SU1690131A1 - Controlled ac/dc voltage converter - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to simplify and increase efficiency. The regulating element of a voltage converter with switchable regulating elements is made in the form of two transistors 9 and 10 np-p. The emitters of these transistors are combined and connected to the common point of the anodes of diodes m additional rectifiers 6 of the bridge type through which the secondary windings m of additional transformers 2 are connected to the terminals 7 and 8 for connecting the load. The bases of the transistors 9 and 10 of the npn type are connected to the common point of the cathodes of the diodes m of additional bridge-type rectifiers 6 via the output stage of the control circuit 11. Thanks to what the goal is achieved. 1 il.

Description

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The invention relates to electrical engineering.

The purpose of the invention is to simplify and increase efficiency.

The drawing shows a schematic diagram of the power section of the converter.

The converter comprises a main transformer 1 and m of transformers 2. The primary windings of the main transformer 1 and m of transformers 2 are connected in series and connected to terminals 3 and 4 for connecting a power source. The secondary windings of the main transformer 1 and m of transformers 2 through the main bridge type rectifier 5 and m bridge type rectifiers 6 are respectively connected in parallel and connected to terminals 7 and 8 for connecting the load t, the control elements contain two transistors 9 and 10 npn- type, the emitters are connected to each other and to the common point of the anodes of diodes m of rectifiers b of the bridge type, the bases are combined and connected to the common point of the cathodes of diodes m of rectifiers 6 of the bridge through the corresponding output stage about type. The collectors of n-p-n-type transistors 9 and 10 are connected to the corresponding terminals of the secondary windings m of the transferors 2.

In the particular case of the main transformer and the main rectifier may be missing.

The Converter operates as follows.

In the closed state of the output stages of the control circuit 11, the voltage of the secondary windings of the main transformer 1 and m of transformers 2 is fed to pins 7 and 8 for connecting the load. When the output voltage deviates from the nominal value, the control circuit

opens one or more output stages of control circuit 11. As a result, transistors 9 and 10 of the np-n type are opened, as a result of which the reduced resistance of the primary windings of the corresponding m transformers 2 becomes close to zero and, therefore, the corresponding m transformers 2 are excluded from operation, so that the voltage on pins 7 and 8 for connecting the load returns to nominal value.

Claims (1)

Claims: Adjustable AC / DC converter containing m transformers and m bridge type rectifiers, the primary windings of the transformers are connected in series and connected to the terminals for connecting the power supply, the secondary windings of the transformers are connected in parallel and connected to the secondary transformers to terminals for connecting the load, m regulating elements and control circuit, m whose output stages are included in the corresponding control circuits m p Regulatory elements, characterized in that, in order to simplify and increase efficiency, each of the m regulating elements is designed as two pnp transistors, and the emitters of pnp transistors are interconnected and with a common anode point bridge-type rectifier diodes m, npn-type transistor bases are combined and control circuits are connected to the common cathode point of bridge-type rectifier diodes m, and collectors of npn-type transistors are connected to the corresponding terminals of secondary windings m transformers.