CN212934324U

CN212934324U - Inductance assembly of sine wave vehicle-mounted inverter

Info

Publication number: CN212934324U
Application number: CN202020921892.XU
Authority: CN
Inventors: 谢勇
Original assignee: Domeda Shenzhen Electrical Appliances Co ltd; Dometic Sweden AB
Current assignee: Domeda Shenzhen Electrical Appliances Co ltd; Dometic Shenzhen Electronics Co Ltd; Dometic Sweden AB
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-04-09
Anticipated expiration: 2030-05-27

Abstract

The utility model relates to an inductance component of a sine wave vehicle-mounted inverter, which comprises an inductance body and an insulating shell for accommodating the inductance body, wherein the inductance body comprises a first coil and a second coil which are wound on the same magnetic core; the inductor body penetrates through the bottom of the insulating upper shell and is vertically placed in the insulating upper shell, and the insulating base is provided with an opening and four pins arranged at the lower part of the insulating base around the opening; each of the first end and the second end of the first coil and the first end and the second end of the second coil is respectively wound to one of the pins through the opening; the inductance assembly is mounted to the printed circuit board via pins such that one output terminal and the other output terminal of the DC/AC inverter circuit are connected to the pins wound with the first terminal of the first coil and the first terminal of the second coil and such that the filter capacitor is connected to the pins wound with the second terminal of the first coil and the second terminal of the second coil through the printed circuit board.

Description

Inductance assembly of sine wave vehicle-mounted inverter

Technical Field

The utility model relates to a sine wave vehicle mounted inverter technical field, more specifically say, relate to a sine wave vehicle mounted inverter's inductance subassembly.

Background

The vehicle-mounted inverter converts 12V or 24V direct current in a vehicle into 220V/50Hz or 110V/60H alternating current through inversion, so that a user can use electrical equipment needing alternating current power supply in the vehicle conveniently. One type of vehicle-mounted inverter is a sine wave vehicle-mounted inverter that outputs a sine wave-shaped alternating current.

As shown in the schematic circuit diagram of fig. 1, the sine wave vehicle-mounted inverter includes a DC/AC inverter circuit 30 and an output filter circuit 40, wherein the output filter circuit includes a first stage filter circuit 401 and a second stage filter circuit 402. The first stage filter circuit 401 includes an inductor L1 and a filter capacitor C1 for filtering the sine wave pulse width modulated square wave voltage output by the DC/AC inverter circuit 30 into a sine wave AC voltage. The inductor L1 is a differential mode inductor with two coils, and comprises a first coil L1-1 and a second coil L1-2. The first end L1-1-1 of the first coil L1-1 and the first end L1-2-1 of the second coil are electrically connected with one output end A and the other output end B of the DC/AC inverter circuit respectively, and the filter capacitor C1 is electrically connected between the second end L1-1-2 of the first coil L1-1 and the second end L1-2-2 of the second coil L1-2. Therefore, such a filter circuit 401 having two coils realizes two-way symmetric filtering, so that a large leakage current does not occur as compared with a filter circuit having only one coil.

It is desirable for the vehicle-mounted inverter that the circuit devices therein can be compactly arranged in the direction along the printed circuit board. To this end, an inductor assembly is proposed, as shown in fig. 2, in which an inductor body is inserted into a housing in such a way that its separating plates for separating two coils are substantially perpendicular to the top and bottom of the housing, and is mounted to a printed circuit board via pins arranged at the sides of the housing. The structure of the inductance assembly enables the size of the inductance element in the direction along the printed circuit board to be reduced to some extent, thereby achieving a certain degree of compact arrangement of the circuit devices in the direction along the printed circuit board. However, in this inductance assembly, since the portions of the leads and the fixing leads are disposed at the side of the case, a certain space is occupied in the direction along the printed circuit board, which limits further reduction in the size of the inductance assembly, thereby affecting the compactness of the vehicle-mounted inverter.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in how to further reduce the size of inductance component in order to obtain compacter on-vehicle dc-to-ac converter. Therefore, the utility model provides a novel inductance subassembly of on-vehicle dc-to-ac converter of sine wave.

The utility model provides a technical scheme that its technical problem adopted is: the inductance assembly and the filter capacitor form a power filter circuit for converting sine wave pulse width modulated square wave voltage output by a DC/AC inverter circuit in the sine wave vehicle-mounted inverter into sine wave alternating current voltage, wherein the inductance assembly comprises an inductance body and an insulating shell for accommodating the inductance body, and the inductance body comprises a first coil and a second coil which are wound on the same magnetic core; the insulating shell comprises an insulating upper shell and an insulating base, wherein the inductor body is placed in the insulating upper shell in a mode that a plane where the diameter of the magnetic core is located penetrates through the top of the insulating upper shell; wherein each of the first and second ends of the first coil and the first and second ends of the second coil is wound to one of the pins through the opening, respectively; the inductance component is mounted to a printed circuit board via the pins such that one output terminal and the other output terminal of the DC/AC inverter circuit are connected to the pins around which the first terminal of the first coil and the first terminal of the second coil are wound and the filter capacitor is connected to the pins around which the second terminal of the first coil and the second terminal of the second coil are wound through the printed circuit board.

According to the utility model discloses an inductance subassembly is drawn forth the tip of coil and is connected to the pin through the opening with the pin setting in the insulator foot's of casing lower part and through insulator foot, has avoided the influence of pin to the size of casing lateral part for its size in the side along printed circuit board can obtain further reduction, and then improves the compactedness of on-vehicle dc-to-ac converter.

In addition, according to the utility model discloses an inductance component of on-vehicle inverter of sine wave can also have following additional technical characterstic:

according to an aspect of the present invention, the boundary of the opening has a circular arc-shaped portion extending toward the pin at a position corresponding to the pin.

According to an aspect of the present invention, the insulating base lower part is provided with a protrusion, wherein the protrusion is located on a side of the pin away from the opening, and is lower than the pin.

According to an aspect of the present invention, the insulating base has a protrusion extending downward, wherein the opening is provided in the protrusion, and the pin is provided at a lower portion of the protrusion.

According to an aspect of the present invention, the protrusion is provided at a lower portion of the protrusion.

According to an aspect of the utility model, the inductance subassembly further includes and is used for fixing in the insulating epitheca the embedment material filling layer of inductance body, wherein this embedment material filling layer passes through the opening of insulator foot pours into.

According to an aspect of the present invention, the side wall of the insulating upper case has two opposite extension portions at a lower portion thereof, and openings are respectively provided on walls of the two extension portions, and the insulating base is provided at an upper portion thereof with a snap protrusion which is engaged with the openings.

According to an aspect of the present invention, the lower portion of the sidewall portion of the insulative upper case, which does not have the extension, has two opposite protrusions, and the insulative base is provided at an upper portion thereof with a recess to be fitted with the protrusions.

According to an aspect of the present invention, the contour of the lower portion of the insulating upper shell has a shape adapted to the contour of the insulating base, and the contour of the upper portion of the insulating upper shell has a shape adapted to the arc shape of the magnetic core.

According to an aspect of the present invention, the contour of the insulating base and the contour of the lower portion of the insulating upper shell are preferably both rectangular in shape, and the contour of the upper portion of the insulating upper shell is preferably half hexagonal in shape.

According to an aspect of the present invention, the insulating upper shell and the insulating base are preferably a plastic upper shell and a plastic base.

According to an aspect of the invention, the potting material is preferably epoxy.

Drawings

The invention will be further explained with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic circuit diagram of a DC/AC inverter circuit and an output filter circuit in a sine wave vehicle inverter;

FIG. 2 is a schematic diagram of the structure of the inductance assembly of a known sine wave vehicle inverter;

fig. 3 is a schematic cross-sectional view of an inductance assembly of a sine wave on-board inverter according to the present invention;

fig. 4A and 4B are schematic structural diagrams of an insulating upper shell and an insulating base of an inductance assembly of the sine wave vehicle-mounted inverter according to the present invention, respectively;

fig. 5 is a schematic structural diagram of an inductance assembly of the sine wave vehicle-mounted inverter according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The inductance assembly of the sine wave vehicle-mounted inverter according to the present invention is described below with reference to the accompanying drawings.

Fig. 3 and 5 show schematic structural diagrams of an inductance assembly 10 according to the present invention. The inductor assembly 10 includes an inductor body L1 and a housing 11. Specifically, the inductor body L1 includes a coil 3 wound on the magnetic core 1, which includes a first coil and a second coil; in addition, the inductor body further comprises an isolation plate 4 (for example, an epoxy plate or a PCB substrate) for separating the first coil and the second coil to ensure insulation. The housing 11 includes an insulating upper case 5 and an insulating base 2. The magnetic core 1 wound with the coil 3 is placed in the insulating upper shell 5 with its plane of diameter passing through the top of the shell (e.g., optionally inserted into the shell with the separator plates substantially perpendicular to the top and bottom of the shell). The insulating base 2 is provided with an opening 7 and four pins 8 arranged in the lower part of the insulating base around the opening 7. Assembling the insulating upper shell 5 and the insulating base 2, enabling the first end and the second end of the first coil and the first end and the second end of the second coil to penetrate through the opening 7 of the insulating base 2 and extend out of the shell, winding the first end of the first coil on one of the pins 8, then carrying out tin immersion operation, winding the second end of the first coil on one of the pins 8, then carrying out tin immersion operation, winding the first end of the second coil on one of the pins 8, then carrying out tin immersion operation, winding the second end of the second coil on one of the pins 8, and then carrying out tin immersion operation to form the inductance assembly 10. The inductance assembly 10 is mounted to a printed circuit board via four pins 8 by soldering so that one output terminal a of an H-bridge DC/AC inverter circuit 30 composed of four MOSFETs M1, M2, M3 and M4 is connected to the pin 8 wound with the first end of the first coil and the other output terminal B is connected to the pin 8 wound with the first end of the second coil through the printed circuit board; and such that the filter capacitor C1 is connected between the two pins 8 around which the second ends of the first and second coils are wound.

The utility model discloses in, inductance assembly 10 realizes being connected with DC/AC inverter circuit 30's output A and B's electricity and be connected with filter capacitor C1's electricity through setting up at the pin 8 of 2 lower parts of insulator foot for inductance body L1 can insert the circuit and carry out the filtering operation. The inductance assembly 10 avoids the influence of the pins on the size of the side of the housing due to the pins 8 arranged at the lower part of the insulating base 2 of the housing 11, so that the size of the side of the housing in the direction along the printed circuit board can be further reduced. In addition, since the case is made of an insulating material, the four MOSFETs M1, M2, M3 and M4 and the filter capacitor C1 constituting the H-bridge DC/AC inverter circuit 30 can be further disposed close to the inductance assembly 10 without being limited by a creepage distance.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the invention, the boundary of the opening 7 has a circular arc-shaped portion 71 extending towards the pin 8 at a position corresponding to the pin 8. For example, as shown in fig. 4B and 5, the opening 7 is substantially quadrangular in shape with four corners substantially in the shape of an outwardly diverging arc, and the four pins 8 are correspondingly arranged beside the four corners, respectively. The coil end passing through the opening 7 is wound on the pin against the rounded corner, and the rounded portion 71 serves to protect the portion of the coil end abutting the boundary of the opening from being scratched.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the present invention, the lower portion of the insulating base is provided with a protrusion 21, wherein the protrusion 21 is located on a side of the pin 8 away from the opening 7 and is lower than the pin 8. That is, the protrusion 21 is arranged on one side of the pin 8 such that the pin 8 is located between the opening 7 and the protrusion 21, and the protrusion 21 is lower than the pin 8 in the height direction. For example, as shown in fig. 5, four pins 8 are arranged at positions corresponding to four corners of the opening 7, respectively, and two protrusions 21 are arranged beside two pins located on the same side of the opening 7, respectively. The inductance assembly can be better supported on the printed circuit board by the contact of the protrusion 21 with the printed circuit board and thus the soldering of the pins is facilitated.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the present invention, the insulating base 2 has a downwardly extending protrusion 22, i.e. a thickened portion, wherein the opening 7 is provided in the protrusion 22 and the pin 8 and/or the protrusion 21 are provided at a lower portion of the protrusion 22, as shown in fig. 4B and 5. The purpose of the provision of the projections 22 is to satisfy the thickness required for the introduction of the pins 8 of the insulating base 2 without increasing the thickness of the insulating base 2 as a whole, so that the amount of material used for manufacturing the insulating base 2 can be saved.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the invention, the opening 7 may be designed such that the housing 11 can be filled with potting material, for example epoxy resin, through it. The potting material filling layer 6 (clearly shown in fig. 3) may serve as a fixing for the inductor body. In addition, the potting material filling layer 6 can also conduct heat to reduce the temperature rise of the inductor body.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the present invention, the opening 51 provided on the sidewall of the upper insulating shell 5 may cooperate with the snap protrusions 23 on the insulating base 2 to achieve easy assembly of the housing 11. Specifically, as shown in fig. 4A and 4B, two opposite side walls of the upper insulating shell 5 respectively have an extension portion 52 extending downward, an opening 51 is formed on the extension portion 52, and the insulating base 2 is provided with a snap protrusion 23 at an upper portion thereof, the snap protrusion 23 being engaged with the opening 51, and the assembly of the housing 11 can be achieved by snapping the snap protrusion 23 into the opening 51. In an alternative example, the other two opposite side walls (i.e., the two opposite side walls not provided with the opening) may be provided at the bottom thereof with protrusions 53, respectively, and the insulation base 2 is provided at the upper portion thereof with a recess 24 as a fitting catching place into which the protrusions 53 can be inserted. The structure that the protrusion is matched with the recess can strengthen the fixation between the insulating upper shell and the insulating base. However, it should be understood that the assembly of the housing 11 may also be achieved in other ways. For example, the side wall on the insulating upper shell can be alternatively provided with a snap projection, and the insulating base is correspondingly provided with an opening; or alternatively by means of bonding, gluing, etc., for example.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the present invention, in order to make the insulating upper shell 5 better match the magnetic core 1 and the insulating base 2 for facilitating the assembly of the inductance assembly, the shape of the contour of the upper portion of the insulating upper shell 5 may be designed as a half hexagon, the shape being such that three walls are formed at the upper portion of the insulating upper shell 5 for well supporting the arc-shaped contour of the magnetic core 1, while the contour of the lower portion of the insulating upper shell 5 may be designed to have substantially the same or similar shape as the contour of the insulating base 2, for example, optionally both rectangular. However, it should be understood that the shapes in the above embodiments should not play a limiting role in the present invention, and the insulating upper shell and the insulating base in the inductance assembly according to the present invention may also adopt other contour shapes.

Additionally or alternatively, in an alternative embodiment of the inductance assembly according to the present invention, the insulating upper shell 5 and the insulating base 2 are preferably plastic upper shells and bases.

According to the above disclosure of the present invention, "the insulating case accommodates the inductor body" or "the inductor body is placed/accommodated in the insulating upper case" in this specification may be understood as that the portion of the inductor body other than the end portion of the coil drawn out to be wound on the pin is accommodated/placed in the insulating case.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation configuration and operation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features.

While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that combinations, variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. An inductance assembly of a sine wave vehicle-mounted inverter forms a power filter circuit for converting a sine wave pulse width modulated square wave voltage output by a DC/AC inverter circuit in the sine wave vehicle-mounted inverter into a sine wave alternating voltage with a filter capacitor, wherein the inductance assembly comprises an inductance body and an insulating shell for accommodating the inductance body, and the inductance body comprises a first coil and a second coil which are wound on the same magnetic core; the insulation shell comprises an insulation upper shell and an insulation base, wherein the inductor body penetrates through the bottom of the insulation upper shell and is vertically placed in the insulation upper shell; wherein each of the first and second ends of the first coil and the first and second ends of the second coil is wound to one of the pins through the opening, respectively; the inductance component is mounted to a printed circuit board via the pins such that one output terminal and the other output terminal of the DC/AC inverter circuit are connected to the pins around which the first terminal of the first coil and the first terminal of the second coil are wound and the filter capacitor is connected to the pins around which the second terminal of the first coil and the second terminal of the second coil are wound through the printed circuit board.

2. The inductance assembly of the sine wave on-board inverter according to claim 1, wherein the four pins are located inside a lower portion of the insulation base, and an outline of the insulation base and an outline of a lower portion of the insulation upper case of the inductance assembly are both rectangular in shape.

3. The inductance assembly of a sine wave vehicle inverter according to claim 1, wherein said insulation base lower part is provided with a protrusion part, wherein said protrusion part is located on one side of said pin far from said opening and lower than said pin.

4. The inductance assembly of a sine wave vehicle inverter according to claim 3, wherein said insulating base has a downwardly extending protrusion, wherein said opening is provided in said protrusion and said pin is provided at a lower portion of said protrusion.

5. The inductance assembly of a sine wave on-board inverter according to claim 4, wherein said protrusion is provided at a lower portion of said protrusion.

6. The sine wave vehicle inverter inductance assembly according to claim 1, further comprising a potting material fill layer for securing the inductor body in the insulative upper shell.

7. The inductance assembly of a sine wave vehicle inverter according to claim 1, wherein said side wall of said insulating upper case has two opposite extensions at its lower portion, openings are respectively provided at the walls of the two extensions, and said insulating base is provided with a snap protrusion at its upper portion to be fitted with said openings.

8. The inductance assembly of a sine wave vehicle inverter according to claim 7, wherein said insulating base has a recess at its upper portion to match said protrusion, and two opposite protrusions are formed at the lower portion of the sidewall portion of said insulating upper case having no extension.

9. The inductance assembly of the sine wave on-board inverter according to claim 1, wherein the contour of the lower portion of the insulating upper case has a shape adapted to the contour of the insulating base, and the contour of the upper portion of the insulating upper case has a shape adapted to the arc shape of the magnetic core.

10. The inductance assembly of a sine wave vehicle inverter according to claim 9, wherein the contour of said insulating base and the contour of the lower portion of said insulating upper shell are both rectangular in shape, and the contour of the upper portion of said insulating upper shell is half hexagonal in shape.