Input voltage sensing apparatus of inverter

Abstract

An input voltage sensing device for an inverter is introduced, comprising: a busbar assembly including a first terminal portion electrically connected to a battery and a second terminal portion branched from the first terminal portion; and a substrate equipped with a contactor into which the second terminal portion is inserted and a voltage sensor that receives and senses the voltage of the battery from the busbar assembly through the contactor.

Description

Technology Field

[0001] The present disclosure relates to an input voltage sensing device for an inverter that senses a voltage input to the inverter. Background Technology

[0003] Power converters have the function of converting alternating current (AC) and direct current (DC) power to one another and are widely used in various electronic devices and industrial equipment. In particular, inverters are devices that convert DC power into AC power and are used in solar power generation systems, electric vehicles, home appliances, and industrial motor control systems.

[0004] One of the important elements in the operation of an inverter is voltage sensing technology, which can be utilized to control the inverter by measuring its input or output voltage and transmitting it to a control system.

[0005] Accurate voltage sensing plays a role in increasing the efficiency of power conversion, preventing damage caused by overvoltage or undervoltage, and ensuring a stable power supply.

[0006] For voltage sensing of such an inverter, a connection structure between the inverter's input terminal and the voltage sensor is required.

[0009] The matters described as background technology above are intended only to enhance understanding of the background of the present disclosure and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. The problem to be solved

[0011] The embodiments of the present disclosure are intended to provide an input voltage sensing device for an inverter having a structure that can improve efficiency in cost, space, and manufacturing process by directly connecting a bus bar to which the input voltage of the inverter is applied to a substrate equipped with a voltage sensor.

[0013] The problems to be solved by the present disclosure are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0015] An input voltage sensing device for an inverter according to one embodiment for realizing the above-mentioned problem comprises: a busbar assembly including a first terminal portion electrically connected to a battery and a second terminal portion branched from the first terminal portion; and a substrate equipped with a contactor into which the second terminal portion is inserted and a voltage sensor that receives and senses the voltage of the battery from the busbar assembly through the contactor. Effects of the invention

[0017] According to the various embodiments described above, accessories such as fastening bolts, wires, and connectors can be omitted, and a busbar and a voltage sensor can be connected through a simplified component and connection structure.

[0018] As the input voltage sensing structure is simplified, manufacturing costs can be reduced, and the space required for voltage sensing within the inverter can be reduced.

[0019] In addition, it becomes possible to reduce the labor required for assembling parts and lower the possibility of manufacturing defects.

[0021] The effects obtainable through the embodiments of the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below. Brief explanation of the drawing

[0023] FIG. 1 is a drawing showing a connection structure between a busbar assembly and a substrate according to one embodiment. FIG. 2 is a drawing showing a substrate according to one embodiment. FIG. 3 is a perspective view of a contactor according to one embodiment. FIG. 4 is a cross-sectional view of a contactor according to one embodiment. Specific details for implementing the invention

[0024] Specific structural or functional descriptions of the embodiments of the present disclosure are illustrative of the embodiments merely for the purpose of explaining the embodiments, and the embodiments may be implemented in various forms and should not be interpreted as being limited to the disclosed forms.

[0025] The embodiments disclosed herein may be modified in various ways and may take various forms, and specific embodiments among them are illustrated in the drawings and described in detail. However, this is not intended to limit the embodiments to specific disclosed forms, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and scope of the technology intended to be provided by the present disclosure.

[0026] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined herein.

[0027] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are given the same reference number, and redundant descriptions thereof will be omitted.

[0028] The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0029] In describing the embodiments, if it is determined that a detailed description of related prior art may obscure the essence of the embodiments, such detailed description is omitted. Furthermore, the attached drawings are intended only to facilitate understanding of the embodiments, and the technical concept intended to be provided by the present disclosure is not limited by the attached drawings; it should be understood that the technical concept and scope intended to be provided by the present disclosure include all modifications, equivalents, and substitutions.

[0030] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0031] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0032] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0033] In the present disclosure, terms such as “comprising” or “having” are intended to specify the existence of features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0034] Hereinafter, embodiments of the present disclosure will be described in detail with reference to each drawing.

[0036] FIG. 1 is a drawing showing a connection structure between a busbar assembly and a substrate according to one embodiment, FIG. 2 is a drawing showing a substrate according to one embodiment, FIG. 3 is a perspective view of a contactor according to one embodiment, and FIG. 4 is a cross-sectional view of a contactor according to one embodiment.

[0038] Referring together to FIGS. 1 to 4, an input voltage sensing device of an inverter according to one embodiment includes a busbar assembly (100) and a substrate (200). The input voltage sensing device of an inverter according to one embodiment may be implemented as part of the inverter's configuration within the inverter's housing or packaging, or alternatively, may be implemented as a separate configuration connected to the inverter.

[0039] The busbar assembly (100) includes a first terminal portion (110) electrically connected to the battery and a second terminal portion (120) branched from the first terminal portion (110), and the substrate (200) may include a contactor (210) into which the second terminal portion (120) is inserted and a voltage sensor (220) that receives and senses the voltage of the battery from the busbar assembly (100) through the contactor (210).

[0040] More specifically, the first terminal section (110) includes a first-1 terminal (111) corresponding to the positive electrode and a first-2 terminal (112) corresponding to the negative electrode, and can be connected to the positive and negative electrodes of the battery through the first-1 terminal (111) and the first-2 terminal (112). In this case, the second terminal section (120) includes a second-1 terminal (121) branched from the first-1 terminal (111) and a second-2 terminal (112) branched from the first-2 terminal (112), thereby electrically connecting the voltage sensor (220) of the substrate (200) to the positive and negative electrodes of the battery.

[0041] In the above structure, the busbar assembly (100) and the substrate (200) are directly connected through the second terminal portion (120) and the contactor (210), thereby simplifying the connection structure for voltage sensing of the inverter.

[0042] According to the structure of one embodiment through the second terminal portion (120) and the contactor (210), the number of parts can be reduced compared to a connection structure using a harness including a ring terminal, fastening bolt, wire, etc., or a connector for connection thereto. Furthermore, the installation space can be reduced through the simplified structure, so when the voltage sensing device is implemented within the inverter, there is enough space to accommodate other parts within the inverter, or the size of the inverter package itself can be reduced. In addition, as parts and structures are simplified, manufacturing costs can be reduced, and the labor required for combining various parts and the possibility of manufacturing defects can be lowered.

[0043] Additionally, the second terminal portion (120) can be branched toward the contactor (210) in a direction that intersects with the direction in which the first terminal portion (110) is extended, thereby preventing interference with the first terminal portion (110) when connecting the busbar assembly (100) and the substrate (200).

[0045] Meanwhile, the busbar assembly (100) may further include a third terminal (114), an insulating part (113), and a filter part (115) in addition to the first terminal part (110) and the second terminal part (120).

[0046] The third terminal section (114) is electrically connected to the inverter, and the DC voltage of the battery applied to the busbar assembly (100) through the first terminal section (110) can be applied to the inverter via the first terminal section (110) and the third terminal section (114). To this end, the first terminal section (110) can be connected to the output terminal of the battery, and the third terminal section (114) can be connected to the input terminal of the inverter.

[0047] In this case, the second terminal portion (120) can be formed between the first terminal portion (110) and the third terminal portion (114), thereby enabling the input voltage of the inverter to be sensed.

[0048] The insulating part (113) may be composed of an insulator that surrounds a portion of the first terminal part (110), the second terminal part (120), and the third terminal part (130), thereby ensuring insulation from the outside, excluding the battery and the inverter. In this case, the first terminal part (110), the second terminal part (120), and the third terminal part (130) may be extended such that one end is exposed to the outside of the insulating part (113), and may be electrically connected to the battery, the substrate (200), and the inverter through the extended portion.

[0049] The filter section (115) may be provided between the first terminal section (110) and the second terminal section (120) on the busbar assembly (100), and may be implemented, for example, as a ferrite core. The filter section (115) can suppress electromagnetic interference signals (noise) so that the input voltage of the inverter is maintained stably.

[0050] In this case, since the second terminal section (120) and the third terminal section (114) are located at the rear end of the filter section (115) on the current path of the busbar assembly (100), the input voltage sensing of the inverter through the second terminal section (120) and the input voltage supply of the inverter through the third terminal section (114) can be performed stably.

[0052] Meanwhile, the contactor (210) may include a busbar connecting part (213) having a plurality of support parts (S) that are extended inwardly facing each other and spaced apart from each other, extending from the substrate (200) toward the second terminal part (120).

[0053] For example, the multiple support members (S) can be implemented with a thickness (t2) of 0.3 mm, and the assembly tolerance can be set to 0.4 mm. In this case, while the rigidity required to maintain contact with the second terminal member (120) is secured, low stress is applied to the multiple support members (S), thereby mitigating breakage or deformation.

[0054] In this case, the second terminal portion (120) can be inserted between a plurality of support portions (S) spaced apart from each other and connected to the contactor (210). The second terminal portion (120) is implemented with a thickness (t1) exceeding the minimum spacing (d2) between the plurality of support portions (S) to press the plurality of support portions (S) outward, and contact between the second terminal portion (120) and the contactor (210) can be made by the reaction force of the plurality of support portions (S) due to the pressure. Here, the minimum spacing refers to the spacing at the point where the plurality of support portions (S) are located closest to each other.

[0055] Additionally, the plurality of support members (S) can be folded inwardly toward each other so that the distance between them decreases as they move from the second terminal member (120) side toward the substrate (200) side (d1 to d2). With such a folding structure, the reaction force of the plurality of support members (S) is strengthened, thereby improving the contact stability between the second terminal member (120) and the contactor (210).

[0056] Furthermore, the multiple support members (S) may be folded inwardly so that the distance between them decreases as they go from the second terminal member (120) side to the substrate (200) side (d1 to d2), and then folded outwardly so that the distance between them increases as they go from the part (P) where the inwardly folded part ends (d2 to d3).

[0057] In this structure, the second terminal portion (120) can come into contact with each of the multiple support portions (S) at the end of the portion (P) that is bent inward, thereby increasing the contact area between the second terminal portion (120) and the contactor (210).

[0059] Meanwhile, each of the plurality of support members (S) may include a plurality of contact members (C) formed by branching a portion that is bent inwardly and facing each other. In this case, the plurality of contact members (C) included in each of the plurality of support members (S) may branch in a direction that intersects the direction in which the plurality of support members (S) face each other and the direction in which the plurality of support members (S) extend from the substrate (200). Through this, the number of contact points between the second terminal member (120) and the contactor (210) increases, so that even if some deformation occurs in the position or shape of the contactor (210) and the busbar assembly (100) due to assembly or use, the contact between them can be stably maintained as the number of contact points increases.

[0060] For example, in a structure equipped with a total of four contact portions (C) as shown in FIG. 3, even if some contact portions (C) become separated from the second terminal portion (120) due to twisting of the support portion (S) or the second terminal portion (120) of the contactor (210), the remaining contact portions (C) remain in contact with the second terminal portion (120), so the electrical connection is maintained and the input voltage of the inverter can be continuously detected.

[0061] To this end, a plurality of contact portions (C) included in each of the plurality of support portions (S) are protruded to the same point in the direction in which the plurality of support portions (S) face each other, so that the second terminal portion (120) can come into contact with all of the plurality of contact portions (C) in the initial state.

[0062] Meanwhile, the multiple contact portions (C) included in each of the multiple support portions (S) can be bent inwardly facing each other and protrude so that the spacing between them decreases as they go from the second terminal portion (120) side to the substrate (200) side (d1 to d2).

[0063] Additionally, the multiple contact portions (C) included in each of the multiple support portions (S) may be bent inwardly so that the spacing between them decreases as they go from the second terminal portion (120) side to the substrate (200) side (d1 to d2), and may be bent outwardly so that the spacing between them increases from the end of the inwardly bent portion (P) (d2 to d3).

[0064] Meanwhile, the contactor (210) may further include a substrate mounting portion (214) and a substrate mounting portion (215) in addition to the busbar connecting portion (213), and the substrate mounting portion (214) and the substrate mounting portion (215) may be formed integrally with the busbar connecting portion (213).

[0065] The substrate mounting portion (214) may extend in the planar direction of the substrate (200), and, for example, may have a planar shape or a shape in which a through hole is formed in the center of the planar shape. In this case, a plurality of support portions (S) may be formed by being bent and extended in a direction from the substrate mounting portion (214) toward the second terminal portion (210).

[0066] The substrate fastening portion (215) is bent and extended from the substrate mounting portion (214) toward the substrate (200), and can be fastened to the substrate (200) through the extended portion, and at least one or more may be provided.

[0067] Meanwhile, the substrate (200) is provided with a first contactor (211) into which a second-1 terminal (121) is inserted and a second contactor (212) into which a second-2 terminal (122) is inserted, so that both poles of the second terminal portion (120) can be electrically connected to the substrate (200).

[0068] In this case, the 2-1 terminal (121) and the 2-2 terminal (122) can be branched at different points on the busbar assembly (100) and arranged so as to be offset from each other, and the 1 contactor (211) and the 2 contactor (212) are arranged at positions offset from each other on the substrate (200) corresponding to the positions of the 2-1 terminal (121) and the 2-2 terminal (122) to prevent interference between the two poles and to improve the convenience of branching or arranging the 2 terminal portion (120) within the busbar assembly (100).

[0069] Meanwhile, the substrate (200) may be implemented, for example, as a printed circuit board (PCB), and may be connected to the busbar assembly (100) and grounded through the housing of the inverter, etc. Additionally, the substrate (200) may be equipped with a plurality of voltage sensors (220), and the voltage sensors (220) may be implemented, for example, as resistor elements.

[0071] According to the various embodiments described above, accessories such as fastening bolts, wires, and connectors can be omitted, and a busbar and a voltage sensor can be connected through a simplified component and connection structure.

[0072] As the input voltage sensing structure is simplified, manufacturing costs can be reduced, and the space required for voltage sensing within the inverter can be reduced.

[0073] In addition, it becomes possible to reduce the labor required for assembling parts and lower the possibility of manufacturing defects.

[0075] As stated above, although the concept or technical scope intended to be provided through this disclosure has been illustrated and described in relation to specific embodiments, it will be obvious to those skilled in the art that various improvements and changes are possible within the scope of the technical concept provided by the following claims.

Claims

Claim 1 An input voltage sensing device for an inverter, comprising: a busbar assembly including a first terminal portion electrically connected to a battery and a second terminal portion branched from the first terminal portion; and a substrate having a contactor into which the second terminal portion is inserted and a voltage sensor that receives and senses the voltage of the battery from the busbar assembly through the contactor. Claim 2 An input voltage sensing device for an inverter according to claim 1, wherein the contactor comprises a busbar fastening portion having a plurality of support portions that are extended from the substrate in a direction toward the second terminal portion and are bent inwardly opposite each other and spaced apart. Claim 3 An input voltage sensing device for an inverter according to claim 2, wherein the second terminal portion is inserted between the plurality of support portions spaced apart from each other. Claim 4 An input voltage sensing device for an inverter according to claim 3, wherein the second terminal portion has a thickness exceeding the minimum spacing between the plurality of support portions. Claim 5 An input voltage sensing device for an inverter according to claim 2, wherein the plurality of support members are bent inwardly toward each other such that the distance between them decreases as they move from the second terminal member side toward the substrate side. Claim 6 An input voltage sensing device for an inverter according to claim 2, wherein the plurality of support members are bent inwardly facing each other such that the distance between them decreases as they move from the second terminal side toward the substrate side, and are bent outwardly facing each other such that the distance between them increases from the end of the portion bent inwardly. Claim 7 An input voltage sensing device for an inverter according to claim 6, wherein the second terminal portion contacts each of the plurality of support portions at the portion where the inwardly bent portion ends. Claim 8 An input voltage sensing device for an inverter according to claim 2, wherein each of the plurality of support members comprises a plurality of contact members formed by branching inwardly bent portions facing each other. Claim 9 An input voltage sensing device for an inverter according to claim 8, wherein a plurality of contact portions included in each of the plurality of support portions are branched in a direction in which the plurality of support portions face each other and in a direction in which the plurality of support portions intersect with the direction in which the plurality of support portions extend from the substrate. Claim 10 An input voltage sensing device for an inverter according to claim 8, wherein a plurality of contact portions included in each of the plurality of support portions protrude to the same point in a direction facing each other. Claim 11 An input voltage sensing device for an inverter according to claim 10, wherein each of the plurality of support members includes a plurality of contact members, and each of the plurality of support members is bent inwardly facing each other and protrudes such that the distance between them decreases as they go from the second terminal member side to the substrate side. Claim 12 An input voltage sensing device for an inverter according to claim 10, wherein a plurality of contact portions included in each of the plurality of support portions are each of the plurality of support portions folded inwardly so as to decrease the distance between them as they move from the second terminal portion side toward the substrate side, and are folded outwardly so as to increase the distance between them from each other at the end of the portion folded inwardly, characterized in that the contact portions are protruded. Claim 13 An input voltage sensing device for an inverter according to claim 8, wherein the second terminal portion contacts each of the plurality of contact portions. Claim 14 An input voltage sensing device for an inverter according to claim 2, wherein the contactor further comprises a substrate mounting portion extending in the planar direction of the substrate, and the plurality of support portions are bent and extended in a direction toward the second terminal portion from the substrate mounting portion. Claim 15 An input voltage sensing device for an inverter according to claim 14, wherein the contactor further comprises at least one substrate fastening portion that is bent and extended from the substrate mounting portion in a direction toward the substrate and fastened to the substrate through the extended portion. Claim 16 An input voltage sensing device for an inverter according to claim 1, wherein the second terminal portion is branched toward the contactor in a direction intersecting the direction in which the first terminal portion is extended. Claim 17 An input voltage sensing device for an inverter according to claim 1, wherein the busbar assembly further comprises a third terminal portion electrically connected to the inverter, and the third terminal portion is formed on the opposite side of the first terminal portion with the second terminal portion in between. Claim 18 An input voltage sensing device for an inverter according to claim 1, wherein the first terminal portion comprises a first-1 terminal corresponding to a positive electrode and a first-2 terminal corresponding to a negative electrode, and the second terminal portion comprises a second-1 terminal branched from the first-1 terminal and a second-2 terminal branched from the first-2 terminal. Claim 19 An input voltage sensing device for an inverter according to claim 18, characterized in that the substrate is provided with a first contactor into which the second-1 terminal is inserted and a second contactor into which the second-2 terminal is inserted. Claim 20 An input voltage sensing device for an inverter according to claim 19, wherein the 2-1 terminal and the 2-2 terminal are branched at different points on the busbar assembly and arranged offset from each other, and the 1 contactor and the 2 contactor are arranged at offset positions on the substrate corresponding to the positions of the 2-1 terminal and the 2-2 terminal.

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