Inverter structure for switching power supply

Abstract

The utility model discloses an inverter structure used for a switching power supply, comprising a rectification module, a first filter capacitor, a first IGBT inversion module, a second IGBT inversion module and a second filter capacitor which are directly and fixedly installed on a heat radiation plate. The first IGBT absorption capacitor is mounted above the first IGBT inversion module in a stacking manner; the second IGBT absorption capacitor is mounted above the second IGBT inversion module in a stacked manner; the inductor is connected in series between the first output end of the rectification module and the first input end of the first IGBT inversion module; and the blocking capacitor is connected in series between the output end of the first IGBT inversion module and one wiring end of the primary side coil of the transformer. Main heating devices in the inverter, namely the rectifier module, the inverter module and the two filter capacitors connected in parallel at the two ends of the inverter module, are fixedly mounted on the heat dissipation plate, so that the heat dissipation effect of the inverter structure in the switching power supply is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-power power switches, in particular to an inverter structure for a switching power supply. Background Art

[0002] Switch Mode Power Supply (SMPS), also known as switching power supply or switching converter, is a high-frequency power conversion device and a type of power supply. Its function is to convert a voltage level into the voltage or current required by the user through different forms of architecture.

[0003] The main circuit of the switching power supply includes input filter, rectification and filtering circuit, inverter circuit and output rectification and filtering circuit. The inverter circuit is realized by switching tubes, such as IGBT switching tubes, which can effectively control the switching and regulation of current and provide stable and reliable power output. However, the higher the switching frequency of the IGBT, the more switching times, the higher the power loss, and after multiplying by the thermal resistance of the heat sink, the higher the temperature rise of the IGBT. If the temperature is high enough to exceed the upper limit of the IGBT, the IGBT will fail.

[0004] Therefore, how to improve the inverter circuit structure in the switching power supply and enhance the heat dissipation effect, thereby ensuring the reliability of the switching power supply, has become a problem that needs to be solved urgently. Utility Model Content

[0005] In view of this, an embodiment of the utility model provides an inverter structure for a switching power supply to solve the problem in the prior art that the heat dissipation performance of the inverter circuit of the switching power supply is not high enough, which may cause the failure of the IGBT switch tube in high-power application scenarios.

[0006] The present invention provides an inverter structure for a switching power supply, comprising:

[0007] The rectifier module, the first filter capacitor, the first IGBT inverter module, the second IGBT inverter module and the second filter capacitor are all directly fixedly mounted on the heat sink;

[0008] A first IGBT absorption capacitor is stacked and installed above the first IGBT inverter module;

[0009] A second IGBT absorption capacitor is stacked and installed above the second IGBT inverter module;

[0010] An inductor connected in series between the first output terminal of the rectifier module and the first input terminal of the first IGBT inverter module;

[0011] The DC blocking capacitor is connected in series between the output end of the first IGBT inverter module and one connection terminal of the primary coil of the transformer.

[0012] Optionally, it also includes:

[0013] A first copper busbar is used to connect the second output end of the rectifier module, the first input end of the first IGBT inverter module, one end of the first filter capacitor, one end of the first IGBT absorption capacitor, the first input end of the second IGBT inverter module, one end of the second filter capacitor, and one end of the second IGBT absorption capacitor;

[0014] A second copper busbar is used to connect the second input end of the first IGBT inverter module, the other end of the first filter capacitor, the other end of the first IGBT absorption capacitor, the second input end of the second IGBT inverter module, the other end of the second filter capacitor and the other end of the second IGBT absorption capacitor;

[0015] The third copper busbar has one end fixed to the first output end of the rectifier module and is used to realize the connection between the rectifier module and the DC blocking capacitor.

[0016] Optionally, it also includes:

[0017] The incoming line terminal is connected to the input end of the rectifier module; the incoming line terminal is a three-phase power input terminal.

[0018] Optionally, the heat sink is a liquid cooling plate; a water inlet and a water outlet are provided on the side of the heat sink.

[0019] Optionally, it also includes:

[0020] A bent copper busbar, one end of which is fixedly connected to the output end of the first IGBT inverter module;

[0021] The copper bar is bent at 90 degrees, and one side of the bent copper bar is fixedly connected to the bent copper bar; the other side of the bent copper bar is fixedly connected to one side of the DC blocking capacitor.

[0022] Optionally, it also includes:

[0023] The fourth copper bar is fixed on the other side of the DC blocking capacitor; the fourth copper bar is connected to one terminal of the primary coil of the transformer; wherein the other terminal of the primary coil of the transformer is connected to the output terminal of the second IGBT inverter module.

[0024] Optionally, it also includes:

[0025] The frame is used to fix the inductor and the DC-isolating capacitor assembly; wherein the DC-isolating capacitor assembly is composed of three DC-isolating capacitors, a 90-degree bent copper bar and a fourth copper bar.

[0026] Beneficial effects of the embodiments of the utility model:

[0027] 1. The embodiment of the utility model provides an inverter structure for a switching power supply, in which the main heat-generating components in the inverter, namely the rectifier module, the inverter module and two filter capacitors connected in parallel at both ends of the inverter module, are fixedly mounted on a heat sink, thereby improving the heat dissipation effect of the inverter structure in the switching power supply.

[0028] 2. The main heat-generating components in the inverter of the switching power supply are attached to the liquid cooling plate to improve the heat dissipation performance and extend the service life of the IGBT switch tube in the switching power supply, thereby ensuring the reliability of the switching power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0030] Figure 1 An overall schematic diagram of an inverter structure for a switching power supply in an embodiment of the utility model is shown;

[0031] Figure 2 A schematic diagram showing a rectifier module and an inverter module of an inverter structure for a switching power supply in an embodiment of the utility model is shown;

[0032] Figure 3 An exploded diagram of a rectifier module and an inverter module of an inverter structure for a switching power supply in an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0034] The embodiment of the utility model provides an inverter structure for a switching power supply, including: a rectifier module 101, a first filter capacitor 102, a first IGBT inverter module 103, a second IGBT inverter module 104, and a second filter capacitor 105, all of which are directly fixedly mounted on a heat sink 200; a first IGBT absorption capacitor 106 is stacked and mounted above the first IGBT inverter module 103; a second IGBT absorption capacitor 107 is stacked and mounted above the second IGBT inverter module 104; an inductor 108 is connected in series between the first output end of the rectifier module 101 and the first input end of the first IGBT inverter module 103; a DC blocking capacitor 109 is connected in series between the output end of the first IGBT inverter module 103 and a connection terminal of a primary coil of a transformer. An incoming line terminal 300 is connected to the input end of the rectifier module 101; the incoming line terminal 300 is a three-phase power input terminal.

[0035] like Figure 1 As shown, the switching power supply is connected to the three-phase voltage through the incoming terminal 300, outputs direct current through the rectifier module 101, and then outputs alternating current through two IGBT inverter modules. Among them, the rectifier module, the inverter module and the two filter capacitors connected in parallel at both ends of the inverter module are the main heating components of the switching power supply inverter. The heating parts of the rectifier module and the inverter module, that is, the bottom of the rectifier module and the inverter module are fixedly installed on the heat sink, and the filter capacitor is also fixed on the heat sink to improve the heat dissipation effect of the inverter structure in the switching power supply.

[0036] In a specific embodiment, the heat sink 200 is a liquid cooling plate; a water inlet 201 and a water outlet 202 are provided on the side of the heat sink 200. The shape of the liquid cooling pipe inside the heat sink 200 is set according to actual needs. The main heat generating components in the inverter of the switching power supply are attached to the liquid cooling plate to improve the heat dissipation performance and extend the service life of the IGBT switch tube in the switching power supply, thereby ensuring the reliability of the switching power supply.

[0037] like Figure 2 and Figure 3 As shown, the first copper bus 110 is used to connect the second output end of the rectifier module 101, the first input end of the first IGBT inverter module 103, one end of the first filter capacitor 102, one end of the first IGBT absorption capacitor 106, the first input end of the second IGBT inverter module 104, one end of the second filter capacitor 105 and one end of the second IGBT absorption capacitor 107.

[0038] The second copper busbar 111 is used to connect the second input end of the first IGBT inverter module 103 , the other end of the first filter capacitor 102 , the other end of the first IGBT absorption capacitor 106 , the second input end of the second IGBT inverter module 104 , the other end of the second filter capacitor 105 and the other end of the second IGBT absorption capacitor 107 .

[0039] One end of the third copper busbar 112 is fixed to the first output end of the rectifier module 101 , and is used to realize the connection between the rectifier module 101 and the DC blocking capacitor 109 .

[0040] The two input ends of the first IGBT inverter module 103, the two pins of the first filter capacitor 102, the first copper bar 110, the second copper bar 111, and the two pins of the first IGBT absorption capacitor 106 are stacked in sequence and fixedly connected by bolts. The two input ends of the second IGBT inverter module 104, the two pins of the second filter capacitor 105, the first copper bar 110, the second copper bar 111, and the two pins of the second IGBT absorption capacitor 107 are stacked in sequence and fixedly connected by bolts.

[0041] like Figure 1 As shown, one end of the bent copper bus 113 is fixedly connected to the output end of the first IGBT inverter module 103 .

[0042] The 90-degree bent copper bar 114 has one side fixedly connected to the bent copper bar 113 ; the other side of the 90-degree bent copper bar 114 is fixedly connected to one side of the DC blocking capacitor 109 .

[0043] The fourth copper bar 115 is fixed on the other side of the DC blocking capacitor 109 ; the fourth copper bar 115 is connected to one terminal of the primary coil of the transformer; wherein the other terminal of the primary coil of the transformer is connected to the output terminal of the second IGBT inverter module 104 .

[0044] The frame 400 is used to fix the inductor 108 and the DC blocking capacitor assembly, wherein the DC blocking capacitor assembly is composed of three DC blocking capacitors 109, a 90-degree bent copper bar 114 and a fourth copper bar 115. The three DC blocking capacitors are in parallel.

[0045] The frame 400 is insulated from the inverter circuit and only serves to fix the inverter circuit structure in the switch power supply box. The fourth copper bar 115 in the DC blocking capacitor assembly is fixed to the frame 400 through two insulating columns. The two connection terminals of the transformer primary coil cable 500 are respectively connected to the output end of the second IGBT inverter module 104 and one end of the fourth copper bar 115.

[0046] The working principle of the inverter circuit structure provided in this embodiment is as follows: three-phase electricity is connected to the circuit through the wiring terminal, direct current is output through the rectifier module, one end is connected to one input end of the two IGBT inverter modules through the inductor, and the other end is directly connected to the other input end of the two IGBT inverter modules, and filter capacitors and absorption capacitors are connected in parallel on both sides of the input ends of the two IGBT inverter modules. Alternating current is output through the IGBT inverter module, the output end of one IGBT inverter module is directly connected to one end of the primary coil of the transformer, the output end of the other IGBT inverter module is connected to the DC blocking capacitor, and the other end of the DC blocking capacitor is connected to the other end of the primary coil of the transformer.

[0047] As described above, the utility model provides an inverter structure for a switching power supply, and the main heat-generating components in the inverter, namely the rectifier module, the inverter module, and the two filter capacitors connected in parallel at both ends of the inverter module, are fixedly mounted on a heat sink, thereby improving the heat dissipation effect of the inverter structure in the switching power supply. At the same time, the main heat-generating components in the inverter of the switching power supply are attached to the liquid cooling plate, thereby improving the heat dissipation performance, extending the service life of the IGBT switch tube in the switching power supply, and thus ensuring the reliability of the switching power supply.

[0048] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An inverter structure for a switching power supply, characterized in that: include: The rectifier module (101), the first filter capacitor (102), the first IGBT inverter module (103), the second IGBT inverter module (104) and the second filter capacitor (105) are all directly fixedly mounted on the heat sink (200); A first IGBT absorption capacitor (106) is stacked and installed above the first IGBT inverter module (103); A second IGBT absorption capacitor (107) is stacked and installed above the second IGBT inverter module (104); an inductor (108) connected in series between a first output end of the rectifier module (101) and a first input end of the first IGBT inverter module (103); The DC blocking capacitor (109) is connected in series between the output end of the first IGBT inverter module (103) and a connection terminal of the primary coil of the transformer.

2. The inverter structure for a switching power supply according to claim 1, characterized in that: Also includes: A first copper busbar (110) is used to connect the second output end of the rectifier module (101), the first input end of the first IGBT inverter module (103), one end of the first filter capacitor (102), one end of the first IGBT absorption capacitor (106), the first input end of the second IGBT inverter module (104), one end of the second filter capacitor (105) and one end of the second IGBT absorption capacitor (107); A second copper busbar (111) is used to connect the second input end of the first IGBT inverter module (103), the other end of the first filter capacitor (102), the other end of the first IGBT absorption capacitor (106), the second input end of the second IGBT inverter module (104), the other end of the second filter capacitor (105) and the other end of the second IGBT absorption capacitor (107); A third copper busbar (112), one end of which is fixed to the first output end of the rectifier module (101), is used to realize the connection between the rectifier module (101) and the DC blocking capacitor (109).

3. The inverter structure for a switching power supply according to claim 1, characterized in that: Also includes: The incoming line terminal (300) is connected to the input end of the rectifier module (101); the incoming line terminal (300) is a three-phase electrical input terminal.

4. The inverter structure for a switching power supply according to claim 1, characterized in that: The heat sink (200) is a liquid cooling plate; a water inlet (201) and a water outlet (202) are provided on the side of the heat sink (200).

5. The inverter structure for a switching power supply according to claim 1, characterized in that: Also includes: A bent copper busbar (113), one end of which is fixedly connected to the output end of the first IGBT inverter module (103); A 90-degree bent copper bar (114) has one bent side fixedly connected to the bent copper bar (113); and the other bent side of the 90-degree bent copper bar (114) is fixedly connected to one side of the DC blocking capacitor (109).

6. The inverter structure for a switching power supply according to claim 5, characterized in that: Also includes: A fourth copper bar (115) is fixed on the other side of the DC blocking capacitor (109); the fourth copper bar (115) is connected to one terminal of the primary coil of the transformer; wherein the other terminal of the primary coil of the transformer is connected to the output terminal of the second IGBT inverter module (104).

7. The inverter structure for a switching power supply according to claim 6, characterized in that: Also includes: The frame (400) is used to fix the inductor (108) and the DC blocking capacitor assembly; wherein the DC blocking capacitor assembly is composed of three DC blocking capacitors (109), the 90-degree bent copper busbar (114) and the fourth copper busbar (115).

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