Patent Application
20220192056
The present invention refers to an electronic control of a compressor, more specifically to a compact electronic control and whose disposition of its elements enables efficient thermal dissipation. A compressor and a cooling equipment are also addressed.
Electronic controls are commonly used in the state of the art in the control of compressors applied to cooling equipment. For example, in a variable capacity compressor, the electronic control is, in general terms, responsible for sending commands for altering the rotation speed of the compressor motor and thus enable the temperature of the cooling equipment to be controlled.
One of the problems found in the state of the art lies in the lack of sufficient space for assembling the electronic control and the compressor. So, there is a constant search for a set (electronic control and compressor) of reduced size, obviously provided that efficiency and reliability are not lost.
Besides the reduced space, there are also problems linked to the generation of heat both from the compressor and from its electronic control.
It is known that during the operation of a compressor used in cooling equipment said compressor tends to heat up, said generation of heat may compromise the operation of the electronic control itself of the compressor, compromising the efficiency and reliability of its components (sensitive to temperature).
Similarly, the electronic control itself of the compressor tends to generate heat during its operation, meaning that said energy is absorbed by elements sensitive to temperature and also compromising the operation of the electronic control.
So, the search in the state of the art for a compact electronic control having efficient heat characteristics is ongoing.
From the state of the art related to the present invention, it is known that electronic controls applied to compressors are usually formed by a single printed circuit board endowed with two or more layers, wherein the electronic components are disposed in said layers.
The state of the art also discloses publications wherein the electronic control is formed by a main board associated to auxiliary boards, as described in the prior art US 2018/0287466, wherein a circuit apt to control an electric motor is described. Possibly in an attempt to compact the proposed circuit, said prior art makes use of “daughter” electronic boards associated to a main board, wherein said association occurs by encasement, using the referenced slots for such.
It so happens that said prior art errs by disclosing means for improving the thermal efficiency of the electronic board and electric motor set, which compromises to a great extent the operation of the electric motor associated to the electronic circuit.
Additionally, said prior art shows no concern relating to the form of disposition of the so-called daughter boards in relation to main board, as well as the disposition of the electronic components of each one of the boards.
As seen from the teachings of the present invention, the form of disposition of an electronic control and its components is essential for the compression and thermal efficiency thereof.
The state of the art also discloses prior art EP 1,617,081, describing a compressor wherein the circuit of the inverter (electronic control) is disposed inside the shell of the compressor.
It so happens that said European prior art focuses on the description so that the compressor is apt to carry the inverter inside its shell, such that the inverter is hermetically disposed in the shell of the compressor.
On the other hand, document EP 1,617,081 errs in describing characteristics linked to the disposition of the boards of the inverter as well as forms of overcoming problems related to the dissipation of heat, and these problems definitely occurs when the objective is to dis pose the inverter inside the shell of the compressor, as occurs in EP 1,617,081.
Additionally, document U.S. Pat. No. 6,704,202 discloses a compact-size as well as an inexpensive power controller. Highly heat-dissipating first board including an inverter circuit mounted thereon and second board including a control circuit mounted thereon are placed in parallel with each other and accommodated by case. Case has slits through which heat sink and connector can extend outside case, and further has fixing section for fixing case to a compressor. This structure allows the power controller to dissipate heat in an optimum manner and to be downsized, and also allows the compressor to integrate the controller thereinto. A capacity that the controller occupies in the refrigerating system can be substantially reduced. However, the physical layout of the temperature sensitive components 7 and 54 are in an unfavorable position from the thermal point of view, being subject to heating by both conduction and convection. In opposition, the great benefit of the present invention is the physical distance between heat sources and temperature sensitive components, improving the reliability of the product.
Document US2005/219827 discloses an electrical circuit device that includes a controller, drivers, auxiliary plates, and a case. The controller inputs driving signals to the drivers. The drivers have multiple semiconductor relays that turn on and off power supply to electrical loads based on the driving signals. The drivers are housed in the case. The driving signals are transmitted from the controller to the drivers via serial communication. With this configuration, the number of communication lines and the communication connectors and the size of the electrical circuit device are small with respect to parallel communication. When another driver is added, only software modification of the controller and addition of a serial communication line between the controller and the driver are required. Thus, the electrical circuit device can be easily modified for different models of vehicles. However, in opposition, the use of auxiliary plates is not the focus of the present invention. The present invention aims to protect the arrangement of these plates, offering the best thermal management.
Further, document US 2015/216089 discloses a control circuit with a power module fixed closer to a side wall of the casing than other circuit boards which produce less heat. This document addresses a liquid circulation cooling structure. This structure has several heat generating bodies, which are cooled by the same cooling body (metallic heatsink). However, in opposition, the present application does not require the cooling of different plates, but the thermal management between heat sources and sensitive components.
The present invention is intended to overcome the problems existing in the state of the art by way of an electronic control whose disposition of its boards enables due compacting as well as efficient thermal dissipation.
More specifically, the present invention presents an electronic control wherein the thermally most sensitive components are set aside from those components that generate more heat, therefore, the efficiency and reliability of the electronic control will not be compromised.
Additionally, the electronic control proposed in the present invention makes use of auxiliary boards associated to a main board, wherein the form of association proposed between the auxiliary boards and the main board boosts the compaction of the electronic control that is the object of the present invention.
The advantages obtained from the teachings of the present invention will be addressed in detail during the course of the present specification.
The objective of the present invention is to provide an electronic control of a compressor, wherein the electronic control is formed by a main electronic board and by at least an auxiliary electronic board.
Another objective of the present invention is to provide an electronic control whose disposition enables heat-generating elements of the electronic control to be set aside from the elements sensitive to temperature.
An additional objective of the present invention lies in providing an electronic control wherein one of its electronic boards is a board that concentrates most of the heat-generating elements, wherein the disposition of the heat-generating board in the electronic control enables improved dissipation of the heat generated by said board.
It is also an objective of the present invention to provide an electronic control wherein the heat-generating board is disposed at a first distance in relation to a wall of an encasement, wherein the other auxiliary boards are disposed at a second distance from this same wall, wherein the first distance is less than the second distance.
An additional objective of the present invention lies in providing an electronic control wherein an operation face of the heat generating board faces (towards) a first wall of the encasement, such that the operation face of the other auxiliary boards faces a second wall of the encasement, such that the first wall is opposite the second wall.
It is also an objective of the present invention to provide an electronic control endowed with a main board and three auxiliary boards.
Another objective of the present invention is to provide an electronic control wherein the association of the auxiliary boards to the main board occurs by way of a soldering process.
An additional objective of the present invention consists of providing a compressor and a cooling equipment, the compressor comprising the electronic control defined in the present invention.
It is a further objective of the present invention to provide a cooling equipment endowed with the electronic control proposed in the present invention.
The objectives of the present invention are achieved by way of an electronic control of a compressor, the electronic control disposed in an encasement and comprising a main board associated to at least an auxiliary board, wherein one of the auxiliary boards is a heat generating board, wherein the heat-generating board is disposed at a first distance in relation to a first wall of the encasement, this first wall being related to the upper part of the encasement considering the final position of application of the electronic control, and the other auxiliary boards are disposed at least at a second distance in relation to the first wall of the encasement, wherein the first distance is less than the second distance.
The present invention will now be described in greater detail based on an exemplary embodiment represented in the drawings. The figures show:
The present invention initially describes an electronic control 1, as can be seen from
In a fully valid embodiment of the present invention, said electronic control 1 can be applied to the control of a compressor 2, more specifically, the electronic control 1 can be used to control the speed of the electric motor of the compressor 2.
In any case, it is emphasized that the application of the electronic control 1 for the control of a compressor 2 should not be considered as a limitative characteristic of the present invention, such that the electronic control 1 proposed herein could very well be used in various other applications, such as the control of motors in general and integrated controls for compressor and refrigerator.
In a valid embodiment of the present invention and in reference to
In any case, the application of the teachings of the present invention to a cooling equipment should not be considered as a limitative characteristic of the invention.
For due packaging and protection of the electronic control 1, it is proposed that it be disposed in an encasement 3, as represented in
It is emphasized that the illustration of the encasement 3 in the figures in question should not be considered as a limitative characteristic of the present invention, such that encasement 3 should be understood to be any element able to offer protection to the electronic control 1, and encasement 3 can also be understood to be any site for storing the control 1, such as a plastic box, metal box, any type of cabinet, the very shell of the compressor, among others.
In this embodiment of the present invention illustrated in
In reference to
In this embodiment of the present invention, it is proposed that three auxiliary boards 5, 6 and 7 be used, as represented in
The auxiliary electronic boards 5, 6 and 7 can be respectively understood as a first auxiliary board 5, a second auxiliary board 6 and a third auxiliary board 7.
It is also understood that the main board 4 and each one of the auxiliary boards 5,6 and 7 comprises an operation face 4a, 5a, 6a, 7a and a track face 4b, 5b, 6b, 7b.
In specific reference to
So,
The track face 4b, 5b, 6b, 7b should be understood as the face opposite the operation face 4a, 5a, 6a, 7a, so the track face 4b, 5b, 6b, 7b can be understood as the face that comprises most of the conducting tracks of the board. In any case, it is emphasized that the track face 4b, 5b, 6b, 7b may also contain some electronic components 8 on its surface.
Generally speaking, the operation face 4a, 5a, 6a, 7a can be understood as the face preferably used for housing the electronic components 8, while the track face 4b, 5b, 6b, 7b can be understood as being the preferred face for disposing the conducting tracks, the track face 4b, 5b, 6b, 7b may also contain electronic components 8.
Further and considering that a certain electronic component 8 is fastened to the main board 4 by means of a soldering process, the track face 4b can be understood as a face wherein the soldering points are visible.
Generally speaking, the track face should be understood as the face opposite the face that comprises most electronic components 8.
In this sense,
From the teachings described above, it is understood that
An important characteristic of the electronic control 1 proposed in the present invention lies in the disposition and arrangement of the main electronic board 4 in addition to the auxiliary boards 5, 6, and 7. More specifically, it is proposed that each auxiliary board 5, 6 and 7 as well as the main board 4 represents a certain operation block of the electronic control, wherein each operation block will comprise the specific and necessary electronic components for the operation of said block.
Further, and as described in detail ahead, the disposition site and arrangement of the auxiliary boards 5, 6 and 7 and main board 4 (and its operation blocks) also refer to an important characteristic of the present invention.
The main electronic board 4 can be understood as a mother board that concentrates all the PTH (pin through hole components of the electronic control 1, that is, those electronic components 8 whose terminals are inserted into the holes (orifices) of the electronic board 4 and are then fastened thereto, for example, by means of soldering.
In this embodiment of the present invention, the electronic board 4 comprises the following electronic components 8: connectors, EMC filter, fuse, rectifier diodes, busbar capacitors, cables, jumpers, besides obviously comprising the auxiliary boards 5, 6 and 7 as well.
So, the main board 4 can be understood as a fastening block, and this block is responsible for concentrating the PTH components of the electronic control 1, as described previously.
Similarly, the present invention proposes that the first auxiliary electronic board 5 be configured as a power block, more specifically, the electronic board 5 can be understood as an SMPS board (switched mode power supply), thus being responsible for providing low-voltage power to the other boards of the product.
Therefore, and in a configuration of the present invention, the auxiliary electronic board 5 comprises the following electronic components 8: integrated SMPS circuit, inductor, voltage regulator, capacitors, diodes, and resistors.
Configuring the first auxiliary board 5 in a power block, as proposed, it is entirely possible to design various auxiliary boards 5 with different efficiencies, such that for each type of application desired, an auxiliary board 5 with the desired efficiency can be used.
So, if there is a need to change the efficiency of the electronic control 1, there is the possibility of replacing just the auxiliary board 5, not making any alteration to the main board 4 or to the other auxiliary boards 6 and 7 either.
Similarly to that described above, the second auxiliary board 6 represents a control block of the electronic control 1. More specifically, the auxiliary board concentrates the opto-communication couplers, microprocessor, microcontroller and its peripherals.
Therefore, it is possible to design only a new auxiliary board 6 if it is desirable to alter the microcontroller/microprocessor of the electronic control 1, thus not affecting the other boards of the control 1. Similarly, should the need for repair and/or replacement arise, it is possible to substitute only the second board 6, which ends up significantly reducing the costs involved.
The third auxiliary board 7 acts as a block inverter, said board 7 comprising the electronic keys responsible for driving the electric motor of the compressor 2, and also for comprising drivers and peripheral circuits of the electronic control 1.
Therefore, and for effectively concentrating the components necessary for the operation of the electric motor of the compressor 2, the block inverter (third board 7) is understood to be the one that generates most heat in the electronic control 1. Put otherwise, when compared to the other boards of the electronic control 1 (main board 4 and auxiliary boards 5 and 6), the third auxiliary board 7 is the one that generates most heat (coming essentially from the operation of the electronic keys), and can thus be understood as a heat-generating board.
Therefore, heat-generating board 7 should be understood to be the board of the electronic control 1 that generates most heat.
Considering the block inverter (third auxiliary board 7) as the one that generates most heat in the electronic control 1, the disposition and arrangement of the auxiliary boards 5, 6 and 7 assumes an important characteristic in the electronic control 1 proposed in the pre sent invention.
Specifically, and viewing the best possible thermal performance for the electronic control 1, this embodiment of the present invention proposes that a heat-generating board 7 be distanced from the other components of the control 1, especially those components most sensitive to temperature. In an embodiment of the present invention, components most sensitive to temperature can be understood as the busbar capacitor 80 disposed on the main board 4, the capacitor 80′ disposed on the first auxiliary board 5 and the microprocessor 80″ dis posed on the second auxiliary board 6, as represented in
As already described previously, it is proposed that the electronic control 1 be disposed in an encasement 3, such that said encasement should be associated to the compressor 2, according to the illustration in
Providing important thermal advantages for the electronic control 1 described in the present invention, it is proposed that the board generating most heat in the control 1, that is, the third auxiliary board 7 be distanced from the other boards of the electronic control 1.
Therefore, the present invention proposes that the heat generating board 7 be disposed at a first distance Di in relation to the first wall of the encasement Pi, reference is made to
As illustrated in
Another important characteristic of the electronic control 1 proposed herein and viewing efficient thermal dissipation of the heat generated chiefly on the third auxiliary board 7, it is proposed that the operation face 7a of the heat-generating board 7 faces the first wall of the encasement Pi, as represented in
So “to face” means that the operation face 7a of the heat generating board 7 faces towards the first wall Pi, as represented in
Similarly, and still in reference to
More specifically, and still in reference to
This form of disposition guarantees that the thermally most sensitive components, such as the busbar electrolyte capacitor 80 disposed on the main board 4, the microprocessor 80″ disposed on the auxiliary board 6 and the electrolyte capacitor 80′ disposed on the auxiliary board 5 will undergo significantly less interference from the heat generated by the third auxiliary board 7, thus improving the efficiency and reliability of the electronic control 1.
Further in relation to the disposition and arrangement proposed for the electronic control 1, it is noted that the operation face 4a of the main board 4 faces a third wall P3 of the encasement, the third wall P3 being adjacent to the first wall Pi and the second wall P2, as illustrated in
The disposition of the electronic components 8 of the mother board on a lateral plane to the body of the compressor, as described above, hinders the thermal exchange with the environment via convection, which ultimately boosts the operation of the electronic control 1, since the main board 4 is the one that comprises one of the components 8 most sensitive to temperature (busbar capacitor 80).
Therefore, the disposition proposed ends up distancing the heat-generating board 7 of the thermally most sensitive components and which are disposed on the main board 4, in other words, with the arrangement in question the auxiliary boards 5 and 6 act as a shield, thus protecting the thermally most sensitive components and which are disposed on the main electronic board 4.
Furthermore, the proposal in question of disposition of the heat-generating board 7, such that its operation face 7a faces the first wall Pi ultimately improves the thermal efficiency of the system. In a non-limitative manner, the first wall Pi should be understood as the upper wall of the encasement 3 which stores the electronic control 1, the electronic control 1 and the encasement 3 being mounted in their final use position. This final use position is illustrated in
In this sense, and with a view to further boost the characteristics linked to the thermal dissipation of the electronic control 1, it is proposed that the first wall Pi of the encasement 3 comprise a heat dissipator 10, as represented in
Generally speaking, the heat dissipator 10 can be under stood as a board made of metal material, such as aluminum, the objective of which is to transfer the heat generated by the third auxiliary board 7 directly to the environment.
In one configuration, the very wall of the encasement (first wall Pi) may configure the heat dissipator 10, so it is understood that the very wall Pi can be made of metal material, thus acting as the heat dissipator 10. In another fully valid configuration, the heat dissipator 10 can be associated to the first wall Pi, and said wall may be made of any material, such as a polymer material.
Furthermore, and in reference to
It is emphasized that the form and the disposition site of the conducting adhesive 9, as represented in
In a non-limitative characteristic of the present invention, it is proposed that the association between the auxiliary boards 5, 6 and 7 and the main board occur by way of a soldering process. Preferably, said association occurs by way of a wave soldering process which results in an electronic control 1 endowed with sufficient mechanical stress and vibration.
In any case, it is emphasized that in the use of the soldering process, the wave should not be considered as a limitation of the pre sent invention, to the extent that other forms of association would be fully acceptable, such as the use of selective soldering or soldering by robot.
So what is proposed here is an electronic control wherein the auxiliary boards 5, 6 and 7 are disposed concurrently to the main electronic board 4, that is, it is understood that the plans defined by each one of the auxiliary boards 5, 6 and 7 are concurrent to the plane defined by the main board 4, as represented in
In a non-limitative characteristic of the present invention, and as represented in
In another valid configuration, at least one of the auxiliary boards 5, 6 and 7 could be disposed perpendicularly in relation to the main board 4, such that the other boards of the electronic control could be disposed slantedly in relation to the board 4.
Furthermore, the disposition of the auxiliary boards 5, 6 and 7 in parallel to each other should not represent a limitation of the present invention either.
So, what is proposed is an electronic control 1 with efficient operation and excellent thermal and electromagnetic characteristics, also being compact, able to be disposed in an encasement 3 with dimensions preferably in the range of 120 (L)×90 (A)×45 (P) mm.
Further, and without entailing limitations to the teachings of the present invention, it is proposed that the main board 4 be configured as a single layer board and as daughter boards 5, 6 and 7 be con figured as dual layer boards, that is, boards that enable the disposition of electronic components on the two faces of the board. It is under lined that this characteristic does not refer to a limitation of the present invention.
The present invention further proposes a compressor 2 used in a cooling equipment, wherein the compressor 2 comprises an electronic control 1 as previously described.
Lastly, a cooling equipment is further proposed, endowed with an electronic control 1 as proposed in the present invention.
Having described an example of a preferred embodiment, it should be understood that the scope of the present invention encompasses other possible variations, being limited solely by the content of the accompanying claims, potential equivalents being included therein.
| Number | Date | Country | Kind |
|---|---|---|---|
| BR102019006685-7 | Apr 2019 | BR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/BR2020/050074 | 3/9/2020 | WO | 00 |
