SU369680A1 - MULTI-VIBRATOR WITH TRANSFORMER COMMUNICATION - Google Patents

Description

one

The invention relates to the field of pulsed technology and can be used in converter devices.

Known multivibrators with transformer LINK, made by the push-pull circuit on two transistors and two transformers, IB of which 1per.vichnymi windings of the main transformer are included in the collector circuit, and the secondary windings of the additional transformer - in the basic circuit of transistor, have a low frequency stability of the generated oscillations.

In order to increase it, a proposed RC-bridge is inserted into the proposed multivibrator with transformer coupling, connected between the secondary windings of the main transformer and primary windings of the additional transformer so that the secondary windings of the main transformer are connected through separating diodes parallel to the matching diodes in the diagonal of the bridge, and the primary windings an additional transformer is included internally in capacitive: the bridge's creek.

FIG. 1 is a schematic diagram of the proposed multivibrator; in fig. 2 is the equivalent circuit of a multivibrator for the first cycle; in fig. 3 - the same for the second cycle.

The proposed multivibrator, implemented (ON the push-pull circuit, contains two transistors} and 2, the main transformer 3, the additional transformer 4 is termed

windings 5 and 6, included in the base circuits of transistors / and 2 through resistors 7 and 8.

A push-pull / C-1 bridge, consisting of starting diodes 9 and 10, comparing diodes // and 12, the time of the driving circuits containing resistors 13 and 14 and capacitors 15 and 16 is included in the feedback circuit of the multivibrator. In the bridge diagonal through the driving diodes 9 and 10, windings / 7 and 18 of the equipped transformer 3 are included. In order not to disrupt the symmetry of the bridge, windings 19 and 20 of the additional transformer 4 are included in the opposite shoulders of the bridge.

Voltage applied to the diagonal m

the bridge is removed from the secondary windings 21 and 22 of the main transformer 3.

The first cycle of operation of the multivibrator (Fig. 1). The open state of the transistor / and the closed state of the transistor 2 correspond.

In this case, the diode 11 is closed, the capacitors 15 and 16 are charged with current from the winding 17 through the diode 9, resistor 14 or 13, respectively, and the windings 19 or 20 of the auxiliary transformer 4. Under the action of the voltage induced by the iB windings 5 and b of the auxiliary transformer 4, the transistors / and 2 are held in the source state. Resistors 13 and 14 and capacitors 15 and 16 are taken at the same rating, therefore, as soon as the voltages on these capacitors become equal to half the voltage of winding 17, diode 11 will open and current iB windings 19 and 20 will stop. The initial jump of the discharge current of the capacitors 15 and 16 accelerates the regen-operative process of overturning the multivibrato. The new state of the multivibrator, when the transistor 1 is closed and the transistor 2 is open, corresponds to the equivalent circuit shown in FIG. 2. In the second cycle of operation of the multivibrator recharging d / capacitors 15 and 16, three-way through the winding 18 of the main transformer 3, and the moment of dropping the multivibrator is determined by opening the diode 12. Next, the processes are repeated. The subject of the invention is a Multivibrator with a transformer connection, containing two transistors, the main and additional transformers, the primary windings of the main transformer, the transformer are included in the collector depy, and the secondary transformers of the additional transformer are in order to increase the frequency stability of the oscillations generated, the trimen / C-bridge connected (between the secondary windings of the main trans-fo; the armature and the primary windings of the pre-onsite transformer so that About the secondary windings of the main transformer are connected via separating diodes parallel to the comparing diodes in the bridge diagonal, and the primary windings of an additional transistor are switched on into the capacitive shoulders of the bridge.