Method and device for controlling compressor of heat exchange equipment and heat exchange equipment

Abstract

The invention relates to the technical field of intelligent household appliances, and discloses a method for controlling a compressor of heat exchange equipment. The heat exchange equipment comprises a frequency conversion rectification circuit and a compressor, the frequency conversion rectification circuit comprises a rectifier bridge and an electrolytic capacitor arranged at the output of the rectifier bridge, and the electrolytic capacitor is connected with the compressor in parallel; the method comprises the steps of obtaining capacitor voltage values at two ends of an electrolytic capacitor in a variable-frequency rectification circuit; determining a target instruction speed according to the capacitor voltage value; the target operation frequency of the compressor is determined according to the target instruction speed; and controlling the compressor to operate according to the target operation frequency. According to the method, the instruction speed is adjusted in time according to the capacitance voltage change trend at the two ends of the electrolytic capacitor, so that the instruction speed reaches the target instruction speed, the operation frequency of the compressor reaches the target operation frequency, and the refrigeration effect of the heat exchange equipment is improved. The invention further discloses a device for controlling the compressor of the heat exchange equipment and the heat exchange equipment.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, for example, to a method, device and heat exchange device for controlling a compressor of a heat exchange device. Background Art

[0002] In the hot summer, some areas will experience high temperatures, and at this time the demand for cooling of heat exchange equipment will be higher, which requires the compressor of the heat exchange equipment to be able to provide stable cooling.

[0003] In order to improve the stability of compressor refrigeration, the related art discloses a method for controlling the compressor of a heat exchange device. The method includes: obtaining various temperatures required to determine the initial demand; in response to the working mode of the compressor, calculating the initial demand according to the various temperatures obtained; determining the starting frequency of the compressor according to the initial demand, and starting the compressor. After starting the compressor, the real-time demand is calculated according to the temperature set by the user, the target operating frequency of the compressor is determined based on the real-time demand, and the operating frequency of the variable frequency compressor is adjusted.

[0004] In the process of implementing the embodiments of the present disclosure, it was found that there are at least the following problems in the related technology: the related technology performs refrigeration when the ambient temperature is extremely high. The high temperature will limit the operating frequency of the compressor, making it difficult for the compressor to maintain within the required operating frequency range, resulting in the compressor still being difficult to achieve stable refrigeration, thereby resulting in poor refrigeration stability of the heat exchange equipment.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide a method, an apparatus and a heat exchange device for controlling a compressor of a heat exchange device, which can improve the operating stability of the compressor of the heat exchange device in a cooling working mode, thereby improving the cooling stability of the heat exchange device.

[0008] In some embodiments, the heat exchange equipment includes a variable frequency rectifier circuit and a compressor, wherein the variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor arranged at the output of the rectifier bridge, and the electrolytic capacitor is connected in parallel with the compressor; the method for controlling the compressor of the heat exchange equipment includes: obtaining the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit; determining the target command speed according to the capacitor voltage value; determining the target operating frequency of the compressor according to the target command speed; and controlling the compressor to operate at the target operating frequency.

[0009] Optionally, the capacitor voltage value includes a capacitor voltage difference and a capacitor voltage maximum value; wherein, determining the target command speed based on the capacitor voltage value includes: determining the target command speed based on the size relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the size relationship between the capacitor voltage maximum value and the capacitor voltage maximum threshold value.

[0010] Optionally, the target command speed is determined based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the capacitor voltage maximum and the capacitor voltage maximum threshold, including: when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum is less than or equal to the capacitor voltage maximum threshold, obtaining the current command speed; and using the current command speed as the target command speed.

[0011] Optionally, the target command speed is determined based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the capacitor voltage maximum and the capacitor voltage maximum threshold, including: when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum is less than or equal to the capacitor voltage maximum threshold, obtaining the sampled total current in the variable frequency rectifier circuit and the exhaust temperature of the compressor; when the sampled total current is less than the current threshold, and the exhaust temperature of the compressor is less than the exhaust temperature threshold, obtaining the current command speed; and using the current command speed as the target command speed.

[0012] Optionally, the target command speed is determined based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the capacitor voltage maximum and the capacitor voltage maximum threshold, including: when the capacitor voltage difference is greater than the capacitor voltage difference threshold, and the capacitor voltage maximum is greater than the capacitor voltage maximum threshold, adjusting the previous command speed to obtain the target command speed.

[0013] Optionally, the previous command speed is adjusted as follows to obtain the target command speed:

[0014] ωr * (n) = ωr * (n-1)-t×ωr * (n-1)

[0015] Among them, ωr *(n) is the target command speed, ωr * (n-1) is the previous command speed, t is the adjustment coefficient, and n is the acquisition number of the command speed.

[0016] Optionally, the capacitor voltage difference threshold is determined in the following manner: obtaining the current operating frequency of the compressor; when the current operating frequency of the compressor is equal to the first operating frequency threshold, obtaining a first voltage difference between a first maximum capacitor voltage value and a first minimum capacitor voltage value within a preset time length; using the first voltage difference as the capacitor voltage difference threshold; and / or, determining the capacitor voltage maximum threshold is determined in the following manner: obtaining the current operating frequency of the compressor; when the current operating frequency of the compressor is equal to the first operating frequency threshold, obtaining a first maximum capacitor voltage value within a preset time length; using the first maximum capacitor voltage value as the capacitor voltage maximum threshold.

[0017] Optionally, the method also includes: obtaining a current command speed before obtaining a capacitor voltage value across an electrolytic capacitor in a variable frequency rectifier circuit; determining a current operating frequency of the compressor based on the current command speed; and determining that the current operating frequency is greater than a second operating frequency threshold.

[0018] Optionally, the method further includes: when the current operating frequency is less than or equal to a second operating frequency threshold, taking the current operating frequency as the target operating frequency; and controlling the compressor to operate according to the target operating frequency.

[0019] In some embodiments, the apparatus for controlling the compressor of a heat exchange device includes a processor and a memory storing program instructions, and the processor is configured to execute the method for controlling the compressor of a heat exchange device as described above when running the program instructions.

[0020] In some embodiments, the heat exchange device includes: a heat exchange device body; a compressor, which is arranged on the heat exchange device body; a variable frequency rectifier circuit, including a rectifier bridge and an electrolytic capacitor arranged at the output of the rectifier bridge, the electrolytic capacitor is connected in parallel with the compressor; and, a device for controlling the compressor of the heat exchange device as described above, which is installed on the heat exchange device body.

[0021] The method, device and heat exchange device for controlling the compressor of a heat exchange device provided in the embodiments of the present disclosure can achieve the following technical effects:

[0022] By obtaining the capacitor voltage value at both ends of the electrolytic capacitor in the variable frequency rectifier circuit, the capacitor voltage change trend at both ends of the electrolytic capacitor can be determined, thereby monitoring the change of the actual current value in the variable frequency rectifier circuit, and then reflecting the change of the operating frequency of the compressor. At the same time, the operating frequency of the compressor can be accurately adjusted by adjusting the command speed. Therefore, the method determines the target command speed by the capacitor voltage change trend at both ends of the electrolytic capacitor, and adjusts the compressor operating frequency by the target command speed so that the compressor operating frequency reaches the target operating frequency. On the other hand, by controlling the compressor to operate at the target operating frequency, the actual current value in the variable frequency rectifier circuit can be controlled to be stable, so that the operating frequency of the compressor and the actual current value in the variable frequency rectifier circuit form a benign closed loop, which promotes each other's stability. In this way, through the above-mentioned positive feedback control method, the operating stability of the compressor of the heat exchange device in the refrigeration working mode can be improved, thereby improving the refrigeration stability of the heat exchange device.

[0023] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0025] Figure 1 is a structural schematic diagram of a variable frequency rectifier circuit in a heat exchange device provided in an embodiment of the present disclosure;

[0026] Figure 2 is a schematic diagram of a method for controlling a compressor of a heat exchange device provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of another method for controlling a compressor of a heat exchange device provided by an embodiment of the present disclosure;

[0028] Figure 4 is a schematic diagram of another method for controlling a compressor of a heat exchange device provided by an embodiment of the present disclosure;

[0029] Figure 5 is a schematic diagram of a device for controlling a compressor of a heat exchange device provided by an embodiment of the present disclosure;

[0030] Figure 6 It is a schematic diagram of a heat exchange equipment product provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0032] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0035] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0037] The present disclosure provides a heat exchange device, which includes a variable frequency rectifier circuit, a compressor and an electronic control device (not shown in the figure). Figure 1As shown, the variable frequency rectifier circuit 10 includes a power supply terminal 103, a rectifier bridge 101 and an electrolytic capacitor 102 arranged at the output of the rectifier bridge 101, and the electrolytic capacitor 102 is connected in parallel with the compressor 20. Among them, the power supply terminal 103 is used to output alternating current. The rectifier bridge 101 is used to convert alternating current into pulsating direct current. The electrolytic capacitor 102 is used to convert the pulsating direct current voltage into a relatively stable direct current voltage, and to filter out high frequency and pulse interference in the pulsating direct current. The electronic control device includes a processor. The processor is used to control the operation of the compressor 20 to realize various functions of the heat exchange device. Optionally, the rectifier bridge 101 includes a first rectifier branch 1021 and a second rectifier branch 1022. Two diodes are connected to the second rectifier branch, and two diodes are connected to the second rectifier branch. The first end of the power supply terminal 103 is connected between the two diodes of the first rectifier branch 1021, and the second end of the power supply terminal 103 is connected between the two diodes of the second rectifier branch 1022. The rectifier bridge 101 converts the AC power whose level fluctuates above and below the zero point into unidirectional pulsating DC power through the unidirectional conduction characteristic of the diode.

[0038] Optionally, the variable frequency rectifier circuit 10 further includes a reactor 104, which is connected to the circuit between the first end of the power supply terminal 103 and the first rectifier branch 1021. The reactor is used to limit the current flowing through to prevent the rectifier bridge 101 from being damaged by excessive current.

[0039] Optionally, the variable frequency rectifier circuit 10 further includes a total current sampling resistor 105, which is connected to a circuit between one end of the rectifier bridge 101 and one end of the capacitor electrolysis 102. The total current sampling resistor 105 is used to collect a sampled total current in the variable frequency rectifier circuit. The sampled total current represents an effective current value in the variable frequency rectifier circuit.

[0040] Optionally, the heat exchange device further comprises a speed control system, wherein the speed control system is used to adjust the command speed.

[0041] In combination with the above-mentioned heat exchange device, the present disclosure provides a method for controlling a compressor of the heat exchange device. Figure 2 As shown, the method includes:

[0042] S201, the processor obtains the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit.

[0043] S202: The processor determines a target command speed according to a capacitor voltage value.

[0044] S203: The processor determines a target operating frequency of the compressor according to the target command speed.

[0045] S204: The processor controls the compressor to operate according to the target operating frequency.

[0046] In this embodiment, by obtaining the capacitor voltage value at both ends of the electrolytic capacitor in the variable frequency rectifier circuit, the capacitor voltage change trend at both ends of the electrolytic capacitor can be determined, thereby monitoring the change of the actual current value in the variable frequency rectifier circuit, and then reflecting the change of the operating frequency of the compressor. At the same time, the operating frequency of the compressor can be accurately adjusted by adjusting the command speed. Therefore, the method determines the target command speed by the capacitor voltage change trend at both ends of the electrolytic capacitor, thereby adjusting the compressor operating frequency by the target command speed so that the compressor operating frequency reaches the target operating frequency. On the other hand, by controlling the compressor to operate at the target operating frequency, the actual current value in the variable frequency rectifier circuit can be controlled to be stable, so that the operating frequency of the compressor and the actual current value in the variable frequency rectifier circuit form a benign closed loop, and promote each other's stability. In this way, through the above-mentioned positive feedback control method, the operating stability of the compressor of the heat exchange device in the refrigeration working mode can be improved, thereby improving the refrigeration stability of the heat exchange device.

[0047] Optionally, the capacitor voltage value includes a capacitor voltage difference and a capacitor voltage maximum value.

[0048] Optionally, the processor determines the target command speed according to the capacitor voltage value, including: the processor determines the target command speed according to the magnitude relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the magnitude relationship between the capacitor voltage maximum value and the capacitor voltage maximum threshold.

[0049] In this embodiment, the current condition in the variable frequency rectifier circuit can be determined through the capacitor voltage difference and the capacitor voltage maximum value, so that the target command speed is determined according to the current condition in the variable frequency rectifier circuit to avoid excessive deviation of the current in the variable frequency rectifier circuit, thereby making the adjusted operating frequency of the compressor more accurate.

[0050] Optionally, the processor determines the target command speed according to the magnitude relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the magnitude relationship between the capacitor voltage maximum and the capacitor voltage maximum threshold, including: the processor obtains the current command speed when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum is less than or equal to the capacitor voltage maximum threshold. The processor uses the current command speed as the target command speed.

[0051] In this embodiment, when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum value is less than or equal to the capacitor voltage maximum threshold value, it indicates that the current in the variable frequency rectifier circuit has not deviated too much at this time. Therefore, the target instruction speed can be controlled to run at the current instruction speed, thereby accurately adjusting the operating frequency of the compressor and making the compressor run stably.

[0052] Optionally, the processor determines the target command speed according to the size relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the size relationship between the capacitor voltage maximum and the capacitor voltage maximum threshold, including: the processor obtains the sampled total current in the variable frequency rectifier circuit and the exhaust temperature of the compressor when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum is less than or equal to the capacitor voltage maximum threshold. The processor obtains the current command speed when the sampled total current is less than the current threshold and the exhaust temperature of the compressor is less than the exhaust temperature threshold. The current command speed is used as the target command speed.

[0053] Exemplarily, the current threshold is the upper limit current value specified for the model of heat exchange equipment. Different models of heat exchange equipment have different value ranges for the current threshold. Exemplarily, the exhaust temperature threshold is the upper limit exhaust temperature value specified for the model of heat exchange equipment. Different models of heat exchange equipment have different value ranges for the exhaust temperature threshold.

[0054] In this embodiment, on the basis that the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum value is less than or equal to the capacitor voltage maximum threshold, the judgment condition that the sampled total current is less than the current threshold, and the exhaust temperature of the compressor is less than the exhaust temperature threshold is introduced to further comprehensively determine the situation of the variable frequency rectifier circuit, thereby improving the accuracy of adjusting the target instruction speed, thereby making the compressor operation more stable.

[0055] Optionally, the processor determines the target instruction speed based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the capacitor voltage maximum and the capacitor voltage maximum threshold, including: when the capacitor voltage difference is greater than the capacitor voltage difference threshold, and the capacitor voltage maximum is greater than the capacitor voltage maximum threshold, the processor adjusts the previous instruction speed to obtain the target instruction speed.

[0056] In this embodiment, when the capacitor voltage difference is greater than the capacitor voltage difference threshold and the capacitor voltage maximum value is greater than the capacitor voltage maximum threshold value, it indicates that the current in the variable frequency rectifier circuit is large. In order to avoid excessive current deviation in the variable frequency rectifier circuit, the previous instruction speed is adjusted to adjust the operating frequency of the compressor to avoid the compressor stopping working, so as to improve the cooling effect of the heat exchange equipment and improve the user experience.

[0057] Optionally, the processor adjusts the previous instruction speed as follows to obtain the target instruction speed:

[0058] ωr * (n) = ωr * (n-1)-t×ωr * (n-1)

[0059] Among them, ωr *(n) is the target command speed, ωr * (n-1) is the previous command speed, t is the adjustment coefficient, and n is the acquisition number of the command speed.

[0060] Exemplarily, the time interval between the target command speed and the previous command speed is set to one processing cycle in the program. Specifically, the time interval between the current moment and the previous moment is set to 250 ms (milliseconds).

[0061] Exemplarily, t is set to [0.1, 0.3]. Specifically, t is set to 0.2. By setting t to the above range, the previous command speed can be accurately adjusted, so that the target command speed is more accurate.

[0062] In this embodiment, by reducing the previous command speed, the target command speed is reduced compared with the previous command speed, thereby reducing the operating frequency of the compressor, and then reducing the current in the variable frequency rectifier circuit, so as to avoid excessive current deviation in the variable frequency rectifier circuit. At the same time, through this algorithm, the target command speed can be accurately obtained, and the operating frequency of the compressor can be further controlled to remain within the target operating frequency range, thereby improving the operating stability of the compressor.

[0063] Optionally, the processor determines the capacitor voltage difference threshold value in the following manner: the processor obtains the compressor operating frequency. When the compressor operating frequency is equal to the first operating frequency threshold value, the processor obtains a first voltage difference between a first maximum capacitor voltage value and a first minimum capacitor voltage value within a preset time length. The processor uses the first voltage difference as the capacitor voltage difference threshold value.

[0064] Exemplarily, the first operating frequency threshold is set to 0 Hz (Hertz).

[0065] Exemplarily, the processor determines the preset duration in the following manner: the processor obtains the mains frequency. The processor calculates T1=1 / f×2 to obtain the preset duration. Wherein, T1 is the preset duration, and f is the mains frequency. Specifically, the preset duration is set to 40s or 33.33s.

[0066] In this embodiment, when the first preset frequency is set to 0 Hz, it indicates that the compressor is in a shutdown state. The capacitor voltage difference threshold value obtained in this state represents the voltage condition of the power supply, without fluctuation or interference. Therefore, the first difference between the maximum capacitor voltage value and the minimum capacitor voltage value when the compressor is in a shutdown state is used as the capacitor voltage difference threshold value, and the capacitor voltage difference value is compared and analyzed with the determined capacitor voltage difference threshold value, so that the analysis result is more accurate and stable.

[0067] Optionally, the processor determines the maximum capacitor voltage threshold in the following manner: the processor obtains the compressor operating frequency. When the compressor operating frequency is equal to the first operating frequency threshold, the processor obtains a first maximum capacitor voltage value within a preset time period. The processor uses the first maximum capacitor voltage value as the maximum capacitor voltage threshold.

[0068] In this embodiment, when the first preset frequency is set to 0 Hz, it indicates that the compressor is in a shutdown state. The capacitor voltage difference threshold value obtained in this state represents the voltage condition of the power supply, without fluctuation or interference. Therefore, the first voltage difference between the first maximum capacitor voltage value and the first minimum capacitor voltage value when the compressor is in a shutdown state is used as the capacitor voltage difference threshold value, and the capacitor voltage difference value is compared and analyzed with the determined capacitor voltage difference threshold value, so that the analysis result is more accurate, stable, and interference-free.

[0069] Optionally, the processor obtains the capacitor voltage difference in the following manner: the processor obtains the compressor operating frequency. When the compressor operating frequency is greater than the second operating frequency threshold, the processor obtains a second voltage difference between a second maximum capacitor voltage value and a second minimum capacitor voltage value within a preset time length. The processor uses the second voltage difference as the capacitor voltage difference. Exemplarily, the second operating frequency threshold is set to [50Hz, 60Hz]. The second operating frequency threshold represents a reference value of the operating frequency of the compressor. When the operating frequency is greater than the second operating frequency threshold, it indicates that the operating frequency of the compressor is relatively high at this time.

[0070] In this embodiment, by comparing the compressor operating frequency with the second operating frequency threshold, it can be determined whether the compressor operating frequency is relatively high. In the case where the compressor operating frequency is relatively high, by using the second voltage difference between the obtained second maximum capacitor voltage value and the second minimum capacitor voltage value as the capacitor voltage difference, the adjusted target command speed is made more reasonable.

[0071] Optionally, the processor obtains the maximum capacitor voltage in the following manner: the processor obtains the compressor operating frequency. When the compressor operating frequency is greater than the second operating frequency threshold, the processor obtains the second maximum capacitor voltage value within a preset time period, and the processor uses the second maximum capacitor voltage value as the maximum capacitor voltage.

[0072] In this embodiment, when the operating frequency of the compressor is relatively high, the second maximum capacitor voltage value is obtained as the capacitor voltage maximum value, so that the adjusted target instruction speed is more reasonable.

[0073] Optionally, the processor determines the target operating frequency of the compressor according to the target command speed, including: the processor calculates F=ωr / (2×Π×p) to obtain the target operating frequency of the compressor. Wherein, F is the target operating frequency of the compressor, ωr* is the target command speed, and P is the number of compressor pole pairs.

[0074] Optionally, after determining the target command speed, the process further includes: the processor inputting the target command speed to the speed control system to adjust the current command speed of the speed control system to the target command speed. In this way, the feedback command speed of the speed control system can be automatically adjusted to the target command speed, which is accurate and convenient.

[0075] like Figure 3 As shown, the embodiment of the present disclosure provides another method for controlling a compressor of a heat exchange device. The method comprises:

[0076] S301, the processor obtains the current instruction speed.

[0077] S302: The processor determines the current operating frequency of the compressor according to the current command speed.

[0078] S303: The processor determines that the current operating frequency is greater than a second operating frequency threshold.

[0079] S304, the processor obtains the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit.

[0080] S305: The processor determines a target command speed according to the capacitor voltage value.

[0081] S306: The processor determines a target operating frequency of the compressor according to the target command speed.

[0082] S307: The processor controls the compressor to operate according to the target operating frequency.

[0083] In this embodiment, by comparing the compressor operating frequency with the second operating frequency threshold, it can be determined whether the compressor operating frequency is relatively high. In the case where the compressor operating frequency is relatively high, the target command speed to be adjusted is made more accurate by obtaining the capacitor voltage value.

[0084] like Figure 4 As shown, the embodiment of the present disclosure provides another method for controlling a compressor of a heat exchange device. The method comprises:

[0085] S401, the processor obtains the current instruction speed.

[0086] S402: The processor determines the current operating frequency of the compressor according to the current command speed.

[0087] S403: The processor determines that the current operating frequency is greater than a second operating frequency threshold.

[0088] S404, the processor obtains the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit.

[0089] S405: The processor determines a target command speed according to the capacitor voltage value.

[0090] S406: The processor determines a target operating frequency of the compressor according to the target command speed.

[0091] S407: When the current operating frequency is less than or equal to the second operating frequency threshold, the processor uses the current operating frequency as the target operating frequency.

[0092] S408: The processor controls the compressor to operate according to the target operating frequency.

[0093] In this embodiment, when the current operating frequency is less than or equal to the second operating frequency threshold, it indicates that the current of the variable frequency rectifier circuit will not deviate too much. Therefore, in this case, the compressor can be controlled to operate according to the current operating frequency, and the operating frequency of the compressor does not need to be adjusted, thereby further improving the stability of the compressor operation.

[0094] Combination Figure 5 , the embodiment of the present disclosure provides a device 200 for controlling the compressor of a heat exchange device, including a processor (processor) 500 and a memory (memory) 501. Optionally, the device 200 for controlling the compressor of a heat exchange device may also include a communication interface (Communication Interface) 502 and a bus 503. Among them, the processor 500, the communication interface 502, and the memory 501 can communicate with each other through the bus 503. The communication interface 602 can be used for information transmission. The processor 500 can call the logic instructions in the memory 501 to execute the method for controlling the compressor of the heat exchange device of the above embodiment.

[0095] In addition, the logic instructions in the memory 501 described above can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[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 functional applications and data processing by running the program instructions / modules stored in the memory 501, that is, the method for controlling the compressor of the heat exchange device in the above embodiment is implemented.

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

[0098] Combination Figure 6 As shown, an embodiment of the present disclosure provides a heat exchange device 1. The heat exchange device 1 includes: a heat exchange device body 10, a compressor, a variable frequency rectifier circuit and a device 200 for controlling the compressor of the heat exchange device as described above. The installation relationship described here is not limited to placement inside the heat exchange device 1, but also includes installation connections with other components of the heat exchange device 1, including but not limited to physical connections, electrical connections or signal transmission connections, etc. Those skilled in the art can understand that the device 200 for controlling the compressor of the heat exchange device can be adapted to a feasible heat exchange device body 10, thereby realizing other feasible embodiments. Among them, the compressor is arranged on the heat exchange device body. The variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor arranged at the output of the rectifier bridge, and the electrolytic capacitor is connected in parallel with the compressor.

[0099] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned method for controlling a compressor of a heat exchange device.

[0100] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0101] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0102] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0103] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0104] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0105] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, 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 they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a compressor of a heat exchange device, characterized in that: The heat exchange device includes a variable frequency rectifier circuit and a compressor, wherein the variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor arranged at the output of the rectifier bridge, and the electrolytic capacitor is connected in parallel with the compressor; the method includes: Obtaining the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit; Determine the target command speed according to the capacitor voltage value; determining a target operating frequency of the compressor according to the target command speed; Control the compressor to operate according to the target operating frequency.

2. The method according to claim 1, characterized in that The capacitor voltage value includes the capacitor voltage difference and the capacitor voltage maximum value; Wherein, determining the target command speed according to the capacitor voltage value includes: The target command speed is determined based on the magnitude relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the magnitude relationship between the capacitor voltage maximum value and the capacitor voltage maximum threshold.

3. The method according to claim 2, characterized in that According to the magnitude relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the magnitude relationship between the capacitor voltage maximum value and the capacitor voltage maximum threshold, the target command speed is determined, including: When the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum value is less than or equal to the capacitor voltage maximum threshold, the current command speed is obtained; or, When the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the capacitor voltage maximum value is less than or equal to the capacitor voltage maximum threshold, the sampled total current in the variable frequency rectifier circuit and the exhaust temperature of the compressor are obtained; when the sampled total current is less than the current threshold, and the exhaust temperature of the compressor is less than the exhaust temperature threshold, the current command speed is obtained; The current command speed is used as the target command speed.

4. The method according to claim 2, characterized in that: According to the magnitude relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the magnitude relationship between the capacitor voltage maximum value and the capacitor voltage maximum threshold, the target command speed is determined, including: When the capacitor voltage difference is greater than the capacitor voltage difference threshold and the capacitor voltage maximum is greater than the capacitor voltage maximum threshold, the previous command speed is adjusted to obtain the target command speed.

5. The method according to claim 4, characterized in that Adjust the previous command speed as follows to obtain the target command speed: ωr * (n)=ωr * (n-1)-t×ωr * (n-1) Among them, ωr * (n) is the target command speed, ωr * (n-1) is the previous command speed, t is the adjustment coefficient, and n is the acquisition number of the command speed.

6. The method according to claim 2, characterized in that The capacitor voltage difference threshold is determined as follows: Get the current operating frequency of the compressor; When the current operating frequency of the compressor is equal to the first operating frequency threshold, obtaining a first voltage difference between a first maximum capacitor voltage value and a first minimum capacitor voltage value within a preset time period; Using the first voltage difference as a capacitor voltage difference threshold; and / or, The maximum capacitor voltage threshold is determined as follows: Get the current operating frequency of the compressor; When the current operating frequency of the compressor is equal to the first operating frequency threshold, obtaining a first maximum capacitor voltage value within a preset time period; The first maximum capacitor voltage value is used as the capacitor voltage maximum threshold.

7. The method according to any one of claims 1 to 6, characterized in that: Also includes: Before obtaining the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit, the current command speed is obtained; determining a current operating frequency of the compressor according to a current command speed; It is determined that the current operating frequency is greater than a second operating frequency threshold.

8. The method according to claim 7, characterized in that Also includes: When the current operating frequency is less than or equal to the second operating frequency threshold, taking the current operating frequency as the target operating frequency; Control the compressor to operate according to the target operating frequency.

9. A device for controlling a compressor of a heat exchange device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for controlling a compressor of a heat exchange device according to any one of claims 1 to 8 when running the program instructions.

10. A heat exchange device, characterized in that: include: Heat exchange equipment body; A compressor is arranged on the heat exchange device body; The variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor arranged at the output of the rectifier bridge, and the electrolytic capacitor is connected in parallel with the compressor; and, The device for controlling a compressor of a heat exchange device as claimed in claim 9 is installed on the heat exchange device body.

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