CN218456075U - Converter and fuel cell system - Google Patents

Abstract

The application provides a converter and a fuel cell system. The converter includes boost module, step-down module, first radiator, second radiator and inductance, and boost module, step-down module, second radiator and inductance are all located in the first radiator, and boost module and step-down module are located the second radiator and are followed the relative both sides of first direction, and the inductance sets up side by side along the second direction with the second radiator, and the second direction is different with the first direction. The converter and the fuel cell system can effectively shorten the power transmission path between the voltage boosting module and the voltage reducing module, so that the fuel cell system has stable power transmission. In addition, the boosting module, the voltage reduction module, the inductor and the second radiator are integrated in the first radiator, and the integration level of the converter is high.

Description

Converter and fuel cell system

Technical Field

The application relates to the technical field of fuel cells, in particular to a converter and a fuel cell system.

Background

Fuel cells have been in commercial use in heavy-duty long-distance vehicles as an important technical route for carbon reduction in traffic. In addition, the development of high-power fuel cell stacks is also needed in the fields of ships, rail transit, distributed power generation, energy storage and the like.

At present, a hydrogen fuel cell DC-DC is used as a converter, the input and output voltage ranges cannot have an overlapping region, the hydrogen fuel cell DC-DC is applied to medium and small power, and the number of the fuel cell stacks is generally less than 500. With the increase of the power of the fuel cell stack, the number of the series-connected cells can reach 500-900, and the like, and the number of the cells in the fuel cell stack for ships, rail transit and distributed power generation is even more. Because the voltage output by the hydrogen fuel cell is in direct proportion to the number of the cell pieces of the fuel cell stack, the hydrogen fuel cell needs DC-DC to work in a voltage reduction mode under the light load condition and work in a voltage boosting mode under the heavy load condition, so that the output voltage of the hydrogen fuel cell meets the voltage required by different modes. However, in most converters, in order to reduce the influence of the respective heat generation on each other, the boost module and the buck module are arranged in a layout manner and are far apart from each other, which results in a long power transmission path between the boost module and the buck module, large loss, and influence on the power efficiency of the whole hydrogen fuel cell system.

SUMMERY OF THE UTILITY MODEL

The present application provides a converter and a fuel cell system at least for solving the problem of a long power transmission path between a step-up module and a step-down module in the converter.

The application provides a converter is including step-up module, voltage reduction module, first radiator, second radiator and inductance, step-up module the voltage reduction module the second radiator reaches the inductance is all located in the first radiator, step-up module with voltage reduction module locates the second radiator is along the relative both sides of first direction, the inductance with the second radiator sets up side by side along the second direction, the second direction with the first direction is different.

In a possible implementation manner, the boost module includes a first power unit, a first laminated busbar and a first control unit, which are sequentially stacked, and the first power unit is fixedly connected to the second heat sink.

In a possible implementation manner, the voltage dropping module includes a second power unit, a second laminated busbar and a second control unit, which are sequentially stacked, and the second power unit is fixedly connected to the second heat sink.

In a possible implementation manner, the converter further includes an input busbar, and the input busbar is fixedly connected to the second laminated busbar.

In a possible implementation manner, the converter further includes a connection busbar, and the voltage boost module, the voltage reduction module, and the inductor are all fixedly connected to the connection busbar.

In a possible embodiment, the connection busbar includes a first connection portion and a second connection portion, the first connection portion is disposed between the second heat sink and the inductor, one end of the first connection portion is fixedly connected to the second control unit of the voltage reduction module, the second connection portion includes a first end, a second end and a main body portion, the main body portion is located between the first end and the second end, the other end of the first connection portion is fixedly connected to the main body portion, the first end is fixedly connected to the second control unit of the voltage reduction module, and the second end is fixedly connected to the inductor.

In a possible implementation manner, the first heat sink includes a body and an accommodating cavity formed in the body, the accommodating cavity includes a first cavity and a second cavity, the second heat sink, the voltage-reducing module and the voltage-increasing module are all disposed in the first cavity, and the inductor is disposed in the second cavity.

In a possible embodiment, the converter further includes a cooling cover plate, the first heat sink further includes a cooling cavity disposed in the body, the cooling cover plate seals the cooling cavity, the cooling cavity corresponds to the second cavity, and the cooling cavity is configured to cool the inductor disposed in the second cavity.

A fuel cell system is provided that includes a converter according to any of the embodiments of the present application.

In the converter and the fuel cell system that this application provided, set up boost module and step-down module in the relative both sides of second radiator along first direction, directly dispel the heat to boost module and step-down module through the second radiator, boost module and step-down module interval distance are nearer, effectively shorten the power transmission route between boost module and the step-down module, make the fuel cell system have stable power transmission, and the control circuit route between the two has been shortened, when fuel cell system control boost module and step-down module, can make boost module and step-down module switch fast, make the fuel cell system have good dynamic response. The inductor and the second radiator are arranged side by side along the second direction, the first direction is different from the second direction, the second radiator and the inductor are designed in a separated mode, and the influence of heating of the inductor on the boosting module and the voltage reducing module is reduced. In addition, the boosting module, the voltage reduction module, the inductor and the second radiator are integrated in the first radiator, the integration level of the converter is high, and the boosting module, the voltage reduction module, the inductor and the second radiator are further cooled through the first radiator, so that the converter can efficiently cool.

Drawings

In order to more clearly explain the technical solution of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below.

Fig. 1 is a schematic perspective view of a fuel cell system according to an embodiment of the present disclosure;

fig. 2 is a schematic perspective view of a converter according to an embodiment of the present application;

FIG. 3 is a schematic perspective exploded view of a transducer according to an embodiment of the present disclosure;

fig. 4 is a schematic perspective view of another perspective view of a transducer provided in an embodiment of the present application;

FIG. 5 is a schematic perspective view of a converter according to an embodiment of the present application from another perspective;

fig. 6 is a schematic perspective view of a converter according to an embodiment of the present application.

Reference numerals:

a first direction X and a second direction Y;

a converter 100;

the boost circuit comprises a boost module 10, a first power unit 11, a first laminated busbar 13 and a first control unit 15;

the voltage reduction module 20, the second power unit 21, the second laminated busbar 23 and the second control unit 25;

the device comprises a first radiator 30, a body 31, a first side 311, a second side 313, a vent valve 315, a boost-buck output interface 317, a boost-buck control interface 318, a liquid inlet 32, a mounting interface 33, a liquid outlet 34, a containing cavity 35, a first cavity 351, a second cavity 353, a sub-cavity 3531, a stack inlet 36 and a cooling cavity 37;

a second heat sink 40;

an inductor 50;

an input bus bar 60 and a current sensor 61;

a connection busbar 70, a first connection portion 71, a second connection portion 73, a first end 731, a main body portion 733, and a second end 735;

a cooling cover plate 80;

an upper cover plate 90;

a fuel cell 300;

the fuel cell system 1000.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the disclosure may be practiced. Directional phrases used herein, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer to the orientation of the appended drawings and are therefore used herein for better and clearer illustration and understanding of the present application and are not intended to indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the present application.

Moreover, the ordinal numbers used herein to describe the components, such as "first," "second," etc., are used solely to distinguish one from another as to what is described and do not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The present application provides a converter 100. Converter 100 includes boost module 10, buck module 20, first heat sink 30, second heat sink 40, and inductor 50. The boost module 10, the buck module 20, the second heat sink 40 and the inductor 50 are all disposed in the first heat sink 30, and the boost module 10 and the buck module 20 are disposed on two opposite sides of the second heat sink 40 along the first direction X. The inductor 50 and the second heat sink 40 are arranged side by side along a second direction Y, which is different from the first direction X.

Wherein, the inductor 50 is connected in series between the voltage boosting module 10 and the voltage reducing module 20, that is, in the overall control circuit of the converter 100, the inductor 50 is connected in series between the voltage boosting module 10 and the voltage reducing module 20. The first radiator 30 and the second radiator 40 are connected in series, i.e., the first radiator 30 and the second radiator 40 are connected in series in the overall control circuit of the converter 100. The first direction X may be perpendicular to the second direction Y.

At present, a hydrogen fuel cell DC-DC is used as a converter, the input and output voltage ranges cannot have an overlapping region, the hydrogen fuel cell DC-DC is applied to medium and small power, and the number of the fuel cell stacks is generally less than 500. With the increase of the power of the fuel cell stack, the number of the series-connected cells can reach 500-900, and the number of the cells in the fuel cell stack for ships, rail transit and distributed power generation is even more. Because the voltage output by the hydrogen fuel cell is in direct proportion to the number of the cell pieces of the fuel cell stack, the hydrogen fuel cell needs DC-DC to work in a voltage reduction mode under the light load condition and work in a voltage boosting mode under the heavy load condition, so that the output voltage of the hydrogen fuel cell meets the voltage required by different modes. However, in most converters, in order to reduce the influence of the respective heat generation on each other, the boost module and the buck module are arranged in a layout manner and are far apart from each other, which results in a long power transmission path between the boost module and the buck module, large loss, and influence on the power efficiency of the whole hydrogen fuel cell system.

Referring to fig. 1, a fuel cell system 1000 is provided, the fuel cell system 1000 including a converter 100 and a fuel cell 300 according to any embodiment of the present disclosure. The converter 100 is applied to the fuel cell system 1000. The fuel cell 300 may be a hydrogen fuel cell, and the fuel cell 300 is formed by a fuel cell stack formed by connecting a plurality of cell sheets in series, wherein the cell sheets include bipolar plates and membrane electrodes disposed on the single cells. The number of the cells connected in series can be set according to actual conditions, for example, the value range of the number of the cells connected in series can be [500, 900], so that the input voltage and the input voltage of the fuel cell 300 can reach 100V to 900V, and the converter 100 of the present application can be used for increasing or decreasing the voltage of the fuel cell 300, so that the input voltage range and the output voltage range of the fuel cell 300 can have an overlapping region.

Referring to fig. 2 and 3, in the converter 100 of the present application, the voltage boost module 10 and the voltage buck module 20 are disposed on two opposite sides of the second heat sink 40 along the first direction X, the second heat sink 40 directly dissipates heat of the voltage boost module 10 and the voltage buck module 20, the distance between the voltage boost module 10 and the voltage buck module 20 is short, and the power transmission path between the voltage boost module 10 and the voltage buck module 20 is effectively shortened, so that the fuel cell system 1000 has stable power transmission and a control circuit path therebetween is shortened, when the fuel cell system 1000 controls the voltage boost module 10 and the voltage buck module 20, the voltage boost module 10 and the voltage buck module 20 can be rapidly switched, and the fuel cell system 1000 has good dynamic response. The inductor 50 and the second radiator 40 are arranged side by side along a second direction Y, the first direction X is different from the second direction Y, the second radiator 40 and the inductor 50 are designed in a separated manner, and the influence of the heating of the inductor 50 on the boost module 10 and the buck module 20 is reduced; in addition, the boost module 10, the buck module 20, the inductor 50, and the second radiator 40 are integrated in the first radiator 30, the converter 100 is highly integrated, and the boost module 10, the buck module 20, the inductor 50, and the second radiator 40 are further cooled by the first radiator 30, so that the converter 100 can efficiently cool.

The boost module 10 includes a first power unit 11, a first laminated busbar 13 and a first control unit 15 which are sequentially stacked, and the first power unit 11 is fixedly connected with the second heat sink 40. The first power unit 11 is directly fixed on the second heat sink 40, and during the operation of the voltage boost module 10, the first power unit 11 is directly forced to dissipate heat through the second heat sink 40, so that the first power unit 11 in the voltage boost module 10 can dissipate heat with high efficiency, the maximum performance of the first power unit 11 is exerted, and the influence of heat generated by the first power unit 11 on the voltage step-down module 20 can be reduced.

Specifically, in the first direction X, the first power unit 11, the first laminated busbar 13, and the first control unit 15 are sequentially laminated on one side where the second heat sink 40 is disposed. The first power unit 11 is used for voltage conversion, so as to implement boost operation in the converter 100. The first laminated busbar 13 is arranged between the first power unit 11 and the first control unit 15, and voltage is input into the first laminated busbar 13 through the first power unit 11 and is output through the first laminated busbar 13, so that the output voltage of the first laminated busbar 13 is changed compared with the input voltage. The first power unit 11, the first laminated busbar 13 and the first control unit 15 are sequentially stacked in the first direction X, so that a large installation distance does not need to be kept among the first power unit 11, the first laminated busbar 13 and the first control unit 15, the requirement for miniaturization of the boost module 10 is met, the internal structure of the converter 100 is compact, and miniaturization is further achieved.

The first laminated busbar 13 may include a first positive busbar and a first negative busbar which are laminated along a first direction X, and both the first positive busbar and the first negative busbar are electrically connected to the first power unit 11. Further, an insulating layer can be arranged between the first positive busbar and the first negative busbar, so that the first positive busbar and the first negative busbar are insulated.

The first control unit 15 may be a control circuit inside the boost module 10.

Referring to fig. 3, the voltage step-down module 20 includes a second power unit 21, a second laminated busbar 23, and a second control unit 25, which are sequentially stacked, and the second power unit 21 is fixedly connected to the second heat sink 40. The second power unit 21 is directly fixed on the second heat sink 40, and in the working process of the voltage-reducing module 20, the second power unit 21 is directly forced to dissipate heat through the second heat sink 40, so that the second power unit 21 in the voltage-reducing module 20 can dissipate heat with high efficiency, the maximum performance of the second power unit 21 is exerted, and the influence of heat generated by the second power unit 21 on the voltage-increasing module 10 can be reduced.

Specifically, in the first direction X, the second power unit 21, the second laminated busbar 23, and the second control unit 25 are sequentially laminated on the other side of the second heat sink 40. The second power unit 21 is used for voltage conversion, so as to implement the step-down operation in the converter 100. The second laminated busbar 23 is disposed between the second power unit 21 and the second control unit 25, and the voltage is input to the second laminated busbar 23 through the second power unit 21 and output through the second laminated busbar 23, so that the output voltage of the second laminated busbar 23 is changed compared with the input voltage. The second power unit 21, the second laminated busbar 23 and the second control unit 25 are sequentially stacked in the first direction X, so that a larger mounting distance does not need to be kept between the second power unit 21, the second laminated busbar 23 and the second control unit 25, the requirement for miniaturization of the buck module 20 is met, the internal structure of the converter 100 is compact, and miniaturization is further achieved.

Similarly, the second laminated busbar 23 may include a second positive busbar (not shown) and a second negative busbar which are laminated along the first direction X, and both the second positive busbar and the second negative busbar are electrically connected to the second power unit 21. Further, an insulating layer can be arranged between the second positive busbar and the second negative busbar, so that the second positive busbar and the second negative busbar are insulated.

Similarly, the second control unit 25 may be a control circuit inside the voltage-decreasing module 20.

In summary, the first control unit 15 in the boost module 10 and the second control unit 25 in the buck module 20 are respectively located at two opposite sides of the second radiator 40 along the first direction X, so that a control circuit path between the boost module 10 and the buck module 20 can be effectively shortened, the boost module 10 and the buck module 20 can be rapidly switched, and the fuel cell system 1000 has good dynamic response; the first power unit 11 in the voltage boosting module 10 and the second power unit 21 in the second voltage dropping module 20 are directly located at opposite sides of the second radiator 40 along the first direction X, the power transmission path between the voltage boosting module 10 and the voltage dropping module 20 is shortened, and power (voltage) loss of both in the transmission path can be effectively reduced, so that the fuel cell system 1000 has stable power transmission.

Referring to fig. 4 and 6, further, the converter 100 may further include an input bus bar 60 and a current sensor 61, where the input bus bar 60 is fixedly connected to the second laminated bus bar 23. The current sensor 61 is arranged on one side of the input busbar 60 and electrically connected with the input busbar 60, and the current sensor 61 is used for monitoring the current input by the input busbar 60.

First heat sink 30 includes a body 31, a mounting interface 33, and a stack inlet 36. The stack inlet 36 is disposed at a bottom of the body 31 (i.e., a side of the body 31 facing away from the second heat sink 40), and the mounting interface 33 is disposed at a side of the body 31. The mounting interface 33 mounts an end cap to seal the mounting interface 33 and shield a portion of the stack access port 36. One end of the input busbar 60 is located at the stack inlet 36, and a stack conductor in the fuel cell system 1000 penetrates into the first radiator 30 through the stack inlet 36 and is connected with one end of the input busbar 60. The other end of the input busbar 60 is fixedly connected with the second laminated busbar 23.

Referring to fig. 5, further, the converter 100 may further include a connection bus bar 70, and the boost module 10, the buck module 20, and the inductor 50 are all fixedly connected to the connection bus bar 70.

Specifically, the connection busbar 70 includes a first connection portion 71 and a second connection portion 73, the second connection portion 73 includes a first end 731, a body portion 733 and a second end 735, and the body portion 733 is located between the first end 731 and the second end 735. In the second direction Y, the first connection portion 71 is provided between the second heat sink 40 and the inductor 50. One end of the first connection portion 71 is fixedly connected to the second control unit 25 of the voltage-reducing module 20, the other end of the first connection portion 71 is fixedly connected to the main body portion 733, the first end 731 is fixedly connected to the second control unit 25 of the voltage-reducing module 20, and the second end 735 is fixedly connected to the inductor 50. Further, a portion of the main body 733 may be fixedly connected to the inductor 50 to enhance the stability of the connection between the second connection portion 73 and the inductor 50.

Wherein, the first connection portion 71 may have a "Z" shape. The second connection portion 73 may be a plate structure extending in the second direction Y. The first connection portion 71 and the second connection portion 73 reduce the installation distance between the voltage boosting module 10, the voltage reducing module 20 and the inductor 50 as much as possible, so that the inductor 50, the second heat sink 40, the voltage boosting module 10 and the voltage reducing module 20 can be installed in the first heat sink 30 in a compact manner.

It should be noted that, the first laminated busbar 13 (including the first positive busbar and the first negative busbar), the second laminated busbar 23 (including the second positive busbar and the second negative busbar), the input busbar 60, and the connection busbar 70 in the present application may be all copper busbar structures, so as to have better conductivity and structural rationality.

Referring to fig. 2 and 3, the first heat sink 30 further includes a receiving cavity 35 formed in the body 31. Accommodate the chamber 35 and include first chamber 351 and second chamber 353, second radiator 40, step-up module 10 and step-down module 20 all locate in first chamber 351, and inductance 50 locates second chamber 353. Wherein, the second heat sink 40 is fastened and pressed by screws when being fixedly connected with the body 31, and is additionally provided with a sealing ring for water prevention.

It can be seen that, the boost module 10, the buck module 20, and the second heat sink 40 are designed in a structure separated manner from the inductor 50, so that the heat dissipated by the inductor 50 is hardly conducted to the first power unit 11 in the boost module 10 and the second power unit 21 in the buck module 20, and the influence of the heat generated by the inductor 50 on the first power unit 11 and the second power unit 21 can be effectively reduced, so that the first power unit 11 and the second power unit 21 can efficiently dissipate heat through the second heat sink 40, and the maximum performance of the first power unit 11 and the second power unit 21 is exerted.

Further, the second chamber 353 may include a plurality of sub-chambers 3531 spaced apart from each other, and the number of the inductors 50 includes a plurality, and each inductor 50 is disposed in one sub-chamber 3531. Therefore, the influence of the heat emitted by the inductor 50 on the normal operation of the adjacent inductor 50 can be effectively reduced.

Referring to fig. 5 and 6, in one possible embodiment, the converter 100 may further include a cooling cover plate 80. The first heat sink 30 may further include a cooling cavity 37 disposed in the body 31, the cooling cover 80 seals the cooling cavity 37, the cooling cavity 37 corresponds to the second cavity 353, and the cooling cavity 37 is used for cooling the inductor 50 disposed in the second cavity 353.

Specifically, the body 31 includes a first side 311 and a second side 313 opposite to each other, and the receiving cavity 35 is disposed on the first side 311. A cooling chamber 37 is provided at the second side 313, the cooling chamber 37 corresponding to the second chamber 353. Further, the body 31 is further provided with a liquid inlet 32 and a liquid outlet 34, both the liquid inlet 32 and the liquid outlet 34 are communicated with the cooling cavity 37, the liquid inlet 32 is used for inputting the heat dissipation medium into the cooling cavity 37, and the liquid outlet 34 is used for outputting the heat dissipation medium in the cooling cavity 37 to the outside of the first heat sink 30. The heat dissipation medium may be a liquid medium (such as water or a mixture of water and alcohol), or may be a gas medium, which is not limited in this application. The heat dissipation medium is input into the cooling cavity 37 through the liquid inlet 32, the heat dissipation medium in the cooling cavity 37 exchanges heat with the inductor 50 in the second cavity 353, and the heat dissipation medium after heat exchange is output to the outside of the first heat sink 30 through the liquid outlet 34, so that the heat dissipated by the inductor 50 is taken away, and the heat dissipation of the inductor 50 is realized.

Further, the body 31 is further provided with a vent valve 315, a boost-buck output interface 317 and a boost-buck control interface 318, wherein the vent valve 315 is communicated with the accommodating cavity 35 for realizing pressure relief and air leakage of the accommodating cavity 35. The buck-boost output interface 317 is used for connecting other connection interfaces in the fuel cell system 1000, and is used for outputting the output voltage after the buck-boost processing of the converter 100 to other components in the fuel cell system 1000. The buck-boost control interface 318 is used to connect control devices in the fuel cell system 1000 to control the boost module 10 and the buck module 20 in the converter 100.

The converter 100 may further include an upper cover plate 90, where the upper cover plate 90 is fixedly connected to the first heat sink 30 and is used to seal the receiving cavity 35, so as to encapsulate the devices, such as the boost module 10, the buck module 20, the second heat sink 40, the inductor 50, and the like, in the receiving cavity 35.

The foregoing are some embodiments of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations are also regarded as the scope of protection of the present application.

Claims (10)

1. The utility model provides a converter, its characterized in that, includes step-up module, step-down module, first radiator, second radiator and inductance, step-up module step-down module the second radiator reaches the inductance is all located in the first radiator, step-up module with step-down module locates the second radiator is along the relative both sides of first direction, the inductance with the second radiator sets up side by side along the second direction, the second direction with the first direction is different.

2. The converter according to claim 1, wherein the boost module comprises a first power unit, a first laminated busbar and a first control unit which are sequentially stacked, and the first power unit is fixedly connected with the second heat sink.

3. The converter according to claim 1, wherein the buck module comprises a second power unit, a second laminated busbar and a second control unit, which are sequentially stacked, and the second power unit is fixedly connected with the second heat sink.

4. The converter according to claim 3, further comprising an input busbar, wherein the input busbar is fixedly connected with the second laminated busbar.

5. The converter according to claim 1, further comprising a connection busbar, wherein the boost module, the buck module, and the inductor are all fixedly connected to the connection busbar.

6. The converter according to claim 5, wherein the connection busbar comprises a first connection portion and a second connection portion, the first connection portion is disposed between the second heat sink and the inductor, one end of the first connection portion is fixedly connected to the second control unit of the voltage reduction module, the second connection portion comprises a first end, a second end and a main body portion, the main body portion is disposed between the first end and the second end, the other end of the first connection portion is fixedly connected to the main body portion, the first end is fixedly connected to the second control unit of the voltage reduction module, and the second end is fixedly connected to the inductor.

7. The converter of claim 1, wherein the first heat sink comprises a body and a cavity formed in the body, the cavity comprises a first cavity and a second cavity, the second heat sink, the buck module and the boost module are disposed in the first cavity, and the inductor is disposed in the second cavity.

8. The transducer of claim 7, wherein the second chamber includes a plurality of spaced sub-chambers, and wherein the inductor includes a plurality of inductors, each inductor being disposed within one of the sub-chambers.

9. The converter of claim 7, further comprising a cooling cover, wherein the first heat sink further comprises a cooling cavity disposed in the body, wherein the cooling cover seals the cooling cavity, and the cooling cavity corresponds to the second cavity and is configured to cool the inductor disposed in the second cavity.

10. A fuel cell system comprising the converter of any one of claims 1 to 9.

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