SU1515302A1 - D.c. voltage converter - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to power conversion devices, and can be used in sources of secondary power supply for electronic equipment. The goal is to simplify the circuit while improving reliability by limiting overvoltages on the circuit elements. The converter contains switching transistors 2, 3, connected to the source of supply voltage and to the ends of the primary winding of transformer 4, which consists of two half-windings connected in series-counter. Capacitor 1 is connected between the middle terminal of the primary winding and the terminal of the supply voltage source. A resistor 5 is connected between the ends of the primary winding of the transformer 4. Resistor 5 serves to suppress voltage surges across the switching transistors 2.3. EMF emissions of self-induction inductance dissipated through a resistor 5 by an open transistor 2 or 3, while the power allocated to resistor 5 is negligible. Therefore, with high reliability of operation, this converter is characterized by simplicity of design. 1 il.

Description

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The invention relates to energy conversion devices and can be used in the secondary power supply sources of electronic equipment.

The purpose of the invention is to simplify the circuit in terms of reliability by limiting the stresses on the circuit elements

The drawing shows a schematic diagram of the converter.

The converter contains a capacitor 1, switching transformers 2 and 3 connected to the ends of the primary winding of the output transformer 4 and a source of supply voltage, a resistor 5 connected between the ends of the primary winding of the output transformer A and the source of supply voltage, a resistor 5 connected between the ends of the primary winding output transformer 4.

The converter works as follows.

The control pulses arrive at the bases of transistors 2 and 3, causing alternating current flow through the half windings of the output transformer. A. Since the semi-windings are the same and are included in the opposite direction, the potential difference between their external outputs, caused by the main magnetic flux, is zero. Thus, the composer T, Ershova Editor O.Spesyvykh Tehred L. Kravchuk Proofreader V.Girn to

Order 6289/53

Circulation 648

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

2

The primary windings are equal potential points, which allows them to be connected between each other with a low resistance element, such as a resistor. During the operation of the converter through the resistor 5, a small current flows, caused by the asymmetry of the parameters of the semi-windings,

At the moment of switching of transistors 2 and 3, the disconnecting half-winding is shunted by resistor 5, thereby eliminating voltage surges on transistors 2 and 3, which exceed the voltage of the power supply.

Claims (1)

Invention Formula A direct current transformer containing two switching transistors, each of which is connected between the respective input terminal and the end of the primary winding of the output transformer, inserted in the form of two half-windings connected in series-counter, a capacitor connected between the common point of the half-windings and One of the input terminals, characterized in that, in order to simplify the circuit while increasing reliability by limiting the voltages on the circuit elements, between the ends of the transformer primary winding includes n resistor. Subscription