RU2769854C1 - Method of assembling power part of voltage converters - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to converting equipment, in particular to single-ended voltage converters with galvanic isolation, converting direct voltage to direct voltage, and can be used in power supply systems of radio engineering, automation and computer equipment. Method of assembling a power part of a voltage converter, comprising a magnetic conductor of a transformer, primary and secondary windings, input capacitors, an electronic switch, a power rectifier, output capacitors and polygons, connected to negative poles of input and output voltage, characterized by that the magnetic conductor of the transformer is made in the form of a combination of a U-shaped core and a closing plate or two U-shaped cores, wherein the primary and secondary windings, electronic switch and power rectifier are located completely or partially between rods of magnetic conductor of transformer, and arrangement of elements of arrangement of converter is symmetrical relative to longitudinal axis of magnetic conductor of transformer. Proposed method of layout of the power part of the voltage converter comprises bypass rectifiers and throttle arranged in symmetry about transformer magnetic core lengthwise axis.

EFFECT: increase in the arsenal of means in terms of creating the power part arrangements of single-cycle flyback and forward voltage converters with galvanic isolation, allowing to obtain a high-tech small-sized product with a reduced level of radiated and in-phase conducted radio interference.

1 cl, 6 dwg

Description

The invention relates to converting technology, in particular, to single-cycle voltage converters with galvanic isolation, converting direct voltage into direct voltage, and can be used in power supply systems for radio engineering, automation and computer technology devices.

Known schemes of single-cycle flyback voltage converters (ECEN4517 http://ecee.colorado.edu/~ecen4517/materials/flyback.pdf), in general form, are converters that store energy in the magnetic circuit of a power transformer during the closed state of the electronic key, and then transferring this energy to the load during the open state of the electronic key.

Known schemes of single-ended forward voltage converters (Texas Instruments Incorporated;

https://www.ti.com/jp/lit/ml/slup175/slup175.pdf) that transfer energy to the load immediately during the closed state of the electronic key.

These schemes provide high variability in the creation of layouts of the power section of single-cycle flyback and forward voltage converters with galvanic isolation, which makes it possible to create a high-tech small-sized product with a low level of radio interference.

The technical result consists in increasing the arsenal of tools in terms of creating layouts for the power section of single-cycle flyback and forward voltage converters with galvanic isolation, which make it possible to obtain a high-tech small-sized product with a reduced level of radiated and common-mode conductive radio interference.

The technical result is achieved by the fact that the layout method of the power part of the voltage converter, containing the magnetic circuit of the transformer, the primary and secondary windings, input capacitors, an electronic key, a power rectifier, output capacitors and polygons connected to the negative poles of the input and output voltage, in such a way that the magnetic circuit The transformer is made in the form of a combination of a U-shaped core and a closing plate or two U-shaped cores, with the primary and secondary windings, an electronic key and a power rectifier located completely or partially between the transformer magnetic core rods, and the location of the converter layout elements is symmetrical relative to the longitudinal axis of the transformer magnetic circuit . The layout method of the power part of the voltage converter may include bypass rectifiers and a choke located symmetrically with respect to the longitudinal axis of the transformer magnetic circuit.

The essence of the invention is illustrated by drawings, where in Fig. 1 - diagram of the power part of the flyback converter; in fig. 2 - diagram of the power part of the forward converter; in fig. 3 - layout of the power section of a single-cycle flyback voltage converter with galvanic isolation (conditionally top view), in Fig. 4 - layout of the power section of a single-cycle flyback voltage converter with galvanic isolation (conditionally from below), in Fig. 5 - layout of the power section of a single-cycle forward voltage converter with galvanic isolation (conditionally top view), in Fig. 6 - layout of the power section of a single-cycle forward voltage converter with galvanic isolation (conditional view from below).

In FIG. 1-6, the following designations are adopted:

1 - transformer magnetic circuit;

1.1 - primary winding;

1.2 - secondary winding;

2, 3 - input capacitors;

4 - electronic key;

5 - power rectifier;

6, 7 - output capacitors;

8, 9 - bypass rectifiers;

10 - throttle;

11 - polygon connected to the negative pole of the input voltage "-In";

12 - polygon connected to the negative pole of the output voltage "-Out".

In the proposed method of layout of the power part of the voltage converter for the implementation of the power part of single-cycle flyback and forward voltage converters with galvanic isolation, the magnetic circuit of the transformer 1 is used, consisting of a combination of a U-shaped core and a closing plate (U-core + I-core) or two P- shaped cores (UU-core), and the cores of the magnetic circuit of the transformer 1 can be both rectangular and round, and in the general case - sections of arbitrary shape.

On the conditionally upper side of the printed circuit board of the converter (Fig. 3 and 5) are the components of the input (primary) side of its power section.

The input voltage is supplied to the converter through the contacts "+Vx" and "-Vx". The input capacitors 2 and 3, as well as the electronic key 4 are connected to the conductor of the primary winding 1.1 and are located on opposite sides of it.

The input capacitors 2 and 3, as well as the electronic key 4 can be completely or partially located between the rods of the transformer 1, which reduces the area of the input part (dimensions) of the voltage converter.

Outside the area of the magnetic circuit of the transformer 1, there is a polygon 11 connected to a stable negative pole of the input voltage "-Vx". Thus, the noise-emitting switched node of the primary side (primary winding 1.1 and electronic key 4) is located between the rods of the transformer 1, which reduces the radiated radio interference of the converter.

On the conditionally lower side of the printed circuit board of the converter (Fig. 4 and 6) are the components of the output (secondary) side of its power section.

When arranging a flyback voltage converter (Fig. 4), a power rectifier 5, as well as output capacitors 6 and 7, are completely or partially located between the rods of the transformer 1.

Outside the area of the magnetic circuit of the transformer 1 is located landfill 12, connected to a stable negative pole of the output voltage "-Out". Thus, the noise-emitting switched node of the secondary side of the flyback converter (secondary winding 1.2 and power rectifier 5) is also located between the rods of the transformer 1, which reduces the radiated radio interference of the converter.

When assembling a forward voltage converter (Fig. 6), bypass rectifiers 8 and 9 and a choke 10 are added, which are elements of the power section of the forward voltage converter.

The layout of the power section of both versions of the converter is symmetrical with respect to the longitudinal axis of the transformer magnetic circuit in accordance with Fig. 3, 4, 5, 6, which reduces the level of common-mode conducted radio interference produced by the converter.

Claims (2)

1. A method of arranging the power part of a voltage converter containing a transformer magnetic circuit, primary and secondary windings, input capacitors, an electronic key, a power rectifier, output capacitors and polygons connected to the negative poles of the input and output voltage, characterized in that the transformer magnetic circuit is made in the form combinations of a U-shaped core and a closing plate or two U-shaped cores, wherein the primary and secondary windings, the electronic key and the power rectifier are located wholly or partially between the transformer magnetic core rods, and the layout of the converter layout elements is symmetrical relative to the longitudinal axis of the transformer magnetic core. 2. The layout method according to claim 1, characterized in that it contains bypass rectifiers and a choke located symmetrically with respect to the longitudinal axis of the transformer magnetic circuit.

Images