Power converter, power conversion system and power conversion method

Abstract

To provide a power supply converter, a power supply conversion system and a power supply conversion method which improve reliability and safety of a power transmission process.SOLUTION: The present disclosure provides a power supply converter, a power supply conversion system and a power supply conversion method, and relates to the field of an electronic circuit. The power supply converter includes: a control circuit configured to receive a first power supplied to the control circuit from an energy storage device, receive a second power supplied to the control circuit from a grid instrument, and to be powered on with a third power being the first power or the second power and output a control signal; and a power inverter circuit configured to receive the control signal and perform power conversion between the energy storage device and the grid instrument depending on the control signal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to the field of information technology, and in particular to a power converter, a power conversion system, and a power conversion method. [Background technology]

[0002] With the rapid development of electric vehicle technology, the energy density of batteries is gradually improved, the driving distance of vehicles is gradually increased, and more and more electric vehicles can participate in grid scheduling as energy storage systems.

[0003] On the one hand, when electric vehicles participate in grid scheduling, they can shed peak power from the grid, and on the other hand, they can compensate car owners for the price difference, which can reduce the purchase cost and promote the development of electric vehicles. As can be seen from the above, electric vehicles can better protect the environment by participating in grid scheduling as an energy storage system.

[0004] As an energy storage device, electric vehicles can more conveniently participate in grid scheduling by performing energy conversion with the grid via a portable device that is a power converter. Summary of the Invention [Means for solving the problem]

[0005] The present disclosure provides a portable device for a power converter.

[0006] According to a first aspect of an embodiment of the present disclosure, there is provided a power converter including: a control circuit configured to receive a first power, which is power that an energy storage device supplies to a control circuit; receive a second power, which is power that a grid equipment supplies to the control circuit; and power on with a third power, which is the first power or the second power, and output a control signal; and a power conversion circuit configured to receive the control signal and perform power conversion between the energy storage device and the grid equipment in response to the control signal.

[0007] In some embodiments, the power converter further includes a first converter configured to step down a fourth power input by the energy storage device and convert it to the first power, and a second converter configured to step down a fifth power input by the grid equipment and convert it to the second power.

[0008] In some embodiments, the control signal includes a first control signal, and the power conversion circuit is configured to convert the fourth power to a sixth power in response to the first control signal, where the fourth power is DC power and the sixth power is AC power, and where the sixth power is configured to power a grid device or an electric device.

[0009] In some embodiments, the control circuit is further configured to send a second control signal to the second converter after powering on at the first power, and the second converter is further configured to step down and convert the sixth power to a seventh power in response to the second control signal and power the control circuit at the seventh power.

[0010] In some embodiments, the control circuit is further configured to send a third control signal to the second converter after powering on at the first power or the seventh power, and the second converter is further configured to cease operation in response to the third control signal.

[0011] In some embodiments, the control signal includes a fourth control signal, and the power conversion circuit is configured to convert the fifth power to an eighth power in response to the fourth control signal, the fifth power being AC power and the eighth power being DC power, and the eighth power being configured to power the energy storage device. In some embodiments, the control circuit is further configured to send a fifth control signal to the first converter after powering on at the second power, and the first converter is further configured to step down and convert the eighth power to a ninth power in response to the fifth control signal, and to power the control circuit at the ninth power.

[0012] In some embodiments, the control circuit is further configured to send a sixth control signal to the first converter after powering on at the second power or the ninth power, and the first converter is further configured to stop operating in response to the sixth control signal.

[0013] In some embodiments, the power converter further comprises a first diode and a second diode, an anode of the first diode electrically connected to the first converter, a cathode of the first diode electrically connected to the control circuit, an anode of the second diode electrically connected to the second converter, and a cathode of the second diode electrically connected to the cathode of the first diode, the first converter further configured to power the control circuit via the first diode, and the second converter further configured to power the control circuit via the second diode.

[0014] According to a second aspect of an embodiment of the present disclosure, there is provided a power conversion system comprising: the power converter; a grid device electrically connected to the power converter and configured to output a fifth power or receive a sixth AC power; and an energy storage device electrically connected to the power converter and configured to output a fourth power or receive an eighth power.

[0015] According to a third aspect of an embodiment of the present disclosure, there is provided a power conversion system comprising: the power converter; an energy storage device electrically connected to the power converter and configured to output a fourth power or receive an eighth power; and an electrical device electrically connected to the power converter and configured to receive a sixth AC power.

[0016] According to a fourth aspect of an embodiment of the present disclosure, there is provided a power conversion method including the steps of: a control circuit receiving a first power, which is power supplied from an energy storage device to the control circuit; a control circuit receiving a second power, which is power supplied from a grid equipment to the control circuit; a control circuit powering on with a third power, which is the first power or the second power, and outputting a control signal; and a power conversion circuit receiving the control signal and performing power conversion between the energy storage device and the grid equipment in response to the control signal.

[0017] In some embodiments, the power conversion method further includes a step in which the first converter steps down a fourth power input by the energy storage device and converts it to the first power, and a step in which the second converter steps down a fifth power input by the grid equipment and converts it to the second power.

[0018] In some embodiments, the control signal includes a first control signal, and performing power conversion between the energy storage device and the grid equipment in response to the control signal includes converting a fourth power to a sixth power in response to the first control signal, where the fourth power is DC power and the sixth power is AC power, and the sixth power is configured to power the grid equipment or the electric equipment.

[0019] In some embodiments, the power conversion method further includes a step of the control circuit powering on with the first power and then sending a second control signal to the second converter, and the second converter stepping down and converting the sixth power to a seventh power in response to the second control signal, and powering the control circuit with the seventh power.

[0020] In some embodiments, the power conversion method further includes a step of the control circuit sending a third control signal to the second converter after powering on at the first power or the seventh power, and the second converter stopping operation in response to the third control signal.

[0021] In some embodiments, the control signal includes a fourth control signal, and performing power conversion between the energy storage device and the grid equipment in response to the control signal includes converting a fifth power to an eighth power in response to the fourth control signal, where the fifth power is AC power and the eighth power is DC power, and the eighth power is configured to power the energy storage device.

[0022] In some embodiments, the power conversion method further includes a step of the control circuit sending a fifth control signal to the first converter after powering on with the second power, and the first converter stepping down and converting the eighth power to a ninth power in response to the fifth control signal, and powering the control circuit with the ninth power.

[0023] In some embodiments, the power conversion method further includes a step of the control circuit sending a sixth control signal to the first converter after powering on at the second power or the ninth power, and the first converter stopping operation in response to the sixth control signal.

[0024] In some embodiments, the method of power conversion further includes the first converter powering the control circuit through a first diode, and the second converter powering the control circuit through a second diode. Effect of the Invention

[0025] The power converter disclosed herein can be powered on according to the power supplied by the grid or an energy storage device, eliminating the need for a separate power source, and further improving the reliability and safety of electric vehicles when using the power converter to transmit power.

[0026] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure taken in conjunction with the drawings.

[0027] In order to more clearly describe the embodiments of the present disclosure or the technical solutions of the related art, the following briefly describes the drawings that need to be used in the description of the embodiments or the related art, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can further obtain other drawings based on these drawings without creative labor. [Brief description of the drawings]

[0028] [Figure 1] 1 shows a structural schematic diagram of a power converter according to some embodiments of the present disclosure; [Diagram 2] 1 shows a structural schematic diagram of a power converter according to some other embodiments of the present disclosure. [Diagram 3] 1 shows a structural schematic diagram of a power conversion system according to some embodiments of the present disclosure; [Figure 4] 1 shows a structural schematic diagram of a power conversion system according to some other embodiments of the present disclosure. [Diagram 5] 1 shows a schematic flow chart of a power conversion method according to some embodiments of the present disclosure. [Figure 6] 4 shows a schematic flow chart of a power conversion method according to some further embodiments of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature, and does not limit the present disclosure and its application or use. Based on the embodiments of the present disclosure, all other embodiments that a person skilled in the art can obtain without creative labor belong to the protection scope of the present disclosure.

[0030] As an energy storage device, the electric vehicle can more conveniently participate in grid scheduling by performing energy conversion with the grid through the portable device which is a power converter. The electric vehicle can function as an energy storage device, and can further release the electric vehicle's power and supply power to electrical appliances through the portable device which is a power converter, providing more convenient services for people outdoors and more fully reflecting the advantages of the electric vehicle.

[0031] According to the inventor's research, it has been found that when power is taken from the cigarette lighter of an electric vehicle through a low-voltage power line, and the power source of the cigarette lighter is a storage battery of the electric vehicle, the storage battery is a low-voltage (12V-16V) battery, which is generally located beside the driver's seat. The energy storage device of an electric vehicle is a high-voltage power battery larger than 60V (as can be understood by those skilled in the art, the high-voltage power battery can be, for example, a lithium battery, etc.), which is generally located under the chassis or rear seat of the electric vehicle. Therefore, the cigarette lighter of an electric vehicle and the charging and discharging port of the energy storage device are generally located apart, and a long low-voltage power line needs to be drawn out to take power from the cigarette lighter and supply it to the power converter to control the energy conversion between the energy storage device and the grid equipment or electrical equipment. As a result, not only does the complexity of using the power converter increase, but there is also a risk that the power converter will suddenly power off due to human error during charging and discharging, and therefore the reliability and safety of the electric vehicle in the power transmission process is reduced. In addition, when taking power from the storage battery of an electric vehicle, it is necessary to consume the power of the storage battery, and if the energy of the storage battery is insufficient, it may cause the power supply of the storage battery, which will seriously affect the normal use of the user. When the power converter is powered by a built-in storage battery inside the power converter, the volume of the power converter is too large and it is difficult to carry. In addition, if the storage battery does not be replaced in a timely manner due to the life of the storage battery, the reliability and safety of the electric vehicle in the power transmission process will be reduced, and the manufacturing cost and maintenance cost of the power converter will increase.

[0032] In view of the above circumstances, the present disclosure provides a power converter to improve the reliability and safety of electric vehicles in the power transmission process.

[0033] First, some embodiments of the power converter of the present disclosure will be described with reference to FIG. FIG. 1 shows a structural schematic diagram of a power converter according to some embodiments of the present disclosure. As shown in FIG. 1, one side of the power converter 10 is connected to a grid device or an electric device, and the other side is connected to an energy storage device located inside the vehicle, and the power converter 10 may be a portable power conversion device, etc., and the power converter 10 itself has no power. One side of the power converter 10 is connected to the grid device, and the energy storage control system in the vehicle controls the power converter 10 to feed power to the energy storage device on the other side of the power converter 10, and when the power of the energy storage device is excessive, the energy storage control system may control the energy storage device to feed power to the grid device through the power converter 10, and as can be understood by those skilled in the art, the energy storage control system may be a battery management system or a vehicle control system, etc. When one side of the power converter 10 is connected to an electrical equipment, the energy storage control system or the control circuit of the power converter defaults to the initial state of the energy storage device being with high voltage power, thereby powering the electrical equipment on the other side of the power converter 10 through the power converter 10, and the specific power conversion mode may be selected according to the strategy of the energy storage control system, or may be selected according to the strategy of the power converter, for example, the corresponding energy conversion mode may be selected according to the object that needs to be charged, and is not particularly limited.

[0034] The power converter 10 may be located outside the vehicle and is a portable device comprising a control circuit 101 and a power conversion circuit 102 .

[0035] The control circuit 101 is configured to receive a first power, which is the power supplied from the energy storage device to the control circuit, receive a second power, which is the power supplied from the grid device to the control circuit, and power on with a third power, which is the first power or the second power, and output a control signal. As can be understood by those skilled in the art, the control circuit 101 may specifically be a single-chip microcomputer, a CPU, a control chip, etc. The energy storage control system and the control circuit 101 may communicate with each other through a wire connecting the power converter 10 and the energy storage device, or may communicate wirelessly, so as to transmit a control strategy of the energy storage control system to the control circuit 101. The control circuit 101 may output a corresponding control signal according to the control strategy of the energy storage control system to control the power conversion circuit 102 to perform different power conversion modes.

[0036] The power conversion circuit 102 is configured to receive a control signal and perform power conversion between the energy storage device and the grid device according to the control signal. As can be understood by those skilled in the art, the power conversion circuit 102 may specifically be a bidirectional DC / AC converter, and the power conversion circuit may include an AC (Alternating Current, AC power) / DC (Direct Current, Direct Current) converter and a DC / AC converter, thereby realizing energy conversion between the energy storage device and the grid, or realizing the energy storage device to power the electric device.

[0037] In this embodiment, the power converter can be operated in different modes as a portable device, i.e., by designing a portable power converter located outside the electric vehicle, the grid equipment can charge the energy storage device of the electric vehicle through the power converter, or the energy storage device of the vehicle can power the electric equipment or the grid equipment through the power converter. In the mode in which the grid equipment powers the energy storage device through the power converter, the power converter can take power from the grid equipment, in the mode in which the energy storage device supplies power to the grid equipment through the power converter, the power converter can take power from the energy storage device, and in the mode in which the grid equipment and the energy storage device perform power conversion, the control circuit of the power converter can further select one of the grid or the energy storage device to take power. In the mode in which the energy storage device powers the electric equipment through the power converter, the power converter takes power from the energy storage device. By intelligently switching the power supply method, the power converter not only eliminates the need to draw power from the cigarette lighter socket, but also eliminates the need for a built-in storage battery, solving the problem that the power converter is too large and heavy making it difficult to carry, as well as the problem that the power supply wiring is too long and prone to falling off, and avoids the problem of the built-in storage battery needing frequent repairs, thereby improving the reliability and safety of the power converter, and further improving the reliability and safety of the electric vehicle during the power transmission process.

[0038] Hereinafter, some further embodiments of the power converter of the present disclosure will be described with reference to FIG.

[0039] 2 shows a structural schematic diagram of a power converter according to some other embodiments of the present disclosure. As shown in FIG. 2, based on the embodiment corresponding to FIG. 1, the power converter 20 in this embodiment further includes a first converter 203 configured to step down the fourth power input by the energy storage device and convert it into a first power, and a second converter 204 configured to step down the fifth power input by the grid device and convert it into a second power. As can be understood by those skilled in the art, the first converter 203 and the second converter 204 may specifically be step-down converters.

[0040] In the case of DC to AC power conversion, the control signal may include a first control signal. In response to the first control signal, the power conversion circuit 102 is configured to convert the fourth power to a sixth power, where the fourth power is DC power and the sixth power is AC power, and where the sixth power is configured to power a grid device or an electric device. A voltage of the sixth power may be controlled in response to the first control signal such that a voltage of the sixth power when powering the grid device is greater than a voltage when powering the electric device.

[0041] In the case of AC to DC conversion, the control signal may further include a fourth control signal. The power conversion circuit 102 is further configured to convert the fifth power to an eighth power in response to the fourth control signal, where the fifth power is AC power and the eighth power is DC power, and where the eighth power is configured to power the energy storage device.

[0042] In some embodiments, the control circuit 101 is further configured to send a second control signal to the second converter 204 after powering on at the first power and to send a fifth control signal to the first converter 203 after powering on at the second power. The second converter 204 is further configured to step down and convert the sixth power to a seventh power in response to the second control signal and power the control circuit 101 at the seventh power, and to step down and convert the eighth power to a ninth power in response to the fifth control signal and power the control circuit 101 at the ninth power.

[0043] Specifically, when the energy storage device drives the first converter 203 to operate first to supply power to the control circuit 101, the control circuit 101 powers on, then controls the power conversion circuit 102 to operate, and the second converter 204 takes power from the power conversion circuit 102 and is in the same operating state, and finally, the first converter 203 and the second converter 204 supply power to the control circuit 101 in a competitive power supply manner; when the grid device drives the second converter 204 to operate first to supply power to the control circuit 101, the control circuit 101 powers on, then controls the power conversion circuit 102 to operate, and the first converter 203 takes power from the power conversion circuit 102 and is in the same operating state, and finally, the first converter 203 and the second converter 204 supply power to the control circuit 101 in a competitive power supply manner.

[0044] In this embodiment, the two converters can supply power to the control circuit in a competitive power supply manner, and the control circuit can select one of the two converters as the power source, and the specific selection strategy can be the one with the higher voltage among the two power sources as the power source, or other types of strategies, which are not particularly limited here. When a power supply failure occurs in one converter, the other converter can normally supply power to the control circuit, which further ensures the reliability of the electric vehicle in the power transmission process, and provides sufficient power supply guarantee for the control circuit.

[0045] In some embodiments, the control circuit 101 is further configured to send a third control signal to the second converter 204 after powering on at the first power or the seventh power, and a sixth control signal to the first converter 203 after powering on at the second power or the ninth power. The second converter 204 is further configured to stop operating in response to the third control signal and to stop operating in response to the sixth control signal. The control circuit 101 is further configured such that, upon receiving the powers of the first converter and the second converter simultaneously, the control circuit 101 is capable of controlling the other converter to stop operating after powering on at the power output by the other converter.

[0046] Specifically, when the energy storage device drives the first converter 203 to operate and supply power to the control circuit 101, the control circuit 101 can control the power conversion circuit 102 to operate after power-on, and the control circuit can put the second converter 204 in a non-operating state; when the grid device drives the second converter 204 to operate and supply power to the control circuit 101, the control circuit 101 can control the power conversion circuit 102 to operate and put the first converter 203 in a non-operating state after power-on. As can be understood by those skilled in the art, the control circuit 101 can select one converter to supply power and control the other converter to stop operating according to its own strategy or the control strategy of the energy storage control system.

[0047] In this embodiment, the control circuit maintains power supply from one converter after power-on, thereby saving power consumption and avoiding frequent switching between the two converters when competitive power supply is performed.

[0048] In some embodiments, the power converter further comprises a first diode 205 and a second diode 206, wherein the anode of the first diode 205 is electrically connected to the first converter 203, the cathode of the first diode 205 is electrically connected to the control circuit 101, the anode of the second diode 206 is electrically connected to the second converter 204, and the cathode of the second diode 206 is electrically connected to the cathode of the first diode 205, and the first converter 203 is further configured to supply power to the control circuit 101 via the first diode 205, and the second converter 204 is further configured to supply power to the control circuit 101 via the second diode 206.

[0049] The second diode can prevent the output of the first converter from affecting the second converter, and the first diode can prevent the output of the second converter from affecting the first converter, so that the present embodiment can improve the reliability and safety of the power converter.

[0050] Hereinafter, some embodiments of the power conversion system of the present disclosure will be described with reference to FIG.

[0051] 3 shows a structural schematic diagram of a power conversion system according to some embodiments of the present disclosure. As shown in FIG. 3, the power conversion system 30 includes the above-mentioned power converter 10 or 20 located outside the vehicle, a grid device 301 electrically connected to the power converter 10 or 20 and configured to output a fifth power or receive a sixth AC power, and an energy storage device 302 located inside the vehicle, electrically connected to the power converter 10 or 20 and configured to output a fourth power or receive an eighth power. As can be understood by those skilled in the art, the energy storage device may be a power battery of the electric vehicle, specifically, for example, a high-voltage power battery such as a lithium battery.

[0052] In a mode in which the grid equipment powers the energy storage device through the power converter, the power converter takes power from the grid equipment, thereby improving the reliability and safety of the power converter, and further improving the reliability and safety of the electric vehicle in the power transmission process.

[0053] Hereinafter, some other embodiments of the power conversion system of the present disclosure will be described with reference to FIG.

[0054] 4 shows a structural schematic diagram of a power conversion system according to another embodiment of the present disclosure. As shown in FIG. 4, the power conversion system 40 includes the above-mentioned power converter 10 or 20 located outside the automobile, an energy storage device 401 located inside the automobile, electrically connected to the power converter, and configured to output a fourth electric power or receive an eighth electric power, and an electric device 402 connected to the power converter 10 or 20 and configured to receive a sixth AC power.

[0055] In a mode in which the energy storage device powers the electric appliances through the power converter, the power converter draws power from the energy storage device, thereby improving the reliability and safety of the power converter, and further improving the reliability and safety of the electric vehicle during the power transmission process.

[0056] Hereinafter, some embodiments of the power conversion method of the present disclosure will be described with reference to FIG.

[0057] 5 is a schematic flowchart of a power conversion method according to some embodiments of the present disclosure. As shown in FIG 5, this embodiment includes steps S501 to S504.

[0058] In step S501, the control circuit receives a first power, which is the power that the energy storage device supplies to the control circuit.

[0059] In step S502, the control circuit receives a second power, which is the power supplied by the grid device to the control circuit.

[0060] As can be understood by those skilled in the art, the execution order of steps S501 to S502 may be interchanged, and is not limited here. In step S503, the control circuit is powered on with the first power or the third power, which is the second power, and outputs a control signal.

[0061] In step S504, the power conversion circuit receives the control signal and performs power conversion between the energy storage device and the grid equipment according to the control signal.

[0062] The selection of the third power can be determined according to a control strategy of the control circuit, specifically, the control circuit can select one of the first power and the second power, or select one of the first power and the second power with a higher voltage, or select one with a sufficient remaining power, or adopt other strategies, and is not particularly limited.

[0063] In this embodiment, by intelligently switching the power supply method during operation of the power converter, not only is it not necessary to draw power from the cigarette lighter socket, but also it is not necessary to have a built-in storage battery. This not only solves the problem that the volume and weight of the power converter is too large and difficult to carry, but also the problem that the wiring for obtaining power is too long and prone to falling off, and further avoids the problem that the built-in storage battery needs to be frequently repaired, thereby improving the reliability and safety of the power converter, and further improving the reliability and safety of the electric vehicle during the power transmission process.

[0064] Hereinafter, some other embodiments of the power conversion method of the present disclosure will be described with reference to FIG.

[0065] 6 is a schematic flow chart of a power conversion method according to some other embodiments of the present disclosure. As shown in FIG. 6, this embodiment further includes steps S6001 to S6002.

[0066] In step S6001, the first converter steps down the fourth power input by the energy storage device and converts it into a first power.

[0067] In step S6002, the second converter steps down the fifth power input by the grid device and converts it into a second power.

[0068] As can be understood by those skilled in the art, the execution order of steps S6001 to S6002 may be interchanged, and is not limited here.

[0069] In the case of converting DC power to AC power, the control signal may specifically include a first control signal. Correspondingly, in step S504, the power conversion circuit may convert the fourth power into a sixth power in response to the first control signal, where the fourth power is DC power, the sixth power is AC power, and the sixth power is configured to supply the grid device or the electric device.

[0070] In the case of converting AC power to DC power, the control signal may specifically further include a fourth control signal. Correspondingly, in step S504, the power conversion circuit may convert the fifth power into an eighth power in response to the fourth control signal, where the fifth power is AC power, the eighth power is DC power, and the eighth power is configured to power the energy storage device.

[0071] In some embodiments, the power conversion method further includes steps S605 to S606. In step S605, the control circuit powers on with the first power, and then transmits a second control signal to the second converter. In step S606, the second converter converts the sixth power into a seventh power in response to the second control signal, and supplies the seventh power to the control circuit.

[0072] In this embodiment, the two converters can supply power to the control circuit in a competitive power supply manner, and the control circuit can select one of the two converters as the power source, and the specific selection strategy can be the one with the higher voltage among the two power sources as the power source, or other types of strategies, which are not particularly limited here. When a power supply failure occurs in one converter, the other converter can normally supply power to the control circuit, which further ensures the reliability of the electric vehicle in the power transmission process, and provides sufficient power supply guarantee for the control circuit.

[0073] In some embodiments, the power conversion method further includes steps S607 to S608. In step S607, the control circuit sends a third control signal to the second converter after powering on with the first power or the seventh power, and in step S608, the second converter stops operating in response to the third control signal.

[0074] In this embodiment, the control circuit maintains power supply from one converter after power-on, thereby saving power consumption and avoiding frequent switching between the two converters when competitive power supply is performed.

[0075] In some embodiments, the power conversion method further includes steps S609 to S610. In step S609, the control circuit powers on with the second power, and then sends a fifth control signal to the first converter, and in step S610, the first converter steps down the eighth power and converts it to a ninth power in response to the fifth control signal, and supplies the ninth power to the control circuit.

[0076] In this embodiment, the two converters can supply power to the control circuit in a competitive power supply manner, and the control circuit can select one of the two converters as the power source, and the specific selection strategy can be the one with the higher voltage among the two power sources as the power source, or other types of strategies, which are not particularly limited here. When a power supply failure occurs in one converter, the other converter can normally supply power to the control circuit, which further ensures the reliability of the electric vehicle in the power transmission process, and provides sufficient power supply guarantee for the control circuit.

[0077] In some embodiments, the power conversion method further includes steps S611 to S612. In step S611, the control circuit sends a sixth control signal to the first converter after powering on with the second power or the ninth power, and in step S612, the first converter stops operating in response to the sixth control signal.

[0078] In this embodiment, the control circuit maintains power supply from one converter after power-on, thereby saving power consumption and avoiding frequent switching between the two converters when competitive power supply is performed.

[0079] In some embodiments, the power conversion method further includes steps S6003 to S6004, in which the first converter supplies power to the control circuit via a first diode in step S6003, and the second converter supplies power to the control circuit via a second diode in step S6004.

[0080] The second diode can prevent the output of the first converter from affecting the second converter, and the first diode can prevent the output of the second converter from affecting the first converter, so that the present embodiment can improve the reliability and safety of the power converter.

[0081] The present disclosure will be described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present disclosure. As will be understood, each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to generate a machine, whereby the instructions executed by the processor of the computer or other programmable data processing device generate an apparatus for implementing the function specified in a process or processes of the flowcharts and / or a block or blocks of the block diagrams.

[0082] These computer program instructions may be stored in a computer readable memory that directs a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory cause an article of manufacture including an instruction apparatus to implement the functions specified in a process or processes of the flowcharts and / or a block or blocks of the block diagrams.

[0083] These computer program instructions may be loaded onto a computer or other programmable data processing device, causing the computer or other programmable device to perform a series of operational steps to generate a computer implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the function specified in a process or processes of the flowcharts and / or a block or blocks of the block diagrams.

[0084] Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited thereto, and any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and principles of the present disclosure are all within the scope of protection of the present disclosure. [Explanation of symbols]

[0085] 10 Power Converter 20 Power Converter 30 Power Conversion System 40 Power Conversion System 101 Control circuit 102 Power Conversion Circuit 203 1st converter 204 2nd converter 205 First Diode 206 Second Diode 301 Grid Equipment 302 Energy Storage Device 401 Energy Storage Device 402 Electrical Equipment S501 Step S502 Step S503 Step S504 Step S605 Step S606 Step S607 Step S608 Step S609 Step S610 Step S611 Step S612 Step S6001 Step S6002 Step S6003 Step S6004 Step

Claims

1. 1. A power converter comprising: A control circuit configured to receive a first power, which is power supplied from an energy storage device to a control circuit, receive a second power, which is power supplied from a grid device to the control circuit, and power on with a third power, which is the first power or the second power, and output a control signal; a power conversion circuit configured to receive the control signal and perform power conversion between the energy storage device and the grid equipment in response to the control signal; a first converter configured to step down a fourth power input by the energy storage device and convert it into the first power; A second converter configured to step down a fifth power input by the grid device and convert it into the second power, the control signal includes a fourth control signal; the power conversion circuit is configured to convert the fifth power to an eighth power in response to the fourth control signal, the fifth power being AC power and the eighth power being DC power, and the eighth power being configured to power the energy storage device; The control circuit is further configured to send a fifth control signal to the first converter after powering on with the second power; The first converter is further configured to step down and convert the eighth power to a ninth power in response to the fifth control signal, and to supply the control circuit with the ninth power.

2. the control signal includes a first control signal; 2. The power converter of claim 1, wherein the power conversion circuit is configured to convert the fourth power to a sixth power in response to the first control signal, the fourth power being DC power, the sixth power being AC power, and the sixth power being configured to supply the grid equipment or electrical equipment.

3. The control circuit is further configured to send a second control signal to the second converter after powering on with the first power; 3. The power converter of claim 2, wherein the second converter is further configured to step down and convert the sixth power to a seventh power in response to the second control signal and to power the control circuit with the seventh power.

4. the control circuit is further configured to send a third control signal to the second converter after powering on at the first power or the seventh power; The power converter of claim 3 , wherein the second converter is further configured to cease operation in response to the third control signal.

5. The control circuit is further configured to send a sixth control signal to the first converter after powering on at the second power or the ninth power; The power converter of claim 1 , wherein the first converter is further configured to cease operation in response to the sixth control signal.

6. a first diode and a second diode, an anode of the first diode electrically connected to the first converter, a cathode of the first diode electrically connected to the control circuit, an anode of the second diode electrically connected to the second converter, and a cathode of the second diode electrically connected to the cathode of the first diode; The first converter is further configured to power the control circuit through the first diode; A power converter as claimed in any preceding claim, wherein the second converter is further configured to power the control circuit via the second diode.

7. 1. A power conversion system comprising: A power converter according to any one of claims 1 to 6; a grid device electrically connected to the power converter and configured to output a fifth power or receive a sixth AC power; an energy storage device electrically connected to the power converter and configured to output a fourth power or receive an eighth power.

8. 1. A power conversion system comprising: A power converter according to any one of claims 1 to 6; an energy storage device electrically connected to the power converter and configured to output a fourth power or receive an eighth power; an electrical device electrically connected to the power converter and configured to receive a sixth AC power.

9. 1. A method for power conversion, comprising: a control circuit receiving a first power, the first power being power provided to the control circuit by an energy storage device; a control circuit receiving a second power, the second power being power provided to the control circuit by a grid device; a control circuit is powered on with a third power, which is the first power or the second power, and outputs a control signal; a power conversion circuit receiving the control signal and performing power conversion between the energy storage device and the grid equipment in response to the control signal; a first converter stepping down a fourth power input by the energy storage device and converting the fourth power into the first power; The second converter further includes a step of stepping down the fifth power input by the grid device and converting it to the second power, the control signal includes a fourth control signal; the step of converting power between the energy storage device and the grid equipment in response to the control signal includes converting the fifth power to an eighth power in response to the fourth control signal, the fifth power being AC power and the eighth power being DC power, and the eighth power being configured to supply the energy storage device; a control circuit for transmitting a fifth control signal to the first converter after powering on with the second power; the first converter converts the eighth power into a ninth power by stepping down the eighth power in response to the fifth control signal, and supplies the ninth power to the control circuit.

10. the control signal includes a first control signal; 10. The power conversion method of claim 9, wherein the step of converting power between the energy storage device and the grid equipment in response to the control signal includes converting the fourth power to a sixth power in response to the first control signal, the fourth power being DC power and the sixth power being AC power, and the sixth power being configured to supply the grid equipment or an electric appliance.

11. a control circuit for transmitting a second control signal to the second converter after powering on with the first power; 11. The method of claim 10, further comprising: a step of: a second converter converting the sixth power into a seventh power by stepping down the sixth power in response to the second control signal, and supplying the control circuit with the seventh power.

12. a control circuit transmitting a third control signal to the second converter after powering on at the first power or the seventh power; 12. The method of claim 11, further comprising: stopping the second converter in response to the third control signal.

13. a control circuit transmitting a sixth control signal to the first converter after powering on at the second power or the ninth power; 10. The method of claim 9, further comprising: stopping the first converter in response to the sixth control signal.

14. a first converter powering the control circuit through a first diode; The method of any one of claims 9 to 13, further comprising the step of: a second converter powering the control circuit through a second diode.

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