Fuel cell power management system and control method

Abstract

The invention discloses a fuel cell power supply management system and a control method. The system 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 for supplying power to the power supply management module and the auxiliary module by the main power supply if the main power supply works normally; if the main power supply works abnormally and the auxiliary power supply works normally, the auxiliary power supply supplies power to the power supply 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 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, and the power grid is connected with the auxiliary power supply input port of the power supply management module through the rectification module. The working stability of the fuel cell device is improved. The invention can be widely applied to the technical field of fuel cells.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell power management system and a control method. Background Art

[0002] A fuel cell is an electrochemical device that can directly convert chemical energy stored in fuel and oxidant into electrical energy. It is equipped with an auxiliary system on the periphery. The auxiliary system 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. The stability of its power supply is one of the important foundations for the normal operation of the fuel cell device. In the related technology, power failures often occur, causing the fuel cell device to shut down, affecting the working stability of the fuel cell device. Summary of the invention

[0003] The purpose of the present invention is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] Therefore, an object of the present invention is to provide a fuel cell power management system and control method with stable operation.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the embodiments of the present invention include the following aspects:

[0006] On the one hand, an embodiment of the present invention provides a fuel cell power management system, including: a main power supply, a secondary power supply, an auxiliary module and a power management module; the power management module is used to: 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 includes a fuel cell power generation module and a step-down module, and the fuel cell power generation module is connected to the main power input port of the power management module through the step-down module; the secondary power supply includes a power grid and a rectifier module, and the power grid is connected to the secondary power input port of the power management module through the rectifier module; the power output port of the power management module is connected to the auxiliary module. The embodiment of the present application supplies power to the battery management module and the auxiliary module through the main power supply and the secondary power supply, and sets the power supply logic of the main power supply and the secondary power supply, which alleviates the problem of the fuel cell device shutting down due to a single power failure, 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 embodiment of the present invention may also have the following additional technical features:

[0008] Furthermore, in the fuel cell power management system of the embodiment of the present invention, the power management module includes: a main-subsidiary power automatic switching submodule, the main power input port is connected to the first input end of the main-subsidiary power automatic switching submodule, the subsidiary power input port is connected to the second input end of the main-subsidiary power automatic switching submodule, and the output end of the main-subsidiary power automatic switching submodule is connected to the power output port; the main-subsidiary power automatic switching submodule is used for: if the first input end and the second input end both have power input, the output end outputs the electric energy from the first input end; if the first input end has no power input and the second input end has power input, the output end outputs the electric energy from the second input end.

[0009] Further, in one embodiment of the present invention, the main-sub power automatic switching submodule includes: a main-sub power automatic switching circuit, the main-sub power automatic switching circuit includes a power switch chip, the main power input port is connected to the drain of the first switch device, the source of the first switch device is connected to the power output port, the source of the second switch device, and the sixth port of the power switch chip, and the gate of the first switch device is connected to the first port of the power switch chip; the secondary power input port is connected to the drain of the second switch device and the seventh port of the power switch chip, the source of the second switch device is connected to the first port of the power switch chip through a first resistor, the source of the second switch device is connected to the power output port and the sixth port of the power switch chip, and the gate of the second switch device is connected to the eighth port of the power switch chip.

[0010] Furthermore, in one embodiment of the present invention, the main-sub power automatic switching circuit also includes: an optocoupler, the first port of the power switch chip is connected to the gate of the third switching device, the source of the third switching device is connected to the power output port, and the drain of the third switching device is connected to the first end of the optocoupler; the 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, the fourth end of the optocoupler is connected to the signal output end, the fourth end of the optocoupler is connected to the power supply through the second resistor, and the third end of the optocoupler is grounded; the fuel cell power management system is used to: determine whether the main power supply or the auxiliary power supply is currently powered according to the level of the signal output end.

[0011] Furthermore, in one embodiment of the present invention, the power management module includes: an energy storage unit, the charging port of the energy storage unit is connected to the output end of the main-sub power automatic switching submodule, and the power output port of the energy storage unit is connected to the power output port; the energy storage unit is used to: provide power to the auxiliary module when there is no power output at the output end of the main-sub power automatic switching submodule.

[0012] Furthermore, in one embodiment of the present invention, the first time duration that the energy storage unit can provide electric energy is greater than or equal to the second time duration required for the auxiliary module to shut off the gas supply.

[0013] Further, in an embodiment of the present invention, 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 invention, the power management module includes: a main power supply over-voltage and under-voltage protection submodule and a secondary power supply over-voltage and under-voltage protection submodule;

[0015] The main power input port is connected to the first input end of the main-sub power automatic switching submodule through the main power over-under voltage protection submodule, and the auxiliary power input port is connected to the second input end of the main-sub power automatic switching submodule through the auxiliary power over-under voltage protection submodule;

[0016] If the voltage of the main power input port does not fall within the preset voltage range, the main power over- and under-voltage protection submodule is in a disconnected state; if the voltage of the auxiliary power input port does not fall within the preset voltage range, the auxiliary power over- and under-voltage protection submodule is in a disconnected state.

[0017] Further, in one embodiment of the present invention, the main power supply over-voltage and under-voltage protection submodule includes: a voltage monitoring chip;

[0018] The main power input port is connected to the first port of the voltage monitoring chip, the first port of the voltage monitoring chip is connected to the second port of the voltage monitoring chip through a third resistor, the second port of the voltage monitoring chip is connected to the third port of the voltage monitoring chip through a fourth resistor, the third port of the voltage monitoring chip is connected to 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 to the drain of the fourth switching device, the source of the fourth switching device is connected to the source of the fifth switching device, the drain of the fifth switching device is connected to the first input end of the main-sub power automatic switching submodule, the gate of the fourth switching device is connected to the gate of the fifth switching device, the gate of the fourth switching device is connected to the eighth port of the voltage monitoring chip, and the seventh port of the voltage monitoring chip is connected to the first input end of the main-sub power automatic switching submodule.

[0020] On the other hand, an embodiment of the present invention provides a control method for a fuel cell power system, which is applied to the above-mentioned fuel cell power management system. The method includes:

[0021] 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 auxiliary power supply works normally, the auxiliary power supply supplies power to the power management module and the auxiliary module.

[0022] On the other hand, an embodiment of the present invention provides a fuel cell power 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 above-mentioned control method of the fuel cell power system.

[0026] On the other hand, an embodiment of the present invention provides a storage medium in which a program executable by a processor is stored. When the program executable by the processor is executed by the processor, it is used to implement the control method of the fuel cell power system mentioned above.

[0027] The system provided by the embodiment of the present invention includes: a main power supply, a secondary power supply, an auxiliary module and a power management module; the power management module is used to: 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 includes a fuel cell power generation module and a step-down module, and the fuel cell power generation module is connected to the main power input port of the power management module through the step-down module; the secondary power supply includes a power grid and a rectifier module, and the power grid is connected to the secondary power input port of the power management module through the rectifier module; the power output port of the power management module is connected to the auxiliary module. The embodiment of the present application supplies power to the battery management module and the auxiliary module through the main power supply and the secondary power supply, and sets the power supply logic of the main power supply and the secondary power supply, which alleviates the problem of the fuel cell device shutting down due to a single power failure, and is conducive to improving the working stability of the fuel cell device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1A schematic diagram of the structure of an embodiment of a fuel cell power management system provided by the present invention;

[0030] Figure 2 A schematic diagram of the structure of an embodiment of a power management module provided by the present invention;

[0031] Figure 3 An electrical schematic diagram of an embodiment of a main-slave power automatic switching submodule provided by the present invention;

[0032] Figure 4 An electrical schematic diagram of an embodiment of a main power supply over-voltage and under-voltage protection submodule provided by the present invention;

[0033] Figure 5 An electrical schematic diagram of an embodiment of a secondary power supply over- and under-voltage protection submodule provided by the present invention;

[0034] Figure 6 An electrical schematic diagram of an embodiment of voltage detection provided by the present invention;

[0035] Figure 7 An electrical schematic diagram of another embodiment of voltage detection provided by the present invention;

[0036] Figure 8 A flow chart of an embodiment of a control method for a fuel cell power system provided by the present invention;

[0037] Fig. 9 A schematic structural diagram of an embodiment of a fuel cell power management device provided by the present invention. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided 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 embodiment 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 its peripheral auxiliary systems include: gas management system, water treatment system, power management system, main control system, auxiliary test system, etc. The auxiliary system can provide the most suitable reaction conditions for the gas and ensure the safety and reliability of the fuel cell device.

[0040] Among them, the power management system is mainly responsible for managing the power supply of various auxiliary systems. The stability of its power supply is one of the important foundations for the normal operation of the fuel cell device. At present, the fuel cell power management system is usually powered by a single power supply. If the power supply fails, the fuel cell device will shut down. It will take a long time to restart it, which is not conducive to the long-term stable and efficient power generation of the fuel cell device.

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

[0042] Figure 1 This is a schematic diagram of the structure of a fuel cell power management system according to an embodiment of the present invention. The system specifically includes:

[0043] Main power supply, secondary power supply, auxiliary module and power management module;

[0044] The power management module is used to:

[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 auxiliary power supply works normally, the auxiliary 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. The fuel cell power generation module is connected to the main power input port of the power management module through the step-down module; the auxiliary power supply includes a power grid and a rectifier module. The power grid is connected to the auxiliary power input port of the power management module through the rectifier module; the power output port of the power management module is connected to the auxiliary module.

[0048] The embodiment of the present application performs a logical judgment on the working status of the main power supply and the auxiliary power supply, and decides to supply power through the main power supply or the auxiliary power supply, thereby realizing dual power supply and improving power supply reliability. Specifically, if the main power supply is working normally, there is no need to consider the working status of the auxiliary power supply, and the power management module and the auxiliary module are powered by the main power supply; when the main power supply is working abnormally and the auxiliary power supply is working normally, the power management module and the auxiliary module are powered by the auxiliary power supply. The step-down module is used to step down the direct current generated by the battery stack; the rectifier module is used to rectify the alternating current output from the power grid into low-voltage direct current; the auxiliary module is used to provide management of fuel, water vapor and other aspects for the fuel cell device and overall control of the fuel cell device, and the auxiliary module includes a water treatment module, a gas management module, and a fuel cell device main control module.

[0049] In the fuel cell power management system of the present invention, a main power supply and a secondary power supply are used to power each auxiliary module, wherein the main power supply is derived from the fuel cell power generation module, and the secondary power supply is derived from the power grid, and the two power supply modes of the main power supply and the secondary power supply can be switched with each other, thereby avoiding the problem of the fuel cell device shutting down due to a single power supply failure, and ensuring the long-term stable and efficient power generation of the fuel cell device.

[0050] Optionally, in the fuel cell power management system in the embodiment of the present invention, the power management module includes: a main-sub-power automatic switching submodule, the main power input port is connected to the first input end of the main-sub-power automatic switching submodule, the sub-power input port is connected to the second input end of the main-sub-power automatic switching submodule, and the output end of the main-sub-power automatic switching submodule is connected to the power output port; the main-sub-power automatic switching submodule is used for: if both the first input end and the second input end have power input, the output end outputs the electric energy from the first input end; if the first input end has no power input and the second input end has power input, the output end outputs the electric energy from the second input end.

[0051] In some possible implementations, the main-subsidiary power automatic switching submodule is used to receive power from the main power supply and the secondary power supply, and switch to power supply by the main power supply or by the secondary power supply according to the working conditions of the two power supplies.

[0052] Optionally, in the fuel cell power management system in the embodiment of the present invention, the main-sub power automatic switching submodule includes: a main-sub power automatic switching circuit, the main-sub power automatic switching circuit includes a power switch chip, the main power input port is connected to the drain of the first switch device, the source of the first switch device is connected to the power output port, the source of the second switch device, and the sixth port of the power switch chip, and the gate of the first switch device is connected to the first port of the power switch chip; the secondary power input port is connected to the drain of the second switch device and the seventh port of the power switch chip, the source of the second switch device is connected to the first port of the power switch chip through the first resistor, the source of the second switch device is connected to the power output port and the sixth port of the power switch chip, and the gate of the second switch device is connected to the eighth port of the power switch chip.

[0053] In some possible implementations, the switching between the main power supply and the auxiliary power supply can be achieved by an automatic switching circuit between the main power supply and the auxiliary power supply. The selection of the power switch chip can be set according to actual needs, and this application does not make any specific restrictions. For example, the power switch chip can be a TPS2121 chip.

[0054] Optionally, in the fuel cell power management system in the embodiment of the present invention, the main and auxiliary power automatic switching circuit also includes: an optocoupler, the first port of the power switch chip is connected to the gate of the third switching device, the source of the third switching device is connected to the power output port, and the drain of the third switching device is connected to the first end of the optocoupler; the 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, the fourth end of the optocoupler is connected to the signal output end, the fourth end of the optocoupler is connected to the power supply through the second resistor, and the third end of the optocoupler is grounded; the fuel cell power management system is used to: determine whether the main power supply or the auxiliary power supply is currently powered according to the level of the signal output end.

[0055] In some possible implementations, the embodiment of the present application uses an optical coupler to lead out the level of the signal output end to determine the current power supply end. 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 secondary power supply.

[0056] Optionally, in the fuel cell power management system in the embodiment of the present invention, the power management module includes: an energy storage unit, the charging port of the energy storage unit is connected to the output end of the main-sub power automatic switching submodule, and the power output port of the energy storage unit is connected to the power output port; the energy storage unit is used to: provide power to the auxiliary module when there is no power output at the output end of the main-sub power automatic switching submodule.

[0057] In some possible implementations, the power outlet of the energy storage unit is connected to the power outlet via the output control submodule, and the output end of the main-sub power automatic switching submodule is connected to the power outlet via the output control submodule. If the main-sub power automatic switching submodule has no power output, the energy storage component (i.e., the energy storage unit in the embodiment of the present application) is used to power the auxiliary module for a short time. Specifically, the main-sub power automatic switching submodule has no power output, which may be due to a failure of the main-sub power automatic switching submodule, or a failure / failure of the main power and the auxiliary power to operate normally.

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

[0059] Optionally, in the fuel cell power management system in the embodiment of the present invention, 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 embodiments, the second time includes the time when the power management module detects the input voltage of the first input terminal and the second input terminal (or the time when the output voltage of the output terminal is output), the time when the power management module sends the input voltage information to the main control module of the fuel cell device and the time when the main control module processes the voltage information, the 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 the auxiliary module of the fuel cell device performs the operation according to the instruction.

[0061] Optionally, in the fuel cell power management system in the embodiment of the present invention, the power management module includes: a main power supply over-voltage and under-voltage protection submodule and a secondary power supply over-voltage and under-voltage protection submodule;

[0062] The main power input port is connected to the first input end of the main-sub power automatic switching submodule through the main power over-under voltage protection submodule, and the auxiliary power input port is connected to the second input end of the main-sub power automatic switching submodule through the auxiliary power over-under voltage protection submodule;

[0063] If the voltage at the main power input port does not fall within the preset voltage range, the main power over-voltage and under-voltage protection submodule is in the disconnected state; if the voltage at the auxiliary power input port does not fall within the preset voltage range, the auxiliary power over-voltage and under-voltage protection submodule is in the disconnected state.

[0064] In some possible implementations, the preset voltage range can be set according to the power requirements of the power management module and the auxiliary module. The main power supply over-voltage and under-voltage protection submodule and the auxiliary power supply over-voltage and under-voltage protection submodule are used to determine whether the voltage of the main power supply / auxiliary power supply output power meets the subsequent power supply requirements. If not, the power supply is cut off to provide power supply reliability.

[0065] Optionally, in the fuel cell power management system in the embodiment of the present invention, the main power supply over-voltage and under-voltage protection submodule includes: a voltage monitoring chip;

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

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

[0068] In some possible implementations, the secondary power supply over-voltage and under-voltage protection submodule has the same circuit structure as the main power supply over-voltage and under-voltage protection submodule. The voltage monitoring chip in the embodiment of the present application can be a MAX6497 chip, and those skilled in the art can also select a voltage monitoring chip with similar functions according to actual needs, and the present application does not make specific restrictions.

[0069] The following is a detailed description of a fuel cell power management system proposed in the present application with a specific embodiment. Specifically, refer to Figure 1 As shown, 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;

[0070] The main power supply 10 includes a fuel cell power generation module and a DC-DC step-down module, and the auxiliary power supply 11 includes a power grid and an AC-DC rectifier module; the main power supply circuit is that the fuel cell power generation module is electrically connected to the main power input port of the power management module through the DC-DC step-down module, and the auxiliary power supply circuit is that the power grid is electrically connected to the auxiliary power input port of the power management module through the AC-DC rectifier module; the power output port of the power management module is electrically connected to the auxiliary module of the fuel cell device;

[0071] When the main power supply operates normally, the power management module is powered by the main power supply, otherwise it automatically switches to being powered by the auxiliary power supply. Specifically, normal operation is defined as (i.e., working normally in the embodiment of the present application): the main (auxiliary) power supply can provide power, and the voltage value and current value are within the specified range.

[0072] In the fuel cell power management system of the present invention, a main power supply and a secondary power supply are used to power the auxiliary modules of each fuel cell device, wherein the main power supply is derived from the fuel cell power generation module, and the secondary power supply is derived from the power grid, and the two power supply modes of the main power supply and the secondary power supply can be switched with each other, thereby avoiding the problem of the fuel cell device shutting down due to a single power supply failure, and ensuring the long-term stable and efficient power generation of the fuel cell device.

[0073] Specifically, when the main power supply is operating normally, the power management module is powered by the main power supply, thereby transmitting the power of the main power supply to the auxiliary modules; when the main power supply cannot operate normally and the auxiliary power supply is operating normally, the system automatically switches to the auxiliary power supply to power the power management module, and the power of the main power supply cannot be transmitted to the auxiliary modules through the power management module; when the main power supply resumes normal operation, the system automatically switches back to the main power supply to power the power management module.

[0074] Among them, the function of the fuel cell power generation module is to convert the chemical energy of the fuel into electrical energy through high-temperature electrochemical reactions; the function of the DC-DC step-down module is to step down and convert the direct current generated by the battery stack and then supply power to the power management module; the function of the AC-DC rectifier module is to rectify the alternating current output from the power grid into low-voltage direct current and supply power to the power management module; the function of the fuel cell device auxiliary module is to provide the fuel cell device with management of fuel, water vapor and other aspects and overall control of the fuel cell device.

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

[0076] Furthermore, the fuel cell power management system also includes a UPS module 4, and the power grid is electrically connected to the AC-DC rectifier module through the UPS. The function of the UPS module (uninterruptible power supply) is to rectify the 380VAC alternating current of the power grid into direct current, transmit it to the internal battery after filtering and voltage stabilization, and then invert the direct current of the battery into 220VAC alternating current output.

[0077] Further, refer to Figure 2 As shown, the power management module includes a main-sub power automatic switching submodule, which has a first input terminal, a second input terminal and an output terminal; the main power input port is electrically connected to the first input terminal, the sub power input port is electrically connected to the second input terminal, and the output terminal is electrically connected to the power output port; when the main power supply operates normally, the electric energy output by the output terminal comes from the main power supply, otherwise the electric energy output by the output terminal comes from the sub power supply.

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

[0079] Further, refer to Figure 3 As shown, the main-sub power automatic switching submodule has a main-sub power automatic switching circuit, which includes: a chip U3 (i.e., a power switch chip in the embodiment of the present application), a switch device Q5 (i.e., a first switch device), a switch device Q6 (i.e., a second switch device), and a resistor R9 (i.e., a first resistor);

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

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

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

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

[0084] In other embodiments, when the main power supply supplies power to the first input terminal VIN3 and the auxiliary power supply cannot supply power to the second input terminal VIN4, the drain-source diode of the switching device Q5 is turned on, and the 6th pin of the chip U3 is pulled up, and at the same time, the 8th pin controls the closing of the switching device Q6, and then the voltage of the 1st pin of the chip U3 is pulled down and controls the opening of the switching device Q5; at this time, the electric energy of the output terminal VOUT3 comes from the main power supply of the first input terminal VIN3, and since the on-resistance of the switching device Q5 is small, the voltage of the output terminal VOUT3 of the main-auxiliary power automatic switching submodule is approximately equal to the voltage value of the main power supply.

[0085] Furthermore, the main and auxiliary power automatic switching circuit also includes: a switch device Q7 (i.e., a third switch device), an optical coupler U4, and a resistor R10 (i.e., a second resistor);

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

[0087] Pin 2 of the optocoupler U4 (i.e., the second end of the optocoupler in the embodiment of the present application) is located on the same side as pin 1 and pin 2 is grounded, pin 4 of the optocoupler U4 (i.e., the fourth end of the optocoupler in the embodiment of the present application) and pin 3 (i.e., the third end of the optocoupler in the embodiment of the present application) are located on the same side, pin 4 of the optocoupler U4 is respectively connected to one end of the resistor R10 and the signal output terminal 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 present application), and pin 3 of the optocoupler U4 is grounded.

[0088] In some embodiments, when the main power supply supplies power to the first input terminal VIN3 and the auxiliary power supply supplies power to the second input terminal VIN4, the voltage of pin 1 of the chip U3 will be pulled down and control the opening of the switching device Q7. At this time, pins 1 and 2 of the optocoupler U4 are turned on, and the output signal IO of pin 4 is pulled down from the high level VCC to the low level GND. The power management module receives the low level signal IO and determines that the main power supply is currently used.

[0089] In other embodiments, when the main power supply cannot supply power to the first input terminal VIN3 and the auxiliary power supply supplies power to the second input terminal VIN4, the voltage of pin 1 of the chip U3 will be pulled up and control the switching device Q7 to be turned off. At this time, pins 1 and 2 of the optocoupler U4 are not conducting, and the output signal IO of pin 4 is pulled up to VCC by the resistor R10. The power management module receives the high-level signal IO and determines that the auxiliary power supply is currently used.

[0090] Furthermore, the power management module also includes 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 to the output end of the main-sub power automatic switching submodule, and the power output port of the energy storage component is electrically connected to the power output port; when the main-sub power automatic switching submodule has no power output, the energy storage component can short-term power the fuel cell device auxiliary module.

[0091] Furthermore, the auxiliary module of the fuel cell device includes a gas management module, and the power supply time of the energy storage component is at least sufficient for the gas management module to execute the operation of shutting off the gas supply.

[0092] It can be understood that the energy storage component can store electric energy from the output end of the main-sub power automatic switching submodule; when there is no electric energy output from the output end of the main-sub power automatic switching submodule (the reasons may be: both the main power and the sub power cannot operate normally, or the main-sub power automatic switching submodule fails, etc.), the fuel cell device needs to be shut down urgently, and the auxiliary module of the fuel cell device needs to be shut down or enter standby mode, especially requiring the gas management module to shut down the gas supply to avoid dangers such as gas leakage. When the main and sub power supplies cannot power the auxiliary module, the energy storage component can power it for a short time, thereby ensuring the gas management module to execute the gas supply shutdown, and other auxiliary modules to perform related actions. The required electricity.

[0093] Furthermore, the power management module also includes a power management module control chip, and the control chip is electrically connected to the output end of the main and auxiliary power automatic switching submodule and the power outlet of the energy storage component respectively;

[0094] When the main-sub power automatic switching submodule outputs power normally, the control chip is powered by one of the main power supply or the auxiliary power supply. When the main-sub power automatic switching submodule has no power output, the control chip is powered by the energy storage component.

[0095] Furthermore, the time from when the fuel cell device detects that the main-sub power automatic switching submodule cannot output electric energy to when the fuel cell device executes the response action is t1, and the power supply duration of the energy storage component is t2, then t2≥t1; preferably t2>t1; preferably t2>a*t1, where 1.2≤a≤2.5.

[0096] Specifically, if the voltages of the main power input port and the auxiliary power input port do not meet the requirements, the main-auxiliary power automatic switching submodule cannot receive electrical energy from the main power supply and the auxiliary power supply, and the fuel cell device needs to respond urgently. The power supply time t2 of the energy storage component and the response time t1 of the fuel cell device must meet the above conditions to ensure that the fuel cell device can safely and stably enter the shutdown or standby state.

[0097] The detection point used by the fuel cell device when detecting that the main-sub power automatic switching submodule cannot output electric energy may be the voltage of the first and second input terminals of the main-sub power automatic switching submodule, or the voltage of its output terminal.

[0098] Furthermore, t1 includes the sum of the following times: the time when the power management module detects the input voltage of the first input terminal and the second input terminal (or the time when the output voltage of the output terminal is output), the time when the power management module sends the input voltage information to the main control module of the fuel cell device and the time when the main control module processes the voltage information, the 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 the auxiliary module of the fuel cell device performs the operation according to the instruction.

[0099] Furthermore, the power management module also includes a main power supply over-voltage and under-voltage protection submodule and a secondary power supply over-voltage and under-voltage protection submodule;

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

[0101] When the voltage at the main power input port does not meet the range requirements, the main power over- and under-voltage protection submodule is in a disconnected state, and the power of the main power supply cannot be supplied to the main-sub power automatic switching submodule; when the voltage at the sub power input port does not meet the range requirements, the sub power over- and under-voltage protection submodule is in a disconnected state, and the power of the sub power supply cannot be supplied to the main-sub power automatic switching submodule.

[0102] It can be understood that by setting a main (auxiliary) power supply over- and under-voltage protection submodule between the main (auxiliary) power supply input port and the main-auxiliary power supply automatic switching submodule, it is possible to automatically connect and disconnect the electrical connection between the main (auxiliary) power supply and the main-auxiliary power supply automatic switching submodule according to the voltage of the electric energy output by the main (auxiliary) power supply.

[0103] Further, refer to Figure 4 The main power supply over-voltage and under-voltage protection submodule shown Figure 5The secondary power supply over-voltage and under-voltage protection submodule shown, the main power supply over-voltage and under-voltage protection submodule has a main power supply over-voltage and under-voltage protection circuit, which includes: voltage monitoring chip U1 (i.e., the voltage monitoring chip in the embodiment of the present application), switch device Q1 (i.e., the fourth switch device in the embodiment of the present application), switch device Q2 (i.e., the fifth switch device in the embodiment of the present application), resistor R1 (i.e., the third resistor in the embodiment of the present application), resistor R2 (i.e., the fourth resistor in the embodiment of the present application), resistor R3 (i.e., the fifth resistor in the embodiment of the present application); the secondary power supply over-voltage and under-voltage protection submodule has a secondary power supply over-voltage and under-voltage protection circuit, which includes: voltage monitoring chip U2, switch device Q3, switch device Q4, resistor R5, resistor R6, resistor R7. The secondary power supply over-voltage and under-voltage protection submodule has the same circuit structure as the main power supply over-voltage and under-voltage protection submodule.

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

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

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

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

[0108] It should be noted that the nth pin of the above-mentioned voltage monitoring chip is the nth port of the voltage monitoring chip in the embodiment of the present 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 used as an example for explanation. The 2nd pin UV function of the voltage monitoring chip U1 is the undervoltage comparator input, and the 3rd pin OV function is the overvoltage comparator input; the over-voltage and under-voltage protection value setting resistor of the voltage monitoring chip U1 is formed by resistors R1, R2, and R3, and the resistance value calculation formula is as follows:

[0110] V OSis the maximum offset voltage of the UV pin comparator, I LEAK is the maximum leakage current of the UV pin comparator, V OS and I LEAK Determined by chip U1 parameters;

[0111] VL1 is the undervoltage protection threshold voltage;

[0112] VH1 is the overvoltage protection threshold voltage;

[0113] For example, the V OS 3mV, I LEAK is 10nA, the undervoltage protection threshold voltage VL1 is set to 3.5V, and the overvoltage protection threshold voltage VH1 is set to 18V; according to the above formula, the resistance value of resistor R1 is 1.8MΩ, the resistance value of resistor R2 is 241.7kΩ, and the resistance value of resistor R3 is 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 the switch devices Q1 and Q2 to open, and obtain the main power output voltage VOUT1. Since the on-resistance of the switch devices Q1 and 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 the closing of the switch device Q1 and the switch device Q2, that is, the main power supply is disconnected from the main power supply to the main and auxiliary power supply automatic switching submodule;

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

[0117] In some embodiments, reference Figure 6 The voltage detection circuit shown in FIG. 1 detects the voltage of the circuit output terminal VOUT1 through the resistor R11 and the resistor R12. Figure 7 The voltage detection circuit shown detects the voltage of the circuit output terminal VOUT2 through the resistor R13 and the resistor R14.

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

[0119] It is understandable that the function of the fuse F1 (F2) is to provide overcurrent protection for the main (auxiliary) power input port VIN1 (VIN2). When the current exceeds the protection value of the fuse, the fuse will blow.

[0120] Furthermore, the power management module also includes an output control submodule, and the output end of the main and auxiliary power automatic switching submodule is electrically connected to the power output port through the output control submodule. Furthermore, the power output port of the energy storage component is electrically connected to the power output port through the output control submodule.

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

[0122] The system provided by the embodiment of the present application includes: a main power supply, a secondary power supply, an auxiliary module and a power management module; the power management module is used to: 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 includes a fuel cell power generation module and a step-down module, and the fuel cell power generation module is connected to the main power input port of the power management module through the step-down module; the secondary power supply includes a power grid and a rectifier module, and the power grid is connected to the secondary power input port of the power management module through the rectifier module; the power output port of the power management module is connected to the auxiliary module. The embodiment of the present application supplies power to the battery management module and the auxiliary module through the main power supply and the secondary power supply, and sets the power supply logic of the main power supply and the secondary power supply, which alleviates the problem of the fuel cell device shutting down due to a single power failure, and is conducive to improving the working stability of the fuel cell device.

[0123] Next, a control method of a fuel cell power system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0124] Reference Figure 8In an embodiment of the present invention, a control method for a fuel cell power system is provided. The control method for a fuel cell power system in the embodiment of the present invention can be applied to a terminal, a server, or software running in a terminal or a server. The terminal can be a tablet computer, a laptop computer, a desktop computer, etc., but is not limited thereto. The server can be an independent physical server, or a server cluster or a distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The control method for a fuel cell power system in an embodiment of the present invention 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 main power supply supplies power to the power management module and the auxiliary module;

[0126] S200: If the main power supply operates abnormally and the secondary power supply operates normally, the secondary power supply supplies power to the power management module and the auxiliary module.

[0127] It can be understood that when both the main power supply and the auxiliary power supply are operating normally, the power management module is powered by the main power supply, and the power used by the auxiliary module of the fuel cell device comes from the main power supply; when the main power supply cannot operate normally and the auxiliary power supply operates normally, the power supply source of the power management module is automatically switched to the auxiliary power supply, and the power used by the auxiliary module of the fuel cell device comes from the auxiliary power supply; when the main power supply resumes normal operation and the auxiliary power supply operates normally, the power supply source of the power management module is automatically switched to the main power supply, and the power used by the auxiliary module of the fuel cell device comes from the main power supply.

[0128] Furthermore, the power management module includes a main and auxiliary power supply over-voltage and under-voltage protection submodule and a main and auxiliary power supply automatic switching submodule;

[0129] When both the main and auxiliary power supplies are operating normally, the voltages at the main power input port and the auxiliary power input port meet the required range, the main power over-voltage and under-voltage protection submodule and the auxiliary power over-voltage and under-voltage protection submodule 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-auxiliary power automatic switching submodule, and the electric energy of the auxiliary power supply can be transmitted to the second input end of the main-auxiliary power automatic switching submodule; the electric energy output by the output end of the main-auxiliary power automatic switching submodule comes from the main power supply;

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

[0131] When the main power supply resumes normal operation and the auxiliary power supply operates normally, the main power supply over-voltage and under-voltage protection submodule and the auxiliary power supply over-voltage and under-voltage protection submodule 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-auxiliary power supply automatic switching submodule, and the electric energy of the auxiliary power supply can be transmitted to the second input end of the main-auxiliary power supply automatic switching submodule; the electric energy output by the output end of the main-auxiliary power supply automatic switching submodule comes from the main power supply.

[0132] Furthermore, the power management module includes an energy storage component; when both the main power supply and the auxiliary power supply cannot operate normally, the main power supply over-voltage and under-voltage protection submodule and the auxiliary power supply over-voltage and under-voltage protection submodule are in a disconnected state, and the output end of the main and auxiliary power supply automatic switching submodule has no power output; the power output port of the power management module comes from the energy storage component.

[0133] Furthermore, the fuel cell device controls at least the gas management module to stop working before the electric energy of the energy storage component is consumed.

[0134] It can be seen that the contents of the above system embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above system embodiments, and the beneficial effects achieved are also the same as those achieved by the above system embodiments.

[0135] Reference Fig. 9 , an embodiment of the present invention provides a fuel cell power management device, comprising:

[0136] at least one processor 810;

[0137] At least one memory 820, used to store 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 system.

[0139] Similarly, the contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0140] An embodiment of the present invention further provides a computer-readable storage medium, in which a program executable by a processor is stored. The program executable by the processor is used to execute the above-mentioned control method of the fuel cell power system when executed by the processor.

[0141] Similarly, the contents of the above method embodiments are all applicable to the present storage medium embodiments. The functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0142] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0143] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, 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 functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several programs to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0145] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may 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 fetch and execute a program from a program execution system, device or apparatus), or in conjunction with such program execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by a program execution system, device or apparatus, or in conjunction with such program execution systems, devices or apparatuses.

[0146] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0147] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0148] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0149] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0150] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A fuel cell power management system, characterized in that: 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 auxiliary power supply works normally, the auxiliary power supply supplies power to the power management module and the auxiliary module; 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 to the main power input port of the power management module through the step-down module; the auxiliary power supply includes a power grid and a rectifier module, and the power grid is connected to the auxiliary power input port of the power management module through the rectifier module; the power output port of the power management module is connected to the auxiliary module.

2. The fuel cell power management system according to claim 1, characterized in that: The power management module includes: a main-sub power automatic switching submodule, the main power input port is connected to the first input end of the main-sub power automatic switching submodule, the sub power input port is connected to the second input end of the main-sub power automatic switching submodule, and the output end of the main-sub power automatic switching submodule is connected to the power output port; the main-sub power automatic switching submodule is used for: if both the first input end and the second input end have power input, the output end outputs the electric energy from the first input end; if the first input end has no power input and the second input end has power input, the output end outputs the electric energy from the second input end.

3. The fuel cell power management system according to claim 2, characterized in that: The main-sub power automatic switching submodule includes: a main-sub power automatic switching circuit, the main-sub power automatic switching circuit includes a power switch chip, the main power input port is connected to the drain of the first switch device, the source of the first switch device is connected to the power output port, the source of the second switch device, and the sixth port of the power switch chip, and the gate of the first switch device is connected to the first port of the power switch chip; the secondary power input port is connected to the drain of the second switch device and the seventh port of the power switch chip, the source of the second switch device is connected to the first port of the power switch chip through a first resistor, the source of the second switch device is connected to the power output port and the sixth port of the power switch chip, and the gate of the second switch device is connected to the eighth port of the power switch chip.

4. The fuel cell power management system according to claim 3, characterized in that: The automatic switching circuit of the main and auxiliary power supplies also includes: an optocoupler, the first port of the power switch chip is connected to the gate of the third switch device, the source of the third switch device is connected to the power output port, and the drain of the third switch device is connected to the first end of the optocoupler; the 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, the fourth end of the optocoupler is connected to the signal output end, the fourth end of the optocoupler is connected to the power supply through the second resistor, and the third end of the optocoupler is grounded; the fuel cell power management system is used to: determine whether the main power supply or the auxiliary power supply is currently powered according to the level of the signal output end.

5. The fuel cell power management system according to claim 2, characterized in that: The power management module includes: an energy storage unit, the charging port of the energy storage unit is connected to the output end of the main-sub power automatic switching submodule, and the power output port of the energy storage unit is connected to the power output port; the energy storage unit is used to: provide power to the auxiliary module when there is no power output at the output end of the main-sub power automatic switching submodule.

6. The fuel cell power management system according to claim 5, characterized in that: The energy storage unit may provide electrical energy for a first time period that is greater than or equal to a second time period that the auxiliary module requires to shut off the gas supply.

7. The fuel cell power management system according to claim 6, characterized in that: The first time length is t2, and the second time length is t1; wherein, t2≥a*t1, 1.2≤a≤2.

5.

8. The fuel cell power management system according to claim 2, characterized in that: The power management module includes: a main power supply over-voltage and under-voltage protection submodule and a secondary power supply over-voltage and under-voltage protection submodule; The main power input port is connected to the first input end of the main-sub power automatic switching submodule through the main power over-under voltage protection submodule, and the auxiliary power input port is connected to the second input end of the main-sub power automatic switching submodule through the auxiliary power over-under voltage protection submodule; If the voltage of the main power input port does not fall within the preset voltage range, the main power over- and under-voltage protection submodule is in a disconnected state; if the voltage of the auxiliary power input port does not fall within the preset voltage range, the auxiliary power over- and under-voltage protection submodule is in a disconnected state.

9. The fuel cell power management system according to claim 8, characterized in that: The main power supply over-voltage and under-voltage protection submodule includes: a voltage monitoring chip; The main power input port is connected to the first port of the voltage monitoring chip, the first port of the voltage monitoring chip is connected to the second port of the voltage monitoring chip through a third resistor, the second port of the voltage monitoring chip is connected to the third port of the voltage monitoring chip through a fourth resistor, the third port of the voltage monitoring chip is connected to the 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 input port is connected to the drain of the fourth switching device, the source of the fourth switching device is connected to the source of the fifth switching device, the drain of the fifth switching device is connected to the first input end of the main-sub power automatic switching submodule, the gate of the fourth switching device is connected to the gate of the fifth switching device, the gate of the fourth switching device is connected to the eighth port of the voltage monitoring chip, and the seventh port of the voltage monitoring chip is connected to the first input end of the main-sub power automatic switching submodule.

10. A control method for a fuel cell power system, characterized in that: Applied to the fuel cell power management system as described in claim 1, the method includes: if the main power supply is working normally, the main power supply supplies power to the power management module and the auxiliary module; if the main power supply is working abnormally and the auxiliary power supply is working normally, the auxiliary power supply supplies power to the power management module and the auxiliary module.

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