Hybrid power supply circuit and hybrid power supply control method

Abstract

The application provides a hybrid power supply circuit and a hybrid power supply control method. The method comprises the following steps: in the starting process of a target device, the Boost circuit 1 and the Boost circuit 2 are used for common power supply by the output voltage of a solar photovoltaic assembly and the closing of a control switch, wherein the Boost circuit 1 is used for lifting the output voltage of the solar photovoltaic assembly to a DC bus voltage, and the Boost circuit 2 is used for lifting the output voltage of AC mains to the DC bus voltage; in the running process of the target device, the Boost circuit 1 and the Boost circuit 2 are used for common power supply by the maximum output power of the solar photovoltaic assembly and the closing of the control switch. The application improves the reliability of the circuit.

Description

Technical Field

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

[0002] With the increasing prominence of the contradiction between energy shortages and the demand for energy in production and daily life, the development and application of new energy sources have gradually gained attention from countries around the world. Clean and environmentally friendly photovoltaic power generation and its applications have become one of the more popular research areas in my country, and the market prospects for photovoltaic-related fields are quite broad.

[0003] To protect the environment and save energy, clean and renewable solar energy can now be applied to home appliances. Currently, there are many technical solutions for hybrid power supply combining grid power and solar power. These solutions directly integrate the photovoltaic power generation system into the DC side of a mature air conditioning power supply system, forming a hybrid power supply system with the grid power.

[0004] Since both mains power and solar photovoltaic power have their own boost circuits, in scenarios where solar power is unavailable (such as cloudy days, rainy days, or nighttime), the boost circuit of the solar power supply remains idle and does not operate. Alternatively, in scenarios where solar power is sufficient and the air conditioner only requires solar power and does not need AC mains power, the boost circuit of the AC mains power supply remains idle and does not operate.

[0005] Therefore, in the existing technology, when the mains power and photovoltaic power are mixed, the current only passes through a single boost circuit. The current flow in the boost circuit is large, which can easily damage components and result in low circuit reliability. Summary of the Invention

[0006] The purpose of this application is to provide a hybrid power supply circuit and a hybrid power supply control method to solve the problem of low circuit reliability. The specific technical solution is as follows:

[0007] In a first aspect, a hybrid power supply circuit is provided, the circuit comprising:

[0008] Switch 1 is connected to the output terminal of the solar photovoltaic module on one side and to the input terminal of Boost circuit 1 and one side of switch 3 on the other side, respectively, for controlling the power supply of the solar photovoltaic module. The power supply of the solar photovoltaic module is provided by Boost circuit 1 and Boost circuit 2 when switch 1 and switch 3 are closed and switch 2 is open.

[0009] Switch 2 has one side connected to the output terminal of the mains power and the other side connected to the input terminal of the rectifier bridge. It is used to control the power supply of AC mains power. The AC mains power supply is used to supply power through Boost circuit 1 and Boost circuit 2 when switch 2 and switch 3 are closed and switch 1 is open.

[0010] Switch 3, on the other side of which is connected to the output terminal of the rectifier bridge and the input terminal of the Boost circuit 2, is used to enable the solar photovoltaic module and AC mains power to be supplied together when it is open, and to enable the solar photovoltaic module or AC mains power to be supplied separately when it is closed. The solar photovoltaic module and AC mains power supply is used to supply power through the Boost circuit 1 and Boost circuit 2 when switches 1 and 2 are closed and switch 3 is open.

[0011] Secondly, a hybrid power supply control method is provided, the method comprising:

[0012] During the startup process of the target device, the output voltage of the solar photovoltaic module and the closing of the control switch enable the Boost boost circuit 1 and Boost boost circuit 2 to work together to provide power. The Boost boost circuit 1 is used to boost the output voltage of the solar photovoltaic module to the DC bus voltage, and the Boost boost circuit 2 is used to boost the output voltage of the AC mains to the DC bus voltage.

[0013] During the operation of the target device, the maximum output power of the solar photovoltaic module and the closing of the control switch enable the Boost boost circuit 1 and Boost boost circuit 2 to work together to provide power.

[0014] Optionally, the step of using the output voltage of the solar photovoltaic module and the closing of the control switch to achieve power supply by employing both Boost converter 1 and Boost converter 2 during the power-on process of the target device includes:

[0015] When the target device is turned on, switch 2 is closed, and the output voltage of the solar photovoltaic module is detected by the voltage detection circuit. The switch 2 is used to control the power supply of AC mains.

[0016] When the output voltage is less than the voltage threshold, AC mains power is supplied by disconnecting switch 1 and closing switch 3. The disconnection of switch 1 and the closing of switches 2 and 3 are used to allow the AC mains current to pass through the Boost boost circuit 1 and Boost boost circuit 2 to supply power.

[0017] When the output voltage is greater than or equal to the voltage threshold, the solar photovoltaic module and the AC mains power are jointly supplied by closing switch 1 and opening switch 3. Specifically, closing switch 1 and switch 2 and opening switch 3 are used to allow the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the AC mains power to pass through the Boost circuit 2 to supply power.

[0018] Optionally, when the output voltage is less than the voltage threshold, supplying AC mains power by disconnecting switch 1 and closing switch 3 includes:

[0019] When the output voltage is less than the voltage threshold, power is supplied through the Boost circuit 2 by disconnecting switch 1 and switch 3 and closing switch 2.

[0020] If the current of the DC bus exceeds the set current or the power of the DC bus exceeds the set power, close switch 3;

[0021] The AC mains power is controlled by switches 2 and 3, and is jointly powered by Boost circuit 1 and Boost circuit 2.

[0022] Optionally, during the operation of the target device, the combined power supply of Boost converter 1 and Boost converter 2 is achieved by using the maximum output power of the solar photovoltaic modules and the closing of the control switch, including:

[0023] The maximum power point tracking algorithm is used to determine the maximum output power of a solar photovoltaic module;

[0024] When the maximum output power is less than the power threshold, AC mains power is supplied by disconnecting switch 1 and closing switches 2 and 3. Disconnecting switch 1 and closing switches 2 and 3 allows the AC mains current to pass through the Boost circuit 1 and Boost circuit 2 to supply power.

[0025] When the maximum output power is greater than or equal to the power threshold, it is determined whether the maximum output power is greater than or equal to the required total power of the target device;

[0026] When the maximum output power is greater than or equal to the required total power, the solar photovoltaic module is powered by closing switch 1 and switch 3 and opening switch 2. The closing of switch 1 and switch 3 and opening of switch 2 is used to allow the current of the solar photovoltaic module to be supplied through the Boost circuit 1 and Boost circuit 2.

[0027] When the maximum output power is less than the required total power, the solar photovoltaic module and AC mains power are supplied together by closing switch 1 and switch 2 and opening switch 3. The closing of switch 1 and switch 2 and opening of switch 3 is used to allow the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the AC mains power to pass through the Boost circuit 2 to supply power.

[0028] Optionally, when the maximum output power is less than the required total power, the combined power supply of the solar photovoltaic modules and AC mains power is achieved by closing switches 1 and 2 and opening switch 3, including:

[0029] When the maximum output power is less than the required total power, the required output power of the AC mains is determined by controlling the switching frequency and duty cycle of the switching transistor 2 in the Boost circuit 2, wherein the required output power is greater than the preset power.

[0030] Optionally, after the target device is running, the method further includes:

[0031] By controlling the closing of the switch, the state switching between different power supply states is realized. Each power supply state is powered by both the Boost boost circuit 1 and the Boost boost circuit 2.

[0032] Optionally, the state switching between different power supply states by controlling the closing of the switch includes:

[0033] When the target device is powered by both solar photovoltaic modules and AC mains power, the power supply status is switched to solar photovoltaic module power supply or AC mains power supply, or maintained by both solar photovoltaic modules and AC mains power supply, by controlling the maximum output power of the solar photovoltaic modules and the closing of the control switch.

[0034] When the target device is powered by solar photovoltaic modules, the power supply state is switched to a combination of solar photovoltaic modules and AC mains power, or the power supply of solar photovoltaic modules is maintained, depending on the maximum output power of the solar photovoltaic modules, the required total power of the target device, and the closing of the control switch.

[0035] When the target device is powered by AC mains power, the power supply status is switched to a combination of solar photovoltaic module and AC mains power supply, or AC mains power supply is maintained, by adjusting the output voltage of the solar photovoltaic module and closing the control switch.

[0036] Optionally, when the target device is powered by both solar photovoltaic modules and AC mains power, switching the power supply to solar photovoltaic module power supply by controlling the maximum output power of the solar photovoltaic modules and closing the control switch includes:

[0037] When the target device is powered by both solar photovoltaic modules and AC mains power, if the maximum output power of the solar photovoltaic modules is greater than or equal to the required total power, then the control switch 2 stops working.

[0038] Adjust the switching frequency and duty cycle of switch 1 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through the Boost circuit 2 is 0.

[0039] After disconnecting switch 2, switch 3 is closed, and switch tube 2 starts working, switching the power supply to the solar photovoltaic module.

[0040] Optionally, when the target device is powered by both solar photovoltaic modules and AC mains power, switching the power supply to AC mains power by controlling the maximum output power of the solar photovoltaic modules and closing the control switch includes:

[0041] When the target device is powered by both solar photovoltaic modules and AC mains power, if the maximum output power of the solar photovoltaic modules is less than the power threshold, then the control switch 1 stops working.

[0042] Adjust the switching frequency and duty cycle of the switching transistor 2 so that the voltage of the DC bus is greater than the output voltage of the solar photovoltaic module and the current flowing through the Boost circuit 1 is 0.

[0043] After disconnecting switch 1 and closing switch 3, switch tube 1 starts working, and the power supply status is switched to AC mains power supply.

[0044] Optionally, when the target device is powered by AC mains, switching the power supply to a combined power supply of solar photovoltaic modules and AC mains by adjusting the output voltage of the solar photovoltaic modules and closing the control switch includes:

[0045] When the target device is powered by AC mains, if the output voltage of the solar photovoltaic module is greater than the voltage threshold, the control switch 1 will stop working.

[0046] Adjust the switching frequency and duty cycle of the switching transistor 2 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through the Boost circuit 1 is 0.

[0047] After disconnecting switch 3, switch 1 is closed, and switch tube 1 starts working, switching the power supply to a combination of solar photovoltaic modules and AC mains power.

[0048] Optionally, after determining the operating state of the target device, the current passing through the Boost circuit 1 and the Boost circuit 2 is distributed by controlling the switching frequency and duty cycle of the switching transistor 1 in the Boost circuit 1 and the switching frequency and duty cycle of the switching transistor 2 in the Boost circuit 2, respectively, so as to reduce the power consumption and temperature rise rate of the components in the Boost circuit.

[0049] Optionally, when the target device is normally shut down, the load is stopped first, then switches 1 and 2 are disconnected, and when the current flowing through switch 3 is less than the current threshold, switch 3 is disconnected.

[0050] Optionally, in the event of an emergency power outage of the target device, switch 1 and switch 2 are simultaneously disconnected and all loads are stopped, and finally switch 3 is disconnected.

[0051] Beneficial effects of the embodiments in this application:

[0052] This application provides a hybrid power supply control method. As the current is shunt between Boost circuit 1 and Boost circuit 2, the actual operating current in each Boost circuit decreases. Therefore, the power consumption and temperature rise of components such as inductors, diodes, and switching transistors decrease, extending the lifespan of components, improving circuit reliability, and reducing the power consumption of the target device itself. Furthermore, the simultaneous operation of the two Boost circuits, forming an interleaved parallel PFC circuit, can improve the power factor, reduce output voltage ripple, enhance circuit reliability, and extend the lifespan of critical components.

[0053] Of course, implementing any product or method of this application does not necessarily require achieving all of the above advantages at the same time. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 A schematic diagram of a hybrid power supply circuit provided in an embodiment of this application;

[0056] Figure 2 A flowchart illustrating a hybrid power supply control method provided in this application embodiment;

[0057] Figure 3 A flowchart illustrating a hybrid power supply control process provided in this application embodiment;

[0058] Figure 4 This is a schematic diagram of the structure of a hybrid power supply control device provided in an embodiment of this application;

[0059] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] In the following description, the use of suffixes such as "module," "part," or "unit" to denote components is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module" and "part" may be used interchangeably.

[0062] To address the problems mentioned in the background art, according to one aspect of an embodiment of this application, a hybrid power supply circuit is provided, such as... Figure 1 As shown, the circuit includes switches 1, 2, and 3. Switch 1 is connected to the output of the solar photovoltaic module on one side and to the input of Boost converter 1 and one side of switch 3 on the other. Switch 2 is connected to the AC mains output on one side and to the input of the rectifier bridge on the other, used to control the AC mains power supply. Switch 3 is connected to the output of the rectifier bridge and the input of Boost converter 2 on the other side. A large-value capacitor is connected between the positive and negative terminals of the DC bus, serving the functions of energy storage, voltage regulation, and filtering. The inverter typically uses an Intelligent Power Module (IPM) to drive the compressor through frequency conversion by controlling the switching transistors inside the inverter.

[0063] Switch 1 is used to control the power supply of the solar photovoltaic module. When switch 1 is closed, the solar photovoltaic module can supply power to the compressor. When switch 1 is open, the solar photovoltaic module cannot supply power to the compressor. Switch 2 is used to control the power supply of AC mains. When switch 2 is closed, AC mains can supply power to the compressor. When switch 2 is open, AC mains cannot supply power to the compressor. Switch 3 enables the solar photovoltaic module and AC mains to be powered together when it is open, and enables the solar photovoltaic module or AC mains to be powered separately when it is closed.

[0064] When switches 1 and 3 are closed and switch 2 is open, the solar photovoltaic module is powered by Boost circuit 1 and Boost circuit 2; when switches 2 and 3 are closed and switch 1 is open, the AC mains power is powered by Boost circuit 1 and Boost circuit 2; when switches 1 and 2 are closed and switch 3 is open, the solar photovoltaic module is powered by Boost circuit 1 and the AC mains power is powered by Boost circuit 2.

[0065] This application provides a hybrid power supply control method that can be applied to target devices to improve circuit utilization when using a hybrid power supply of mains and photovoltaic power. The target device can be a variable frequency device such as a refrigerator or air conditioner.

[0066] The following will describe in detail a hybrid power supply control method provided in the embodiments of this application, with reference to specific implementation methods. Figure 2 As shown, the specific steps are as follows:

[0067] Step 201: During the startup process of the target device, the output voltage of the solar photovoltaic module and the closing of the control switch enable the Boost boost circuit 1 and Boost boost circuit 2 to work together to provide power.

[0068] Among them, Boost circuit 1 is used to boost the output voltage of the solar photovoltaic module to the DC bus voltage, and Boost circuit 2 is used to boost the output voltage of the AC mains to the DC bus voltage.

[0069] In this embodiment, during the power-on process of the target device, the target device obtains the output voltage of the solar photovoltaic module through a voltage detection circuit. Based on a comparison between the output voltage and a voltage threshold, it determines whether to use the solar photovoltaic module alone for power supply or to use a combination of the solar photovoltaic module and AC mains power. Regardless of the power supply method used, a switch must be controlled to close to achieve the desired power supply. The switch can be a DC contactor, DC relay, etc., and this application does not specifically limit the type of switch.

[0070] Whether the solar photovoltaic module is used for power supply alone or the solar photovoltaic module and AC mains power are used together, the power supply is achieved by controlling the closing of the switch and using Boost boost circuit 1 and Boost boost circuit 2.

[0071] Step 202: During the operation of the target device, the maximum output power of the solar photovoltaic module and the closing of the control switch are used to achieve power supply by using Boost boost circuit 1 and Boost boost circuit 2 together.

[0072] In this embodiment, during the operation of the target device, the target device uses a maximum power point tracking algorithm to determine the maximum output power of the solar photovoltaic module. By comparing the maximum output power with a power threshold and the required total power of the target device, the power supply state is determined. The power supply states include: solar photovoltaic module powered alone, AC mains powered alone, or solar photovoltaic module and AC mains powered together. Each power supply state is achieved by controlling the closing of a switch to enable the Boost converter 1 and Boost converter 2 to be powered together.

[0073] In this application, during the startup and operation of the target device, regardless of the power supply state, the target device uses both Boost converter 1 and Boost converter 2 for power supply, thereby improving circuit utilization. Since the current is shunt between Boost converter 1 and Boost converter 2, the inductors, diodes, and switching transistors in the Boost converter circuits can be of lower rated current, reducing the selection requirements for key components in the Boost converter circuits.

[0074] For example, if the target device operates at maximum power with a current of 10A, and if only the solar photovoltaic modules provide power, and the current only passes through Boost circuit 1, then inductor 1, diode 1, and switch 1 must all be selected with a rated current greater than 10A, and sufficient margin must be ensured. In this application, since the current passes through both Boost circuit 1 and Boost circuit 2 simultaneously, the current of a single Boost circuit will not reach 10A, reducing the selection requirements for the inductor, diode, and switch in the Boost circuit.

[0075] Furthermore, as the current is shunt between Boost circuit 1 and Boost circuit 2, the actual operating current in each Boost circuit decreases. This reduces the power consumption and temperature rise of components such as inductors, diodes, and switching transistors, extending component lifespan, improving circuit reliability, and reducing the target device's own power consumption. In addition, the simultaneous operation of the two Boost circuits, forming an interleaved parallel PFC circuit, improves the power factor, reduces output voltage ripple, enhances circuit reliability, and extends the lifespan of critical components.

[0076] As an optional implementation, during the power-on process of the target device, the combined power supply of Boost circuit 1 and Boost circuit 2 is achieved by controlling the output voltage of the solar photovoltaic module and the closing of the control switch. This includes: when the target device is powered on, closing switch 2 and detecting the output voltage of the solar photovoltaic module through a voltage detection circuit, wherein switch 2 is used to control the power supply of AC mains; when the output voltage is less than the voltage threshold, AC mains power supply is achieved by opening switch 1 and closing switch 3, wherein opening switch 1 and closing switches 2 and 3 allows the AC mains current to flow through Boost circuit 1 and Boost circuit 2 to provide power; when the output voltage is greater than or equal to the voltage threshold, the combined power supply of the solar photovoltaic module and AC mains is achieved by closing switch 1 and opening switch 3, wherein closing switches 1 and 2 and opening switch 3 allows the current of the solar photovoltaic module to flow through Boost circuit 1 and the current of the AC mains to flow through Boost circuit 2 to provide power.

[0077] In this embodiment, when the target device is turned on, switch 2 is closed, and the output voltage DC+ of the solar photovoltaic module is detected by the voltage detection circuit to determine whether DC+ is greater than or equal to the voltage threshold Vst. If DC+ < Vst, the solar photovoltaic module cannot supply power, switch 1 is opened, switch 3 is closed, and AC mains power supplies DC bus through Boost boost circuit 1 and Boost boost circuit 2. If DC+ ≥ Vst, switch 1 is closed, switch 3 is opened, and the current of the solar photovoltaic module passes through Boost boost circuit 1 and AC mains power passes through Boost boost circuit 2 to jointly supply DC bus. The DC bus supplies power to the internal load of the target device, such as the compressor.

[0078] As an optional implementation, when the output voltage is less than the voltage threshold, the AC mains power supply is achieved by disconnecting switch 1 and closing switch 3, which includes: when the output voltage is less than the voltage threshold, power is supplied through the Boost boost circuit 2 by disconnecting switch 1 and switch 3 and closing switch 2; when the current of the DC bus exceeds the set current or the power of the DC bus exceeds the set power, switch 3 is closed; and the AC mains power is controlled to pass through switch 2 and switch 3, and is jointly supplied through the Boost boost circuit 1 and Boost boost circuit 2.

[0079] If DC+ < Vst, the solar photovoltaic modules cannot supply power. In this case, do not close switch 3 initially; instead, disconnect switches 1 and 3. The AC mains power, after passing through switch 2, supplies power to the DC bus via boost circuit 2. Once the DC bus current exceeds the set current or the DC bus power exceeds the set power, close switch 3. At this point, AC mains power will simultaneously supply power through boost circuits 1 and 2. This avoids large errors in current and power detection caused by splitting power and current into two paths, resulting in smaller power and current in each boost circuit when the total current or total power is low.

[0080] As an optional implementation, during the operation of the target equipment, power supply using Boost circuit 1 and Boost circuit 2 is achieved by controlling the maximum output power of the solar photovoltaic modules and the closing of control switches. This includes: determining the maximum output power of the solar photovoltaic modules using a maximum power point tracking algorithm; when the maximum output power is less than a power threshold, supplying AC mains power by opening switch 1 and closing switches 2 and 3, wherein opening switch 1 and closing switches 2 and 3 allows the AC mains current to flow through Boost circuit 1 and Boost circuit 2 to supply power; when the maximum output power is greater than or equal to the power threshold, determining whether the maximum output power is greater than or equal to the required total power of the target equipment; when the maximum output power is greater than or equal to the required total power, supplying power to the solar photovoltaic modules by closing switches 1 and 3 and opening switch 2, wherein closing switches 1 and 3 and opening switch 2 allows the current of the solar photovoltaic modules to flow through Boost circuit 1 and Boost circuit 2 to supply power. The boost circuit 1 and the boost circuit 2 provide power. When the maximum output power is less than the required total power, the solar photovoltaic module and the AC mains power are supplied together by closing switch 1 and switch 2 and opening switch 3. The closing of switch 1 and switch 2 and opening of switch 3 is used to allow the current of the solar photovoltaic module to pass through the boost circuit 1 and the current of the AC mains power to pass through the boost circuit 2 to provide power.

[0081] In this embodiment, the target device adjusts the switching frequency and duty cycle of the switching transistor 1 to enable the solar photovoltaic module to output power at the maximum power point. The maximum power point tracking algorithm is executed through the Boost boost circuit 1 to determine the maximum output power pdc of the solar photovoltaic module. Then, Pdc is compared with the power threshold Pst.

[0082] If Pdc < Pst, it indicates that the solar photovoltaic module's output energy is insufficient, and the solar photovoltaic module needs to be turned off. First, switch 1 should be stopped, then switch 1 should be opened, and then switches 3 and 2 should be closed to use AC mains power.

[0083] If Pdc ≥ Pst, compare the magnitudes of Pdc and Pout. Here, pout is the required total power of the target device, which is calculated based on the current operating frequency of the target device. For example, if the target device is an air conditioner, the air conditioner calculates its current operating frequency based on the current temperature and humidity, and then calculates the required total power of the air conditioner based on the current operating frequency.

[0084] If Pdc < Pout, it indicates that the power of the solar photovoltaic module is insufficient and AC mains power is also required. Then, by controlling the switching frequency and duty cycle of switch tube 2, the output power Pac of AC mains is determined, so that Pac is greater than or equal to the preset power Pout - Pdc. Then, switch 1 and switch 2 are closed and switch 3 is opened to achieve the joint power supply of solar photovoltaic module and AC mains.

[0085] If Pdc≥Pout, it means that only the solar photovoltaic module needs to be powered and the AC mains power is not required. First, switch 2 is not working. Then, switch 1 is closed, switch 2 is opened, and then switch 3 is closed to enable power supply to the solar photovoltaic module.

[0086] The components in a Boost converter circuit include inductors, diodes, and switching transistors. During the power supply process described above, after determining the operating state of the target device, the current flowing through Boost converter circuits 1 and 2 is distributed by controlling the switching frequency and duty cycle of switching transistor 1 in Boost converter circuit 1 and the switching frequency and duty cycle of switching transistor 2 in Boost converter circuit 2, respectively. This reduces the power consumption and temperature rise rate of the components in the Boost converter circuits.

[0087] As an optional implementation, after the target device is running, the method further includes: switching between different power supply states by controlling the closing of a switch, wherein each power supply state is powered by both Boost boost circuit 1 and Boost boost circuit 2.

[0088] Specifically, it includes the following three states:

[0089] State 1: The solar photovoltaic module and AC mains power are supplied at the same time. When switch 1 and switch 2 are closed, switch 3 is open. The solar photovoltaic module supplies power to the DC bus through Boost circuit 1 and the AC mains power through Boost circuit 2.

[0090] State 2: The solar photovoltaic module is powered independently. When switch 1 and switch 3 are closed and switch 2 is open, the solar photovoltaic module supplies power to the DC bus through Boost circuit 1 and Boost circuit 2.

[0091] State 3: AC mains power supply is independent. When switch 2 and switch 3 are closed, switch 1 is opened, and AC mains power supplies the DC bus through Boost circuit 1 and Boost circuit 2.

[0092] Optionally, switching between different power supply states can be achieved by controlling the closing of the switch, including:

[0093] First, when the target equipment is powered by both solar photovoltaic modules and AC mains power, the power supply status can be switched to solar photovoltaic module power supply or AC mains power supply, or to maintain both solar photovoltaic module power supply and AC mains power supply, by controlling the maximum output power of the solar photovoltaic modules and the closing of the control switch. That is, state 1 can be switched to state 2 or state 3, or state 1 can be maintained.

[0094] When the air conditioner is operating in state 1, calculate the maximum output power Pdc of the solar photovoltaic module. Compare Pdc with the power threshold Pst; if Pdc < Pst, it is determined that the output energy of the solar photovoltaic module is insufficient, and the solar photovoltaic module needs to be turned off. First, switch 1 is not working, then switch 1 is opened, and then switch 3 is closed, switch 1 is working, and the system enters state 3. If Pdc ≥ Pst, compare Pdc with Pout. If Pdc < Pout, maintain state 1. By controlling the switching frequency and duty cycle of switch 2, the output power Pac of the AC mains is controlled, making Pac greater than or equal to Pout - Pdc; if Pdc ≥ Pout, only solar photovoltaic power is needed, and AC mains power is not needed. First, switch 2 is not working, then switch 2 is opened, and then switch 3 is closed, switch 2 is working, and the system enters state 2.

[0095] Second, when the target equipment is powered by solar photovoltaic modules, the power supply state can be switched to a combination of solar photovoltaic modules and AC mains power, or the solar photovoltaic modules can be kept powered, depending on the maximum output power of the solar photovoltaic modules, the required total power of the target equipment, and the closing of the control switch. That is, state 2 can be switched to state 1 or state 2 can be kept.

[0096] The maximum power point tracking algorithm is used to calculate the maximum output power Pdc of the solar photovoltaic module. Pdc is compared with Pout; if Pdc ≥ Pout, state 2 is maintained; if Pdc < Pout, the solar photovoltaic module and AC mains power need to be supplied simultaneously. First, switch 2 is not working, then switch 3 is opened, and then switch 2 is closed. Switch 2 is then working, and state 1 is entered.

[0097] Third, when the target equipment is powered by AC mains, the power supply state can be switched to a combination of solar photovoltaic modules and AC mains power supply, or AC mains power supply can be maintained, by adjusting the output voltage of the solar photovoltaic modules and the closing of the control switch. That is, state 1 can be switched to state 3, or state 1 can be maintained.

[0098] The output voltage DC+ of the solar photovoltaic module is detected by a voltage detection circuit; it is then determined whether DC+ is greater than or equal to the voltage threshold Vst; if DC+ < Vst, state 3 is maintained. If DC+ ≥ Vst, the solar photovoltaic module can supply power. First, switch 1 is not working, then switch 3 is opened, and then switch 1 is closed, switch 1 is working, and state 1 is entered.

[0099] As an alternative implementation, since there will be a DC arc when the switch of direct current is turned off, and the DC arc generated at high current will damage the contacts of the switch and shorten the service life of the switch. Therefore, when it is necessary to disconnect switch 1, a suitable control method is required to prevent the DC arc. In this application, the closing or opening of switch 3 is performed when the current flowing through switch 3 is very small, which can prevent the generation of DC arc in switch 3. The specific control methods include the following five types:

[0100] (1) When the target device is normally shut down, first stop the load, then disconnect switch 1 and switch 2, and when the current flowing through switch 3 is less than the current threshold, disconnect switch 3.

[0101] (2) When the target device is emergently powered off, disconnect switch 1, switch 2 and stop all loads simultaneously, and finally disconnect switch 3.

[0102] (3) When the target device is powered by both solar photovoltaic modules and AC mains, if the maximum output power of the solar photovoltaic modules is greater than or equal to the required total machine power (the target device is operating in state 1, and pdc≥pout), only the solar photovoltaic modules can be used for power supply, then control switch tube 2 to stop working; adjust the switching frequency and duty cycle of switch tube 1 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through Boost boost circuit 2 is 0, then the current flowing through switch 3 is 0; after disconnecting switch 2, close switch 3, and the power supply state switches to state 2.

[0103] (4) When the target device is powered by both solar photovoltaic modules and AC mains, if the maximum output power of the solar photovoltaic modules is less than the power threshold (the target device is operating in state 1, and pdc<Pst), the solar photovoltaic modules are not sufficient to supply power, then control switch tube 1 to stop working; adjust the switching frequency and duty cycle of switch tube 2 so that the voltage of the DC bus is greater than the output voltage of the solar photovoltaic modules and the current flowing through Boost boost circuit 1 is 0, then the current flowing through switch 3 is 0; after disconnecting switch 1, close switch 3, and the power supply state switches to state 3.

[0104] (5) When the target device is powered by AC mains, if the output voltage of the solar photovoltaic modules is greater than the voltage threshold (the target device is operating in state 3, and DC+≥Vst), the solar photovoltaic modules can supply power, then control switch tube 1 to stop working; adjust the switching frequency and duty cycle of switch tube 2 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through Boost boost circuit 1 is 0, then the current flowing through switch 3 is 0; after disconnecting switch 3, close switch 1, and the power supply state switches to state 1.

[0105] Optionally, embodiments of this application also provide a processing flowchart of a hybrid power supply control method, such as... Figure 3 As shown.

[0106] Based on the same technical concept, embodiments of this application also provide a hybrid power supply control device, such as... Figure 4 As shown, the device includes:

[0107] The first power supply module 401 is used to provide power to the target device by means of the output voltage of the solar photovoltaic module and the closing of the control switch during the power-on process, using the Boost boost circuit 1 and Boost boost circuit 2 together. The Boost boost circuit 1 is used to boost the output voltage of the solar photovoltaic module to the DC bus voltage, and the Boost boost circuit 2 is used to boost the output voltage of the AC mains to the DC bus voltage.

[0108] The second power supply module 402 is used to provide power to the target equipment by using the maximum output power of the solar photovoltaic module and the closing of the control switch, thereby enabling the Boost boost circuit 1 and Boost boost circuit 2 to work together.

[0109] Optionally, the first power supply module 401 is used for:

[0110] When the target device is turned on, switch 2 is closed, and the output voltage of the solar photovoltaic module is detected by the voltage detection circuit. Switch 2 is used to control the power supply of AC mains.

[0111] When the output voltage is less than the voltage threshold, AC mains power is supplied by disconnecting switch 1 and closing switch 3. Specifically, disconnecting switch 1 and closing switches 2 and 3 allows the AC mains current to pass through Boost circuit 1 and Boost circuit 2 to supply power.

[0112] When the output voltage is greater than or equal to the voltage threshold, the solar photovoltaic module and the AC mains power are supplied together by closing switch 1 and opening switch 3. Specifically, closing switch 1 and switch 2 and opening switch 3 are used to allow the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the AC mains power to pass through the Boost circuit 2 to supply power.

[0113] Optionally, the first power supply module 401 is used for:

[0114] When the output voltage is less than the voltage threshold, power is supplied through the Boost circuit 2 by disconnecting switch 1 and switch 3 and closing switch 2;

[0115] If the current of the DC bus exceeds the set current or the power of the DC bus exceeds the set power, close switch 3;

[0116] The AC mains power is controlled by switches 2 and 3, and is jointly powered by Boost circuit 1 and Boost circuit 2.

[0117] Optionally, the second power supply module 402 is used for:

[0118] The maximum power point tracking algorithm is used to determine the maximum output power of a solar photovoltaic module;

[0119] When the maximum output power is less than the power threshold, AC mains power is supplied by disconnecting switch 1 and closing switches 2 and 3. Disconnecting switch 1 and closing switches 2 and 3 is used to allow the AC mains current to pass through Boost circuit 1 and Boost circuit 2 to supply power.

[0120] When the maximum output power is greater than or equal to the power threshold, determine whether the maximum output power is greater than or equal to the required total power of the target device;

[0121] When the maximum output power is greater than or equal to the required total power, the solar photovoltaic module is powered by closing switch 1 and switch 3 and opening switch 2. The closing of switch 1 and switch 3 and opening of switch 2 is used to allow the current of the solar photovoltaic module to be powered through Boost circuit 1 and Boost circuit 2.

[0122] When the maximum output power is less than the required total power, the solar photovoltaic module and AC mains power can be supplied together by closing switch 1 and switch 2 and opening switch 3. The closing of switch 1 and switch 2 and opening of switch 3 is used to allow the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the AC mains power to pass through the Boost circuit 2 to supply power.

[0123] Optionally, the second power supply module 402 is used for:

[0124] When the maximum output power is less than the required total power, the required output power of the AC mains is determined by controlling the switching frequency and duty cycle of the switching transistor 2 in the Boost circuit 2. The required output power is greater than the preset power.

[0125] Optionally, the device is also used for:

[0126] By controlling the closing of the switch, the state switching between different power supply states is realized. Each power supply state is powered by both Boost circuit 1 and Boost circuit 2.

[0127] Optionally, the device is also used for:

[0128] When the target equipment is powered by both solar photovoltaic modules and AC mains power, the power supply status is switched to solar photovoltaic module power supply or AC mains power supply, or maintained by both solar photovoltaic modules and AC mains power supply, by controlling the maximum output power of the solar photovoltaic modules and the closing of the control switch.

[0129] When the target equipment is powered by solar photovoltaic modules, the power supply status is switched to a combination of solar photovoltaic modules and AC mains power, or the power supply of solar photovoltaic modules is maintained, depending on the maximum output power of the solar photovoltaic modules, the required total power of the target equipment, and the closing of the control switch.

[0130] When the target equipment is powered by AC mains, the power supply status is switched to a combination of solar photovoltaic modules and AC mains power supply, or AC mains power supply is maintained, by adjusting the output voltage of the solar photovoltaic modules and closing the control switch.

[0131] Optionally, the device is also used for:

[0132] When the target equipment is powered by both solar photovoltaic modules and AC mains power, if the maximum output power of the solar photovoltaic modules is greater than or equal to the required total power, then control switch 2 will stop working.

[0133] Adjust the switching frequency and duty cycle of switch 1 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through the Boost circuit 2 is 0.

[0134] After disconnecting switch 2, switch 3 is closed, and switch tube 2 starts working, switching the power supply to the solar photovoltaic module.

[0135] Optionally, the device is also used for:

[0136] When the target device is powered by both solar photovoltaic modules and AC mains power, if the maximum output power of the solar photovoltaic modules is less than the power threshold, then control switch 1 will stop working.

[0137] Adjust the switching frequency and duty cycle of switch 2 so that the voltage of the DC bus is greater than the output voltage of the solar photovoltaic module and the current flowing through the Boost circuit 1 is 0.

[0138] After disconnecting switch 1 and closing switch 3, switch tube 1 starts working, and the power supply status is switched to AC mains power supply.

[0139] Optionally, the second power supply module 402 is used for:

[0140] When the target device is powered by AC mains, if the output voltage of the solar photovoltaic module is greater than the voltage threshold, the control switch 1 will stop working.

[0141] Adjust the switching frequency and duty cycle of switch 2 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through the Boost circuit 1 is 0.

[0142] After disconnecting switch 3, switch 1 is closed, and switch tube 1 starts working, switching the power supply to a combination of solar photovoltaic modules and AC mains power.

[0143] Optionally, the device is also used for:

[0144] After determining the operating status of the target device, the current passing through the Boost circuit 1 and Boost circuit 2 is distributed by controlling the switching frequency and duty cycle of the switching transistor 1 in the Boost circuit 1 and the switching frequency and duty cycle of the switching transistor 2 in the Boost circuit 2, respectively, so as to reduce the power consumption and temperature rise rate of the components in the Boost circuit.

[0145] Optionally, the device is also used for:

[0146] When the target device is shut down normally, first stop the load, then disconnect switches 1 and 2. When the current flowing through switch 3 is less than the current threshold, disconnect switch 3.

[0147] Optionally, the device is also used for:

[0148] In the event of an emergency power outage of the target equipment, simultaneously disconnect switch 1, switch 2, and stop all loads, and finally disconnect switch 3.

[0149] According to another aspect of the embodiments of this application, this application provides an electronic device, such as... Figure 5 As shown, the system includes a memory 503, a processor 501, a communication interface 502, and a communication bus 504. The memory 503 stores a computer program that can run on the processor 501. The memory 503 and the processor 501 communicate through the communication interface 502 and the communication bus 504. When the processor 501 executes the computer program, it implements the steps of the above method.

[0150] The memory and processor in the aforementioned electronic devices communicate with each other via a communication bus and a communication interface. The communication bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into an address bus, a data bus, a control bus, etc.

[0151] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0152] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0153] According to another aspect of the embodiments of this application, a computer-readable medium having processor-executable non-volatile program code is also provided.

[0154] Optionally, in embodiments of this application, the computer-readable medium is configured to store program code for the processor to execute the above-described method.

[0155] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0156] In specific implementation, the embodiments of this application can be referred to the above embodiments and have corresponding technical effects.

[0157] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0158] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0159] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0160] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0161] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0162] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0163] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0164] If the aforementioned function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks. It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the absence of further restrictions, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0165] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A hybrid power supply circuit, characterized in that, The circuit includes: Switch 1 is connected to the output terminal of the solar photovoltaic module on one side and to the input terminal of Boost circuit 1 and one side of switch 3 on the other side, respectively, for controlling the power supply of the solar photovoltaic module. The power supply of the solar photovoltaic module is provided by Boost circuit 1 and Boost circuit 2 when switch 1 and switch 3 are closed and switch 2 is open. Switch 2 has one side connected to the output terminal of the mains power and the other side connected to the input terminal of the rectifier bridge. It is used to control the power supply of AC mains power. The AC mains power supply is used to supply power through Boost circuit 1 and Boost circuit 2 when switch 2 and switch 3 are closed and switch 1 is open. Switch 3, on the other side of which is connected to the output terminal of the rectifier bridge and the input terminal of the Boost circuit 2, is used to enable the solar photovoltaic module and AC mains power to be supplied together when it is open, and to enable the solar photovoltaic module or AC mains power to be supplied separately when it is closed. The solar photovoltaic module and AC mains power supply is used to supply power through the Boost circuit 1 and Boost circuit 2 when switches 1 and 2 are closed and switch 3 is open.

2. A hybrid power supply control method, characterized in that, The method includes: During the startup process of the target device, the output voltage of the solar photovoltaic module and the closing of the control switch in the hybrid power supply circuit of claim 1 enable the joint power supply of Boost boost circuit 1 and Boost boost circuit 2. The Boost boost circuit 1 is used to boost the output voltage of the solar photovoltaic module to the DC bus voltage, and the Boost boost circuit 2 is used to boost the output voltage of the AC mains to the DC bus voltage. During the operation of the target device, the maximum output power of the solar photovoltaic module and the closing of the control switch in the hybrid power supply circuit described in claim 1 enable the Boost boost circuit 1 and Boost boost circuit 2 to be powered together.

3. The method according to claim 2, characterized in that, The process of powering on the target device by using the output voltage of the solar photovoltaic module and the closing of the control switch to achieve power supply through the combined operation of Boost converter 1 and Boost converter 2 includes: When the target device is turned on, switch 2 is closed, and the output voltage of the solar photovoltaic module is detected by the voltage detection circuit. The switch 2 is used to control the power supply of AC mains. When the output voltage is less than the voltage threshold, AC mains power is supplied by disconnecting switch 1 and closing switch 3. The disconnection of switch 1 and the closing of switches 2 and 3 are used to allow the AC mains current to pass through the Boost boost circuit 1 and Boost boost circuit 2 to supply power. When the output voltage is greater than or equal to the voltage threshold, the solar photovoltaic module and the AC mains power are jointly supplied by closing switch 1 and opening switch 3. Specifically, closing switch 1 and switch 2 and opening switch 3 are used to allow the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the AC mains power to pass through the Boost circuit 2 to supply power.

4. The method according to claim 3, characterized in that, When the output voltage is less than the voltage threshold, the AC mains power supply is achieved by disconnecting switch 1 and closing switch 3, including: When the output voltage is less than the voltage threshold, power is supplied through the Boost circuit 2 by disconnecting switch 1 and switch 3 and closing switch 2; If the current of the DC bus exceeds the set current or the power of the DC bus exceeds the set power, close switch 3; The AC mains power is controlled by switches 2 and 3, and is jointly powered by Boost circuit 1 and Boost circuit 2.

5. The method according to claim 2, characterized in that, During the operation of the target device, the power supply is achieved by using Boost converter 1 and Boost converter 2 together through the maximum output power of the solar photovoltaic modules and the closing of the control switch, including: The maximum power point tracking algorithm is used to determine the maximum output power of a solar photovoltaic module; When the maximum output power is less than the power threshold, AC mains power is supplied by disconnecting switch 1 and closing switches 2 and 3. Disconnecting switch 1 and closing switches 2 and 3 allows the AC mains current to pass through the Boost circuit 1 and Boost circuit 2 to supply power. When the maximum output power is greater than or equal to the power threshold, it is determined whether the maximum output power is greater than or equal to the required total power of the target device; When the maximum output power is greater than or equal to the required total power, the solar photovoltaic module is powered by closing switch 1 and switch 3 and opening switch 2. The closing of switch 1 and switch 3 and opening of switch 2 is used to allow the current of the solar photovoltaic module to be supplied through the Boost circuit 1 and Boost circuit 2. When the maximum output power is less than the required total power, the solar photovoltaic module and AC mains power are supplied together by closing switch 1 and switch 2 and opening switch 3. The closing of switch 1 and switch 2 and opening of switch 3 is used to allow the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the AC mains power to pass through the Boost circuit 2 to supply power.

6. The method according to claim 5, characterized in that, When the maximum output power is less than the required total power, the combined power supply of the solar photovoltaic modules and AC mains power is achieved by closing switches 1 and 2 and opening switch 3, including: When the maximum output power is less than the required total power, the required output power of the AC mains is determined by controlling the switching frequency and duty cycle of the switching transistor 2 in the Boost circuit 2, wherein the required output power is greater than the preset power.

7. The method according to claim 2, characterized in that, After the target device is operational, the method further includes: By controlling the closing of the switch, the state switching between different power supply states is realized. Each power supply state is powered by both the Boost boost circuit 1 and the Boost boost circuit 2.

8. The method according to claim 7, characterized in that, The process of switching between different power supply states by controlling the closing of a switch includes: When the target device is powered by both solar photovoltaic modules and AC mains power, the power supply status is switched to solar photovoltaic module power supply or AC mains power supply, or maintained by both solar photovoltaic modules and AC mains power supply, by controlling the maximum output power of the solar photovoltaic modules and the closing of the control switch. When the target device is powered by solar photovoltaic modules, the power supply state is switched to a combination of solar photovoltaic modules and AC mains power, or the power supply of solar photovoltaic modules is maintained, depending on the maximum output power of the solar photovoltaic modules, the required total power of the target device, and the closing of the control switch. When the target device is powered by AC mains power, the power supply status is switched to a combination of solar photovoltaic module and AC mains power supply, or AC mains power supply is maintained, by adjusting the output voltage of the solar photovoltaic module and closing the control switch.

9. The method according to claim 8, characterized in that, When the target device is powered by both solar photovoltaic modules and AC mains power, the power supply status is switched to solar photovoltaic module power supply by controlling the maximum output power of the solar photovoltaic modules and closing the control switch, including: When the target device is powered by both solar photovoltaic modules and AC mains power, if the maximum output power of the solar photovoltaic modules is greater than or equal to the required total power, then the control switch 2 stops working. Adjust the switching frequency and duty cycle of switch 1 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through the Boost circuit 2 is 0. After disconnecting switch 2, switch 3 is closed, and switch tube 2 starts working, switching the power supply to the solar photovoltaic module.

10. The method according to claim 8, characterized in that, When the target device is powered by both solar photovoltaic modules and AC mains power, the power supply status is switched to AC mains power supply by controlling the maximum output power of the solar photovoltaic modules and closing the control switch. When the target device is powered by both solar photovoltaic modules and AC mains power, if the maximum output power of the solar photovoltaic modules is less than the power threshold, then the control switch 1 will stop working. Adjust the switching frequency and duty cycle of the switching transistor 2 so that the voltage of the DC bus is greater than the output voltage of the solar photovoltaic module and the current flowing through the Boost circuit 1 is 0. After disconnecting switch 1 and closing switch 3, switch tube 1 starts working, and the power supply status is switched to AC mains power supply.

11. The method according to claim 8, characterized in that, When the target device is powered by AC mains, the power supply status is switched to a combined power supply of solar photovoltaic modules and AC mains by adjusting the output voltage of the solar photovoltaic modules and closing the control switch. When the target device is powered by AC mains, if the output voltage of the solar photovoltaic module is greater than the voltage threshold, the control switch 1 will stop working. Adjust the switching frequency and duty cycle of the switching transistor 2 so that the voltage of the DC bus is greater than the output voltage of the AC mains and the current flowing through the Boost circuit 1 is 0. After disconnecting switch 3, switch 1 is closed, and switch tube 1 starts working, switching the power supply to a combination of solar photovoltaic modules and AC mains power.

12. The method according to claim 4, characterized in that, After determining the operating status of the target device, the current passing through the Boost circuit 1 and the Boost circuit 2 is distributed by controlling the switching frequency and duty cycle of the switching transistor 1 in the Boost circuit 1 and the switching frequency and duty cycle of the switching transistor 2 in the Boost circuit 2, respectively, so as to reduce the power consumption and temperature rise rate of the components in the Boost circuit.

13. The method according to claim 2, characterized in that, When the target device is normally shut down, first stop the load, then disconnect switch 1 and switch 2. When the current flowing through switch 3 is less than the current threshold, disconnect switch 3.

14. The method according to claim 2, characterized in that, In the event of an emergency power outage of the target device, switch 1 and switch 2 are disconnected simultaneously, all loads are stopped, and finally switch 3 is disconnected.

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