Control method and device for photovoltaic air conditioner, photovoltaic air conditioner

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a control method for a photovoltaic air conditioner. The photovoltaic air conditioner comprises a main control circuit and a driving circuit, wherein the main control circuit comprises a four-way valve coil, the main control circuit is connected with the driving circuit through the four-way valve coil to control the driving circuit to output a PWM signal; the control method comprises the following steps: determining a heating demand of the photovoltaic air conditioner in the case that the photovoltaic air conditioner is off-grid; controlling the main control circuit to electrify the four-way valve coil in the case that the photovoltaic air conditioner has the heating demand; collecting a current value of the four-way valve coil; and adjusting a duty cycle of the PWM signal output by the driving circuit according to the current value of the four-way valve coil. The control method can improve the stability of the four-way valve of the alternating-current specification in the case that the photovoltaic air conditioner is independently off-grid. The application further discloses a control device for the photovoltaic air conditioner and the photovoltaic air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent household appliances, for example to a control method and device for a photovoltaic air conditioner and a photovoltaic air conditioner. BACKGROUND

[0002] Most of the four-way valves currently configured in existing air conditioners are of alternating current specifications, which are cost-effective. The four-way valve needs to be reversed when there is a heating demand for the air conditioner.

[0003] In order to realize the reversing of the four-way valve when there is a heating demand for the air conditioner, the related art controls the reversing of the four-way valve through an alternating current relay, thereby realizing the heating function of the air conditioner.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: If the air conditioner is a photovoltaic air conditioner, the entire machine load needs to use a direct current power supply strategy in the case of independent off-grid operation of the photovoltaic air conditioner, so that the four-way valve of alternating current specification is difficult to work stably in the direct current power supply circuit.

[0005] It should be noted that the information disclosed in the above BACKGROUND section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important components or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0007] The embodiments of the present disclosure provide a control method and device for a photovoltaic air conditioner and a photovoltaic air conditioner, to improve the stability of the operation of the four-way valve of alternating current specification in the case of independent off-grid operation of the photovoltaic air conditioner.

[0008] In some embodiments, the photovoltaic air conditioner includes a main control circuit and a driving circuit, wherein the main control circuit includes a four-way valve coil, and the main control circuit is connected to the driving circuit through the four-way valve coil to control the driving circuit to output a PWM signal; the control method for the photovoltaic air conditioner includes: determining a heating demand of the photovoltaic air conditioner in the case of off-grid operation of the photovoltaic air conditioner; controlling the main control circuit to energize the four-way valve coil in the case of the existence of the heating demand of the photovoltaic air conditioner; collecting a current value of the four-way valve coil; and adjusting a duty cycle of the PWM signal output by the driving circuit according to the current value of the four-way valve coil.

[0009] Optionally, the main control circuit further comprises a MOS tube, a first electrode of the MOS tube being connected with the driving circuit, and a second electrode of the MOS tube being connected with or disconnected from the coil of the four-way valve; the control of the main control circuit to energize the coil of the four-way valve comprises: controlling the second electrode of the MOS tube to be connected with the coil of the four-way valve to energize the coil of the four-way valve.

[0010] Optionally, the adjustment of the duty cycle of the PWM signal output by the driving circuit according to the current value of the coil of the four-way valve comprises: calculating ΔP = |Pref-Idect×Edc| to obtain a power adjustment value; wherein ΔP is the power adjustment value, Pref is a rated reference power, Idect is the current value flowing through the coil of the four-way valve, and Edc is a direct-current voltage value applied to the coil of the four-way valve; determining a target duty cycle of the PWM signal according to the power adjustment value; and adjusting the duty cycle of the PWM signal according to the target duty cycle.

[0011] Optionally, the determination of the target duty cycle of the PWM signal according to the power adjustment value comprises: determining a duty cycle proportional coefficient and a duty cycle integral coefficient corresponding to the power adjustment value; and determining the target duty cycle according to the duty cycle proportional coefficient and the duty cycle integral coefficient.

[0012] Optionally, the determination of the target duty cycle according to the duty cycle proportional coefficient and the duty cycle integral coefficient comprises calculating the target duty cycle in the following manner:

[0013] G=K ps +K is / s

[0014] wherein G is the target duty cycle of the PWM signal, and 0≤G≤1, K ps is the duty cycle proportional coefficient, K is is the duty cycle integral coefficient, and s is a complex variable.

[0015] Optionally, the adjustment of the duty cycle of the PWM signal according to the target duty cycle comprises: determining a heating demand degree of the photovoltaic air conditioner; determining a target adjustment rate of the PWM signal according to the heating demand degree; and adjusting the duty cycle of the PWM signal to the target duty cycle according to the target adjustment rate.

[0016] Optionally, the determination of the heating demand of the photovoltaic air conditioner comprises: obtaining an indoor environment temperature; calculating a temperature difference between a preset temperature and the indoor environment temperature; and determining the heating demand of the photovoltaic air conditioner according to the temperature difference between the preset temperature and the indoor environment temperature.

[0017] In some embodiments, a control device for a photovoltaic air conditioner comprises a processor and a memory storing program instructions, the processor being configured to execute a control method for a photovoltaic air conditioner as described above when running the program instructions.

[0018] In some embodiments, the photovoltaic air conditioner comprises: a photovoltaic air conditioner body; a main control circuit comprising a four-way valve coil; a driving circuit configured to output a PWM signal; wherein the main control circuit is connected with the driving circuit through the four-way valve coil to control the driving circuit to output the PWM signal; and the control device for the photovoltaic air conditioner as described above is installed in the photovoltaic air conditioner body.

[0019] In some embodiments, the main control circuit further comprises: a MOS tube, a first pole of the MOS tube being connected with the driving circuit, and a second pole of the MOS tube being connected with or disconnected from the four-way valve coil.

[0020] The control method, device and photovoltaic air conditioner provided by the embodiments of the present disclosure can achieve the following effects:

[0021] Since the whole machine load needs to adopt a direct current power supply strategy in the off-grid operation of the photovoltaic air conditioner, when there is a heating demand in the photovoltaic air conditioner, the four-way valve coil is powered to realize the reversing of the four-way valve. The duty cycle of the PWM signal is adjusted through the current value of the four-way valve coil to close-loop control the four-way valve, so that the four-way valve coil works in the rated condition, thereby improving the stability of the AC specification four-way valve in the independent off-grid operation of the photovoltaic air conditioner.

[0022] The foregoing general description and the following description are only exemplary and explanatory, and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute a limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute a proportional limitation, and wherein:

[0024] Figure 1 is a circuit structure schematic diagram in the photovoltaic air conditioner provided by the embodiments of the present disclosure;

[0025] Figure 2 is a schematic diagram of a control method for the photovoltaic air conditioner provided by the embodiments of the present disclosure;

[0026] Figure 3 is a schematic diagram of another control method for the photovoltaic air conditioner provided by the embodiments of the present disclosure;

[0027] Figure 4 is a schematic diagram of another control method for the photovoltaic air conditioner provided by the embodiments of the present disclosure;

[0028] Figure 5 is a schematic diagram of a control device for the photovoltaic air conditioner provided by the embodiments of the present disclosure;

[0029] Figure 6 is a schematic view of a photovoltaic air conditioner product provided by an embodiment of the present disclosure.

[0030] Reference signs:

[0031] 1. photovoltaic air conditioner;

[0032] 10. photovoltaic air conditioner body;

[0033] 200. control device for photovoltaic air conditioner;

[0034] 101. main control circuit; 1011. four-way valve coil; 1012. MOS tube;

[0035] 102. driving circuit;

[0036] 103. detection circuit; 1031. sampling resistor; 1032. operational amplifier; 1033. resistor; 1034. capacitor. DETAILED DESCRIPTION

[0037] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0038] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0039] Unless otherwise specified, the term "a plurality of" means two or more.

[0040] The term "and / or" is a description of the association relationship between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0041] The term "corresponding" can refer to an association relationship or a binding relationship. A and B correspond to each other means that A and B have an association relationship or a binding relationship.

[0042] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0043] In the embodiment of the present disclosure, the duty cycle of the PWM signal is adjusted by the current value of the four-way valve coil to control the four-way valve in a closed loop, so that the four-way valve coil works in the rated condition, thereby improving the stability of the four-way valve of the alternating current specification working in the photovoltaic air conditioner independent off-grid operation.

[0044] As shown in Figure 1 A photovoltaic air conditioner 1 is provided in the embodiment of the present disclosure. The photovoltaic air conditioner 1 comprises a main control circuit 101, a driving circuit 102, a detection circuit 103, and an electric control device (not shown in the figure). The main control circuit 101 comprises a four-way valve coil 1011, and the main control circuit 101 is connected with the driving circuit 102 through the four-way valve coil 1011 to control the driving circuit 102 to output a PWM (Pulse Width Modulation) signal. The detection circuit 103 is connected with the four-way valve coil 1011 and is configured to collect the current value flowing through the four-way valve coil 1011 in the case that the four-way valve coil 1011 is powered. The electric control device comprises a processor (not shown in the figure), and the processor is used to control the PWM signal output by the driving circuit 102 and other electric control components, thereby realizing various functions of the photovoltaic air conditioner 1.

[0045] Optionally, the detection circuit 103 comprises a sampling resistor 1031 and an operational amplifier 1032. The sampling resistor 1031 is connected in series with the four-way valve coil 1011. The operational amplifier 1032 is connected in parallel with the sampling resistor 1031. The non-inverting input terminal of the operational amplifier 1032 is connected to one end of the sampling resistor 1031 connected with the four-way valve coil 1011, and the inverting input terminal of the operational amplifier 1032 is connected to the other end of the sampling resistor 1031.

[0046] Optionally, the detection circuit 103 further comprises a resistor 1033 and a capacitor 1034. The resistor 1033 is connected in parallel with the operational amplifier 1032, and one end of the resistor 1033 is connected with the inverting input terminal of the operational amplifier 1032, and the other end of the resistor 1033 is connected with the output terminal of the operational amplifier 1032. The capacitor 1034 is connected in parallel with the operational amplifier 1032 and the resistor 1033, respectively, and one end of the capacitor 1034 is connected with the inverting input terminal of the operational amplifier 1032, and the other end of the capacitor 1034 is connected with the output terminal of the operational amplifier 1032.

[0047] Optionally, the main control circuit 101 further comprises a MOS tube 1012. The first pole of the MOS tube 1012 is connected with the driving circuit 102, and the second pole of the MOS tube 1012 is connected with or disconnected from the four-way valve coil 1011. The connection or disconnection of the second pole of the MOS tube 1012 with the four-way valve coil 1011 is controlled to control the power-on or power-off of the four-way valve coil 1011.

[0048] Optionally, the third pole of the MOS tube 1012 is connected with one end of the DC bus. The detection circuit 103 is connected with the other end of the DC bus. In this way, the power supply of the four-way valve coil 1011 is taken from the DC bus of the photovoltaic air conditioner 1, which can ensure that the photovoltaic air conditioner 1 can also operate when off-grid.

[0049] Optionally, the photovoltaic air conditioner 1 further comprises a PI operator. The PI operator is electrically connected with the processor.

[0050] In combination Figure 1 The photovoltaic air conditioner shown in the embodiment of the present disclosure provides a control method for a photovoltaic air conditioner, as shown in the embodiment of the present disclosure. Figure 2 The control method comprises the following steps.

[0051] S201, in the case of off-grid operation of the photovoltaic air conditioner, the processor determines the heating demand of the photovoltaic air conditioner.

[0052] S202, in the case of heating demand of the photovoltaic air conditioner, the processor controls the main control circuit to make the four-way valve coil powered.

[0053] S203, the detection circuit collects the current value of the four-way valve coil.

[0054] S204, the processor adjusts the duty cycle of the PWM signal output by the driving circuit according to the current value of the four-way valve coil.

[0055] In the above embodiment, since in the case of off-grid operation of the photovoltaic air conditioner, the whole machine load needs to adopt a direct current power supply strategy. Therefore, when the photovoltaic air conditioner has a heating demand, the four-way valve coil is powered to realize the reversing of the four-way valve. The PWM signal duty cycle is adjusted according to the current value of the four-way valve coil to close-loop control the four-way valve, so that the four-way valve coil works under rated conditions, thereby improving the stability of the AC specification four-way valve in the case of independent off-grid operation of the photovoltaic air conditioner.

[0056] Optionally, the processor controlling the main control circuit to make the four-way valve coil powered comprises: the processor controlling the second pole of the MOS tube to be connected with the four-way valve coil to make the four-way valve coil powered. In this way, the MOS tube is used to control the four-way valve coil to be powered or powered off, which has smaller loss and more sensitive response.

[0057] Optionally, the processor adjusting the duty cycle of the PWM signal output by the driving circuit according to the current value of the four-way valve coil comprises: the processor calculating ΔP = |Pref-Idect×Edc| to obtain a power adjustment value. Wherein, ΔP is the power adjustment value, Pref is the rated reference power, Idect is the current value flowing through the four-way valve coil, and Edc is the direct current voltage value applied to the four-way valve coil. The processor determines the target duty cycle of the PWM signal according to the power adjustment value. The processor adjusts the duty cycle of the PWM signal according to the target duty cycle.

[0058] Exemplarily, in some practical applications, Pref is 5W (watt), Idect is 78mA (milliampere), Edc is 70V (volt), and ΔP is about 0.5W obtained by calculation.

[0059] In this embodiment, the current flowing through the four-way valve coil is monitored in real time by collecting the current value of the four-way valve coil. The power adjustment value is calculated through the current value of the four-way valve coil, so as to determine the current adjustment value, and then the output PWM signal of the driving circuit is adjusted in real time, so that the four-way valve coil works under the condition of rated current, and the stability of the four-way valve coil is improved.

[0060] Optionally, the processor determining the target duty cycle of the PWM signal according to the power adjustment value comprises: the processor determining a duty cycle proportional coefficient and a duty cycle integral coefficient corresponding to the power adjustment value. The processor determines the target duty cycle according to the duty cycle proportional coefficient and the duty cycle integral coefficient. The duty cycle proportional coefficient and the duty cycle integral coefficient can be determined through the power adjustment value, so as to accurately adjust the output PWM signal.

[0061] Optionally, the processor determining the target duty cycle according to the duty cycle proportional coefficient and the duty cycle integral coefficient comprises: calculating the target duty cycle in the following manner:

[0062] G=K ps +K is / s

[0063] Wherein, G is the target duty cycle of the PWM signal, and 0≤G≤1, K ps is the duty cycle proportional coefficient, K is is the duty cycle integral coefficient, and s is a complex variable.

[0064] In this embodiment, the PI operator is used to output the value of the target duty cycle of the PWM signal. The power adjustment value is input to the PI operator, and the PI operator performs operation according to the duty cycle proportional coefficient and the duty cycle integral coefficient corresponding to the power adjustment value, so as to output the value of the target duty cycle of the PWM signal accurately. The algorithm is simple and easy to implement, and the target duty cycle of the PWM signal obtained is more accurate, and the calculation time is shortened.

[0065] Optionally, the processor determining the duty cycle proportional coefficient and the duty cycle integral coefficient corresponding to the power adjustment value comprises: in the case of 0≤ΔP≤1.5W, 0≤K ps ≤2 8 , and 0≤K is ≤2 8 .

[0066] Optionally, the processor adjusts the duty cycle of the PWM signal to the target duty cycle comprises: the processor determines a heating demand degree of the photovoltaic air conditioner. The processor determines a target adjustment rate of the PWM signal according to the heating demand degree. The processor adjusts the duty cycle of the PWM signal to the target duty cycle at the target adjustment rate.

[0067] In this embodiment, the duty cycle of the PWM signal is adjusted at the target adjustment rate, so that the current PWM signal is increased or decreased at the target adjustment rate, thereby controlling the current value flowing through the four-way valve coil to tend to be rated, and thus the four-way valve coil works in the rated condition, thereby improving the stability of the four-way valve of the alternating current specification working in the case of independent off-grid operation of the photovoltaic air conditioner.

[0068] Optionally, the processor determining the heating demand degree of the photovoltaic air conditioner comprises: the processor obtaining an indoor environment temperature. The processor calculates a temperature difference between a preset temperature and the indoor environment temperature. The greater the temperature difference between the preset temperature and the indoor environment temperature, the higher the heating demand degree of the photovoltaic air conditioner is determined. The smaller the temperature difference between the preset temperature and the indoor environment temperature, the lower the heating demand degree of the photovoltaic air conditioner is determined.

[0069] Illustratively, in the case of T>8℃, the heating demand degree of the photovoltaic air conditioner is determined to be a first demand degree. In the case of 4℃

[0070] Optionally, the processor determines the target adjustment rate of the PWM signal according to the heating demand degree: the processor determines the target adjustment rate of the PWM signal corresponding to the heating demand degree according to a preset corresponding relationship. The heating demand degree and the target adjustment rate of the PWM signal are positively correlated.

[0071] Exemplarily, determining the target adjustment rate of the PWM signal corresponding to the heating demand degree comprises: in a case where the heating demand degree is a first demand degree, determining the target adjustment rate of the PWM signal corresponding to the heating demand degree as a first adjustment rate; in a case where the heating demand degree is a second demand degree, determining the target adjustment rate of the PWM signal corresponding to the heating demand degree as a second adjustment rate; in a case where the heating demand degree is a third demand degree, determining the target adjustment rate of the PWM signal corresponding to the heating demand degree as a third adjustment rate; and in a case where the heating demand degree is a fourth demand degree, determining the target adjustment rate of the PWM signal corresponding to the heating demand degree as a fourth adjustment rate. The first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the third adjustment rate is greater than the fourth adjustment rate.

[0072] As shown in Figure 3 Another control method for a photovoltaic air conditioner is provided in the embodiments of the present disclosure. The method comprises:

[0073] In S301, the processor obtains the indoor ambient temperature in a case where the photovoltaic air conditioner operates off-grid.

[0074] In S302, the processor calculates the temperature difference between the preset temperature and the indoor ambient temperature.

[0075] The preset temperature is 23-28℃.

[0076] In S303, the processor determines the heating demand of the photovoltaic air conditioner according to the temperature difference between the preset temperature and the indoor ambient temperature.

[0077] In S304, the processor controls the main control circuit to energize the four-way valve coil in a case where the photovoltaic air conditioner has a heating demand.

[0078] In S305, the detection circuit collects the current value of the four-way valve coil.

[0079] In S306, the processor adjusts the duty cycle of the PWM signal output by the driving circuit according to the current value of the four-way valve coil.

[0080] In the above embodiments, the heating demand of the photovoltaic air conditioner is determined according to the preset temperature and the indoor ambient temperature. In a case where the temperature difference between the preset temperature and the indoor ambient temperature reaches a set temperature difference, it is determined that the photovoltaic air conditioner has a heating demand. At this time, the four-way valve of the photovoltaic air conditioner has a reversing demand, and therefore, the driving circuit outputs a PWM control signal to control the MOS tube to act quickly, so that the four-way valve coil is energized to complete system reversing.

[0081] Optionally, the processor determines the heating demand of the photovoltaic air conditioner according to a temperature difference between the preset temperature and the indoor environment temperature, and the method comprises: in a case where the temperature difference between the preset temperature and the indoor environment temperature is greater than 4℃, it is determined that the photovoltaic air conditioner has a heating demand; and in a case where the temperature difference between the preset temperature and the indoor environment temperature is less than or equal to 4℃, it is determined that the photovoltaic air conditioner has no heating demand, and the photovoltaic air conditioner maintains a current state.

[0082] Optionally, the processor determines the heating demand of the photovoltaic air conditioner, and the method comprises: the infrared sensor detects the temperature of a human body in a preset range of the photovoltaic air conditioner; and the processor calculates the temperature of the human body and the indoor environment temperature by using a thermal sensation algorithm to determine the heating demand of the photovoltaic air conditioner.

[0083] As shown in Figure 4 The present disclosure provides another control method for a photovoltaic air conditioner. The method comprises:

[0084] S401, in a case where the photovoltaic air conditioner operates off-grid, a processor obtains an indoor environment temperature.

[0085] S402, the processor calculates a temperature difference between a preset temperature and the indoor environment temperature.

[0086] S403, in a case where the temperature difference between the preset temperature and the indoor environment temperature is greater than 4℃, the processor determines that the photovoltaic air conditioner has a heating demand.

[0087] S404, the processor controls a second electrode of a MOS tube to be connected with a four-way valve coil, so that the four-way valve coil is powered.

[0088] S405, a detection circuit collects a current value Idect of the four-way valve coil.

[0089] S406, the processor calculates ΔP = |Pref-Idect×Edc| to obtain a power adjustment value.

[0090] S407, the processor determines a duty cycle proportional coefficient and a duty cycle integral coefficient corresponding to the power adjustment value.

[0091] S408, the processor determines a target duty cycle according to the duty cycle proportional coefficient and the duty cycle integral coefficient.

[0092] S409, the processor adjusts a duty cycle of a PWM signal according to the target duty cycle.

[0093] In this embodiment, the control method implementation process is exemplarily described. Since in the case of independent off-grid operation of the photovoltaic air conditioner, the whole machine load needs to adopt direct current power supply strategy, thus, the four-way valve of alternating current specification is difficult to work stably in the direct current power supply circuit in the case of commutation. Therefore, the control method connects the second electrode of the MOS tube with the four-way valve coil, so that the driving signal outputs the PWM signal to the four-way valve coil, and controls the four-way valve coil to be powered. In the case of power supply of the four-way valve, since the four-way valve coil is of alternating current specification, the coil will be burned out. Therefore, the detection circuit is arranged to collect the current value flowing through the four-way valve in real time, compares the power calculated by the current value with the rated power to obtain the power adjustment value, so as to obtain the target duty cycle of the PWM signal. The processor controls the driving circuit to output the PWM signal of the target duty cycle, so that the four-way valve coil works under the condition of rated current, and the working stability of the four-way valve of alternating current specification in the direct current circuit is improved.

[0094] In combination Figure 5 , the embodiment of the present disclosure provides a control device 200 for a photovoltaic air conditioner, comprising a processor 500 and a memory 501. Optionally, the control device for the photovoltaic air conditioner can also comprise a communication interface 502 and a bus 503. Wherein the processor 500, the communication interface 502 and the memory 501 can complete the communication among each other through the bus 503. The communication interface 502 can be used for information transmission. The processor 500 can call the logical instructions in the memory 501 to execute the control method for the photovoltaic air conditioner of the above-mentioned embodiment.

[0095] In addition, the logical instructions in the memory 501 described above can be realized in the form of a software function unit and sold or used as an independent product when used, which can be stored in a computer readable storage medium.

[0096] The memory 501 as a storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 500 executes the program instructions / modules stored in the memory 501, thereby performing function application and data processing, that is, realizing the control method for the photovoltaic air conditioner in the above-mentioned embodiment.

[0097] The memory 501 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required by a function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 501 can include a high-speed random access memory, and can also include a non-volatile memory.

[0098] In combination Figure 6As shown, the embodiment of the present disclosure provides a photovoltaic air conditioner 1. The photovoltaic air conditioner 1 comprises a photovoltaic air conditioner body 10, a main control circuit, a driving circuit, and the control device 200 for the photovoltaic air conditioner described above. The control device 200 for the photovoltaic air conditioner is installed in the photovoltaic air conditioner body 10. The installation relationship described herein is not limited to being placed inside the photovoltaic air conditioner, but also includes installation connection with other components of the photovoltaic air conditioner, including but not limited to physical connection, electrical connection, or signal transmission connection, etc. Those skilled in the art can understand that the control device 200 for the photovoltaic air conditioner can be adapted to the feasible photovoltaic air conditioner body 10, thereby realizing other feasible embodiments. The main control circuit is arranged in the photovoltaic air conditioner body 10 and comprises a four-way valve coil. The driving circuit is arranged in the photovoltaic air conditioner body 10 and is configured to output a PWM signal. The main control circuit is connected to the driving circuit through the four-way valve coil to control the driving circuit to output the PWM signal.

[0099] Optionally, the main control circuit further comprises a MOS tube. The first pole of the MOS tube is connected to the driving circuit, and the second pole of the MOS tube is connected to or disconnected from the four-way valve coil.

[0100] The embodiment of the present disclosure provides a computer readable storage medium, which stores computer executable instructions configured to execute the control method for the photovoltaic air conditioner described above.

[0101] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0102] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiment of the present disclosure. The storage medium described above can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. various media that can store program codes, or a transitory storage medium.

[0103] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0104] 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 the embodiments of this disclosure. 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.

[0105] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.), can be implemented in other manners. For example, the described apparatus embodiments can be implemented only in a form of a logical function, and can be implemented by using a manner such as software (for example, application program) or the like. In some embodiments, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or indirect coupling between different units, or the coupling or direct coupling or indirect coupling between the displayed or discussed communication connections can be in a form of electrical, mechanical or other forms.

[0106] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions and operations of the system, method and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks can occur in an order different from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in an order different from that disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for photovoltaic air conditioning, characterized in that, The photovoltaic air conditioner includes a main control circuit and a drive circuit. The main control circuit includes a four-way valve coil, which is connected to the drive circuit to control the drive circuit to output a PWM signal. The control method includes: Determine the heating demand of photovoltaic air conditioners when they are operating off-grid. When a photovoltaic air conditioner has a heating requirement, the main control circuit is controlled to energize the four-way valve coil. Collect the current value of the four-way valve coil; The duty cycle of the PWM signal output by the drive circuit is adjusted according to the current value of the four-way valve coil. The duty cycle of the PWM signal output by the drive circuit is adjusted according to the current value of the four-way valve coil, including: Calculate ΔP = |Pref - Idect × Edc| to obtain the power adjustment value; where ΔP is the power adjustment value, Pref is the rated reference power, Idect is the current flowing through the four-way valve coil, and Edc is the DC voltage applied to the four-way valve coil. The target duty cycle of the PWM signal is determined based on the power adjustment value; Adjust the duty cycle of the PWM signal according to the target duty cycle.

2. The control method according to claim 1, characterized in that, The main control circuit also includes a MOSFET, the first terminal of which is connected to the drive circuit, and the second terminal of which is connected to or disconnected from the four-way valve coil; controlling the main control circuit to energize the four-way valve coil includes: The second terminal of the control MOSFET is connected to the four-way valve coil to energize the four-way valve coil.

3. The control method according to claim 1, characterized in that, The target duty cycle of the PWM signal is determined based on the power adjustment value, including: Determine the duty cycle proportional coefficient and duty cycle integral coefficient corresponding to the power adjustment value; The target duty cycle is determined based on the duty cycle proportional coefficient and the duty cycle integral coefficient.

4. The control method according to claim 3, characterized in that, The target duty cycle is determined based on the duty cycle scaling factor and the duty cycle integral factor, including calculating the target duty cycle as follows: G=K ps +K is / s Where G is the target duty cycle of the PWM signal, and 0 ≤ G ≤ 1, K ps K is the duty cycle proportionality factor. is is the duty cycle integral coefficient, and s is a complex variable.

5. The control method according to claim 1, characterized in that, Adjusting the duty cycle of the PWM signal according to the target duty cycle includes: Determine the heating demand of photovoltaic air conditioners; The target adjustment rate of the PWM signal is determined based on the degree of heating demand. Adjust the duty cycle of the PWM signal to the target duty cycle according to the target adjustment rate.

6. The control method according to any one of claims 1 to 5, characterized in that, Determine the heating requirements of the photovoltaic air conditioner, including: Obtain the indoor ambient temperature; Calculate the temperature difference between the preset temperature and the indoor ambient temperature; The heating requirements of the photovoltaic air conditioner are determined based on the temperature difference between the preset temperature and the indoor ambient temperature.

7. A control device for a photovoltaic air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the control method for photovoltaic air conditioning as described in any one of claims 1 to 6 when running program instructions.

8. A photovoltaic air conditioner, characterized in that, include: Photovoltaic air conditioner body; The main control circuit is located in the photovoltaic air conditioner body and includes a four-way valve coil; The drive circuit, located within the photovoltaic air conditioner body, is configured to output a PWM signal; wherein, the main control circuit is connected to the drive circuit via a four-way valve coil to control the drive circuit to output the PWM signal; and, The control device for photovoltaic air conditioning as described in claim 7 is installed on the photovoltaic air conditioning unit.

9. The photovoltaic air conditioner according to claim 8, characterized in that, The main control circuit also includes: The first terminal of the MOSFET is connected to the drive circuit, and the second terminal of the MOSFET is connected to or disconnected from the four-way valve coil.

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