SU1522363A1 - Dc to dc voltage converter - Google Patents

Abstract

The invention relates to converter equipment and can be used in power supplies for electronic equipment. The goal is to increase reliability by reducing the switching overloads of transistors. The converter contains two single-ended bridge inverters 8, 9 with output transformers 14, 15 connected via primary windings 21, 22 of chokes 19, 20 to the input terminals. The secondary windings of the output transformers 14, 15 are connected via diodes 16, 17 to an LC filter 18. Key current controller 1 is connected to the input terminals by an input, and output to a circuit consisting of in-line demagnetizing 23, 24 output transformers 14, 15 and the secondary windings of the chokes 25, 26. The chokes 19, 20 limit the switching current surges through the transistors 4-7 when the inverters 8, 9 are switched from pause mode to voltage generation mode. In the converter, the magnetization reversal of the output transformer cores 14, 15 and the chokes 19, 20 is carried out at intervals of the demagnetizing current, the value of which is set by the key current regulator 1. 1 sludge.

Description

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

The purpose of the invention is to increase the reliability of a constant voltage converter by reducing switching overloads in transistors.

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

The converter contains a key current regulator 1, the control input of which is connected to the output of a voltage sensor 2 connected to the input terminals of the converter, a control unit 3 whose outputs are connected to the control inputs of transistors 4-7 of two single-cycle bridge inverters 8, 9c with return diodes 10 13, the output transformers 14, 15, the secondary windings of which are connected via rectifiers in the form of diodes 16, 17 and filter 18 to the output terminals of the converter, two double-winding chokes 19, 20, the primary windings 21, 22 of which are on cheny consistently with single-ended bridge inverters 8, 9 to input vshodam, demagnetizing winding 23 - 26, respectively, the output transformer

14,15 and double-wound chokes 19, 20, connected in series and connected to the output terminals of the key current regulator I,

The Converter operates as follows.

The control unit 3 generates square-shaped voltage pulses that are applied to the bases of transistors 4, 5, and in antiphase to the bases of transistors 6, 7 of single-ended bridge inverters 8, 9. Single-bridge bridge inverters 8, 9, alternately turning connect the primary windings of the output transformers 14, 15 through the primary windings 21, 22 of the chokes 19, 20 to the input of the outlets. Voltage pulses are generated in the primary windings of transformers 14, 15, which are transformed into a secondary voltage.

the secondary windings and demagnetizing windings 23, 24. The voltage of the secondary windings is rectified by diodes 16, 17 55 and smoothed by filter 18. In the switch-on interval of the transistors, chokes J9, 20 limit the inrush current through

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current conducting diodes 10-13 and switchable transistors 4-7, with the magnetic conductors of chokes 19, 20 magnetized through a hysteresis loop to the saturation induction value and after a time equal to the time of switching off the diodes, the chokes of the chokes become saturated. In the pause interval, the energy stored in the output transformers at the stage of pulse formation is output through diodes 10-13 through the primary windings 21, 22 of the chokes 19, 20. In the interval of pauses, the magnetic circuits of the transformers 14, 15 and magnetic circuits of the chokes 19, 20 are switched by demagnetizing current flowing through sequentially connected windings 23, 24 of demagnetization and windings 23, 26

. chokes 19, 20 and key regulator 1 current. The magnitude of the demagnetization current is set by the key current regulator 1. The magnitude of the de-magnetizing current is set by the key current regulator 1 such that by the beginning of the next pulse formation interval the complete reversal of the magnetic cores of the transformers 14, 15 and the chokes 19, 20 and the retention of their fixed magnetic state is maintained. Therefore, regardless of the voltage on the demagnetizing windings, this allows one to avoid saturation of the magnetic cores of transformers 14, 15 and to use the magnetic cores of chokes 19, 20 almost completely by induction.

Thus, the introduction of two two-winding chokes in a constant voltage converter, the inclusion of their primary windings at the input and biased diagonals of single-stroke bridge inverters and the connection of their secondary windings are consistent with demagnetizing windings

 output transformers of single-ended inverters allow to increase the reliability of the converter by reducing switching current surges and improve weight and size by reducing the mass and size of the choke cores 2 to 3 times due to the full use of magnetic inductor chokes.

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Claims (1)

The formula of the invention. eni DC to DC converter containing two single-ended bridge inverters with return diodes and output transformers, the secondary windings of which are connected via rectifiers to the filter input, the output of which is connected to the output terminals of the converter, the key current controller, the input terminals of which are connected to the input terminals of the converter, the control input to the output of the voltage sensor and output outputs - to the first outputs of the demagnetizing windings of the output transformers of single-ended bridge inverters, controlled by the switch the transistor inputs are connected to the outputs of the control unit, which is characterized by the fact that, in order to increase reliability by reducing switching overloads in the transistors, two double-winding droplets are introduced, the primary windings of which are connected in series with each of the two bridge odiota inverters The converter inputs and the secondary windings are connected in series with demagnetizing windings of the output transformers.