Converter device
By optimizing the AC row structure and position in the converter equipment, the stray inductance and voltage spike problems during IGBT shutdown are solved, and lower stray inductance and longer IGBT service life is achieved.
Patent Information
- Application Number
- CN202421148023.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-23
AI Technical Summary
During the IGBT shutdown process, existing converter equipment has a large current conversion rate di/dt, causing spikes to increase, resulting in voltage spikes, and damage to the IGBT.
By optimizing the structure and position of the AC row, the AC row is designed as a structure of upper and lower laminated rows and set it above the power module to reduce the connection path between the AC row and the DC row, capacitor group and power module terminals, and avoid ring The road is formed.
Reduces stray inductance, reduces voltage spikes in the IGBT during the shutdown process, and extends the service life of the IGBT.
Smart Images
Figure CN222484562U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power electronic equipment, and more specifically to a current conversion device. Background Art
[0002] Figure 1 The topological structure of one phase of the converter device according to an embodiment of the utility model is shown. It can be seen that one phase of the converter device is a three-level I-type topological structure, including a first bridge arm, a second bridge arm, a first clamp switch group, a second clamp switch group, and a first capacitor group C1 and a second capacitor group C2. The first bridge arm and the second bridge arm have the same structure and are respectively connected in parallel between the DC busbars, and each includes a first IGBT unit T1, a second IGBT unit T2, a third IGBT unit T3 and a fourth IGBT unit T4 connected in series in sequence. The first clamp switch group and the second clamp switch group have the same structure and each include a fifth switch tube D5 and a sixth switch tube D6 connected in series. The first capacitor group C1 is connected in parallel between the DC busbar and the midpoint of the circuit, and the second capacitor group C2 is connected in parallel between the midpoint of the circuit and the DC busbar. Figure 1 Only the circuit structure of the U / V / W phase is shown, and the other two phases have the same structure as this phase, so they will not be described again here.
[0003] This circuit has four commutation modes, namely S1, S2, S3 and S4, among which S1 and S4 are two small commutation paths. The commutation path of S1 is sequentially positive DC row, midpoint row, positive AC row, the first IGBT unit T1 of the first bridge arm and the second bridge arm, and the second IGBT unit T2 of the first bridge arm and the second bridge arm; the commutation path of S4 is sequentially negative DC row, midpoint row, negative AC row, the third IGBT unit T3 of the first bridge arm and the second bridge arm, and the fourth IGBT unit T4 of the first bridge arm and the second bridge arm. S2 and S3 are two large commutation paths, wherein the commutation path of S2 is, in sequence, the AC output row, the third IGBT unit T3 of the first bridge arm and the second bridge arm, the negative AC row, the fourth IGBT unit T4 of the first bridge arm and the second bridge arm, the negative DC row, the second capacitor group, the midpoint row, the fifth switch tube D5 of the first clamp switch group and the second clamp switch group, and the positive AC row; the commutation path of S3 is, in sequence, the AC output row, the second IGBT unit T2 of the first bridge arm and the second bridge arm, the positive AC row, the first IGBT unit T1 of the first bridge arm and the second bridge arm, the positive DC row, the first capacitor group C1, the midpoint row, the sixth switch tube D6 of the first clamp switch group and the second clamp switch group, and the negative AC row.
[0004] Figure 2 The structure diagram of the current conversion device in the prior art is shown; Figure 2As shown, in the prior art, the AC bus is staggered in design, the AC output bus 110 and the AC input bus 140 of the AC bus are close to the first side of the power device, and the negative AC bus 120 and the positive AC bus 130 of the AC bus are arranged on the second side of the power device, and the connection parts connected to the power unit are arranged on their respective left sides. It can be seen that based on the design structure of the above prior art, especially for the two large commutation paths S2 and S3, the path between the circuit and the device is farther and forms a loop, so there is a relatively larger stray inductance, especially in the process of IGBT shutdown, due to the large current conversion rate di / dt, a large voltage spike will be generated to act on the IGBT to damage it. Utility Model Content
[0005] In view of this, the utility model proposes a current conversion device, which at least solves the above problem of large stray inductance.
[0006] According to an embodiment of the utility model, a converter device includes a power device, an AC bus and a DC bus. The power device includes a first side and a second side arranged opposite to each other. The DC bus is arranged on the first side, including a negative DC bus, a midpoint bus, and a positive DC bus arranged in a stacked manner. A power module is installed on the power device. The power module includes first terminals arranged along the first side and second terminals arranged along the second side. The AC bus is arranged above the power module, including an AC output bus, a negative AC bus, and a positive AC bus arranged in a stacked manner. One end of the AC output bus close to the first side is connected to at least a portion of the first terminal, and one end of the negative AC bus and the positive AC bus close to the second side are respectively connected to the second terminal.
[0007] Furthermore, the AC output row, the negative AC row and the positive AC row are arranged in sequence up and down.
[0008] Furthermore, a first insulating layer is provided between the AC output bus and the negative AC bus, a second insulating layer is provided between the negative AC bus and the positive AC bus, and a third insulating layer is provided between the positive AC bus and the power module.
[0009] Furthermore, the AC busbar further comprises an AC input busbar, one end of which is connected to the AC output busbar, and the other end of which is arranged to extend toward the second side of the power device.
[0010] Furthermore, the AC bus is integrally and detachably mounted on the power device.
[0011] Furthermore, the DC bus is connected to at least a portion of the first terminals.
[0012] Furthermore, the converter device is a three-level I-type topology structure, including a first bridge arm, a second bridge arm, a first clamp switch group, a second clamp switch group, and a first capacitor group C1 and a second capacitor group C2. The first bridge arm and the second bridge arm have the same structure and are respectively connected in parallel between the DC bus bars, and each includes a first IGBT unit T1 and a second IGBT unit T2, a third IGBT unit T3 and a fourth IGBT unit T4 connected in series in sequence. The first clamp switch group and the second clamp switch group have the same structure and each includes a fifth switch tube D5 and a sixth switch tube D6 connected in series. The first capacitor group C1 is connected in parallel between the DC bus bar and a midpoint of the circuit, and the second capacitor group C2 is connected in parallel between the midpoint of the circuit and the DC bus bar.
[0013] Furthermore, the first capacitor group C1 and the second capacitor group C2 are arranged on the top of the DC bus 200 .
[0014] Furthermore, the power module includes a first power module, a second power module and a switch module, the first power module encapsulates the first IGBT unit T1 and the second IGBT unit T2 of the first bridge arm and the first IGBT unit T1 and the second IGBT unit T2 of the second bridge arm, the second power module encapsulates the third IGBT unit T3 and the fourth IGBT unit T4 of the first bridge arm and the third IGBT unit T3 and the fourth IGBT unit T4 of the second bridge arm, and the switch module encapsulates the fifth switch tube D5 and the sixth switch tube D6 of the first clamping switch group and the fifth switch tube D5 and the sixth switch tube D6 of the second clamping switch group.
[0015] Furthermore, the first terminal of the power module includes a connection terminal of the first IGBT unit T1 of the first bridge arm, the first IGBT unit T1 of the second bridge arm, the fifth switch tube D5 of the first clamp switch group, the fifth switch tube D5 of the second clamp switch group, the third IGBT unit T3 of the first bridge arm, and the third IGBT unit T3 of the second bridge arm; the second terminal includes a connection terminal of the second IGBT unit T2 of the first bridge arm, the second IGBT unit T2 of the second bridge arm, the sixth switch tube D6 of the first clamp switch group, the sixth switch tube D6 of the second clamp switch group, the fourth IGBT unit T4 of the first bridge arm, and the fourth IGBT unit T4 of the second bridge arm.
[0016] It can be seen from the above technical scheme that the converter device according to the embodiment of the utility model optimizes the structure and position of the AC bus. On the one hand, the AC bus is set to a structure of upper and lower stacked buses, and on the other hand, the position of the AC bus is set above the power module. The AC output bus is connected to the first terminal located on the first side of the AC device, and the positive AC bus and the positive AC bus are connected to the second terminal located on the second side, so that the connection path between the AC bus and the DC bus, the first capacitor group, the second capacitor group, and the first terminal and the second terminal of the power module is shorter, and no loop is formed, thereby reducing the stray inductance, and it is not easy to damage the components in the circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will be more aware of the above and other features and advantages of the present invention. In the accompanying drawings:
[0018] Figure 1 A topological structure of one phase of a current conversion device according to an embodiment of the utility model;
[0019] Figure 2 It is a structural schematic diagram of a current conversion device in the prior art;
[0020] Figure 3 It is a partial structural diagram of a current conversion device according to an embodiment of the utility model;
[0021] Figure 4 A schematic diagram of a commutation path of a current converter device in the prior art under the commutation path S2;
[0022] Figure 5 It is a schematic diagram of the commutation path of the converter device under the commutation path S2 according to one embodiment of the utility model;
[0023] Figure 6 A schematic diagram of a commutation path of a current converter device in the prior art under the commutation path S3;
[0024] Figure 7 It is a schematic diagram of the commutation path of the converter device under the commutation path S3 according to one embodiment of the utility model;
[0025] The reference numerals are as follows:
[0026] DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model is further described in detail with examples below.
[0028] Figure 1is a partial topological structure of a current conversion device according to an embodiment of the utility model; Figure 1 As shown, the converter device according to the embodiment of the utility model includes a first bridge arm, a second bridge arm, a first clamp switch group, a second clamp switch group, and a first capacitor group C1 and a second capacitor group C2. The first bridge arm and the second bridge arm have the same structure and are respectively connected in parallel between the DC busbars, and each includes a first IGBT unit T1 and a second IGBT unit T2, a third IGBT unit T3 and a fourth IGBT unit T4 connected in series in sequence. The first clamp switch group and the second clamp switch group have the same structure and each includes a fifth switch tube D5 and a sixth switch tube D6 connected in series. The first capacitor group C1 is connected in parallel between the DC busbar and the midpoint of the circuit, and the second capacitor group C2 is connected in parallel between the midpoint of the circuit and the DC busbar.
[0029] It should be noted that the converter device of the utility model can also be other types of topological structures or deformations of the three-level I-type topological structure. It can be imagined that as long as the invention is based on the embodiment of the utility model and realizes the reduction of stray inductance by optimizing the structure and position of the AC bus, it should belong to the protection scope of the utility model.
[0030] Figure 3 FIG. 1 is a partial structural diagram of a current conversion device according to an embodiment of the utility model; Figure 3 As shown, a converter device according to an embodiment of the present utility model includes a power device 100, an AC bus and a DC bus 200 (see Figure 2 The DC bus 200 in the prior art) is a power device including a first side and a second side that are arranged oppositely. The DC bus is arranged on the first side, including a negative DC bus, a midpoint bus, and a positive DC bus that are arranged in a stacked manner. A power module is installed on the power device. The power module includes a first terminal arranged along the first side and a second terminal arranged along the second side. The AC bus is arranged above the power module, including an AC output bus 10, a negative AC bus 20, and a positive AC bus 30 that are arranged in a stacked manner. The end of the AC output bus 10 close to the first side is connected to at least a part of the first terminal, and the ends of the negative AC bus 20 and the positive AC bus 30 close to the second side are respectively connected to the second terminal. Specifically, three power modules are installed on the power device 100 through fasteners such as bolts. The power module can be, for example, an EconoDual module. The DC bus 200 is installed on the first side of the power device in the form of a stacked bus, including a negative DC bus, a midpoint bus, and a positive DC bus that are arranged in a stacked manner; the AC bus is arranged on the right side of the DC bus, and is also a stacked structure. Based on this embodiment, the AC bus is changed from the original staggered design to a stacked design, forming a whole stacked plate structure installed above the power device; and the left side of the AC output bus is connected to the first terminal, and the right sides of the positive AC bus and the negative AC bus are connected to the second terminal, so that the commutation path is shortened and the formation of a loop is avoided, thereby achieving the effect of reducing stray inductance.
[0031] Furthermore, the power device also includes a heat sink, which is installed below the power module. The heat sink, for example, includes a cooling fan.
[0032] Furthermore, the AC output row 10, the negative AC row 20 and the positive AC row 30 are arranged in sequence. This design facilitates the AC input row to be led out from the AC output row, and matches the arrangement position of the first terminal and the second terminal of the power module, so that the path is optimal.
[0033] Further, the AC bus includes an AC input bus 40, one end of which is connected to the AC output bus, and the other end of which is configured to extend toward the second side of the power device. Specifically, the AC input bus is connected to the AC output bus through a connecting member such as a bolt, and extends to connect to the load end. The AC input bus is configured to extend perpendicular to the direction in which the first side extends, and parallel to the direction in which the power device extends, to achieve a relatively shortest path.
[0034] Furthermore, a first insulating layer (not shown in the drawings) is provided between the AC output row 10 and the negative AC row 20, a second insulating layer (not shown in the drawings) is provided between the negative AC row 20 and the positive AC row 30, and a third insulating layer (not shown in the drawings) is provided between the positive AC row 30 and the power module. Based on this embodiment, insulation between the layers of the AC stack and insulation between the AC stack and the power module are achieved. Preferably, insulating paper is used as the insulating layer.
[0035] Furthermore, the AC bus is integrally and detachably mounted on the power device. Based on this embodiment, installation and disassembly can be performed more conveniently.
[0036] Furthermore, the DC bus is connected to at least a portion of the first terminal. Combined with the DC bus being designed on the first side of the power device, this design makes the path from the DC bus to the connection terminal of the power unit shorter.
[0037] Furthermore, a fourth insulating layer is provided between the negative DC row and the midpoint row, a fifth insulating layer is provided between the midpoint row and the positive DC row, and a sixth insulating layer is provided between the positive DC row and the power module. Based on this embodiment, insulation is performed between the layers of the DC stack and between the DC stack and the power module. Preferably, insulating paper is used as the insulating layer.
[0038] Furthermore, the first capacitor group C1 and the second capacitor group C2 are arranged on the top of the DC busbar. This design has a compact structure and realizes path optimization.
[0039] Furthermore, the power module includes a first power module, a second power module and a switch module, wherein the first power module encapsulates the first IGBT unit T1 and the second IGBT unit T2 of the first bridge arm and the first IGBT unit T1 and the second IGBT unit T2 of the second bridge arm, the second power module encapsulates the third IGBT unit T3 and the fourth IGBT unit T4 of the first bridge arm and the third IGBT unit T3 and the fourth IGBT unit T4 of the second bridge arm, and the switch module encapsulates the fifth switch tube D5 and the sixth switch tube D6 of the first clamp switch group and the fifth switch tube D5 and the sixth switch tube D6 of the second clamp switch group. Based on the structure of this embodiment, the power module has a compact structure, is easy to install and disassemble, and has a simpler connection route with the DC bus and the AC bus.
[0040] Further, the first terminal of the power device includes the first IGBT unit T1 of the first bridge arm, the first IGBT unit T1 of the second bridge arm, the fifth switch tube D5 of the first clamp switch group, the fifth switch tube D5 of the second clamp switch group, the third IGBT unit T3 of the first bridge arm, and the third IGBT unit T3 of the second bridge arm, which are connected to the first side of the power device; the second terminal includes the second IGBT unit T2 of the first bridge arm, the second IGBT unit T2 of the second bridge arm, the sixth switch tube D6 of the first clamp switch group, the sixth switch tube D6 of the second clamp switch group, the fourth IGBT unit T4 of the first bridge arm, and the fourth IGBT unit T4 of the second bridge arm. Based on this structure, the connection path with the DC bus and the AC bus is better and the structure is clear.
[0041] Figure 4 A schematic diagram of a commutation path of a current converter device in the prior art under the commutation path S2; Figure 5 It is a schematic diagram of the commutation path of the converter device under the commutation path S2 according to one embodiment of the utility model;
[0042] like Figure 4 and Figure 5 As shown in the prior art or in the embodiments according to the present invention, when the converter device is in the commutation path S2, the commutation paths are sequentially: the AC output row, the third IGBT unit T3 of the first bridge arm and the second bridge arm, the negative AC row, the fourth IGBT unit T4 of the first bridge arm and the second bridge arm, the negative DC row, the second capacitor group, the midpoint row, the fifth switch tube D5 of the first clamp switch group and the second clamp switch group, and the positive AC row; the difference between the two is exemplarily introduced below. Figure 4 In the prior art shown, when the third IGBT unit T3 flows to the negative AC bus, when the fourth IGBT unit T4 flows to the negative DC bus, and when the fifth switch tube D5 flows to the positive AC bus, they all need to cross the distance from the first terminal to the second terminal. However, the solution of the present invention saves the above flow path.
[0043] Figure 6 A schematic diagram of a commutation path of a current converter device in the prior art under the commutation path S3; Figure 7 It is a schematic diagram of the commutation path of the converter device under the commutation path S3 according to one embodiment of the utility model;
[0044] like Figure 6 and Figure 7 As shown, whether it is the prior art or the embodiment of the present invention, when the converter device is in the commutation path S3, the commutation path is sequentially: AC output row, the second IGBT unit T2 of the first bridge arm and the second bridge arm, the positive AC row, the first IGBT unit T1 of the first bridge arm and the second bridge arm, the positive DC row, the first capacitor group C1, the midpoint row, the sixth switch tube D6 of the first clamp switch group and the second clamp switch group, and the negative AC row. The following is an exemplary introduction to the difference between the two. Figure 6 In the prior art shown, when the AC output bus flows to the second IGBT unit T2, when the positive AC bus flows to the first IGBT unit T1, and when the midpoint bus flows to the sixth switch tube D6, it is necessary to cross the distance from the first terminal to the second terminal. The solution of the present invention saves the above flow paths.
[0045] It can be seen that the current conversion device according to the embodiment of the utility model reduces the stray inductance of the commutation path by adjusting the space and position of the current path through which the stacked array of power modules passes.
[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A current conversion device, characterized in that: The invention comprises a power device (100), an AC bus and a DC bus (200), wherein the power device (100) comprises a first side and a second side arranged opposite to each other, the DC bus (200) is arranged on the first side and comprises a negative DC bus, a midpoint bus and a positive DC bus arranged in layers, a power module is installed on the power device, the power module comprises first terminals arranged along the first side and second terminals arranged along the second side, the AC bus is arranged above the power module and comprises an AC output bus (10), a negative AC bus (20) and a positive AC bus (30) arranged in layers, one end of the AC output bus close to the first side is connected to at least a portion of the first terminal, and one end of each of the positive AC bus and the negative AC bus close to the second side is connected to the second terminal respectively.
2. The current conversion device according to claim 1, characterized in that: The AC output row (10), the negative AC row (20), and the positive AC row (30) are arranged in sequence up and down.
3. The current conversion device according to claim 1, characterized in that: A first insulating layer is provided between the AC output bus (10) and the negative AC bus (20), a second insulating layer is provided between the negative AC bus (20) and the positive AC bus (30), and a third insulating layer is provided between the positive AC bus (30) and the power module.
4. The current conversion device according to claim 1, characterized in that: The AC busbar further comprises an AC input busbar (40), one end of which is connected to the AC output busbar (10), and the other end of which is arranged to extend towards the second side of the power device (100).
5. The current conversion device according to claim 1, characterized in that: The AC bus is integrally and detachably mounted on the power device (100).
6. The current conversion device according to claim 1, characterized in that: The DC bus (200) is connected to at least a portion of the first terminals.
7. The current conversion device according to claim 1, characterized in that: The converter device is a three-level I-type topology structure, comprising a first bridge arm, a second bridge arm, a first clamp switch group, a second clamp switch group, a first capacitor group (C1) and a second capacitor group (C2); the first bridge arm and the second bridge arm have the same structure, are respectively connected in parallel between DC buses, and each comprises a first IGBT unit (T1) and a second IGBT unit (T2), a third IGBT unit (T3) and a fourth IGBT unit (T4) connected in series in sequence; the first clamp switch group and the second clamp switch group have the same structure, each comprises a fifth switch tube (D5) and a sixth switch tube (D6) connected in series; the first capacitor group (C1) is connected in parallel between the DC bus and a circuit midpoint, and the second capacitor group (C2) is connected in parallel between the circuit midpoint and the DC bus.
8. The current conversion device according to claim 7, characterized in that: The first capacitor group (C1) and the second capacitor group (C2) are arranged on top of the DC bus (200).
9. The current conversion device according to claim 7, characterized in that: The power module comprises a first power module, a second power module and a switch module, wherein the first power module encapsulates a first IGBT unit (T1) and a second IGBT unit (T2) of the first bridge arm and a first IGBT unit (T1) and a second IGBT unit (T2) of the second bridge arm, the second power module encapsulates a third IGBT unit (T3) and a fourth IGBT unit (T4) of the first bridge arm and a third IGBT unit (T3) and a fourth IGBT unit (T4) of the second bridge arm, and the switch module encapsulates a fifth switch tube (D5) and a sixth switch tube (D6) of the first clamp switch group and a fifth switch tube (D5) and a sixth switch tube (D6) of the second clamp switch group.
10. The current conversion device according to claim 7, characterized in that: The first terminal of the power module includes a first IGBT unit (T1) of the first bridge arm, a first IGBT unit (T1) of the second bridge arm, a fifth switch tube (D5) of the first clamp switch group, a fifth switch tube (D5) of the second clamp switch group, a third IGBT unit (T3) of the first bridge arm, and a connection terminal of the third IGBT unit (T3) of the second bridge arm; the second terminal includes a second IGBT unit (T2) of the first bridge arm, a second IGBT unit (T2) of the second bridge arm, a sixth switch tube (D6) of the first clamp switch group, a sixth switch tube (D6) of the second clamp switch group, a fourth IGBT unit (T4) of the first bridge arm, and a connection terminal of the fourth IGBT unit (T4) of the second bridge arm.