An electrical connection terminal structure, an electrode plate, and a DC-AC inverter

Abstract

The utility model discloses a kind of electric connection terminal structure, electrode plate and DC-AC inverter device, including first connection end and second connection end, first connection end has a first electric connection terminal, second connection end has two second electric connection terminals, first electric connection terminal and two second electric connection terminals are arranged side by side, and first electric connection terminal is located between two second electric connection terminals to form three-terminal electric connection structure.The three-terminal electric connection structure of the utility model makes the connection circuit formed by inverter device and power module exhibit parallel resonance behavior under certain frequency, to reduce electromagnetic interference, impedance is mutually offset, entire circuit presents extremely high impedance to external signal, also can reduce the internal resistance of inverter device, improve heat resistance heat conduction efficiency, overall power density improves 30%, can use smaller capacitance to stabilize larger power motor.

Description

Technical Field

[0001] This utility model relates to the technical field of DC-AC inverter devices, specifically to an electrical connection terminal structure, an electrode plate, and a DC-AC inverter device. Background Technology

[0002] As attached Figure 9 As shown, a prior art electrode plate structure includes a positive electrode plate and a negative electrode plate installed inside an inverter. The positive electrode plate has several positive connection terminals 1', and the negative electrode plate has several negative connection terminals 2'. Each positive connection terminal and each negative connection terminal are combined to form several pairs of positive-negative two-terminal electrical connection structures. Each pair of positive-negative two-terminal electrical connection structures consists of one positive connection terminal and one negative connection terminal. The positive-negative two-terminal electrical connection structures enable the electrode plate to be electrically connected to an external power module. However, the existing positive-negative two-terminal electrical connection structures have electromagnetic interference problems and high loop impedance when electrically connected to an external power module. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an electrical connection terminal structure, which mainly solves the technical problems of electromagnetic interference and high loop impedance when connecting power modules using existing two-terminal electrical connection structures.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] An electrical connection terminal structure includes a first connection end and a second connection end. The first connection end has a first electrical connection terminal, and the second connection end has two second electrical connection terminals. The first electrical connection terminal and the two second electrical connection terminals are arranged side by side, and the first electrical connection terminal is disposed between the two second electrical connection terminals to form a three-terminal electrical connection structure.

[0006] Furthermore, the first electrical connection terminal and the two second electrical connection terminals are configured to be spaced apart from each other in the same plane, and the distance between the two second electrical connection terminals and the first electrical connection terminal is equal.

[0007] Furthermore, the two second electrical connection terminals cooperate with the first electrical connection terminal to form two independent current channels, and the magnetic fields generated by the two current channels are equal in magnitude and opposite in direction, so that the magnetic fields can cancel each other when current flows through the two current channels.

[0008] Furthermore, the first connection terminal is the negative connection terminal, and the second connection terminal is the positive connection terminal. The first electrical connection terminal and the two second electrical connection terminals are combined to form a positive-negative-positive three-terminal electrical connection structure.

[0009] Furthermore, the first connection terminal is a positive connection terminal, and the second connection terminal is a negative connection terminal. The first electrical connection terminal and the two second electrical connection terminals are combined to form a negative-positive-negative three-terminal electrical connection structure.

[0010] Furthermore, in the three-terminal electrical connection structure, the width of a single second electrical connection terminal is smaller than the width of the first electrical connection terminal, while the width of the two second electrical connection terminals is larger than the width of the first electrical connection terminal.

[0011] Based on the same inventive concept, this utility model also provides an electrode plate, including a first electrode plate, a second electrode plate and the above-mentioned electrical connection terminal structure, wherein the first connection end is disposed on the first electrode plate and the second connection end is disposed on the second electrode plate.

[0012] Furthermore, a first connection end is provided on both sides of the first electrode plate, and a second connection end is provided on both sides of the second electrode plate, so that a three-terminal electrical connection structure is formed on both sides of the electrode plate formed by the combination of the first electrode plate and the second electrode plate.

[0013] Furthermore, the first and second electrode plates are bent and tightly fitted on both sides, and an insulating layer is provided between the first and second electrode plates at the tightly fitted position.

[0014] Furthermore, three sets of three-terminal electrical connection structures are formed on both sides of the electrode plate.

[0015] Furthermore, in the three sets of three-terminal electrical connection structures on one side of the electrode plate, the two second electrical connection terminals of the middle three-terminal electrical connection structure are connected to the corresponding two second electrical connection terminals in the adjacent three-terminal electrical connection structures to form an integral unit.

[0016] Based on the same inventive concept, this utility model also provides a DC-AC inverter device, including a housing, a core, and the aforementioned electrode plates. The core is installed inside the housing. The first electrode plate and the second electrode plate of the electrode plate are respectively connected to the positive and negative electrodes of the core. The first connection end on the first electrode plate and each second connection end on the second electrode plate protrude from the top two sides of the housing. Several power modules are installed on the top of the housing, each corresponding to a set of three-terminal electrical connection structures. Each power module is electrically connected to the corresponding three-terminal electrical connection structure.

[0017] Furthermore, each connection terminal of the power module is connected to the first electrical connection terminal and the two second electrical connection terminals in the three-terminal electrical connection structure via a bent copper sheet.

[0018] The above technical solution has the following advantages or beneficial effects:

[0019] In the electrical connection terminal structure, electrode plate, and DC-AC inverter of this utility model, the three-terminal electrical connection structure enables the connection circuit formed by the inverter and the power module to exhibit parallel resonance behavior at a certain frequency, thereby reducing electromagnetic interference, canceling out impedances, and making the entire circuit present extremely high impedance to external signals. It can also reduce the internal resistance of the inverter, improve thermal resistance and heat conduction efficiency, increase the overall power density by 30%, and use smaller capacitance values ​​to stably drive larger power motors. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the electrode plate according to Embodiment 1 of this utility model.

[0021] Figure 2 This is a schematic diagram of the assembly structure of the electrode plate according to Embodiment 1 of this utility model.

[0022] Figure 3 This is another angle assembly structure of the electrode plate in Embodiment 1 of this utility model.

[0023] Figure 4 This is a side view of the assembly structure of the electrode plate according to Embodiment 1 of this utility model.

[0024] Figure 5 yes Figure 4 A magnified view of section A in the image.

[0025] Figure 6 This is a front view of the assembly structure of the electrode plate according to Embodiment 1 of this utility model.

[0026] Figure 7 This is a three-dimensional structural schematic diagram of the DC-AC inverter device according to Embodiment 1 of this utility model.

[0027] Figure 8 This is a front view of the assembly structure of the electrode plate according to Embodiment 2 of this utility model.

[0028] Figure 9 This is a schematic diagram of the structure of an electrode plate in the prior art.

[0029] Labeling Explanation: 1. First electrical connection terminal, 2. Second electrical connection terminal, 3. First electrode plate, 4. Second electrode plate, 5. Insulating layer, 6. Housing, 7. Core, 8. Power module, 9. Bent copper sheet, 31. First input terminal, 41. Second input terminal. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Example 1

[0033] Please refer to the appendix. Figure 1 To be continued Figure 7 One embodiment of this utility model provides an electrical connection terminal structure for the electrical connection between an inverter and a power module. It includes a first connection terminal and a second connection terminal. The first connection terminal has one first electrical connection terminal 1, and the second connection terminal has two second electrical connection terminals 2. The first electrical connection terminal 1 and the two second electrical connection terminals 2 are arranged side-by-side, with the first electrical connection terminal 1 positioned between the two second electrical connection terminals 2, thus forming a three-terminal electrical connection structure. It is understood that in this embodiment, the three-terminal electrical connection structure causes the connection circuit formed by the inverter and the power module to exhibit parallel resonance behavior at a certain frequency, thereby reducing electromagnetic interference, canceling out impedances, and resulting in a very high impedance to external signals. It also reduces the internal resistance of the inverter, improves thermal conductivity, increases the overall power density by 30%, and allows for the stable driving of a higher-power motor with a smaller capacitance value.

[0034] In addition, compared to the attached Figure 9 The existing two-terminal electrical connection structure shown in this embodiment is improved from the existing two-terminal electrical connection structure to a three-terminal electrical connection structure. In this way, the original single current channel structure is transformed into a dual current channel structure, which has stronger current capacity, current shunting, more uniform heat distribution, and current is dispersed to more connection nodes. This helps to reduce the current density and heat generation of a single terminal, thereby better coping with high current (above 300A) application scenarios.

[0035] Please refer to the appendix. Figure 1 To be continued Figure 7In one preferred embodiment, the first connection terminal is the negative connection terminal, and the second connection terminal is the positive connection terminal. The first electrical connection terminal 1 and the two second electrical connection terminals 2 combine to form a positive-negative-positive three-terminal electrical connection structure. The first electrical connection terminal 1 and the two second electrical connection terminals 2 are configured to be spaced apart from each other in the same plane, and the distance between the two second electrical connection terminals 2 and the first electrical connection terminal 1 is equal. The two second electrical connection terminals 2 cooperate with the first electrical connection terminal 1 to form two independent current channels, and the magnetic fields generated by the two current channels are equal in magnitude and opposite in direction, so that the magnetic fields can cancel each other when current flows through the two current channels. In this embodiment, the positive-negative-positive three-terminal arrangement makes the positive and return currents tightly coupled, which helps to reduce the current loop area. This reduces electromagnetic radiation, reduces interference to external circuits, and improves the electromagnetic compatibility (EMC) performance of the system. Moreover, the positive-negative-positive three-terminal electrical connection structure has lower parasitic inductance than the existing two-terminal electrical connection structure, reduces loop coupling and radiation, and has better EMI performance. The structure density is more compact, which is beneficial for high power density design.

[0036] However, those skilled in the art should understand that in other embodiments, the first connection terminal may also be a positive connection terminal, and the second connection terminal may be a negative connection terminal. The first electrical connection terminal 1 and the two second electrical connection terminals 2 are combined to form a negative-positive-negative three-terminal electrical connection structure. This is not limited to the specific implementation method disclosed in this embodiment. The negative-positive-negative three-terminal electrical connection structure formed after the positive and negative terminals are reversed has basically no significant difference in effect from the positive-negative-positive three-terminal electrical connection structure.

[0037] Please refer to the appendix. Figure 6 In this embodiment, the current enters from the positive terminal and exits from the negative terminal in the three-terminal electrical connection structure, forming a dual current channel. Its circuit impedance is small, the current density is relatively low, and the composite or overlapping area (the overlapping area of ​​the busbar part under the connection terminal) is increased, which is conducive to generating a magnetic field to cancel out and reduce the interference effect.

[0038] Please refer to the appendix. Figure 6 In one preferred embodiment, the width of a single second electrical connection terminal 2 in the three-terminal electrical connection structure is smaller than the width of the first electrical connection terminal 1, while the width of the two second electrical connection terminals 2 is larger than the width of the first electrical connection terminal 1. This design, based on the inverter's dynamic losses, conduction resistance, blocking voltage, and current density, enables the inverter to drive a high-power motor with a small capacitance value, while improving heat conduction efficiency and keeping the inverter operating at a lower operating temperature, thereby extending its service life.

[0039] Please refer to the appendix. Figure 1 To be continued Figure 7One embodiment of this utility model also provides an electrode plate, including a first electrode plate 3, a second electrode plate 4, and the aforementioned electrical connection terminal structure. The first electrode plate 3 and the second electrode plate 4 are bent and tightly fitted at their sides, and an insulating layer 5 is provided between the tightly fitted positions of the first electrode plate 3 and the second electrode plate 4. A first connection end is provided on the first electrode plate 3, and a second connection end is provided on the second electrode plate 4. A first input terminal 31 is connected to the first electrode plate 3, and a second input terminal 41 is connected to the second electrode plate 4. Preferably, a first connection end is provided on both sides of the first electrode plate 3, and a second connection end is provided on both sides of the second electrode plate 4, so that a three-terminal electrical connection structure is formed on both sides of the electrode plate formed by the combination of the first electrode plate 3 and the second electrode plate 4. Further, three sets of three-terminal electrical connection structures are formed on both sides of the electrode plate. However, those skilled in the art should understand that in other embodiments, other numbers of three-terminal electrical connection structures can be provided on both sides of the electrode plate according to specific needs, and the embodiment is not limited to the specific implementation disclosed herein.

[0040] Please refer to the appendix. Figure 1 To be continued Figure 7 One embodiment of this utility model also provides a DC-AC inverter device, including a housing 6, a core 7, and the aforementioned electrode plates. The core 7 is installed inside the housing 6. The first electrode plate 3 and the second electrode plate 4 of the electrode plates are respectively connected to the positive and negative terminals of the core 7. The first connection end on the first electrode plate 3 and each of the second connection ends on the second electrode plate 4 protrude from the top sides of the housing 6. A plurality of power modules 8 are installed on the top of the housing 6, each corresponding to a set of three-terminal electrical connection structures. Each power module 8 is electrically connected to its corresponding three-terminal electrical connection structure. In a preferred embodiment, preferably, each connection end of the power module 8 is connected to the first electrical connection terminal 1 and the two second electrical connection terminals 2 in the three-terminal electrical connection structure via a bent copper sheet 9. This design eliminates the need for bending operations when connecting the first electrical connection terminal 1 and the second electrical connection terminal 2 in each three-terminal electrical connection structure to the corresponding terminals of the power module 8, reducing assembly difficulty and improving assembly efficiency. However, those skilled in the art should understand that in other embodiments, they may also directly bend the first electrical connection terminal 1 and the second electrical connection terminal 2 in the three-terminal electrical connection structure by 90° and then connect them to the corresponding power module 8 based on other needs (such as material costs).

[0041] Example 2

[0042] Please refer to the appendix. Figure 8The difference between this embodiment and Embodiment 1 lies only in that, in the three sets of three-terminal electrical connection structures on one side of the electrode plate, the two second electrical connection terminals 2 of the middle three-terminal electrical connection structure are connected to the corresponding two second electrical connection terminals 2 in the adjacent three-terminal electrical connection structures to form a single unit. In this embodiment, the adjacent two second electrical connection terminals 2 are merged and connected to form a single unit, which helps to improve its current carrying capacity and heat dissipation capacity, reduce the current coupling effect and transient current imbalance caused by asymmetrical layout, and help to achieve current sharing and reduce thermal stress.

[0043] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. An electrical connection terminal structure, characterized in that: It includes a first connection end and a second connection end. The first connection end has a first electrical connection terminal (1), and the second connection end has two second electrical connection terminals (2). The first electrical connection terminal (1) and the two second electrical connection terminals (2) are arranged side by side, and the first electrical connection terminal (1) is located between the two second electrical connection terminals (2) to form a three-terminal electrical connection structure.

2. The electrical connection terminal structure according to claim 1, characterized in that: The first electrical connection terminal (1) and the two second electrical connection terminals (2) are configured to be spaced apart from each other in the same plane, and the distance between the two second electrical connection terminals (2) and the first electrical connection terminal (1) is equal.

3. The electrical connection terminal structure according to claim 1, characterized in that: The two second electrical connection terminals (2) cooperate with the first electrical connection terminal (1) to form two independent current channels, and the magnetic fields generated by the two current channels are equal in magnitude and opposite in direction, so that the magnetic fields can cancel each other when current flows through the two current channels.

4. The electrical connection terminal structure according to claim 1, characterized in that: The first connection terminal is the negative connection terminal, and the second connection terminal is the positive connection terminal. The first electrical connection terminal (1) and the two second electrical connection terminals (2) are combined to form a positive-negative-positive three-terminal electrical connection structure.

5. The electrical connection terminal structure according to claim 1, characterized in that: The first connection terminal is the positive connection terminal, and the second connection terminal is the negative connection terminal. The first electrical connection terminal (1) and the two second electrical connection terminals (2) are combined to form a negative-positive-negative three-terminal electrical connection structure.

6. The electrical connection terminal structure according to any one of claims 1 to 5, characterized in that: In the three-terminal electrical connection structure, the width of a single second electrical connection terminal (2) is smaller than the width of the first electrical connection terminal (1), while the width of the two second electrical connection terminals (2) is greater than the width of the first electrical connection terminal (1).

7. An electrode plate, characterized in that: It includes a first electrode plate (3), a second electrode plate (4), and an electrical connection terminal structure as described in any one of claims 1 to 6, wherein a first connection end is disposed on the first electrode plate (3), and a second connection end is disposed on the second electrode plate (4).

8. The electrode plate according to claim 7, characterized in that: A first connection end is provided on both sides of the first electrode plate (3), and a second connection end is provided on both sides of the second electrode plate (4), so that a three-terminal electrical connection structure is formed on both sides of the electrode plate formed by the combination of the first electrode plate (3) and the second electrode plate (4).

9. The electrode plate according to claim 8, characterized in that: The first electrode plate (3) and the second electrode plate (4) are bent and tightly attached to each other on both sides, and an insulating layer (5) is provided between the first electrode plate (3) and the second electrode plate (4) at the tightly attached position.

10. The electrode plate according to claim 8, characterized in that: Three sets of three-terminal electrical connection structures are formed on both sides of the electrode plate.

11. The electrode plate according to claim 10, characterized in that: In the three sets of three-terminal electrical connection structures on one side of the electrode plate, the two second electrical connection terminals (2) of the middle three-terminal electrical connection structure are connected to the corresponding two second electrical connection terminals (2) in the adjacent three-terminal electrical connection structure to form an integral unit.

12. A DC-AC inverter, characterized in that: The device includes a housing (6), a core (7), and an electrode plate as described in any one of claims 7 to 11. The core (7) is installed inside the housing (6). The first electrode plate (3) and the second electrode plate (4) of the electrode plate are respectively connected to the positive and negative electrodes of the core (7). The first connection end on the first electrode plate (3) and the second connection end on the second electrode plate (4) are respectively protruding from the top two sides of the housing (6). A plurality of power modules (8) are installed on the top of the housing (6) and are respectively arranged to correspond to each group of three-terminal electrical connection structures. Each power module (8) is electrically connected to the corresponding three-terminal electrical connection structure.

13. The DC-AC inverter device according to claim 12, characterized in that: Each connection terminal of the power module (8) is connected to the first electrical connection terminal (1) and the two second electrical connection terminals (2) in the three-terminal electrical connection structure through a bent copper sheet (9).

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