current pulses. 2 Il. with

Description

 to

about

O5

sd

The invention relates to radio engineering and can be used in high-power transmission technology, in particular, to excite radio frequency harmonic oscillations.

The purpose of the invention is to increase the efficiency in generating quasi-sinusoidal pulses by using the key mode of the transistors.

FIG. Figure 1 shows the structural electrical circuit of the device; in fig. 2 - timing diagrams for the operation of the device.

The device contains a generator of 1 nr of pulses, the first output of which is connected to the total width of the device, the first source of 2 constant voltage, the positive output of which is connected to the total width, an amplifying lamp 3, the anode of which is connected to the output width, and the grid through a resistor 5 f- with a negative terminal of the first constant-voltage source 2, the second constant-voltage source 6, the negative terminal of which is connected to the common bus, the first transistor 7, the emitter of which is connected to the common bus, and the base to the second output of the e

pulse 1 pulse, the first diode 8, the base

Secondly, it is connected to the collector of the first transistor 7, the first inductance coil 9, the first output of which is connected to the emitter of the first diode 8, and the second output to the grid of the amplifying lamp 3, FIG. 2 shows time diagrams illustrating the operation of a quasi-sinusoidal pulse generator, where a is the voltage applied to the base-emitter section of the transistor 11,

capacitor 10, the first output of which has the form of a pulse sequence connected to a common bus, the second transistor 11, the emitter of which is connected to the second terminals of the first capacitor 10 and the first inductor 9, the driver 12 pulses connected between the emitter and the base of the second transistor 11, The second diode 13, the base of which is connected to the collector of the second transistor 11, the second 14 and the third 15 inductors (interconnected), the second capacitor 16,

The combination with the duration b is the voltage Ufio on the capacitor 10 and the grid-cathode portion of the lamp 3.

From the moment the recharge of the capacitor begins through the transistor 11 and the inductors 14 and 15 from the constant voltage source 6. The voltage on the capacitor 10 increases from a value of -U. After passing through -Ed (lamp unlocking voltage) anode current appears in

The first terminal of which is connected to the emitter is 40 lamp 3, and after passing through O and the grid of the second diode 13 and the end of the second current, which leads to a deviation

coils 14 inductance, the third diode 17, a curve of the cosine shape

the emitter of which is connected to the second output (Schtrich line).

The second capacitor 16 and the end of the third. The resistor 5 has almost no effect on the rolling inductance 15, the beginning of which is the charge and discharge processes of the capacitor 10,

connected to a common bus, and the beginning of the second because its resistance is chosen so large that the current through it is many times less than the currents in the other elements of the circuit. A resistor 5 is needed to create an initial negative voltage on the lamp grid before the trigger pulses are applied to the transistor M (in order to avoid the premature appearance of an anode current in

The inductance coils 14 are combined with a base of the third diode 17 and connected to the positive terminal of the second source 6 of constant voltage.

The device works as follows.

At the initial moment of time, the transistors 7 and 11 are locked, the capacitor 10 is charged to the negative voltage of the source of the constant voltage 2, Еu, bla50

lamp 3)

The shape of the anode current ia (Fig. 2c) corresponds to the shape of the voltage Udo (Fig. 2b)

godar what lamp 3 is locked and its anode-55 during the time when Uc is greater than -Ed.

current is zero. The signal of the driver 12 pulses on the capacitor 16 is charged before the voltage goes out of phase with the signal of the power supply source 6 - EC. of 1, therefore at the moment of time TC transis0

0 tick

five

5 neglected.

The generation of a voltage pulse of a predetermined shape on the grid of the lamp 3 is achieved by applying a square voltage pulse to the base-emitter section of the transistor 11, from the driver 12 pulses that unlocks the transistor 11 and converts it to the saturation mode.

At the moment of unlocking the transistor, the charge of the capacitor 10 starts. Due to the low internal resistance of the source 3 and the capacitor 16, the inductors 14 and 15 are connected in parallel and for alternating arrests they represent an equivalent load with a reduced inductance. To increase this equivalent inductance with the same coils 14 and 15, it is advisable to carry out the latter with the same number of turns and associate the magnetic mutual inductance of M.

The capacitance of the capacitor 16 is sufficiently high and during the operation of the generator the voltage on it remains almost unchanged, equal to Ек, the output voltage of the source 6 of the constant voltage, since the drops of the DC voltages on the coils 14 and 15 can

neglected.

FIG. 2 shows time diagrams illustrating the operation of a quasi-sinusoidal pulse generator, where a is the voltage applied to the base-emitter section of the transistor 11,

it has the form of a pulse pulse series 3),

The shape of the anode current ia (Fig. 2c) corresponds to the shape of the voltage Udo (Fig. 2b)

during the time when Uc is more -Edo.

the torus 11 closes, and a pulse from the generator 1 opens the transistor 7, and a chain consisting of the inductance coil 9, a diode 8, connected in series with the transistor 7 is connected to the discharge circuit of the capacitor 10. This allows to obtain the slope of the falling part of the anode current pulses adequate to the growing part of the same impulses. In the absence of transistor 7, the inductance coil 9 could not be sufficiently small due to the occurrence of an overload by the current of transistor 11. This prevents the shortening of the durations of the fronts of the pulses ia, the regulation of the durations of the pulses and the acquisition of the radio clock

A quasi-sinusoidal pulse generator containing a rectangular pulse generator, the first output of which is connected to the common bus of the device, the first constant voltage source, the positive terminal of which is connected to the common bus, an amplifying lamp, the anode of which is connected to the output voltage of the device, cathode - with a common busbar, and the grid through a resistor - with a negative output of the first constant voltage source, the second constant voltage source, the negative output of which is connected to the oscillations of the general a torus on a lamp 3 with a 5-pin tire, distinguished by the fact that, with a view to a higher frequency.

The interval from m to t can vary widely, which allows for any duration of pulses la.

Now consider the operation of the recovery circuit included in the collector circuit 20 of transistor 11. When the transistor 11 is locked at time t, the voltage across its collector under the influence of EMF of self-induction catuplec 14 and 15 increases sharply.

efficiency increase, the first transistor, the emitter of which is connected to the common bus, and the base is connected to the second output of the pulse generator, the first diode, the base of which is connected to the collector of the first transistor, the first inductance coil, the first output of which is connected to the emitter of the first diode, and the second output - with the grid of the amplifying lamp, the first capacitor, the first terminal of which is connected to the ob30

With a voltage across the collector of the transistor 25, the bus, the second transistor, the emitter, the co-diode, opens and limits the voltage. The energy of coils 14 and 15 is given to source 6.

Due to diode 13, a reverse current cannot flow through the transistor 11, which expands the functionality of the generator and increases its reliability.

Thus, since transistor II operates in the rise mode, the residual voltage on it and the corresponding losses on its collector are extremely small. Small losses and other elements of the chain, which increases the efficiency of the generator.

A quasi-sinusoidal pulse generator provides high efficiency in the formation of short pulses for the lamp of an excited cascade at small cut-off angles of current pulses.

35

40

first connected to the second terminals of the first capacitor and the first inductor, the pulse driver connected between the emitter and the base of the second transistor, the second diode, the base of which is connected to the collector of the second transistor, the second and third interconnected inductors, the second capacitor whose first output is connected to the emitter of the second diode and the end of the second inductor, the third diode, the emitter of which is connected to the second output of the second capacitor and the end of the third inductor, beginning of which is connected to sheathe the tire, and the beginning of the second inductors - from the base of the third diode and the positive terminal of the second source of constant voltage.

Claims (1)

Invention Formula A quasi-sinusoidal pulse generator containing a rectangular pulse generator, the first output of which is connected to the common bus of the device, the first constant voltage source, the positive terminal of which is connected to the common bus, an amplifying lamp, the anode of which is connected to the output voltage of the device, cathode - with the common bus, and the grid through the resistor with the negative output of the first constant voltage source, the second constant voltage source, the negative output of which is connected to the common bus, is different the fact that, for the purpose of  by the bus, distinguishing itself by the fact that efficiency increase, the first transistor, the emitter of which is connected to the common bus, and the base is connected to the second output of the pulse generator, the first diode, the base of which is connected to the collector of the first transistor, the first inductance coil, the first output of which is connected to the emitter of the first diode, and the second output - with the grid of the amplifying lamp, the first capacitor, the first terminal of which is connected to the bus, the second transistor, the emitter is  bus, the second transistor, the emitter first connected to the second terminals of the first capacitor and the first inductor, the pulse driver connected between the emitter and the base of the second transistor, the second diode, the base of which is connected to the collector of the second transistor, the second and third interconnected inductors, the second capacitor whose first output is connected to the emitter of the second diode and the end of the second inductor, the third diode, the emitter of which is connected to the second output of the second capacitor and the end of the third inductor, beginning of which is connected to sheathe the tire, and the beginning of the second inductors - from the base of the third diode and the positive terminal of the second source of constant voltage. US FIG. 2