Inverter structure for reducing stress of switching tube

Abstract

The utility model discloses an inverter structure capable of reducing stress of a switch tube, which relates to the technical field of inverters and comprises a PCB (printed circuit board), a radiator, a fixing seat, the switch tube, a BUS + copper bar, a BUS-copper bar, a capacitor filter board, an electrolytic capacitor, a screw, an L-line copper bar and an N-line copper bar. The switch tube is fixedly connected to the radiator through the fixing seat and then is welded to the PCB. The BUS + copper bar, the BUS-copper bar, the L-line copper bar and the N-line copper bar are also welded on the PCB; the electrolytic capacitor is installed on the capacitor filter plate, and the capacitor filter plate is fixed on the BUS + copper bar and the BUS-copper bar through the screws. According to the utility model, the problem of overhigh stress of the switch tube is solved, an engineer does not need to select a switch tube with a higher voltage level, the production cost is reduced, the problem of overhigh stress can be solved without sacrificing certain efficiency of the inverter, and the performance of the inverter is improved. And meanwhile, the design is convenient to assemble and maintain, the production cost is reduced, and the production quality is improved.

Description

Technical Field

[0001] This utility model belongs to the field of inverter technology, specifically relating to an inverter structure that reduces the stress on the switching transistor. Background Technology

[0002] With the development of clean energy sources such as solar power generation, the market demand for inverters is constantly increasing. Especially in countries in Asia, Africa, and Latin America that are frequently plagued by power outages, more and more users are using inverters as backup power for their homes. In this case, the stability, reliability, and safety of the inverter will affect the sales of the product in the future. In order to meet these requirements, a stable, reliable, and safe inverter is needed. However, inverters on the market still have the problem of excessive stress on the switching transistors in their design, which affects the stability, reliability, and safety of the inverter.

[0003] The shortcomings and deficiencies of existing technology: When designing inverters, the stress on the switching transistors is too high. Engineers need to select switching transistors with a higher voltage level. However, the higher voltage level switching transistors not only increase the cost, but also sacrifice some of the inverter's efficiency due to the increased transistor voltage drop in order to solve the problem of excessive stress. This is unfavorable to both users and suppliers.

[0004] To address this, we propose an inverter structure that reduces the stress on the switching transistors. Utility Model Content

[0005] The purpose of this invention is to address the problem of excessive stress on the switching transistors in existing inverter designs by providing an inverter structure that reduces the stress on the switching transistors.

[0006] This utility model is achieved through the following technical solution: an inverter structure that reduces the stress of the switching transistor, including a PCB board, a heat sink, a mounting base, a switching transistor, a BUS+ copper busbar, a BUS- copper busbar, a capacitor filter board, an electrolytic capacitor, screws, an L-line copper busbar, and an N-line copper busbar.

[0007] The switching transistor is fixedly connected to the heat sink via the mounting bracket and then soldered to the PCB board; the BUS+ copper busbar, BUS- copper busbar, L-line copper busbar and N-line copper busbar are also soldered to the PCB board.

[0008] The electrolytic capacitor is mounted on the capacitor filter board, and the capacitor filter board is fixed to the BUS+ copper busbar and the BUS- copper busbar by the screws.

[0009] Preferably, there are four switching transistors, namely switching transistor Q1, switching transistor Q2, switching transistor Q3, and switching transistor Q4.

[0010] Preferably, the drain (D) terminal of the switching transistor Q1 is connected to the BUS+ copper busbar, and the source (S) terminal of the switching transistor Q1 is connected to the L-line copper busbar.

[0011] Preferably, the drain (D) terminal of the switching transistor Q2 is connected to the L-line copper busbar, and the source (S) terminal of the switching transistor Q2 is connected to the BUS-line copper busbar.

[0012] Preferably, the drain (D) terminal of the switching transistor Q3 is connected to the BUS+ copper busbar, and the source (S) terminal of the switching transistor Q3 is connected to the N-line copper busbar.

[0013] Preferably, the drain (D) terminal of the switching transistor Q4 is connected to the neutral (N) copper busbar, and the source (S) terminal of the switching transistor Q4 is connected to the busbar (BUS).

[0014] This invention has the following advantages over the prior art:

[0015] 1. The structural design of this utility model, in which the switching transistor is fixedly connected to the heat sink via a mounting bracket and then soldered onto the PCB board, solves the problem of excessive stress on the switching transistor. Engineers do not need to select a switching transistor with a higher voltage level, reducing production costs. Furthermore, it avoids sacrificing some inverter efficiency to address the excessive stress issue, thus improving inverter performance. This design also facilitates assembly and maintenance, further reducing production costs and improving production quality. Attached Figure Description

[0016] Figure 1 A top view of an inverter structure designed to reduce stress on the switching transistors;

[0017] Figure 2 A front view of an inverter structure designed to reduce stress on the switching transistors;

[0018] Figure 3 This is a top view of a capacitor filter board in an inverter structure designed to reduce stress on the switching transistors.

[0019] The following are the labels in the diagram: 1. PCB board; 2. Mounting bracket; 3. Heat sink; 4. Switching transistor; 5. BUS+ copper busbar; 6. BUS- copper busbar; 7. Capacitor filter board; 8. Electrolytic capacitor; 9. Screw; 10. L-line copper busbar; 11. N-line copper busbar. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] For examples, please refer to Figures 1-3An inverter structure for reducing the stress on the switching transistor includes a PCB board 1, a heat sink 3, a mounting base 2, a switching transistor 4, a BUS+ copper busbar 5, a BUS- copper busbar 6, a capacitor filter board 7, an electrolytic capacitor 8, screws 9, an L-line copper busbar 10, and an N-line copper busbar 11.

[0022] The switching tube 4 is fixedly connected to the heat sink 3 through the mounting bracket 2, and then soldered to the PCB board 1; the BUS+ copper busbar 5, BUS- copper busbar 6, L-line copper busbar 10 and N-line copper busbar 11 are also soldered to the PCB board 1.

[0023] Electrolytic capacitor 8 is mounted on capacitor filter board 7, which is then fixed to BUS+ copper busbar 5 and BUS- copper busbar 6 by screws 9. This completes the design process for reducing the stress on the switching transistors of the bridge inverter.

[0024] There are four switching transistors (4 in total): Q1, Q2, Q3, and Q4. The drain (D) of transistor Q1 is connected to the BUS+ copper busbar 5, and the source (S) of transistor Q1 is connected to the L-line copper busbar 10. The drain (D) of transistor Q2 is connected to the L-line copper busbar 10, and the source (S) of transistor Q2 is connected to the BUS- copper busbar. The drain (D) of transistor Q3 is connected to the BUS+ copper busbar 5, and the source (S) of transistor Q3 is connected to the N-line copper busbar 11. The drain (D) of transistor Q4 is connected to the N-line copper busbar 11, and the source (S) of transistor Q4 is connected to the BUS- copper busbar.

[0025] Working principle:

[0026] like Figure 1 As shown, during the positive half-cycle of the inverter, the power supply current flows from the positive terminal of the bus electrolytic capacitor 8 through the BUS+ copper busbar 5 into the drain terminal of the switching transistor Q1, then flows out from the source terminal of the switching transistor Q1 to the L-line copper busbar 10, the filter device and the load, then flows back from the load to the N-line copper busbar 11, flows in through the drain terminal of the switching transistor Q4, flows out from the source terminal of the switching transistor Q4 to the BUS- copper busbar 6, and then to the negative terminal of the bus electrolytic capacitor 8, completing the circuit and achieving the shortest possible circuit. The principle is the same during the negative half-cycle of the inverter.

[0027] In this invention, the switching transistor 4 is fixedly connected to the heat sink 3 via the mounting base 2 and then soldered onto the PCB board 1. This structural design solves the problem of excessive stress on the switching transistor 4. Engineers do not need to select a switching transistor 4 with a higher voltage level, reducing production costs. Furthermore, it avoids sacrificing some inverter efficiency to address the excessive stress issue, thus improving inverter performance. This design also facilitates assembly and maintenance, further reducing production costs and improving production quality.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An inverter structure for reducing stress of switching tubes, comprising a PCB board (1), a heat sink (3), a fixing base (2), switching tubes (4), a BUS+ copper bar (5), a BUS- copper bar (6), a capacitor filter board (7), an electrolytic capacitor (8), a screw (9), an L line copper bar (10) and an N line copper bar (11); characterized in that: the switching tubes (4) are fixedly connected to the heat sink (3) through the fixing base (2) and are welded to the PCB board (1); the BUS+ copper bar (5), the BUS- copper bar (6), the L line copper bar (10) and the N line copper bar (11) are also welded to the PCB board (1); the electrolytic capacitor (8) is mounted on the capacitor filter board (7), and the capacitor filter board (7) is fixed to the BUS+ copper bar (5) and the BUS- copper bar (6) through the screw (9). The switching tubes (4) are four, namely switching tube Q1, switching tube Q2, switching tube Q3 and switching tube Q4. The D pole of the switching tube Q1 is connected to the BUS+ copper bar (5), and the S pole of the switching tube Q1 is connected to the L line copper bar (10).

2. The inverter structure of claim 1, wherein, The D pole of the switching tube Q2 is connected to the L line copper bar (10), and the S pole of the switching tube Q2 is connected to the BUS- copper bar.

3. The inverter structure of claim 2, wherein, The D pole of the switching tube Q3 is connected to the BUS+ copper bar (5), and the S pole of the switching tube Q3 is connected to the N line copper bar (11).

4. The inverter structure of claim 2, wherein, The D pole of the switching tube Q4 is connected to the N line copper bar (11), and the S pole of the switching tube Q4 is connected to the BUS- copper bar.

5. The inverter structure of claim 2, wherein, ​ 6. The inverter structure of claim 2, wherein, ​

Images