High-power AC-DC converter

Abstract

The invention relates to a high-power AC-DC converter, which is characterized in that a main body framework adopts an aluminum alloy main body framework structure with an upper layer plate and a lower layer plate, the middle part of the main body framework is two circular hollow bodies which are not connected with each other, one ends of the two circular hollow bodies are respectively communicated through a U-shaped pipe, and the other ends of the two circular hollow bodies are respectively communicated with the U-shaped pipe. The other ends of the circular hollow bodies are also communicated through a U-shaped pipe, a pressurizing pipeline pump is installed in the center of the U-shaped pipe, and cooling liquid in the upper circular cavity and the lower circular cavity circulates through the push-pull effect of the pump; a hollow groove is further formed in the middle of the main body framework so as to distinguish a high-voltage side and a low-voltage side and eliminate the influence of distributed capacitors on the two sides, the high-voltage side supports AC 380V voltage input, and the low-voltage side supports as many as four paths of 100A direct current output. Therefore, the AC-DC conversion device has universal demonstration significance, and can be used as a core standard configuration of electric vehicle charging equipment after being slightly improved.

Description

Technical Field

[0001] The invention relates to a high-power AC-DC converter, which is characterized in that a main frame adopts an I-shaped aluminum profile heat dissipation structure with ribs, and is divided into an AC high-voltage input side and a DC output low-voltage side, wherein the high-voltage side supports an AC380V voltage input, and the low-voltage side also supports up to four 100A DC outputs; the middle part is two circular hollow bodies that are not connected to each other, one end of the two circular hollow bodies is respectively connected by a U-shaped tube, and the other end of the circular hollow bodies is also connected by a U-shaped tube, and ethylene glycol antifreeze coolant is filled therein, and a booster pipeline pump is installed in the central part of the U-shaped tube, and the coolant in the upper and lower circular cavities is circulated by the push-pull action of the pump; a hollow groove is also opened in the middle of the main frame to distinguish the high-voltage side from the low-voltage side and eliminate the influence of the distributed capacitance on both sides, therefore, this highly operational AC-DC conversion device has universal demonstration significance, and with a little improvement, it is the core standard configuration of an electric vehicle charging pile. Background Art

[0002] The high-power AC-DC converter is an AC-DC converter that works under high voltage and high current conditions. According to user requirements, the device is connected with AC380V input and four DC outputs greater than 100A. Therefore, this working area has both alternating current and direct current; both high-voltage side and low-voltage side; both high-frequency circuits and low-frequency circuits; both high voltage and high current. The mixture of fish and shrimp will inevitably lead to many unexpected mixed cross-harmonic interferences. Therefore, the biggest difficulty in designing this high-power AC-DC converter is not how to implement the circuit, because the circuit of the AC-DC converter is already quite mature. The biggest difficulty in the design scheme is still the design of the three-dimensional topological space, that is, how to take a multi-pronged and comprehensive approach to achieve the heat dissipation of high-power devices as quickly as possible in an effective space, and at the same time solve the inexplicable electrostatic induction and leakage problems, especially when starting a high-power inductive load, its surge current will cause voltage distortion, which is bound to greatly reduce the power factor of the AC-DC converter and cause the zero point deviation of the AC midpoint voltage, causing harm to personal safety or other electrical equipment.

[0003] Obviously, a high-power AC-DC converter is designed to solve the heat dissipation, electrostatic induction and leakage problems under high current conditions. Based on this, the present invention proposes a set of overall most economical and optimal system design solutions in accordance with the theory of system engineering. Its main frame adopts an I-shaped aluminum profile heat dissipation structure with ribs. For this purpose, the upper and lower ends of the I-shaped aluminum profile are provided with installation grooves for inserting PCB boards, and the outermost side is provided with a circular groove with a rectangular opening to respectively insert and install the aluminum alloy side panels with heat dissipation ribs; the middle part of the aluminum profile is two unconnected circular hollow bodies, one end of the two circular hollow bodies are connected by a U-shaped tube, and a booster pipeline pump is installed in the central part of the U-shaped tube at the other end of the circular hollow body. Through the push-pull action of the booster pipeline pumping, the two circular cavities are The coolant in the body begins to circulate to achieve the purpose of heat dissipation. In order to prevent the coolant from volatilizing, a coolant replenishment injection hole is opened on the top of the main frame aluminum profile; the high-voltage side of the main frame supports AC380V voltage input. In order to offset the surge impact from the power grid, a three-phase horizontal inductor with an amorphous alloy iron core is installed on the high-voltage side of the main frame, and 16 VMOS power tubes are closely installed on the low-voltage side of the main frame to support up to four DC outputs; an AC380V AC input socket and a five-core DC output socket are installed on the front panel of the AC-DC converter, and a four-core CAN FD local bus socket and an equipotential wiring screw are installed on the rear panel of the C-DC converter. The equipotential wiring screw is directly connected to the main frame, thereby ensuring that the AC-DC converter is only a node of the CAN local bus and can communicate with the host computer through the network.

[0004] In order to ensure its reliable operation and completely eliminate the influence of the distributed parasitic capacitance on the high-voltage side and the low-voltage side of the high-power AC-DC converter, the floating potential generated by the joint action of electromagnetic induction, and the obvious skin effect caused by the frequent on-off of the high-voltage switch components, the central part of the main skeleton of the AC-DC converter is also provided with a rectangular air slot with a safe interval to effectively cut off the parasitic loop that may be generated by the distributed capacitance and the skin effect; in order to ensure the multi-point grounding problem of the high-power AC-DC converter, eliminate the cross interference caused by the offset of the adjacent potential and the circulation formed by the bad closed loop, the high-power AC-DC converter also adopts an equipotential grounding technology, that is, multiple equipotential bodies are connected to each other and then uniformly grounded at a single point in the form of copper bars nearby. This low-impedance grounding scheme that can be connected in parallel, because the potential of each point on the equipotential plane is the same and there is no potential difference, so when the charge is moved along the equipotential surface, the electric field force does not do work, thereby ensuring that the current will not flow between these equipotentials, thereby greatly reducing the high-frequency reflection and standing wave interference caused by the multi-point ground line impedance and the skin effect, and completely eliminating the phenomenon of induced static electricity or leakage.

[0005] Obviously, if this high-power AC-DC converter is directly used in the charging pile service station of the community CAN FD local bus, with the support of the DeepSeek large model, it will be a standard configuration for electric vehicle charging piles to achieve embodied intelligence. Summary of the invention

[0006] In view of this, the present invention introduces a high-power AC-DC converter, the specific contents of which are as follows: A high-power AC-DC converter, comprising a front panel, a left panel, a right panel, a rear panel, an upper panel, a lower panel, a three-phase horizontal reactor, a DC output side PCB circuit board, an aluminum alloy main frame, and a booster pipeline pump. The main points are: The aluminum alloy main frame is the core component of the high-power AC-DC converter, and is made of aluminum material. The upper plate and the lower plate form an I-shaped main frame, and the upper plate has its own upper plate heat dissipation ribs, and the lower plate has its own lower plate heat dissipation ribs. An upper circular hollow body and a lower circular hollow body are opened on the intermediate body connecting the upper plate and the lower plate, and a rectangular hollow groove is opened between the two circular hollow bodies, but the rectangular hollow groove is not connected to the upper circular hollow body and the lower circular hollow body. It only uses the structural characteristics of the intermediate body of the main frame to divide a high-power AC-DC converter into two major parts, an AC high-voltage input side and a DC low-voltage output side, to overcome the influence of distributed capacitance, wherein the AC high-voltage input side is close to the left plate, and the DC low-voltage output side is close to the right plate; One end of the upper circular hollow body and the lower circular hollow body is connected to a U-shaped connecting pipe, and the other end is connected to a booster pipeline pump. The booster pipeline pump is connected to a booster pipeline pump connecting pipe A and a booster pipeline pump connecting pipe B on both sides. The other ends of the booster pipeline pump connecting pipe A and the booster pipeline pump connecting pipe B are connected to the circular hollow body and the lower circular hollow body to form a cavity; The upper circular hollow body and the lower circular hollow body are respectively loaded with coolant. Under the push of the booster pipeline pump, the coolant starts from the upper circular hollow body, passes through the U-shaped connecting pipe and returns to the lower circular hollow body, completing the circulation of the coolant, thereby forming a flowing coolant loop that runs through the cavity from top to bottom. In order to replenish the coolant, a coolant injection hole is opened at the central position of the upper plate of the aluminum alloy main frame, and the coolant injection hole is connected to the upper circular hollow body. After the coolant is injected, the coolant injection hole can be sealed with a screw sealing plug of the injection hole; The upper and lower plates constituting the aluminum alloy main frame are provided with circular grooves with rectangular openings to facilitate the insertion of the left and right plates. The left plate is provided with left plate heat dissipation ribs, and the right plate (3) is provided with right plate heat dissipation ribs. The upper and lower plates of the aluminum alloy main frame are provided with PCB installation grooves. In the example, the PCB is inserted into the main frame. Optocouplers, resistors, freewheeling diodes, electrolytic capacitors and VMOS tubes are welded on the DC low-voltage output side PCB. VMOS tube heat dissipation fixing holes are drilled on the middle body of the main frame to ensure that the heat dissipation surface of the VMOS tube can be closely attached to the middle body of the main frame. The pins are welded on the PCB. The upper and lower plates constituting the aluminum alloy main frame are also provided with panel fixing holes, and screws are passed through the front panel mounting holes of the front panel and the rear panel mounting holes of the rear panel and then connected with the panel fixing holes on the main frame; The front panel is equipped with a three-core AC380V three-core input socket and a DC five-core output socket; A four-core CAN FD socket and an equipotential terminal are installed on the rear panel. For reliability, the screws of the equipotential terminal are directly connected to the aluminum alloy main frame.

[0007] Furthermore, the main frame is formed by one-time stretching of aluminum alloy material and is post-treated by metal anodizing, but both ends are wire-cut and shaped.

[0008] Furthermore, the front panel is provided with front panel ribs, and the rear panel is provided with rear panel ribs.

[0009] Furthermore, a three-phase horizontal reactor is installed on the AC high-voltage input side. This is a three-phase reactor with a copper busbar wrapped around an amorphous alloy core body. The reactor is directly installed on the main frame through a horizontal bracket. Since the three-phase horizontal reactor uses a new type of amorphous alloy material as the core, compared with cold-rolled silicon steel sheets, the iron loss is extremely small and the volume is greatly reduced, which can effectively resist the surge current impact from the AC power grid. Furthermore, traditional three-phase reactors are all bulky vertical structures, but in the present invention, the three-phase reactor used is horizontal, which is precisely the unexpected result brought about by winding the amorphous alloy sheets, so that this high-efficiency three-phase horizontal reactor can be installed on the main frame of the high-power AC-DC converter.

[0010] Furthermore, a CAN FD socket is installed on the rear panel, which is an extended CAN interface supporting 64-bit data byte communication, thus allowing the AC-DC converter to be connected to a host computer and form an information node of the CAN FD local area network.

[0011] Furthermore, the equipotential terminals provided on the rear panel are not grounded, but allow multiple high-power AC-DC converters to be connected in parallel through the equipotential terminals and then grounded at a unified single point. The ingenuity of this design is very clever. First, it completely eliminates the possibility of multi-point grounding and the influence of induced circulating current caused by potential differences after multi-point grounding; secondly, it allows multiple AC-DC converters to be connected through equipotential terminals and then grounded at a single point, which increases the reliability of the system grounding.

[0012] Furthermore, the coolant used is ethylene glycol antifreeze. For the cold northern regions, the benefits of using ethylene glycol as the coolant are obvious. Ethylene glycol itself is a coolant with strong water absorption, colorless and slightly sweet, and can significantly lower the freezing point. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, without paying creative labor, they can also draw inferences from these drawings and obtain other similar drawings.

[0014] Figure 1 A high power AC-DC converter appearance Figure 1 ; Figure 2 A high power AC-DC converter appearance Figure 2 ; Figure 3 A high power AC-DC converter appearance Figure 3 ; Figure 4 A high power AC-DC converter appearance Figure 4 ; Figure 5 An internal view of a high-power AC-DC converter with the left side panel removed; Figure 6 An internal view of a high-power AC-DC converter with the right side panel removed; Figure 7 The front and back appearance of the three-phase horizontal reactor; Figure 8 Aluminum alloy main frame appearance Figure 1 ; Fig. 9 Aluminum alloy main frame appearance Figure 2 ; Fig.10 Aluminum alloy main frame appearance Figure 3 ; Fig.11 Aluminum alloy main frame appearance Figure 4 ; Fig.12 Outline drawing of the connecting pipes on both sides of the booster pipeline pump; Fig.13 Aluminum alloy main frame appearance Figure 5 .

[0015] 1 Front panel 1-1 AC380V three-core input socket 1-2 DC five-core output socket 1-3 Front panel mounting holes 1-4 Front panel ribs 2 Left side panel 2-1 Left side panel heat dissipation ribs 3 Right side panel 3-1 Right side panel heat dissipation ribs 4 Rear panel 4-1 CAN FD socket 4-2 Equipotential Terminal 4-3 Rear panel mounting holes 4-4 Rear panel ribs 5 Upper plate 5-1 Upper plate heat dissipation ribs 5-2 Coolant injection hole 5-3 Injection hole screw sealing plug 6 Lower plate 6-1 Lower plate heat dissipation ribs 6-2 Lower plate installation fixing ring hole 7 Three-phase horizontal reactor 7-1 Horizontal support 7-2 Amorphous alloy core 7-3 Copper busbar package 8 DC output side PCB circuit board 8-1 Photocoupler 8-2 Resistors 8-3 Freewheeling diode 8-4 Electrolytic capacitor 8-5 VMOS tube 8-6 VMOS tube heat dissipation fixing hole 9 Aluminum alloy main frame 9-1 Upper round hollow body 9-2 Lower round hollow body 9-3 Rectangular hollow slot 9-4 Circular slot with rectangular opening 9-5 Panel fixing holes 9-6 PCB board installation groove 9-7 U-shaped connecting pipe 10 Booster pipeline pump 10-1 Booster pipeline pump connecting pipe A 10-2 Booster pipeline pump connecting pipe B DETAILED DESCRIPTION

[0016] The specific implementation of the present invention is described below in conjunction with the accompanying drawings. It should be noted that for simplicity, all mounting screws are omitted in the drawings, and secondly, the booster pipeline pump and the booster pipeline pump connecting pipe A and the booster pipeline pump connecting pipe B are only briefly described.

[0017] A high-power AC-DC converter comprises: a front panel (1), a left side panel (2), a right side panel (3), a rear panel (4), an upper panel (5), a lower panel (6), a three-phase horizontal reactor (7), a DC output side PCB circuit board (8), an aluminum alloy main body frame (9), and a booster pipeline pump (10). The main features of the converter are: The aluminum alloy main frame (9) is a core component of a high-power AC-DC converter and is made of aluminum. The upper plate (5) and the lower plate (6) form an I-shaped main frame (9). The upper plate (5) has an upper plate heat dissipation rib (5-1), and the lower plate (6) has a lower plate heat dissipation rib (6-1). An upper circular hollow body (9-1) and a lower circular hollow body (9-2) are formed on the intermediate body connecting the upper plate (5) and the lower plate (6). A rectangular hollow groove (9-3) is formed between the two circular hollow bodies. The intermediate body of the main frame (9) is used to divide a high-power AC-DC converter into two major parts, namely, an AC high-voltage input side and a DC low-voltage output side. The AC high-voltage input side is close to the left plate (2), and the DC low-voltage output side is close to the right plate (3). One end of the upper circular hollow body (9-1) and the lower circular hollow body (9-2) are connected to a U-shaped connecting pipe (9-7), and the other end is connected to a booster pipeline pump (10); the booster pipeline pump connecting pipe A (10-1) and the booster pipeline pump connecting pipe B (10-2) are connected to the two sides of the booster pipeline pump (10); the other ends of the booster pipeline pump connecting pipe A (10-1) and the booster pipeline pump connecting pipe B (10-2) are connected to the circular hollow body (9-1) and the lower circular hollow body (9-2) through the booster pipeline pump connecting pipe A (10-1) and the booster pipeline pump connecting pipe B (10-2), so as to form a hollow cavity; The upper circular hollow body (9-1) and the lower circular hollow body (9-2) are respectively loaded with cooling liquid. Under the push of the booster pipeline pump (10), the cooling liquid starts from the upper circular hollow body (9-1), passes through the U-shaped connecting pipe (9-7), and then returns to the lower circular hollow body (9-2), completing the circulation of the cooling liquid, thereby forming a flowing cooling liquid loop that runs through the cavity from top to bottom. In order to replenish the coolant, a coolant injection hole (5-2) is opened at the central position of the upper plate (5) of the aluminum alloy main frame (9), and the coolant injection hole (5-2) is connected to the upper circular hollow body (9-1). After the coolant is injected, the coolant injection hole (5-2) can be sealed with an injection hole spiral sealing plug (5-3); The upper plate (5) and the lower plate (6) constituting the aluminum alloy main frame (9) are provided with circular grooves (9-4) with rectangular openings to facilitate the insertion of the left plate (2) and the right plate (3); the left plate (2) is provided with a left plate heat dissipation rib (2-1), and the right plate (3) is provided with a right plate heat dissipation rib (3-1); The upper plate (5) and the lower plate (6) constituting the aluminum alloy main frame (9) are provided with PCB board mounting grooves (9-6). In the example, a situation in which the PCB circuit board (8) is inserted into the main frame (9) is specifically drawn. A photocoupler (8-1), a resistor (8-2), a freewheeling diode (8-3), an electrolytic capacitor (8-4) and a VMOS tube (8-5) are welded on the DC low-voltage output side PCB circuit board (8). A VMOS tube heat dissipation fixing hole (8-6) is drilled on the middle body of the main frame (9) to ensure that the heat dissipation surface of the VMOS tube can be closely attached to the middle body of the main frame (9). The pins are welded on the PCB circuit board (8); The upper plate (5) and the lower plate (6) constituting the aluminum alloy main frame (9) are also provided with panel fixing holes (9-5), and screws are passed through the front panel mounting holes (1-3) of the front panel (1) and the rear panel mounting holes (4-3) of the rear panel (4) and then connected to the panel fixing holes (9-5) on the main frame (9); The front panel (1) is provided with a three-core AC380V three-core input socket (1-1) and a DC five-core output socket (1-2); A four-core CAN FD socket (4-1) and an equipotential terminal (4-2) are installed on the rear panel (4). For reliability, the screws of the equipotential terminal (4-2) are directly connected to the aluminum alloy main frame (9).

[0018] Furthermore, the main frame (9) is formed by one-time stretching of an aluminum alloy material and is post-treated by metal anodization, but both ends are processed by wire cutting.

[0019] Furthermore, the front panel (1) is provided with front panel ribs (1-4), and the rear panel (4) is provided with rear panel ribs (4-4).

[0020] Furthermore, a three-phase horizontal reactor (7) is installed on the AC high voltage input side. This is a three-phase reactor with a copper busbar (7-3) wound on an amorphous alloy iron core (7-2). The reactor is directly installed on the main frame (9) through a horizontal bracket (7-1). Since the three-phase horizontal reactor uses a new type of amorphous alloy material as the iron core, compared with cold-rolled silicon steel sheets, the iron loss is extremely small and the volume is greatly reduced, which can effectively resist the surge current impact from the AC power grid. Furthermore, traditional three-phase reactors are all large vertical structures. The present invention In the invention, the three-phase reactor used is horizontal, which is an unexpected result of winding the amorphous alloy sheet. Thus, this efficient three-phase horizontal reactor can be directly installed on the main frame (9) of the high-power AC-DC converter. It can be seen that if the three-phase reactor is not installed, its surge current will cause voltage distortion, thereby greatly reducing the power factor of the system. If the installed three-phase reactor is not horizontal, due to the limitation of the internal space of a high-power AC-DC converter, it cannot accommodate a vertical three-phase reactor, which will cause the engineering design personnel to be at a loss.

[0021] Furthermore, a CAN FD socket (4-1) is installed on the rear panel (4), which is an extended CAN interface supporting 64-bit data byte communication, thereby allowing the AC-DC converter to be connected to a host computer and form an information node of the CAN FD local area network; while conventional AC-DC converters do not have CAN nodes.

[0022] Furthermore, the equipotential terminal (4-2) provided on the rear panel (4) is not grounded, but allows multiple high-power AC-DC converters to be connected in parallel through the equipotential terminal (4-2) and then grounded at a unified single point, thereby completely eliminating the impact of circulating current caused by potential differences caused by multi-point grounding.

[0023] Furthermore, the coolant used is ethylene glycol antifreeze. For the northern regions with cold winters, the benefits of using ethylene glycol as the coolant are very obvious. Ethylene glycol itself is a coolant with strong water absorption, colorless and slightly sweet, and can significantly lower the freezing point. Beneficial Effects

[0024] In summary, the high-power AC-DC converter proposed in the present invention has the following significant beneficial effects: First, the applicant and inventor of the present invention consciously introduced the concept of an aluminum profile main frame in the topological space of a high-power AC-DC converter. The main frame successfully solved three problems with a low-cost and high-reliability design: First, it solved the heat dissipation structure of its power devices under high-power conditions; second, through the slotting treatment on the main frame, the formation environment of distributed capacitance and stray interference sources was destroyed, and the possible crosstalk between the AC high-voltage input side and the DC low-voltage output side was well solved; third, the push-pull overall structural design of a high-power AC-DC converter was solved through the slotting treatment of the I-shaped structure of the main frame.

[0025] Obviously, it is an unexpected progress to install a three-phase horizontal reactor directly on the AC high voltage input side of a high-power AC-DC converter. As a key special device, the three-phase horizontal reactor is a special existence. Because it uses a new type of amorphous alloy material as the iron core and the wound copper bar as the wire package, compared with the cold-rolled silicon steel sheet, the no-load loss and iron loss are extremely small, and the volume is greatly reduced, but it can effectively resist the surge current impact from the AC power grid; further, the traditional three-phase reactors are all bulky vertical structures, which require a separate wiring cabinet, but in this invention, the three-phase horizontal reactor is a special device. In the Ming Dynasty, the three-phase inductor used in the design is horizontal, which is exactly the result of winding the amorphous alloy sheets, so that this efficient three-phase horizontal inductor can be directly installed on the main frame of the high-power AC-DC converter; it can be seen that if the three-phase inductor is not installed, its surge current will cause voltage distortion, thereby greatly reducing the power factor and anti-interference ability of the system; if the installed three-phase inductor is not horizontal, due to the limitation of the internal space of a high-power AC-DC converter, it cannot accommodate a vertical three-phase inductor, which is bound to cause the embarrassment of the engineering design personnel at a loss.

[0026] Conventional AC-DC converters only exist as ordinary information islands of electronic devices, that is, conventional AC-DC converters do not have CAN nodes arranged therein, and cannot serve as information nodes of the CAN local area bus. In the present invention, an extended CAN FD socket is boldly selected, thereby strengthening the technical upgrade of AC-DC converters in the information society. Obviously, if a high-power AC-DC converter is directly used in a charging pile service station in a community, a high-power AC-DC converter based on a CAN FD local area bus interface is a standard configuration of an electric vehicle charging pile with embodied intelligence.

[0027] Obviously, the plug-in expansion solution realized by the embedded grooves on the main frame of the PCB circuit board is also eye-catching, because it provides a wide collection structure of PCB circuit boards, which makes it compact, dense and connected in physical sense; for example, the VMOS tube welded on the PCB circuit board on the DC output side is backed by the main frame of the aluminum profile, which also solves the heat dissipation problem under high current; this heat dissipation mode has strong generalization and coverage capabilities, and has a significant demonstration effect.

[0028] Obviously, the equipotential wiring concept provided by a high-power AC-DC converter completely eliminates the possibility of multi-point grounding in the system and the leakage effect of induced circulating current caused by potential difference after multi-point grounding, because it allows multiple high-power AC-DC converters to be connected in parallel through equipotential wiring terminals and then grounded at a unified single point. Since the equipotential to the ground is only a one-way street, it completely eliminates the multi-point loop to the ground caused by carelessness, and greatly increases the reliability of the system grounding.

Claims

1. A high-power AC-DC converter, comprising: The device is composed of a front panel (1), a left side panel (2), a right side panel (3), a rear panel (4), an upper panel (5), a lower panel (6), a three-phase horizontal reactor (7), a DC output side PCB circuit board (8), an aluminum alloy main frame (9), and a booster pipeline pump (10), and is characterized in that: The aluminum alloy main frame (9) is a core component of a high-power AC-DC converter and is made of aluminum. The upper plate (5) and the lower plate (6) form an I-shaped main frame (9). The upper plate (5) has an upper plate heat dissipation rib (5-1), and the lower plate (6) has a lower plate heat dissipation rib (6-1). An upper circular hollow body (9-1) and a lower circular hollow body (9-2) are formed on the intermediate body connecting the upper plate (5) and the lower plate (6). A rectangular hollow groove (9-3) is formed between the two circular hollow bodies. The intermediate body of the main frame (9) is used to divide a high-power AC-DC converter into two major parts, namely, an AC high-voltage input side and a DC low-voltage output side. The AC high-voltage input side is close to the left plate (2), and the DC low-voltage output side is close to the right plate (3). One end of the upper circular hollow body (9-1) and the lower circular hollow body (9-2) are connected to a U-shaped connecting pipe (9-7), and the other end is connected to a booster pipeline pump (10); the booster pipeline pump connecting pipe A (10-1) and the booster pipeline pump connecting pipe B (10-2) are connected to the two sides of the booster pipeline pump (10); the other ends of the booster pipeline pump connecting pipe A (10-1) and the booster pipeline pump connecting pipe B (10-2) are connected to the circular hollow body (9-1) and the lower circular hollow body (9-2) through the booster pipeline pump connecting pipe A (10-1) and the booster pipeline pump connecting pipe B (10-2), so as to form a hollow cavity; The upper circular hollow body (9-1) and the lower circular hollow body (9-2) are respectively loaded with cooling liquid. Under the push of the booster pipeline pump (10), the cooling liquid starts from the upper circular hollow body (9-1), passes through the U-shaped connecting pipe (9-7), and then returns to the lower circular hollow body (9-2), completing the circulation of the cooling liquid, thereby forming a flowing cooling liquid loop that runs through the cavity from top to bottom. In order to replenish the coolant, a coolant injection hole (5-2) is opened at the central position of the upper plate (5) of the aluminum alloy main frame (9), and the coolant injection hole (5-2) is connected to the upper circular hollow body (9-1). After the coolant is injected, the coolant injection hole (5-2) can be sealed with an injection hole spiral sealing plug (5-3); The upper plate (5) and the lower plate (6) constituting the aluminum alloy main frame (9) are provided with circular grooves (9-4) with rectangular openings to facilitate the insertion of the left plate (2) and the right plate (3); the left plate (2) is provided with a left plate heat dissipation rib (2-1), and the right plate (3) is provided with a right plate heat dissipation rib (3-1); The upper plate (5) and the lower plate (6) constituting the aluminum alloy main frame (9) are provided with PCB board mounting grooves (9-6). In the example, a situation in which the PCB circuit board (8) is inserted into the main frame (9) is specifically drawn. A photocoupler (8-1), a resistor (8-2), a freewheeling diode (8-3), an electrolytic capacitor (8-4) and a VMOS tube (8-5) are welded on the DC low-voltage output side PCB circuit board (8). A VMOS tube heat dissipation fixing hole (8-6) is drilled on the middle body of the main frame (9) to ensure that the heat dissipation surface of the VMOS tube can be closely attached to the middle body of the main frame (9). The pins are welded on the PCB circuit board (8); The upper plate (5) and the lower plate (6) constituting the aluminum alloy main frame (9) are also provided with panel fixing holes (9-5), and screws are passed through the front panel mounting holes (1-3) of the front panel (1) and the rear panel mounting holes (4-3) of the rear panel (4) and then connected to the panel fixing holes (9-5) on the main frame (9); The front panel (1) is provided with a three-core AC380V three-core input socket (1-1) and a DC five-core output socket (1-2); A four-core CAN FD socket (4-1) and an equipotential terminal (4-2) are installed on the rear panel (4). For reliability, the screws of the equipotential terminal (4-2) are directly connected to the aluminum alloy main frame (9).

2. A high-power AC-DC converter according to claim 1, characterized in that: The main frame (9) is formed by one-time stretching of an aluminum alloy material and is subjected to metal anodizing treatment, but both ends are subjected to wire cutting treatment and shaping.

3. A high-power AC-DC converter according to claim 1, characterized in that: The front panel (1) is provided with front panel ribs (1-4), and the rear panel (4) is provided with rear panel ribs (4-4).

4. A high-power AC-DC converter according to claim 1, characterized in that: A three-phase horizontal reactor (7) is installed on the AC high voltage input side. This is a three-phase reactor with a copper busbar (7-3) wound on an amorphous alloy iron core (7-2). The reactor is directly installed on the main frame (9) through a horizontal bracket (7-1).

5. A high-power AC-DC converter according to claim 1, characterized in that: A CAN FD socket (4-1) is mounted on the rear panel (4), which is an extended CAN interface supporting 64-bit data byte communication, thereby allowing the AC-DC converter to be connected to a host computer and form an information node of the CAN FD local area network.

6. A high-power AC-DC converter according to claim 1, characterized in that: The equipotential terminal (4-2) provided on the rear panel (4) is not grounded, but allows multiple high-power AC-DC converters to be connected in parallel through the equipotential terminal (4-2) and then grounded at a unified single point, thereby completely eliminating the impact of circulating current caused by potential differences caused by multi-point grounding.

7. A high-power AC-DC converter according to claim 1, characterized in that: The coolant used is ethylene glycol antifreeze. Ethylene glycol itself is a coolant that has strong water absorption, is colorless and slightly sweet, and can significantly lower the freezing point.

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