Household appliance system

Abstract

The embodiment of the utility model provides a household electrical appliance system, relates to the technical field of household electrical appliances, and is used for improving the utilization rate of solar energy by household electrical appliances when a photovoltaic panel assembly supplies power to the household electrical appliances. The household appliance system comprises a photovoltaic panel assembly which is used for converting solar energy into electric energy and outputting direct current; the photovoltaic coupling box comprises a first converter, the input end of the first converter is connected with the output end of the photovoltaic panel assembly, and the output end of the first converter is connected with the direct-current power supply end of the household appliance; the first converter is used for converting the direct current output by the photovoltaic panel assembly into the direct current required by the household appliance; the input end of the second converter is connected with the output end of the photovoltaic panel assembly, the output end of the second converter is connected with the power grid power supply system, and the second converter provides the direct current output by the photovoltaic panel assembly for the power grid power supply system.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a household appliance system. Background Art

[0002] With the development needs of carbon peak and carbon neutrality, more and more home appliances use more energy-saving and environmentally friendly clean energy. Among them, solar energy is an important choice. Since solar energy is a renewable energy source with almost no emissions, using solar energy as an energy source can significantly reduce the carbon emissions of home appliances and reduce dependence on traditional energy.

[0003] At present, most of the household appliances that use solar energy as energy use photovoltaic panels, which can convert solar energy into electrical energy and power the household appliances in the form of direct current. However, when the photovoltaic panels are used to power the household appliances, they are sometimes affected by some uncontrollable factors, causing the mains (i.e., the grid power supply system) to also provide power to the household appliances. This situation may limit the household appliances from fully utilizing the electricity generated by the photovoltaic panels.

[0004] Therefore, how to improve the utilization rate of solar energy by household appliances when photovoltaic panels are used to power household appliances has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The present application provides a household appliance system for improving the utilization rate of solar energy by household appliances when photovoltaic panels are used to supply power to the household appliances.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions.

[0007] A household appliance system, comprising:

[0008] Household appliances;

[0009] Photovoltaic panel assembly, used to convert solar energy into electrical energy and output direct current;

[0010] Photovoltaic coupling box, including:

[0011] A first converter, wherein the input end of the first converter is connected to the output end of the photovoltaic panel assembly, and the output end of the first converter is connected to the DC power supply end of the household appliance; the first converter is used to convert the DC power output by the photovoltaic panel assembly into the DC power required by the household appliance;

[0012] A second converter, wherein the input end of the second converter is connected to the output end of the photovoltaic panel assembly, the output end of the second converter is connected to the grid power supply system, and the second converter provides the grid power supply system with direct current output by the photovoltaic panel assembly.

[0013] In some embodiments, the output end of the second converter is also connected to the AC power supply end of the household appliance, and the second converter is used to convert the DC power output by the photovoltaic panel assembly into the AC power required by the household appliance.

[0014] In some embodiments, the household appliance further includes an energy storage device, which is connected to the second converter and is used to store the electrical energy converted by the photovoltaic coupling box but not used for power supply.

[0015] In some embodiments, the number of the first converters is one or more.

[0016] In some embodiments, the positive electrode IN+ of the first converter input terminal is connected to the positive electrode PV+ of the photovoltaic panel assembly output terminal.

[0017] In some embodiments, the positive electrode of the output terminal of the first converter is connected to the positive electrode P+ of the DC power supply terminal of the household appliance, and the negative electrode of the output terminal of the first converter is also connected to the negative electrode P- of the DC power supply terminal of the household appliance.

[0018] In some embodiments, the positive pole IN+ of the second converter input terminal is connected to the positive pole PV+ of the photovoltaic panel assembly output terminal, and the negative pole IN- of the second converter input terminal is connected to the negative pole PV- of the photovoltaic panel assembly output terminal.

[0019] In some embodiments, when the alternating current output by the grid power supply system is three-phase alternating current, the output end of the second converter is connected to four connection terminals of the input end of the grid power supply system.

[0020] In some embodiments, the output end of the second converter is also connected to four connection terminals of the AC power supply end of the household appliance.

[0021] In some embodiments, the output end of the first converter is connected to a DC power supply end of the household appliance, and the AC power supply end of the household appliance is also connected to a grid power supply system.

[0022] It can be understood that the embodiment of the present application provides a household appliance system, and the household appliance connected to the photovoltaic coupling box can accept both AC power and DC power. In addition, the household appliance system provided by the embodiment of the present application can flexibly adjust the working state of the first converter and the second converter in the photovoltaic coupling box (the working state of the first converter supplying power to the household appliance, the working state of the second converter supplying power to the power grid power supply system, etc.) according to the relationship between the output power of the photovoltaic panel assembly and the required power of the household appliance. In this way, the second converter can supply power to the household appliance or to the power grid power supply system according to actual conditions, and the first converter can also supply power to the household appliance alone or together with the power grid power supply system according to actual conditions. In this way, energy supply can be managed more effectively, energy utilization efficiency can be improved, and contributions can be made to sustainable energy development. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0024] Figure 1 A schematic diagram of the composition of a household appliance system provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the composition of a photovoltaic coupling box provided in an embodiment of the present application;

[0026] Figure 3 A connection diagram of a first converter provided in an embodiment of the present application;

[0027] Figure 4 A connection diagram of a second converter provided in an embodiment of the present application;

[0028] Figure 5 A schematic diagram of the hardware structure of a household appliance system provided in an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the composition of an air conditioner provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of the structure of an air conditioner provided in an embodiment of the present application;

[0031] Figure 8 A hardware configuration block diagram of an air conditioner provided in an embodiment of the present application;

[0032] Fig. 9 A control method for a household appliance system provided in an embodiment of the present application;

[0033] Fig.10Another control method of a household appliance system provided in an embodiment of the present application;

[0034] Fig.11 Another control method of a household appliance system provided in an embodiment of the present application;

[0035] Fig.12 Another control method of a household appliance system provided in an embodiment of the present application;

[0036] Fig.13 Another control method of a household appliance system provided in an embodiment of the present application;

[0037] Fig.14 Another control method of a household appliance system provided in an embodiment of the present application;

[0038] Fig.15 Another control method of a household appliance system provided in an embodiment of the present application;

[0039] Fig.16 Another control method of a household appliance system provided in an embodiment of the present application;

[0040] Fig.17 Another control method of a household appliance system provided in an embodiment of the present application;

[0041] Fig.18 Another control method of a household appliance system provided in an embodiment of the present application;

[0042] Fig.19 Another control method of a household appliance system provided in an embodiment of the present application;

[0043] Fig. 20 Another control method for a home appliance system is provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In order to improve the utilization rate of solar energy by household appliances when the photovoltaic panel assembly powers the household appliances, an embodiment of the present application provides a control method for a household appliance system. When the household appliance is powered by a first converter, a voltage value greater than the output voltage of the power grid power supply system can be used as the target output voltage of the adjusted first converter, thereby ensuring that the output voltage of the first converter is always higher than the output voltage of the power grid power supply system of the power grid power supply system, thereby improving the utilization rate of solar energy by household appliances when the photovoltaic panel assembly powers the household appliances.

[0046] Figure 1 FIG. 1 is a schematic diagram of a household appliance system according to an exemplary embodiment of the present application. Figure 1 As shown, the household appliance system 100 includes a photovoltaic panel assembly 101, a photovoltaic coupling box 102, a household appliance 103 and a controller 104 ( Figure 1 not shown).

[0047] In some embodiments, the photovoltaic panel assembly 101 can be understood as a solar panel. The photovoltaic panel assembly 101 can convert solar energy into electrical energy through the photovoltaic effect, and the electrical energy output by the photovoltaic panel assembly 101 is output in the form of direct current. Optionally, the photovoltaic panel assembly 101 is generally divided into multiple types such as single crystal silicon, polycrystalline silicon, amorphous silicon, and thin film batteries.

[0048] In some embodiments, the photovoltaic coupling box 102 is connected to the photovoltaic panel assembly 101 and is used to convert the DC power generated by the photovoltaic panel assembly 101 into the DC power and / or AC power required by the household appliance 100. In addition, the AC power output by the photovoltaic coupling box 102 can also supply power to the grid power supply system.

[0049] Among them, the power grid power supply system is used to transmit electric energy from the power plant to the user side, and the electric energy output by the power grid power supply system is output in the form of alternating current.

[0050] In some embodiments, the household appliances 103 refer to various electrical appliances and electronic devices used in homes and similar places. For example, the household appliances may be smart home devices such as air conditioners, water heaters, washing machines, rice cookers, or smart curtains.

[0051] The air conditioner may be a multi-split air conditioner or a single-unit air conditioner. The multi-split air conditioner includes an outdoor unit and multiple indoor units, while the single-unit air conditioner includes an outdoor unit corresponding to an indoor unit.

[0052] In some embodiments, the controller 104 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the home appliance system 100 to execute the control instruction. Exemplarily, the controller 104 can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 104 can also be other devices with processing functions, such as circuits, devices, or software modules, and the embodiments of the present application do not impose any restrictions on this.

[0053] Optionally, the controller 104 may be a controller belonging to the household appliance system 100 , or a controller belonging to the photovoltaic coupling box 102 , and this application does not impose any special limitation on this.

[0054] Figure 2 FIG. 1 is a schematic diagram of a photovoltaic coupling box according to an exemplary embodiment of the present application. Figure 2 As shown, the photovoltaic coupling box 102 includes a first converter 201 and a second converter 202. In some embodiments, the number of the first converter 201 can be one or more.

[0055] In some embodiments, the input end of the first converter 201 is connected to the output end of the photovoltaic panel assembly 101, and the output end of the first converter 201 is connected to the DC power supply end of the household appliance 103. In addition, the first converter 201 is used to convert the DC power output by the photovoltaic panel assembly 101 into the DC power required by the household appliance 103. In some embodiments, the first converter 201 can be a first converter.

[0056] For example, Figure 3 As shown, the positive electrode IN+ of the input end of the first converter 201 is connected to the positive electrode PV+ of the output end of the photovoltaic panel assembly 101. In addition, the positive electrode of the output end of the first converter 201 is connected to the positive electrode P+ of the DC power supply end of the household appliance 103, and the negative electrode of the output end of the first converter 201 is also connected to the negative electrode P- of the DC power supply end of the household appliance 103.

[0057] In some embodiments, the input end of the second converter 202 is connected to the output end of the photovoltaic panel assembly 101, the output end of the second converter 202 is connected to the power grid power supply system, and the output end of the second converter 202 is also connected to the AC power supply end of the household appliance 103. In addition, the second converter 202 is used to convert the direct current generated by the photovoltaic panel assembly 101 into alternating current. In some embodiments, the second converter 202 can be a second converter.

[0058] For example, Figure 3 As shown, the positive pole IN+ of the input end of the second converter 202 is connected to the positive pole PV+ of the output end of the photovoltaic panel assembly 101, and the negative pole IN- of the input end of the second converter 202 is connected to the negative pole PV- of the output end of the photovoltaic panel assembly 101. In the case where the AC power output by the power grid power supply system is three-phase AC power, the output end of the second converter 202 is connected to the four wiring terminals of the input end of the power grid power supply system. In addition, the output end of the second converter 202 is also connected to the four wiring terminals (wiring terminal L1, wiring terminal L2, wiring terminal L3, wiring terminal N) of the AC power supply end of the household appliance 103.

[0059] In some embodiments, when there are multiple first converters 201, there may be multiple home appliances 103. Figure 4 As shown, the number of the first converters 201 in the photovoltaic coupling box 102 is two, and correspondingly, the number of the household electrical appliances 103 may also be two.

[0060] The output end of a first converter 201 is connected to a DC power supply end of a household appliance 103 , and the AC power supply end of each household appliance 103 can also be connected to a power grid power supply system.

[0061] In addition, both the first converter 201 and the second converter 202 are in communication connection with the controller 104 , and perform related operations according to instructions of the controller 104 .

[0062] In some embodiments, the controller 104 can obtain the output voltage of the grid power supply system when the direct current output by the photovoltaic panel assembly 101 is provided to the household appliance 103 through the first converter 201. Further, the controller 104 can adjust the output voltage of the first converter 201 according to the output voltage of the grid power supply system, so that the target output voltage of the adjusted first converter 201 is greater than the output voltage of the grid power supply system. Further, the controller 104 can control the first converter 201 to provide the household appliance 103 with the direct current output by the photovoltaic panel assembly 101 in the form of the target output voltage.

[0063] In some embodiments, before the output voltage of the grid power supply system, the controller 104 can also provide the direct current output by the photovoltaic panel assembly 101 to the household appliance 103 through the first converter 201 when the output power of the photovoltaic panel assembly 101 is greater than the required power of the household appliance 103, and provide the direct current output by the photovoltaic panel assembly 101 to the grid power supply system through the second converter 202.

[0064] Alternatively, when the output power of the photovoltaic panel assembly 101 is equal to the required power of the household appliance 103, the controller 104 can also provide the household appliance 103 with direct current output by the photovoltaic panel assembly 101 through the first converter and control the second converter 202 to be in a standby state.

[0065] Alternatively, when the output power of the photovoltaic panel assembly 101 is less than the power required by the household appliance 103, the controller 104 can also provide the household appliance 103 with direct current output by the photovoltaic panel assembly 101 through the first converter 201, so as to supply power to the household appliance 103 together with the grid power supply system.

[0066] In some embodiments, the controller 104 may also determine the sum of the output voltage of the grid power supply system and a preset threshold as the target output voltage of the first converter 201 when the output voltage of the grid power supply system is within a preset range.

[0067] Alternatively, the controller 104 may also determine a preset output voltage as the target output voltage of the first converter 201 when the output voltage of the grid power supply system is greater than an upper limit value of a preset range; wherein the preset output voltage is greater than or equal to the output voltage of the grid power supply system.

[0068] Alternatively, the controller 104 may also determine the lower limit value of the preset range as the target output voltage of the first converter 201 when the output voltage of the grid power supply system is less than the lower limit value of the preset range.

[0069] Figure 5 FIG. 1 is a schematic diagram of the hardware structure of a household appliance system provided by the present application according to an exemplary embodiment. Figure 5 As shown, the household appliance system 100 may further include an energy storage device 501 , a memory 502 and a communicator 503 .

[0070] In some embodiments, the energy storage device 501 is used to store the surplus electric energy that is not temporarily used for power supply in the electric energy converted by the photovoltaic coupling box 102. In some embodiments, the energy storage device 501 may be an energy storage battery.

[0071] In some embodiments, when the output power of the photovoltaic panel assembly 101 is greater than the required power of the household appliance 103 , the controller 104 may also provide the direct current output by the photovoltaic panel assembly 101 to the energy storage device 501 through the second converter 202 .

[0072] In some embodiments, the memory 502 can be used to store software programs and data. The controller 502 executes various functions and data processing of the household appliance system 100 by running the software programs or data stored in the memory 502. The memory 502 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. The memory 502 stores an operating system that enables the air conditioner 500 to run. In the present application, the memory 502 can store an operating system and various application programs, and can also store code for executing the control method of the household appliance system provided in the embodiment of the present application.

[0073] In some embodiments, the communicator 503 is used to establish a communication connection with other network entities, such as establishing a communication connection with a terminal device. The communicator 503 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module. Taking the RF module as an example, the RF module can be used for receiving and sending signals, in particular, sending the received information to the controller 104 for processing; in addition, sending the signal generated by the controller 104. Typically, the RF circuit may include but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0074] Take the household appliance 103 as an air conditioner as an example. Figure 6 FIG. 1 is a schematic diagram of the composition of an air conditioner provided by the present application according to an exemplary embodiment. Figure 6 As shown, the air conditioner 600 includes an indoor unit 601, an outdoor unit 602 and a controller 603 ( Figure 6 not shown).

[0075] In some embodiments, the number of indoor units 601 may be one or more, and the number of outdoor units 602 may be one or more, which is not limited in any way in the embodiments of the present application.

[0076] Indoor unit 601, taking indoor unit 601 as an indoor hanging unit as an example, the indoor hanging unit is usually installed on an indoor wall, etc. For another example, an indoor cabinet unit is also a form of indoor unit of the indoor unit.

[0077] The outdoor unit 602 is usually arranged outdoors and can be connected to the indoor unit 601 for heat exchange in the indoor environment. In addition, the outdoor unit 602 is usually located outdoors on the opposite side of the indoor unit 601 across a wall.

[0078] In some embodiments, the controller 603 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner 600 to execute the control instruction. Exemplarily, the controller can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD) or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices or software modules, and the embodiments of the present application do not impose any restrictions on this.

[0079] In addition, both the outdoor unit 602 and the indoor unit 601 are connected to the controller 603 ( Figure 1 There is a communication connection (not shown) and related operations are performed according to the instructions of the controller 603.

[0080] For example, the number of indoor units 601 is three and the number of outdoor units 602 is one. Figure 7 Schematic diagram of the structure of an air conditioner provided by the present application according to an exemplary embodiment. Figure 7 As shown, the air conditioner 600 includes an indoor heat exchanger 701, an indoor throttling device 702, a compressor 703, a four-way valve 704, an outdoor heat exchanger 705, an outdoor throttling device 706 and a gas-liquid separator 707.

[0081] Among them, the indoor heat exchanger 701 and the indoor throttling device 702 are part of the indoor unit 501, and the compressor 703, the four-way valve 704, the outdoor heat exchanger 705, the outdoor throttling device 706 and the gas-liquid separator 707 are part of the outdoor unit 502.

[0082] In some embodiments, the indoor heat exchanger 701 has a first inlet and outlet for liquid refrigerant to flow between the indoor throttling device 702, and a second inlet and outlet for gas refrigerant to flow between the indoor throttling device 702 and the suction port of the compressor 703. The indoor heat exchanger 701 allows the refrigerant flowing in the heat transfer pipe connected between the first inlet and the second inlet to exchange heat with the indoor air.

[0083] In some embodiments, the indoor throttling device 702 is used to adjust the refrigerant flow rate in the air conditioner pipeline. For example, the indoor throttling device 702 is an electronic expansion valve, which has the function of expanding and reducing the pressure of the refrigerant flowing through the electronic expansion valve, and can be used to adjust the supply of refrigerant in the pipeline. If the electronic expansion valve reduces the opening, the flow resistance of the refrigerant passing through the electronic expansion valve increases. If the electronic expansion valve increases the opening, the flow resistance of the refrigerant passing through the electronic expansion valve decreases. In this way, when the opening of the electronic expansion valve changes, the refrigerant flow rate flowing to the indoor heat exchanger 701 will change.

[0084] In some embodiments, the compressor 703 is arranged between the outdoor throttling device 706 and the gas-liquid separator 707, and is used to compress the refrigerant delivered by the gas-liquid separator 707, and deliver the compressed refrigerant to the outdoor throttling device 706 via the four-way valve 704.

[0085] In some embodiments, the four ports of the four-way valve 704 are respectively connected to the compressor 703, the outdoor heat exchanger 705, the gas-liquid separator 707 and the indoor heat exchanger 701. The four-way valve 704 is used to achieve mutual conversion between cooling and heating by changing the flow direction of the refrigerant in the system pipeline.

[0086] In some embodiments, the outdoor heat exchanger 705 has a third inlet and outlet for allowing the refrigerant to flow between the four-way valve 704 and the discharge port of the compressor 703, and has a fourth inlet and outlet for allowing the refrigerant to flow between the outdoor heat exchanger 705 and the outdoor throttling device 706. The outdoor heat exchanger 705 allows heat exchange between the heat exchanger flowing in the heat transfer pipe connected between the third inlet and outlet and the fourth inlet and outlet and the outdoor air.

[0087] In some embodiments, the outdoor throttling device 706 is used to adjust the refrigerant flow in the air conditioner pipeline. For example, the outdoor throttling device 702 is an electronic expansion valve, which has the function of expanding and reducing the pressure of the refrigerant flowing through the electronic expansion valve, and can be used to adjust the supply of refrigerant in the pipeline.

[0088] In some embodiments, the outlet of the gas-liquid separator 707 is connected to the inlet of the compressor 703, and the inlet of the gas-liquid separator 707 is connected to the S port of the four-way valve 704. In the gas-liquid separator 707, taking the refrigeration cycle as an example, the refrigerant flowing from the indoor heat exchanger 701 to the compressor 703 via the four-way valve 704 is separated into gas refrigerant and liquid refrigerant. In addition, the gas refrigerant is mainly supplied from the gas-liquid separator 707 to the discharge port of the compressor 703.

[0089] In addition, the controller 603 can be used to control the operation of various components inside the air conditioner 600, so that the various components of the air conditioner 600 can operate to achieve various predetermined functions of the air conditioner.

[0090] In some embodiments, the controller 603 may be integrated into the outdoor unit 602 , that is, the outdoor unit 602 may control the operation of various components in the air conditioner 600 .

[0091] In some embodiments, the air conditioner 600 is also provided with a remote controller, which has the function of communicating with the controller 603 using infrared or other communication methods. The remote controller is used for the user to control the air conditioner in various ways and realize the interaction between the user and the air conditioner 600.

[0092] Figure 8 This is a hardware configuration block diagram of an air conditioner provided by the present application according to an exemplary embodiment. Figure 8 As shown, the air conditioner 600 may further include one or more of the following: a communicator 801 and a memory 802 .

[0093] In some embodiments, the communicator 801 is used to establish a communication connection with other network entities, such as establishing a communication connection with a terminal device. The communicator 801 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module. Taking the RF module as an example, the RF module can be used for receiving and sending signals, in particular, sending the received information to the controller 603 for processing; in addition, sending the signal generated by the controller 603. Typically, the RF circuit may include but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0094] In some embodiments, the memory 802 can be used to store software programs and data. The controller 603 executes various functions and data processing of the air conditioner 600 by running the software programs or data stored in the memory 802. The memory 802 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. The memory 802 stores an operating system that enables the air conditioner 600 to run. In the present application, the memory 802 can store an operating system and various application programs.

[0095] Those skilled in the art will understand that Figure 8 The hardware structure shown in the figure does not constitute a limitation on the air conditioner. The air conditioner may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0096] The embodiments provided in this application are described in detail below in conjunction with the accompanying drawings.

[0097] like Fig. 9 As shown, an embodiment of the present application provides a control method for a home appliance system, the method comprising the following steps:

[0098] S101. When providing direct current outputted by a photovoltaic panel assembly to a household appliance through a first converter, a controller obtains an output voltage of a power supply system of a power grid.

[0099] The output voltage of the power grid power supply system is a DC voltage output after rectification by the power grid power supply system.

[0100] In some embodiments, before obtaining the output voltage of the grid power supply system, the controller determines the power supply mode of the household appliance based on the output power of the photovoltaic panel assembly and the power demand of the household appliance, that is, determines whether the grid power supply system provides AC power to the household appliance, or whether the first converter in the photovoltaic coupling box provides the household appliance with DC power output by the photovoltaic panel assembly.

[0101] In addition, regarding the determination of the power supply method, please refer to the following Fig.11 The specific description of determining the power supply method in the illustrated embodiment is not repeated in this application.

[0102] In some embodiments, regardless of whether the grid power supply system provides three-phase AC power or single-phase AC power, the controller obtains the output voltage of the grid power supply system while providing the DC power output by the photovoltaic panel assembly to the household appliance through the first converter.

[0103] For example, Fig.10 As shown, when the power grid power supply system provides three-phase alternating current, the controller can obtain the output voltage of the power grid power supply system through the following steps.

[0104] Step a1: The controller obtains the phase voltage or line voltage of the power supply system of the power grid, and the type of the rectifier circuit.

[0105] The rectifier circuit is used to rectify the AC power output by the power grid into the DC power required by the household appliances. The types of rectifier circuits may include three-phase half-wave rectification, three-phase full-wave rectification or three-phase bridge rectification.

[0106] Each phase of the three-phase AC has a voltage value, which is called the phase voltage. The line voltage refers to the voltage difference between any two phases of the three-phase AC. The units of the phase voltage and line voltage are both volts (V).

[0107] Step a2: The controller calculates the output voltage of the grid power supply system according to the phase voltage or the line voltage and the type of the rectifier circuit.

[0108] In one example, when the type of the rectifier circuit is a three-phase bridge rectifier, the output voltage of the grid power supply system can be obtained by the following formula (1).

[0109] V=2.34×v Formula (1)

[0110] Among them, V is the output voltage of the power supply system of the power grid (that is, the DC voltage output by the power supply system after rectification); v is the phase voltage of the three-phase electricity.

[0111] S102 : The controller adjusts the output voltage of the first converter according to the output voltage of the power grid system, so that the adjusted target output voltage of the first converter is greater than the output voltage of the power grid system.

[0112] In some embodiments, the controller may determine the target output voltage of the first converter according to the output voltage of the grid power supply system, and then the controller may adjust the output voltage of the first converter based on the target output voltage of the first converter.

[0113] In addition, regarding the target output voltage of the first converter, the following can be referred to. Fig.16 The specific description of the target output voltage in the illustrated embodiment is not repeated in this application.

[0114] In some embodiments, when adjusting the output voltage of the first converter, the controller may adjust the output voltage of the first converter by changing the duty cycle of a pulse width modulation (PWM) signal. Typically, increasing the duty cycle of the PWM signal will increase the output voltage of the first converter, and decreasing the duty cycle of the PWM signal will decrease the output voltage of the first converter.

[0115] Exemplarily, the controller may adjust the duty cycle of the PWM signal according to a difference between a target output voltage of the first converter and an output voltage of the grid power supply system.

[0116] If the difference between the target output voltage of the first converter and the output voltage of the grid power supply system is small, the controller can fine-tune the duty cycle of the PWM signal to gradually increase the output voltage of the first converter and reach the target output voltage. If the difference between the target output voltage of the first converter and the output voltage of the grid power supply system is large, the controller needs to adjust the duty cycle of the PWM signal more significantly to quickly increase the output voltage of the first converter.

[0117] After adjusting the duty cycle of the PWM signal, the controller can obtain the output voltage of the first converter and the output voltage of the grid power supply system again, and compare the output voltage of the first converter with the target output voltage. If the output voltage of the first converter has reached the target output voltage, the adjustment process ends; otherwise, the controller will continue to adjust the duty cycle of the PWM signal until the output voltage of the first converter reaches the target output voltage.

[0118] S103: The controller controls the first converter to provide the home appliance with direct current output by the photovoltaic panel assembly in the form of a target output voltage.

[0119] It can be understood that the controller controls the operation of the first converter so that the target output voltage outputted by the first converter matches the voltage required by the home appliance. In this way, the home appliance can use the direct current outputted by the photovoltaic panel assembly as its power source to meet the requirements of its normal operation. The controller adjusts the first converter to ensure that the voltage of the direct current supplied to the home appliance meets the requirements of the home appliance.

[0120] In some embodiments, the controller continuously obtains the output voltage of the first converter and the output voltage of the grid power supply system in real time, and compares the output voltage of the first converter with the target output voltage. If the output voltage of the first converter is inconsistent with the target output voltage, the controller continues to adjust the duty cycle of the PWM signal until the output voltage of the first converter reaches the target output voltage.

[0121] based on Fig. 9 In the embodiment shown, the embodiment of the present application provides a control method for a household appliance system. When the household appliance is powered by a first converter, a voltage value greater than the output voltage of the power grid power supply system can be used as the target output voltage of the adjusted first converter, thereby ensuring that the output voltage of the first converter is always higher than the output voltage of the power grid power supply system. According to the circuit principle, the current flows from a high voltage to a low voltage, so this method can ensure that the direct current output by the first converter is used to power the household appliance first, thereby improving the utilization rate of solar energy by the household appliance when the photovoltaic panel assembly is used to power the household appliance.

[0122] In some embodiments, Fig.11 As shown, in order to determine the power supply mode of the home appliance, the control method of the home appliance system provided by the present application also includes the following steps.

[0123] S201. The controller obtains the output power of the photovoltaic panel assembly and the required power of the household electrical appliance.

[0124] In some embodiments, the controller may obtain the output power of the photovoltaic panel assembly and the required power of the household appliance through sensors, measuring instruments and other devices.

[0125] In one example, the controller can monitor and record the output current, voltage, power and other parameters of the photovoltaic panel assembly in real time through a photovoltaic cell monitoring system installed on the photovoltaic panel assembly. These data can be transmitted to the controller through a communicator, and then the controller can obtain the output power of the photovoltaic panel assembly based on these data.

[0126] In another example, the controller can monitor the current, voltage, power and other parameters of the home appliance in real time through sensors or power detection instruments installed on the home appliance. These data can also be transmitted to the controller through the communicator. Then, the controller can calculate the required power of the home appliance based on these data.

[0127] S202. When the output power of the photovoltaic panel assembly is greater than the power demand of the household appliance, the controller provides the DC power output by the photovoltaic panel assembly to the household appliance through a first converter, and provides the DC power output by the photovoltaic panel assembly to the grid power supply system through a second converter.

[0128] It is understandable that if the output power of the photovoltaic panel assembly is greater than the power required by the household appliance, it means that the photovoltaic panel is generating more electricity than the household appliance requires. In this case, the excess electricity can be transmitted to the grid power supply system for use by other users, thereby making full use of and managing the extra electricity.

[0129] In some embodiments, Fig.12 As shown, the step of the controller controlling the first converter to supply power to the household appliance can be implemented as the following steps.

[0130] Step b1, the controller obtains the output voltage and output current of the photovoltaic panel assembly in real time.

[0131] In some embodiments, the controller monitors the output voltage and output current of the photovoltaic panel assembly in real time through a sensor connected to the first converter. Optionally, the output power of the photovoltaic panel assembly can be obtained according to the output voltage and output current of the photovoltaic panel assembly.

[0132] Step b2: The controller adjusts the output voltage and output current of the first converter in real time according to the required power of the household appliance, the output voltage and output current of the photovoltaic panel assembly.

[0133] It can be understood that the controller can match the first converter with the home appliance by adjusting the output voltage and output current of the first converter. In this way, the home appliance can obtain the required DC power from the first converter. In addition, the controller can adjust the output voltage and output current of the first converter in real time as needed to ensure the stability of the output voltage and output current. This helps to protect the home appliance from voltage fluctuations and improve the reliability of power supply.

[0134] For example, the output power of the photovoltaic panel assembly is 60W, the power demand of the household appliance is 50W, and the output voltage of the photovoltaic panel assembly obtained by the controller in real time is 20V and the output current is 3A. Since the output power of the photovoltaic panel exceeds the power demand of the household appliance, the controller needs to adjust the output voltage and output current of the first converter.

[0135] The controller can reduce the output voltage, for example, adjust the output voltage of the photovoltaic panel assembly from 20V to 18V. The controller can also adjust the output current accordingly to keep the output power unchanged. For example, the controller can calculate the adjusted output current as 50W / 18V=2.78A based on the power calculation formula P=V×I. Among them, P is power, V is voltage, and I is current.

[0136] After adjustment, the voltage output by the first converter is 18 V and the current is 2.78 A. The home appliance can obtain the required direct current from the first converter to meet the required power of 50 W of the home appliance.

[0137] In some embodiments, Fig.13 As shown, the controller controls the second converter to provide the direct current output by the photovoltaic panel assembly to the grid power supply system, which can be implemented as follows.

[0138] Step c1, the controller obtains the output voltage and output current of the photovoltaic panel assembly in real time.

[0139] In some embodiments, the controller monitors the output voltage and output current of the photovoltaic panel assembly in real time through a sensor connected to the second converter. Optionally, the output power of the photovoltaic panel assembly can be obtained according to the output voltage and output current of the photovoltaic panel assembly.

[0140] Step c2: The controller controls the second converter to convert the direct current output by the photovoltaic panel assembly into alternating current, and sends the alternating current to the grid power supply system.

[0141] In some embodiments, the electronic components inside the second converter can realize the conversion process of converting the direct current output by the photovoltaic panel assembly into alternating current, and ensure that the output alternating current meets the requirements of the power supply system of the power grid.

[0142] In some embodiments, the grid power supply system is connected to the home appliance system through the second converter, and then the controller can transmit the DC power output by the photovoltaic panel assembly to the grid power supply system through the second converter. In this way, the excess power can be transmitted to the grid power supply system for use by other users. This helps to improve the utilization rate of photovoltaic power generation in the home appliance system and reduce the demand for traditional electricity.

[0143] In some embodiments, the controller may further control the second converter to output direct current to the photovoltaic panel assembly of the energy storage device, so that the energy storage device stores the electrical energy generated by the photovoltaic panel assembly.

[0144] In a possible implementation, the controller may also control the proportion of power supplied to household appliances, power grid control systems, energy storage devices, and the like.

[0145] S203: When the output power of the photovoltaic panel assembly is equal to the required power of the household appliance, the controller provides the household appliance with direct current output by the photovoltaic panel assembly through the first converter, and controls the second converter to be in a standby state.

[0146] It is understandable that if the output power of the photovoltaic panel assembly is equal to the power demand of the household appliance, it means that the power generated by the photovoltaic panel assembly is just enough for the household appliance. In this case, it is sufficient to control the first converter to provide the household appliance with the DC power output by the photovoltaic panel assembly.

[0147] In addition, regarding controlling the first converter to provide the home appliance with direct current output by the photovoltaic panel assembly, reference may be made to the specific description of controlling the first converter to provide power to the home appliance in step S202, which will not be elaborated in this application.

[0148] In some embodiments, Fig.14 As shown, the step of the controller controlling the second converter to be in the standby state can be implemented as the following steps.

[0149] Step d1: The controller sends a standby instruction to the second converter.

[0150] In some embodiments, when the output power of the photovoltaic panel assembly is equal to the required power of the household appliance, the controller can send a standby instruction to the second converter through a communication protocol (such as Modbus, CAN, etc.) or a signal line.

[0151] Step d2: The second converter is in a standby state in response to the standby instruction.

[0152] In some embodiments, when the second converter receives the standby instruction sent by the controller, the second converter will perform corresponding operations and put itself into a standby state. In the standby state, the second converter stops converting direct current into alternating current and does not provide the direct current output by the photovoltaic panel assembly to the grid power supply system.

[0153] S204: When the output power of the photovoltaic panel assembly is less than the required power of the household appliance, the controller provides the household appliance with direct current output by the photovoltaic panel assembly through a first converter, so as to supply power to the household appliance together with the power grid power supply system.

[0154] It is understandable that if the output power of the photovoltaic panel assembly is less than the power required by the household appliance, it means that the photovoltaic panel assembly cannot currently provide enough power to meet the needs of the household appliance. This may be caused by a variety of reasons, such as poor weather conditions leading to insufficient light, partial obstruction or pollution of the photovoltaic panel assembly, or insufficient system design capacity. In this case, in order to ensure that the household appliance obtains the required power supply, it can be considered to control the first converter and the grid power supply system to jointly supply power to the household appliance.

[0155] In addition, regarding how the first converter provides the DC power output by the photovoltaic panel assembly to the home appliance, you can refer to the specific description of providing the DC power output by the photovoltaic panel assembly to the home appliance through the first converter in the above step S202, and this application will not elaborate on it here.

[0156] In some embodiments, when the controller provides the direct current output by the photovoltaic panel assembly to the home appliance through the first converter, the controller can determine whether the direct current output by the photovoltaic panel assembly meets the power demand of the home appliance.

[0157] If the DC power output by the photovoltaic panel assembly cannot meet the power requirements of the household appliances, the controller will obtain additional power from the grid power supply system to supplement the remaining power. This can be achieved by connecting to the grid power supply system and adjusting the connection device (such as a circuit breaker or contactor).

[0158] The following is combined with Fig.15 The illustrated embodiment exemplarily introduces the complete process of determining the power supply mode of the household appliance.

[0159] like Fig.15 As shown, the process starts.

[0160] Step A1: The controller obtains the output power of the photovoltaic panel assembly and the required power of the household appliance.

[0161] Determine whether the output power of the photovoltaic panel assembly is greater than the required power of the household appliance.

[0162] If yes, execute the following step A3.

[0163] If not, execute the following step A2.

[0164] Step A2: determine whether the output power of the photovoltaic panel assembly is less than the required power of the household appliance.

[0165] If yes, execute the following step A5.

[0166] If not, execute the following step A4.

[0167] Step A3: The controller provides the direct current output by the photovoltaic panel assembly to the household appliance through the first converter, and provides the direct current output by the photovoltaic panel assembly to the grid power supply system through the second converter.

[0168] Step A4: The controller provides the direct current output by the photovoltaic panel assembly to the household appliance through the first converter, and controls the second converter to be in a standby state.

[0169] Step A5: The controller provides the direct current output by the photovoltaic panel assembly to the household appliance through the first converter, so as to supply power to the household appliance together with the power grid power supply system.

[0170] based on Fig.11 In the embodiment shown, the embodiment of the present application provides a control method for household appliances, which can flexibly adjust the working state of the first converter and the second converter in the photovoltaic coupling box (the working state of the first converter supplying power to the household appliance, the working state of the second converter supplying power to the power grid power supply system, etc.) according to the size relationship between the output power of the photovoltaic panel assembly and the required power of the household appliance. In this way, the second converter can supply power to the household appliance or to the power grid power supply system according to actual conditions, and the first converter can also supply power to the household appliance alone or together with the power grid power supply system according to actual conditions. In this way, energy supply can be managed more effectively, energy utilization efficiency can be improved, and contributions can be made to sustainable energy development.

[0171] In some embodiments, to adjust the output voltage of the first converter, as Fig.16 As shown, the control method of the home appliance system provided in the present application also includes the following steps, that is, step S102 can be implemented as the following steps.

[0172] S301 : When an output voltage of a power grid power supply system is within a preset range, a controller determines a sum of an output voltage of the power grid power supply system and a preset threshold as a target output voltage of a first converter.

[0173] The first preset output voltage is greater than the output voltage of the grid power supply system.

[0174] Optionally, when the power grid power supply system provides three-phase AC power, the preset range may be [540, +∞], or [540, 810]. When the power grid power supply system provides single-phase AC power, the preset range may be [320, 510], or [320, +∞]. The preset threshold may be 10V, 20V, etc., and this application does not impose any special restrictions on the setting of the preset threshold.

[0175] It can be understood that if the output voltage of the grid power supply system is within the preset range, it means that the output voltage of the grid power supply system is within a safer range. At this time, the sum of the output voltage of the grid power supply system and the preset threshold is directly determined as the target output voltage of the first converter, and the target output voltage will also be within a safer range.

[0176] In some embodiments, when the output voltage of the grid power supply system is within a preset range, the target output voltage of the first converter is obtained by the following formula (2).

[0177] Vo=V+a Formula (2)

[0178] Wherein, Vo is the target output voltage of the first converter; V is the output voltage of the grid power supply system; and a is the preset threshold.

[0179] S302: When the output voltage of the power grid power supply system is greater than an upper limit value of a preset range, the controller determines a preset output voltage as a target output voltage of the first converter.

[0180] The preset output voltage is greater than or equal to the output voltage of the power supply system of the power grid.

[0181] It can be understood that if the output voltage of the grid power supply system is greater than the upper limit of the preset range, it means that the output voltage of the grid power supply system is too high. If the sum of the output voltage of the grid power supply system and the preset threshold is directly determined as the target output voltage of the first converter in the above step S301, the target output voltage is higher, which will damage the photovoltaic coupling box and the household appliance. At this time, it is necessary to forcibly limit the target output voltage of the first converter to the preset output voltage so that the target output voltage of the first converter is limited to a safe range.

[0182] Exemplarily, the upper limit of the preset range is 800V. When the output voltage of the grid power supply system is greater than 800V, the target output voltage of the first converter is forcibly limited to 810V to ensure that the photovoltaic coupling box and household appliances are not damaged.

[0183] S303: When the output voltage of the power grid power supply system is less than a lower limit value of a preset range, the controller determines the lower limit value of the preset range as the target output voltage of the first converter.

[0184] Exemplarily, taking the output voltage of the grid power supply system as 320V and the preset range as [540, 800], the target output voltage of the first converter is 540V.

[0185] It should be noted that, when the upper limit value of the preset range is +∞, the output voltage of the power supply system of the power grid will not be greater than the upper limit value of the preset range. Therefore, in this case, step S302 may not be set.

[0186] Combine the following Fig.17 The illustrated embodiment exemplarily introduces a complete process of determining the target output voltage of the first converter when the power grid power supply system provides three-phase AC power, the preset range is [540, +∞], and the preset threshold is 10V.

[0187] like Fig.17 As shown, the process starts.

[0188] Step B1: The controller obtains the output voltage V1 of the power supply system of the power grid.

[0189] Determine whether V1 is within [540, +∞].

[0190] If yes, execute the following step B3.

[0191] If not, execute the following step B2.

[0192] Step B2: The controller determines 540V as the target output voltage of the first converter.

[0193] Step B3: The controller determines the sum of V1 and 10V as the target output voltage of the first converter.

[0194] Combine the following Fig.18 The illustrated embodiment exemplarily introduces a complete process of determining the target output voltage of the first converter when the power grid power supply system provides three-phase AC power, the preset range is [540, 800], and the preset threshold is 10V.

[0195] Step C1: The controller obtains the output voltage V1 of the power supply system of the power grid.

[0196] Determine whether V1 is within [540, 810].

[0197] If yes, execute the following step C3.

[0198] If not, execute the following step C2.

[0199] Step C2: determine whether V1 is less than 540.

[0200] If yes, execute the following step C4.

[0201] If not, execute the following step C5.

[0202] Step C3: The controller determines the sum of V1 and 10V as the target output voltage of the first converter.

[0203] Step C4: The controller determines 540V as the target output voltage of the first converter.

[0204] Step C5: The controller determines 810V as the target output voltage of the first converter.

[0205] Combine the following Fig.19 The illustrated embodiment exemplarily introduces a complete process of determining the target output voltage of the first converter when the grid power supply system provides single-phase AC power, the preset range is [320, +∞], and the preset threshold is 10V.

[0206] Step D1, the controller obtains the output voltage V1 of the power supply system of the power grid.

[0207] Determine whether V1 is within [320, +∞].

[0208] If yes, execute the following step D3.

[0209] If not, execute the following step D2.

[0210] Step D2: The controller determines 320V as the target output voltage of the first converter.

[0211] Step D3: The controller determines the sum of V1 and 10V as the target output voltage of the first converter.

[0212] Combine the following Fig. 20 The illustrated embodiment exemplarily introduces a complete process of determining the target output voltage of the first converter when the grid power supply system provides single-phase AC power, the preset range is [320, 500], and the preset threshold is 10V.

[0213] Step E1: The controller obtains the output voltage V1 of the power supply system of the power grid.

[0214] Determine whether V1 is within [320, 5000].

[0215] If yes, execute the following step E3.

[0216] If not, execute the following step E2.

[0217] Step E2: determine whether V1 is less than 320.

[0218] If yes, execute the following step E4.

[0219] If not, execute the following step E5.

[0220] Step E3: The controller determines the sum of V1 and 10V as the target output voltage of the first converter.

[0221] Step E4: The controller determines 320V as the target output voltage of the first converter.

[0222] Step E5: The controller determines 510V as the target output voltage of the first converter.

[0223] An embodiment of the present invention further provides a computer-readable storage medium, which includes computer-executable instructions. When the computer-executable instructions are executed on a computer, the computer executes a method for controlling a home appliance system as provided in the above embodiment.

[0224] An embodiment of the present invention further provides a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement a control method for a home appliance system provided in the above embodiment.

[0225] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A household appliance system, characterized in that: include: Household appliances; Photovoltaic panel assembly, used to convert solar energy into electrical energy and output direct current; Photovoltaic coupling box, including: A first converter, wherein the input end of the first converter is connected to the output end of the photovoltaic panel assembly, and the output end of the first converter is connected to the DC power supply end of the household appliance; the first converter is used to convert the DC power output by the photovoltaic panel assembly into the DC power required by the household appliance; The second converter has an input end connected to the output end of the photovoltaic panel assembly, an output end of the second converter connected to the grid power supply system, and the second converter provides the grid power supply system with direct current output by the photovoltaic panel assembly.

2. The household appliance system according to claim 1, characterized in that: The output end of the second converter is also connected to the AC power supply end of the household appliance, and the second converter is used to convert the DC power output by the photovoltaic panel assembly into the AC power required by the household appliance.

3. The household appliance system according to claim 1, characterized in that: The household appliance further includes an energy storage device, which is connected to the second converter and is used to store the electric energy converted by the photovoltaic coupling box but not used for power supply.

4. The household appliance system according to claim 1, characterized in that: The number of the first converters is one or more.

5. The household appliance system according to claim 1, characterized in that: The positive electrode IN+ of the input end of the first converter is connected to the positive electrode PV+ of the output end of the photovoltaic panel assembly.

6. The household appliance system according to claim 1, characterized in that: The positive electrode of the output end of the first converter is connected to the positive electrode P+ of the DC power supply end of the household appliance, and the negative electrode of the output end of the first converter is also connected to the negative electrode P- of the DC power supply end of the household appliance.

7. The household appliance system according to claim 1, characterized in that: The positive pole IN+ of the second converter input terminal is connected to the positive pole PV+ of the photovoltaic panel assembly output terminal, and the negative pole IN- of the second converter input terminal is connected to the negative pole PV- of the photovoltaic panel assembly output terminal.

8. The household appliance system according to claim 7, characterized in that: In the case where the alternating current output by the power supply system of the power grid is three-phase alternating current, the output end of the second converter is connected to four connection terminals of the input end of the power supply system of the power grid.

9. The household appliance system according to claim 8, characterized in that: The output end of the second converter is also connected to four connection terminals of the AC power supply end of the household appliance.

10. The household appliance system according to claim 1, characterized in that: The output end of the first converter is connected to the DC power supply end of the household appliance, and the AC power supply end of the household appliance is also connected to the power grid power supply system.

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