CN215204448U - Fuel cell DC/DC converter, fuel cell system and automobile - Google Patents
Fuel cell DC/DC converter, fuel cell system and automobile Download PDFInfo
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- CN215204448U CN215204448U CN202120031778.4U CN202120031778U CN215204448U CN 215204448 U CN215204448 U CN 215204448U CN 202120031778 U CN202120031778 U CN 202120031778U CN 215204448 U CN215204448 U CN 215204448U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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Abstract
The utility model belongs to the technical field of fuel cell power system, especially, relate to a fuel cell DC/DC converter, fuel cell system and car. The fuel cell DC/DC converter comprises an inductance module, a diode module, a switching tube module, a capacitor module, a positive interface and a negative interface; the positive end of the inductance module is connected with the anode of the fuel cell stack, and the negative end of the inductance module is connected with the D end of the switch tube module and the anode of the diode module; the cathode of the diode module is connected with the anode of the capacitor module and the anode interface, and the cathode of the fuel cell stack is connected with the S end of the switch tube module, the cathode of the capacitor module and the cathode interface. The utility model discloses in, fuel cell DC/DC converter has improved the dynamic steady state characteristic and the reliability of fuel cell pile have realized the dynamic change of quick response input source, output load, have guaranteed that whole car operation is reliable.
Description
Technical Field
The utility model belongs to the technical field of fuel cell power system, especially, relate to a fuel cell DC/DC converter, fuel cell system and car.
Background
Fuel cell vehicles are becoming more and more popular in the new energy vehicle market due to their cleanliness, non-pollution, and short refueling time. The fuel cell DC/DC converter is used as the core part of the fuel cell power system and is a link for connecting the fuel cell, the power cell of the whole vehicle and the driving motor. The operation mode of the fuel cell DC/DC converter needs to comprehensively consider the characteristics of the fuel cell and the operation characteristics of the high-voltage power cell.
However, fuel cells have technical barriers such as soft output characteristics, large output power fluctuation, slow dynamic response, and low efficiency; in the prior art, the fuel cell DC/DC converter only has a single working mode, and the fuel cell characteristic and the power cell characteristic cannot be comprehensively considered.
Disclosure of Invention
The utility model discloses to fuel cell DC/DC converter can not the integrated consideration fuel cell characteristic and technical problem such as power battery characteristic among the prior art, provide a fuel cell DC/DC converter, fuel cell system and car.
In view of the above technical problem, an embodiment of the present invention provides a fuel cell DC/DC converter, which includes an inductance module, a diode module, a switching tube module, a capacitance module, a positive interface, and a negative interface; the positive end of the inductance module is connected with the anode of the fuel cell stack, and the negative end of the inductance module is connected with the D end of the switch tube module and the anode of the diode module; the cathode of the diode module is connected with the anode of the capacitor module and the anode interface, and the cathode of the fuel cell stack is connected with the S end of the switch tube module, the cathode of the capacitor module and the cathode interface.
Optionally, the fuel cell DC/DC converter further comprises a first relay and a second relay; the positive pole of the fuel cell stack is connected with the positive end of the inductance module through the first relay, and the negative pole of the fuel cell stack is connected with the S end of the switch tube module and the negative pole of the capacitance module through the second relay.
Optionally, the inductance module comprises at least one inductance, the diode module comprises at least one diode, and the switch tube module comprises at least one switch tube; the negative end of each inductor is connected with the anode of one diode and the D end of one switching tube; the positive ends of all the inductors are connected with the anode of the fuel cell stack, the cathodes of all the diodes are connected with the anode of the capacitor module, and the S ends of all the switch tubes are connected with the cathode of the fuel cell stack and the cathode of the capacitor module.
Optionally, the diode is a silicon carbide-diode;
optionally, the switching tube is a silicon carbide transistor.
Another embodiment of the present invention further provides a fuel cell system, including the above-mentioned fuel cell DC/DC converter.
Optionally, the fuel cell system further comprises a power cell and a fuel cell stack; the positive electrode of the power battery is connected with the positive electrode interface, and the negative electrode of the power battery is connected with the negative electrode interface; the positive pole of the fuel cell stack is connected with the positive end of the inductance module, and the negative pole of the fuel cell stack is connected with the S end of the switch tube module, the negative pole of the capacitance module and the negative pole interface.
Optionally, the fuel cell system further comprises a fuel cell controller and a vehicle control unit, wherein the vehicle control unit is connected with the power cell and the fuel cell controller; the fuel cell controller is connected with the fuel cell stack and the fuel cell DC/DC converter.
Optionally, the fuel cell system further comprises at least one fuel cell auxiliary for providing raw materials for power generation to the fuel cell stack, wherein the anode of the fuel cell auxiliary is connected with the anode of the capacitor module, and the cathode of the fuel cell auxiliary is connected with the cathode of the capacitor module.
Optionally, the fuel cell system further includes at least a whole vehicle power consumption accessory, a positive electrode of the whole vehicle power consumption accessory is connected to a positive electrode of the capacitor module, and a negative electrode of the whole vehicle power consumption accessory is connected to a negative electrode of the capacitor module.
The present invention also provides an automobile, which is characterized by comprising the fuel cell system.
The utility model discloses in, this fuel cell DC/DC converter can realize the switching of different control modes such as constant current mode, constant voltage mode, cold start mode and discharge mode to the characteristic of fuel cell pile and power battery's characteristic have been considered comprehensively, have improved the dynamic and steady state characteristic and the reliability of fuel cell pile have realized the dynamic change of quick response input source, output load, have guaranteed that whole car operation is reliable. In addition, the rear end of the fuel cell DC/DC converter can be connected with a plurality of fuel cell accessories and a plurality of whole vehicle power consumption accessories (a charger, an air conditioner compressor, a voltage reduction DC/DC, a PTC heater and the like), and can be integrated in a whole vehicle distribution box, so that the cost and the installation space of the whole vehicle are saved.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a fuel cell DC/DC converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fuel cell system according to an embodiment of the present invention.
The reference numerals in the specification are as follows:
1. a fuel cell DC/DC converter; 11. an inductance module; 111. an inductance; 12. a diode module; 121. a diode; 13. a switch tube module; 131. a switching tube; 14. a capacitive module; 15. a first relay; 16. a second relay; 17. a positive electrode interface; 18. a negative electrode interface;
2. a fuel cell stack; 3. a power battery; 4. a fuel cell controller; 5. a vehicle control unit; 6. A fuel cell auxiliary; 7. the power consumption auxiliary of the whole vehicle; 8. a first output power distribution; 9. the second output distributes power.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, a fuel cell DC/DC converter 1 according to an embodiment of the present invention includes an inductance module 11, a diode module 12, a switching tube module 13, a capacitance module 14, a positive interface 17, and a negative interface 18; the positive end of the inductance module 11 is connected with the positive electrode of the fuel cell stack 2, and the negative end of the inductance module 11 is connected with the D end (Drain) of the switch tube module 13 and the anode of the diode module 12; the cathode of the diode module 12 is connected to the anode of the capacitor module 14 and the anode interface 17, and the cathode of the fuel cell stack 2 is connected to the S-terminal (Source) of the switch tube module 13, the cathode of the capacitor module 14 and the cathode interface 18. It is understood that the positive electrode interface 17 and the negative electrode interface 18 may connect the power battery 3 and the fuel cell auxiliary 6, and the like. Understandably, the fuel cell auxiliaries 6 include fuel cell auxiliaries for supplying power generation raw materials such as hydrogen gas, air, and the like to the fuel cell stack 2; the fuel cell auxiliary component 6 assists the fuel cell stack 2 to realize the stack start-up and the stack shutdown; in the present invention, the cell stack auxiliary 6 and the power battery 3 are all connected in parallel with the capacitor module 14.
Specifically, when the switching tube module 13 is closed, the current of the fuel cell stack 2 sequentially passes through the inductance module 11 and the switching tube module 13 and returns to the fuel cell stack 2, and at this time, the fuel cell stack 2 charges the inductance module 11. When the switching tube module 13 is disconnected, the fuel cell stack 2 and the inductance module 11 are connected in series, and the total electric energy output by the fuel cell stack 2 and the inductance module 11 is transmitted to the anode interface 17 and the cathode interface 18 through the diode module 12, so as to realize the boosting function of the rear-end equipment connected with the anode interface 17 and the cathode interface 18.
Further, as shown in fig. 2, the positive interface 17 and the negative interface 18 may be connected with a fuel cell auxiliary 6, a power battery 3, a vehicle controller 5 and a fuel cell controller 4; the fuel cell auxiliary 6 and the power cell 3 are both connected in parallel with the capacitor module 14, the vehicle control unit 5 is connected (electrically connected) with the power cell 3 and the fuel cell controller 4, the fuel cell controller 4 is connected with the fuel cell DC/DC converter 1 and the fuel cell stack 2, and when the switching tube module 13 is disconnected and the total electric energy output by the fuel cell stack 2 and the inductor module 11 is provided to a back-end device to enable the back-end device to implement a boost function, the operating mode of the fuel cell DC/DC converter 1 includes:
a constant current mode: when the vehicle control unit 5 detects that the ambient temperature is higher than a preset standard temperature (the preset standard temperature can be set according to actual requirements, such as 5 degrees centigrade, 0 degrees centigrade, -5 degrees centigrade, etc.), the vehicle control unit 5 sends a start instruction corresponding to the constant current mode to the fuel cell controller 4, and after the fuel cell controller 4 receives the start instruction, the fuel cell stack 2 is controlled to start up by the fuel cell DC/DC converter 1, and controls the fuel cell DC/DC converter 1 to switch to a constant current mode, the fuel cell controller 4, by means of a look-up table and calculation, an input current given signal of the fuel cell DC/DC converter 1 can be obtained, to ensure that the fuel cell stack 2 outputs a constant current corresponding to the given signal through the fuel cell DC/DC converter 1.
Constant voltage mode: when the vehicle control unit 5 receives a signal that the power battery 3 is in a power-shortage state, the vehicle control unit 5 sends a starting instruction corresponding to a constant-voltage mode to the fuel battery controller 4, after the fuel battery controller 4 receives the instruction, the working mode of the fuel battery DC/DC converter 1 is determined to be the constant-voltage mode, and the fuel battery stack 2 and the inductance module 11 charge the power battery 3; and simultaneously responding to a request of the vehicle control unit 5, when the power battery 3 exits from a power-lack state, the vehicle control unit 5 sends a constant-current mode working instruction to the fuel battery controller 4, and after the fuel battery controller 4 receives the constant-current mode working instruction, the fuel battery controller 4 controls the fuel battery DC/DC converter 1 to be rapidly switched to a constant-current mode, and the fuel battery pile 2 continuously provides required energy for the vehicle, so that the stable and reliable operation of the vehicle is ensured.
A discharging mode: after the fuel cell stack 2 is closed, residual oxygen and hydrogen react to generate open-circuit high voltage which does not meet the national standard requirement of human body safety voltage and can shorten the service life of the fuel cell stack 2; therefore, after the fuel cell stack 2 is shut down, the vehicle control unit 5 sends a command to enter the discharging mode to the fuel cell controller 4, and after receiving the command, the fuel cell controller 4 controls the fuel cell DC/DC converter 1 to immediately enter the discharging mode, and limits the maximum value of the current or the power output by the fuel cell DC/DC converter 1, so that the fuel cell DC/DC converter 1 protects the fuel cell stack 2 while discharging rapidly, and when the voltage output by the fuel cell DC/DC converter 1 reaches the target voltage value, the fuel cell DC/DC converter 1 stops outputting, and waits for a shutdown command.
A cold start mode, in which when the vehicle controller 5 detects that an ambient temperature value is lower than a preset target value (e.g., 0 ℃), the vehicle controller 5 sends a cold start mode start instruction to the fuel cell controller 4, and after the fuel cell controller 4 receives the cold start mode start instruction, the fuel cell controller 4 controls the fuel cell DC/DC converter 1 to enter the cold start mode; the cold start mode can enter a cold start first mode and a cold start second mode according to different cold start strategies, the cold start first mode uses input current closed loop control, and utilizes self-heating of the fuel cell stack 2 to prevent damage to the fuel cell stack 2 by gradually increasing a current target value input to the fuel cell DC/DC converter 1 and simultaneously limiting the maximum input power of the fuel cell DC/DC converter 1; the second cold start mode is as follows: when the temperature of the fuel cell stack 2 is higher than a set value, the fuel cell controller 4 uses an input constant voltage mode, simultaneously limits the maximum value of the input power of the fuel cell DC/DC converter 1, realizes the high-current stack start of the fuel cell stack, and controls the fuel cell DC/DC converter 1 to rapidly switch to a constant current mode after the temperature reaches the set value.
The utility model discloses in, the power consumptive auxiliary 7 of a plurality of fuel cell auxiliaries 6 and a plurality of whole cars (for example charge machine, air condition compressor, step-down DC and PTC heater etc.) can be connected to 1 rear end of fuel cell DC converter to the power consumptive auxiliary 7 of whole car can be integrated in whole car block terminal, has practiced thrift the cost and the installation space of whole car.
In addition, the fuel cell DC/DC converter 1 can realize the switching of different control modes such as a constant current mode, a constant voltage mode, a cold start mode, a discharge mode and the like, comprehensively considers the characteristics of the fuel cell stack 2 and the characteristics of the power cell 3, improves the dynamic and steady-state characteristics and reliability of the fuel cell stack 2, realizes the quick response to the dynamic changes of an input source and an output load, and ensures the reliable running of the whole vehicle.
In one embodiment, as shown in fig. 1 and 2, the fuel cell DC/DC converter 1 further includes a first relay 15 and a second relay 16; the positive pole of the fuel cell stack 2 is connected with the positive end of the inductance module 11 through the first relay 15, and the negative pole of the fuel cell stack 2 is connected with the S end of the switch tube module 13 and the negative pole of the capacitance module 14 through the second relay 16. It is understood that the first relay 15 and the second relay 16 can control the on-off between the fuel cell stack 2 and the fuel cell DC/DC converter 1, so as to control the stack start and the stack shutdown of the fuel cell stack 2. Further, the first relay 15 and the second relay 16 are integrated in the fuel cell stack 2.
In one embodiment, as shown in fig. 1 and 2, the inductor module 11 includes at least one inductor 111, the diode module 12 includes at least one diode 121, and the switch tube module 13 includes at least one switch tube 131; the negative end of each inductor 111 is connected to the anode of one diode 121 and the D end of one switching tube 131; the positive ends of all the inductors 111 are connected to the positive electrode of the fuel cell stack 2, the cathodes of all the diodes 121 are connected to the positive electrode of the capacitor module 14, and the S ends of all the switch tubes 131 are connected to the negative electrode of the fuel cell stack 2 and the negative electrode of the capacitor module 14.
Further, the fuel cell DC/DC converter 1 includes a plurality of parallel branches formed by the inductors 111 and the diodes 121, and a plurality of parallel branches formed by the inductors 111 and the switching tubes 131, that is, the fuel cell DC/DC converter 1 adopts a plurality of single switching tube parallel current sharing techniques, and combines a large current multi-diode parallel driving circuit to disperse the voltage of the fuel cell stack in the plurality of inductors, thereby increasing the rate of single current rise and fall, greatly reducing the current ripple, reducing the switching frequency, reducing the switching loss, improving the efficiency of the whole vehicle, shortening the response time of the fuel cell DC/DC converter 1, realizing the switching of different working modes such as a constant current mode, a constant voltage mode, a cold start mode, and a discharge mode, and comprehensively considering the characteristics of the fuel cell stack 2 and the characteristics of the power cell 3, the dynamic and steady state characteristics and reliability can be improved according to different state switching modes of the whole vehicle, the dynamic changes of an input source and an output load are quickly responded, and the reliable operation of the whole vehicle is ensured.
In one embodiment, the diode 121 is a silicon carbide-diode (i.e., SIC-diode); it can be understood that the silicon carbide-diode has the characteristics of high-efficiency power conversion, high stability, high integration level and the like, so that the integration level, the conversion efficiency and the reliability of the fuel cell DC/DC converter are obviously improved.
In one embodiment, the switch tube 131 is a silicon carbide transistor (e.g., SIC-mosfet, etc.). Understandably, the carborundum-transistor has characteristics such as low on-resistance, high switching frequency, high temperature working characteristic stability, the utility model discloses a multichannel parallel current PI closed-loop control to guarantee the uniformity that the submodule piece was arranged, reduce drive circuit parasitic parameter simultaneously, realize high-power equilibrium, guarantee that the stress is even, avoid local stress too big, receive inhomogeneous and lead to components and parts to damage.
The utility model also provides a fuel cell system, including foretell fuel cell DC/DC converter 1.
In one embodiment, as shown in fig. 2, the fuel cell system further includes a power cell 3 and a fuel cell stack 2; the positive electrode of the power battery 3 is connected with the positive electrode interface 17, and the negative electrode of the power battery 3 is connected with the negative electrode interface 18; the positive pole of the fuel cell stack 2 is connected to the positive end of the inductance module 11, and the negative pole of the fuel cell stack 2 is connected to the S-terminal of the switch tube module 13, the negative pole of the capacitor module 14, and the negative pole interface 18.
It is understood that the power battery 3 can provide power for the fuel cell auxiliary 6 through the fuel cell DC/DC converter 1 to assist the fuel cell stack 2 in stacking and shutting. Specifically, the fuel cell auxiliaries 6 include fuel cell auxiliaries for supplying power generation raw materials such as hydrogen gas, air, and the like to the fuel cell stack 2; the power battery 3 provides necessary voltage for the fuel battery auxiliary 6 and the whole vehicle power consumption auxiliary 7 through the anode interface 17 and the cathode interface 18, so as to assist the fuel battery electric pile 2 to realize pile starting and pile closing. The utility model discloses in, fuel cell system's integrated level is high, can realize constant current mode, constant voltage mode, cold start mode and discharge mode etc. has comprehensively considered the characteristic of fuel cell galvanic pile 2 and power battery 3's characteristic, has improved the dynamic and stable state characteristic and the reliability of fuel cell galvanic pile 2.
In one embodiment, as shown in fig. 2, the fuel cell system further includes a fuel cell controller 4 and a vehicle controller 5, wherein the vehicle controller 5 connects the power cell 3 and the fuel cell controller 4; the fuel cell controller 4 connects the fuel cell stack 2 and the fuel cell DC/DC converter 1. It is understood that the vehicle control unit 5 and the power battery 3 and the fuel cell controller 4 can communicate with each other through an ECAN network, the fuel cell controller 4 communicates with the fuel cell DC/DC converter 1 through an FCAN network, and the enable wake-up control is performed through an enable signal line; the vehicle control unit 5 is used as an upper computer, the fuel cell controller 4 is used as a lower computer, and the vehicle control unit 5 controls the fuel cell DC/DC converter 1 to be in different working modes through the fuel cell controller 4. The utility model discloses in, fuel cell system's integrated level is high, can switch working modes such as constant current mode, constant voltage mode, cold start mode and discharge mode smoothly through fuel cell DC/DC converter 1.
In one embodiment, as shown in fig. 2, the fuel cell system further includes at least one fuel cell auxiliary 6 for providing power generation raw material to the fuel cell stack 2, wherein the anode of the fuel cell auxiliary 6 is connected to the anode of the capacitor module 14, and the cathode of the fuel cell auxiliary 6 is connected to the cathode of the capacitor module 14. As can be understood, the fuel cell auxiliary 6 includes a cooling water pump, an air compressor, and the like to provide auxiliary heat dissipation and reactant for the fuel cell stack 2, and the fuel cell controller 4 can communicate with the fuel cell DC/DC converter 1 according to the instruction of the vehicle controller 5, so as to complete the switching of the operating modes of the fuel cell system, such as the constant current mode, the constant voltage mode, the cold start mode, and the discharge mode.
Preferably, the positive electrode of the fuel cell auxiliary 6 is connected to the positive electrode of the capacitor module 14 through a first output power distribution 8 (fuse, etc.), and the first output power distribution 8 can prevent the fuel cell auxiliary 6 from being damaged by excessive current in the fuel cell DC/DC converter 1, thereby improving the safety and the service life of the fuel cell system.
In an embodiment, as shown in fig. 2, the fuel cell system further includes at least one vehicle power consumption accessory 7, a positive electrode of the vehicle power consumption accessory 7 is connected to a positive electrode of the capacitor module 14, and a negative electrode of the vehicle power consumption accessory 7 is connected to a negative electrode of the capacitor module 14. The whole vehicle power consumption auxiliary 7 comprises a charger, an air conditioner compressor, a voltage reduction DC/DC (direct current/direct current) heater, a PTC (positive temperature coefficient) heater and the like, and the power battery 3 or the fuel cell stack 2 can supply power to the whole vehicle power consumption auxiliary 7 through the fuel cell DC/DC converter 1 to drive the whole vehicle power consumption auxiliary 7 to run. The utility model discloses in, this fuel cell system integration has whole car power consumptive auxiliary 7 has practiced thrift whole car cost and space, has realized the parallelly connected output of multichannel, has reached the characteristics of high-power output under the finite space, has realized high power density and high integration.
Preferably, the positive electrode of the vehicle power consumption auxiliary 7 is connected with the positive electrode of the capacitor module 14 through a second output power distribution 9 (fuse, etc.), and the second output power distribution 9 can prevent the fuel cell DC/DC converter 1 from being damaged due to excessive current, so that the safety and the service life of the fuel cell system are improved. In addition, the fuel cell system integrates the first output power distribution 8 and the second output power distribution 9 which are connected in parallel in a multi-way mode, the cost of the whole vehicle is saved, and the high power density and the high integration degree of the fuel cell system are achieved.
Another embodiment of the present invention further provides an automobile including the fuel cell system described above.
The above description is only for the embodiment of the fuel cell DC/DC converter and the fuel cell system of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A fuel cell DC/DC converter is characterized by comprising an inductance module, a diode module, a switching tube module, a capacitor module, a positive interface and a negative interface; the positive end of the inductance module is connected with the anode of the fuel cell stack, and the negative end of the inductance module is connected with the D end of the switch tube module and the anode of the diode module; the cathode of the diode module is connected with the anode of the capacitor module and the anode interface, and the cathode of the fuel cell stack is connected with the S end of the switch tube module, the cathode of the capacitor module and the cathode interface.
2. The fuel cell DC/DC converter according to claim 1, characterized in that the fuel cell DC/DC converter further comprises a first relay and a second relay; the positive pole of the fuel cell stack is connected with the positive end of the inductance module through the first relay, and the negative pole of the fuel cell stack is connected with the S end of the switch tube module and the negative pole of the capacitance module through the second relay.
3. The fuel cell DC/DC converter of claim 1 wherein the inductor module comprises at least one inductor, the diode module comprises at least one diode, and the switch tube module comprises at least one switch tube; the negative end of each inductor is connected with the anode of one diode and the D end of one switching tube; the positive ends of all the inductors are connected with the anode of the fuel cell stack, the cathodes of all the diodes are connected with the anode of the capacitor module, and the S ends of all the switch tubes are connected with the cathode of the fuel cell stack and the cathode of the capacitor module.
4. The fuel cell DC/DC converter of claim 3, wherein the diode is a silicon carbide-diode;
and/or the switching tube is a silicon carbide transistor.
5. A fuel cell system comprising the fuel cell DC/DC converter according to any one of claims 1 to 4.
6. The fuel cell system of claim 5, further comprising a power cell and a fuel cell stack; the positive electrode of the power battery is connected with the positive electrode interface, and the negative electrode of the power battery is connected with the negative electrode interface; the positive pole of the fuel cell stack is connected with the positive end of the inductance module, and the negative pole of the fuel cell stack is connected with the S end of the switch tube module, the negative pole of the capacitance module and the negative pole interface.
7. The fuel cell system of claim 6, further comprising a fuel cell controller and a vehicle controller, the vehicle controller connecting the power cell and the fuel cell controller; the fuel cell controller is connected with the fuel cell stack and the fuel cell DC/DC converter.
8. The fuel cell system of claim 6, further comprising at least one fuel cell auxiliary for providing a power generation feedstock to the fuel cell stack, wherein a positive electrode of the fuel cell auxiliary is connected to a positive electrode of the capacitor module, and a negative electrode of the fuel cell auxiliary is connected to a negative electrode of the capacitor module.
9. The fuel cell system of claim 5, further comprising at least one vehicle power consuming accessory, wherein a positive electrode of the vehicle power consuming accessory is connected to a positive electrode of the capacitor module, and a negative electrode of the vehicle power consuming accessory is connected to a negative electrode of the capacitor module.
10. An automobile characterized by comprising the fuel cell system according to any one of claims 5 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120031778.4U CN215204448U (en) | 2021-01-06 | 2021-01-06 | Fuel cell DC/DC converter, fuel cell system and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120031778.4U CN215204448U (en) | 2021-01-06 | 2021-01-06 | Fuel cell DC/DC converter, fuel cell system and automobile |
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| CN215204448U true CN215204448U (en) | 2021-12-17 |
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| CN202120031778.4U Active CN215204448U (en) | 2021-01-06 | 2021-01-06 | Fuel cell DC/DC converter, fuel cell system and automobile |
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