RU2498544C2 - Radio-electronic unit - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: radio-electronic unit has a housing and functional cells having printed-circuit boards with radio elements and heatsinks. According to the invention, the housing is made of dielectric material in form of a continuous structure with inner partition walls which form compartments accommodating the functional cells, wherein the central compartment of the housing accommodates a transformer board, having four paired pulse transformers with symmetrical arrangement of windings; at opposite sides of the transformer board there are four functional cells at each side, each placed in a separate compartment of the housing and representing a transistor unit, having two printed-circuit boards connected by insulating bars with threaded openings for mounting into the housing, wherein the first printed-circuit board has three clamp diodes and the second printed-circuit board has a high-voltage power transistor. The second printed-circuit board is double-sided and has areas with the same shape as the transistor housing on two sides and has metal-coated openings which the heatsink function as heat-removing pipes.

EFFECT: high efficiency of cooling powerful radio elements and reliability, improved weight and size characteristics.

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Description

The invention relates to electronics and can be used in blocks of electronic equipment to improve the cooling efficiency of powerful radioelements.

Known radio-electronic unit [1], consisting of a housing made in the form of a rectangular parallelepiped with heat-exchange walls, subunits of which are made in the form of printed circuit boards with electric radio elements and with counterparts of electrical connectors on one of the end sides, functional cells that are installed in the housing with the possibility providing contact clamping elements of thermal contact of at least two other end faces of their printed circuit boards of subunits with corresponding adjacent heat exchangers the walls of the housing and electrically connected to the body panel with their mates. The heat transfer walls of the casing are made in the form of hollow chambers with internal partitions communicating with each other by their cavities with the cavity of the casing by means of ventilation holes. Moreover, each hollow chamber with partitions is formed by a profiled sheathing of sheet material. Contact heat-conducting clamping elements are made in the form of wedge-shaped spring thermal connectors from curved plates, the protruding parts of which are located on the respective end faces of the printed circuit boards of the subunits, and the mating parts corresponding to them are located on the corresponding adjacent printed circuit boards on their inner surfaces of the heat transfer walls of the housing. The panel has a hinge with electrical connectors.

The disadvantages of the known block are the small geometric size of the thermal contact, due to their location at the ends, the complexity of the thermal connector made in the form of wedge-shaped spring thermal connectors, the insufficient thermal contact of the thermal connector due to the complex conjugation of the corner surfaces, which affects the low cooling efficiency.

Closest to the proposed technical solution is a radio-electronic unit [2], containing a housing and functional cells, which are heat sinks with glued to them printed circuit boards with electronic components. Each heat sink base is made with lower and side heat sinks, the base of each cell is additionally equipped with an upper heat sink, and the walls of the body are formed tightly pressed against each other and fastened together by the end surfaces of the same heat sinks of neighboring cells.

The disadvantages of the prototype device are the low reliability, large mass and volume of the electronic unit.

The objective of the invention is improving reliability, improving the overall dimensions of the electronic unit.

The problem is achieved in that in a radio-electronic unit containing a housing and functional cells containing printed circuit boards with radio elements and heat sinks, according to the invention, the housing is made of dielectric material in the form of an integral structure with internal partitions forming cavities into which the functional cells are located, and the central cavity of the housing is a transformer board containing four paired pulse transformers with a symmetrical arrangement of windings, with opposite Four functional cells are located on the sides of the transformer board, each of which is located in a separate cavity of the case and represents a transistor block containing two printed circuit boards connected with insulating posts to threaded holes used for fastening into the case, while on the first printed circuit board three restriction diodes are installed, and a high-voltage transistor is mounted on the second printed circuit board, the second printed circuit board made double-sided with polygons repeating the shape of the trans torus on both sides and contains about 100 metallized holes that perform the function of heat sink as heat sink tubes.

Figure 1 shows the design of the proposed electronic unit, including a housing 1 and functional cells 2, a transformer board 3, containing four paired pulse transformers 4 with a symmetrical arrangement of windings. On the opposite sides of the transformer board 3, four functional cells 2 are placed along the perimeter of the housing 1, each of which contains two printed circuit boards connected by means of insulating posts 6 with threaded holes used for fastening into the housing 1. Three are installed on the first printed circuit board 7 restrictive diode 8, and on the second printed circuit board 9 a high-voltage transistor 10. The second printed circuit board 9 is made double-sided with polygons 11 repeating the shape of the transistor housing on both sides and contains about 100 metal zirovannyh holes 12, performing the function of heat sink as heat sink tubes. Figure 2 presents the design of the transistor block.

The proposed device operates as follows. To ensure electrical insulation strength of more than 10 kV, the design of the proposed electronic block is made in a block-modular manner in a rectangular one-piece housing 1 made of dielectric material with partitions forming cavities inside the housing 1. In the central cavity of the housing 1 there is a transformer board 3, on which four paired pulse transformer 4, made with a symmetrical arrangement of the windings. Along the perimeter of the housing 1, on opposite sides of the transformer board 3, in the peculiar cells formed by the cavities of the housing 1, there are 8 transistor blocks representing functional cells 2. The electric potential between adjacent transistor blocks is 1/8 of the maximum value. Such a division of the circuit into 8 cells reduces the operating voltage in one individual transistor unit to values that allow it to be performed on the basis of a printed circuit.

The transistor block represents a module (whatnot), consisting of two printed circuit boards. Both boards are connected to the unit using insulating posts 6 with threaded holes for mounting in the housing of the electronic unit. Three restriction diodes 8 are installed on the first printed circuit board 7, and a high-voltage transistor 10 is installed on the second 9. holes 12 as heat sink tubes. The use of metallized holes made it possible to abandon the metal radiator and significantly reduce the dimensions of the block. The electrical installation between the boards and between adjacent transistor blocks is made of copper wire in a fluoroplastic insulating tube. High-potential input and housing circuits are spaced apart from each other by a considerable distance, because located at opposite ends of the housing.

Information sources

1. Patent No. 1512469 of the Russian Federation, H05K 7/20, publ. 09/27/2000.

2. Patent No. 2323277 of the Russian Federation, H05K 7/20, publ. 04/20/2008.

Claims (1)

A radio electronic unit comprising a housing, a lid and functional cells comprising printed circuit boards with radioelements and heat sinks, characterized in that the housing is made of dielectric material in the form of an integral structure with internal partitions forming cavities into which the functional cells are located, and in the central cavity of the housing a transformer board is located, containing four paired pulse transformers with a symmetrical arrangement of windings, on opposite sides of the transformer board four functional cells are located, each of which is located in a separate cavity of the case and represents a transistor unit containing two printed circuit boards connected by means of insulating racks with threaded holes used for fastening into the case, while three limiting diodes are installed on the first printed circuit board, and the second printed circuit board has a high-voltage transistor, and the second printed circuit board is double-sided with polygons repeating the shape of the transistor case on both sides and contains about 10 0 metallized holes that perform the function of heat sink as heat sink tubes.

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