Multi-mode power converter system

Abstract

The invention provides a multi-mode power converter system, which belongs to the technical field of power supply, and comprises a fuel cell unit which adopts a direct current output circuit to output direct current and adopts an alternating current output circuit to output alternating current; the multi-temperature charging unit comprises an alternating current charging circuit and a direct current charging circuit provided with multiple types of direct current output ports; the input end of the multi-mode inversion unit is connected with the direct current output circuit and the alternating current output circuit, and the output end of the multi-mode inversion unit is connected with the alternating current charging circuit through a first switch and connected with the direct current charging circuit through a second switch; the control unit controls the first switch and controls the multi-mode inverter unit to convert electric energy received by the input end into electric energy required by the alternating current charging circuit for output, or controls the second switch and controls the multi-mode inverter unit to convert electric energy received by the input end into electric energy required by the direct current charging circuit for output. The problems that battery chargers are various in variety, large in size and not easy to carry can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a multi-mode power converter system. Background Art

[0002] Current field equipment uses a large number of batteries of various models, types and properties. The differences in these battery parameters (such as voltage, capacity) and properties (such as lead-acid, nickel-metal hydride, nickel-metal hydride) require that each device and instrument be equipped with a charger. There are many types of chargers, and most of these chargers are bulky and difficult to carry, making it difficult to replenish the battery energy in time under field conditions. Summary of the invention

[0003] In view of this, it is necessary to provide a multi-mode power converter system to solve the technical problems of a wide variety of battery chargers, bulky size, and difficulty in carrying.

[0004] In order to solve the above problems, the present invention provides a multi-mode power converter system, comprising: A fuel cell unit for generating electricity based on a fuel cell and outputting direct current using a direct current output circuit and outputting alternating current using an alternating current output circuit; A multi-temperature charging unit, comprising an AC charging circuit and a DC charging circuit provided with multiple types of DC output ports; a multi-mode inverter unit, wherein the input end is respectively connected to the DC output circuit and the AC output circuit, and the output end is respectively connected to the AC charging circuit through a first switch and connected to the DC charging circuit through a second switch; A control unit is used to control the first switch to be closed and combined with controlling the multi-mode inverter unit to convert the electric energy received at the input end into the electric energy required by the AC charging circuit for output, or to control the second switch to be closed and combined with controlling the multi-mode inverter unit to convert the electric energy received at the input end into the electric energy required by the DC charging circuit for output.

[0005] In a possible implementation, the AC charging circuit includes a transformer and an AC output terminal connected in series; The DC charging circuit includes an AC / DC unit and an adapter charging card slot interface connected in series, and the adapter charging card slot interface is provided with multiple types of DC output ports.

[0006] In a possible implementation, the multi-temperature charging unit further includes: a temperature sensor and a heating device; The temperature sensor is used to collect ambient temperature data at the interface of the adapter charging card slot; The heating device is arranged at the interface of the adapter charging card slot; The control unit is also connected to the temperature sensor for controlling the heating device to heat to a second target temperature range when the ambient temperature data is within the first target temperature range.

[0007] In a possible implementation, the fuel cell unit includes: A stack module for generating electricity based on fuel gas; A fuel-electric DC / DC module, wherein the input end of the fuel-electric DC / DC module is connected to the power output end of the stack module, and the output end of the fuel-electric DC / DC module is connected to the input end of the multi-mode inverter unit; A fuel-electric DC / AC module, wherein the input end of the fuel-electric DC / AC module is connected to the output end of the fuel-electric DC / DC module, and the output end of the fuel-electric DC / AC module is connected to the input end of the multi-mode inverter unit; The high-pressure gas cylinder group is connected to the gas inlet of the fuel cell module and is used to output the fuel gas.

[0008] In a possible implementation, the fuel cell unit further includes: A pressure sensor is provided on a pipeline between the high-pressure gas cylinder group and the fuel cell stack module; A first solenoid valve is provided on a pipeline between the high-pressure gas cylinder group and the fuel cell stack module; The pipeline heating wire is arranged on the exhaust pipeline of the fuel cell module.

[0009] In a possible implementation, the fuel cell unit further includes: a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a one-way valve, an explosion-proof blower, a flame arrester, and a purge port; The second solenoid valve is arranged on the pipeline between the high-pressure gas cylinder group and the stack module, and the third solenoid valve is arranged on the exhaust pipeline of the stack module; The purge port, the flame arrester, the explosion-proof fan, the one-way valve, and the fourth solenoid valve are connected in sequence and then connected to the pipeline between the first solenoid valve and the second solenoid valve.

[0010] In a possible implementation, the fuel cell unit further includes: A current sensor is provided between the stack module and the fuel-electric DC / DC module, and is used to collect current data output by the stack module; A voltage sensor is provided between the stack module and the fuel-electric DC / DC module, and is used to collect voltage data output by the stack module; Energy management board; The stack controller is communicatively connected to the current sensor, the voltage sensor, and the energy management board respectively, and is configured to control the energy management board to distribute the direct current output by the fuel cell DC / DC module by combining the current data and the voltage data.

[0011] In a possible implementation, the fuel cell unit further includes: A stack heating unit; A heat dissipation system; The stack controller is also communicatively connected to the stack heating unit and the heat dissipation system respectively, and is configured to control the stack heating unit to heat the stack module during cold start of the stack module, and to control the heat dissipation system to dissipate heat from the stack module when the temperature of the stack module exceeds a preset temperature threshold.

[0012] In a possible implementation, the multi-mode inverter unit includes: An inverter circuit; An isolation boost circuit; A rectifier circuit; An AC-DC separator, the DC output terminal of which is connected to the inverter circuit through the isolation boost circuit, and the AC output terminal of which is connected to the inverter circuit through the rectifier circuit; An identification unit, connected to the fuel cell unit, configured to identify the received electric energy, input the received alternating current to the AC input terminal of the AC-DC separator, so as to output the alternating current to the rectifier circuit through the corresponding AC output terminal of the AC input terminal, and input the received direct current to the DC input terminal of the AC-DC separator, so as to output the direct current value to the isolation boost circuit through the corresponding DC output terminal of the DC input terminal.

[0013] In a possible implementation, the multi-mode power converter system further includes an external input DC path and a non-standard AC path connected to the identification unit.

[0014] The beneficial effects of adopting the above implementation method are as follows: the multi-mode power converter system provided by the present invention adopts a fuel cell unit to generate electricity, and can output both direct current and alternating current. After the fuel cell unit outputs direct current or alternating current and other electrical energy through power generation, the control unit controls the switch on the AC charging circuit or the DC charging circuit to close, so that charging can be performed through the AC charging circuit or the DC charging circuit. The control unit can control the multi-mode inverter unit to convert the received electrical energy into the electrical energy required for charging and transmit it to the DC charging circuit or the AC charging circuit according to the actual needs of charging, so as to realize the charging needs of the DC device or the AC device, and the DC charging circuit of the DC output port is provided with multiple types of DC output ports, which expands the types of chargers, avoids using multiple different types of chargers to charge different batteries, and can provide for centralized batch charging of multiple types of batteries, solves the problem of a wide variety of chargers, and does not need to use a large number of traditional chargers, thereby solving the problem of bulky volume, difficulty in carrying, and difficulty in timely replenishing energy for the battery under conditions such as field operations, rescue, and emergency relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of an embodiment of a multi-mode power converter system provided by the present invention; Figure 2 A working principle diagram of the battery stack module provided by the present invention; Figure 3 A schematic diagram of a multi-mode inverter unit provided by the present invention; Figure 4 A schematic structural diagram of a first box provided by the present invention; Figure 5 This is a schematic structural diagram of the second box provided by the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0019] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or equipment.

[0020] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0021] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] like Figure 1 As shown, the present invention provides a multi-mode power converter system, comprising: A fuel cell unit for generating electricity based on a fuel cell and outputting direct current using a direct current output circuit and outputting alternating current using an alternating current output circuit; A multi-temperature charging unit, comprising an AC charging circuit and a DC charging circuit provided with multiple types of DC output ports; A multi-mode inverter unit 16, whose input end is respectively connected to the DC output circuit and the AC output circuit, and whose output end is respectively connected to the AC charging circuit through a first switch and to the DC charging circuit through a second switch; The control unit 28 is used to control the first switch to be closed and control the multi-mode inverter unit 16 to convert the electric energy received at the input end into the electric energy required by the AC charging circuit for output, or control the second switch to be closed and control the multi-mode inverter unit 16 to convert the electric energy received at the input end into the electric energy required by the DC charging circuit for output. The first switch may be a first contactor 19, and the second switch may be a second contactor 27.

[0023] It can be understood that the present invention provides a novel portable multi-mode power converter system, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the system includes: a fuel cell unit, a multi-mode inverter unit 16, a multi-temperature charging unit, a control unit 28, and a box. The fuel cell unit includes a high-pressure gas cylinder group 1, a pressure sensor 2, a solenoid valve, a stack module 5, a pipeline heating area, an exhaust port 8, a one-way valve 14, an explosion-proof fan 13, a flame arrester 12, a purge port 11, a fan 30, a current sensor 31, a voltage sensor 32, a contactor, a stack controller 34, a terminal 35, an energy management board 36, a lithium battery block, etc. The multi-mode inverter unit 16 includes an external input DC circuit 17, an external input non-standard AC circuit 18, an identification unit 40, an AC / DC separator 41, an isolation boost circuit 42, a rectifier circuit 45, an inverter circuit 43, a monitoring circuit 44, etc. The multi-temperature charging unit includes a contactor, a transformer 20, an AC output terminal, an AC / DC module, a temperature sensor 26, a heating device 24, an adapter charging card slot interface 22, a DC output port 23, etc. The control unit 28 includes a control circuit, a controller, a lithium battery, etc.

[0024] The control unit 28 mainly controls the coordinated work of several major units. The control unit 28 controls the power generation of the fuel cell unit by controlling the flow and pressure of the fuel cell unit's air inlet; the control unit 28 controls the AC and DC output by controlling the DC shunt, isolation boost circuit 42, rectifier circuit 45, inverter circuit 43, etc. of the multi-mode inverter unit 16; the control unit 28 controls the multi-temperature charging unit to intelligently charge the battery through the temperature sensor 26, the induction device, etc., and when the ambient temperature is lower than the preset value, the heating device 24 is controlled to heat and keep warm, so as to realize the function of normal charging even at low temperatures.

[0025] The boxes are two small military marching boxes with small size, light weight and easy to move. The fuel cell unit and the control unit 28 are located in one box, and the multi-mode inverter unit 16 and the multi-temperature charging unit are located in one box. When in use, the quick-plug interface in the box is used to achieve quick parallel use.

[0026] The steps of using the portable multi-mode power converter system are as follows: Connect the two boxes successfully using the quick-plug interface, open the box, and expose the charging card slot; Start the fuel cell unit button, feed lithium battery, and the control unit 28 opens the air inlet solenoid valve of the high-pressure gas cylinder group 1, starts the purge circuit to purge the stack and pipeline, and starts the stack to convert electricity after the purge is completed. The control unit 28 can accurately distribute the electricity according to the output end power demand; Turn on the multi-mode inverter switch, and the control unit 28 connects the output power to the multi-mode inverter unit 16. The multi-mode inverter unit 16 separates the input power into AC and DC through the AC / DC shunt module. When DC input is used, connect one end of the configured DC input line to the DC input socket, and one end of the crocodile clip to the positive and negative poles of the battery pack. Pay attention to the polarity of the positive and negative poles when connecting. The red clip is for the positive pole of the battery pack, and the black clip is for the battery pack. After the connection is firm, turn on the DC input switch, then turn on the AC output switch, and the working status indicator light will be on. When AC input is used, connect the configured AC input line to the AC input socket, and connect the other three plugs to the AC power grid. Turn on the input switch, then turn on the AC output switch, and the working status indicator light will be on.

[0027] The control unit 28 controls the contactors of different paths to close, sends the AC output to the quick-plug interface, sends the DC power to the charging card slot interface, inserts the battery into the socket to be charged, and the temperature sensor 26 detects the ambient temperature. If the temperature is too low, the control system turns on the heating device 24 to maintain the temperature at normal levels to charge the battery.

[0028] After charging is completed, the indicator light changes from red to green, and the control unit 28 automatically disconnects the fully charged batteries in the multi-temperature charging unit, while the batteries that are not fully charged will continue to charge.

[0029] After use, put the charging card slot into the box, cut off the gas and circuit lines with the control system, manually turn off the fuel cell switch and multi-mode inverter switch, and store the box.

[0030] The multi-mode power converter system provided by the present invention has the following beneficial effects: The multi-mode inverter unit 16 is controlled by the control unit so that the multi-mode inverter unit 16 converts the input AC or DC power and outputs it. When one of the inputs fails, it can switch to another input to achieve the purpose of uninterrupted charging and switching. Secondly, the multi-mode inverter unit 16 in the system device can invert DC and non-standard AC power into high-quality single-phase industrial frequency AC power, provide AC power for electrical equipment designed for communication, solve the problem of difficulty in obtaining power from DC and non-standard AC power sources, and improve the quality of power.

[0031] The functions of the AC charging circuit in the multi-temperature charging unit and the DC charging circuit with multiple types of DC output ports are equivalent to multi-type chargers, which can be used for centralized batch charging of multiple types of batteries, solving the problem that there are many types of chargers, they are bulky and difficult to carry, making it difficult to replenish energy for batteries in time under conditions of field operations, rescue, and emergency relief.

[0032] In addition, the equipped fuel cell unit can quickly provide input power for the multi-mode inverter unit 16 and the charging unit, which can solve the problem of no input power in the wild environment. There is no need to spend a lot of time and energy to find input power, and it can provide power for field equipment in a timely and effective manner.

[0033] In some embodiments, the AC charging circuit includes a transformer 20 and an AC output terminal connected in series; The DC charging circuit includes an AC / DC unit 25 and an adapter charging card slot interface 22 connected in series, and the adapter charging card slot interface 22 is provided with multiple types of DC output ports.

[0034] It is understandable that the adapter charging card slot interface 22 is provided with multiple types of DC output ports, which can charge multiple different types of batteries, thereby replacing multiple different types of chargers.

[0035] In some embodiments, the multi-temperature charging unit further includes: a temperature sensor 26 and a heating device 24; The temperature sensor 26 is used to collect ambient temperature data at the adapter charging card slot interface 22; The heating device 24 is arranged at the adapter charging card slot interface 22; The control unit 28 is also in communication with the temperature sensor 26 and is used to control the heating device 24 to heat to a second target temperature range when the ambient temperature data is within the first target temperature range.

[0036] It can be understood that the multi-temperature charging unit is divided into two output blocks, one output is AC230V, and the other is DC output, including AC input port, n-way 18650 DC output interface, TBP316 DC output interface, TBP-0307 DC output interface, DDZ-01 DC output interface, 7.2V / 4Ah DC output interface, TBP-0306 DC output interface, standard USB output interface, multi-function charger and other charging seat accessories. The charging unit has a corresponding charging status indicator light display function for each charging output, so that the charging process is clear at a glance. The multi-temperature charging unit adopts a closed structure and has a temperature sensor 26 and a heating and heat preservation function; the total volume of the heat preservation function area should be able to meet the simultaneous charging of various types of batteries in the reserved interface; when the ambient temperature is between -41℃ and 0℃, the temperature sensor 26 will feed back the signal to the control unit 28, and the temperature of the heat preservation function area will be maintained at 5℃ to 35℃ by controlling the heating and heat preservation means.

[0037] The multi-temperature charging unit can charge 12V-17 lithium batteries, 24V-3 lithium batteries, 18650 batteries, 3V-8 lithium batteries, 2 6V-2 lithium batteries, DDZ-01 Beidou second-generation battery, 180E walkie-talkie battery, 3.6V / 4.6Ah Tiantong handheld battery, 7.2V / 2Ah 380MHz digital cluster walkie-talkie battery, 7.2V / 4Ah satellite handheld station battery, TBP0307 170 radio battery, mobile phone lithium battery and other batteries.

[0038] In some embodiments, the fuel cell unit comprises: A fuel cell module 5, for generating electricity based on fuel gas; A fuel-electric DC / DC module 10, wherein the input end of the fuel-electric DC / DC module 10 is connected to the power output end of the stack module 5, and the output end of the fuel-electric DC / DC module 10 is connected to the input end of the multi-mode inverter unit 16; A fuel-electric DC / AC module 9, wherein the input end of the fuel-electric DC / AC module 9 is connected to the output end of the fuel-electric DC / DC module 10, and the output end of the fuel-electric DC / AC module 9 is connected to the input end of the multi-mode inverter unit 16; The high-pressure gas cylinder group 1 is connected to the gas inlet of the fuel cell module 5 and is used to output fuel gas.

[0039] It can be understood that the fuel-fired power DC / DC module 10 is used to convert the input direct current into the required direct current for output, and the fuel-fired power DC / AC module 9 is used to convert the input direct current into the required alternating current for output.

[0040] The fuel cell stack module 5 is mainly composed of bipolar plates, proton exchange membranes, carbon paper, catalysts, current collectors and end plates. The stack mainly converts the chemical energy of the reaction between hydrogen and oxygen into electrical energy. The fuel cell unit system can also be connected to hydrogen for continuous power generation, or directly connected to a modular field microgrid power supply system, or directly power a multi-temperature charging unit.

[0041] In some embodiments, the fuel cell unit further comprises: A pressure sensor 2 is provided on a pipeline between the high-pressure gas cylinder group 1 and the fuel cell stack module 5; A first solenoid valve 3 is provided on a pipeline between the high-pressure gas cylinder group 1 and the fuel cell stack module 5; The pipeline heating wire 7 is arranged on the exhaust pipeline of the fuel cell stack module 5 .

[0042] It is understandable that when the output pressure of the high-pressure gas cylinder group 1 collected by the pressure sensor 2 is higher than the threshold, the output pressure can be adjusted by the first solenoid valve 3. The pipeline heating wire 7 can heat the exhaust gas discharged by the stack module 5.

[0043] In some embodiments, the fuel cell unit further includes: a second solenoid valve 4, a third solenoid valve 6, a fourth solenoid valve 15, a one-way valve 14, an explosion-proof fan 13, a flame arrester 12 and a purge port 11; The second solenoid valve 4 is arranged on the pipeline between the high-pressure gas cylinder group 1 and the stack module 5, and the third solenoid valve 6 is arranged on the exhaust pipeline of the stack module 5; The purge port 11 , the flame arrester 12 , the explosion-proof fan 13 , the one-way valve 14 , and the fourth solenoid valve 15 are connected in sequence and then connected to the pipeline between the first solenoid valve 3 and the second solenoid valve 4 .

[0044] In some embodiments, the fuel cell unit further comprises: A current sensor 31 is provided between the stack module 5 and the fuel-electric DC / DC module 10 and is used to collect current data output by the stack module 5; A voltage sensor 32 is provided between the stack module 5 and the fuel-electric DC / DC module 10 and is used to collect voltage data output by the stack module 5; Energy management board 36; The stack controller 34 is respectively connected to the current sensor 31 , the voltage sensor 32 and the energy management board 36 for controlling the energy management board 36 to distribute the DC power output by the fuel-electric DC / DC module 10 in combination with the current data and the voltage data.

[0045] In some embodiments, the fuel cell unit further comprises: Stack heating unit; Cooling system 37; The battery stack controller 34 is also communicated with the battery stack heating unit and the heat dissipation system 37 respectively, and is used to control the battery stack heating unit to heat the battery stack module 5 when the battery stack module 5 is cold started, and to control the heat dissipation system 37 to dissipate heat from the battery stack module 5 when the temperature of the battery stack module 5 exceeds a preset temperature threshold.

[0046] It can be understood that the pipelines of the fuel cell unit are mainly divided into three routes, namely the main pipeline, the exhaust pipeline, and the purge pipeline. The main pipeline is provided with components such as a pressure sensor 2 and a solenoid valve. Through the high-pressure gas cylinder group 1, hydrogen is transported to the stack module 5 for electrical energy output, and then the electrical energy is transferred to the next unit or used directly through the DC / DC module or the DC / AC module. The exhaust pipeline is mainly used for the stack module 5 to discharge exhaust gas. The pipeline is provided with a solenoid valve and a heating device 24. The exhaust pipeline is connected to the module housing with a quick plug, and then connected to the exhaust port 8 of the box by a quick plug. The purge pipeline is provided with components such as a solenoid valve and a one-way valve 14, which are used for daily pipeline purge and purge of water vapor generated by the reaction. When the stack is started, the solenoid valve opens to purge the stack and the entire pipeline system. After the stack runs smoothly, pulse exhaust is performed at a set frequency to purge water vapor.

[0047] In some embodiments, the multi-mode inverter unit 16 is also used to first boost the input DC power and convert the boosted DC power into the electric energy required by the AC charging circuit for output when the input end receives DC power and the voltage of the DC power is lower than its own working voltage.

[0048] It is understandable that the multi-mode inverter unit 16 can convert a variety of different input voltages into the required charging voltage, which can meet more charging requirements.

[0049] In some embodiments, the multi-mode inverter unit 16 includes: Inverter circuit 43; An isolated boost circuit 42; Rectification circuit 45; The AC / DC separator 41 has a DC output end connected to the inverter circuit 43 through the isolation boost circuit 42, and an AC output end connected to the inverter circuit 43 through the rectifier circuit 45; The identification unit 40 is connected to the fuel cell unit and is used to identify the received electric energy, input the received AC power to the AC input end of the AC / DC separator 41, so as to output the AC power to the rectifier circuit 45 through the AC output end corresponding to the AC input end, and input the received DC power to the DC input end of the AC / DC separator 41, so as to output the DC power to the isolation boost circuit 42 through the DC output end corresponding to the DC input end.

[0050] It can be understood that the multi-mode inverter unit 16 has two inputs, namely, a DC input and an AC input. The AC input can also be a non-standard input. The core includes an AC / DC shunt, an isolation boost circuit 42, a rectifier circuit 45, an inverter circuit 43, etc., and can output a variety of DC and AC. The AC power input of the multi-mode inverter unit 16 is converted into DC power by the AC-DC module of the multi-mode inverter unit 16, and is inverted into AC230V AC output by the DC-AC module. When the multi-mode inverter unit 16 has a DC input, when the voltage of the DC input is lower than the working voltage of the DC-AC module of this unit, it is converted into a DC voltage adapted to the operation of the DC-AC module by the DC boost module and inverted into AC230V AC output; when the DC source input voltage such as a battery is within the normal working voltage range of the inverter module, the boost module does not work, and is directly powered by a DC power source such as a battery. When the multi-mode inverter unit 16 has AC input, the DC voltage output by the AC-DC module is higher than the voltage supplied by the DC source, and the AC input is preferentially converted into DC output. After the AC is disconnected, the DC source provides the DC output, and there is no conversion time in the middle, thus achieving seamless switching.

[0051] The multi-mode inverter unit 16 has overload and short-circuit protection functions. When a fault occurs, it automatically disconnects the circuit and issues an alarm indication.

[0052] In some embodiments, the multi-mode power converter system further includes: an external input DC path 17 and a non-standard AC path 18 connected to the identification unit 40 .

[0053] It can be understood that the external input DC circuit 17 can be used to receive power from an external DC power source, and the non-standard AC circuit 18 can receive AC power transmitted by a non-standard AC power source.

[0054] In some embodiments, the present invention provides a novel portable multi-mode power converter system, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the system includes: a fuel cell unit, a multi-mode inverter unit 16, a multi-temperature charging unit, a control unit 28, and a box.

[0055] The fuel cell unit includes a pipeline, a stack module 5, a control system, a power inverter module, etc. The fuel cell unit pipeline is mainly divided into three routes, namely, a main pipeline, an exhaust pipeline, and a purge pipeline. The main pipeline is provided with components such as a high-pressure gas cylinder group 1, a pressure sensor 2, and a first solenoid valve 3, which mainly transport hydrogen to the stack module 5 to supply gas for it. The purge pipeline mainly includes a solenoid valve, a one-way valve 14, an explosion-proof fan 13, a flame arrester 12, a purge port 11, and is used for daily pipeline purge and purge reaction generated water vapor. When the stack is started, the first solenoid valve 3 opens to purge the stack module 5 and the entire pipeline system. After the stack module 5 runs smoothly, pulse exhaust is performed at a set frequency to purge water vapor. The exhaust pipeline is provided with a third solenoid valve 6, a pipeline heating wire 7, and an exhaust port 8. The exhaust pipeline is mainly used for the stack module 5 to discharge exhaust gas. The exhaust pipeline is connected to the shell of the stack module 5 and then connected to the exhaust port 8 by the quick plug.

[0056] The stack module 5 is provided with a fan 30 for dissipating heat from the stack module 5. The fuel cell unit also includes a current sensor 31, a voltage sensor 32, a stack controller 34, a terminal 35, a fuel-electric DC / DC module 10, an energy management board 36, a heat dissipation system 37, a tail heating system 38, a stack heating system 39, etc., which are mainly used for the operation of the stack module 5 and the output of electric energy, and can meet the requirements of cold start at -15°C to -20°C.

[0057] The multi-mode inverter unit 16 is divided into input, inverter, output and other modules. The two inputs are an external input DC line 17 and a non-standard AC line 18.

[0058] The multi-mode inverter unit 16 includes an identification unit 40, an AC / DC separator 41, an isolation boost circuit 42, a monitoring circuit 44, a rectifier circuit 45 and an output end, etc. It can be used to invert the voltage of the external input DC circuit 17 and the non-standard AC circuit 18 into a standard and directly usable power supply for charging the rear-end multi-temperature charging unit battery, and can also convert the output voltage of the fuel cell unit and output it.

[0059] The multi-temperature charging unit is divided into two parts: an AC output circuit and a DC output circuit. The AC output circuit includes a first contactor 19, a transformer 20, and an AC230V output terminal 21, and the DC output circuit includes a second contactor 27, a temperature sensor 26, an AC / DC unit 25, a heating device 24, a DC output terminal, an adapter charging card slot interface 22, etc. It is mainly used to charge multiple types of batteries in low temperature environments and normal temperature environments, and can be used for centralized batch charging of multiple types of batteries.

[0060] The box body includes two major parts, one is a first box body 46, which is used to place the fuel cell unit and the control unit 28. The outside of the box body is provided with button indicator lights, quick-plug interfaces and other components, which are mainly used to load the fuel cell unit and the control unit 28. The other is a second box body 49, which is used to place the multi-mode inverter unit 16 and the multi-temperature charging unit. When there is a power supply demand in the field, the quick-plug interfaces in the two boxes can be connected to achieve quick parallel use.

[0061] In other embodiments, the two boxes, namely the first box 46 and the second box 49, are connected successfully using a quick-plug interface, and the first box 46 and the second box 49 are opened. Figure 1 , Figure 2 As shown, during the cold start process of the stack module 5, the lithium battery 29 provides the starting power for the stack heating system 39, the heat dissipation system 37, and the tail heating system 38. When the fan 30 blows air into the stack module 5, the cold air is heated to hot air to heat the central area of ​​the stack module 5, thereby heating the entire stack module 5. The stack module 5 is provided with an ambient temperature sensor 26 to determine whether the stack module 5 is heated to a suitable temperature so that it can be started by hydrogen. When the stack module 5 is started, the stack controller 34 determines the current ambient temperature through the ambient temperature sensor 26. When the ambient temperature is lower than 0°C, the pipeline heating wire 7 is started for heating to prevent the water vapor in the pipeline from freezing and clogging. When the pipeline is at a suitable temperature, it is determined whether the hydrogen pressure at the inlet of the stack module 5 meets the required pressure of the stack module 5. When the required pressure is appropriate, the stack controller 34 opens the valve of the stack module 5 to perform a purge.

[0062] The control unit 28 opens the inlet solenoid valve (i.e., the second solenoid valve 4) of the stack module 5, the inlet solenoid valve (i.e., the fourth solenoid valve 15) of the purge pipeline, and the explosion-proof fan 13 in sequence. In addition, in order to prevent hydrogen reflux and deflagration, the pipeline is installed with a one-way valve 14 and a flame arrester 12. At this time, the control unit 28 will open the intake valve (i.e., the first solenoid valve 3) of the high-pressure gas cylinder group 1, adjust the purge pressure according to the pressure feedback from the pressure sensor 2, and then start the purge circuit to purge the stack module 5 and the pipeline. When the purge frequency and time meet the requirements, the control unit 28 first closes the fourth solenoid valve 15, and then closes the intake valve (i.e., the first solenoid valve 3), the inlet solenoid valve (i.e., the second solenoid valve 4), and the explosion-proof fan 13 in sequence, and the purge work is completed.

[0063] After the stack module 5 starts and runs stably, pulse exhaust is performed at a set frequency to purge the water generated by the reaction of the stack module 5. The energy management board 36 is used to reasonably distribute the power output of the lithium battery 29 and the stack according to the data collected by the current sensor 31 and the voltage sensor 32. In addition, when the stack module 5 outputs surplus power, the lithium battery 29 can be charged through the fuel-electric DC / DC module 10 via the bus. The energy management board 36 divides the output power into the fuel-electric DC / DC module 10 and the fuel-electric DC / AC module 9 and sends them to the multi-mode inverter unit 16.

[0064] The multi-mode inverter unit 16 has two types of inputs, one is the fuel cell input for the fuel-electric DC / DC module 10 and the fuel-electric DC / AC module 9, and the other is the external input DC path 17 and the non-standard AC path 18. When the multi-mode inverter unit 16 inputs power, the identification unit 40 identifies the received electric energy, and then sends it to the AC / DC separator 41 to divide the electric energy into a DC path and an AC path. When the DC input voltage is lower than the working voltage of the DC-AC module of this unit, it is converted into a DC voltage suitable for the operation of the DC-AC module through the isolation boost circuit 42 and then inverted and output through the inverter circuit 43. When the DC source input voltage is within the normal working voltage range of the inverter module, the isolation boost circuit 42 does not work, and the DC power supply such as the battery is directly powered. When the AC input is lower than the voltage of the DC source power supply, it passes through the rectifier circuit 45 and then inverts and outputs the AC power. When the output DC voltage is higher than the voltage of the DC source power supply, the AC input is preferentially converted into a DC output. After the AC is disconnected, the DC source provides the DC output. AC and DC are connected at the same time, with AC power supply priority. When AC power is cut off, DC power supply such as batteries is used to supply power, realizing seamless switching. The inverter unit has overload and short-circuit protection functions. When a fault occurs, it will automatically disconnect and issue an alarm indication.

[0065] After the multi-temperature charging unit receives the electric energy after the multi-mode inverter output, the control unit 28 closes the second contactor 27, and the electric energy is transmitted to the adapter charging card slot after rectification and inversion. The adapter charging card slot is provided with multiple DC output charging ports. The upper cover of the charging unit is unfolded, and various battery holder charging cables are taken out. At normal temperature, the power switch on the first box 46 is turned on and closed, and the working indicator light on the side wall of the box is lit. The battery can be connected to the corresponding charger to realize adaptive charging of the battery. Under low temperature conditions, the multi-temperature charging unit is connected to the power supply, and the temperature sensor 26 on the multi-temperature charging unit feeds back the signal to the control unit 28, and the multi-temperature charging unit enters the heating and heat preservation state. When the temperature control display screen of the multi-temperature charging unit shows that the current temperature reaches about 5°C, the charging circuit is closed, and the charger and battery can be connected for adaptive charging. When the battery is charging, the charging indicator light is red, and the indicator light turns green when the battery is full, and it can be taken out for use.

[0066] The multi-mode power converter system provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A multi-mode power converter system, characterized in that: include: A fuel cell unit for generating electricity based on a fuel cell and outputting direct current using a direct current output circuit and outputting alternating current using an alternating current output circuit; A multi-temperature charging unit, comprising an AC charging circuit and a DC charging circuit provided with multiple types of DC output ports; a multi-mode inverter unit, wherein the input end is respectively connected to the DC output circuit and the AC output circuit, and the output end is respectively connected to the AC charging circuit through a first switch and connected to the DC charging circuit through a second switch; A control unit is used to control the first switch to be closed and combined with controlling the multi-mode inverter unit to convert the electric energy received at the input end into the electric energy required by the AC charging circuit for output, or to control the second switch to be closed and combined with controlling the multi-mode inverter unit to convert the electric energy received at the input end into the electric energy required by the DC charging circuit for output.

2. The multi-mode power converter system according to claim 1, wherein: The AC charging circuit comprises a transformer and an AC output terminal connected in series; The DC charging circuit includes an AC / DC unit and an adapter charging card slot interface connected in series, and the adapter charging card slot interface is provided with multiple types of DC output ports.

3. The multi-mode power converter system according to claim 2, wherein: The multi-temperature charging unit further includes: a temperature sensor and a heating device; The temperature sensor is used to collect ambient temperature data at the interface of the adapter charging card slot; The heating device is arranged at the interface of the adapter charging card slot; The control unit is also connected to the temperature sensor for controlling the heating device to heat to a second target temperature range when the ambient temperature data is within the first target temperature range.

4. The multi-mode power converter system according to claim 1, wherein: The fuel cell unit comprises: A stack module for generating electricity based on fuel gas; A fuel-electric DC / DC module, wherein the input end of the fuel-electric DC / DC module is connected to the power output end of the stack module, and the output end of the fuel-electric DC / DC module is connected to the input end of the multi-mode inverter unit; A fuel-electric DC / AC module, wherein the input end of the fuel-electric DC / AC module is connected to the output end of the fuel-electric DC / DC module, and the output end of the fuel-electric DC / AC module is connected to the input end of the multi-mode inverter unit; The high-pressure gas cylinder group is connected to the gas inlet of the fuel cell module and is used to output the fuel gas.

5. The multi-mode power converter system according to claim 4, wherein: The fuel cell unit further comprises: A pressure sensor is provided on a pipeline between the high-pressure gas cylinder group and the fuel cell stack module; A first solenoid valve is provided on a pipeline between the high-pressure gas cylinder group and the fuel cell stack module; The pipeline heating wire is arranged on the exhaust pipeline of the fuel cell module.

6. The multi-mode power converter system according to claim 5, wherein: The fuel cell unit further includes: a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a one-way valve, an explosion-proof blower, a flame arrester and a purge port; The second solenoid valve is arranged on the pipeline between the high-pressure gas cylinder group and the stack module, and the third solenoid valve is arranged on the exhaust pipeline of the stack module; The purge port, the flame arrester, the explosion-proof fan, the one-way valve, and the fourth solenoid valve are connected in sequence and then connected to the pipeline between the first solenoid valve and the second solenoid valve.

7. The multi-mode power converter system according to claim 4, wherein: The fuel cell unit further comprises: A current sensor is provided between the stack module and the fuel-electric DC / DC module, and is used to collect current data output by the stack module; A voltage sensor is provided between the stack module and the fuel-electric DC / DC module, and is used to collect voltage data output by the stack module; Energy management board; The stack controller is respectively connected to the current sensor, the voltage sensor and the energy management board for controlling the energy management board to distribute the direct current output by the fuel-electric DC / DC module in combination with the current data and the voltage data.

8. The multi-mode power converter system according to claim 7, wherein: The fuel cell unit further comprises: Stack heating unit; Cooling system; The stack controller is also communicatively connected with the stack heating unit and the heat dissipation system, respectively, and is used to control the stack heating unit to heat the stack module when the stack module is cold started, and to control the heat dissipation system to dissipate heat from the stack module when the temperature of the stack module exceeds a preset temperature threshold.

9. The multi-mode power converter system according to any one of claims 1 to 8, characterized in that: The multi-mode inverter unit comprises: Inverter circuit; Isolation boost circuit; Rectification circuit; An AC / DC separator, wherein the DC output end is connected to the inverter circuit through the isolation boost circuit, and the AC output end is connected to the inverter circuit through the rectifier circuit; An identification unit is connected to the fuel cell unit and is used to identify the received electric energy, input the received alternating current into the alternating current input terminal of the alternating current / direct current separator so as to output the alternating current to the rectifier circuit through the alternating current output terminal corresponding to the alternating current input terminal, and input the received direct current into the direct current input terminal of the alternating current / direct current separator so as to output the direct current to the isolation boost circuit through the direct current output terminal corresponding to the direct current input terminal.

10. The multi-mode power converter system according to claim 9, wherein: The multi-mode power converter system further includes: an external input DC circuit and a non-standard AC circuit connected to the identification unit.

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