Active filter

Abstract

The invention discloses an active filter, which belongs to the technical field of power electronics and comprises a radiator, a power board and an inductance board are arranged side by side on one side of the radiator opposite to the radiating direction, a control board is vertically inserted on the power board, and the inductance board is inversely buckled on the radiator. Compared with the prior art, the height in the installation space of the active filter can be effectively utilized through the arrangement mode, so that the structure of each component in the active filter is more compact, and the space volume occupied by the active filter can be further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to an active filter. Background Art

[0002] The harm of harmonics is very serious. Harmonics not only reduce the efficiency of electric energy use, cause electrical equipment to malfunction or burn, but also affect the communication function of electronic equipment. Active Power Filter (APF) is a power electronic device that can dynamically suppress harmonics and perform reactive power compensation for harmonics. It can quickly track and compensate for harmonics of different frequencies and eliminate the harm caused by harmonics. Therefore, active filters have been widely used in real life.

[0003] However, in the prior art, all the related components in the active filter are assembled in a flat manner, which results in a larger space occupied by the active filter. Currently, there is no effective solution to this technical problem.

[0004] It can be seen that how to further reduce the space volume occupied by the active filter is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an active filter to solve the technical problem that the active filter in the prior art occupies a large space volume. The specific scheme is as follows:

[0006] In order to solve the above technical problems, the present invention provides an active filter, comprising: a radiator, wherein a power board and an inductor board are arranged side by side on the side of the radiator facing away from the heat dissipation direction, a control board is vertically inserted on the power board, and the inductor board is inverted on the radiator.

[0007] Preferably, a waterproof adhesive strip is attached to the radiator.

[0008] Preferably, the power board is disposed on the heat sink via a first spacer column, and the inductor board is buckled onto the heat sink via a second spacer column.

[0009] Preferably, the inductor coil on the inductor board is attached to the heat sink via a silicone sheet.

[0010] Preferably, a flange is provided at the edge of the radiator.

[0011] Preferably, the heat sink, the power board, the control board and the inductor board are all accommodated in a shell, and a detachable shell cover is also provided on the shell.

[0012] Preferably, a first fan group is arranged in the housing, and an air outlet of the first fan group faces the heat sink of the radiator.

[0013] Preferably, a second fan group is arranged in the shell, and an air outlet of the second fan group faces away from the inductor coil of the inductor board.

[0014] Preferably, a capacitor plate is mounted inside the shell, and the capacitor plate is inverted inside the shell.

[0015] Preferably, the capacitor plate is electrically connected to the power board, the control board, the inductor board and the heat sink through a copper busbar.

[0016] It can be seen that the active filter provided by the present invention includes: a radiator, a power board and an inductor board are arranged side by side on the side of the radiator facing away from the heat dissipation direction, a control board is vertically inserted on the power board, thereby reducing the space occupied by the control board on the power board, and the inductor board is arranged upside down on the radiator, because the inductor occupies a smaller area than the inductor board, so the area occupied by the power board and the inductor board on the plane is further reduced. Compared with the prior art, such a setting method can effectively utilize the height in the installation space of the active filter, so that the structure of each component in the active filter can be made more compact, thereby further reducing the space volume occupied by the active filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A structural diagram of an active filter provided by an embodiment of the present invention;

[0019] Figure 2 A structural diagram of another active filter provided by an embodiment of the present invention;

[0020] Figure 3 A structural diagram of another active filter provided by an embodiment of the present invention;

[0021] Figure 4 A working principle diagram of an active filter provided by an embodiment of the present invention.

[0022] Figures 1 to 3 The reference numerals in the figures are as follows:

[0023] 11 is a radiator, 12 is a power board, 13 is an inductor board, 14 is a control board, 121 is a first spacer column, 131 is a second spacer column, 132 is an inductor coil, 133 is a silicone sheet, 111 is a flange provided on the radiator 11, 15 is a shell, 16 is a shell cover, 151 is a flange provided on the shell 15, 17 is a first fan group, 18 is a second fan group, 19 is a capacitor plate, 191 is a screw hole provided on the capacitor plate 19, and 192 is a screw hole provided on the shell 15. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 , Figure 1 A structural diagram of an active filter provided in an embodiment of the present invention, the active filter comprises: a radiator 11, a power board 12 and an inductor board 13 are arranged side by side on the side of the radiator 11 facing away from the heat dissipation direction, a control board 14 is vertically inserted on the power board 12, and the inductor board 13 is inverted on the radiator 11.

[0026] In the active filter provided in this embodiment, a heat sink 11, a power board 12, an inductor board 13 and a control board 14 are provided. The power board 12 and the inductor board 13 are arranged side by side on the side of the heat sink 11 facing away from the heat dissipation direction, the control board 14 is vertically inserted on the power board 12, and the inductor board 13 is arranged upside down on the heat sink 11.

[0027] Specifically, the control board 14 can be vertically inserted on the power board 12 by pin welding, and the power board 12 and the inductor board 13 can be arranged side by side on the radiator 11 by means of spacer columns. It can be imagined that by vertically inserting the control board 14 on the power board 12 and invertedly arranging the inductor board 13 on the radiator 11, the height in the installation space of the active filter can be effectively utilized, so that the structure of each component in the active filter can be made more compact, thereby further reducing the space volume occupied by the active filter.

[0028] It can be imagined that when the power board 12 and the inductor board 13 are arranged side by side on the radiator 11, the control board 14 is inserted vertically on the power board 12, and the inductor board 13 is buckled on the radiator 11, it is equivalent to staggering the components in the active filter. In this arrangement, the space volume occupied by the active filter can be effectively reduced. Moreover, through such an arrangement, the material cost required for the active filter can also be reduced.

[0029] It should be noted that, since the active filter provided in this embodiment adopts a split installation method, and the power board 12, the inductor board 13 and the control board 14 in the active filter are made into three boards respectively, this is more conducive to the research and development and upgrading of the active filter in the subsequent process. In addition, in practical applications, when the inductor board 13 in the active filter is removed, the active filter can also be used as a three-phase synchronous rectifier.

[0030] It can be seen that the active filter provided in this embodiment includes: a radiator, a power board and an inductor board are arranged side by side on the side of the radiator facing away from the heat dissipation direction, a control board is vertically inserted on the power board, thereby reducing the space occupied by the control board on the power board, and the inductor board is arranged upside down on the radiator, because the inductor occupies a smaller area than the inductor board, so the area occupied by the power board and the inductor board on the plane is further reduced. Compared with the prior art, such a setting method can effectively utilize the height in the installation space of the active filter, so that the structure of each component in the active filter can be made more compact, thereby further reducing the space volume occupied by the active filter.

[0031] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. As a preferred implementation, a waterproof adhesive strip is attached to the radiator 11 .

[0032] In practical applications, in order to ensure the safety and reliability of the active filter during operation, a waterproof adhesive strip may be attached to the radiator 11 to ensure the waterproof performance of the active filter. In this arrangement, the active filter can be installed as a whole in the electric control box to meet the use of more application scenarios. In addition, when the active filter is installed as a whole in the electric control box, the space occupied by the electric control box can be further reduced.

[0033] In addition, when a waterproof adhesive strip is attached to the radiator 11, when the active filter is installed in the electric control box, it is not necessary to consume a large amount of glue to waterproof and reinforce the active filter, which also makes it easier for the staff to maintain and repair the active filter in the later stage.

[0034] Obviously, the technical solution provided by this embodiment can further improve the waterproof performance of the active filter.

[0035] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 2 , Figure 2 This is a structural diagram of another active filter provided by an embodiment of the present invention. As a preferred implementation, the power board 12 is disposed on the heat sink 11 through a first spacer 121 , and the inductor board 13 is buckled on the heat sink 11 through a second spacer 131 .

[0036] In this embodiment, the power board 12 is arranged on the heat sink 11 through the first spacer 121, and the inductor plate 13 is buckled on the heat sink 11 through the second spacer 131. Among them, the second spacer 131 is higher than the first spacer 121. It can be imagined that since the cost of the spacer is low and the space occupied is small, when the power board 12 is arranged on the heat sink 11 through the first spacer 121, and the inductor plate 13 is buckled on the heat sink 11 through the second spacer 131, not only the design cost of the active filter can be reduced, but also the space volume occupied by the active filter can be reduced.

[0037] Obviously, the technical solution provided by this embodiment can further reduce the design cost and floor space of the active filter.

[0038] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 2 , Figure 2 This is a structural diagram of another active filter provided by an embodiment of the present invention. As a preferred implementation, the inductor coil 132 on the inductor plate 13 is attached to the heat sink 11 via a silicone sheet 133 .

[0039] It is understandable that, during the operation of the active filter, the inductor 132 on the inductor board 13 will inevitably emit heat. If the temperature of the inductor 132 is too high, it may sometimes affect the safe and stable operation of the active filter. In this embodiment, in order to dissipate the heat of the inductor 132, a silicone sheet 133 is provided at the bottom of the inductor 132, and the heat emitted by the inductor 132 is introduced into the radiator 11 through the silicone sheet 133, and the heat of the inductor 132 is dissipated through the radiator 11, thereby achieving the purpose of reducing the temperature of the inductor 132.

[0040] Obviously, the technical solution provided by this embodiment can ensure the safe and stable operation of the active filter.

[0041] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 2 , Figure 2 This is a structural diagram of another active filter provided by an embodiment of the present invention. As a preferred implementation, a flange 111 is provided at the edge of the heat sink 11 .

[0042] In this embodiment, in order to integrate the radiator 11, the power board 12, the inductor board 13 and the control board 14 as a whole in the electric control box, a flange 111 is further provided at the edge of the radiator 11. Specifically, in this embodiment, eight screw holes are provided on the flange 111 at the edge of the radiator 11, so that the active filter can be locked in the electric control box by screws matched with the screw holes, and the active filter can be applied to more practical scenarios.

[0043] Obviously, the technical solution provided by this embodiment can make it easier to integrate the active filter into the electronic control device.

[0044] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of another active filter provided by an embodiment of the present invention. As a preferred implementation, the heat sink 11, the power board 12, the control board 14 and the inductor board 13 are all accommodated in a housing 15, and a detachable housing cover 16 is also provided on the housing 15.

[0045] In this embodiment, a housing 15 may be further provided on the active filter, and the heat sink 11, the power board 12, the control board 14 and the inductor board 13 may be accommodated in the housing 15, so as to prevent debris such as flying chips and dust from falling on the active filter, thereby not affecting the normal use of each circuit board in the active filter.

[0046] In actual use, a flange 151 may be provided at the edge of the housing 15, so that when the active filter is used, the active filter can be locked on the application equipment through the screw holes on the flange 151 at the edge of the housing 15. Afterwards, the housing cover 16 of the active filter is opened, the power supply cable and the active filter are connected, and the housing cover 16 of the active filter is covered again, and the active filter can be used to suppress the harmonics generated by the application equipment.

[0047] Obviously, the technical solution provided by this embodiment can further broaden the application scope of the active filter.

[0048] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 3 , Figure 3A structural diagram of another active filter provided by an embodiment of the present invention. As a preferred implementation, a first fan group 17 is disposed in the housing 15 , and an air outlet of the first fan group 17 faces the heat sink 112 of the heat sink 11 .

[0049] In order to improve the fan heat efficiency of the radiator 11 in the active filter, a first fan group 17 may be arranged in the housing 15 of the active filter, and the air outlet of the first fan group 17 faces the heat sink 112 of the radiator 11. It can be imagined that, through such an arrangement, the radiator 11 can be better cooled, thereby ensuring the safe and stable operation of the active filter.

[0050] As a preferred implementation, a second fan group 18 is disposed in the housing 15 , and an air outlet of the second fan group 18 faces away from the inductor coil 132 of the inductor plate 13 .

[0051] It is conceivable that during the operation of the active filter, the inductor coil 132 on the inductor plate 13 inside the active filter will emit a large amount of heat. In order to improve the heat dissipation efficiency of the inductor coil 132 on the inductor plate 13, a second fan group 18 can be arranged in the housing 15, and the air outlet of the second fan group 18 is directed away from the inductor coil 132 of the inductor plate 13, so as to achieve the effect of exhausting air. It is worth noting that in actual applications, the air outlet directions of the first fan group 17 and the second fan group 18 need to be consistent, so that the heat dissipation efficiency of the active filter can be further improved.

[0052] As a preferred implementation, a capacitor plate 19 is mounted inside the housing 15 , and the capacitor plate 19 is inverted inside the housing 15 .

[0053] In order to improve the working efficiency of the active filter, a capacitor plate 19 can also be set in the active filter. In addition, in order to further reduce the space volume occupied by the active filter, the capacitor plate 19 can be set in the shell 15 of the active filter, and the capacitor plate 19 can be inverted in the shell 15, so that the space in the shell 15 can be utilized to the greatest extent.

[0054] Specifically, in practical applications, a screw hole 191 may be provided on the capacitor plate 19, and a screw hole 192 may be provided on the housing 15. At this time, the capacitor plate 19 may be mounted in the housing 15 of the active filter by means of screws. Alternatively, the capacitor plate 19 may be buckled upside down in the housing 15 of the active filter by means of snaps. In addition, in practical applications, the capacitor plate 19 is electrically connected to the power board 12, the control board 14, the inductor board 13, and the radiator 11 through a copper busbar.

[0055] Obviously, the technical solution provided by this embodiment can further improve the space utilization rate in the active filter housing.

[0056] Based on the contents disclosed in the above embodiments, the working principle of the active filter is specifically described here through an application scenario embodiment. Figure 4 , Figure 4 A working principle diagram of an active filter provided by an embodiment of the present invention.

[0057] When the grid 21 is to supply power to the load 23, a part of the AC power in the grid 21 will be filtered through the inductor 22 and supply power to the load 23. Another part of the AC power in the grid 21 will enter the active filter 10 through the inductor plate 13 in the active filter 10 when the active filter 10 is powered on. When the AC power enters the active filter 10 through the inductor plate 13, the AC power will transmit energy to the power board 12 through the spacer column; then, the power board 12 will convert the AC power into DC power and transmit it to the control board 14. After the control board 14 divides the DC power through the auxiliary power supply, it will power the MCU (Micro Controller Unit) in the control board 14. After the MCU works, it will control the relay action of the pre-charging module on the power board 12 to end the pre-charging action, and control the active filter 10 to start normal operation.

[0058] When the active filter 10 starts to work normally, the power board 12 in the active filter 10 will sample the AC current in the power grid 21, and send the sampled current signal to the control board 14 for processing. After the control board 14 processes the AC through the control algorithm set inside it, the control board 14 will transmit the control signal for eliminating harmonics to the power board 12, and control the power devices inside the power board 12; finally, the power board 12 will feed back the current with the same harmonic amplitude and opposite polarity to the power grid 21, and offset the harmonic current in the power grid 21. Obviously, the purpose of eliminating harmonics in AC can be achieved through the active filter 10, thereby ensuring the safe and reliable operation of the load.

[0059] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements that are not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0060] An active filter provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An active filter, characterized in that: include: A radiator (11), wherein a power board (12) and an inductor board (13) are arranged side by side on a side of the radiator (11) that faces away from the heat dissipation direction, a control board (14) is vertically inserted on the power board (12), and the inductor board (13) is inverted on the radiator (11).

2. An active filter according to claim 1, characterized in that: A waterproof adhesive strip is attached to the radiator (11).

3. An active filter according to claim 1, characterized in that: The power board (12) is arranged on the heat sink (11) via a first spacing column (121), and the inductor board (13) is buckled onto the heat sink (11) via a second spacing column (131).

4. The active filter according to claim 1, characterized in that: The inductor coil (132) on the inductor plate (13) is bonded to the heat sink (11) via a silicone sheet (133).

5. The active filter according to claim 1, characterized in that: A flange (111) is provided at the edge of the radiator (11).

6. An active filter according to claim 1, characterized in that: The heat sink (11), the power board (12), the control board (14) and the inductor board (13) are all accommodated in a housing (15), and a detachable housing cover (16) is also provided on the housing (15).

7. An active filter according to claim 6, characterized in that: A first fan group (17) is arranged in the housing (15), and an air outlet of the first fan group (17) faces the cooling fins of the radiator (11).

8. An active filter according to claim 6, characterized in that: A second fan group (18) is arranged in the housing (15), and an air outlet of the second fan group (18) faces away from the inductor coil (132) of the inductor plate (13).

9. An active filter according to any one of claims 6 to 8, characterized in that: A capacitor plate (19) is mounted inside the housing (15), and the capacitor plate (19) is inverted inside the housing (15).

10. An active filter according to claim 9, characterized in that: The capacitor plate (19) is electrically connected to the power plate (12), the control plate (14), the inductor plate (13) and the heat sink (11) via a copper busbar.

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