CN216357914U

CN216357914U - Power module structure and welding machine

Info

Publication number: CN216357914U
Application number: CN202122518973.2U
Authority: CN
Inventors: 王科海; 蒋成将
Original assignee: Shenzhen Jasic Technology Co ltd
Current assignee: Shenzhen Jasic Technology Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-04-19
Anticipated expiration: 2031-10-19

Abstract

The application provides a power module structure and a welding machine, the power module structure comprises an air duct component, a fan component, a power component and a radiator component, the fan component is arranged in an air duct cavity of the air duct component, the air duct component divides the air duct cavity into a first air duct and a second air duct through an air deflector, the air quantity of the first air duct is smaller than that of the second air duct, the first power component with low heat productivity is arranged in the first air duct, arranging a second power component with high heat productivity in a second air duct, arranging a main transformer with maximum heat productivity and large volume in a combined air duct formed by a first air duct and a second air duct, matching the air ducts with different air volumes with the power components with different heat productivity, and then matching with a radiator component for heat dissipation, the heat dissipation of each power component is balanced through a reasonable air duct structure, the heat dissipation effect is improved, and the reliability of the welding machine is improved.

Description

Power module structure and welding machine

Technical Field

The application belongs to the technical field of inverter welding machines, and more specifically relates to a power module structure and a welding machine.

Background

The inverter welding machine is used for rectifying and filtering three-phase or single-phase 50Hz power frequency alternating current to obtain smoother direct current, an inverter circuit consisting of Insulated Gate Bipolar Transistors (IGBTs) or field effect tubes is used for converting the direct current into alternating current of 15-100 kHz, the alternating current is reduced by an intermediate frequency main transformer, and the alternating current is rectified and filtered again to obtain stable direct current output welding current (or is inverted again to output the alternating current with required frequency). The inverter welding machine has been widely used in various welding and cutting processes due to its small size, high integration level, portability, and good stability of output voltage and current. The inverter welding machine integrates a plurality of electronic components, belongs to high-power electronic products, and faces the problem of how to effectively dissipate heat of the plurality of internal electronic components when the inverter welding machine is developed towards miniaturization and intensification. Most of heat dissipation systems of existing inverter welding machines adopt air-cooled heat dissipation, welding machine power components are installed on a radiator, when the welding machine works, the power components generate heat to transmit the heat to the radiator, and then a fan is adopted to conduct forced air-cooled heat dissipation on the radiator and a power device, so that the temperature rise of the welding machine power components is reduced. However, the existing heat dissipation system has the problem of unbalanced heat dissipation of the power assembly due to unreasonable air duct structural layout, so that the reliability of the welding machine is reduced.

Disclosure of Invention

An object of the embodiment of the application is to provide a power module structure and a welding machine, so as to solve the technical problems that the heat dissipation of a power component is unbalanced and the reliability of the welding machine is low due to the unreasonable structure of a heat dissipation air duct inside the welding machine in the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a power module structure including:

the air duct assembly is provided with an air duct cavity, and an air inlet and an air outlet which are communicated with the air duct cavity, and the air duct assembly comprises an air deflector arranged in the air duct cavity, and the air deflector divides the air duct cavity into a first air duct and a second air duct; the cross sectional area of the air inlet end of the first air channel is smaller than that of the air inlet end of the second air channel; the first air duct and the second air duct are combined to form a combined air duct at a position close to the air outlet;

the fan assembly is arranged in the air duct cavity;

the power assembly comprises a main transformer arranged on the combined air channel, a first power assembly arranged in the first air channel and a second power assembly arranged in the second air channel, and the calorific value of the first power assembly is lower than that of the second power assembly;

and the heat radiator assembly is arranged in the second air duct and is in thermal contact with the second power assembly.

Optionally, the number of the air deflectors is two, and the two air deflectors are arranged at intervals and form the first air duct between the two air deflectors;

the number of the second air channels is two, the two second air channels are respectively arranged on two sides of the first air channel, and the cross sectional areas of the air inlet ends of the two second air channels are the same.

Optionally, the first power component comprises a power factor correction circuit inductor and an input filter capacitor; the second power component comprises a power factor correction circuit insulated gate bipolar transistor, a power factor correction circuit diode, a primary inversion insulated gate bipolar transistor, an input rectifier bridge and a secondary output rectifier bridge.

Optionally, one end of each of the two air deflectors, which is close to the air inlet, is provided with a bent portion, and a splayed air guiding opening is formed between the two bent portions.

Optionally, the longitudinal height of the fan assembly is higher than the longitudinal height of the main transformer.

Optionally, the fan subassembly is located air intake department, the wind channel subassembly is being close to air intake department has the inclined plane, the inclined plane be used for with the wind that the fan subassembly produced is leading-in to the wind channel intracavity.

Optionally, the radial width of the fan assembly matches the lateral width of the air inlet.

Optionally, the air duct assembly further includes a circuit board and a top cover mounted on the circuit board, and the top cover and the circuit board enclose to form the air duct cavity.

Optionally, the air deflector and the top cover are of an integrally formed structure.

Optionally, the present application provides a welding machine having the above-described power module structure.

The application provides a power module structure's beneficial effect lies in: compared with the prior art, the power module structure comprises an air duct assembly, a fan assembly, a power assembly and a radiator assembly, wherein the air duct assembly is provided with an air duct cavity for cold air to flow through, the fan assembly is arranged in the air duct cavity, the air duct assembly comprises an air deflector arranged in the air duct cavity, and the air duct cavity is divided into a first air duct and a second air duct by the air deflector; the air quantity in the first air channel is smaller than that in the second air channel; the first air duct and the second air duct are combined to form a combined air duct at a position close to the air outlet; according to the heating characteristic of the existing power assembly, the first power assembly with lower heating value is installed in the first air channel, the second power assembly with high heating value is installed in the second air channel, the main transformer with the largest heating value and large volume is installed in the combined air channel, the air channels with different air volumes are matched with the power assemblies with different heating values, and then the heat dissipation is carried out by matching with the radiator assembly arranged in the second air channel.

The beneficial effect of the welding machine that this application provided is unanimous with the beneficial effect of the power module structure of this application, no longer gives unnecessary details here.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic top view of a power module structure according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the air path of FIG. 1;

FIG. 3 is a schematic diagram of a top cover according to an embodiment;

FIG. 4 is a schematic perspective view of a power module according to an embodiment;

fig. 5 is a schematic layout structure of a power device according to an embodiment.

Wherein, in the figures, the respective reference numerals:

1. a fan assembly; 2. an air duct assembly; 21. an air deflector; 211. a bending section; 22. an inclined surface; 23. an air inlet; 24. an air outlet; 25. a circuit board; 26. a top cover; 27. combining the air channels; 271. a first air duct; 272. a second air duct; 273. an air inlet end; 3. a power component; 31. a first power component; 311. inputting a filter capacitor; 312. a power factor correction circuit inductance; 32. a second power component; 321. an input rectifier bridge; 322. the power factor correction circuit is an insulated gate bipolar transistor; 323. a power factor correction circuit diode; 324. a primary inversion insulated gate bipolar transistor; 325. a secondary output rectifier bridge; 33. a main transformer; 4. a heat sink assembly.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "middle," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and fig. 2 together, a power module structure according to an embodiment of the present disclosure will be described. The power module structure comprises an air duct assembly 2, a fan assembly 1, a power assembly 3 and a radiator assembly 4.

The air duct assembly 2 is provided with an air duct cavity, and an air inlet 23 and an air outlet 24 which are communicated with the air duct cavity, the air duct assembly 2 comprises an air deflector 21 arranged in the air duct cavity, and the air deflector 21 divides the air duct cavity into a first air duct 271 and a second air duct 272; the cross-sectional area of the air inlet end 273 of the first air duct 271 is smaller than that of the air inlet end 273 of the second air duct 272; the first air duct 271 and the second air duct 272 are combined to form a combined air duct 27 near the air outlet 24; and the fan assembly 1 is arranged in the air duct cavity.

Specifically, two ends of the air duct cavity are communicated for the circulation of cold air, one end of the air duct cavity is provided with an air inlet 23, and the other end opposite to the air inlet 23 is provided with an air outlet 24. The fan assembly 1 is arranged in the air duct cavity, and preferably, the fan assembly 1 is arranged at an air inlet 23 of the air duct cavity and dissipates heat in an air blowing mode; certainly, the fan assembly 1 can also be arranged at the air outlet 24 of the air duct cavity to dissipate heat in an air draft mode; in other embodiments, the fan assembly 1 may also be disposed at the middle position of the air duct cavity as required. The fan assembly 1 is preferably a single fan; in other embodiments, multiple fans can be installed as needed to prevent a single fan failure from affecting the operation of the entire welder.

Specifically, in the air duct cavity, the air deflector 21 in the air duct assembly 2 divides the inner area of the air duct cavity into a first air duct 271 and a second air duct 272, and preferably, the first air duct 271 and the second air duct 272 are arranged in parallel and are parallel to each other; the first air duct 271 and the second air duct 272 share the air inlet 23 and the air outlet 24, the air inlet volume of the first air duct 271 is different from that of the second air duct 272, and the air inlet volume of the second air duct 272 is greater than that of the first air duct 271.

Specifically, one end of the air deflector 21 close to the air outlet 24 extends to the rear end of the air duct cavity, and the first air duct 271 and the second air duct 272, which are originally separated by the air deflector 21, are combined at the rear end of the air duct cavity to form an integral air duct, i.e., the combined air duct 27.

Specifically, the power module 3 includes a main transformer 33 disposed on the merging air duct 27, a first power module 31 disposed in the first air duct 271, and a second power module 32 disposed in the second air duct 272, and the heat generation amount of the first power module 31 is lower than that of the second power module 32.

Specifically, the main transformer 33 generally generates the most heat and is bulky according to the heat generation characteristics of the conventional power module 3, and therefore, is installed in the combined air duct 27 at an extended position corresponding to the first air duct 271. Thus, a part of the air blown from the second air duct 272 can dissipate heat of the main transformer 33, most of the air continues to dissipate heat of each power component arranged in the second air duct 272, and all the air in the first air duct 271 dissipates heat of the main transformer 33; the combined air duct 27 structure leaves enough installation space for the main transformer 33, and on the other hand, achieves good heat dissipation effect of the main transformer 33 by comprehensively utilizing the air volume in the first air duct 271 and the second air duct 272. The first power module 31 with lower heating value is arranged in the first air channel 271, the second power module 32 with higher heating value is arranged in the second air channel 272, and the air channels with different air volumes are matched with the power modules 3 with different heating values to improve the heat dissipation efficiency.

Specifically, the heat sink assembly 4 is disposed within the second air duct 272 and in thermal contact with the second power assembly 32.

Specifically, the heat sink assembly 4 may include a plurality of heat sinks, and the corresponding heat sinks may be respectively configured according to the heat dissipation characteristics of the respective power assemblies 3. The radiator can be a common plate-type finned radiator, and the fin gap of the radiator is utilized to be combined with the fan assembly 1 for heat radiation. For example, referring to fig. 5, in the present embodiment, a plurality of heat sinks are disposed corresponding to a plurality of power modules 3, and the bottom of each heat sink is fixedly mounted on the bottom plate surface, so that the heat of the corresponding power module 3 in thermal contact therewith is dissipated into the corresponding air duct through the fin gap thereof.

Preferably, there is a gap between the heat sink assembly 4 and the air deflection plate 21. The radiator uses the fin gap as a radiating air duct to radiate, and in order to discharge wind energy in the fin gap smoothly, a gap is provided between the air deflector 21 and each radiator, and optionally, the size of the gap is set to be about 2 mm. The radiator can normally radiate heat, and simultaneously, the internal space of the welding machine is reasonably and compactly utilized.

The power module structure comprises an air duct component 2, a fan component 1, a power component 3 and a radiator component 4, wherein the air duct component 2 is provided with an air duct cavity for cold air circulation, the fan component 1 is arranged in the air duct cavity, the air duct component 2 comprises an air deflector 21 arranged in the air duct cavity, and the air duct cavity is divided into a first air duct 271 and a second air duct 272 by the air deflector 21; and the air volume in the first air duct 271 is smaller than the air volume in the second air duct 272; the first air duct 271 and the second air duct 272 are combined to form a combined air duct 27 near the air outlet 24; according to the heating characteristic of the existing power component 3, the first power component 31 with lower heating value is installed in the first air channel 271, the second power component 32 with higher heating value is installed in the second air channel 272, the main transformer 33 with the largest heating value and large volume is installed in the combined air channel 27, the air channels with different air volumes are matched with the power components 3 with different heating values, and then the heat dissipation is carried out by matching with the radiator component 4 arranged in the second air channel 272, the heat dissipation of each power component 3 is balanced through reasonable air channel structural design, the heat dissipation effect of the whole power module structure is improved, and further the reliability of the power module structure is improved.

In another embodiment of the present application, please refer to fig. 1, the number of the air deflectors 21 is two, two air deflectors 21 are arranged at an interval, and a first air channel 271 is formed between the two air deflectors 21; the number of the second air channels 272 is two, the two second air channels 272 are respectively disposed at two sides of the first air channel 271, and the cross-sectional areas of the air inlet ends 273 of the two second air channels 272 are the same.

Specifically, in the present embodiment, the two air deflectors 21 are disposed opposite to each other and spaced apart from each other, and the inner portion of the air duct cavity is divided into three air ducts, that is, a first air duct 271 located between the two air deflectors 21, and two second air ducts 272 located at two sides of the first air duct 271. The air intake of the first air duct 271 is smaller than the air intake of the second air ducts 272 on both sides. The structure of three wind channels will be more favorable to each power component 3's evenly distributed, makes its heat dissipation more balanced.

In another embodiment of the present application, referring to fig. 5, the first power component 31 includes a pfc circuit inductor 312, i.e., a pfc (power Factor correction) circuit inductor, and an input filter capacitor 311; the second power component 32 includes a power factor correction circuit insulated gate bipolar transistor 322 (i.e., PFC circuit IGBT), a power factor correction circuit diode 323 (i.e., PFC diode), a primary inverter insulated gate bipolar transistor 324 (i.e., primary inverter IGBT), an input rectifier bridge 321, and a secondary output rectifier bridge 325.

Specifically, in this embodiment, it is found through the loss calculation and the thermal simulation experiment performed on the power components 3 that, in each power component 3 of the welding machine, the loss of the PFC circuit inductance and the input filter capacitance is small, the heat generation is small, and the volume is small, and the loss and the heat generation of the main transformer 33 are maximum and the volume is large. Therefore, when the power module 3 is installed in a layout manner, the three air duct heat dissipation structures arranged in parallel are adopted, the inductor and the input filter capacitor of the PFC circuit are placed in the area where the first air duct 271 with the smaller air volume is located, and the IGBT, the PFC diode, the primary inverter IGBT, the input rectifier bridge and the secondary output rectifier bridge of the PFC circuit are uniformly arranged in the area where the second air duct 272 with the larger air volume is located. The heat dissipation of each power component 3 is balanced by matching the air channels with different air volumes with the power components 3 with different heat productivity.

Specifically, referring to fig. 5, in the present embodiment, a PFC circuit IGBT, a PFC diode, a primary inverter IGBT and a secondary output rectifier bridge are disposed in one of the two second air channels 272; the input rectifier bridge 321, the primary inverter IGBT, and the secondary output rectifier bridge are disposed in the other of the two second air ducts 272. The power devices in the second power assembly 32 are uniformly arranged in the two second air channels 272, i.e. uniformly arranged on both sides of the first air channel 271, according to the actual layout requirement. The above air duct structure makes the layout structure of the first power assembly 31 and the second power assembly 32 compact, and improves the overall space utilization rate of the power module structure.

In another embodiment of the present application, referring to fig. 1, one end of the two air guiding plates 21 close to the air inlet 23 has a bending portion 211, and a splayed air guiding opening is formed between the two bending portions 211.

Specifically, the two bent portions 211 form an air guiding opening, preferably, the two bent portions 211 with an inclined angle form the air guiding opening at a position close to the air inlet 23 of the first air duct 271 on one side of the fan assembly 1, and the air volume of the cold air blown by the fan assembly 1 is diverted to the second air duct 272 under the guiding action of the air guiding opening, specifically, the air volume of the first air duct 271 is forced to be diverted to the second air ducts 272 on both sides thereof, so that the air volume of the first air duct 271 is smaller than the air volume in the second air ducts 272 on both sides thereof.

Specifically, the air guiding openings are arranged in a splayed shape, and the narrow opening ends of the splayed air guiding openings are arranged close to the fan assembly 1, so that cold air blown from the fan assembly 1 is divided under the flow guiding effect of the splayed air guiding openings, that is, the air volume of the first air channel 271 is forcibly divided towards the two second air channels 272 at the two sides, so that the air volume in the second air channels 272 at the two sides of the first air channel 271 is more than that in the first air channel 271. For example, in one embodiment, the splayed air guiding opening divides the air volume of the first air duct 271 into about 2/5 air volumes of the two air ducts, and the air volume of the first air duct 271 is only about 1/5 air volume. Therefore, the heating characteristics of the power components 3 are combined, and the power components are distributed in three air channels with different air quantities, so that the air quantities are reasonably and effectively utilized, and the heat dissipation efficiency and the heat dissipation balance are improved.

In another embodiment of the present application, the bending portion 211 is rotatably connected to the air guiding plate 21. Specifically, the two bent portions 211 together form a splayed air guiding opening for distributing cold air, that is, the cold air blown by the fan assembly 1 is reasonably distributed into the first air channel 271 and the two second air channels 272 on both sides thereof. In the actual working process of the power module, the two bending parts 211 can be rotated according to the heat dissipation condition of each power component 3, so that the opening size of the splayed air guide opening can be adjusted, the air volume in the three air channels can be adjusted, the total air volume is reasonably distributed, and the balanced heat dissipation of each power component 3 is achieved. Certainly, in another embodiment, after the loss calculation and the thermal simulation experiment, the loss and the heat generation condition of each power module 3 are obtained more accurately, and both the two bent portions 211 are respectively and fixedly connected to the two air deflectors 21 to divide the cold air at a fixed inclination angle, at this time, the bent portions 211 may be a part inherent to the air deflectors 21, that is, integrally formed, or may be detachably connected.

In another embodiment of the present application, referring to fig. 4, the longitudinal height of the fan assembly 1 is higher than the longitudinal height of the main transformer 33.

Specifically, each power module 3 is mounted on the PCB by using the mounting surface of the PCB of the power module as a reference surface, and in order to sufficiently dissipate heat of each power module 3, the longitudinal height of the fan assembly 1 generally needs to be higher than the longitudinal height of each power module 3 in the air duct. In general, the height of the fan assembly 1 is selected as a reference of the main transformer 33 with a large volume and the highest height in the power assembly 3, and the fan assembly 1 is disposed higher than the main transformer 33.

In another embodiment of the present application, referring to fig. 4, the fan assembly 1 is disposed at the air inlet 23, and the air duct assembly 2 has an inclined surface 22 near the air inlet 23, where the inclined surface 22 is used for guiding the air generated by the fan assembly 1 into the air duct cavity.

Specifically, in the present embodiment, since the fan assembly 1 is disposed higher than the main transformer 33, a gap with a height difference is formed between the fan assembly 1 and the air duct cavity, and a portion of air volume generated by the fan assembly 1 is blown away from the top gap, which cannot form a good heat dissipation effect. For preventing that cold wind from blowing away from the space, air duct component 2 has inclined plane 22 near air intake 23 department, and inclined plane 22 and fan component 1 joint with the space shutoff between fan component 1 and the wind channel chamber to form comparatively inclosed wind channel structure, with the whole leading-in to the wind channel intracavity of wind that fan component 1 produced, reduced the loss of the amount of wind, improved the radiating efficiency. Alternatively, to match the profile of a conventional fan, the angled surface 22 is flared to the fan assembly 1 to form a complete interface with the profile of the fan.

In another embodiment of the present application, referring to FIG. 4, the radial width of the fan assembly 1 matches the lateral width of the intake vent 23.

Specifically, when the fan assembly 1 is selected, the radial width (transverse width) of the fan assembly 1 matches the transverse width of the air inlet 23, that is, the cool air of the fan assembly 1 can be completely blown into the air duct structure. Therefore, the air quantity of the fan assembly 1 can be utilized to the maximum extent, the air quantity utilization rate of the fan assembly 1 is improved, and each power assembly 3 can be well cooled.

In another embodiment of the present application, referring to fig. 3, the air duct assembly 2 further includes a circuit board 25 and a top cover 26 mounted on the circuit board 25, the top cover 26 and the circuit board 25 enclosing to form an air duct chamber.

Specifically, in the present embodiment, the air duct chamber is enclosed by the top cover 26 and the circuit board 25. The inner area of the top cover 26 is divided into a first air duct 271 area and two second air ducts 272 area by the two air deflectors 21. Compare and to have power module 3 to arrange the scheme outside circuit board 25 among the prior art, each power module 3 of this embodiment all installs on circuit board 25, circuit board 25 top is located to the whole cover of overhead guard 26, each power module 3 on the circuit board 25 all is located inside overhead guard 26, dispel the heat to each power module 3 through the inside wind channel structure of overhead guard 26, the power module structural layout who forms from this is compact, the space utilization of circuit board 25 has been improved, the power module 3 outside extra electric connection cable connection circuit board 25 has been avoided increasing. Meanwhile, the top cover 26 may also protect each power module 3 located therein.

In another embodiment of the present application, referring to fig. 3, the air deflector 21 and the top cover 26 are integrally formed.

Specifically, in this embodiment, the air deflector 21 and the top cover 26 can be integrally formed through stamping, injection molding or other methods, and the integrally formed structure reduces the installation connection between the air deflector 21 and the top cover 26, so that the installation is convenient and fast, the mass production is facilitated, and the stability of the air duct structure is enhanced through the integrally formed structure.

In another embodiment of the present application, the air duct cavity may also be enclosed by a casing and a lower bottom plate of the power module, that is, the air duct assembly 2 is not an integrally formed air guiding cover, but two air guiding plates 21 are respectively connected to the casing, specifically to a top wall of the casing, and optionally, if the air duct assembly 2 is a metal piece, the air duct assembly may be connected by welding; if the air duct component 2 is a plastic part, the air duct component can be connected by bonding and other methods. Thereby dividing the air channel chamber enclosed by the housing and the bottom plate into a corresponding first air channel 271 and two second air channels 272. In this embodiment, the aviation baffle 21 can match the setting according to the size of casing etc. to the power module structure of different grade type unidimensional, can design the wind channel structure according to this scheme, and the commonality is strong, and reforms transform simple and conveniently.

Now, the welding machine with the above power module structure provided by the present application is explained:

the welding machine heat dissipation theory of operation that this application has as above power module structure does: referring to fig. 1 to 5, the cold air entering the fan assembly 1 completely enters the air duct cavity under the action of the bell-mouth-shaped inclined surface 22, and then is distributed to the first air duct 271 and the two second air ducts 272 on both sides thereof under the shunting action of the splayed air guiding opening formed by the two bending portions 211, and the air intake of the first air duct 271 is smaller than the air intake of the second air ducts 272 on both sides. For example, the splayed air guiding opening forces the air volume of the first air duct 271 to be divided into 2/5 air volumes respectively at the left and right sides of the air duct, and the air volume of the first air duct 271 is only left at about 1/5, so that the air volume of the second air ducts 272 at the two sides is increased, and the heat dissipation effect of the IGBT is improved. Because the main transformer 33 generates the largest heat and has a large volume, the three separated air ducts are merged at the position close to the main transformer 33 at the rear end of the first air duct 271 to form the merged air duct 27, so that a part of the air volume in the second air ducts 272 at the two sides of the first air duct 271 can dissipate heat for the main transformer 33, and most of the air volume continues to dissipate heat for the secondary output rectifier bridge 325. For the main transformer 33, the whole air volume of the first air duct 271 and part of the air volume from the two second air ducts 272 at the two sides of the first air duct 271 dissipate heat, so that the heat dissipation effect is improved. The power module structure of the application is detected, the temperature rise of each power device is within a standard range, the temperature difference of similar devices (such as IGBT and diode) is not more than 15 ℃, the heat dissipation of the power devices is balanced, and the reliability of the welding machine is improved to a great extent.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A power module structure, comprising:

the fan assembly is arranged in the air duct cavity;

2. The power module structure of claim 1, wherein: the number of the air deflectors is two, the two air deflectors are arranged at intervals, and the first air channel is formed between the two air deflectors;

3. The power module structure of claim 2, wherein: the first power component comprises a power factor correction circuit inductor and an input filter capacitor; the second power component comprises a power factor correction circuit insulated gate bipolar transistor, a power factor correction circuit diode, a primary inversion insulated gate bipolar transistor, an input rectifier bridge and a secondary output rectifier bridge.

4. The power module structure of claim 3, wherein: one end of each of the two air guide plates, which is close to the air inlet, is provided with a bent part, and a splayed air guide opening is formed between the two bent parts.

5. The power module structure of claim 1, wherein: the longitudinal height of the fan assembly is higher than that of the main transformer.

6. The power module structure of claim 5, wherein: the fan subassembly is located air intake department, the wind channel subassembly is being close to air intake department has the inclined plane, the inclined plane be used for with the wind that the fan subassembly produced is leading-in to the wind channel intracavity.

7. The power module structure of any of claims 1 to 6, wherein: the radial width of the fan assembly is matched with the transverse width of the air inlet.

8. The power module structure of any of claims 1 to 6, wherein: the air duct assembly further comprises a circuit board and a top cover mounted on the circuit board, and the top cover and the circuit board are enclosed to form the air duct cavity.

9. The power module structure of claim 8, wherein: the air deflector and the top cover are of an integrally formed structure.

10. A welding machine, characterized by: having a power module structure according to any one of claims 1 to 9.