Power supply device

Abstract

The application discloses a power supply device, which comprises a control circuit, a power supply circuit, a first inverter circuit, a second inverter circuit, a current detection circuit, a grid-connected port and a load port. The rated power of the second inverter circuit is greater than that of the first inverter circuit. The control circuit is used for controlling the current detection circuit to detect current information between the first inverter circuit and the second inverter circuit. When the current information does not match preset current information, the second power output by the second inverter circuit is adjusted until the current information matches the preset current information. In this way, the first inverter circuit and the second inverter circuit can meet loads with different powers, increase the application scenarios of the power supply device and improve the user experience.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply device. Background Technology

[0002] Home energy storage is becoming increasingly popular, for example, power supply units are used on balconies. However, the output power of existing power supply units is relatively small, only able to meet the needs of low-power loads on balconies. Consequently, the application scenarios for these power supply units are limited, and they cannot simultaneously meet the needs of both low-power and high-power loads, affecting the user experience. Utility Model Content

[0003] The main technical problem addressed by this application is to provide a power supply device that, by setting up a first inverter circuit and a second inverter circuit, wherein the power of the second inverter circuit is greater than that of the first inverter circuit, solves the technical problem that the power supply device has relatively few application scenarios.

[0004] This application provides a power supply device, including a control circuit, a power supply circuit, a first inverter circuit, a second inverter circuit, a current detection circuit, a grid connection port, and a load port. A first terminal of the first inverter circuit and a first terminal of the second inverter circuit are electrically connected to the power supply circuit. A second terminal of the first inverter circuit is electrically connected to the grid connection port. A second terminal of the second inverter circuit is electrically connected to the grid connection port via the current detection circuit. The output power of the grid connection port is less than a preset power threshold. A second terminal of the second inverter circuit is connected to the load port. The rated power of the second inverter circuit is greater than the rated power of the first inverter circuit. The first inverter circuit is used to output a first power. The control circuit is electrically connected to the current detection circuit, the first inverter circuit, and the second inverter circuit, respectively.

[0005] The control circuit is used to control the current detection circuit to detect the current information between the first inverter circuit and the second inverter circuit; when the current information does not match the acquired preset current information, the second power output by the second inverter circuit is adjusted until the current information matches the preset current information.

[0006] The first inverter circuit includes a first inverter and a first switch, and the second inverter circuit includes a second inverter and a second switch. The first terminal of the first inverter and the first terminal of the second inverter are electrically connected to the power supply circuit, the second terminal of the first inverter is electrically connected to the grid connection port through the first switch, and the second terminal of the second inverter is electrically connected to the load port through the second switch.

[0007] The power supply device further includes a third switch and a fourth switch. The second terminal of the first inverter is electrically connected to the grid-connected port in sequence through the first switch and the third switch. The second terminal of the second inverter is electrically connected to the load port in sequence through the second switch and the fourth switch. The first terminal of the current detection circuit is electrically connected between the first switch and the third switch, and the second terminal of the current detection circuit is electrically connected between the second switch and the fourth switch. The control circuit is electrically connected to the first switch, the second switch, the third switch, and the fourth switch, respectively.

[0008] The control circuit is used to control the first switch, the second switch, the third switch and the fourth switch to be turned on, and to control the second power output of the second inverter circuit to decrease until the current information matches the preset current information.

[0009] The grid connection port is electrically connected to the power grid, the electricity meter is electrically connected between the grid connection port and the power grid, and the control circuit is used to control the first switch, the second switch, the third switch and the fourth switch to be turned on;

[0010] When the meter detects current flowing into the grid at the grid connection port and receives a power supply stop message, the control circuit adjusts the first power output of the first inverter circuit until the meter no longer detects current flowing into the grid at the grid connection port.

[0011] The meter is connected to the first inverter circuit and the second inverter circuit respectively, the load port is electrically connected to the load, and the control circuit is used to control the third switch to open, control the fourth switch to open, and control the first switch and / or the second switch to open, so as to control the first inverter circuit and / or the second inverter circuit to be electrically connected to the load.

[0012] The control circuit is used to obtain the fourth power required by the load through the electricity meter, and control the first power output by the first inverter circuit and / or the second power output by the second inverter circuit based on the fourth power.

[0013] Wherein, when the fourth power is less than a preset first power threshold, the control circuit is used to control the first switch to turn on; or,

[0014] When the fourth power is greater than the first power threshold, the control circuit controls the second switch to turn on; or,

[0015] When the fourth power is greater than the preset second power threshold, the control circuit is used to control the first switch and the second switch to be turned on.

[0016] The grid connection port is electrically connected to the power grid, the output power of the grid connection port is greater than the power threshold, the electricity meter is electrically connected between the grid connection port and the power grid, the load port is electrically connected to the load, and the control circuit is used to control the first switch, the second switch, the third switch and the fourth switch to be turned on.

[0017] The control circuit is used to detect the current flowing into the grid through the meter when the current detection circuit stops working, and control the first power output of the first inverter circuit and / or the second power output of the second inverter circuit to decrease until the meter no longer detects the current flowing into the grid through the grid connection port.

[0018] The beneficial effects of this application are as follows: The power supply device of this application includes a control circuit, a power supply, a first inverter circuit, a second inverter circuit, a current detection circuit, a grid connection port, and a load port. The rated power of the second inverter circuit is greater than that of the first inverter circuit, meaning that the first and second inverter circuits can meet loads of different power, increasing the application scenarios of the power supply device and improving the user experience. The control circuit of this application controls the current detection circuit to detect the current information between the first and second inverter circuits. When the current information does not match the acquired preset current information, the second power output of the second inverter circuit is adjusted until the current information matches the preset current information, reducing the probability of the second inverter circuit feeding power to the grid through the grid connection port. This prevents the second inverter circuit with a larger rated output power from feeding power to the grid through the grid connection port, which would not meet the output power requirements of the grid connection port, but at the same time meets the user's needs. It enables the second inverter circuit with a larger rated output power to be connected in parallel with the first inverter circuit with a lower rated output power to carry loads with higher power than the rated output power of the first inverter circuit. That is, by adjusting the second power, the reverse current of the second inverter circuit is reduced, the first inverter circuit can meet the grid demand, and the second inverter circuit can meet the high-power load. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a schematic diagram of the framework of an embodiment of the power supply device provided in this application;

[0021] Figure 2 yes Figure 1 A flowchart illustrating an embodiment of a control method for a power supply device.

[0022] Figure 3 yes Figure 1 A flowchart illustrating another embodiment of the control method for a power supply device.

[0023] Figure 4 This is a schematic diagram of another embodiment of the power supply device provided in this application. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a connection between two components or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] Please see Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the framework of an embodiment of the power supply device provided in this application. Figure 2 yes Figure 1 This is a flowchart illustrating an embodiment of the control method for a power supply device. The power supply device 1 in this embodiment can be applied to household load scenarios, such as when it is installed on a balcony. In other embodiments, the power supply device 1 can be installed in other locations within the house, such as on the roof. Household loads include, but are not limited to, washing machines, dryers, rice cookers, and refrigerators.

[0031] The power supply device 1 includes a power supply circuit 11, a first inverter circuit 12, a second inverter circuit 13, a current detection circuit 14, a grid connection port 15, and a load port 16. The power supply circuit 11 includes, but is not limited to, photovoltaic modules, and can also be a battery power source. The photovoltaic modules are used to directly convert solar energy into electrical energy. The current detection circuit 14 includes, but is not limited to, a current sensor.

[0032] The first terminal of the first inverter circuit 12 and the first terminal of the second inverter circuit 13 are electrically connected to the power supply circuit 11. The second terminal of the first inverter circuit 12 is electrically connected to the grid connection port 15. The second terminal of the second inverter circuit 13 is electrically connected to the grid connection port 15 through the current detection circuit 14, and the second terminal of the second inverter circuit 13 is connected to the load port 16.

[0033] In some embodiments, the grid connection port 15 can be electrically connected to the power grid 2, and the power supply device 1 draws power from the power grid 2 through the grid connection port 15; or, the power supply device 1 feeds power to the power grid 2. The load port 16 can be electrically connected to a load 3, which includes, but is not limited to, high-power household loads.

[0034] It should be noted that in the actual scenario of this invention, the power source 11 can be a photovoltaic power source, a vehicle charging power source, or a battery power source. In one embodiment, the photovoltaic power source in the power source 11 and the first inverter circuit form a power supply device, which can be placed on a balcony and can supply power independently; while the battery power source in the power source 11 and the second inverter circuit 13 form another power supply device, which is not limited in placement and can also supply power independently.

[0035] The first inverter circuit 12 is used to output the first power, and the rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12. For example, the rated power of the first inverter circuit 12 is 800W, and the rated power of the second inverter circuit 13 is 5kW. The rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12, and the rated power of the first inverter 121 meets the grid connection requirements for flowing to the grid 2 through the grid connection port 15.

[0036] The output power of grid connection port 15 is less than a preset power threshold, and the power supply device 1 is electrically connected to the power grid 2 via a socket installation method. Specifically, the output power of the power supply device 1 to grid connection port 15 is less than the power threshold, and the socket installation method means that the power supply device 1 is plugged into a household socket through grid connection port 15. It should be noted that, for safety, electrical performance, and lifespan considerations, household sockets must have a maximum power carrying capacity limit; that is, the output power of grid connection port 15 needs to be less than the preset power threshold to ensure the safety of the household socket. The output power of grid connection port 15 does not mean that grid connection port 15 can only output power, but rather the power flowing through grid connection port 15.

[0037] The control method for the power supply device 1 in this embodiment includes the following steps:

[0038] S101: Current detection circuit 14 detects the current information between the first inverter circuit 12 and the second inverter circuit 13.

[0039] In this embodiment, the second terminal of the second inverter circuit 13 is electrically connected to the grid-connected port 15 via a current detection circuit 14. That is, the current detection circuit 14 is located between the first inverter circuit 12 and the second inverter circuit 13, and controls the current detection circuit 14 to detect the current information between the first inverter circuit 12 and the second inverter circuit 13; the current information includes, but is not limited to, the current direction. In other embodiments, the current information also includes the current value.

[0040] In some embodiments, the current information between the first inverter circuit 12 and the second inverter circuit 13 includes the current direction between the first inverter circuit 12 and the second inverter circuit 13, wherein the current direction between the first inverter circuit 12 and the second inverter circuit 13 includes current flowing from the first inverter circuit 12 to the second inverter circuit 13, or current flowing from the second inverter circuit 13 to the first inverter circuit 12. In other embodiments, the current direction between the first inverter circuit 12 and the second inverter circuit 13 includes current flowing from the grid-connected port 15 to the load port 16, or current flowing from the load port 16 to the grid-connected port 15.

[0041] S102: When the current information does not match the preset current information, the second inverter circuit 13 adjusts the output power until the current information matches the preset current information.

[0042] Assume that the second inverter circuit 13 feeds power to the grid 2 through the grid connection port 15, and the power of the second inverter circuit 13 is greater than the design requirement for power flowing to the grid 2 through the grid connection port 15 (or the power of the second inverter circuit 13 is greater than the power threshold of the grid connection port 15). Therefore, the power supply device 1 is equipped with preset current information. After obtaining the current information, it matches the current information between the first inverter circuit 12 and the second inverter circuit 13 with the preset current information. If the current information does not match the preset current information, the second inverter circuit 13 adjusts its output power until the current information matches the preset current information.

[0043] In some embodiments, the preset current information includes the current direction between the first inverter circuit 12 and the second inverter circuit 13. The current direction between the first inverter circuit 12 and the second inverter circuit 13 flows from the second inverter circuit 13 to the first inverter circuit 12 (i.e., from the load port 16 to the grid connection port 15). If the current information between the first inverter circuit 12 and the second inverter circuit 13 does not match the preset current information, then the second inverter circuit 13 adjusts its output power until the current information matches the preset current information, i.e., the current direction between the first inverter circuit 12 and the second inverter circuit 13 flows from the first inverter circuit 12 to the second inverter circuit 13 (i.e., from the grid connection port 15 to the load port 16), to reduce the probability that the second inverter circuit 13 feeds power to the grid 2 through the grid connection port 15. At this time, the second inverter circuit 13 supplies power to the load 3 electrically connected to the load port 16.

[0044] The power supply device 1 in this embodiment includes a power supply circuit 11, a first inverter circuit 12, a second inverter circuit 13, a current detection circuit 14, a grid connection port 15, and a load port 16. The rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12. That is, the parallel connection between the first inverter circuit 12 and the second inverter circuit 13 can meet the loads 3 of different power, improve the load-carrying capacity of the load port 16 connected to the conventional first inverter circuit 12, increase the application scenarios of the power supply device 1, and enable users to connect the second inverter circuit 13 with the first inverter circuit 12 with a larger rated output power according to their needs to form a power supply device 1 with a larger output power, thereby improving the user experience. In this embodiment, the current detection circuit 14 detects the current information between the first inverter circuit 12 and the second inverter circuit 13. When the current information does not match the preset current information, the second inverter circuit 13 adjusts its output power until the current information matches the preset current information. This reduces the probability of the second inverter circuit 13 feeding power to the grid 2 through the grid connection port 15. In other words, by adjusting the power, the reverse current situation of the second inverter circuit 13 (i.e., power flowing from the second inverter circuit 13 to the grid 2) is reduced. The parallel connection of the first inverter circuit 12 and the second inverter circuit 13 can meet the demand of high-power loads that exceed the rated power output of the first inverter circuit 12. By setting the current detection circuit 14 at the output end between the first inverter circuit 12 and the second inverter circuit 13 to prevent reverse current, the second inverter circuit 13 will not output a large amount of power to the grid 2 through the grid connection port 15, thus failing to meet the output power requirements of the grid connection port 15.

[0045] In some embodiments, the second power output of the second inverter circuit 13 can also be adjusted by adjusting the power distribution between the second inverter circuit 13 and other electrical devices connected thereto, such as increasing the power distribution to the electrical devices connected to the second inverter circuit 13 while reducing the power distribution to the load 3.

[0046] According to some embodiments of this application, step S102 of this embodiment includes: controlling the second power output of the second inverter circuit 13 to decrease until the current information matches the preset current information.

[0047] Specifically, the second power output of the second inverter circuit 13 is reduced to control the second power output of the second inverter circuit 13 to decrease until the current information matches the preset current information.

[0048] According to some embodiments of this application, please refer to Figure 1As shown, in this embodiment, the power supply device 1 is installed on the balcony, and the electricity meter 4 is electrically connected between the grid connection port 15 and the power grid 2. The electricity meter 4 includes, but is not limited to, a household electricity meter. The control method of this embodiment is described based on the control method disclosed in the above embodiments. The control method of this embodiment further includes the following steps: when the electricity meter 4 detects current flowing into the power grid 2 through the grid connection port 15 and the electricity meter 4 receives a stop power supply information, the first power output of the first inverter circuit 12 is adjusted until the electricity meter 4 no longer detects current flowing into the power grid 2 through the grid connection port 15.

[0049] Among them, the meter 4 receives a power supply stop information, for example, the meter 4 receives a power supply stop instruction from the application software; the meter 4 detects the current between the grid connection port 15 and the power grid 2, and when the meter 4 detects that the current of the grid connection port 15 flows into the power grid 2 (that is, the grid connection port 15 has current fed into the power grid 2), it adjusts the first power output of the first inverter circuit 12 until the meter 4 no longer detects the current of the grid connection port 15 flowing into the power grid 2.

[0050] In some embodiments, the first inverter circuit 12 is connected to a photovoltaic power source, and the second inverter circuit 13 is connected to a battery power source. Since the rated output power of the second inverter circuit 13 is greater than the rated output power of the first inverter circuit 12, their parallel connection can increase the range of power requirements for the load connected to the load port. However, in some scenarios, such as when the grid connection port 15 is a household socket, the power flowing into the grid from the power supply device 1 formed by the free combination of the first inverter circuit 12 and the second inverter circuit 13 is limited. For example, only when the first inverter circuit 12 allows power to be supplied to the grid 2 through the grid connection port 15 can power be supplied. Therefore, in this embodiment, a current detection circuit 14 is set between the second inverter circuit 13 and the first inverter circuit 12. When the current information detected by the current detection circuit 14 does not match the preset current information, the second inverter circuit 13 adjusts its output power so that it can only supply power to the load and cannot flow to the grid 2 through the grid connection port 15, thus meeting the design requirements of the grid connection port 15. Meanwhile, since the first inverter circuit 12 is connected to clean photovoltaic energy, which is usually made full use of by users, if the user or the grid allows it and there is a lot of photovoltaic energy, the photovoltaic power can supply power not only to the load port 16, but also to the grid 2. At this time, the power supply can be detected and controlled by the meter 4.

[0051] In some embodiments, the step of meter 4 detecting current flowing into the grid 2 from grid connection port 15 includes: meter 4 detecting a third power, i.e., meter 4 detecting a third power between grid connection port 15 and grid 2; for example, the third power of meter 4 may represent the electrical energy generated by power supply device 1 per unit time. Meter 4 may be used to display the third power, or the third power may be read directly from meter 4. In response to the third power being greater than zero, it is determined that current flows into the grid 2 from grid connection port 15. In response to the third power being equal to zero, it is determined that meter 4 has not detected current flowing into the grid 2 from grid connection port 15.

[0052] In some embodiments, the step of adjusting the first power output of the first inverter circuit 12 until the meter 4 does not detect current flowing into the grid 2 from the grid connection port 15 includes: controlling the first power output of the first inverter circuit 12 to decrease until the third power detected by the meter 4 is equal to zero.

[0053] In this embodiment, when the current information does not match the acquired preset current information, the second power output of the second inverter circuit 13 is adjusted until the current information matches the preset current information, that is, the current direction between the first inverter circuit 12 and the second inverter circuit 13 flows from the first inverter circuit 12 to the second inverter circuit 13; when the meter 4 detects the current flowing into the grid 2 from the grid connection port 15 and the meter 4 receives the stop power supply information, the first power output of the first inverter circuit 12 is adjusted until the meter 4 no longer detects the current flowing into the grid 2 from the grid connection port 15; through the above method, the first inverter circuit 12 can stop supplying power to the grid 2.

[0054] According to some embodiments of this application, please refer to Figure 1 and Figure 3 As shown, Figure 3 yes Figure 1 A flowchart illustrating another embodiment of the control method for the power supply device. The control method in this embodiment is described based on the control method disclosed in the above embodiments. In this embodiment, the meter 4 is connected to the first inverter circuit 12 and the second inverter circuit 13 respectively; for example, the meter 4 is communicatively connected to the first inverter circuit 12 and the second inverter circuit 13 respectively, or the meter 4 is electrically connected to the first inverter circuit 12 and the second inverter circuit 13 respectively.

[0055] The control method in this embodiment also includes the following steps.

[0056] S201: When the first inverter circuit 12 and the second inverter circuit 13 are disconnected from the power grid 2, the first inverter circuit 12 and / or the second inverter circuit 13 are controlled to be electrically connected to the load 3.

[0057] When the first inverter circuit 12 and the second inverter circuit 13 are disconnected from the power grid 2, that is, when the power supply device 1 is disconnected from the power grid 2, or when the grid connection port 15 is disconnected from the power grid 2, the current detection circuit 14 does not work.

[0058] Control the first inverter circuit 12 and / or the second inverter circuit 13 to be electrically connected to the load 3; wherein, control the first inverter circuit 12 to be electrically connected to the load 3; or, control the second inverter circuit 13 to be electrically connected to the load 3; or, control the first inverter circuit 12 and the second inverter circuit 13 to be electrically connected to the load 3.

[0059] S202: Obtain the fourth power required by the load 3 through the meter 4, and control the first power output by the first inverter circuit 12 and / or the second power output by the second inverter circuit 13 based on the fourth power.

[0060] Meter 4 obtains the fourth power required by load 3, for example, meter 4 obtains the fourth power required by load port 16.

[0061] The first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 are controlled based on the fourth power control. Specifically, when the first inverter circuit 12 is electrically connected to the load 3, the first power output of the first inverter circuit 12 is controlled based on the fourth power control; when the second inverter circuit 13 is electrically connected to the load 3, the second power output of the second inverter circuit 13 is controlled based on the fourth power control; and when both the first inverter circuit 12 and the second inverter circuit 13 are electrically connected to the load 3, the first power output of the first inverter circuit 12 and the second power output of the second inverter circuit 13 are controlled based on the fourth power control.

[0062] In this embodiment, when the first inverter circuit 12 and the second inverter circuit 13 are disconnected from the power grid 2, the first inverter circuit 12 and / or the second inverter circuit 13 are controlled to be electrically connected to the load 3. The fourth power required by the load 3 is obtained through the meter 4, and the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 are controlled based on the fourth power. This can achieve the fourth power required by the load 3, so as to control the operation of the first inverter circuit 12 and / or the second inverter circuit 13 according to the needs of the load 3. The first inverter circuit 12 and the second inverter circuit 13 can meet the loads 3 with different power, increase the application scenarios of the power supply device 1, and improve the user experience.

[0063] According to some embodiments of this application, step S201 of this embodiment includes the following steps: when the fourth power is less than a preset first power threshold, the first inverter circuit 12 is electrically connected to the load 3; or, when the fourth power is greater than the first power threshold, the second inverter circuit 13 is electrically connected to the load 3; or, when the fourth power is greater than a preset second power threshold, the first inverter circuit 12 and the second inverter circuit 13 are electrically connected to the load 3.

[0064] A first power threshold and a second power threshold are preset, with the second power threshold being greater than the first power threshold. When the fourth power is less than the preset first power threshold, the first inverter circuit 12 is electrically connected to the load 3. Alternatively, when the fourth power is greater than the first power threshold, the second inverter circuit 13 is electrically connected to the load 3. Or, when the fourth power is greater than the preset second power threshold, the first inverter circuit 12 and the second inverter circuit 13 are electrically connected to the load 3.

[0065] According to some embodiments of this application, in this embodiment, the grid connection port 15 is electrically connected to the power grid 2, the output power of the grid connection port 15 is greater than the power threshold, the meter 4 is electrically connected between the grid connection port 15 and the power grid 2, and the load port 16 is electrically connected to the load 3.

[0066] In this configuration, grid connection port 15 is electrically connected to power grid 2, meaning that power supply device 1 is connected to power grid 2. The output power of grid connection port 15 exceeds the power threshold. Power supply device 1 is electrically connected to power grid 2 via a distribution box installation method. Specifically, the output power of power supply device 1 to grid connection port 15 exceeds the power threshold. The distribution box installation method means that power supply device 1 is connected to power grid 2 via a household or user-configured distribution box, with grid connection port 15 replaced by the distribution box. It should be noted that the design of household distribution boxes allows for an output power greater than that of household sockets.

[0067] In some embodiments, the power supply device 1 is connected to the power grid 2 through a household distribution box, so that the power supply device 1 does not limit the output power of the grid connection port 15 (i.e., the household distribution box), and therefore the output power of the grid connection port 15 can be less than or equal to the power threshold.

[0068] The control method of this embodiment further includes the following steps: when the grid connection port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 detects the current flowing into the power grid 2 from the grid connection port 15, and when the meter 4 receives the power supply stop information, the first power output by the first inverter circuit 12 and / or the second power output by the second inverter circuit 13 are controlled to decrease until the meter 4 no longer detects the current flowing into the power grid 2 from the grid connection port 15.

[0069] In some embodiments, when the grid connection port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 receives the power supply stop information, and when the meter 4 detects that the current from the grid connection port 15 flows into the power grid 2, it controls the first power output of the first inverter circuit 12 to decrease until the meter 4 no longer detects the current from the grid connection port 15 flowing into the power grid 2.

[0070] In some embodiments, when the grid connection port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 receives the power supply stop information, and when the meter 4 detects that the current from the grid connection port 15 flows into the power grid 2, it controls the second power output of the second inverter circuit 13 to decrease until the meter 4 no longer detects the current from the grid connection port 15 flowing into the power grid 2.

[0071] In some embodiments, when the grid connection port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 receives the power supply stop information, and when the meter 4 detects that the current from the grid connection port 15 flows into the power grid 2, it controls the first power output of the first inverter circuit 12 to decrease and the second power output of the second inverter circuit 13 to decrease until the meter 4 no longer detects the current from the grid connection port 15 flowing into the power grid 2.

[0072] In this embodiment, by electrically connecting the grid-connected port 15 to the power grid 2, the current detection circuit 14 stops working. When the meter 4 detects current flowing into the power grid 2 through the grid-connected port 15 and receives a power supply stop information, it controls the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 to decrease until the meter 4 no longer detects current flowing into the power grid 2 through the grid-connected port 15. This allows for adjustment of the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 to meet the load power requirements of different scenarios and improve the user experience.

[0073] According to some embodiments of this application, the control method of this embodiment further includes the following steps: when the first inverter circuit 12 and the second inverter circuit 13 are disconnected from the power grid 2, the first inverter circuit 12 and / or the second inverter circuit 13 are controlled to be electrically connected to the load 3.

[0074] When the power supply device 1 is electrically connected to the power grid 2 through the distribution box installation method, and the first inverter circuit 12 and the second inverter circuit 13 are disconnected from the power grid 2, that is, when the power supply device 1 is disconnected from the power grid 2 in the distribution box installation method, the current detection circuit 14 does not work.

[0075] Control the first inverter circuit 12 and / or the second inverter circuit 13 to be electrically connected to the load 3; wherein, control the first inverter circuit 12 to be electrically connected to the load 3; or, control the second inverter circuit 13 to be electrically connected to the load 3; or, control the first inverter circuit 12 and the second inverter circuit 13 to be electrically connected to the load 3.

[0076] The control method in this embodiment further includes the following steps: obtaining the fourth power required by the load 3 through the meter 4, and controlling the first power output by the first inverter circuit 12 and / or the second power output by the second inverter circuit 13 based on the fourth power. This is the same as step S202 described above, and will not be repeated here.

[0077] This application also provides a power supply device 1, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of another embodiment of the power supply device 1 provided in this application. The power supply device 1 of this embodiment can be applied to household load scenarios, such as installing the power supply device 1 on a balcony. In other implementations, the power supply device 1 can be installed in other locations within the house, such as the roof. Household loads include, but are not limited to, washing machines, dryers, rice cookers, and refrigerators.

[0078] The power supply device 1 in this embodiment includes a control circuit 21, a power supply circuit 11, a first inverter circuit 12, a second inverter circuit 13, a current detection circuit 14, a grid connection port 15, and a load port 16. The power supply circuit 11 includes, but is not limited to, a photovoltaic module, and can also be a battery power source. The photovoltaic module is used to directly convert solar energy into electrical energy. The current detection circuit 14 includes, but is not limited to, a current sensor, and can be other integrated circuits used for current detection.

[0079] The first terminal of the first inverter circuit 12 and the first terminal of the second inverter circuit 13 are electrically connected to the power supply circuit 11. The second terminal of the first inverter circuit 12 is electrically connected to the grid connection port 15. The second terminal of the second inverter circuit 13 is electrically connected to the second terminal of the first inverter circuit 12 through the current detection circuit 14. The second terminal of the second inverter circuit 13 is connected to the load port 16. The output power of the grid connection port 15 is less than a preset power threshold. The rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12. The first inverter circuit 12 is used to output the first power. The control circuit 21 is electrically connected to the current detection circuit 14, the first inverter circuit 12 and the second inverter circuit 13 respectively.

[0080] In some embodiments, the grid connection port 15 can be electrically connected to the power grid 2, and the power supply device 1 draws power from the power grid 2 through the grid connection port 15; or, the power supply device 1 feeds power to the power grid 2. The load port 16 can be electrically connected to a load 3, which includes, but is not limited to, high-power household loads.

[0081] The first inverter circuit 12 is used to output the first power, and the rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12. For example, the rated power of the first inverter circuit 12 is 800W, and the rated power of the second inverter circuit 13 is 5kW. The rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12, and the rated power of the first inverter 121 meets the grid connection requirements for flowing to the grid 2 through the grid connection port 15.

[0082] The output power of the grid connection port 15 is less than the preset power threshold, and the power supply device 1 is electrically connected to the power grid 2 through a socket installation method. Specifically, the output power of the power supply device 1 to the grid connection port 15 is less than the power threshold, and the socket installation method means that the power supply device 1 is plugged into a household socket through the grid connection port 15.

[0083] The control circuit 21 is used to control the current detection circuit 14 to detect the current information between the first inverter circuit 12 and the second inverter circuit 13; when the current information does not match the acquired preset current information, the second power output by the second inverter circuit 13 is adjusted until the current information matches the preset current information.

[0084] In this embodiment, the second terminal of the second inverter circuit 13 is electrically connected to the grid-connected port 15 via a current detection circuit 14. That is, the current detection circuit 14 is located between the first inverter circuit 12 and the second inverter circuit 13, and controls the current detection circuit 14 to detect the current information between the first inverter circuit 12 and the second inverter circuit 13; the current information includes, but is not limited to, the current direction. In other embodiments, the current information also includes the current value.

[0085] In some embodiments, the current information between the first inverter circuit 12 and the second inverter circuit 13 includes the current direction between the first inverter circuit 12 and the second inverter circuit 13, wherein the current direction between the first inverter circuit 12 and the second inverter circuit 13 includes current flowing from the first inverter circuit 12 to the second inverter circuit 13, or current flowing from the second inverter circuit 13 to the first inverter circuit 12. In other embodiments, the current direction between the first inverter circuit 12 and the second inverter circuit 13 includes current flowing from the grid-connected port 15 to the load port 16, or current flowing from the load port 16 to the grid-connected port 15.

[0086] Assume that the second inverter circuit 13 feeds power to the grid 2 through the grid connection port 15, and the power of the second inverter circuit 13 is greater than the design requirement for power flowing to the grid 2 through the grid connection port 15 (or the power of the second inverter circuit 13 is greater than the power threshold of the grid connection port 15). Therefore, the power supply device 1 is equipped with preset current information. The control circuit 21 is used to acquire the preset current information after acquiring the current information, and match the current information between the first inverter circuit 12 and the second inverter circuit 13 with the preset current information. When the current information does not match the preset current information, the control circuit 21 is used to adjust the second power output of the second inverter circuit 13 until the current information matches the preset current information.

[0087] The control circuit 21 can be an existing integrated circuit. The integrated circuit includes at least one signal port for receiving current information and also includes a comparison circuit. One end of the comparison circuit is connected to the signal port for receiving current information, and the other end of the comparison circuit is connected to the port for receiving preset current information. Finally, the output of the comparison circuit is used to output an electrical signal indicating that the received current information does not match the preset current information, i.e., a control signal.

[0088] The second inverter circuit 13 includes at least an AC / DC circuit and may also include an MCU that controls the AC / DC circuit. The MCU in the second inverter circuit 13 has the function of controlling the switching transistors in the AC / DC circuit and also has the function of interacting with external signals. Therefore, the MCU in this application can control the switching transistors of the AC / DC circuit after receiving the control command sent by the control circuit 21, so as to adjust the second power output of the second inverter circuit 13.

[0089] Of course, in actual use, the second inverter circuit 13 may also be connected to other electrical devices, not limited to the load 3. The second inverter circuit 13 can adjust the power distribution to other electrical devices and the load 3. For example, the output power of the second inverter circuit 13 remains unchanged, but the power to other electrical devices is increased until the current information detected by the current detection circuit 14 is consistent with the preset current information.

[0090] In addition, in some other embodiments, the MCU and control circuit 21 of the second inverter circuit 13 may be the same integrated control circuit, which may be integrated into the second inverter circuit 13, or integrated into the first inverter circuit 12, or integrated into other terminal devices (not shown). There are no limitations here. Those skilled in the art can set it according to their needs, and it will not be described in detail here.

[0091] In some embodiments, the preset current information includes the current direction between the first inverter circuit 12 and the second inverter circuit 13. The current direction between the first inverter circuit 12 and the second inverter circuit 13 flows from the second inverter circuit 13 to the first inverter circuit 12 (i.e., from the load port 16 to the grid connection port 15). If the current information between the first inverter circuit 12 and the second inverter circuit 13 does not match the preset current information, the control circuit 21 adjusts the second power output of the second inverter circuit 13 until the current information matches the preset current information, i.e., the current direction between the first inverter circuit 12 and the second inverter circuit 13 flows from the first inverter circuit 12 to the second inverter circuit 13 (i.e., from the grid connection port 15 to the load port 16), thereby reducing the probability that the second inverter circuit 13 feeds power to the grid 2 through the grid connection port 15. At this time, the second inverter circuit 13 supplies power to the load 3 electrically connected to the load port 16.

[0092] In some embodiments, adjusting the power of the second inverter circuit 13 may also involve adjusting the power distribution between the second inverter circuit 13 and other electrical devices connected thereto, for example, increasing the power distributed to the electrical devices connected to the second inverter circuit 13 while reducing the second power supplied to the load 3.

[0093] The power supply device 1 in this embodiment includes a power supply circuit 11, a first inverter circuit 12, a second inverter circuit 13, a current detection circuit 14, a grid connection port 15, a load port 16, and a control circuit 21. The rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12. That is, the parallel connection between the first inverter circuit 12 and the second inverter circuit 13 can meet the loads 3 of different power, improve the load-carrying capacity of the load connection port of the conventional first inverter circuit, increase the application scenarios of the power supply device 1, and enable users to connect the second inverter circuit 13 with the first inverter circuit 12 with a larger rated output power according to their needs to form a power supply device 1 with a larger output power, thereby improving the user experience. In this embodiment, the control circuit 21 is used to control the current detection circuit 14 to detect the current information between the first inverter circuit 12 and the second inverter circuit 13. When the current information does not match the acquired preset current information, the second power output of the second inverter circuit 13 is adjusted until the current information matches the preset current information, thereby reducing the probability of the second inverter circuit 13 feeding power to the grid 2 through the grid connection port 15. That is, by adjusting the second power, the reverse current situation of the second inverter circuit 13 (i.e., the current flows from the second inverter circuit 13 to the grid 2) is reduced. The parallel connection of the first inverter circuit 12 and the second inverter circuit 13 can meet the demand of high-power loads that exceed the rated power output of the first inverter circuit 12. By setting the current detection circuit 14 at the output end between the first inverter circuit 12 and the second inverter circuit 13 to prevent reverse current, the second inverter circuit 13 will not output a large second power through the grid connection port 15 to the grid 2, so as not to meet the output power demand of the grid connection port 15.

[0094] According to some embodiments of this application, the first inverter circuit 12 includes a first inverter 121 and a first switch 122, the second inverter circuit 13 includes a second inverter 131 and a second switch 132, and the power supply device 1 further includes a third switch 22 and a fourth switch 23. The rated power of the first inverter circuit 12 is the rated power of the first inverter 121, and the first power output by the first inverter circuit 12 is the first power output by the first inverter 121; the rated power of the second inverter circuit 13 is the rated power of the second inverter 131, and the second power output by the second inverter circuit 13 is the second power output by the second inverter 131.

[0095] The first terminal of the first inverter 121 and the first terminal of the second inverter 131 are electrically connected to the power supply circuit 11, respectively. The second terminal of the first inverter 121 is electrically connected to the grid connection port 15 through the first switch 122 and the third switch 22. The second terminal of the second inverter 131 is electrically connected to the load port 16 through the second switch 132 and the fourth switch 23. The first terminal of the current detection circuit 14 is electrically connected between the first switch 122 and the third switch 22, and the second terminal of the current detection circuit 14 is electrically connected between the second switch 132 and the fourth switch 23.

[0096] The first inverter 121 can be an AC / DC circuit, and the second inverter 131 can be another AC / DC circuit. It is understood that the AC / DC circuits have different rated output power due to different circuit designs, such as different selection of switching transistors, in order to meet different power needs.

[0097] The control circuit 21 is electrically connected to the first switch 122, the second switch 132, the third switch 22 and the fourth switch 23 respectively. The control circuit 21 is used to control the first switch 122, the second switch 132, the third switch 22 and the fourth switch 23 to be turned on or off.

[0098] In this embodiment, the control circuit 21 controls the first switch 122, the second switch 132, the third switch 22 and the fourth switch 23 to turn on or off, so as to switch the application scenarios of the power supply device 1, increase the application scenarios of the power supply device 1 under different power loads, and improve the user experience.

[0099] According to some embodiments of this application, the control circuit 21 of this embodiment is used to control the first switch 122, the second switch 132, the third switch 22 and the fourth switch 23 to be turned on, and to control the second power output of the second inverter circuit 13 to be reduced until the current information matches the preset current information.

[0100] Control circuit 21 is used to control the conduction of the first switch 122, the second switch 132, the third switch 22, and the fourth switch 23. Specifically, the first inverter 121 is electrically connected to the grid connection port 15 via the first switch 122 and the third switch 22; the second inverter 131 is electrically connected to the grid connection port 15 via the second switch 132 and the third switch 22; and the second inverter 131 is electrically connected to the load port 16 via the second switch 132 and the fourth switch 23. Control circuit 21 also controls the reduction of the second power output of the second inverter circuit 13 until the current information matches the preset current information.

[0101] In this embodiment, the control circuit 21 is used to control the first switch 122, the second switch 132, the third switch 22, and the fourth switch 23 to be turned on, and to control the second power output of the second inverter circuit 13 to decrease until the current information matches the preset current information, so as to reduce the probability of the second inverter circuit 13 feeding power to the grid 2 through the grid connection port 15. That is, by controlling the second power to decrease, the reverse current situation of the second inverter circuit 13 (i.e., the current flows from the second inverter circuit 13 to the grid connection port 15 and then to the grid 2) is reduced. The parallel connection of the first inverter circuit 12 and the second inverter circuit 13 can meet the demand of high-power loads that exceed the rated power output of the first inverter circuit 12. By setting a current detection circuit 14 at the output end between the first inverter circuit 12 and the second inverter circuit 13 to prevent reverse current, the second inverter circuit 13 will not output a large second power output to the grid 2 through the grid connection port 15, so as not to meet the output power demand of the grid connection port 15.

[0102] According to some embodiments of this application, in this embodiment, the grid connection port 15 is electrically connected to the power grid 2, the meter 4 is electrically connected between the grid connection port 15 and the power grid 2, the control circuit 21 is used to control the first switch 122, the second switch 132, the third switch 22 and the fourth switch 23 to be turned on, and the first inverter circuit 12 feeds power to the power grid 2.

[0103] When meter 4 detects current flowing into grid 2 from grid connection port 15 and receives a power supply stop message, control circuit 21 adjusts the first power output of first inverter circuit 12 until meter 4 no longer detects current flowing into grid 2 from grid connection port 15.

[0104] Among them, the meter 4 receives a power supply stop information, for example, the meter 4 receives a power supply stop instruction from the application software; the meter 4 detects the current between the grid connection port 15 and the power grid 2. When the meter 4 detects that the current of the grid connection port 15 flows into the power grid 2 (that is, the grid connection port 15 has current fed into the power grid 2), the control circuit 21 is used to adjust the first power output of the first inverter circuit 12 until the meter 4 no longer detects the current of the grid connection port 15 flowing into the power grid 2.

[0105] It should be noted that whether the power supply device 1 can supply power to the power grid 2 in the actual use of this application is designed according to the user's needs, and the user can set it himself.

[0106] In some embodiments, the third power detected by the meter 4 refers to the third power between the grid connection port 15 and the power grid 2; for example, the third power of the meter 4 can represent the electrical energy generated by the power supply device 1 per unit time. The meter 4 can be used to display the third power, or the third power can be read directly from the meter 4.

[0107] In some embodiments, the control circuit 21 is used to control the first power output of the first inverter circuit 12 to decrease until the third power detected by the meter 4 is equal to zero. The process of controlling the decrease of the first power output of the first inverter circuit 12 can be linear or nonlinear, staged control, and is not limited here.

[0108] In this embodiment, when the current information does not match the acquired preset current information, the control circuit 21 adjusts the second power output of the second inverter circuit 13 until the current information matches the preset current information, that is, the current direction between the first inverter circuit 12 and the second inverter circuit 13 flows from the first inverter circuit 12 to the second inverter circuit 13; when the meter 4 detects the current flowing into the grid 2 from the grid connection port 15 and the meter 4 receives the stop power supply information, the control circuit 21 adjusts the first power output of the first inverter circuit 12 until the meter 4 no longer detects the current flowing into the grid 2 from the grid connection port 15; through the above method, the first inverter circuit 12 can stop supplying power to the grid 2.

[0109] It should be noted that whether the power supply device 1 can supply power to the power grid 2 in the actual use of this application is designed according to the user's needs, and the user can set it himself.

[0110] According to some embodiments of this application, in this embodiment, the electricity meter 4 is connected to the first inverter circuit 12 and the second inverter circuit 13 respectively; for example, the electricity meter 4 is communicatively connected to the first inverter circuit 12 and the second inverter circuit 13 respectively, or the electricity meter 4 is electrically connected to the first inverter circuit 12 and the second inverter circuit 13 respectively. In this embodiment, the control circuit 21 is also connected to the electricity meter 4, and the load port 16 is connected to the load 3. It should be noted that the control circuit 21 can be electrically connected to the electricity meter 4 or communicatively connected.

[0111] The control circuit 21 is used to control the third switch 22 to open and the fourth switch 23 to open. At this time, when the first inverter circuit 12 and the second inverter circuit 13 are disconnected from the power grid 2, that is, when the power supply device 1 is disconnected from the power grid 2, or when the grid connection port 15 is disconnected from the power grid 2, the current detection circuit 14 does not work.

[0112] The control circuit 21 is used to control the first switch 122 and / or the second switch 132 to be turned on, so as to control the first inverter circuit 12 and / or the second inverter circuit 13 to be electrically connected to the load 3.

[0113] Specifically, control circuit 21 controls the first switch 122 to be turned on, thereby connecting the first inverter circuit 12 to the load 3, i.e., the first inverter 121 is electrically connected to the load 3 through the first switch 122 and the fourth switch 23. Alternatively, control circuit 21 controls the second switch 132 to be turned on, thereby connecting the second inverter circuit 13 to the load 3, i.e., the second inverter 131 is electrically connected to the load 3 through the second switch 132 and the fourth switch 23. Alternatively, control circuit 21 controls the first switch 122 and the second switch 132 to be turned on, thereby connecting the first inverter circuit 12 and the second inverter circuit 13 to the load 3.

[0114] The control circuit 21 obtains the fourth power required by the load 3 through the meter 4, and controls the first power output by the first inverter circuit 12 and / or the second power output by the second inverter circuit 13 based on the fourth power.

[0115] The control circuit 21 obtains the fourth power required by the load 3 through the meter 4, for example, the meter 4 obtains the fourth power required by the load port 16.

[0116] Control circuit 21 is used to control the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 based on a fourth power control, i.e., to control the first power of the first inverter 121 and / or the second power of the second inverter 131. Specifically, when the first inverter circuit 12 is electrically connected to the load 3, control circuit 21 controls the first power output of the first inverter circuit 12 based on the fourth power control, i.e., to control the first power of the first inverter 121. When the second inverter circuit 13 is electrically connected to the load 3, control circuit 21 controls the second power output of the second inverter circuit 13 based on the fourth power control, i.e., to control the second power of the second inverter 131. When both the first inverter circuit 12 and the second inverter circuit 13 are electrically connected to the load 3, control circuit 21 controls the first power output of the first inverter circuit 12 and the second power output of the second inverter circuit 13 based on the fourth power control.

[0117] In this embodiment, the control circuit 21 is used to control the first switch 122 and / or the second switch 132 to be turned on, so as to control the first inverter circuit 12 and / or the second inverter circuit 13 to be electrically connected to the load 3. The control circuit 21 obtains the fourth power required by the load 3 through the meter 4, and controls the first power output by the first inverter circuit 12 and / or the second power output by the second inverter circuit 13 based on the fourth power. The first inverter circuit 12 and the second inverter circuit 13 can meet the needs of loads 3 with different power, increasing the application scenarios of the power supply device 1 and improving the user experience.

[0118] According to some embodiments of this application, when the fourth power is less than a preset first power threshold, the control circuit 21 is used to control the first switch 122 to be turned on, so as to control the first inverter circuit 12 to be electrically connected to the load 3, that is, the first inverter 121 is electrically connected to the load 3.

[0119] The control circuit 21 can be preset with a first power threshold and a second power threshold, wherein the second power threshold is greater than the first power threshold.

[0120] When the fourth power is greater than the first power threshold, the control circuit 21 is used to turn on the second switch 132 to control the second inverter circuit 13 to be electrically connected to the load 3, that is, the second inverter 131 is electrically connected to the load 3.

[0121] When the fourth power is greater than the preset second power threshold, the control circuit 21 is used to control the first switch 122 and the second switch 132 to be turned on, so as to control the first inverter circuit 12 and the second inverter circuit 13 to be electrically connected to the load 3, that is, the first inverter 121 and the second inverter 131 are electrically connected to the load 3.

[0122] According to some embodiments of this application, in this embodiment, the grid connection port 15 is electrically connected to the power grid 2, the output power of the grid connection port 15 is greater than the power threshold, the meter 4 is electrically connected between the grid connection port 15 and the power grid 2, and the load port 16 is electrically connected to the load 3.

[0123] In this configuration, grid connection port 15 is electrically connected to power grid 2, meaning that power supply unit 1 is connected to power grid 2. The output power of grid connection port 15 exceeds the power threshold, and power supply unit 1 is electrically connected to power grid 2 via a distribution box installation method. Specifically, the output power of power supply unit 1 to grid connection port 15 exceeds the power threshold; the distribution box installation method means that grid connection port 15 is replaced by a distribution box, and power supply unit 1 is connected to power grid 2 through the distribution box. It should be noted that the design of household distribution boxes allows for an output power greater than the output power of household sockets.

[0124] In some embodiments, grid connection port 15 can be replaced by other devices, such as power supply device 1 connected to the power grid through a household distribution box. The household distribution box does not limit the power of power supply device 1 flowing into the power grid 2, so the output power of grid connection port 15 can be greater than or equal to the power threshold.

[0125] The control circuit 21 is also used to control the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 to decrease when the current detection circuit 14 stops working, based on the current flow into the grid 2 detected by the meter 4 at the grid connection port 15, until the meter 4 no longer detects the current flow into the grid 2 at the grid connection port 15.

[0126] In some embodiments, when the grid connection port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 receives the power supply stop information, and when the meter 4 detects that the current from the grid connection port 15 flows into the power grid 2, the control circuit 21 is used to control the first power output of the first inverter circuit 12 to decrease, that is, to control the first power output of the first inverter 121 to decrease, until the meter 4 no longer detects the current from the grid connection port 15 flowing into the power grid 2.

[0127] In some embodiments, when the grid connection port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 receives the power supply stop information, and when the meter 4 detects that the current from the grid connection port 15 flows into the power grid 2, the control circuit 21 controls the second power output of the second inverter circuit 13 to decrease, that is, controls the second power output of the second inverter 131 to decrease, until the meter 4 no longer detects the current from the grid connection port 15 flowing into the power grid 2.

[0128] In some embodiments, when the grid-connected port 15 is electrically connected to the power grid 2, the current detection circuit 14 stops working, the meter 4 receives the power supply stop information, and when the meter 4 detects that the current from the grid-connected port 15 flows into the power grid 2, the control circuit 21 controls the first power output of the first inverter circuit 12 to decrease and the second power output of the second inverter circuit 13 to decrease until the meter 4 no longer detects the current from the grid-connected port 15 flowing into the power grid 2.

[0129] In this embodiment, the control circuit 21 is also used to, when the current detection circuit 14 stops working, detect the current flowing into the grid 2 through the meter 4 at the grid connection port 15, and control the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 to decrease until the meter 4 no longer detects the current flowing into the grid 2 through the grid connection port 15. This allows for adjustment of the first power output of the first inverter circuit 12 and / or the second power output of the second inverter circuit 13 to meet the power requirements of different loads, enabling users to handle higher loads and meet the user's need to combine inverter circuits arbitrarily to form new power supply devices, thus improving the user experience.

[0130] According to some embodiments of this application, the power supply device 1 of this embodiment further includes an energy storage unit 17, which is electrically connected to the first terminal of the first inverter circuit 12 and the first terminal of the second inverter circuit 13.

[0131] The energy storage unit 17 includes, but is not limited to, a battery, and is used to store electrical energy. When the first inverter circuit 12 and / or the second inverter circuit 13 supply power to the load 3, under the condition that the load 3 is operating normally, the energy storage unit 17 is used to store the excess power of the power supply circuit 11.

[0132] In summary, the power supply device 1 of this application includes a power supply circuit 11, a first inverter circuit 12, a second inverter circuit 13, a current detection circuit 14, a grid connection port 15, a load port 16, and a control circuit 21. The rated power of the second inverter circuit 13 is greater than the rated power of the first inverter circuit 12. That is, the first inverter circuit 12 and the second inverter circuit 13 can meet the loads 3 of different power, increasing the application scenarios of the power supply device 1 and improving the user experience. In this embodiment, the control circuit 21 is used to control the current detection circuit 14 to detect the current information between the first inverter circuit 12 and the second inverter circuit 13. When the current information does not match the acquired preset current information, the second power output of the second inverter circuit 13 is adjusted until the current information matches the preset current information, thereby reducing the probability of the second inverter circuit 13 feeding power to the grid 2 through the grid connection port 15. That is, by adjusting the second power, the reverse current situation of the second inverter circuit 13 (i.e., the current flows from the second inverter circuit 13 to the grid 2) is reduced. The parallel connection of the first inverter circuit 12 and the second inverter circuit 13 can meet the demand of high-power loads that exceed the rated power output of the first inverter circuit 12. By setting the current detection circuit 14 at the output end between the first inverter circuit 12 and the second inverter circuit 13 to prevent reverse current, the second inverter circuit 13 will not output a large second power through the grid connection port 15 to the grid 2, so as not to meet the output power requirements of the grid connection port.

[0133] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power supply device, characterized in that, The system includes a control circuit, a power supply circuit, a first inverter circuit, a second inverter circuit, a current detection circuit, a grid connection port, and a load port. The first terminals of the first and second inverter circuits are electrically connected to the power supply circuit. The second terminal of the first inverter circuit is electrically connected to the grid connection port. The second terminal of the second inverter circuit is electrically connected to the grid connection port via the current detection circuit. The output power of the grid connection port is less than a preset power threshold. The second terminal of the second inverter circuit is connected to the load port. The rated power of the second inverter circuit is greater than the rated power of the first inverter circuit. The first inverter circuit is used to output a first power. The control circuit is electrically connected to the current detection circuit, the first inverter circuit, and the second inverter circuit, respectively. The control circuit is used to control the current detection circuit to detect the current information between the first inverter circuit and the second inverter circuit; when the current information does not match the acquired preset current information, the second power output by the second inverter circuit is adjusted until the current information matches the preset current information.

2. The power supply device according to claim 1, characterized in that, The first inverter circuit includes a first inverter and a first switch, and the second inverter circuit includes a second inverter and a second switch. The first terminal of the first inverter and the first terminal of the second inverter are respectively electrically connected to the power supply circuit. The second terminal of the first inverter is electrically connected to the grid-connected port through the first switch, and the second terminal of the second inverter is electrically connected to the load port through the second switch.

3. The power supply device according to claim 2, characterized in that, The power supply device further includes a third switch and a fourth switch. The second terminal of the first inverter is electrically connected to the grid-connected port in sequence through the first switch and the third switch. The second terminal of the second inverter is electrically connected to the load port in sequence through the second switch and the fourth switch. The first terminal of the current detection circuit is electrically connected between the first switch and the third switch, and the second terminal of the current detection circuit is electrically connected between the second switch and the fourth switch. The control circuit is electrically connected to the first switch, the second switch, the third switch, and the fourth switch, respectively.

4. The power supply device according to claim 3, characterized in that, The control circuit is used to control the first switch, the second switch, the third switch and the fourth switch to be turned on, and to control the second power output of the second inverter circuit to decrease until the current information matches the preset current information.

5. The power supply device according to claim 3, characterized in that, The grid connection port is electrically connected to the power grid, the electricity meter is electrically connected between the grid connection port and the power grid, and the control circuit is used to control the first switch, the second switch, the third switch and the fourth switch to be turned on; When the meter detects current flowing into the grid at the grid connection port and receives a power supply stop message, the control circuit adjusts the first power output of the first inverter circuit until the meter no longer detects current flowing into the grid at the grid connection port.

6. The power supply device according to claim 5, characterized in that, The meter is connected to the first inverter circuit and the second inverter circuit respectively. The load port is electrically connected to the load. The control circuit is used to control the third switch to open, control the fourth switch to open, and control the first switch and / or the second switch to open, so as to control the first inverter circuit and / or the second inverter circuit to be electrically connected to the load.

7. The power supply device according to claim 6, characterized in that, The control circuit is used to obtain the fourth power required by the load through the meter, and control the first power output by the first inverter circuit and / or the second power output by the second inverter circuit based on the fourth power.

8. The power supply device according to claim 7, characterized in that, When the fourth power is less than a preset first power threshold, the control circuit controls the first switch to turn on; or, When the fourth power is greater than the first power threshold, the control circuit controls the second switch to turn on; or, When the fourth power is greater than the preset second power threshold, the control circuit is used to control the first switch and the second switch to be turned on.

9. The power supply device according to claim 3, characterized in that, The grid connection port is electrically connected to the power grid, the output power of the grid connection port is greater than the power threshold, the electricity meter is electrically connected between the grid connection port and the power grid, the load port is electrically connected to the load, and the control circuit is used to control the first switch, the second switch, the third switch and the fourth switch to be turned on.

10. The power supply device according to claim 9, characterized in that, The control circuit is used to detect the current flowing into the grid through the meter when the current detection circuit stops working, and control the first power output of the first inverter circuit and / or the second power output of the second inverter circuit to decrease until the meter no longer detects the current flowing into the grid through the grid connection port.

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