WO2023115924A1

WO2023115924A1 - Photovoltaic energy storage circuit and control method thereof, photovoltaic air conditioning system, and photovoltaic air conditioner

Info

Publication number: WO2023115924A1
Application number: PCT/CN2022/106434
Authority: WO
Inventors: 陈宁宁; 黄猛; 王京; 安宏迪
Original assignee: 珠海格力电器股份有限公司
Priority date: 2021-12-20
Filing date: 2022-07-19
Publication date: 2023-06-29
Also published as: CN114285142A

Abstract

The present disclosure relates to the field of photovoltaic energy storage. Disclosed are a photovoltaic energy storage circuit, a photovoltaic air conditioning system, and a photovoltaic air conditioner. A positive output end of a photovoltaic cell in the photovoltaic energy storage circuit is connected to a source of a first MOS transistor; a drain of the first MOS transistor is connected to a positive input end of a conversion control module; a negative output end of the photovoltaic cell is connected to a drain of a second MOS transistor; a source of the second MOS transistor is connected to a negative input end of the conversion control module; a gate of the first MOS transistor and a gate of the second MOS transistor are electrically connected to the conversion control module.

Description

Photovoltaic energy storage circuit and its control method, photovoltaic air conditioning system and photovoltaic air conditioning

Cross References to Related Applications

This disclosure is based on the application with CN application number 202111560577.4 and the filing date is December 20, 2021, and claims its priority. The disclosure content of this CN application is hereby incorporated into this disclosure as a whole.

technical field

The present disclosure relates to the field of photovoltaic energy storage, in particular, to a photovoltaic energy storage circuit and a control method thereof, a photovoltaic air conditioning system and a photovoltaic air conditioner.

Background technique

A basic topology of a photovoltaic (storage) air-conditioning system known to the inventor is shown in Figure 1. A DC contactor is added on the photovoltaic side to isolate the photovoltaic from the air-conditioning system, but the cost is relatively high.

In order to reduce costs, the basic topology of another photovoltaic (storage) air-conditioning system known to the inventor is shown in Figure 2. The photovoltaic input side is directly connected to the photovoltaic DC/DC.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present disclosure provides a photovoltaic energy storage circuit and its control method, a photovoltaic air-conditioning system and a photovoltaic air-conditioner, so as to solve the problem that the existing photovoltaic air-conditioning system uses DC contactors with high cost instead of using DC contactors It is prone to temperature rise and the problem that it cannot be cut out when the connection is reversed.

The technical solution adopted by the disclosure to solve its technical problems is:

first,

An embodiment of the present disclosure provides a photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, and an energy storage system, and the conversion control module is connected to the energy storage system; it also includes:

The first MOS tube and the second MOS tube;

The positive output terminal of the photovoltaic cell is connected to the source of the first MOS transistor, and the drain of the first MOS transistor is connected to the positive input terminal of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the drain of the second MOS transistor, and the source of the second MOS transistor is connected to the negative input terminal of the conversion control module;

Both the gate of the first MOS transistor and the gate of the second MOS transistor are electrically connected to the conversion control module.

In some embodiments, the photovoltaic energy storage circuit further includes: a third MOS tube and a fourth MOS tube;

The negative output terminal of the photovoltaic cell is connected to the source of the third MOS transistor, and the drain of the third MOS transistor is connected to the positive input terminal of the conversion control module;

The positive output terminal of the photovoltaic cell is connected to the drain of the fourth MOS transistor, and the source of the fourth MOS transistor is connected to the negative input terminal of the conversion control module;

The gate of the third MOS transistor and the gate of the fourth MOS transistor are electrically connected to the conversion control module.

An embodiment of the present disclosure provides a photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, a first MOS tube, a second MOS tube, and an energy storage system, wherein:

The conversion control module is connected to the energy storage system;

The positive output end of the photovoltaic cell is connected to the first electrode of the first MOS transistor, and the second electrode of the first MOS transistor is connected to the positive input end of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the first electrode of the second MOS transistor, and the second electrode of the second MOS transistor is connected to the negative input terminal of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the first electrode of the third MOS transistor, and the second electrode of the third MOS transistor is connected to the positive input terminal of the conversion control module;

The positive output terminal of the photovoltaic cell is connected to the first electrode of the fourth MOS transistor, and the second electrode of the fourth MOS transistor is connected to the negative input terminal of the conversion control module;

Both the gate of the third MOS transistor and the gate of the fourth MOS transistor are electrically connected to the conversion control module.

In some embodiments, the conversion control module includes a control unit, an auxiliary power supply and a conversion circuit; the gate of the first MOS transistor, the gate of the second MOS transistor, the gate of the third MOS transistor, and the fourth MOS transistor The gates of the tubes are all connected to the control unit, the conversion circuit is connected to the energy storage system, and the auxiliary power supply is used to take power from the conversion circuit and supply power to the control unit.

In some embodiments, the conversion control module further includes: a sampling unit connected to the control unit, the sampling unit is used to sample whether the photovoltaic cell is reversed, and send the sampling result to the control unit A unit; the control unit is used to control the on-off of the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor according to the sampling result.

In some embodiments, the sampling unit is used for sampling the voltage between the positive output terminal and the negative output terminal of the photovoltaic cell.

In some embodiments, when the photovoltaic cell is positively connected, the first MOS transistor and the second MOS transistor are turned on, and the third MOS transistor and the fourth MOS transistor are turned off.

In some embodiments, when the photovoltaic cell is reversely connected, the first MOS transistor and the second MOS transistor are turned off, and the third MOS transistor and the fourth MOS transistor are turned on.

In some embodiments, the conversion circuit includes: a boost circuit, a charge and discharge controller, and a bidirectional controller;

One end of the boost circuit is connected to the input end of the conversion circuit, and the input end of the conversion circuit is the positive input end and the negative input end of the conversion control module;

One end of the charge and discharge controller is connected to the energy storage system, and the other end of the charge and discharge controller is connected to the other end of the conversion circuit;

One end of the bidirectional controller is connected to the other end of the charge and discharge controller, and the other end of the bidirectional controller is connected to a DC bus.

In some embodiments, the conversion control module is used to control the conduction of the first MOS transistor and the second MOS transistor, the third MOS transistor and the fourth MOS transistor when the photovoltaic cell is positively connected. tube is turned off; when the photovoltaic cell is reversely connected, the first MOS tube and the second MOS tube are controlled to be turned off, and the third MOS tube and the fourth MOS tube are turned on.

Second aspect,

An embodiment of the present disclosure provides a method for controlling a photovoltaic energy storage circuit, which is applied to the circuit described in the technical solution of the first aspect, and the method includes the following steps:

Obtain the wiring situation of the photovoltaic cell, and the wiring situation includes positive connection or reverse connection;

When the photovoltaic cell is positively connected, control the first MOS transistor and the second MOS transistor to be turned on, and the third MOS transistor and the fourth MOS transistor to be turned off;

When the photovoltaic cell is reversely connected, the first MOS transistor and the second MOS transistor are controlled to be turned off, and the third MOS transistor and the fourth MOS transistor are turned on.

third aspect,

An embodiment of the present disclosure provides a photovoltaic air-conditioning system, including the photovoltaic energy storage circuit described in any one of the technical solutions of the first aspect.

Fourth aspect,

An embodiment of the present disclosure provides a photovoltaic air conditioner, including the photovoltaic air conditioner system described in the technical solution of the third aspect.

Beneficial effect:

The technical solution of the present disclosure provides a photovoltaic energy storage circuit and its control method, as well as a photovoltaic air-conditioning system and a photovoltaic air-conditioner. Connect the positive input terminal of the conversion control module, the negative output terminal of the photovoltaic cell is connected to the drain of the second MOS tube, the source of the second MOS tube is connected to the negative input terminal of the conversion control module, the first MOS tube and the second MOS tube The grid is electrically connected to the conversion control module. In this way, the conversion control module can change the on-off of the first MOS transistor and the second MOS transistor by changing the gate signals of the first MOS transistor and the second MOS transistor, so as to realize the connection and disconnection of the photovoltaic cell and the conversion control module. On, the first MOS tube and the second MOS tube can be disconnected when the photovoltaic cell is reversely connected, so as to avoid the situation that the photovoltaic cell is still connected to the conversion control module and the temperature rises. The use of the first MOS transistor and the second MOS transistor does not require the use of a DC contactor, which has the advantage of low cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present disclosure. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a photovoltaic energy storage circuit using a DC contactor known to the inventor;

Fig. 2 is a schematic structural diagram of a photovoltaic energy storage circuit in which a photovoltaic cell is directly connected to a conversion control module known to the inventor;

Fig. 3 is a schematic structural diagram of a photovoltaic energy storage circuit provided by some embodiments of the present disclosure;

Fig. 4 is a schematic structural diagram of a photovoltaic energy storage circuit provided by other embodiments of the present disclosure;

Fig. 5 is a flowchart of a control method for a photovoltaic energy storage circuit provided by some embodiments of the present disclosure.

Detailed ways

In order to make the purpose, technical solution and advantages of the present disclosure clearer, the technical solution of the present disclosure will be described in detail below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments in the present disclosure, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present disclosure.

The inventor has noticed that the photovoltaic (storage) air-conditioning system shown in Figure 2 also brings new problems. During the process of photovoltaic terminal wiring in the engineering installation link, when the positive and negative poles of the photovoltaic battery are reversed, the output of the photovoltaic battery The electric energy of the photovoltaic cell has been consumed through the switch tube Q1 and the inductor L1, and at this time the photovoltaic cell is close to an open circuit, and the electric energy output by the photovoltaic cell will be converted into heat energy and consumed, which will aggravate the temperature rise problem of the controller. In addition, at this time, the sampling unit samples the input voltage of the photovoltaic cell and sends it to the control unit. The control unit judges that the positive and negative poles of the photovoltaic cell are reversed, and can report a fault, but cannot cut out the photovoltaic cell.

Referring to FIG. 3 , an embodiment of the present disclosure provides a photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, and an energy storage system, and the conversion control module is connected to the energy storage system. The photovoltaic energy storage circuit also includes:

The first MOS (metal oxide semiconductor, metal oxide semiconductor) transistor Q3 and the second MOS transistor Q4;

The positive output terminal of the photovoltaic cell is connected to the source of the first MOS transistor Q3, and the drain of the first MOS transistor Q3 is connected to the positive input terminal of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the drain of the second MOS transistor Q4, and the source of the second MOS transistor Q4 is connected to the negative input terminal of the conversion control module;

The gates of the first MOS transistor Q3 and the second MOS transistor Q4 are electrically connected to the conversion control module.

It should be noted that the positive output terminal of the photovoltaic cell is the positive pole of the photovoltaic cell when the photovoltaic cell is positively connected; the negative output terminal of the photovoltaic cell is the negative pole of the photovoltaic cell when the photovoltaic cell is positively connected; The negative terminal of the battery is the positive output terminal, and the positive terminal of the photovoltaic cell is the negative output terminal. The positive input terminal of the conversion control module is a port connected to the positive output terminal of the photovoltaic cell; the negative input terminal of the conversion control module is a port connected to the negative output terminal of the photovoltaic cell.

In the photovoltaic energy storage circuit provided by the embodiments of the present disclosure, the positive output terminal of the photovoltaic cell is connected to the source of the first MOS transistor, the drain of the first MOS transistor is connected to the positive input terminal of the conversion control module, and the negative output terminal of the photovoltaic cell is connected to the The drain of the second MOS transistor and the source of the second MOS transistor are connected to the negative input terminal of the conversion control module, and the gates of the first MOS transistor and the second MOS transistor are electrically connected to the conversion control module. In this way, the conversion control module can change the on-off of the first MOS transistor and the second MOS transistor by changing the gate signals of the first MOS transistor and the second MOS transistor, so as to realize the connection and disconnection of the photovoltaic cell and the conversion control module. On, the first MOS tube and the second MOS tube can be disconnected when the photovoltaic cell is reversely connected, so as to avoid the situation that the photovoltaic cell is still connected to the conversion control module and the temperature rises. The use of the first MOS transistor and the second MOS transistor does not require the use of a DC contactor, which has the advantage of low cost.

As shown in FIG. 4 , an embodiment of the present disclosure provides a photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, and an energy storage system, and the conversion control module is connected to the energy storage system. The photovoltaic energy storage circuit also includes:

The first MOS transistor Q3 and the second MOS transistor Q4;

Both the gate of the first MOS transistor Q3 and the gate of the second MOS transistor Q4 are electrically connected to the conversion control module.

The photovoltaic energy storage circuit also includes: a third MOS transistor Q5 and a fourth MOS transistor Q2;

The negative output terminal of the photovoltaic cell is connected to the source of the third MOS transistor Q5, and the drain of the third MOS transistor Q5 is connected to the positive input terminal of the conversion control module;

The positive output terminal of the photovoltaic cell is connected to the drain of the fourth MOS transistor Q2, and the source of the fourth MOS transistor Q2 is connected to the negative input terminal of the conversion control module;

Both the gate of the third MOS transistor Q5 and the gate of the fourth MOS transistor Q2 are electrically connected to the conversion control module.

Referring to FIG. 3 , an embodiment of the present disclosure provides another photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, a first MOS transistor Q3 , a second MOS transistor Q4 and an energy storage system.

The conversion control module is connected with the energy storage system;

The positive output terminal of the photovoltaic cell is connected to the first electrode of the first MOS transistor Q3, and the second electrode of the first MOS transistor Q3 is connected to the positive input terminal of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the first electrode of the second MOS transistor Q4, and the second electrode of the second MOS transistor Q4 is connected to the negative input terminal of the conversion control module;

In some embodiments, referring to FIG. 4 , the photovoltaic energy storage circuit further includes: a third MOS transistor Q5 and a fourth MOS transistor Q2 .

The negative output terminal of the photovoltaic cell is connected to the first electrode of the third MOS transistor Q5, and the second electrode of the third MOS transistor Q5 is connected to the positive input terminal of the conversion control module;

The positive output terminal of the photovoltaic cell is connected to the first electrode of the fourth MOS transistor Q2, and the second electrode of the fourth MOS transistor Q2 is connected to the negative input terminal of the conversion control module;

In some embodiments, any one of the MOS transistors mentioned above is an NMOS transistor or a PMOS transistor. For a certain MOS transistor, one of the first electrode and the second electrode is the source, and the other is the drain. For example, the first electrode of the first MOS transistor Q3 is the source, and the second electrode of the first MOS transistor Q3 is the drain; vice versa. For another example, the first electrode of the second MOS transistor Q4 is the source, and the second electrode of the second MOS transistor Q4 is the drain; vice versa is also possible. The third MOS transistor Q5 is similar to the fourth MOS transistor Q2 , which will not be repeated here.

In some embodiments, the conversion control module is used to control the first MOS tube and the second MOS tube to be turned on when the photovoltaic cell is positively connected, and the third MOS tube and the fourth MOS tube to be turned off; The first MOS transistor and the second MOS transistor are turned off, and the third MOS transistor and the fourth MOS transistor are turned on.

Some implementations of the conversion control module are introduced below in conjunction with different embodiments. The conversion control module is also called the conversion control circuit.

In some embodiments, the conversion control module includes a control unit (also referred to as a controller), an auxiliary power supply, and a conversion circuit. The gate of the first MOS transistor Q3, the gate of the second MOS transistor Q4, the gate of the third MOS transistor Q5, and the gate of the fourth MOS transistor Q2 are connected to the control unit, the conversion circuit is connected to the energy storage system, and the auxiliary power supply Used to take power from the conversion circuit and supply power to the control unit.

In some embodiments, the conversion control module further includes: a sampling unit (also referred to as a sampling circuit), connected to the control unit. The sampling unit is used to sample whether the photovoltaic cell is reversed, and send the sampling result to the control unit. The control unit is used for controlling on-off of the first MOS transistor Q3 , the second MOS transistor Q4 , the third MOS transistor Q5 and the fourth MOS transistor Q2 according to the sampling result. In some embodiments, the sampling unit is used for sampling the voltage between the positive output terminal and the negative output terminal of the photovoltaic cell.

When the voltage between the positive output terminal and the negative output terminal is positive, it indicates that the photovoltaic cell is positively connected, and when the voltage between the positive output terminal and the negative output terminal is negative, it indicates that the photovoltaic cell is reversely connected.

In some embodiments, when the photovoltaic cell is positively connected, the first MOS transistor Q3 and the second MOS transistor Q4 are turned on, and the third MOS transistor Q5 and the fourth MOS transistor Q2 are turned off. At this time, the positive output terminal of the photovoltaic cell is connected to the positive input terminal of the conversion control module, and the negative output terminal is connected to the negative input terminal of the conversion control module. That is, the positive pole of the photovoltaic cell is connected to the positive input terminal of the conversion control module, and the negative pole is connected to the negative input terminal of the conversion control module.

In some embodiments, when the photovoltaic cells are reversely connected, the first MOS transistor Q3 and the second MOS transistor Q4 are turned off, and the third MOS transistor Q5 and the fourth MOS transistor Q2 are turned on. At this time, the negative output terminal of the photovoltaic cell is connected to the positive input terminal of the conversion control module, and the positive output terminal is connected to the negative input terminal of the conversion control module. But in essence, the positive pole of the photovoltaic cell is still connected to the positive input terminal of the conversion control module, and the negative pole is connected to the negative input terminal of the conversion control module. Therefore, even if the photovoltaic battery is reversely connected, the photovoltaic battery can be connected correctly by changing the on-off of the four MOS tubes through the sampling unit and the control unit to ensure the normal operation of the photovoltaic energy storage circuit.

It should be noted that the control unit does not rely on the computer program to control the on-off of the MOS tube. Based on the on-off characteristics of the MOS tube, it only needs to control the voltage of the gate to control the on-off of the MOS tube. Therefore, the control unit It is only necessary to provide different voltages for the MOS tubes.

In some embodiments, the conversion circuit includes: a boost circuit, a charging and discharging controller DC/DC, and a dual controller DC/AC.

One end of the boost circuit is connected to the input end of the conversion circuit, and the input end of the conversion circuit is the positive input end and the negative input end of the conversion control module. One end of the charge-discharge controller DC/DC is connected to the energy storage system, and the other end of the charge-discharge controller DC/DC is connected to the other end of the boost circuit. One end of the dual controller DC/AC is connected to the other end of the charging and discharging controller DC/DC, and the other end of the dual controller DC/AC is connected to the DC bus.

In some embodiments of the present disclosure, the boost circuit adopts a circuit as shown in FIG. 4 , including an inductor L1, a switch tube Q1 and a boost diode D1. The positive input end of the conversion control module is connected to one end of the inductor L1, and the switch tube Q1 is connected between the other end of the inductor L1 and the negative input end of the conversion control module. For example, the switching tube Q1 is a triode with a diode connected between the collector and the emitter, wherein the anode of the diode is connected to the emitter of the triode, and the cathode of the diode is connected to the collector. The other end of the inductor L1 is connected to the collector of the triode, the negative input end of the conversion control module is connected to the emitter of the triode, the other end of the inductor L1 is connected to the anode of the boost diode D1, and the cathode of the boost diode D1 is connected to the charge-discharge controller and the bidirectional Positive input of the controller. A capacitor C1 is provided between the charging and discharging controller and the bidirectional controller.

In some embodiments, the circuit shown in FIG. 4 is composed of an energy storage system (with a battery management system (BMS)), a photovoltaic cell, a charge-discharge controller DC/DC, a boost circuit (consisting of an inductor L1, a switch tube Q1 and Composed of boost diode D1), bidirectional controller DC/AC, DC contactor K7/K8, auxiliary power supply, control unit, sampling unit and DC bus. For example, the auxiliary power supply supplies power to the control unit and the sampling unit, the sampling unit samples the voltage on the photovoltaic side, and the control unit outputs control signals S1, S2, S3, S4 and S5, respectively controlling the switching tube Q1, MOS tube Q2, MOS tube Q3, MOS transistor Q4 and MOS transistor Q5 are turned on and off.

The following describes the working process of the circuit shown in FIG. 4 according to some embodiments of the present disclosure.

When the positive and negative terminals of the photovoltaic cell are connected correctly, the sampling unit samples the voltage signal of the photovoltaic cell and sends it to the control unit. When the control unit determines that the photovoltaic cell is connected, it sends out control signals S3 and S4 to enable the first MOS transistor Q3 and the second MOS transistor Q4 to enable the photovoltaic cell to work normally.

When the positive pole and negative pole of the photovoltaic cell are reversely connected, the sampling unit samples the voltage signal of the photovoltaic cell and sends it to the control unit. When the control unit judges that the photovoltaic battery is reversely connected, it sends out control signals S2 and S5 to turn on the fourth MOS transistor Q2 and the third MOS transistor Q5, and the photovoltaic battery is connected to work normally.

Because the newly added auxiliary device in the circuit in Figure 4 is a MOS tube, the current through the MOS tube can flow bidirectionally, which can realize charging and discharging, and a device with a small on-resistance can be selected to reduce its conduction loss.

The photovoltaic energy storage circuit provided by the embodiments of the present disclosure adds auxiliary devices and optimizes the control logic on the basis of the traditional topology, so that the system can maintain normal operation regardless of whether the positive and negative poles are reversed when the photovoltaic battery is connected, without manual intervention. The problem caused by the reverse connection of the positive and negative poles of the photovoltaic cell is solved. Compared with the DC contactor, the cost of the added auxiliary device is low, which can improve the function of the photovoltaic energy storage circuit on the basis of cost reduction.

Some embodiments of the present disclosure provide a method for controlling a photovoltaic energy storage circuit, which is applied to the photovoltaic energy storage circuit provided in the above embodiments, and the method includes the following steps:

Obtain the wiring status of photovoltaic cells, including positive and reverse connections. For example, the acquisition of the connection condition is obtained by measuring the voltage at both ends of the photovoltaic cell by the sampling unit, and the positive and reverse connection conditions of the photovoltaic cell are obtained according to the positive and negative of the voltage. As shown in Figure 5, the voltage of the photovoltaic cell is sampled to determine whether the photovoltaic cell is reversed.

When the photovoltaic cell is positively connected (the judgment result in Fig. 5 is No), the first MOS tube and the second MOS tube are controlled to be turned on, and the third MOS tube and the fourth MOS tube are turned off; when the photovoltaic cell is reversely connected (Fig. 5 If the result of the judgment in is yes), the first MOS transistor and the second MOS transistor are controlled to be turned off, and the third MOS transistor and the fourth MOS transistor are turned on. For example, the control unit controls the conduction of MOS transistors Q2 and Q5 by sending control signals S2 and S5, and controls the conduction of MOS transistors Q3 and Q4 by sending control signals S3 and S4.

The control method provided by the embodiment of the present disclosure can maintain the normal operation of the system regardless of whether the positive and negative poles are reversed when the photovoltaic battery is connected, without manual intervention, and solves the problem caused by the reversed positive and negative poles of the photovoltaic battery.

An embodiment of the present disclosure provides a photovoltaic air-conditioning system, including the photovoltaic energy storage circuit provided in any one of the foregoing embodiments.

The photovoltaic air-conditioning system provided by the embodiments of the present disclosure has a DC input self-calibration function. On the basis of the traditional topology, auxiliary devices are added and the control logic is optimized to realize the normal operation of the system regardless of whether the positive and negative poles are reversed when the photovoltaic battery is connected, without manual intervention, which solves the problems caused by the photovoltaic reverse connection. Compared with the DC contactor, the cost of the added auxiliary device is low, which can improve the function of the photovoltaic air conditioning system on the basis of cost reduction.

An embodiment of the present disclosure provides a photovoltaic air conditioner, including the photovoltaic air conditioner system provided in any one of the foregoing embodiments.

The photovoltaic air conditioner provided by the embodiments of the present disclosure can maintain the normal operation of the system regardless of whether the positive pole and the negative pole are reversed when the photovoltaic battery is connected, without manual intervention, and solves the problem caused by the photovoltaic reverse connection. Compared with the DC contactor, the cost of the added auxiliary device is low, which can improve the function of the photovoltaic energy storage circuit on the basis of cost reduction.

It can be understood that, the same or similar parts in the above embodiments can be referred to each other, and the content that is not described in detail in some embodiments can be referred to the same or similar content in other embodiments.

It should be noted that, in the description of the present disclosure, terms such as "first" and "second" are used for description purposes only, and should not be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" means at least two.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present disclosure pertain.

It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are implemented in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present disclosure, and those skilled in the art can understand the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims

A photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, a first MOS tube, a second MOS tube, and an energy storage system, wherein:

The conversion control module is connected to the energy storage system;

The positive output terminal of the photovoltaic cell is connected to the source of the first MOS transistor, and the drain of the first MOS transistor is connected to the positive input terminal of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the drain of the second MOS transistor, and the source of the second MOS transistor is connected to the negative input terminal of the conversion control module;

Both the gate of the first MOS transistor and the gate of the second MOS transistor are electrically connected to the conversion control module.
The photovoltaic energy storage circuit according to claim 1, further comprising: a third MOS tube and a fourth MOS tube;

The negative output terminal of the photovoltaic cell is connected to the source of the third MOS transistor, and the drain of the third MOS transistor is connected to the positive input terminal of the conversion control module;

The positive output terminal of the photovoltaic cell is connected to the drain of the fourth MOS transistor, and the source of the fourth MOS transistor is connected to the negative input terminal of the conversion control module;

Both the gate of the third MOS transistor and the gate of the fourth MOS transistor are electrically connected to the conversion control module.
A photovoltaic energy storage circuit, including a photovoltaic cell, a conversion control module, a first MOS tube, a second MOS tube, and an energy storage system, wherein:

The conversion control module is connected to the energy storage system;

The positive output end of the photovoltaic cell is connected to the first electrode of the first MOS transistor, and the second electrode of the first MOS transistor is connected to the positive input end of the conversion control module;

The negative output terminal of the photovoltaic cell is connected to the first electrode of the second MOS transistor, and the second electrode of the second MOS transistor is connected to the negative input terminal of the conversion control module;

Both the gate of the first MOS transistor and the gate of the second MOS transistor are electrically connected to the conversion control module.
The photovoltaic energy storage circuit according to claim 3, further comprising: a third MOS tube and a fourth MOS tube;

The negative output terminal of the photovoltaic cell is connected to the first electrode of the third MOS transistor, and the second electrode of the third MOS transistor is connected to the positive input terminal of the conversion control module;

The positive output terminal of the photovoltaic cell is connected to the first electrode of the fourth MOS transistor, and the second electrode of the fourth MOS transistor is connected to the negative input terminal of the conversion control module;

Both the gate of the third MOS transistor and the gate of the fourth MOS transistor are electrically connected to the conversion control module.
The photovoltaic energy storage circuit according to claim 2 or 4, wherein the conversion control module includes a control unit, an auxiliary power supply and a conversion circuit; the grid of the first MOS transistor, the grid of the second MOS transistor, the grid of the second MOS transistor, The gates of the three MOS transistors and the fourth MOS transistor are all connected to the control unit, the conversion circuit is connected to the energy storage system, and the auxiliary power supply is used to take power from the conversion circuit and provide power for all power supply to the control unit.
The photovoltaic energy storage circuit according to claim 5, wherein the conversion control module further comprises:

A sampling unit connected to the control unit, the sampling unit is used to sample whether the photovoltaic cell is reversed, and send the sampling result to the control unit;

The control unit is used for controlling the on-off of the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor according to the sampling result.
The photovoltaic energy storage circuit according to claim 6, wherein the sampling unit is used for sampling the voltage between the positive output terminal and the negative output terminal of the photovoltaic cell.
The photovoltaic energy storage circuit according to claim 6, wherein, when the photovoltaic cell is positively connected, the first MOS transistor and the second MOS transistor are turned on, and the third MOS transistor and the fourth MOS transistor are turned off.
The photovoltaic energy storage circuit according to claim 6, wherein, when the photovoltaic cell is reversely connected, the first MOS transistor and the second MOS transistor are turned off, and the third MOS transistor and the fourth MOS transistor are turned on .
The photovoltaic energy storage circuit according to claim 5, wherein the conversion circuit comprises: a boost circuit, a charge and discharge controller, and a bidirectional controller;

One end of the boost circuit is connected to the input end of the conversion circuit, and the input end of the conversion circuit is the positive input end and the negative input end of the conversion control module;

One end of the charge and discharge controller is connected to the energy storage system, and the other end of the charge and discharge controller is connected to the other end of the conversion circuit;

One end of the bidirectional controller is connected to the other end of the charge and discharge controller, and the other end of the bidirectional controller is connected to a DC bus.
The photovoltaic energy storage circuit according to claim 2 or 4, wherein the conversion control module is used to control the conduction of the first MOS transistor and the second MOS transistor when the photovoltaic cell is positively connected, and the The third MOS tube and the fourth MOS tube are turned off; when the photovoltaic cell is reversely connected, the first MOS tube and the second MOS tube are controlled to be turned off, and the third MOS tube and the fourth MOS tube are turned off. The tube conducts.
A method for controlling a photovoltaic energy storage circuit according to any one of claims 2, 4-11, said method comprising the following steps:

Obtain the wiring situation of the photovoltaic cell, and the wiring situation includes positive connection or reverse connection;

When the photovoltaic cell is positively connected, control the first MOS transistor and the second MOS transistor to be turned on, and the third MOS transistor and the fourth MOS transistor to be turned off;

When the photovoltaic cell is reversely connected, the first MOS transistor and the second MOS transistor are controlled to be turned off, and the third MOS transistor and the fourth MOS transistor are turned on.
A photovoltaic air-conditioning system, comprising the photovoltaic energy storage circuit described in any one of claims 1-11.
A photovoltaic air conditioner, comprising the photovoltaic air conditioner system according to claim 13.