Bidirectional current converter

Abstract

The utility model relates to a bidirectional current converter, which belongs to the technical field of current converters and comprises an upper cover, a conversion circuit board, a base assembly and a bottom plate. Wherein the base assembly is a piece of rectangular metal with upper and lower grooves, bolt holes are formed in the upper side edge of the base assembly, and the base assembly is fixed with the upper cover through bolts; the lower side edge is provided with a right-angle corner connector and is fixed with the bottom plate through the right-angle corner connector; an inductor fixing position is arranged in an upper groove of the base assembly, a heat dissipation flow channel is arranged in a lower groove, and a signal socket, a current socket, a grounding nut, a ventilation valve, a liquid inlet pipe connector and a liquid outlet pipe connector are installed on the side face of the base assembly. The conversion circuit board is arranged in the upper groove and comprises a main control board, a cooling board, a low-voltage area, a high-voltage area and a power area, the cooling board, the low-voltage area, the high-voltage area and the power area are installed on the main control board, heat of the three areas is dissipated through cooling liquid flowing in heat dissipation flow channels below the three areas, and heat of the power area is dissipated through an upper cover above the power area. According to the invention, by reasonably partitioning the heating position of the circuit board and arranging the heat dissipation flow channel, better shock resistance and heat dissipation performance are obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of current converters, and in particular relates to a bidirectional current converter. Background Art

[0002] A bidirectional current converter is a device that can realize current conversion. It can make DC power flow in both directions. During use, the output current can be positive or negative, and the energy generated can flow in both directions, either from the input side to the output side or from the output side to the input side. A bidirectional current converter can realize a bidirectional chopper circuit. If the input voltage is higher than the output voltage, the converter will reduce the voltage to a normal state before outputting it.

[0003] Since bidirectional current converters can be used in supercapacitor groups, multi-battery DC bus bus systems, motor regenerative braking energy recovery and other aspects to achieve the function of maintaining the stability of the capacitor charging voltage, this also brings higher requirements for its heat dissipation performance, seismic performance and stability. The existing bidirectional current converters are lacking in this aspect and are prone to become unstable factors in the entire system. Summary of the invention

[0004] The purpose of the present invention is to provide a bidirectional current converter to address the problems existing in the prior art, which can dissipate heat more evenly and resist vibration in a small volume by setting cooling channels and adjusting the positions of high-pressure areas, low-pressure areas and power areas.

[0005] The technical solution is as follows:

[0006] A bidirectional current converter comprises an upper cover, a conversion circuit board, a base assembly and a bottom plate; wherein the base assembly is a rectangular metal with upper and lower grooves, wherein the upper side thereof is provided with bolt holes and fixed to the upper cover by bolts; wherein the lower side is provided with right-angle brackets and fixed to the bottom plate by right-angle brackets; an inductor fixing position is provided in the upper groove of the base assembly, a heat dissipation channel is provided in the lower groove, and a signal socket, a current socket, a grounding nut, a breathable valve, a liquid inlet pipe joint and a liquid outlet pipe joint are installed on the side; the conversion circuit board is provided in the upper groove, and comprises a main control board and a cooling plate, a low-pressure zone, a high-pressure zone and a power zone installed thereon; the low-pressure zone, the high-pressure zone and the power zone dissipate heat through the coolant flowing in the heat dissipation channel below them, and the power zone also dissipates heat through the upper cover above it.

[0007] Furthermore, the upper cover, the base assembly and the bottom plate are all made of aluminum.

[0008] Furthermore, the coolant is one of deionized pure water, mineral oil, and fluorinated liquid.

[0009] Further, the heat dissipation flow channel is connected to the liquid inlet pipe joint at one end and the liquid outlet pipe joint at the other end, and is a circuitous channel formed by partition plates arranged in a staggered manner.

[0010] Furthermore, the channel bends into a plurality of connected "Ji" characters behind the liquid inlet pipe, and is in the shape of "┐" behind the liquid outlet pipe. The "Ji" character channels are connected to the "┐" character channel through a "Ji" character channel.

[0011] Further, in the low-voltage area of the conversion circuit board, there are a low-voltage fuse, a low-voltage common mode, a low-voltage control board, a low-voltage DC switch, and a low-voltage current sensor connected in series through an aluminum row; in the high-voltage area, there are a high-voltage fuse, a high-voltage common mode, a high-voltage control board, a high-voltage DC switch, a high-voltage current sensor, and a high-voltage filter board connected in series through an aluminum row; in the power area, there are two power boards, two filter boards, an even number of inductors, and an inductor control board. The filter boards are connected to the power boards through aluminum rows, and the two power boards are also connected through aluminum rows. The control lines of the low-voltage control board, the high-voltage control board, and the inductor control board are all electrically connected to the main control board. The main control board is electrically connected to the signal socket. The current socket is divided into a high-voltage current socket connected to the high-voltage fuse and a low-voltage current socket connected to the low-voltage fuse.

[0012] Furthermore, the power boards and the filter boards are symmetrically arranged in the power area. The positions of the inductors correspond to the inductor fixing positions set on the base assembly. After the conversion circuit board is installed in the base assembly, the inductors are embedded in the inductor fixing positions and fixed by pouring sealant. When the upper cover is fixed to the base assembly, the power boards are attached to the bottom of the upper cover.

[0013] Beneficial effects:

[0014] 1) By adjusting the heat generation positions of each area of the conversion circuit board and setting a heat dissipation flow channel below, the present invention makes the heat dissipation of the current converter more uniform and has better heat dissipation performance.

[0015] 2) By reasonable zoning, single-layer arrangement and setting of inductor fixing positions, the volume of the current converter is reduced, and better seismic performance is obtained. Brief description of the drawings

[0016] Figure 1 is an exploded view of the structure of the present invention;

[0017] Figure 2 is the overall appearance view of the present invention;

[0018] Figure 3 is the structure diagram of the conversion circuit board;

[0019] Figure 4 is the structure diagram of the upper groove of the base assembly;

[0020] Figure 5 is the structure diagram of the lower groove of the base assembly;

[0021] Figure 6 Electrical schematic for the converter circuit board.

[0022] Among them: 100 is the upper cover 100, 200 is the conversion circuit board, 201 is the main control board, 202 is the cooling board, 211 is the low-voltage fuse, 212 is the low-voltage control board, 213 is the low-voltage DC switch, 214 is the low-voltage current sensor, 215 is the low-voltage common mode, 221 is the high-voltage fuse, 222 is the high-voltage control board, 223 is the high-voltage DC switch, 224 is the high-voltage current sensor, 225 is the high-voltage common mode, 226 is the high-voltage filter board, 231 1 is the power board, 232 is the filter board, 233 is the inductor control board, 234 is the inductor, 300 is the base assembly, 301 is the bolt hole, 302 is the right angle bracket, 303 is the liquid inlet pipe joint, 304 is the liquid outlet pipe joint, 305 is the grounding nut, 306 is the high voltage current socket, 307 is the low voltage current socket, 308 is the signal socket, 309 is the air valve, 310 is the inductor fixing position, 311 is the partition, 312 is the heat dissipation channel, and 400 is the bottom plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention:

[0024] like Figure 1 A bidirectional current converter is shown, comprising an upper cover 100, a conversion circuit board 200, a base assembly 300 and a bottom plate 400; wherein the base assembly is a rectangular metal with upper and lower grooves, and a bolt hole 301 is provided on the upper side thereof, and is fixed to the upper cover by bolts; a right-angle bracket 302 is installed on the lower side, and is fixed to the bottom plate by the right-angle bracket; an inductor fixing position 310 is provided in the upper groove of the base assembly, a heat dissipation channel 312 is provided in the lower groove, and a signal socket 308, a current socket, a grounding nut 305, a breathable valve 309, a liquid inlet pipe joint 303 and a liquid outlet pipe joint 304 are installed on the side; the conversion circuit board is arranged in the upper groove, and comprises a main control board 201 and a cooling plate 202, a low-pressure zone, a high-pressure zone and a power zone installed thereon, and the low-pressure zone, the high-pressure zone and the power zone dissipate heat through the coolant flowing in the heat dissipation channel below them, and the power zone also dissipates heat through the upper cover above it.

[0025] The upper cover, the base assembly, and the bottom plate are all made of aluminum, which enhances the overall heat dissipation performance.

[0026] The coolant is one of deionized pure water, mineral oil, and fluorinated liquid, all of which have insulating properties. Deionized pure water and fluorinated liquid also have flame retardancy.

[0027] Such as Figure 5 The heat dissipation flow channel shown is connected to the liquid inlet pipe joint at one end and the liquid outlet pipe joint at the other end, and is a tortuous channel formed by staggered partitions 311. The channel bends into a plurality of connected "Ji" characters behind the liquid inlet pipe, and is a "┐" character behind the liquid outlet pipe. The "Ji" character channel is connected to the "┐" character channel through a "Ji" character channel. Since the position above the liquid inlet pipe is the high-voltage area of the conversion circuit board, which generates a large amount of heat, the multiple bends of the channel enable the coolant to take away the heat of the high-voltage area as much as possible. Above the liquid outlet pipe is the low-voltage area, where the heat generation is not large and the coolant has absorbed a lot of heat. Therefore, the number of bends is reduced to increase its flow rate and discharge it as soon as possible.

[0028] Such as Figure 3 In the low-voltage area of the conversion circuit board shown, there are a low-voltage fuse 211, a low-voltage common mode 215, a low-voltage control board 212, a low-voltage DC switch 213, and a low-voltage current sensor 214 connected in series through an aluminum busbar; in the high-voltage area, there are a high-voltage fuse 221, a high-voltage common mode 225, a high-voltage control board 222, a high-voltage DC switch 223, a high-voltage current sensor 224, and a high-voltage filter board 226 connected in series through an aluminum busbar; in the power area, there are two power boards 231, two filter boards 232, an even number of inductors 234, and an inductor control board 233. The filter boards are connected to the power boards through aluminum busbars, and the two power boards are also connected through aluminum busbars. The control lines of the low-voltage control board, the high-voltage control board, and the inductor control board are all electrically connected to the main control board, and the main control board is electrically connected to the signal socket. The current socket is divided into a high-voltage current socket 306 connected to the high-voltage fuse and a low-voltage current socket 307 connected to the low-voltage fuse; the reasonable zoning of the high-voltage area with large heat generation and the low-voltage area with low heat generation not only facilitates subsequent heat dissipation but also avoids mutual electrical interference. The various board components connected through aluminum busbars have better integrity than cable connections and can resist a certain amount of vibration.

[0029] The power boards and the filter boards are symmetrically arranged in the power area. The position of the inductor corresponds to the inductor fixing position set on the base assembly. After the conversion circuit board is installed in the base assembly, the inductor is embedded in the inductor fixing position and fixed by pouring sealant. Fixing the inductor through the inductor fixing position and sealant makes it not easy to be damaged during vibration. When the upper cover is fixed to the base assembly, the power board fits against the bottom of the upper cover, which is convenient for heat dissipation through the upper cover.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles and spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional current converter, characterized in that: It includes an upper cover, a conversion circuit board, a base assembly and a bottom plate; the base assembly is a rectangular metal with upper and lower grooves, and a bolt hole is opened on the upper side thereof, which is fixed to the upper cover by bolts; a right-angle bracket is installed on the lower side, which is fixed to the bottom plate by the right-angle bracket; an inductor fixing position is arranged in the upper groove of the base assembly, a heat dissipation channel is arranged in the lower groove, and a signal socket, a current socket, a grounding nut, a breathable valve, a liquid inlet pipe joint and a liquid outlet pipe joint are installed on the side; the conversion circuit board is arranged in the upper groove, including a main control board and a cooling plate, a low-pressure zone, a high-pressure zone and a power zone installed thereon, the low-pressure zone, the high-pressure zone and the power zone dissipate heat through the coolant flowing in the heat dissipation channel below them, and the power zone also dissipates heat through the upper cover above it.

2. The bidirectional current converter according to claim 1, characterized in that: The upper cover, the base assembly and the bottom plate are all made of aluminum.

3. The bidirectional current converter according to claim 1, wherein: The cooling liquid is one of deionized pure water, mineral oil and fluorinated liquid.

4. The bidirectional current converter according to claim 1, wherein: The heat dissipation channel is a tortuous channel with one end connected to a liquid inlet pipe joint and the other end connected to a liquid outlet pipe joint, and is formed by staggered partitions.

5. The bidirectional current converter according to claim 4, characterized in that: The channel is bent into a plurality of connected "J"-shaped channels behind the liquid inlet pipe and into a "┐"-shaped channel behind the liquid outlet pipe. The "J"-shaped channels are connected to the "┐"-shaped channels through a "J"-shaped channel.

6. The bidirectional current converter according to claim 1, characterized in that: The low-voltage area of ​​the conversion circuit board is provided with a low-voltage fuse, a low-voltage common mode, a low-voltage control board, a low-voltage DC switch and a low-voltage current sensor connected in series through an aluminum busbar; the high-voltage area is provided with a high-voltage fuse, a high-voltage common mode, a high-voltage control board, a high-voltage DC switch, a high-voltage current sensor and a high-voltage filter board connected in series through an aluminum busbar; the power area is provided with two power boards, two filter boards, an even number of inductors and an inductor control board, the filter board and the power board, and the two power boards are connected through an aluminum busbar, the control lines of the low-voltage control board, the high-voltage control board and the inductor control board are all electrically connected to the main control board, the main control board is electrically connected to the signal socket, and the current socket is divided into a high-voltage current socket connected to the high-voltage fuse and a low-voltage current socket connected to the low-voltage fuse.

7. The bidirectional current converter according to claim 6, characterized in that: The power board and filter board are arranged symmetrically in the power area. The position of the inductor corresponds to the inductor fixing position set in the base assembly. After the conversion circuit board is installed in the base assembly, the inductor is embedded in the inductor fixing position and fixed by injecting sealant. When the upper cover and the base assembly are fixed, the power board fits the bottom of the upper cover.

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