Fuel cell power management system and control method

Abstract

The application discloses a fuel cell power management system and a control method. The system comprises a main power supply, a secondary power supply, an auxiliary module and a power management module. The power management module is used for supplying power to the power management module and the auxiliary module by the main power supply if the main power supply works normally; supplying power to the power management module and the auxiliary module by the secondary power supply if the main power supply works abnormally and the secondary power supply works normally. The main power supply comprises a fuel cell power generation module and a voltage reduction module, and the fuel cell power generation module is connected with a main power supply input port of the power management module through the voltage reduction module. The secondary power supply comprises a power grid and a rectification module, and the power grid is connected with a secondary power supply input port of the power management module through the rectification module. The application is beneficial to improving the working stability of the fuel cell device. The application can be widely applied in the technical field of fuel cells.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cell technology, and particularly to a fuel cell power management system and a control method. BACKGROUND

[0002] A fuel cell is an electrochemical device that can directly convert chemical energy stored in fuel and oxidant into electrical energy, and is externally provided with an auxiliary system that can provide the most suitable reaction conditions for the fuel gas and ensure the safety and reliability of the fuel cell device. The power management system is mainly responsible for managing the power supply of each auxiliary system, and the stability of the power supply is one of the important foundations for the normal operation of the fuel cell device. In the related art, power failures often occur, causing the fuel cell device to shut down and affecting the working stability of the fuel cell device. SUMMARY

[0003] The present application aims to at least partially solve one of the problems in the prior art.

[0004] To this end, the present application aims to provide a fuel cell power management system and a control method with stable working.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the embodiments of the present application includes the following aspects:

[0006] On the one hand, the embodiments of the present application provide a fuel cell power management system, comprising: a main power supply, a backup power supply, an auxiliary module and a power management module; the power management module is used for: if the main power supply works normally, supplying power to the power management module and the auxiliary module by the main power supply; if the main power supply works abnormally and the backup power supply works normally, supplying power to the power management module and the auxiliary module by the backup power supply; the main power supply comprises a fuel cell power generation module and a step-down module, the fuel cell power generation module is connected with the main power supply input port of the power management module through the step-down module; the backup power supply comprises a power grid and a rectifier module, the power grid is connected with the backup power supply input port of the power management module through the rectifier module; the power supply output port of the power management module is connected with the auxiliary module. The embodiments of the present application supply power to the battery management module and the auxiliary module by the main power supply and the backup power supply, and set the power supply logic of the main power supply and the backup power supply, which alleviates the problem that the single power failure causes the fuel cell device to shut down, and is conducive to improving the working stability of the fuel cell device.

[0007] In addition, the fuel cell power management system according to the above embodiments of the present application can also have the following additional technical features:

[0008] Further, the fuel cell power management system of the embodiment of the present application, the power management module comprises: a main and auxiliary power automatic switching submodule, the main power input port is connected with the first input end of the main and auxiliary power automatic switching submodule, the auxiliary power input port is connected with the second input end of the main and auxiliary power automatic switching submodule, and the output end of the main and auxiliary power automatic switching submodule is connected with the power output port; the main and auxiliary power automatic switching submodule is used for: if the first input end and the second input end both have power supply input, the output end outputs the electric energy from the first input end; if the first input end has no power supply input and the second input end has power supply input, the output end outputs the electric energy from the second input end.

[0009] Further, in one embodiment of the present application, the main and auxiliary power automatic switching submodule comprises: a main and auxiliary power automatic switching circuit, the main and auxiliary power automatic switching circuit comprises a power supply switch chip, the main power input port is connected with the drain electrode of a first switch device, the source electrode of the first switch device is connected with the power output port, the source electrode of a second switch device, the sixth port of the power supply switch chip, and the gate electrode of the first switch device is connected with the first port of the power supply switch chip; the auxiliary power input port is connected with the drain electrode of the second switch device and the seventh port of the power supply switch chip, the source electrode of the second switch device is connected with the first port of the power supply switch chip through a first resistor, the source electrode of the second switch device is connected with the power output port and the sixth port of the power supply switch chip, and the gate electrode of the second switch device is connected with the eighth port of the power supply switch chip.

[0010] Further, in one embodiment of the present application, the main and auxiliary power automatic switching circuit further comprises: an optical coupler, the first port of the power supply switch chip is connected with the gate electrode of a third switch device, the source electrode of the third switch device is connected with the power output port, and the drain electrode of the third switch device is connected with the first end of the optical coupler; the second end of the optical coupler is located on the same side as the first end of the optical coupler, the second end of the optical coupler is grounded, the fourth end of the optical coupler is connected with a signal output end, the fourth end of the optical coupler is connected with a power supply through a second resistor, and the third end of the optical coupler is grounded; the fuel cell power management system is used for: determining whether the main power supply or the auxiliary power supply is currently powered according to the level of the signal output end.

[0011] Further, in one embodiment of the present application, the power management module comprises: an energy storage unit, the charging port of the energy storage unit is connected with the output end of the main and auxiliary power automatic switching submodule, and the power output port of the energy storage unit is connected with the power output port; the energy storage unit is used for: providing electric energy for the auxiliary module when the output end of the main and auxiliary power automatic switching submodule has no electric energy output.

[0012] Further, in one embodiment of the present application, the energy storage unit can provide the first time length of electric energy greater than or equal to the second time length required for the auxiliary module to close the gas supply.

[0013] Further, in one embodiment of the present application, the first time length is t2 and the second time length is t1; wherein t2≥a*t1, 1.2≤a≤2.5.

[0014] Further, in one embodiment of the present application, the power management module comprises: a main power over / under voltage protection sub-module and a vice power over / under voltage protection sub-module.

[0015] The main power input port is connected with the first input end of the main / vice power automatic switching sub-module through the main power over / under voltage protection sub-module, and the vice power input port is connected with the second input end of the main / vice power automatic switching sub-module through the vice power over / under voltage protection sub-module.

[0016] If the voltage of the main power input port does not belong to the preset voltage range, the main power over / under voltage protection sub-module is in an off state; if the voltage of the vice power input port does not belong to the preset voltage range, the vice power over / under voltage protection sub-module is in an off state.

[0017] Further, in one embodiment of the present application, the main power over / under voltage protection sub-module comprises: a voltage monitoring chip.

[0018] The main power input port is connected with the first port of the voltage monitoring chip, the first port of the voltage monitoring chip is connected with the second port of the voltage monitoring chip through a third resistor, the second port of the voltage monitoring chip is connected with the third port of the voltage monitoring chip through a fourth resistor, the third port of the voltage monitoring chip is connected with the fourth port of the voltage monitoring chip through a fifth resistor, and the fourth port of the voltage monitoring chip is grounded.

[0019] The main power input port is connected with the drain of a fourth switching device, the source of the fourth switching device is connected with the source of a fifth switching device, the drain of the fifth switching device is connected with the first input end of the main / vice power automatic switching sub-module, the gate of the fourth switching device is connected with the gate of the fifth switching device, the gate of the fourth switching device is connected with the eighth port of the voltage monitoring chip, and the seventh port of the voltage monitoring chip is connected with the first input end of the main / vice power automatic switching sub-module.

[0020] On the other hand, the embodiment of the present application proposes a control method of a fuel cell power supply system, which is applied to the fuel cell power management system mentioned above, and the method comprises:

[0021] If the main power supply works normally, the power supply management module and the auxiliary module are supplied with power by the main power supply; if the main power supply works abnormally and the auxiliary power supply works normally, the power supply management module and the auxiliary module are supplied with power by the auxiliary power supply.

[0022] In another aspect, an embodiment of the present application provides a fuel cell power supply management device, comprising:

[0023] at least one processor;

[0024] at least one memory for storing at least one program;

[0025] When the at least one program is executed by the at least one processor, the at least one processor implements the control method of the fuel cell power supply system.

[0026] In another aspect, an embodiment of the present application provides a storage medium, which stores a processor-executable program, and the processor-executable program, when executed by a processor, is used to implement the control method of the fuel cell power supply system.

[0027] The system provided by the embodiment of the present application comprises a main power supply, an auxiliary power supply, an auxiliary module and a power supply management module; the power supply management module is used to: if the main power supply works normally, supply the power supply management module and the auxiliary module with power by the main power supply; if the main power supply works abnormally and the auxiliary power supply works normally, supply the power supply management module and the auxiliary module with power by the auxiliary power supply; the main power supply comprises a fuel cell power generation module and a voltage reduction module, the fuel cell power generation module is connected with a main power supply input port of the power supply management module through the voltage reduction module; the auxiliary power supply comprises a power grid and a rectification module, the power grid is connected with an auxiliary power supply input port of the power supply management module through the rectification module; a power supply output port of the power supply management module is connected with the auxiliary module. The embodiment of the present application supplies the battery management module and the auxiliary module with power by the main power supply and the auxiliary power supply, and sets the power supply logic of the main power supply and the auxiliary power supply, thereby relieving the problem that the single power supply failure causes the fuel cell device to stop working, and facilitating the improvement of the working stability of the fuel cell device. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following introduces the drawings of the related technical solutions in the embodiments of the present application or the prior art. It should be understood that the drawings in the following introduction are only for facilitating the clear description of part of the embodiments in the technical solutions of the present application, and for the person skilled in the art, other drawings can also be obtained without paying creative labor on the basis of these drawings.

[0029] Figure 1Structure diagram of an embodiment of the fuel cell power management system provided by the present application;

[0030] Figure 2 Structure diagram of an embodiment of the power management module provided by the present application;

[0031] Figure 3 Electrical schematic diagram of an embodiment of the main and auxiliary power automatic switching sub-module provided by the present application;

[0032] Figure 4 Electrical schematic diagram of an embodiment of the main power over / under voltage protection sub-module provided by the present application;

[0033] Figure 5 Electrical schematic diagram of an embodiment of the auxiliary power over / under voltage protection sub-module provided by the present application;

[0034] Figure 6 Electrical schematic diagram of an embodiment of the voltage detection provided by the present application;

[0035] Figure 7 Electrical schematic diagram of another embodiment of the voltage detection provided by the present application;

[0036] Figure 8 Flowchart of an embodiment of the control method of the fuel cell power system provided by the present application;

[0037] Figure 9 Structure diagram of an embodiment of the fuel cell power management device provided by the present application. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. For the step numbers in the following embodiments, they are only set for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0039] A fuel cell is an electrochemical device that can directly convert chemical energy stored in fuel and oxidant into electrical energy. The core of the fuel cell device is the stack module, and the auxiliary systems arranged around the stack module include a fuel gas management system, a water treatment system, a power management system, a main control system, an auxiliary test system, etc. The auxiliary systems can provide the most suitable reaction conditions for the fuel gas and ensure the safety and reliability of the fuel cell device.

[0040] The power management system is mainly responsible for managing power supply of each auxiliary system, and stability of the power supply is one of important bases for normal operation of the fuel cell device. At present, the power management system of the fuel cell is usually powered by a single power supply, and if the power supply fails, the fuel cell device will be shut down, and a long time is needed for subsequent restart, which is not conducive to long-term stable and efficient power generation of the fuel cell device.

[0041] The fuel cell power management system and implementation method according to the embodiment of the present application are described in detail below with reference to the accompanying drawings. First, a fuel cell power management system according to an embodiment of the present application is described with reference to the accompanying drawings.

[0042] Figure 1 is a structural schematic diagram of the fuel cell power management system of one embodiment of the present application, and the system specifically includes:

[0043] a main power supply, a backup power supply, an auxiliary module and a power management module;

[0044] The power management module is used for:

[0045] If the main power supply works normally, the main power supply supplies power to the power management module and the auxiliary module;

[0046] If the main power supply works abnormally and the backup power supply works normally, the backup power supply supplies power to the power management module and the auxiliary module;

[0047] The main power supply includes a fuel cell power generation module and a step-down module, and the fuel cell power generation module is connected with the main power supply input port of the power management module through the step-down module. The backup power supply includes a power grid and a rectifier module, and the power grid is connected with the backup power supply input port of the power management module through the rectifier module. The power supply output port of the power management module is connected with the auxiliary module.

[0048] The embodiment of the present application determines to supply power through the main power supply or the backup power supply by logically judging working states of the main power supply and the backup power supply, realizes dual power supply and improves power supply reliability. Specifically, if the main power supply works normally, the working state of the backup power supply does not need to be considered, and the power management module and the auxiliary module are supplied with power by the main power supply. When the main power supply works abnormally and the backup power supply works normally, the power management module and the auxiliary module are supplied with power by the backup power supply. The step-down module is used for step-down conversion of direct current generated by the stack. The rectifier module is used for rectifying alternating current output by the power grid into low-voltage direct current. The auxiliary module is used for providing management including fuel and water vapor and overall control of the fuel cell device, and the auxiliary module includes a water treatment module, a fuel gas management module and a main control module of the fuel cell device.

[0049] In the fuel cell power management system, the main power supply and the auxiliary power supply are used to supply power to each auxiliary module, the main power supply is derived from the fuel cell power module, the auxiliary power supply is derived from the power grid, and the two power supply modes can be switched to each other, thereby avoiding the problem that the single power supply failure causes the fuel cell device to stop, and ensuring long-term stable and efficient power generation of the fuel cell device.

[0050] Optionally, in the fuel cell power management system, the power management module comprises a main auxiliary power automatic switching submodule, the main power input port is connected with the first input end of the main auxiliary power automatic switching submodule, the auxiliary power input port is connected with the second input end of the main auxiliary power automatic switching submodule, and the output end of the main auxiliary power automatic switching submodule is connected with the power output port; the main auxiliary power automatic switching submodule is used for: if the first input end and the second input end have power supply input, the output end outputs the electric energy from the first input end; if the first input end has no power supply input and the second input end has power supply input, the output end outputs the electric energy from the second input end.

[0051] In some possible embodiments, the main auxiliary power automatic switching submodule is used for receiving the electric energy of the main power supply and the auxiliary power supply, and switching the power supply from the main power supply or the auxiliary power supply according to the working conditions of the two power supplies.

[0052] Optionally, in the fuel cell power management system, the main auxiliary power automatic switching submodule comprises a main auxiliary power automatic switching circuit, the main auxiliary power automatic switching circuit comprises a power supply switch chip, the main power input port is connected with the drain electrode of a first switch device, the source electrode of the first switch device is connected with the power output port, the source electrode of a second switch device, the sixth port of the power supply switch chip, and the gate electrode of the first switch device is connected with the first port of the power supply switch chip; the auxiliary power input port is connected with the drain electrode of the second switch device and the seventh port of the power supply switch chip, the source electrode of the second switch device is connected with the first port of the power supply switch chip through a first resistor, the source electrode of the second switch device is connected with the power output port and the sixth port of the power supply switch chip, and the gate electrode of the second switch device is connected with the eighth port of the power supply switch chip.

[0053] In some possible embodiments, the switching of the main power supply and the auxiliary power supply can be realized through the main auxiliary power automatic switching circuit. The selection of the power supply switch chip can be set according to actual needs, and the application does not make specific limitations. Exemplarily, the power supply switch chip can be selected as a TPS2121 chip.

[0054] Optionally, the fuel cell power management system in the embodiment of the present application, the main and auxiliary power automatic switching circuit further comprises: an optocoupler, a first port of the power supply switch chip is connected to a gate of a third switch device, a source of the third switch device is connected to a power supply output port, a drain of the third switch device is connected to a first end of the optocoupler; a second end of the optocoupler is located on the same side as the first end of the optocoupler, the second end of the optocoupler is grounded, a fourth end of the optocoupler is connected to a signal output end, the fourth end of the optocoupler is connected to a power supply through a second resistor, a third end of the optocoupler is grounded; the fuel cell power management system is used to: determine whether the current power supply is the main power supply or the auxiliary power supply according to the level of the signal output end.

[0055] In some possible implementations, the embodiment of the present application introduces the level of the signal output end through the optocoupler to determine the current power supply. Specifically, if the power management module receives a low-level signal, it is determined that the current power supply is the main power supply; if the power management module receives a high-level signal, it is determined that the current power supply is the auxiliary power supply.

[0056] Optionally, the fuel cell power management system in the embodiment of the present application, the power management module comprises: an energy storage unit, a charging port of the energy storage unit is connected to an output end of the main and auxiliary power automatic switching submodule, and an electricity outlet of the energy storage unit is connected to the power supply output port; the energy storage unit is used to: provide electric energy for the auxiliary module when the output end of the main and auxiliary power automatic switching submodule has no electric energy output.

[0057] In some possible implementations, the electricity outlet of the energy storage unit is connected to the power supply output port through an output control submodule, and the output end of the main and auxiliary power automatic switching submodule is connected to the power supply output port through the output control submodule. If the main and auxiliary power automatic switching submodule has no electric energy output, the energy storage unit (i.e., the energy storage unit in the embodiment of the present application) is used to provide electric energy for the auxiliary module for a short time. Specifically, the main and auxiliary power automatic switching submodule has no electric energy output, which can be a failure of the main and auxiliary power automatic switching submodule, or a failure of the main power supply and the auxiliary power supply / cannot normally operate.

[0058] Optionally, the fuel cell power management system in the embodiment of the present application, the first time length during which the energy storage unit can provide electric energy is greater than or equal to a second time length required for the auxiliary module to close the gas supply.

[0059] Optionally, the fuel cell power management system in the embodiment of the present application, the first time length is t2, and the second time length is t1; wherein t2≥a*t1, 1.2≤a≤2.5.

[0060] In some possible implementation manners, the second time includes a time when the power management module detects the input voltage of the first input end and the second input end (or the output voltage of the output end), a time when the power management module sends the input voltage information to the main control module of the fuel cell device, a time when the main control module processes the voltage information, a time when the main control module sends an action instruction to the auxiliary module of the fuel cell device according to the processing result, and a time when the auxiliary module of the fuel cell device performs an operation according to the instruction.

[0061] Optionally, the fuel cell power management system in the embodiment of the present application, the power management module comprises: a main power over / under voltage protection submodule and a backup power over / under voltage protection submodule.

[0062] The main power input port is connected with the first input end of the main / backup power automatic switching submodule through the main power over / under voltage protection submodule, and the backup power input port is connected with the second input end of the main / backup power automatic switching submodule through the backup power over / under voltage protection submodule.

[0063] If the voltage of the main power input port does not belong to the preset voltage range, the main power over / under voltage protection submodule is in an off state; if the voltage of the backup power input port does not belong to the preset voltage range, the backup power over / under voltage protection submodule is in an off state.

[0064] In some possible implementation manners, the preset voltage range can be set according to the power consumption demand of the power management module and the auxiliary module. The main power over / under voltage protection submodule and the backup power over / under voltage protection submodule are used for judging whether the voltage of the output power of the main power / backup power meets the subsequent power supply demand, and if not, cutting off the power supply, thereby providing power supply reliability.

[0065] Optionally, the fuel cell power management system in the embodiment of the present application, the main power over / under voltage protection submodule comprises: a voltage monitoring chip.

[0066] The main power input port is connected with the first port of the voltage monitoring chip, the first port of the voltage monitoring chip is connected with the second port of the voltage monitoring chip through a third resistor, the second port of the voltage monitoring chip is connected with the third port of the voltage monitoring chip through a fourth resistor, the third port of the voltage monitoring chip is connected with the fourth port of the voltage monitoring chip through a fifth resistor, and the fourth port of the voltage monitoring chip is grounded.

[0067] The main power input port is connected with the drain of the fourth switch device, the source of the fourth switch device is connected with the source of the fifth switch device, the drain of the fifth switch device is connected with the first input end of the main and auxiliary power automatic switching sub-module, the gate of the fourth switch device is connected with the gate of the fifth switch device, the gate of the fourth switch device is connected with the eighth port of the voltage monitoring chip, the seventh port of the voltage monitoring chip is connected with the first input end of the main and auxiliary power automatic switching sub-module, and the fifth port of the voltage monitoring chip is connected with the main power input port through the sixth resistor.

[0068] In some possible embodiments, the auxiliary power over / under voltage protection sub-module has the same circuit structure as the main power over / under voltage protection sub-module. The voltage monitoring chip in the embodiments of the application can be a MAX6497 chip, and a voltage monitoring chip with similar functions can also be selected by those skilled in the art according to actual needs, and the application does not make specific limitations.

[0069] Next, a fuel cell power management system proposed in the application will be described in detail with reference to a specific embodiment. Specifically, as shown in FIG. 1, the system includes a fuel cell power generation module 1, a power grid 3, a fuel cell device auxiliary module, a power management module 6, a DC-DC step-down module 2 and an AC-DC rectifier module 5. Figure 1

[0070] The main power supply 10 includes the fuel cell power generation module and the DC-DC step-down module, and the auxiliary power supply 11 includes the power grid and the AC-DC rectifier module. The main power supply power supply line is electrically connected between the fuel cell power generation module, the DC-DC step-down module and the main power input port of the power management module, and the auxiliary power supply power supply line is electrically connected between the power grid, the AC-DC rectifier module and the auxiliary power input port of the power management module. The power output port of the power management module is electrically connected with the fuel cell device auxiliary module.

[0071] When the main power supply is normally running, the power management module is powered by the main power supply, otherwise, the power management module is automatically switched to be powered by the auxiliary power supply. Specifically, the definition of normal running (i.e., normal operation in the embodiments of the application) is that the main (auxiliary) power supply can provide electric energy, and the voltage value and the current value meet the specified range.

[0072] In the fuel cell power management system, the main power supply and the auxiliary power supply are used to supply power to each fuel cell device auxiliary module, the main power supply is derived from the fuel cell power generation module, the auxiliary power supply is derived from the power grid, and the two power supply modes of the main power supply and the auxiliary power supply can be switched to each other, thereby avoiding the problem that the single power supply failure causes the fuel cell device to stop running, and ensuring the long-term stable and efficient power generation of the fuel cell device.

[0073] ​Specifically, when the main power supply is in normal operation, the power management module is powered by the main power supply, so that the power of the main power supply is transmitted to each auxiliary module; when the main power supply cannot operate normally, but the auxiliary power supply operates normally, the system automatically switches to power the power management module by the auxiliary power supply, and the power of the main power supply cannot be transmitted to each auxiliary module through the power management module; when the main power supply resumes normal operation, the system automatically switches back to power the power management module by the main power supply.

[0074] The fuel cell power generation module is used to convert the chemical energy of fuel into electrical energy through high-temperature electrochemical reaction; the DC-DC step-down module is used to step down the direct current generated by the stack to power the power management module; the AC-DC rectifier module is used to rectify the alternating current output by the power grid into low-voltage direct current to power the power management module; and the fuel cell device auxiliary module is used to provide management of fuel, water vapor, etc. and overall control of the fuel cell device.

[0075] Further, the fuel cell device auxiliary module includes a water treatment module 7, a fuel gas management module 8, and a fuel cell device master control module 9.

[0076] Further, the fuel cell power management system further includes a UPS module 4, and the power grid is electrically connected to the AC-DC rectifier module through the UPS. The UPS module (uninterruptible power supply) is used to rectify the 380V AC power of the power grid into direct current, filter and stabilize the voltage, and then transmit the direct current to the internal storage battery, and then invert the direct current of the storage battery into 220V AC power output.

[0077] Further, referring to Figure 2 As shown in the figure, the power management module includes a main and auxiliary power supply automatic switching submodule, which has a first input end, a second input end and an output end; the main power supply input port is electrically connected to the first input end, the auxiliary power supply input port is electrically connected to the second input end, and the output end is electrically connected to the power output port; when the main power supply operates normally, the power output from the output end is from the main power supply, otherwise the power output from the output end is from the auxiliary power supply.

[0078] It can be understood that the main and auxiliary power supply automatic switching submodule has the following functions: when the first input end and the second input end both have power supply input, the output end outputs power from the first input end; when the first input end has no power supply input and the second input end has power supply input, the output end outputs power from the second input end. In addition, only when the main power supply operates normally, the first input end can receive the power output by the main power supply; only when the auxiliary power supply operates normally, the second input end can receive the power output by the auxiliary power supply. In addition, the power source of the output end of the main and auxiliary power supply automatic switching submodule can be automatically switched according to the power supply of the first input end and the second input end, without active control.

[0079] Further, referring to Figure 3 The main and auxiliary power automatic switching sub-module has a main and auxiliary power automatic switching circuit, which includes a chip U3 (i.e. the power switch chip in the embodiment of the application), a switching device Q5 (i.e. the first switching device), a switching device Q6 (i.e. the second switching device), and a resistor R9 (i.e. the first resistor).

[0080] The drain of the switching device Q5 is connected to the first input end VIN3, the source of the switching device Q5 is connected to the output end VOUT3, the 6th pin of the chip U3 (i.e. the sixth port of the voltage switch chip in the embodiment of the application), and the source of the switching device Q6, and the gate of the switching device Q5 is connected to the 1st pin of the chip U3 (i.e. the first port of the voltage switch chip in the embodiment of the application).

[0081] The drain of the switching device Q6 is connected to the second input end VIN4 and the 7th pin of the chip U3 (i.e. the seventh port of the voltage switch chip in the embodiment of the application), the gate of the switching device Q6 is connected to the 8th pin of the chip U3 (i.e. the eighth port of the voltage switch chip in the embodiment of the application), and the source of the switching device Q6 is connected to the output end VOUT3, one end of the resistor R9, and the 6th pin of the chip U3, and the other end of the resistor R9 is connected to the 1st pin of the chip U3.

[0082] Of course, it can be understood that the switching device can be a MOS tube or other devices that can achieve the same function, and the application does not make specific limitations. Specifically, when the main power supplies power to the first input end VIN3 and the auxiliary power supplies power to the second input end VIN4, the drain-source diode of the switching device Q5 is turned on, the 6th pin of the chip U3 is pulled up, and the 8th pin of the chip U3 controls the switching device Q6 to be turned off, and then the voltage of the 1st pin of the chip U3 is pulled down and controls the switching device Q5 to be turned on; at this time, the power of the output end VOUT3 is derived from the main power of the first input end VIN3, and since the on-resistance of the switching device Q5 is small, the voltage of the output end VOUT3 of the main and auxiliary power automatic switching sub-module is approximately equal to the voltage value of the main power.

[0083] In other embodiments, when the main power cannot supply power to the first input end VIN3 and the auxiliary power supplies power to the second input end VIN4, the voltage of the 6th pin of the chip U3 is lower than the voltage of the 7th pin, the voltage of the 8th pin is pulled down and controls the switching device Q6 to be turned on, and then the voltage of the 1st pin of the chip U3 is pulled up and controls the switching device Q5 to be turned off; at this time, the power of the output end VOUT3 is derived from the auxiliary power of the second input end VIN4, and since the on-resistance of the switching device Q6 is small, the voltage of the output end VOUT3 of the main and auxiliary power automatic switching sub-module is approximately equal to the voltage value of the auxiliary power.

[0084] In some embodiments, when the main power supply supplies power to the first input end VIN3 and the auxiliary power supply supplies power to the second input end VIN4, the voltage of the 1st pin of the chip U3 is pulled low and controls to turn on the switching device Q5, at this time, the 6th pin of the pull-up chip U3 is connected through the drain-source diode of the switching device Q5, and the 8th pin controls to turn off the switching device Q6, and then the voltage of the 1st pin of the chip U3 is pulled low and controls to turn on the switching device Q5; at this time, the power of the output end VOUT3 is derived from the main power supply of the first input end VIN3, and since the on-resistance of the switching device Q5 is small, the voltage of the output end VOUT3 of the main auxiliary power supply automatic switching sub-module is approximately equal to the voltage value of the main power supply.

[0085] Further, the main auxiliary power supply automatic switching circuit further comprises: a switching device Q7 (i.e. a third switching device), an optocoupler U4, and a resistor R10 (i.e. a second resistor);

[0086] The gate of the switching device Q7 is connected to the 1st pin of the chip U3, the source of the switching device Q7 is connected to the output end VOUT3, and the drain of the switching device Q7 is connected to the 1st pin of the optocoupler U4 (i.e. the first end of the optocoupler in the embodiment of the application);

[0087] The 2nd pin (i.e. the second end of the optocoupler in the embodiment of the application) of the optocoupler U4 is located on the same side as the 1st pin and is connected to the ground, the 4th pin (i.e. the fourth end of the optocoupler in the embodiment of the application) of the optocoupler U4 is located on the same side as the 3rd pin (i.e. the third end of the optocoupler in the embodiment of the application), the 4th pin of the optocoupler U4 is respectively connected to one end of the resistor R10 and the signal output end IO, the other end of the resistor R10 is connected to the working voltage VCC (i.e. the power supply in the embodiment of the application), and the 3rd pin of the optocoupler U4 is connected to the ground.

[0088] In some embodiments, when the main power supply supplies power to the first input end VIN3 and the auxiliary power supply supplies power to the second input end VIN4, the voltage of the 1st pin of the chip U3 is pulled low and controls to turn on the switching device Q5, at this time, the 6th pin of the pull-up chip U3 is connected through the drain-source diode of the switching device Q5, and the 8th pin controls to turn off the switching device Q6, and then the voltage of the 1st pin of the chip U3 is pulled low and controls to turn on the switching device Q5; at this time, the power of the output end VOUT3 is derived from the main power supply of the first input end VIN3, and since the on-resistance of the switching device Q5 is small, the voltage of the output end VOUT3 of the main auxiliary power supply automatic switching sub-module is approximately equal to the voltage value of the main power supply.

[0089] In some embodiments, when the main power supply supplies power to the first input end VIN3 and the auxiliary power supply supplies power to the second input end VIN4, the voltage of the 1st pin of the chip U3 is pulled low and controls to turn on the switching device Q5, at this time, the 6th pin of the pull-up chip U3 is connected through the drain-source diode of the switching device Q5, and the 8th pin controls to turn off the switching device Q6, and then the voltage of the 1st pin of the chip U3 is pulled low and controls to turn on the switching device Q5; at this time, the power of the output end VOUT3 is derived from the main power supply of the first input end VIN3, and since the on-resistance of the switching device Q5 is small, the voltage of the output end VOUT3 of the main auxiliary power supply automatic switching sub-module is approximately equal to the voltage value of the main power supply.

[0090] Further, the power management module further comprises an energy storage component (i.e. the energy storage unit in the embodiment of the present application), the charging port of the energy storage component is electrically connected with the output end of the main / auxiliary power automatic switching sub-module, and the power outlet of the energy storage component is electrically connected with the power output port; when the main / auxiliary power automatic switching sub-module has no power output, the energy storage component can supply power to the fuel cell device auxiliary module for a short time.

[0091] Further, the fuel cell device auxiliary module comprises a fuel gas management module, and the power supply time of the energy storage component at least meets the operation of the fuel gas management module for closing the fuel gas supply.

[0092] It can be understood that the energy storage component can store power from the output end of the main / auxiliary power automatic switching sub-module; when the output end of the main / auxiliary power automatic switching sub-module has no power output (the reasons can be that the main power supply and the auxiliary power supply cannot normally operate, or the main / auxiliary power automatic switching sub-module is faulty, etc.), the fuel cell device needs to be shut down in an emergency, the fuel cell device auxiliary module needs to be closed or in a standby state, and in particular, the fuel gas management module needs to be closed to avoid the danger of fuel gas leakage, etc.; when the main power supply and the auxiliary power supply cannot supply power to the auxiliary module, the energy storage component can supply power to the auxiliary module for a short time, thereby guaranteeing the power required by the fuel gas management module for closing the fuel gas supply and the power required by other auxiliary modules for performing related actions.

[0093] Further, the power management module further comprises a power management module control chip, which is electrically connected with the output end of the main / auxiliary power automatic switching sub-module and the power outlet of the energy storage component, respectively.

[0094] When the main / auxiliary power automatic switching sub-module normally outputs power, the power supply of the control chip is derived from one of the main power supply and the auxiliary power supply; when the main / auxiliary power automatic switching sub-module has no power output, the power supply of the control chip is derived from the energy storage component.

[0095] Further, the time from when the fuel cell device detects that the main / auxiliary power automatic switching sub-module cannot output power to when the fuel cell device performs the coping action is t1, the power supply time of the energy storage component is t2, and t2≥t1; preferably t2>t1; preferably t2>a*t1, wherein 1.2≤a≤2.5.

[0096] Specifically, if the voltages of the main power supply input port and the auxiliary power supply input port do not meet the requirements, the main / auxiliary power automatic switching sub-module cannot receive power from the main power supply and the auxiliary power supply, the fuel cell device needs to cope in an emergency, and the power supply time t2 of the energy storage component and the coping time t1 of the fuel cell device meet the above conditions, so as to ensure that the fuel cell device safely and stably enters the shutdown or standby state.

[0097] The detection point used by the fuel cell device to detect that the main and auxiliary power automatic switching sub-module cannot output power can be the voltage of the first and second input terminals of the main and auxiliary power automatic switching sub-module, or the voltage of the output terminal.

[0098] Further, t1 includes the sum of the time when the power management module detects the input voltage of the first and second input terminals (or the output voltage of the output terminal), the time when the power management module sends the input voltage information to the main control module of the fuel cell device, the time when the main control module processes the voltage information, the time when the main control module sends an action instruction to the fuel cell device auxiliary module according to the processing result, and the time when the fuel cell device auxiliary module performs an operation according to the instruction.

[0099] Further, the power management module further includes a main power over-voltage and under-voltage protection sub-module and an auxiliary power over-voltage and under-voltage protection sub-module.

[0100] The main power input port is electrically connected to the first input terminal of the main and auxiliary power automatic switching sub-module through the main power over-voltage and under-voltage protection sub-module, and the auxiliary power input port is electrically connected to the second input terminal of the main and auxiliary power automatic switching sub-module through the auxiliary power over-voltage and under-voltage protection sub-module.

[0101] When the voltage of the main power input port does not meet the range requirement, the main power over-voltage and under-voltage protection sub-module is in an open state, and the power of the main power cannot be supplied to the main and auxiliary power automatic switching sub-module. When the voltage of the auxiliary power input port does not meet the range requirement, the auxiliary power over-voltage and under-voltage protection sub-module is in an open state, and the power of the auxiliary power cannot be supplied to the main and auxiliary power automatic switching sub-module.

[0102] It can be understood that by arranging the main (auxiliary) power over-voltage and under-voltage protection sub-module between the main (auxiliary) power input port and the main and auxiliary power automatic switching sub-module, the electrical connection between the main (auxiliary) power and the main and auxiliary power automatic switching sub-module can be automatically turned on and off according to the voltage of the power output by the main (auxiliary) power.

[0103] Further, referring to the main power over-voltage and under-voltage protection sub-module and the auxiliary power over-voltage and under-voltage protection sub-module shown in Figure 4 Figure 5 ​The shown auxiliary power supply over-voltage and under-voltage protection sub-module, the main power supply over-voltage and under-voltage protection sub-module has a main power supply over-voltage and under-voltage protection circuit, which comprises: a voltage monitoring chip U1 (i.e. the voltage monitoring chip in the embodiment of the application), a switching device Q1 (i.e. the fourth switching device in the embodiment of the application), a switching device Q2 (i.e. the fifth switching device in the embodiment of the application), a resistor R1 (i.e. the third resistor in the embodiment of the application), a resistor R2 (i.e. the fourth resistor in the embodiment of the application), a resistor R3 (i.e. the fifth resistor in the embodiment of the application); the auxiliary power supply over-voltage and under-voltage protection sub-module has an auxiliary power supply over-voltage and under-voltage protection circuit, which comprises: a voltage monitoring chip U2, a switching device Q3, a switching device Q4, a resistor R5, a resistor R6, a resistor R7. The auxiliary power supply over-voltage and under-voltage protection sub-module and the main power supply over-voltage and under-voltage protection sub-module have the same circuit structure.

[0104] The drain of the switching device Q1 (Q3) is connected with the main (auxiliary) power supply input port VIN1 (VIN2), the 1 pin of the voltage monitoring chip U1 (U2), and one end of the resistor R1 (R5) respectively;

[0105] The other end of the resistor R1 (R5) is connected with the 2 pin of the voltage monitoring chip U1 (U2) and one end of the resistor R2 (R6) respectively, the other end of the resistor R2 (R6) is connected with the 3 pin of the voltage monitoring chip U1 (U2) and one end of the resistor R3 (R7) respectively, the other end of the resistor R3 (R7) is connected with the 4 pin of the voltage monitoring chip U1 (U2) and grounded;

[0106] The gate of the switching device Q1 (Q3) is connected with the 8 pin of the voltage monitoring chip U1 (U2), the source of the switching device Q1 (Q3) is connected with the source of the switching device Q2 (Q4);

[0107] The gate of the switching device Q2 (Q4) is connected with the 8 pin of the voltage monitoring chip U1 (U2), the drain of the switching device Q2 (Q4) is connected with the circuit output end VOUT1 (VOUT2), and the 7 pin of the voltage monitoring chip U1 (U2) is connected with the circuit output end VOUT1 (VOUT2).

[0108] It should be noted that the n pin of the voltage monitoring chip is the n port of the voltage monitoring chip in the embodiment of the application.

[0109] Specifically, the over-voltage and under-voltage protection circuits of the main power supply and the auxiliary power supply are the same, and the main power supply over-voltage and under-voltage protection circuit is taken as an example for description. The 2 pin of the voltage monitoring chip U1 is a under-voltage comparator input, and the 3 pin is an over-voltage comparator input; the over-voltage and under-voltage protection value setting resistor of the voltage monitoring chip U1 is composed of resistors R1, R2 and R3, and the resistor value calculation formula is as follows:

[0110] V OSVH1 is the over-voltage protection threshold voltage; LEAK VH1 is the over-voltage protection threshold voltage; OS and I LEAK determined by the parameters of the chip U1;

[0111] VL1 is the under-voltage protection threshold voltage;

[0112] VH1 is the over-voltage protection threshold voltage;

[0113] For example, the chip U1 selected in the case has V OS 3mV, I LEAK 10nA, the under-voltage protection threshold voltage VL1 is set to 3.5V, and the over-voltage protection threshold voltage VH1 is set to 18V; according to the above formula, the resistance R1 is calculated to be 1.8MΩ, the resistance R2 is calculated to be 241.7kΩ, and the resistance R3 is calculated to be 58.3kΩ.

[0114] When the voltage VIN1 of the main power input port satisfies VL1≤VIN1≤VH1, the 8th pin of the monitoring chip U1 controls to open the switching device Q1 and the switching device Q2, and the main power output voltage VOUT1 is obtained. Since the on-resistance of the switching device Q1 and the switching device Q2 is small, the voltage value of the circuit output terminal VOUT1 is approximately equal to the voltage value of the main power input VIN1;

[0115] When the voltage VIN1 of the main power input port satisfies VIN1<VL1 or VIN1>VH1, the 8th pin of the monitoring chip U1 controls to close the switching device Q1 and the switching device Q2, i.e. to disconnect the power supply of the main and auxiliary power automatic switching sub-module;

[0116] The 7th pin of the voltage monitoring chip U1 is connected to the circuit output terminal VOUT1, and the function is to monitor the voltage value of the circuit output terminal VOUT1.

[0117] In some embodiments, referring to the voltage detection circuit shown in Figure 6 , the voltage of the circuit output terminal VOUT1 is detected by the resistance R11 and the resistance R12. In other embodiments, referring to the voltage detection circuit shown in Figure 7 , the voltage of the circuit output terminal VOUT2 is detected by the resistance R13 and the resistance R14.

[0118] Further, the main (auxiliary) power over-voltage and under-voltage protection circuit further comprises a fuse F1 (F2), one end of the fuse F1 (F2) is connected to the main (auxiliary) power input port VIN1 (VIN2), and the other end of the fuse F1 (F2) is connected to the 1st pin of the voltage monitoring chip U1 (U2), the drain of the switching device Q1 (Q3) and one end of the resistance R1 (R5) respectively.

[0119] It can be understood that the fuse F1 (F2) is the overcurrent protection of the main (auxiliary) power input port VIN1 (VIN2), and the fuse will be fused when the current exceeds the protection value of the fuse.

[0120] Further, the power management module further comprises an output control submodule, and an output end of the main and auxiliary power automatic switching submodule is electrically connected with the power output port through the output control submodule. Further, the power outlet of the energy storage component is electrically connected with the power output port through the output control submodule.

[0121] Specifically, the output control submodule can be used to control the power supply of the power management module to each fuel cell auxiliary module.

[0122] The system provided by the embodiment of the application comprises a main power supply, an auxiliary power supply, an auxiliary module and a power management module; the power management module is configured to supply power to the power management module and the auxiliary module by the main power supply if the main power supply is normal; supply power to the power management module and the auxiliary module by the auxiliary power supply if the main power supply is abnormal and the auxiliary power supply is normal; the main power supply comprises a fuel cell power generation module and a voltage reduction module, and the fuel cell power generation module is connected with a main power supply input port of the power management module through the voltage reduction module; the auxiliary power supply comprises a power grid and a rectification module, and the power grid is connected with an auxiliary power supply input port of the power management module through the rectification module; and a power output port of the power management module is connected with the auxiliary module. The embodiment of the application supplies power to the battery management module and the auxiliary module by the main power supply and the auxiliary power supply, sets the power supply logic of the main power supply and the auxiliary power supply, alleviates the problem that the failure of a single power supply causes the fuel cell device to stop working, and is beneficial to improving the working stability of the fuel cell device.

[0123] Secondly, the control method of the fuel cell power supply system according to the embodiment of the application will be described with reference to the accompanying drawings.

[0124] Reference Figure 8The embodiment of the present application provides a control method of a fuel cell power supply system. The control method of the fuel cell power supply system in the embodiment of the present application can be applied to a terminal, a server, software running in the terminal or the server, and the like. The terminal can be a tablet computer, a notebook computer, a desktop computer, and the like, but is not limited thereto. The server can be a physical server, a server cluster or a distributed system composed of multiple physical servers, a cloud server providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDNs, and basic cloud computing services such as big data and artificial intelligence platforms, and the like. The control method of the fuel cell power supply system in the embodiment of the present application is applied to the fuel cell power management system described above, and mainly includes the following steps:

[0125] S100: if the main power supply works normally, the power management module and the auxiliary module are powered by the main power supply;

[0126] S200: if the main power supply works abnormally and the auxiliary power supply works normally, the power management module and the auxiliary module are powered by the auxiliary power supply.

[0127] It can be understood that when the main power supply and the auxiliary power supply work normally, the power management module is powered by the main power supply, and the power consumption of the fuel cell device auxiliary module is sourced from the main power supply; when the main power supply cannot work normally and the auxiliary power supply works normally, the power supply source of the power management module is automatically switched to the auxiliary power supply, and the power consumption of the fuel cell device auxiliary module is sourced from the auxiliary power supply; when the main power supply works normally and the auxiliary power supply works normally, the power supply source of the power management module is automatically switched to the main power supply, and the power consumption of the fuel cell device auxiliary module is sourced from the main power supply.

[0128] Further, the power management module comprises a main power supply and an auxiliary power supply overvoltage and undervoltage protection submodule and a main and auxiliary power supply automatic switching submodule;

[0129] When the main power supply and the auxiliary power supply work normally, the voltages of the main power supply input port and the auxiliary power supply input port meet the required range, the main power supply overvoltage and undervoltage protection submodule and the auxiliary power supply overvoltage and undervoltage protection submodule are in the on state, the power of the main power supply can be transmitted to the first input end of the main and auxiliary power supply automatic switching submodule, the power of the auxiliary power supply can be transmitted to the second input end of the main and auxiliary power supply automatic switching submodule, and the power output from the output end of the main and auxiliary power supply automatic switching submodule is sourced from the main power supply;

[0130] When the main power supply cannot normally operate and the auxiliary power supply normally operates, the voltage of the main power supply input port does not meet the required range, the voltage of the auxiliary power supply input port meets the required range, the main power supply over-voltage and under-voltage protection sub-module is in the off state, the auxiliary power supply over-voltage and under-voltage protection sub-module is in the on state, the electric energy of the auxiliary power supply can be transmitted to the first input end of the auxiliary power supply over-voltage and under-voltage protection source automatic switching sub-module, and then the electric energy of the auxiliary power supply can be transmitted to the second input end of the main and auxiliary power supply automatic switching sub-module; the electric energy output by the output end of the main and auxiliary power supply automatic switching sub-module is derived from the auxiliary power supply.

[0131] When the main power supply normally operates and the auxiliary power supply normally operates, the main power supply over-voltage and under-voltage protection sub-module and the auxiliary power supply over-voltage and under-voltage protection sub-module are both in the on state, the electric energy of the main power supply can be transmitted to the first input end of the main and auxiliary power supply automatic switching sub-module, and the electric energy of the auxiliary power supply can be transmitted to the second input end of the main and auxiliary power supply automatic switching sub-module; the electric energy output by the output end of the main and auxiliary power supply automatic switching sub-module is derived from the main power supply.

[0132] Further, the power management module comprises an energy storage component; when the main power supply and the auxiliary power supply cannot normally operate, the main power supply over-voltage and under-voltage protection sub-module and the auxiliary power supply over-voltage and under-voltage protection sub-module are both in the off state, and the output end of the main and auxiliary power supply automatic switching sub-module has no electric energy output; the electric energy of the power output port of the power management module is derived from the energy storage component.

[0133] Further, the fuel cell device controls at least the fuel management module to stop working before the energy storage component runs out of electric energy.

[0134] It can be seen that the contents in the above system embodiments are all applicable to the present method embodiment, the present method embodiment specifically implements the same functions as the above system embodiments, and achieves the same beneficial effects as the above system embodiments.

[0135] With reference to Figure 9 , the present embodiment provides a fuel cell power supply management device, comprising:

[0136] at least one processor 810;

[0137] at least one memory 820 for storing at least one program;

[0138] When the at least one program is executed by the at least one processor 810, the at least one processor 810 implements the control method of the fuel cell power supply system.

[0139] Similarly, the contents in the above method embodiments are all applicable to the present device embodiment, the present device embodiment specifically implements the same functions as the above method embodiments, and achieves the same beneficial effects as the above method embodiments.

[0140] The embodiment of the present application also provides a computer readable storage medium, wherein a processor executable program is stored, and the processor executable program is used for executing the control method of the fuel cell power system when executed by a processor.

[0141] Similarly, the contents in the method embodiments are applicable to the storage medium embodiments, the storage medium embodiments specifically implement the same functions as the method embodiments, and achieve the same beneficial effects as the method embodiments.

[0142] In some alternative embodiments, the functions / operations mentioned in the block diagram can not occur in the order mentioned in the operation diagram. For example, depending on the functions / operations involved, two blocks shown in succession can actually be executed substantially simultaneously with each other, or the blocks can sometimes be executed in reverse order. In addition, the embodiments presented and described in the flowcharts of the present application are provided by way of example, and the purpose is to provide a more comprehensive understanding of the technology. The disclosed method is not limited to the operations and logical flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of a larger operation are independently executed.

[0143] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features can be integrated in a single physical device and / or software module, or one or more functions and / or features can be implemented in separate physical devices or software modules. It can also be understood that a detailed discussion of the actual implementation of each module is unnecessary for an understanding of the present application. Rather, given the properties, functions and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the module will be within the routine skill of the engineer, given the benefit of this disclosure. Thus, a person of ordinary skill in the art, using the ordinary skill, can implement the present application as set forth in the claims without undue experimentation, given the benefit of this disclosure. It can also be understood that the disclosed specific concepts are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the appended claims and their equivalents.

[0144] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the present application that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of programs for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0145] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a list of ordered steps for implementing logical functions, and can be embodied in any computer readable medium for use by a program execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can take programs from a program execution system, device or apparatus and execute them) or in conjunction with these program execution systems, devices or apparatus. For the purpose of this specification, "computer readable medium" can be any device that can contain, store, communicate, propagate or transport programs for use by program execution systems, devices or apparatus or in conjunction with these program execution systems, devices or apparatus.

[0146] More specific examples (non-exhaustive list) of the computer readable medium include the following: an electrical connection having one or more wires (electrical devices), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optical scanning of the paper or other medium, followed by editing, interpreting or otherwise processing, if necessary, in other suitable ways, to be electronically obtained and then stored in the computer memory.

[0147] It should be understood that various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable

[0148] In the above description of the present application, reference has been made to descriptive terms such as "one embodiment," "another embodiment," "certain embodiments," or the like, which is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The illustrative appearances of the above-described terms in various places in the specification are not intended to exclude that the terms so described can be used, along with other terms that were described as being synonymous with them, in any suitable embodiment or example of the application. Furthermore, descriptions of a particular feature, structure, material, or characteristic in relation to an embodiment or example does not mean that it is a required feature, structure, material, or characteristic to that embodiment or example.

[0149] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.

[0150] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are included in the scope of the present application defined by the claims.

Claims

1. A fuel cell power management system, characterized by, The system comprises a main power supply, a secondary power supply, an auxiliary module and a power management module; The power management module is used for: If the main power supply works normally, the main power supply supplies power to the power management module and the auxiliary module; If the main power supply works abnormally and the secondary power supply works normally, the secondary power supply supplies power to the power management module and the auxiliary module; The main power supply comprises a fuel cell power generation module and a voltage reduction module, and the fuel cell power generation module is connected with the main power supply input port of the power management module through the voltage reduction module; the secondary power supply comprises a power grid and a rectifier module, and the power grid is connected with the secondary power supply input port of the power management module through the rectifier module; the power supply output port of the power management module is connected with the auxiliary module; The power management module comprises a main-secondary power supply automatic switching sub-module and an energy storage unit, the charging port of the energy storage unit is connected with the output end of the main-secondary power supply automatic switching sub-module, and the power outlet of the energy storage unit is connected with the power supply output port; the energy storage unit is used for providing electric energy for the auxiliary module when there is no electric energy output at the output end of the main-secondary power supply automatic switching sub-module; The first time length during which the energy storage unit can provide electric energy is greater than or equal to the second time length required for the auxiliary module to close the gas supply.

2. The fuel cell power management system of claim 1, wherein The main power supply input port is connected with the first input end of the main-secondary power supply automatic switching sub-module, the secondary power supply input port is connected with the second input end of the main-secondary power supply automatic switching sub-module, and the output end of the main-secondary power supply automatic switching sub-module is connected with the power supply output port; the main-secondary power supply automatic switching sub-module is used for outputting electric energy from the first input end at the output end if there is power supply input at the first input end and the second input end; If there is no power supply input at the first input end and there is power supply input at the second input end, the output end outputs electric energy from the second input end.

3. The fuel cell power management system of claim 2, wherein, The main-secondary power supply automatic switching sub-module comprises a main-secondary power supply automatic switching circuit, the main-secondary power supply automatic switching circuit comprises a power supply switch chip, the main power supply input port is connected with the drain electrode of a first switch device, the source electrode of the first switch device is connected with the power supply output port, the source electrode of a second switch device, the sixth port of the power supply switch chip, the gate electrode of the first switch device is connected with the first port of the power supply switch chip; the secondary power supply input port is connected with the drain electrode of the second switch device and the seventh port of the power supply switch chip, the source electrode of the second switch device is connected with the first port of the power supply switch chip through a first resistor, the source electrode of the second switch device is connected with the power supply output port and the sixth port of the power supply switch chip, and the gate electrode of the second switch device is connected with the eighth port of the power supply switch chip.

4. The fuel cell power management system of claim 3, wherein, The main and auxiliary power supply automatic switching circuit further comprises: a photocoupler, a first port of the power supply switching chip is connected to a gate of a third switching device, a source of the third switching device is connected to the power supply output port, a drain of the third switching device is connected to a first end of the photocoupler, a second end of the photocoupler is located on the same side as the first end of the photocoupler, the second end of the photocoupler is grounded, a fourth end of the photocoupler is connected to a signal output end, the fourth end of the photocoupler is connected to a power supply through a second resistor, a third end of the photocoupler is grounded; the fuel cell power supply management system is used for: determining whether the main power supply or the auxiliary power supply is currently powered according to a level of the signal output end.

5. The fuel cell power management system of claim 1, wherein, The first time length is t2, and the second time length is t1; wherein t2≥a*t1, 1.2≤a≤2.

5.

6. The fuel cell power management system of claim 2, wherein, The power management module comprises: a main power supply over-voltage and under-voltage protection submodule and an auxiliary power supply over-voltage and under-voltage protection submodule. The main power supply input port is connected to a first input end of the main and auxiliary power supply automatic switching submodule through the main power supply over-voltage and under-voltage protection submodule, and the auxiliary power supply input port is connected to a second input end of the main and auxiliary power supply automatic switching submodule through the auxiliary power supply over-voltage and under-voltage protection submodule. If the voltage of the main power supply input port does not belong to a preset voltage range, the main power supply over-voltage and under-voltage protection submodule is in an open state; if the voltage of the auxiliary power supply input port does not belong to the preset voltage range, the auxiliary power supply over-voltage and under-voltage protection submodule is in the open state.

7. The fuel cell power management system of claim 6, wherein, The main power supply over-voltage and under-voltage protection submodule comprises: a voltage monitoring chip. The main power supply input port is connected to a first port of the voltage monitoring chip, the first port of the voltage monitoring chip is connected to a second port of the voltage monitoring chip through a third resistor, the second port of the voltage monitoring chip is connected to a third port of the voltage monitoring chip through a fourth resistor, the third port of the voltage monitoring chip is connected to a fourth port of the voltage monitoring chip through a fifth resistor, and the fourth port of the voltage monitoring chip is grounded. The main power supply input port is connected to a drain of a fourth switching device, a source of the fourth switching device is connected to a source of a fifth switching device, a drain of the fifth switching device is connected to the first input end of the main and auxiliary power supply automatic switching submodule, a gate of the fourth switching device is connected to a gate of the fifth switching device, the gate of the fourth switching device is connected to an eighth port of the voltage monitoring chip, and a seventh port of the voltage monitoring chip is connected to the first input end of the main and auxiliary power supply automatic switching submodule.

8. A control method of a fuel cell power supply system, characterized by, The method is applied to the fuel cell power supply management system of claim 1, and the method comprises: if the main power supply works normally, supplying power to the power management module and the auxiliary module by the main power supply; and if the main power supply works abnormally and the auxiliary power supply works normally, supplying power to the power management module and the auxiliary module by the auxiliary power supply.

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