Photovoltaic air conditioner control device, parameter configuration method thereof and photovoltaic air conditioner

Abstract

The invention relates to a photovoltaic air conditioner control device, a parameter configuration method of the photovoltaic air conditioner control device and a photovoltaic air conditioner. After a controller determines a required conditioning coefficient and a protection threshold range according to the power level of a photovoltaic frequency converter connected to the photovoltaic air conditioner, the conditioning coefficient is configured to an adjustable sampling conditioning circuit; the adjustable sampling conditioning circuit is enabled to operate at the conditioning coefficient, and the protection threshold range is configured to the adjustable hardware protection circuit, so that the adjustable hardware protection circuit is enabled to operate at the protection threshold range. According to the scheme, the conditioning coefficient and the protection threshold range of the photovoltaic air conditioner control device can be adjusted according to the power level of the actually-connected photovoltaic frequency converter, and therefore the photovoltaic air conditioner control device is matched with the photovoltaic frequency converter. Therefore, one photovoltaic air conditioner control device is compatible with a plurality of photovoltaic frequency converters with different power levels, the applicability of the photovoltaic air conditioner control device is greatly improved, and the maintenance work of the photovoltaic air conditioner control device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic air conditioning, and in particular to a photovoltaic air conditioning control device and a parameter configuration method thereof, and a photovoltaic air conditioning. Background Art

[0002] With the rapid development of science and technology, photovoltaic air conditioners that convert solar energy into electrical energy to drive components such as variable frequency compressors have gradually been developed and applied.

[0003] Because different photovoltaic inverters require different sampling ranges and hardware protection parameters, different power levels often require different control motherboards. As power levels increase, the number of control motherboard models also increases. Consequently, photovoltaic air conditioners suffer from poor control motherboard versatility. Summary of the Invention

[0004] Based on this, it is necessary to address the problem of poor versatility of the control mainboard in photovoltaic air conditioners and propose a photovoltaic air conditioner control device and its parameter configuration method, as well as a photovoltaic air conditioner. One photovoltaic air conditioner control device can be compatible with multiple photovoltaic inverters of different power levels, and has high versatility.

[0005] A photovoltaic air conditioner control device comprises: an adjustable sampling and conditioning circuit, an adjustable hardware protection circuit and a controller, wherein the controller is connected to the adjustable sampling and conditioning circuit and the adjustable hardware protection circuit. The controller is used to determine the conditioning coefficient required by the adjustable sampling and conditioning circuit and the protection threshold range required by the adjustable hardware protection circuit according to the power level of the photovoltaic inverter of the photovoltaic air conditioner, and to control the adjustable sampling and conditioning circuit to operate with the conditioning coefficient and to control the adjustable hardware protection circuit to operate within the protection threshold range.

[0006] The aforementioned photovoltaic air conditioning control device is equipped with an adjustable sampling conditioning circuit with an adjustable conditioning coefficient and an adjustable hardware protection circuit with an adjustable protection threshold range. In actual scenarios, the controller determines the required conditioning coefficient and protection threshold range based on the power level of the photovoltaic inverter connected to the photovoltaic air conditioner. It then assigns the conditioning coefficient to the adjustable sampling conditioning circuit, causing the adjustable sampling conditioning circuit to operate at the conditioning coefficient, and assigns the protection threshold range to the adjustable hardware protection circuit, causing the adjustable hardware protection circuit to operate within the protection threshold range. With this solution, the conditioning coefficient and protection threshold range of the photovoltaic air conditioning control device can be adjusted based on the actual power level of the connected photovoltaic inverter, thereby adapting to the photovoltaic inverter. In this way, a single photovoltaic air conditioning control device is compatible with multiple photovoltaic inverters of different power levels, greatly improving the applicability of the photovoltaic air conditioning control device and reducing maintenance work for the photovoltaic air conditioning control device.

[0007] In one embodiment, the adjustable sampling conditioning circuit includes an operational amplifier, a feedback circuit and a first adjustable resistor array circuit; the positive input terminal of the operational amplifier is connected to the first adjustable resistor array circuit, the first adjustable resistor array circuit is used to input the collected electrical parameters, the feedback circuit is connected to the reverse input terminal of the operational amplifier and the output terminal of the operational amplifier, and the output terminal of the operational amplifier and the first adjustable resistor array circuit are respectively connected to the controller.

[0008] The above scheme uses an operational amplifier, a feedback circuit, and a first adjustable resistor array circuit to form an adjustable sampling and conditioning circuit. By changing the bias resistance value of the positive input terminal of the operational amplifier, the gain of the operational amplifier is changed, that is, the conditioning coefficient of the adjustable sampling and conditioning circuit is changed, and the scheme has high reliability in conditioning coefficient adjustment.

[0009] In one embodiment, the first adjustable resistor array circuit includes a first resistor, a second resistor and multiple first resistor branches, the first resistor branch includes a first controllable switch and a first channel resistor connected in series, the first end of the first resistor is used to input the collected electrical parameters, the second end of the first resistor is connected to the first end of the second resistor and the positive input end of the operational amplifier, the first end of each first resistor branch is respectively connected to the second end of the second resistor, the second end of each first resistor branch is respectively grounded, and the first controllable switch is connected to the controller.

[0010] The above scheme uses a first resistor, a second resistor and multiple first resistor branches to form a first adjustable resistor array circuit, and controls the number of connected first resistor branches to achieve resistance adjustment of the first adjustable resistor array circuit, which has high resistance adjustment convenience and accuracy.

[0011] In one embodiment, the feedback circuit includes a third resistor and a fourth resistor, the first end of the third resistor is grounded, the second end of the third resistor is connected to the first end of the fourth resistor and the inverting input end of the operational amplifier, and the second end of the fourth resistor is connected to the output end of the operational amplifier.

[0012] The above solution uses the third resistor and the fourth resistor to form a feedback circuit, which has the advantages of simple circuit structure and saving device costs.

[0013] Or, in one embodiment, the feedback circuit includes a third resistor, a fourth resistor and a filter capacitor, the first end of the third resistor is grounded, the second end of the third resistor is connected to the first end of the fourth resistor and the inverting input end of the operational amplifier, the second end of the fourth resistor is connected to the output end of the operational amplifier, the first end of the filter capacitor is connected to the first end of the fourth resistor, and the second end of the filter capacitor is connected to the second end of the fourth resistor.

[0014] The above solution uses the third resistor, the fourth resistor and the filter capacitor to form a feedback circuit to achieve filter feedback operation, which has high operation stability and reliability.

[0015] In one embodiment, the adjustable hardware protection circuit includes a first comparator, a second comparator, a second adjustable resistor array circuit and a third adjustable resistor array circuit; the positive input end of the first comparator and the reverse input end of the second comparator are respectively used to input the collected electrical parameters, the reverse input end of the first comparator is connected to the first power supply through the second adjustable resistor array circuit, the positive input end of the second comparator is connected to the second power supply through the third adjustable resistor array circuit, and the output end of the first comparator, the output end of the second comparator, the second adjustable resistor array circuit and the third adjustable resistor array circuit are respectively connected to the controller.

[0016] The above scheme uses two groups of comparators and adjustable resistor array circuits to build an adjustable hardware protection circuit, which can realize the circuit protection function in both the positive and negative half cycles of the collected electrical parameters, effectively improving the operating reliability of the adjustable hardware protection circuit.

[0017] In one embodiment, the second adjustable resistor array circuit includes a fifth resistor, a sixth resistor and multiple second resistor branches, the second resistor branch includes a second controllable switch and a second channel resistor connected in series, the second controllable switch is connected to the controller, the inverting input end of the first comparator is connected to the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is connected to the first power supply, the first end of the second resistor branch is respectively connected to the second end of the sixth resistor, and the second ends of the second resistor branch are respectively grounded.

[0018] The above scheme uses the fifth resistor, the sixth resistor and multiple second resistor branches to form a second adjustable resistor array circuit. By changing the number of connected second resistor branches, the resistance adjustment of the second adjustable resistor array circuit is achieved, which has high resistance adjustment convenience and accuracy.

[0019] And / or, in one embodiment, the third adjustable resistor array circuit includes a seventh resistor, an eighth resistor and multiple third resistor branches, the third resistor branch includes a third controllable switch and a third channel resistor connected in series, the third controllable switch is connected to the controller, the positive input end of the second comparator is connected to the first end of the seventh resistor and the first end of the eighth resistor, the second end of the seventh resistor is connected to a second power supply, the first ends of the third resistor branches are respectively connected to the second ends of the eighth resistors, and the second ends of the third resistor branches are respectively grounded.

[0020] The above scheme uses the seventh resistor, the eighth resistor and multiple third resistor branches to form a third adjustable resistor array circuit. By changing the number of connected third resistor branches, the resistance adjustment of the third adjustable resistor array circuit is achieved, which has high resistance adjustment convenience and accuracy.

[0021] In one embodiment, the adjustable sampling and conditioning circuit includes an adjustable current sampling circuit and an adjustable voltage sampling circuit; and / or the adjustable hardware protection circuit includes an adjustable overcurrent protection circuit and an adjustable overvoltage protection circuit.

[0022] The above scheme can realize the conditioning sampling of voltage and current parameters, as well as overvoltage and overcurrent protection, effectively improving the operational reliability of photovoltaic air-conditioning control devices.

[0023] A parameter configuration method based on the above-mentioned photovoltaic air conditioning control device includes: determining the power level of the photovoltaic inverter of the photovoltaic air conditioner; determining the conditioning coefficient required by the adjustable sampling conditioning circuit and the protection threshold range required by the adjustable hardware protection circuit based on the power level; controlling the adjustable sampling conditioning circuit to operate with the conditioning coefficient, and controlling the adjustable hardware protection circuit to operate within the protection threshold range.

[0024] With this parameter configuration method, the PV AC control unit's conditioning coefficient and protection threshold range can be adjusted based on the power level of the connected PV inverter, thereby adapting to the PV inverter. This allows a single PV AC control unit to be compatible with multiple PV inverters of varying power levels, significantly improving its applicability and reducing maintenance.

[0025] In one embodiment, determining the power level of the photovoltaic inverter of the photovoltaic air conditioner includes: obtaining a bus capacitance value of the photovoltaic inverter of the photovoltaic air conditioner; and determining the power level of the photovoltaic inverter according to the bus capacitance value.

[0026] The above solution combines the busbar capacitance value of the photovoltaic inverter to determine the power level of the photovoltaic inverter and ensure the accuracy of the power level.

[0027] In one embodiment, obtaining the bus capacitance value of the photovoltaic inverter of the photovoltaic air conditioner includes: when the photovoltaic inverter of the photovoltaic air conditioner is powered on and running, obtaining the charging time for the bus capacitance of the photovoltaic inverter to be charged to a preset voltage threshold; and determining the bus capacitance value of the photovoltaic inverter based on the charging time.

[0028] The above solution calculates the bus capacitance value by collecting the charging time of the bus capacitance of the photovoltaic inverter to a preset voltage threshold, thereby ensuring the accuracy of the bus capacitance value.

[0029] In one embodiment, determining the power level of the photovoltaic inverter based on the bus capacitance value includes: performing a matching analysis based on the bus capacitance value and a correspondence between a preset capacitance value and a power level to determine the power level of the photovoltaic inverter.

[0030] The above solution determines the power level by matching the bus capacitance value with the corresponding relationship between the preset capacitance value and the power level, which has a high power level determination efficiency.

[0031] In one embodiment, determining the conditioning coefficient required for the adjustable sampling conditioning circuit and the protection threshold range required for the adjustable hardware protection circuit based on the power level includes: determining the rated electrical parameters of the photovoltaic inverter by calculation based on the power level; and determining the conditioning coefficient required for the adjustable sampling conditioning circuit and the protection threshold range required for the adjustable hardware protection circuit by analysis and calculation based on the rated electrical parameters.

[0032] The above scheme first determines the rated electrical parameters in combination with the power level calculation, and then uses the rated electrical parameters to determine the required conditioning coefficient and protection threshold range to ensure the accuracy of the conditioning coefficient and protection threshold range.

[0033] A photovoltaic air conditioner comprises a photovoltaic inverter and the photovoltaic air conditioner control device, wherein the photovoltaic inverter is connected to the photovoltaic air conditioner control device, and the controller is used to execute the steps of the parameter configuration method. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 This is a schematic structural diagram of a photovoltaic air conditioning control device in one embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of the photovoltaic inverter structure in one embodiment of the present application;

[0037] Figure 3 This is a schematic diagram of the structure of an adjustable sampling and conditioning circuit in one embodiment of the present application;

[0038] Figure 4 This is a schematic diagram of the structure of an adjustable sampling and conditioning circuit in another embodiment of the present application;

[0039] Figure 5 This is a schematic diagram of the structure of an adjustable hardware protection circuit in one embodiment of the present application;

[0040] Figure 6 This is a schematic diagram of the structure of an adjustable hardware protection circuit in another embodiment of the present application;

[0041] Figure 7 This is a flow chart of a parameter configuration method in one embodiment of the present application;

[0042] Figure 8 This is a flow chart of a parameter configuration method in another embodiment of the present application;

[0043] Figure 9 This is a flow chart of a parameter configuration method in another embodiment of the present application;

[0044] Figure 10 This is a flow chart of a parameter configuration method in another embodiment of the present application;

[0045] Figure 11 This is a flow chart of a parameter configuration method in another embodiment of the present application.

[0046] Description of reference numerals:

[0047] 10-adjustable sampling and conditioning circuit, 20-adjustable hardware protection circuit, 30-controller; K1-precharge switch, K2-controllable switch, C-bus capacitor, 11-feedback circuit, 12-first adjustable resistor array circuit, Q-operational amplifier; R1-first resistor, R2-second resistor, 121-first resistor branch, R3-third resistor, R4-fourth resistor, C1-filter capacitor; 21-second adjustable resistor array circuit, 22-third adjustable resistor array circuit, P1-first comparator, P2-second comparator; R5-fifth resistor, R6-sixth resistor, 211-second resistor branch, R7-seventh resistor, R8-eighth resistor, 221-third resistor branch. DETAILED DESCRIPTION

[0048] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0050] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0051] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0052] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0053] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0054] The photovoltaic air conditioning control device provided in this application is used in photovoltaic air conditioners to implement functions such as energy management, operation control, and safety protection of photovoltaic air conditioners. It uses high-resolution AD (Analog to Digital Conversion) sampling to accurately collect the output voltage and current of the photovoltaic panel, as well as the operation status data of the photovoltaic air conditioner, providing a reliable basis for intelligent control. In the photovoltaic air conditioning control device of this application, the sampling-related conditioning coefficient and the protection threshold range related to hardware protection can be adjusted in combination with the power level of the actually connected photovoltaic inverter, so that a photovoltaic air conditioning control device can be adapted to multiple photovoltaic inverters of different power levels.

[0055] See also Figure 1 The present application provides a photovoltaic air conditioner control device, including: an adjustable sampling and conditioning circuit 10, an adjustable hardware protection circuit 20 and a controller 30. The controller 30 is connected to the adjustable sampling and conditioning circuit 10 and the adjustable hardware protection circuit 20. The controller 30 is used to determine the conditioning coefficient required by the adjustable sampling and conditioning circuit 10 and the protection threshold range required by the adjustable hardware protection circuit 20 according to the power level of the photovoltaic inverter of the photovoltaic air conditioner, and control the adjustable sampling and conditioning circuit 10 to operate with the conditioning coefficient and control the adjustable hardware protection circuit 20 to operate within the protection threshold range.

[0056] Specifically, the sampling conditioning circuit, i.e., the conditioning coefficient, can be adjusted according to actual needs, thereby conditioning the collected electrical parameters of the photovoltaic air conditioner with the adjusted conditioning coefficient. The adjustable hardware protection circuit 20, i.e., the protection threshold range, can be adjusted according to actual needs, thereby performing the hardware protection function with the adjusted protection threshold range. The conditioning referred to in this application can be amplifying the sampled electrical parameters. When the conditioning coefficient and the protection threshold range are determined, the adjustable sampling conditioning circuit 10 can amplify the collected electrical parameters (depending on the actual situation, the amplification factor can be greater than 1 or less than 1), and then transmit it to the controller 30 for analysis and processing; if the collected electrical parameters of the photovoltaic air conditioner are not within the protection threshold range, the adjustable hardware protection circuit 20 will output a protection signal to the controller 30, thereby executing the protection function.

[0057] The controller 30 is not limited to a single type. In one embodiment, it may be a DSP (Digital Signal Processing). In another embodiment, the controller 30 may be an MCU (Microcontroller Unit). The specific embodiment is not limited thereto. For ease of understanding, the controller 30 is understood to be a DSP in the following embodiments.

[0058] A photovoltaic inverter is a device that converts the DC power output by photovoltaic panels into AC power suitable for components like variable-frequency compressors. The inverter can be connected directly to the photovoltaic panels, receiving the DC power generated by the photovoltaic effect, or indirectly, converting the DC power output by the panels into AC power. The specific connection is not limited.

[0059] For example, in one embodiment, reference may be made to Figure 2 The photovoltaic inverter includes a rectifier unit, an inverter unit and a bus capacitor (Figure C). The AC input end of the rectifier unit is indirectly connected to the photovoltaic panel through a charging circuit. The bus capacitor is connected between the rectifier unit and the inverter unit. The inverter unit is connected to AC loads such as variable frequency compressors. In this way, the output of the photovoltaic panel can be transmitted to the AC load of the photovoltaic air conditioner after a series of changes.

[0060] The structure of the charging circuit is not unique. In one embodiment, each phase input end of the rectifier unit is connected to the photovoltaic panel through a charging circuit. The charging circuit may include only one normal charging branch, or may include a pre-charging branch and a normal charging branch in parallel, without specific limitation. Among them, the pre-charging branch includes a pre-charging switch (K1) and a pre-charging resistor (R) connected in series, and the normal charging branch includes a controllable switch (K2), and both the controllable switch and the pre-charging switch are connected to the controller 30. Under the control of the controller 30, charging can be performed first with the pre-charging branch, and then charging can be performed with the normal charging branch after stabilization.

[0061] The power level of the photovoltaic inverter is also the level of the rated output power of the photovoltaic inverter. The level mentioned here can be a power range or a specific power value, and is not specifically limited. In actual scenarios, the controller 30 can determine the required conditioning coefficient and protection threshold range at the power level based on the power level of the photovoltaic inverter. After that, the operating state of the adjustable sampling conditioning circuit 10 is adjusted in combination with the conditioning coefficient, and finally the adjustable sampling conditioning circuit 10 operates with the determined conditioning coefficient. The controller 30 can also adjust the operating state of the adjustable hardware protection circuit 20 in combination with the protection threshold range, and finally the adjustable hardware protection circuit 20 operates with the determined protection threshold range. In this way, the configuration of the conditioning coefficient and the protection threshold range can be achieved by adjusting the operating state of the adjustable sampling conditioning circuit 10 and the adjustable hardware protection circuit 20, that is, the mainboard parameter configuration is achieved.

[0062] It can be understood that in one embodiment, the photovoltaic air-conditioning control device also includes a substrate (such as a printed circuit board, etc.), and the adjustable sampling and conditioning circuit 10, the adjustable hardware protection circuit 20 and the controller 30 are respectively arranged on the substrate, and the connecting lines between the various circuits are routed through the substrate to form a control mainboard of the photovoltaic air-conditioning.

[0063] The photovoltaic air conditioning control device described above is equipped with an adjustable sampling conditioning circuit 10 with an adjustable conditioning coefficient and an adjustable hardware protection circuit 20 with an adjustable protection threshold range. In actual scenarios, the controller 30 determines the required conditioning coefficient and protection threshold range based on the power level of the photovoltaic inverter connected to the photovoltaic air conditioner. It then assigns the conditioning coefficient to the adjustable sampling conditioning circuit 10, causing the adjustable sampling conditioning circuit 10 to operate at the conditioning coefficient, and assigns the protection threshold range to the adjustable hardware protection circuit 20, causing the adjustable hardware protection circuit 20 to operate within the protection threshold range. With this solution, the conditioning coefficient and protection threshold range of the photovoltaic air conditioning control device can be adjusted based on the actual power level of the connected photovoltaic inverter, thereby adapting to the photovoltaic inverter. In this way, a single photovoltaic air conditioning control device is compatible with multiple photovoltaic inverters of different power levels, greatly improving the applicability of the photovoltaic air conditioning control device and reducing maintenance work for the photovoltaic air conditioning control device.

[0064] See also Figure 3 In one embodiment, the adjustable sampling and conditioning circuit 10 includes an operational amplifier Q, a feedback circuit 11, and a first adjustable resistor array circuit 12; the positive input terminal of the operational amplifier Q is connected to the first adjustable resistor array circuit 12, and the first adjustable resistor array circuit 12 is used to input the collected electrical parameters (not shown in the figure); the feedback circuit 11 is connected to the negative input terminal of the operational amplifier Q and the output terminal of the operational amplifier Q; the output terminal of the operational amplifier Q and the first adjustable resistor array circuit 12 are respectively connected to a controller 30 (not shown in the figure).

[0065] Specifically, in this embodiment, the adjustable sampling and conditioning circuit 10 is used to amplify the sampled electrical parameters, and accordingly, the conditioning coefficient is the amplification factor or gain of the adjustable sampling and conditioning circuit 10. The operational amplifier Q is a device that can amplify the input signal. The feedback circuit 11 is a circuit that feeds back the output of the operational amplifier Q to the inverting input terminal of the operational amplifier Q to improve the operating stability of the operational amplifier Q. The first adjustable resistor array circuit 12 is a circuit whose resistance value can be adjusted under the action of the controller 30. In actual scenarios, by adjusting the resistance value of the first adjustable resistor array circuit 12, the bias parameters of the positive input terminal of the operational amplifier Q can be changed, thereby changing the amplification factor of the operational amplifier Q, that is, changing the conditioning coefficient.

[0066] The above scheme uses the operational amplifier Q, the feedback circuit 11, and the first adjustable resistor array circuit 12 to form an adjustable sampling and conditioning circuit 10. By changing the bias resistance of the positive input terminal of the operational amplifier Q, the gain of the operational amplifier Q is changed, that is, the conditioning coefficient of the adjustable sampling and conditioning circuit 10 is changed, and the reliability of the conditioning coefficient adjustment is relatively high.

[0067] The specific structure of the first adjustable resistor array circuit 12 is not limited to any specific circuit as long as it can change the resistance value under the control of the controller 30 so that the adjustable sampling conditioning circuit 10 operates at the required conditioning coefficient.

[0068] See also Figure 4 In one embodiment, the first adjustable resistor array circuit 12 includes a first resistor R1, a second resistor R2, and multiple first resistor branches 121. The first resistor branch 121 includes a first controllable switch and a first channel resistor connected in series. The first end of the first resistor R1 is used to input the collected electrical parameter. The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the positive input terminal of the operational amplifier Q. The first end of each first resistor branch 121 is respectively connected to the second end of the second resistor R2, and the second end of each first resistor branch 121 is respectively grounded. The first controllable switch is connected to the controller 30 (not shown).

[0069] Specifically, the solution of this embodiment changes the resistance value of the first adjustable resistor array circuit 12 by adjusting the number of connections of the first resistor branch 121. In actual scenarios, the controller 30 only needs to control the controllable switch in the first resistor branch 121 to be turned on to connect the first resistor branch 121 for operation.

[0070] It is understood that the number of first resistance branches 121 configured in the first adjustable resistor array circuit 12 is not unique. Two or more first resistance branches 121 can be provided according to actual needs. Depending on the number of first resistance branches 121, the number of resistance values ​​that can be achieved by the first adjustable resistor array circuit 12 is also different, which should satisfy S=2 n , where n represents the number of first resistance branches 121, S represents the number of achievable resistance values, and each resistance value corresponds to one adjustment coefficient. For example, when there are three first resistance branches 121, namely the first, second, and third branches, the first and second branches can be disconnected, the second branch can be connected, the third branch can be connected, the first and second branches can be connected, the second and third branches can be connected, the first and third branches can be connected, or all three branches can be connected. Thus, a total of eight different resistance values ​​can be achieved by the first adjustable resistor array circuit 12.

[0071] The above scheme uses the first resistor R1, the second resistor R2 and multiple first resistor branches 121 to build a first adjustable resistor array circuit 12, and controls the number of connected first resistor branches 121 to achieve resistance adjustment of the first adjustable resistor array circuit 12, which has high resistance adjustment convenience and accuracy.

[0072] It is understood that in other embodiments, the first adjustable resistor array circuit 12 may also adopt other structures, for example, including only the first resistor branch 121 in the above embodiment, and in actual scenarios, it is sufficient to control at least one first resistor branch 121 to be conductive. In other embodiments, the first adjustable resistor array circuit 12 also includes multiple resistors connected in series, with a bypass switch connected in parallel at both ends of each resistor. In this case, the number of resistors in series can be adjusted by controlling the conduction and deactivation of the bypass switch, thereby changing the resistance value.

[0073] Please continue reading Figure 4 In one embodiment, the feedback circuit 11 includes a third resistor R3 and a fourth resistor R4, a first end of the third resistor R3 is grounded, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4 and an inverting input end of the operational amplifier Q, and a second end of the fourth resistor R4 is connected to an output end of the operational amplifier Q.

[0074] Specifically, in the solution of this embodiment, two resistors are used to implement the negative feedback function of the operational amplifier Q. The above solution, using the third resistor R3 and the fourth resistor R4 to form the feedback circuit 11, has the advantages of simple circuit structure and reduced device cost.

[0075] Please continue reading Figure 4 In one embodiment, the feedback circuit 11 includes a third resistor R3, a fourth resistor R4, and a filter capacitor C1. A first end of the third resistor R3 is grounded, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4 and an inverting input end of the operational amplifier Q, a second end of the fourth resistor R4 is connected to an output end of the operational amplifier Q, a first end of the filter capacitor C1 is connected to a first end of the fourth resistor R4, and a second end of the filter capacitor C1 is connected to a second end of the fourth resistor R4.

[0076] Specifically, in the solution of this embodiment, a filter capacitor C1 is further connected in parallel at both ends of the fourth resistor R4. Through the setting of the filter capacitor C1, on the basis of realizing the original negative feedback function, it can also form an RC filter together with the fourth resistor R4 to filter out high-frequency noise or unnecessary high-frequency components in the input signal, reduce high-frequency gain, and improve stability.

[0077] In the above solution, the third resistor R3, the fourth resistor R4 and the filter capacitor C1 are used to construct the feedback circuit 11 to implement filter feedback operation, which has high operation stability and reliability.

[0078] See also Figure 5In one embodiment, the adjustable hardware protection circuit 20 includes a first comparator P1, a second comparator P2, a second adjustable resistor array circuit 21, and a third adjustable resistor array circuit 22; the positive input terminal of the first comparator P1 and the negative input terminal of the second comparator P2 are respectively used to input the collected electrical parameters (not shown in the figure), the negative input terminal of the first comparator P1 is connected to the first power supply through the second adjustable resistor array circuit 21, and the positive input terminal of the second comparator P2 is connected to the second power supply through the third adjustable resistor array circuit 22. The output terminal of the first comparator P1, the output terminal of the second comparator P2, the second adjustable resistor array circuit 21, and the third adjustable resistor array circuit 22 are respectively connected to a controller 30 (not shown in the figure).

[0079] Specifically, in actual scenarios, since components such as the variable frequency compressor in the photovoltaic air conditioner are driven by AC power, the collected electrical parameters input by the adjustable sampling and conditioning circuit 10 and the adjustable hardware protection circuit 20 are usually AC parameters. Therefore, in order to achieve the protection function in both the positive and negative half-cycles of the AC, it is necessary to configure a first comparator P1, a second comparator P2, a second adjustable resistor array circuit 21, and a third adjustable resistor array circuit 22. Among them, the positive input terminal of the first comparator P1 inputs the collected electrical parameters, and the first power supply is a negative voltage source (such as -15 volts). The negative input terminal of the second comparator P2 inputs the collected electrical parameters, and the second power supply is a positive voltage source (such as +15 volts). In this way, two protection thresholds can be configured, and the protection threshold range can be determined by combining the two protection thresholds, so that the protection function can be executed when the collected electrical parameters are not within the protection threshold range.

[0080] It is understood that in another embodiment, an adjustable hardware protection circuit 20 comprising a comparator and an adjustable resistor array circuit can be configured for a DC load. In this embodiment, the positive input of the comparator receives the collected electrical parameter, and the negative input of the comparator receives the adjustable resistor array circuit. By adjusting the resistance of the adjustable resistor array circuit, the input to the negative input of the comparator is changed, thereby changing the protection threshold. In this way, the protection function can be executed when the collected electrical parameter is greater than the set protection threshold. Correspondingly, the range less than or equal to the protection threshold serves as the protection threshold range.

[0081] The above scheme uses two groups of comparators and an adjustable resistor array circuit to build an adjustable hardware protection circuit 20, which can realize the circuit protection function in both the positive and negative half cycles of the collected electrical parameters, effectively improving the operating reliability of the adjustable hardware protection circuit 20.

[0082] The structure of the adjustable resistor array circuit is not unique, and any circuit that can adjust the resistance under the action of the controller 30 and thus change the reference signal of the comparator can be used. For example, see Figure 6In one embodiment, the second adjustable resistor array circuit 21 includes a fifth resistor R5, a sixth resistor R6, and a plurality of second resistor branches 211. The second resistor branches 211 include a second controllable switch and a second channel resistor connected in series. The second controllable switch is connected to a controller (not shown). The inverting input terminal of the first comparator P1 is connected to the first end of the fifth resistor R5 and the first end of the sixth resistor R6. The second end of the fifth resistor R5 is connected to a first power supply. The first ends of the second resistor branches 211 are respectively connected to the second ends of the sixth resistor R6. The second ends of the second resistor branches 211 are respectively grounded.

[0083] Specifically, the second adjustable resistor array circuit 21 of this embodiment employs a structure consistent with the first adjustable resistor array circuit 12 described above. The resistance value of the second adjustable resistor array circuit 21 is varied by controlling the number of second resistor branches 211 connected. The details are not further described. The second adjustable resistor array circuit 21 may also employ other structures, such as simply including multiple second resistor branches 211 connected in parallel, without limitation.

[0084] The above scheme uses the fifth resistor R5, the sixth resistor R6 and multiple second resistor branches 211 to form a second adjustable resistor array circuit 21. By changing the number of connected second resistor branches 211, the resistance adjustment of the second adjustable resistor array circuit 21 is achieved, which has high resistance adjustment convenience and accuracy.

[0085] and / or, see Figure 6 In one embodiment, the third adjustable resistor array circuit 22 includes a seventh resistor R7, an eighth resistor R8, and a plurality of third resistor branches 221. The third resistor branch 221 includes a third controllable switch and a third channel resistor connected in series. The third controllable switch is connected to a controller (not shown). The positive input terminal of the second comparator P2 is connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8. The second end of the seventh resistor R7 is connected to a second power supply. The first ends of the third resistor branches 221 are respectively connected to the second ends of the eighth resistor R8, and the second ends of the third resistor branches 221 are respectively grounded.

[0086] Specifically, the third adjustable resistor array circuit 22 of this embodiment employs a structure consistent with the first adjustable resistor array circuit 12 described above. The resistance value of the third adjustable resistor array circuit 22 is varied by controlling the number of third resistor branches 221 connected. The details are omitted for clarity. The third adjustable resistor array circuit 22 may also employ other structures, such as simply including multiple third resistor branches 221 connected in parallel, without limitation.

[0087] The above scheme uses the seventh resistor R7, the eighth resistor R8 and multiple third resistor branches 221 to form a third adjustable resistor array circuit 22. By changing the number of connected third resistor branches 221, the resistance adjustment of the third adjustable resistor array circuit 22 is achieved, which has high resistance adjustment convenience and accuracy.

[0088] In one embodiment, the adjustable sampling and conditioning circuit 10 includes an adjustable current sampling circuit and an adjustable voltage sampling circuit; and / or the adjustable hardware protection circuit 20 includes an adjustable overcurrent protection circuit and an adjustable overvoltage protection circuit.

[0089] Specifically, when the adjustable sampling and conditioning circuit 10 is an adjustable current sampling circuit, the corresponding input collected electrical parameter should be a current parameter. In this case, the collected current parameter can be conditioned by the adjustable sampling and conditioning circuit 10 and then output to the controller 30 for subsequent analysis and processing. If the adjustable sampling and conditioning circuit 10 is an adjustable voltage sampling circuit, the corresponding input collected electrical parameter should be a voltage parameter. In this case, the collected voltage parameter can be conditioned by the adjustable sampling and conditioning circuit 10 and then output to the controller 30 for subsequent analysis and processing.

[0090] The adjustable hardware protection circuit 20 is an adjustable overcurrent protection circuit, and the corresponding input collected electrical parameter is the current parameter. The adjustable hardware protection circuit 20 can perform the circuit protection function when overcurrent occurs; the adjustable hardware protection circuit 20 is an adjustable overvoltage protection circuit, and the corresponding input collected electrical parameter is the voltage parameter. The adjustable hardware protection circuit 20 can perform the circuit protection function when overvoltage occurs.

[0091] The above scheme can realize the conditioning sampling of voltage and current parameters, as well as overvoltage and overcurrent protection, effectively improving the operational reliability of photovoltaic air-conditioning control devices.

[0092] It should be noted that to achieve operational control of the photovoltaic air conditioner, the photovoltaic air conditioner control device may also include other functional components, which can be configured based on actual needs. For example, in one embodiment, the photovoltaic air conditioner control device also includes an IO (Input Output) control circuit. The IO control circuit connects the controller 30 and the photovoltaic inverter and can control the power-on operation of the photovoltaic inverter. The details are not detailed here.

[0093] See also Figure 7 The present application also provides a parameter configuration method based on the above-mentioned photovoltaic air conditioning control device, including step 702, step 704 and step 706.

[0094] Step 702: Determine the power level of the photovoltaic inverter of the photovoltaic air conditioner.

[0095] Step 704 : Determine the required conditioning coefficient of the adjustable sampling conditioning circuit 10 and the required protection threshold range of the adjustable hardware protection circuit 20 according to the power level.

[0096] Step 706 , controlling the adjustable sampling conditioning circuit 10 to operate with the conditioning coefficient, and controlling the adjustable hardware protection circuit 20 to operate with the protection threshold range.

[0097] Specifically, the structure of the photovoltaic air conditioning control device is as shown in the above-mentioned embodiments and accompanying drawings, and will not be further described here. The power level of the photovoltaic inverter is also the rated output power level of the photovoltaic inverter. The level here can be a power range or a specific power value, and is not specifically limited. In actual scenarios, the controller 30 can determine the required conditioning coefficient and protection threshold range at the power level based on the power level of the photovoltaic inverter. Then, the operating state of the adjustable sampling conditioning circuit 10 is adjusted based on the conditioning coefficient, ultimately causing the adjustable sampling conditioning circuit 10 to operate at the determined conditioning coefficient. The controller 30 can also adjust the operating state of the adjustable hardware protection circuit 20 based on the protection threshold range, ultimately causing the adjustable hardware protection circuit 20 to operate within the determined protection threshold range. In this way, by adjusting the operating states of the adjustable sampling conditioning circuit 10 and the adjustable hardware protection circuit 20, the conditioning coefficient and protection threshold range can be configured, thereby achieving mainboard parameter configuration.

[0098] With this parameter configuration method, the PV AC control unit's conditioning coefficient and protection threshold range can be adjusted based on the power level of the connected PV inverter, thereby adapting to the PV inverter. This allows a single PV AC control unit to be compatible with multiple PV inverters of varying power levels, significantly improving its applicability and reducing maintenance.

[0099] See also Figure 8 In one embodiment, step 702 includes step 802 and step 804.

[0100] Step 802: Obtain the bus capacitance value of the photovoltaic inverter of the photovoltaic air conditioner.

[0101] Step 804: Determine the power level of the photovoltaic inverter according to the bus capacitance value.

[0102] Specifically, the busbar capacitance value is also the capacitance of the busbar capacitor of the PV inverter. In actual scenarios, considering that the rated power of the PV inverter is related to the busbar capacitance, the busbar capacitance value can be used for analysis to determine the power level of the PV inverter.

[0103] It is understood that in other embodiments, the power level of the photovoltaic inverter can also be determined by other means, such as direct input by the user, or direct matching and determination based on the model of the photovoltaic inverter, etc., which will not be repeated here.

[0104] The above solution combines the busbar capacitance value of the photovoltaic inverter to determine the power level of the photovoltaic inverter, ensuring the accuracy of the power level.

[0105] See also Figure 9 In one embodiment, step 802 includes step 902 and step 904.

[0106] Step 902 : When the photovoltaic inverter of the photovoltaic air conditioner is powered on and running, the charging time for the bus capacitor of the photovoltaic inverter to be charged to a preset voltage threshold is obtained.

[0107] Step 904: Determine the bus capacitance value of the photovoltaic inverter according to the charging time.

[0108] Specifically, there is not only one way to obtain the busbar capacitance value of the photovoltaic inverter. In one embodiment, it can be determined by user input or by direct matching in combination with the model of the photovoltaic inverter, etc., which will not be described in detail here.

[0109] This embodiment takes into account that in actual scenarios, the busbar capacitor's capacitance value may change due to aging effects, operating environment, and other factors. To improve the accuracy of the power level, this embodiment conducts tests based on actual operating environments to determine the busbar capacitor value of the photovoltaic inverter. The photovoltaic inverter's power-up operation can be either the initial power-up, with no subsequent adjustment of the conditioning coefficient and protection threshold range, or a non-initial power-up operation, where the conditioning coefficient and protection threshold range are updated at any time in actual scenarios. This is not specifically limited.

[0110] Specifically, when the photovoltaic inverter is powered on and begins charging, the charging voltage and charging time of the bus capacitor can be collected in real time. This information can be analyzed and calculated based on the time it takes for the charging voltage to reach a preset voltage threshold, ultimately determining the bus capacitor value. It is understood that the specific analysis method is not exclusive. In one embodiment, the charging time can be substituted into the corresponding relationship for matching. In another embodiment, the bus capacitor value can be calculated using a corresponding calculation formula. This is not a specific limitation.

[0111] The size of the preset voltage threshold is not unique. It can be a certain multiple (less than or equal to 1) of the full charge voltage when the bus capacitor is fully charged, such as 90% of the full charge voltage, and is not specifically limited.

[0112] For ease of understanding, the bus capacitor is charged with a normal 400V AC voltage. When the bus capacitor is fully charged, the full charge voltage is 530V. The bus voltage is collected based on the DC bus voltage sampling. When the bus capacitor is charged to 90%, according to the formula Calculation is performed, where R is the charging resistance value (which can be preset to determine the resistance value), t is the time it takes for the bus capacitor voltage to charge from 0 to 90% of the full charge voltage, and C is the capacity value of the bus capacitor.

[0113] The above solution calculates the bus capacitance value by collecting the charging time of the bus capacitance of the photovoltaic inverter to a preset voltage threshold, thereby ensuring the accuracy of the bus capacitance value.

[0114] See also Figure 10 , in one embodiment, step 804 includes step 1002.

[0115] Step 1002 : performing a matching analysis based on the busbar capacitance value and the correspondence between the preset capacitance value and the power level to determine the power level of the photovoltaic inverter.

[0116] Specifically, this embodiment pre-stores a correspondence between capacitance and power level. After analyzing and determining the busbar capacitance value, the power level can be determined by simply substituting this correspondence for matching. It is understood that in other embodiments, a power level calculation formula can be obtained by fitting analysis, and the busbar capacitance value can be substituted into this calculation formula to calculate and determine the power level. The specific selection can be based on actual needs.

[0117] The above solution determines the power level by matching the bus capacitance value with the corresponding relationship between the preset capacitance value and the power level, which has a high power level determination efficiency.

[0118] See also Figure 11 In one embodiment, step 704 includes step 112 and step 114 .

[0119] Step 112: Calculate according to the power level to determine the rated electrical parameters of the photovoltaic inverter.

[0120] Step 114 : determining the required conditioning coefficient of the adjustable sampling conditioning circuit 10 and the required protection threshold range of the adjustable hardware protection circuit 20 based on the rated electrical parameter analysis and calculation.

[0121] Specifically, the rated electrical parameters are also the electrical parameters of the photovoltaic inverter during rated operation, which may be voltage parameters, current parameters, etc., and are not specifically limited.

[0122] For ease of understanding, the following explanation is given by taking the rated electrical parameter as the rated current and the photovoltaic air conditioning control device to implement current collection and overcurrent protection. After determining the power level of the photovoltaic inverter, the controller 30 can calculate the required current protection threshold and current conditioning coefficient based on the grid voltage of the photovoltaic air conditioner and the power level of the photovoltaic inverter. For example, when the inverter power level is determined to be 400kW (kilowatts), the grid voltage is 400V, and the calculation is performed according to the formula P = 1.732*U*I*k, where U is the grid voltage, I is the rated current, and k is the reserved margin (usually 1.1, set according to actual needs).

[0123] After that, the current protection threshold and the current conditioning factor are determined in combination with the rated current. For example, a preset multiple (greater than 1, such as 1.2 times, etc.) of the rated current can be used as the current protection threshold, which is not specifically limited.

[0124] The above scheme first determines the rated electrical parameters in combination with the power level calculation, and then uses the rated electrical parameters to determine the required conditioning coefficient and protection threshold range to ensure the accuracy of the conditioning coefficient and protection threshold range.

[0125] The present application also provides a photovoltaic air conditioner, including a photovoltaic inverter and the above-mentioned photovoltaic air conditioner control device, the photovoltaic inverter is connected to the photovoltaic air conditioner control device, and the controller 30 is used to execute the steps of the above-mentioned parameter configuration method.

[0126] Specifically, the structure of the photovoltaic air conditioning control device and the implementation of the parameter configuration method are described in detail in the various embodiments and accompanying figures above and will not be further elaborated here. In this photovoltaic air conditioner, the conditioning coefficient and protection threshold range of the photovoltaic air conditioning control device can be adjusted based on the power level of the connected photovoltaic inverter, thereby adapting to the photovoltaic inverter. This allows a single photovoltaic air conditioning control device to be compatible with multiple photovoltaic inverters of different power levels, greatly improving the applicability of the photovoltaic air conditioning control device and reducing maintenance work.

[0127] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A photovoltaic air conditioning control device, characterized in that: include: Adjustable sampling and conditioning circuit; Adjustable hardware protection circuit; A controller is connected to the adjustable sampling and conditioning circuit and the adjustable hardware protection circuit. The controller is used to determine the conditioning coefficient required by the adjustable sampling and conditioning circuit and the protection threshold range required by the adjustable hardware protection circuit according to the power level of the photovoltaic inverter of the photovoltaic air conditioner, and control the adjustable sampling and conditioning circuit to operate with the conditioning coefficient and control the adjustable hardware protection circuit to operate within the protection threshold range.

2. The photovoltaic air conditioning control device according to claim 1, characterized in that: The adjustable sampling and conditioning circuit includes an operational amplifier, a feedback circuit and a first adjustable resistor array circuit; The positive input terminal of the operational amplifier is connected to the first adjustable resistor array circuit, which is used to input and collect electrical parameters. The feedback circuit is connected to the negative input terminal of the operational amplifier and the output terminal of the operational amplifier. The output terminal of the operational amplifier and the first adjustable resistor array circuit are respectively connected to the controller.

3. The photovoltaic air conditioning control device according to claim 2, characterized in that: The first adjustable resistor array circuit includes a first resistor, a second resistor and multiple first resistor branches, the first resistor branch includes a first controllable switch and a first channel resistor connected in series, the first end of the first resistor is used to input the collected electrical parameters, the second end of the first resistor is connected to the first end of the second resistor and the positive input end of the operational amplifier, the first end of each first resistor branch is respectively connected to the second end of the second resistor, the second end of each first resistor branch is respectively grounded, and the first controllable switch is connected to the controller.

4. The photovoltaic air conditioning control device according to claim 2, characterized in that: The feedback circuit includes a third resistor and a fourth resistor, a first end of the third resistor is grounded, a second end of the third resistor is connected to the first end of the fourth resistor and the inverting input terminal of the operational amplifier, and a second end of the fourth resistor is connected to the output terminal of the operational amplifier; Alternatively, the feedback circuit includes a third resistor, a fourth resistor and a filter capacitor, the first end of the third resistor is grounded, the second end of the third resistor is connected to the first end of the fourth resistor and the inverting input end of the operational amplifier, the second end of the fourth resistor is connected to the output end of the operational amplifier, the first end of the filter capacitor is connected to the first end of the fourth resistor, and the second end of the filter capacitor is connected to the second end of the fourth resistor.

5. The photovoltaic air conditioning control device according to any one of claims 1 to 4, characterized in that: The adjustable hardware protection circuit includes a first comparator, a second comparator, a second adjustable resistor array circuit and a third adjustable resistor array circuit; The positive input terminal of the first comparator and the negative input terminal of the second comparator are respectively used to input the collected electrical parameters, the negative input terminal of the first comparator is connected to the first power supply through the second adjustable resistor array circuit, the positive input terminal of the second comparator is connected to the second power supply through the third adjustable resistor array circuit, and the output terminal of the first comparator, the output terminal of the second comparator, the second adjustable resistor array circuit and the third adjustable resistor array circuit are respectively connected to the controller.

6. The photovoltaic air conditioning control device according to claim 5, characterized in that: The second adjustable resistor array circuit includes a fifth resistor, a sixth resistor, and a plurality of second resistor branches, the second resistor branches including a second controllable switch and a second channel resistor connected in series, the second controllable switch being connected to the controller, the inverting input terminal of the first comparator being connected to the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor being connected to the first power supply, the first ends of the second resistor branches being respectively connected to the second ends of the sixth resistors, and the second ends of the second resistor branches being respectively grounded; And / or, the third adjustable resistor array circuit includes a seventh resistor, an eighth resistor and multiple third resistor branches, the third resistor branch includes a third controllable switch and a third channel resistor connected in series, the third controllable switch is connected to the controller, the positive input end of the second comparator is connected to the first end of the seventh resistor and the first end of the eighth resistor, the second end of the seventh resistor is connected to the second power supply, the first ends of the third resistor branches are respectively connected to the second ends of the eighth resistors, and the second ends of the third resistor branches are respectively grounded.

7. The photovoltaic air conditioning control device according to any one of claims 1 to 4, characterized in that: The adjustable sampling and conditioning circuit includes an adjustable current sampling circuit and an adjustable voltage sampling circuit; and / or the adjustable hardware protection circuit includes an adjustable overcurrent protection circuit and an adjustable overvoltage protection circuit.

8. A parameter configuration method based on the photovoltaic air conditioning control device according to any one of claims 1 to 7, characterized in that: include: Determine the power level of the photovoltaic inverter of the photovoltaic air conditioner; Determining, according to the power level, a conditioning coefficient required by the adjustable sampling conditioning circuit and a protection threshold range required by the adjustable hardware protection circuit; The adjustable sampling conditioning circuit is controlled to operate with the conditioning coefficient, and the adjustable hardware protection circuit is controlled to operate with the protection threshold range.

9. The parameter configuration method according to claim 8, characterized in that: Determining the power level of the photovoltaic inverter of the photovoltaic air conditioner includes: Get the bus capacitance value of the photovoltaic inverter of the photovoltaic air conditioner; The power level of the photovoltaic inverter is determined according to the bus capacitance value.

10. The parameter configuration method according to claim 9, characterized in that: The obtaining of the bus capacitance value of the photovoltaic inverter of the photovoltaic air conditioner includes: When a photovoltaic inverter of a photovoltaic air conditioner is powered on and running, obtaining a charging time for a bus capacitor of the photovoltaic inverter to be charged to a preset voltage threshold; The bus capacitance value of the photovoltaic inverter is determined according to the charging time.

11. The parameter configuration method according to claim 9, characterized in that: Determining the power level of the photovoltaic inverter according to the bus capacitance value includes: A matching analysis is performed based on the busbar capacitance value and the corresponding relationship between the preset capacitance value and the power level to determine the power level of the photovoltaic inverter.

12. The parameter configuration method according to claim 8, characterized in that: Determining, according to the power level, a conditioning coefficient required by the adjustable sampling conditioning circuit and a protection threshold range required by the adjustable hardware protection circuit includes: Calculating according to the power level to determine the rated electrical parameters of the photovoltaic inverter; According to the rated electrical parameter analysis and calculation, the conditioning coefficient required by the adjustable sampling conditioning circuit and the protection threshold range required by the adjustable hardware protection circuit are determined.

13. A photovoltaic air conditioner, characterized in that: It comprises a photovoltaic inverter and the photovoltaic air-conditioning control device according to any one of claims 1-7, the photovoltaic inverter is connected to the photovoltaic air-conditioning control device, and the controller is used to execute the steps of the parameter configuration method according to any one of claims 8-12.

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