SU455455A1 - Generator of bipolar pulses - Google Patents

Description

one

The invention relates to an imimage technique and can be used in thyristor converter control systems.

The well-known generator of di-orio pulses, containing a blocking geerator, which is made according to a circuit with a time reference capacitor in a transistor collector, a form capacitor, resistors, and diodes, is rather complicated in circuit design.

The aim of the invention is to simplify the generator circuitry.

This is achieved in the proposed generator by forming a capacitor with one plate connected to the load, and the other plate through one resistor is connected to the negative power supply bus and through another resistor to the cathode of the diode, the anode of which is connected to the collector of the transistor.

The drawing shows the Priiniiialiya scheme of the proposed generator of different polarities.

The generator of multipolar pulses contains a block-heater, which is discharged on transistor 1 e by transformer 2 and time driven by capacitor 3, connected odine11 to newer power source 4, and the other through winding 5 of transformer 2 and resistor 6 to source voltage 7. nutrition

The winding 8 of the transformer 2 is connected by a lead through a resistor 9 to the base of the transistor 1. and the other to the emitter of this transistor on a positive bus 4 of the source ni-tani. The collector of the transistor 1 is connected to the common point of the oppositely connected diodes 10 and 1. The cathode of the diode 11 is connected to the common point of the winding 5 and the resistor 6.

The formative action consists of series-connected loads 12, which are connected by one output to a positive sheath 4 yarn sources, n forming capacitor 13. This circuit is connected in series with a resistor 14, which is connected to a negative terminal 7 of the power supply with a second terminal.

To a common point of the forming capacitor 13 and resistor 14, a resistor 15 is connected, the second output connected to the cathode of the diode 10. The control winding 16 is connected to the source of control voltage with its own output voltage.

The generator works as follows.

At; 5k.1.yucheiii power supply cable at a fee:; k) hp H1 hm1) At psi-I of the power source - vrsm the terminating capacitor 3 - the winding of the trilisformer 2-resistor 6. blows the charge current 1 time 7 driving capacitor 3, which causes the nation ed with. in the base winding 8. The voltage of this winding closes the traisistor 1.

At the same time along the circuit: the spike positive 4 of the power supply - load 12 - forming capacitor 13 - resistor 14 - negative bus 7, the charging current flows form its capacitor 13. At the same time, in a load 12, an impulse is formed corresponding to its polarity.

The voltage that occurs in the winding 5 of the transformer 2 when the charging current flows through it, the time of the driving capacitor 3 varies according to the law

aj, li

V - L ;.

rft

where and is the voltage of the winding 5;

.- magnetization inductance

transformer 2;

fj. - Transformer magnetizing current 2.

But as far as charging time is concerned, the time of the driving capacitor 3 increases the magnetizing current of the transformer 2 and reaches its maximum. At this point, its derivative becomes zero and then changes its sign to the opposite, and therefore the voltage pool of the windings 5 and 8 of transformer 2 reaches, and then also changes the sign to the opposite.

The previously locked transistor 1 opens like an avalanche. Through the open transistor 1, the discharge time of the capacitor 3 is discharged through the winding 5 and the diode 11, as well as the discharge of the shaping capacitor 13 through the resistor 15, the diode 10, the open transistor 1 and the load 12, resulting in a pulse of opposite polarity.

The resistor 15 is designed to limit the current through the transistor 1, as well as to equalize the time constant charge and discharge circuits of the forming capacitor 13 (if necessary).

As the time of the driving capacitor 3 is discharged, the magnetizing current of the transformer 2 reaches a maximum, and at this point there is a winding 5, varying according to the law

, (/ (II

and L ..

stating equal to zero. Previously saturated and

Transistor 1 closes as an avalanche, as the base voltage of winding 8 is applied to its base, which has changed its sign to the opposite.

Further, the process in the circuit is repeated.

Thus, the generator generates polar impulses in the load. Diodes 10 II 11 are decoupling for the formation (it and the time of the driving peep. Resistor 6 allows for measuring the variable frequency, and resistor 14 for changing the initial pulse duration.

During the operation of the generator through the winding 16, set the direct current of a certain direction and change

its magnitude, then the magnetic permeability of the core of the transformer 2, as well as the magnetization inductance, will also change. A change in the magnetizing inductance leads to a change in the constant times of the charge and discharge circuits in the time of the driving capacitor 3, which causes a change in the frequency of the generated pulses.

By changing the bias current flowing through the control winding 16 in magnitude,

For example, in the function of any parameter, it is possible thereby to automatically change the generator frequency according to the same law.

NOTICE of invention

A generator of bipolar pulses containing a blocking generator made according to a circuit with a prime driving capacitor at the collector value of a transistor, forming a capacitor, resistors and diodes, characterized in that, in order to simplify the generator circuit, the forming capacitor is connected to the load by one plate the plate through one resistor is connected to the negative bus of the power source and

through another resistor with the cathode of the diode, the anode of which is connected to the collector of the transistor.