SU1363400A1 - D.c. voltage converter - Google Patents

Abstract

The invention relates to converter equipment and can be used in secondary power supply systems. The aim of the invention is to increase the efficiency, the Converter contains the main and additional transformers, two additional transistors connected in a differential circuit, a power source, a load and four diodes. The connection of the ends of the primary windings of an additional transformer to the ends of the primary semi-windings of the main transformer allows to realize an operation mode in which one of the collector windings of the main transformer connected to the main transistor locked in this half-period participates in each half-period. Each of the primary half windings of a transformer is used in both half periods of its operation. 1 il.

Description

The invention relates to electrical engineering and can be used in the secondary power supply sources of radio engineering systems of automation and computer technology.

The purpose of the invention is to increase the efficiency of the constant-voltage converter, for example.

The drawing shows an electrical schematic of a DC / DC converter.

The converter contains the main transformer 1 with primary 2 and secondary 3 windings and an additional transformer 4 with primary 5 and secondary 6 windings. The secondary windings 3 and 6 of the transformers are connected in series and connected via the first and second rectifying diodes 7 and 8 to the first output terminal. Second: the output terminal is connected to the middle terminal of the primary winding 2 of the transformer 1. The extreme terminals of the primary winding 2 are connected to the collectors of the main transistors 9 and 10, whose emitters are connected to the second input terminal, and their bases are connected to the emitters of the additional transistors 11 and 12. The collectors of transistors 11 and 12 are connected to the first terminals of the primary windings 5 of the additional transformer 4, the second terminals of which are connected to the collectors of the main transistors 9 and 10, the Base of the additional transistors 11 and 12 respectively They are connected to the middle points of the chains of two oppositely connected diodes 13, 14 and 15–16.

The device works as follows.

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With open transistors 9 and 11, the supply voltage is applied to the primary windings 2 and 5 of transformers i and 4. The polarity of the voltage on the secondary windings 3 and 6 is such that transistors 9 and 11 are maintained in open, and transistors 10 and 12 are in closed state. The power supply current closes in the following three circuits; power supply, winding 2 of transformer 1, main transistor 9, power supply, primary winding 2 of transformer 1 connected to the main transistor 10 closed in this half period, primary winding 5 of an additional transformer 4, additional

the transistor 115 is a base-emitter junction of transistor 9, a power source, a load j, a diode 8, secondary windings 6 and 3, respectively, of transformers 4 and 1, a diode 13, and emitter-base transitions of transistors 11 and 9.

The switching of the transistors in the circuit can be accomplished by saturating both the main and additional transformers, followed by the output of transistors 9 and 11 from the area of saturation to the active area and changing polarity on all windings

transformers. After closing the transformers 9 and 11, the transistors 10 and 12 are opened, after which all the processes in the device are repeated.

From the analysis of the converter operation, it follows that in each half-period one of the collector windings of the main transformer, connected to the main transistor locked in this half-period, participates in the operation. Thus, in the converter, each of the primary windings of the main transformer is used in both half-periods of its operation. Approximately twice the voltage of the power source is applied to the primary windings 5 of the additional transformer 4, the relative losses in transistors 11 and 12 are reduced, which is the efficiency of the converter.

increases

35

Claims (1)

Invention Formula A constant voltage converter containing the primary and secondary transformers, the secondary windings of which are connected in series and connected through the first and second rectifying diodes connected in series to counter, the connection point of which is connected to the first output terminal, the second output terminal is connected to the first input terminal output and to the average output of the primary winding of the main transformer, the extreme terminals of which are connected to the collectors of the main transistors, whose emitters are connected cheny to the second input terminal, and the base - to the emitters of two additional transistors, the bases of which are connected respectively via the third and fourth rectifying diodes to the free leads of the main and auxiliary transformers, the fifth and sixth diodes connected between the second input terminal and the bases of two additional transistors, the collectors of which are connected to the first terminals of the two primary additional windings Transformer, About t. Editor I. Segl. Nick Compiled by V.Ezhov Tehred L.Serdyukova Order 6375/50 Circulation 659 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4  , 13634004 In order to increase the efficiency, the second terminals of the primary windings of the additional transformer are connected to the extreme terminals of the primary winding of the main transformer. Corrector about. Kravtsov