SU399034A1 - TRANSISTOR CONVERTER - Google Patents

Description

one

The invention relates to the field of converter technology and can be used (In power supply systems of industrial installations and transpos, the RT means for converting a constant voltage of one level into P 0 is one H1 voltage of another level.

Current feedback transistor converters are known, which contain an output transformer with two secondary windings and two up and down sources connected to the periotic winding of the transformer according to the zero-output circuit. However, in such converters, the transformer proceeds alternately through the primary semi-windings (each for the half-period of the circuit operation), which leads to their incomplete use and an increase in the converter gabarvts. In addition, the emitter-base and collector-base of the closed transistor are applied to the psxy bus voltages.

In the proposed converter, between the ends of the primary winding of the transformer and one of the output clamps of the K01 inverter, the chains of two consistently connected diodes are connected. Between the points of connection of the diodes of these chains there is one secondary transformer winding, and between the bases of the transistors, another secondary winding of the transformer, the middle terminal of which is connected to the other terminal of the converter.

Such an embodiment of the converter makes it possible to reduce its dimensions.

When using the pp transistors, the cathodes of the diodes of the chains are connected to the ends of the primary winding of the transformer, and when using the pnp transistors, the anodes of the diodes are connected.

The drawing is a diagram of the described converter.

The transformer / converter is made with a primary winding, consisting of two semi-windings 2 to 3, sheath, and a point which is connected to the minus of the power supply 4, and two secondary windings 5 and 6. The winding 6 of the transformer consists of two half-windings 7 and 5. The ends of the primary winding are connected to the collectors of transistors 9 and 10, the emitters of which are connected to a positive power source. The cathodes of the separating diodes 11 and / 2 are connected to the ends of the primary winding of the transformer, and the anodes are connected to the ends of the secondary winding 5 and the cathodes of the rectifying diodes 13 and 14. The anodes of the diodes 13 and 14 are connected to the midpoint of the secondary winding 6, the ends of which are connected to the bases of transistors 9 and 10.

The converter works as follows.

If the transistor 9 is open, the source voltage of the source 4 is applied to the primary semi-winding К ke 2 and hurray,

E. D. of this POE. Current} YUTOCH N: IK PNtaii zamy1etsya on two contours; source 4 - open TpaiH3HiCTOip 9 - primary on semi-winding 2 and source 4 - transition emitter-base of transistor 9 - secondary winding 7 secondary winding 6 - load 15 - rectifying diode J3 - secondary winding 5 - separation diode 12 - primary winding 3. Diodes 14 and / / the current is not allowed through, because the blocking voltages are applied to them. Under the action of a dipstick applied to the primary winding, the core of the transformer is reversal. At the time of saturation of the core 1pamnn, the treating current of the transformer, and consequently, the collector current of transistor 9, increases sharply. Due to an increase in the collector current, the voltage drop across the transistor 9 increases and e. d. all transformer windings are reduced. As a result, the collector current of the transistor 9 begins to decrease. E. D. transformer windings change sign. The transistor 9 is closed, the transistor 10 is opened.

Thus, in the proposed converter, the software currents of both primary semi-winding and transformer flow into each of the half-periods of the circuit operation. A voltage is applied to the input of the transistor, which is different to the voltage of the secondary winding 6,

usually from the conditions of a proper lock-up transistor (1.5-2V). A double voltage supplying the converter is applied to the emitter-collector circuit of the transistor.

And redemt and z obretep and

Claims (3)

1. A current feedback transistor converter containing an output transformer with two secondary windings and two transistors connected to the primary winding of the transformer according to the circuit with a zero view switch, is different lgheyeni dimensions, between. the primary winding of the transformer p is one), from the output clamp of the converter, chains of two consistent-connected dyads are included, and one secondary transformer winding is connected between the junction points of the diodes of these chains, and between the bases of the transistors is another secondary winding of the transformer, the middle of which is connected; n with a different output terminal converter. 2. A converter according to claim 1, characterized in that when using pn transistors to the end (M primary windings of the transformer are connected to the cathodes of the diodes of the chains. 3. The converter according to claim 1, characterized in that when using pn-p transistors, the anodes of the diodes of the chains are connected to the ends of the primary winding of the transformer.