Power tube layout structure of inverter three-leg circuit board and split-phase inverter
By placing the N-phase bridge arm module between phases L1 and L2 on the inverter's three-bridge arm circuit board, and arranging the power transistors at the corners, the problem of heat accumulation in the L1 and L2 phase power transistors of the inverter is solved, achieving an effective reduction in temperature without increasing the circuit board area.
Patent Information
- Application Number
- CN202423249366.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-27
AI Technical Summary
On existing inverter three-bridge circuit boards, the heat generated by the L1 and L2 phase power transistors accumulates, causing a rapid increase in local temperature, which affects the inverter's operation and safety. Furthermore, the area and volume of the circuit board are adjusted by increasing the spacing between the transistors.
On the circuit board, the N-phase bridge arm module is placed between the L1-phase and L2-phase bridge arm modules. The N-phase bridge arm module isolates the L1-phase and L2-phase bridge arm modules. The power transistors are located at the four corners of the circuit board to separate high-heat areas and prevent heat from accumulating rapidly.
It effectively reduced the temperature of the L1 and L2 phase bridge arm modules, with a significant cooling effect. The temperature rise of the power transistors was improved by about 10°C, and the temperature rise of some power transistors was improved by more than 15°C. The high temperature problem was solved without increasing the circuit board area.
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Figure CN223666261U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to energy storage inverter device especially a three bridge arm circuit board power tube layout structure and split phase inverter. BACKGROUND
[0002] In the power supply system of the North American country, dual fire line (L1-L2) or single fire line (L1-N and / or L2-N) and dual fire line parallel (L1 / L2-N) mode are generally used, and flexible switching among the three modes can be realized, so the corresponding power supply output mode of the energy storage equipment such as photovoltaic is required. The split phase inverter is an effective way to realize the power supply output mode, and the split phase inverter is a special form of inverter, which is characterized in that the input AC signal is divided into two paths, and then delayed and inverted, so as to realize the control and optimization of the output waveform. This split phase technology can make the output waveform more pure, reduce harmonics and noise, and improve the power quality. In order to realize the above control, in the existing split phase energy storage inverter, a three bridge arm topology is used, and DC-AC conversion is realized through L1 phase, L2 phase and N phase three bridge arms. Two power tubes (IGBT) are used in each bridge arm to realize DC-AC conversion. On the existing inverter three bridge arm circuit board, L1 phase, L2 phase and N phase are usually arranged in sequence. Since the power tubes on L1 phase and L2 phase generate a large amount of heat during operation, the heat generated by the power tubes in L1 phase and L2 phase is accumulated when L1 phase and L2 phase are arranged close to each other, which causes the local temperature to rise rapidly, and the heat is difficult to dissipate quickly. According to tests, the temperature of some power tubes will exceed 100 DEG C under the working condition of 30 minutes, which has a great negative impact on the working performance and safety of the inverter. Adjusting the distance between L1 and L2 through spacing will also increase the area of the circuit board and the volume of the product. SUMMARY
[0003] In a first aspect, the embodiments of the present application provide an inverter three bridge arm circuit board power tube layout structure for solving the high working temperature caused by heat accumulation in the L1 and L2 areas of the existing inverter three bridge arm circuit board.
[0004] The inverter three bridge arm circuit board power tube layout structure comprises:
[0005] L1 phase bridge arm module, L2 phase bridge arm module and N phase bridge arm module, the L1 phase bridge arm module, the L2 phase bridge arm module and the N phase bridge arm module comprise IGBT units respectively, and the improvement lies in that:
[0006] The N phase bridge arm module is arranged between the L1 phase bridge arm module and the L2 phase bridge arm module on the circuit board.
[0007] Due to the above layout, without changing the overall area of the L1 phase bridge arm module, the L2 phase bridge arm module and the N phase bridge arm module on the circuit board, the main heat source L1 phase bridge arm module and the L2 phase bridge arm module are separated by the N phase bridge arm module. Since the N phase bridge arm module only has power when the L1 phase bridge arm module and the L2 phase bridge arm module drive unbalanced loads, the N phase bridge arm module usually generates much less heat than the L1 phase bridge arm module and the L2 phase bridge arm module. Therefore, the two high-heat areas can be effectively separated by the low-heat area, avoiding the problem of high temperature caused by the rapid accumulation of heat in a small area.
[0008] In a possible implementation, the power tube unit of the L1 phase bridge arm module includes an L1 phase upper tube unit and an L1 phase lower tube unit, and each of the L1 phase upper tube unit and the L1 phase lower tube unit includes two parallel power tubes.
[0009] In a possible implementation, the two power tubes in the L1 phase upper tube unit and the two power tubes in the L1 phase lower tube unit in the L1 phase bridge arm module are located at four corners of the circuit board region where the L1 phase bridge arm module is located.
[0010] In a possible implementation, the power tube unit of the L2 phase bridge arm module includes an L2 phase upper tube unit and an L2 phase lower tube unit, and each of the L2 phase upper tube unit and the L2 phase lower tube unit includes two parallel power tubes.
[0011] In a possible implementation, the two power tubes in the L2 phase upper tube unit and the two power tubes in the L2 phase lower tube unit in the L2 phase bridge arm module are located at four corners of the circuit board region where the L2 phase bridge arm module is located.
[0012] In a possible implementation, the power tube unit of the N phase bridge arm module includes an N phase upper tube unit and an N phase lower tube unit, and each of the N phase upper tube unit and the N phase lower tube unit includes two parallel power tubes.
[0013] In a possible implementation, the two power tubes in the N phase upper tube unit and the two power tubes in the N phase lower tube unit in the N phase bridge arm module are located at four corners of the circuit board region where the N phase bridge arm module is located. In a second aspect, the embodiments of the present application also provide a split-phase inverter, including a three-bridge-arm circuit board, and the three-bridge-arm circuit board includes the power tube layout structure of the inverter three-bridge-arm circuit board in the first aspect. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 The schematic diagram of the overall layout structure of the circuit board of the first embodiment;
[0015] Figure 2A schematic diagram of a three-leg module region layout structure of a first embodiment. DETAILED DESCRIPTION
[0016] It should be apparent that the described embodiments are only some embodiments and not all embodiments. Based on the embodiments below, all other embodiments obtained by those of ordinary skill in the art without creative labor are also within the scope of protection of the present application.
[0017] It should be understood that in the embodiments, all directional terms such as "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship used in use, and are only for the convenience of simplifying the description, and do not mean that the device, element or component indicated thereby must have a specific orientation and a specific orientation structure, and should not be understood as a limitation on the embodiments. It is only used to explain the relative positional relationship, movement condition, etc. between the components shown in the drawings, and when the specific posture changes, the directional indication may also change accordingly.
[0018] In addition, ordinal numbers such as "first", "second", etc. in the embodiments are only for distinguishing purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined as "first" and "second" can explicitly or implicitly indicate at least one of the technical features. In the description of the embodiments, "a plurality of" means at least two, that is, two or more, unless otherwise explicitly limited; "at least one" means one or more.
[0019] In the embodiments, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "threading", etc. should be understood broadly, for example, the positional relationship between the components can be relatively fixed, or there can be a physically fixed connection between the components, which can be detachable or integrated structure; it can be mechanical connection or electrical signal connection; it can be direct connection or indirect connection through intermediate media or components; it can be internal communication between two elements or interaction relationship between two elements, and the specific connection mode should be understood according to the device properties, and unless the specification is explicitly limited, it cannot be understood as other understanding which can achieve the corresponding function or effect. For those of ordinary skill in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0020] The controller and control circuit involved in the embodiments are the control technology or units that are conventional for those skilled in the art, and the control circuit of the controller can be implemented by those skilled in the art using existing technology, such as simple programming. The software or program involved in the control result achieved in cooperation with the hardware, such as the control process of the software or program not described in detail, belongs to the conventional technology of those skilled in the art. The power supply also uses the existing technology in the art, and the main technical point is the improvement of the mechanical device, so the specific circuit control relationship and circuit connection are not described in detail in the embodiments.
[0021] The disclosure of the embodiments provides many different implementations or examples to implement different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described in the embodiments. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, reference numerals and / or reference letters can be repeated in different examples in the embodiments. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various implementations and / or settings discussed per se. In addition, if examples of various specific processes and materials are provided in the embodiments, those skilled in the art can realize the application of other processes and / or the use of other materials.
[0022] The preferred embodiments of the application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used for description and explanation, and do not limit the protection scope of the application.
[0023] The embodiments of the application mainly relate to the layout improvement of the split-phase inverter circuit board, and specifically, the layout improvement of the inverter three-bridge arm power tube of the split-phase inverter, so the main content is described around the layout of the inverter three-bridge arm power tube, which does not represent that the split-phase inverter circuit board only includes the inverter three-bridge arm power tube circuit. Generally, as shown in the drawings, Figure 1 The split-phase inverter circuit board mainly includes a direct current side power circuit 1, a bus capacitor 2 and an inverter three-bridge arm power tube circuit 3. Since the main heat source of such a split-phase inverter circuit board comes from the power tube in the inverter three-bridge arm power tube circuit 3, the embodiments do not have other special description for the direct current side power circuit 1 and the bus capacitor 2, and the specific arrangement can refer to the layout and circuit connection of the conventional direct current side power circuit 1 and bus capacitor 2.
[0024] In combination with Figure 1 and Figure 2 The inverter three-bridge arm circuit board power tube layout structure of the first embodiment of the application includes:
[0025] L1 phase bridge arm module 31, L2 phase bridge arm module 32 and N phase bridge arm module 33, the L1 phase bridge arm module 31, L2 phase bridge arm module 32 and N phase bridge arm module 33 respectively include power tube unit, the improvement point of the embodiment is that the N phase bridge arm module 33 is arranged between the L1 phase bridge arm module 31 and L2 phase bridge arm module 32 on the circuit board.
[0026] Since the above scheme is adopted, in the case that the overall area of the L1 phase bridge arm module 31, the L2 phase bridge arm module 32 and the N phase bridge arm module 33 on the circuit board is not changed, the main heat source L1 phase bridge arm module 31 and L2 phase bridge arm module 32 are separated by the N phase bridge arm module 33, and since the N phase bridge arm module 33 only has power when the L1 phase bridge arm module 31 and the L2 phase bridge arm module 32 drive unbalanced loads, the N phase bridge arm module 33 usually generates much less heat than the L1 phase bridge arm module 31 and the L2 phase bridge arm module 32, so the two high-heat areas can be effectively separated, and the high-temperature problem caused by the rapid accumulation of heat in a small area can be avoided.
[0027] In the embodiment, the power tube unit of the L1 phase bridge arm module 31 includes an L1 phase upper tube unit 311 and an L1 phase lower tube unit 312, and the L1 phase upper tube unit 311 and the L1 phase lower tube unit 312 respectively include two parallel power tubes. Figure 2 In the embodiment, the L1 phase upper tube unit 311 includes power tubes IGBT5 and IGBT6, and the L1 phase lower tube unit 312 includes power tubes IGBT7 and IGBT8.
[0028] Since the IGBT5, IGBT6, IGBT7 and IGBT8 are power tubes on the L1 phase bridge arm module 31, they generate a large amount of heat during operation, and the temperature rises rapidly after the heat accumulates, in order to further disperse the heat source in the limited space, in the embodiment, the two power tubes IGBT5 and IGBT6 in the L1 phase upper tube unit and the two power tubes IGBT7 and IGBT8 in the L1 phase lower tube unit in the L1 phase bridge arm module are arranged at the four corners of the circuit board area where the L1 phase bridge arm module is located.
[0029] The L2 phase bridge arm module in the embodiment includes an L2 phase upper tube unit and an L2 phase lower tube unit, and the L2 phase upper tube unit and the L2 phase lower tube unit respectively include two parallel power tubes. Figure 2 In the embodiment, the L2 phase upper tube unit 311 includes power tubes IGBT13 and IGBT14, and the L2 phase lower tube unit 312 includes power tubes IGBT15 and IGBT16.
[0030] Similarly, in order to further disperse the heat source by using limited space, in the city embodiment, the two power tubes IGBT13 and IGBT14 in the L2 phase upper tube unit and the two power tubes IGBT15 and IGBT16 in the L2 phase lower tube unit in the L2 phase bridge arm module are located at the four corners of the circuit board area where the L2 phase bridge arm module is located.
[0031] Further, the N phase bridge arm module includes an N phase upper tube unit and an N phase lower tube unit, and the phase upper tube unit and the phase lower tube unit respectively include two parallel power tubes, and Figure 2 In the city embodiment, the N phase upper tube unit 311 includes power tubes IGBT9 and IGBT10, and the N phase lower tube unit 312 includes power tubes IGBT11 and IGBT12.
[0032] Similarly, in order to further disperse the heat source by using limited space, in the city embodiment, the two power tubes IGBT9 and IGBT10 in the phase upper tube unit and the two power tubes IGBT11 and IGBT12 in the phase lower tube unit in the N phase bridge arm module are located at the four corners of the circuit board area where the N phase bridge arm module is located.
[0033]
[0034] Table 1
[0035]
[0036] Table 2
[0037] Through the above setting, it can be measured that when the inverter device runs for 30 minutes, the working temperature of each power tube is as shown in Table 1, and under the same conditions, when the original L1 phase bridge arm module, L2 phase bridge arm module and N phase bridge arm module are arranged in turn, the measured working temperature of each power tube is as shown in Table 2, and through comparison, it can be known that the overall temperature rise of the power tubes in the L1 phase bridge arm module and the L2 phase bridge arm module is improved by about 10℃ than before the layout optimization improvement, and the temperature rise of individual power tubes is improved by more than 15℃. The cooling effect is very obvious.
[0038] The second embodiment of the application also provides a split-phase inverter, which includes a three-bridge-arm circuit board, and the three-bridge-arm circuit board includes the inverter three-bridge-arm circuit board power tube layout structure in the first embodiment.
[0039] The above is only the preferred embodiment of the embodiment of the application, and does not limit the disclosure range of the embodiment of the application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and drawings of the embodiment of the application, or directly or indirectly applied in other related technical fields, are also included in the patent protection range supported by the embodiment of the application.
Claims
1. A layout structure of power tubes on an inverter three-leg circuit board, comprising: an L1-phase leg module, an L2-phase leg module and an N-phase leg module, the L1-phase leg module, the L2-phase leg module and the N-phase leg module each comprising a power tube unit, characterized in that: the N-phase leg module is arranged between the L1-phase leg module and the L2-phase leg module on the circuit board.
2. The inverter three-bride-arm circuit board power tube layout structure of claim 1, wherein, the power tube unit of the L1-phase leg module comprises an L1-phase upper tube unit and an L1-phase lower tube unit, each of the L1-phase upper tube unit and the L1-phase lower tube unit comprising two parallel power tubes.
3. The layout structure of power tubes of the three-bridge-arm inverter circuit board according to claim 2, wherein, the two power tubes in the L1-phase upper tube unit and the two power tubes in the L1-phase lower tube unit in the L1-phase leg module are located at four corners of a region of the circuit board where the L1-phase leg module is located.
4. The layout structure of power devices for the three-bridge-leg inverter circuit board according to claim 1, wherein, the power tube unit of the L2-phase leg module comprises an L2-phase upper tube unit and an L2-phase lower tube unit, each of the L2-phase upper tube unit and the L2-phase lower tube unit comprising two parallel power tubes.
5. The inverter three-bride-arm circuit board power tube layout structure of claim 4, wherein, the two power tubes in the L2-phase upper tube unit and the two power tubes in the L2-phase lower tube unit in the L2-phase leg module are located at four corners of a region of the circuit board where the L2-phase leg module is located.
6. The layout structure of power devices for the three-bridge-leg inverter circuit board according to claim 1, wherein, the power tube unit of the N-phase leg module comprises an N-phase upper tube unit and an N-phase lower tube unit, each of the N-phase upper tube unit and the N-phase lower tube unit comprising two parallel power tubes.
7. The layout structure of power devices of the three-bridge-leg inverter circuit board according to claim 6, wherein, the two power tubes in the N-phase upper tube unit and the two power tubes in the N-phase lower tube unit in the N-phase leg module are located at four corners of a region of the circuit board where the N-phase leg module is located.
8. A split-phase inverter, characterized by, a three-leg circuit board comprising the layout structure of power tubes on an inverter three-leg circuit board according to any one of claims 1-7.