SU1622923A1 - Blocking-generator of pulsed symmetrical voltage - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to increase the efficiency of the blocking generator. For this, a winding 6 is inserted into it, placed on the core of the magnetic switching element in a plane parallel to the plane of the main magnetic flux. The winding is connected between the control inputs of the keys 1 and 2 (transistors). The blocking generator also contains windings 3, 4 and power supply 5, 1 sludge.

Description

w

Yo

ABOUT

Che

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Yu

Sj

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The invention relates to a pulse technique, in particular to a pulse shaper, and can be used in various radio engineering devices (a class of blocking generators).

The purpose of the invention is to increase efficiency.

The drawing shows an electrical schematic diagram of the device.

The pulsed symmetric voltage generator contains the first 1 and second 2 switches (transistors), the outputs of which are connected through the first winding 3 of the magnetic switching element with positive feedback through the second winding 4 of the magnetic switching element, and the middle point of the first winding 3 of the magnetic switching element connected to the inputs of the first 1 and second 2 keys, through the power source 5. A third winding 6, located on the core of the magnetic switching element in a plane parallel to the plane of the main magnetic flux, is connected between the control inputs of the first 1 and second 2 keys.

The device works as follows.

When a blocking generator is connected to the voltage source 5 as a result of the inevitable asymmetry of the circuit and fluctuations, the current in one of its halves increases somewhat faster than in the other. If the regeneration condition is fulfilled, the process is avalanche-like, and one of the keys (for example, 2) is saturated and the other is closed. On the output winding of the magnetic switching element, a half-wave of the output voltage is formed. When the third winding 6 is turned off, the blocking generator operates in a manner similar to the well-known autogenerator (Roher). The switching of transistors 1 and 2 is determined by the saturation induction B $ of the core of the magnetic switching element, and the frequency of generation can be determined from the following expression:

fr

UBX 1 (G 4BsQcTxWi

where UBX is the input voltage of the generator. AT; QCTX - the cross section of the magnetic material of the core of the magnetic switching element in the direction X, cm; (in the direction of Y - Ost);

Bs is the induction of saturation along the X direction (conditional direction), T;

Wi is the number of turns of the semi-winding of the magnetic switching element.

When the third winding 6 is connected, a current begins to flow, which creates an additional orthogonal

component of magnetic induction in the direction of Y. (Moreover, the Kirchhoff equation for point A is determined as follows: 11 1з + 1B, (1)

with additional winding 414 0 disabled.

li lB UB / RB.

The magnetizing current flowing through the third winding 6 is equal to

.

where Ser is the average length of the magnetic field line in the Y direction;

H is the intensity of the magnetic field in the direction Y;

h - current in the third winding; B current base of the second winding;

L / C - the number of turns in the third winding;

UB, RB - respectively, the voltage in the second winding, the resistance in the second winding circuit.

With an isotropic core material of the magnetic switching element, the total induction of Bs saturation (full saturation of the magnetic material of the core) is determined

AT.

(2)

40

Then the frequency of generation can be determined from the following condition

fr

where UBX, UB are the voltages of the power supply source 5, on the second winding 4, the choice of the number of turns Wi and L / W is set

generation frequency of the blocking generator. When the total induction reaches the value of Bs (fulfillment of condition (2)), the core of the magnetic switching element of saturation, while the current increases sharply

previously open transistor 2, but at the same time, according to equation (1), the base current of the same transistor decreases sharply, since is H - s, but 1z I C, and when saturating transistor 2 exits saturation by increasing the collector current I and decreasing the base current, which significantly shortens the transistor's time under extreme current before starting the regenerative process, which closes the previously open transistor and opens the closed one. The practical implementation of a magnetic switching element with crossed (orthogonal) fields deserves attention.

An inner coil with a wound winding Wi, L / B, WBbix is placed in a pan core (for example, 05-20 Ferrite HM2000), then the core halves are glued together and the winding 6 is wound through the hole. A lot of blocking generators for example, built according to the Roer autogenerator circuit with current sensors, with an increase in voltage on which the base (control) windings are shunted.

Claims (1)

Invention Formula A pulsed symmetric voltage generator containing the first and second keys, the outputs of which are connected through the first winding of a magnetic switching element with positive feedback through the second winding of a magnetic switching element, the terminals of which are connected to the control inputs of the first and second keys, and the middle point The first winding of the magnetic switching element is connected to the inputs of the first and second switches through a power source, characterized in that. In order to increase efficiency, a third winding is inserted into it, placed on the core of the magnetic switching element in a plane parallel to the plane of the main magnetic flux, connected between the control inputs of the first and second keys.