Method, device and heat exchanger for controlling a compressor of a heat exchanger

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for controlling a compressor of a heat exchange device. The heat exchange device comprises a variable-frequency rectification circuit and a compressor, wherein the variable-frequency rectification circuit comprises a rectification bridge and an electrolytic capacitor arranged at an output of the rectification bridge, and the electrolytic capacitor is connected in parallel with the compressor; the method comprises the following steps: obtaining a capacitor voltage value at two ends of the electrolytic capacitor in the variable-frequency rectification circuit; determining a target instruction speed according to the capacitor voltage value; determining a target operating frequency of the compressor according to the target instruction speed; and controlling the compressor to operate at the target operating frequency. The method timely adjusts the instruction speed according to the capacitor voltage variation trend at the two ends of the electrolytic capacitor, so that the instruction speed reaches the target instruction speed, the operating frequency of the compressor reaches the target operating frequency, and the refrigeration effect of the heat exchange device is improved. The application further discloses a device for controlling the compressor of the heat exchange device and a heat exchange device.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, for example to a method, apparatus and heat exchange equipment for controlling a compressor of a heat exchange equipment. Background Technology

[0002] During the hot summer months, some areas experience high temperatures, which increases the cooling demand on heat exchange equipment. This requires the compressors of the heat exchange equipment to provide stable cooling.

[0003] To improve the stability of compressor refrigeration, a method for controlling the compressor of a heat exchange device is disclosed in related technologies. The method includes: acquiring various temperatures required to determine initial demand; calculating the initial demand based on the acquired temperatures in response to the compressor's operating mode; determining the compressor's start-up frequency based on the initial demand; and starting the compressor. After starting the compressor, calculating the real-time demand based on the user-set temperature, determining the target operating frequency of the compressor based on the real-time demand, and adjusting the operating frequency of the variable frequency compressor.

[0004] In the process of implementing the embodiments of this disclosure, it was found that the related technology has at least the following problems: when the related technology is used for refrigeration in extremely high ambient temperatures, 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 unable to achieve stable refrigeration, thus leading to poor refrigeration stability of the heat exchange equipment.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a method, apparatus, and heat exchange equipment for controlling a compressor in a heat exchange equipment, which can improve the operational stability of the compressor in the refrigeration mode, thereby improving the refrigeration stability of the heat exchange equipment.

[0008] In some embodiments, 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 disposed 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 device includes: obtaining the capacitor voltage value across the electrolytic capacitor in the variable frequency rectifier circuit; determining a target command speed based on the capacitor voltage value; determining a target operating frequency of the compressor based on the target command speed; and controlling the compressor to operate at the target operating frequency.

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

[0010] Optionally, the target instruction speed is determined based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the maximum capacitor voltage and the maximum capacitor voltage threshold. This includes: obtaining the current instruction speed when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold; and using the current instruction speed as the target instruction 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 maximum capacitor voltage and the maximum capacitor voltage threshold. This includes: obtaining the total sampled current in the frequency converter circuit and the compressor exhaust temperature when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold; obtaining the current command speed when the total sampled current is less than the current threshold and the compressor exhaust temperature is less than the exhaust temperature threshold; and using the current command speed as the target command speed.

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

[0013] Optionally, the speed of the previous instruction can be adjusted as follows to obtain the target instruction speed:

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

[0015] Where, ωr *(n) represents the target command velocity, ωr * (n-1) represents 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 as follows: 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 period; using the first voltage difference as the capacitor voltage difference threshold; and / or, the capacitor voltage maximum threshold is determined as follows: 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 period; using the first maximum capacitor voltage value as the capacitor voltage maximum threshold.

[0017] Optionally, the method further includes: obtaining the current command speed before obtaining the capacitor voltage value across the electrolytic capacitor in the frequency converter circuit; determining the 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: if the current operating frequency is less than or equal to a second operating frequency threshold, using the current operating frequency as the target operating frequency; and controlling the compressor to operate at the target operating frequency.

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

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

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

[0022] By acquiring the voltage across the electrolytic capacitor in the variable frequency rectifier circuit, the trend of its voltage variation can be determined, thereby monitoring the changes in the actual current in the circuit and reflecting the compressor's operating frequency. Simultaneously, adjusting the command speed allows for precise adjustment of the compressor's operating frequency. Therefore, this method determines the target command speed based on the voltage variation trend across the electrolytic capacitor, and then adjusts the compressor's operating frequency accordingly to achieve the target frequency. Furthermore, controlling the compressor to operate at the target frequency also stabilizes the actual current in the variable frequency rectifier circuit, creating a positive feedback loop between the compressor's operating frequency and the actual current, mutually promoting each other's stability. Thus, this positive feedback control method improves the compressor's operational stability in refrigeration mode, thereby enhancing the overall refrigeration stability of the heat exchange equipment.

[0023] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0025] Figure 1 This is a schematic diagram of the structure of the frequency converter circuit in the heat exchange equipment provided in the embodiments of this disclosure;

[0026] Figure 2 This is a schematic diagram of a method for controlling a compressor of a heat exchange device according to an embodiment of this disclosure;

[0027] Figure 3 This is a schematic diagram of another method for controlling a compressor of a heat exchange device provided in an embodiment of this disclosure;

[0028] Figure 4 This is a schematic diagram of another method for controlling a compressor of a heat exchange device provided in an embodiment of this disclosure;

[0029] Figure 5 This is a schematic diagram of a device for controlling a compressor of a heat exchanger according to an embodiment of this disclosure;

[0030] Figure 6 This is a schematic diagram of a heat exchanger product provided in an embodiment of this disclosure. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

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

[0034] The term "and / or" describes an association 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" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0037] This 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). Wherein, as... Figure 1As shown, the variable frequency rectifier circuit 10 includes a power supply terminal 103, a rectifier bridge 101, and an electrolytic capacitor 102 disposed at the output of the rectifier bridge 101. The electrolytic capacitor 102 is connected in parallel with the compressor 20. The power supply terminal 103 is used to output alternating current (AC). The rectifier bridge 101 is used to convert the AC power into pulsating direct current (DC). The electrolytic capacitor 102 is used to convert the pulsating DC voltage into a relatively stable DC voltage and to filter out high-frequency and pulse interference in the pulsating DC voltage. 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 equipment. 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. The first terminal of the power supply terminal 103 is connected between the two diodes in the first rectifier branch 1021, and the second terminal of the power supply terminal 103 is connected between the two diodes in the second rectifier branch 1022. The rectifier bridge 101 converts the alternating current with a level fluctuating around zero into a unidirectional pulsating direct current by using the unidirectional conduction characteristic of the diode.

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

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

[0040] Optionally, the heat exchange equipment also includes a speed control system for adjusting the commanded speed.

[0041] In conjunction with the heat exchange equipment described above, this disclosure provides a method for controlling the compressor of the heat exchange equipment. For example... Figure 2 As shown, the method includes:

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

[0043] S202, the processor determines the target instruction speed based on the capacitor voltage value.

[0044] S203, the processor determines the target operating frequency of the compressor based on the target instruction speed.

[0045] S204, the processor controls the compressor to operate at the target operating frequency.

[0046] In this embodiment, by acquiring the capacitor voltage across the electrolytic capacitor in the variable frequency rectifier circuit, the trend of its voltage change can be determined, thereby monitoring the change in the actual current value in the variable frequency rectifier circuit and reflecting the change in the compressor's operating frequency. Simultaneously, the compressor's operating frequency can be precisely adjusted by regulating the command speed. Therefore, this method determines the target command speed by observing the voltage change trend across the electrolytic capacitor, and then adjusts the compressor's operating frequency to achieve the target operating frequency. Furthermore, by controlling the compressor to operate at the target operating frequency, the actual current value in the variable frequency rectifier circuit can be stabilized, thus creating a positive feedback loop between the compressor's operating frequency and the actual current value in the variable frequency rectifier circuit, mutually promoting each other's stability. In this way, through the aforementioned positive feedback control method, the operating stability of the compressor in the heat exchanger's cooling mode can be improved, thereby enhancing the cooling stability of the heat exchanger.

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

[0048] Optionally, the processor determines the target instruction speed based on the capacitor voltage value by: the processor determining the target instruction speed based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the maximum capacitor voltage and the maximum capacitor voltage threshold.

[0049] In this embodiment, the current condition in the frequency converter circuit can be determined by the capacitor voltage difference and the maximum capacitor voltage. The target command speed can then be determined based on the current condition in the frequency converter circuit to avoid excessive deviation in the current of the frequency converter circuit, thereby making the adjusted compressor operating frequency more accurate.

[0050] 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 maximum capacitor voltage and the maximum capacitor voltage threshold. This includes: the processor obtaining the current instruction speed when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold. The processor then uses the current instruction speed as the target instruction speed.

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

[0052] 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 maximum capacitor voltage and the maximum capacitor voltage threshold. This includes: when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold, and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold, the processor obtains the total sampled current in the inverter rectifier circuit and the compressor's exhaust temperature. When the total sampled current is less than a current threshold, and the compressor's exhaust temperature is less than an exhaust temperature threshold, the processor obtains the current instruction speed. The current instruction speed is then used as the target instruction speed.

[0053] For example, the current threshold is the upper limit current value specified for this model of heat exchanger. Different models of heat exchangers will have different ranges of current threshold values. For example, the exhaust temperature threshold is the upper limit exhaust temperature value specified for this model of heat exchanger. Different models of heat exchangers will have different ranges of exhaust temperature threshold values.

[0054] In this embodiment, based on the condition that the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold, the judgment condition that the total sampling current is less than the current threshold and the compressor exhaust temperature is less than the exhaust temperature threshold is introduced. This further comprehensively determines the situation of the variable frequency rectifier circuit, improves the accuracy of adjusting the target command speed, and thus makes 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, as well as the relationship between the maximum capacitor voltage and the maximum capacitor voltage threshold. This includes adjusting the previous instruction speed to obtain the target instruction speed when the capacitor voltage difference is greater than the capacitor voltage difference threshold and the maximum capacitor voltage is greater than the maximum capacitor voltage threshold.

[0056] In this embodiment, when the capacitor voltage difference is greater than the capacitor voltage difference threshold and the maximum capacitor voltage is greater than the maximum capacitor voltage threshold, it indicates that the current in the frequency converter circuit is large. In order to avoid the current deviation in the frequency converter circuit being too large, the speed of the previous command is adjusted, thereby adjusting the operating frequency of the compressor and preventing the compressor from stopping, so as to improve the cooling effect of the heat exchange equipment and improve the user experience.

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

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

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

[0060] For example, the time interval between the target instruction speed and the previous instruction 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 250ms (milliseconds).

[0061] For example, t is set to [0.1, 0.3]. Specifically, t is set to 0.2. By setting t to the above range, the speed of the previous instruction can be accurately adjusted, making the speed of the target instruction more accurate.

[0062] In this embodiment, by reducing the speed of the previous command, the target command speed is reduced compared to the previous command speed, thereby reducing the compressor's operating frequency and consequently reducing the current in the variable frequency rectifier circuit. This prevents excessive current deviation in the variable frequency rectifier circuit. Simultaneously, this algorithm can accurately obtain the target command speed, further controlling the compressor's operating frequency to remain within the target operating frequency range, thus improving the compressor's operational stability.

[0063] Optionally, the processor determines the capacitor voltage difference threshold as follows: The processor obtains the compressor operating frequency. When the compressor operating frequency equals a first operating frequency threshold, 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 period. The processor uses this first voltage difference as the capacitor voltage difference threshold.

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

[0065] For example, the processor determines the preset duration as follows: The processor obtains the mains power frequency. The processor calculates T1 = 1 / f × 2 to obtain the preset duration. Here, T1 is the preset duration, and f is the mains power frequency. Specifically, the preset duration is set to 40s or 33.33s.

[0066] In this embodiment, when the first preset frequency is set to 0Hz, it indicates that the compressor is in a stopped state. The capacitor voltage difference threshold obtained in this state reflects the voltage condition of the power supply, without fluctuations or interference. Therefore, the first difference between the maximum and minimum capacitor voltage values ​​when the compressor is stopped is used as the capacitor voltage difference threshold. The capacitor voltage difference is then compared and analyzed with the determined capacitor voltage difference threshold to make the analysis results more accurate and stable.

[0067] Optionally, the processor determines the maximum capacitor voltage threshold as follows: The processor obtains the compressor operating frequency. When the compressor operating frequency equals a first operating frequency threshold, the processor obtains a first maximum capacitor voltage value within a preset time period. The processor uses this first maximum capacitor voltage value as the maximum capacitor voltage threshold.

[0068] In this embodiment, when the first preset frequency is set to 0Hz, it indicates that the compressor is in a stopped state. The capacitor voltage difference threshold obtained in this state reflects the voltage condition of the power supply, without fluctuations 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 stopped is used as the capacitor voltage difference threshold. The capacitor voltage difference is then compared and analyzed with the determined capacitor voltage difference threshold, making the analysis results more accurate, stable, and interference-free.

[0069] Optionally, the processor obtains the capacitor voltage difference as follows: The processor obtains the compressor operating frequency. When the compressor operating frequency is greater than a 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 period. The processor uses this second voltage difference as the capacitor voltage difference. For example, the second operating frequency threshold is set to [50Hz, 60Hz]. The second operating frequency threshold represents a reference value for the compressor's operating frequency. When the operating frequency is greater than the second operating frequency threshold, it indicates that the compressor's operating frequency is relatively high.

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

[0071] Optionally, the processor obtains the maximum capacitor voltage as follows: the processor obtains the compressor operating frequency. When the compressor operating frequency is greater than a second operating frequency threshold, the processor obtains a 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 compressor operates at a high frequency, the second maximum capacitor voltage value is used as the maximum capacitor voltage value, making the adjusted target command speed more reasonable.

[0073] Optionally, the processor determines the compressor's target operating frequency based on the target instruction speed by calculating F = ωr / (2 × π × p) to obtain the compressor's target operating frequency. Here, F is the compressor's target operating frequency, and ωr...* Where P is the target command speed and P is the number of compressor pole pairs.

[0074] Optionally, after determining the target instruction speed, the method further includes: the processor inputting the target instruction speed to the speed control system to adjust the current instruction speed of the speed control system to the target instruction speed. This allows for automatic adjustment to correct the feedback instruction speed of the speed control system to the target instruction speed, providing accuracy and convenience.

[0075] like Figure 3 As shown in the embodiments of this disclosure, another method for controlling a compressor in a heat exchange device is provided. The method includes:

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

[0077] S302, the processor determines the current operating frequency of the compressor based on the current instruction speed.

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

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

[0080] S305, the processor determines the target instruction speed based on the capacitor voltage value.

[0081] S306, the processor determines the target operating frequency of the compressor based on the target instruction speed.

[0082] S307, the processor controls the compressor to operate at the target operating frequency.

[0083] In this embodiment, by comparing the compressor operating frequency with a second operating frequency threshold, it can be determined whether the compressor operating frequency is too high. If the compressor operating frequency is too high, the obtained capacitor voltage value allows for more accurate adjustment of the target command speed.

[0084] like Figure 4 As shown in the embodiments of this disclosure, another method for controlling a compressor in a heat exchange device is provided. The method includes:

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

[0086] S402, the processor determines the current operating frequency of the compressor based on the current instruction speed.

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

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

[0089] S405, the processor determines the target instruction speed based on the capacitor voltage value.

[0090] S406, the processor determines the target operating frequency of the compressor based on the target instruction speed.

[0091] S407: If the processor's current operating frequency is less than or equal to the second operating frequency threshold, the current operating frequency will be used 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 in the variable frequency rectifier circuit will not deviate excessively. Therefore, in this situation, the compressor can be controlled to operate at the current operating frequency without adjusting the compressor's operating frequency, further improving the stability of compressor operation.

[0094] Combination Figure 5 This disclosure provides an apparatus 200 for controlling a compressor in a heat exchange device, including a processor 500 and a memory 501. Optionally, the apparatus 200 for controlling the compressor in the heat exchange device may further include a communication interface 502 and a bus 503. The processor 500, communication interface 502, and memory 501 can communicate with each other via the bus 503. The communication interface 502 can be used for information transmission. The processor 500 can call logical instructions in the memory 501 to execute the method for controlling the compressor in the heat exchange device described in the above embodiment.

[0095] Furthermore, the logic instructions in the aforementioned memory 501 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0096] The memory 501, as a storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 500 executes functional applications and data processing by running the program instructions / modules stored in the memory 501, that is, it implements the method for controlling the compressor of the heat exchange equipment in the above embodiments.

[0097] The memory 501 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 501 may include high-speed random access memory and may also include non-volatile memory.

[0098] Combination Figure 6 As shown, this 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 as described above. The installation relationship described herein is not limited to placement within 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. Those skilled in the art will understand that the device 200 for controlling the compressor can be adapted to any feasible heat exchange device body 10, thereby realizing other feasible embodiments. The compressor is disposed within the heat exchange device body. The variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor disposed at the output of the rectifier bridge, the electrolytic capacitor being connected in parallel with the compressor.

[0099] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling a compressor in a heat exchange device.

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

[0101] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0102] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0103] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

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

[0105] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a compressor in a heat exchange device, characterized in that, The heat exchange equipment includes a variable frequency rectifier circuit and a compressor. The variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor located at the output of the rectifier bridge. The electrolytic capacitor is connected in parallel with the compressor. The method includes: Obtain the capacitor voltage value across the electrolytic capacitor in the frequency converter rectifier circuit. The capacitor voltage value includes the capacitor voltage difference and the maximum capacitor voltage. Determining the target command speed based on capacitor voltage values ​​includes: determining the target command speed based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the maximum capacitor voltage and the maximum capacitor voltage threshold; determining the target command speed based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the maximum capacitor voltage and the maximum capacitor voltage threshold, including: obtaining the current command speed when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold; or, obtaining the total sampling current in the frequency converter rectifier circuit and the compressor exhaust temperature when the capacitor voltage difference is less than or equal to the capacitor voltage difference threshold and the maximum capacitor voltage is less than or equal to the maximum capacitor voltage threshold; obtaining the current command speed when the total sampling current is less than the current threshold and the compressor exhaust temperature is less than the exhaust temperature threshold; and using the current command speed as the target command speed. Determine the target operating frequency of the compressor based on the target command speed; Control the compressor to operate at the target operating frequency.

2. The method according to claim 1, characterized in that, Based on the relationship between the capacitor voltage difference and the capacitor voltage difference threshold, and the relationship between the maximum capacitor voltage and the maximum capacitor voltage threshold, the target command speed is determined, including: If the capacitor voltage difference is greater than the capacitor voltage difference threshold and the maximum capacitor voltage is greater than the maximum capacitor voltage threshold, adjust the previous instruction speed to obtain the target instruction speed.

3. The method according to claim 2, characterized in that, Adjust the speed of the previous instruction as follows to obtain the target instruction speed: = -t× in, For the target command speed, t is the speed of the previous command, t is the adjustment coefficient, and n is the acquisition number of the command speed.

4. The method according to claim 1, characterized in that, The capacitor voltage difference threshold shall be determined as follows: Obtain the current operating frequency of the compressor; When the compressor’s current operating frequency is equal to the first operating frequency threshold, the first voltage difference between the first maximum capacitor voltage value and the first minimum capacitor voltage value within a preset time period is obtained. The first voltage difference is used as the capacitor voltage difference threshold. And / or, The maximum threshold voltage of the capacitor is determined as follows: Obtain the current operating frequency of the compressor; When the compressor’s current operating frequency is equal to the first operating frequency threshold, the first maximum capacitor voltage value within a preset time period is obtained; The first maximum capacitor voltage value is used as the maximum capacitor voltage threshold.

5. The method according to any one of claims 1 to 4, characterized in that, Also includes: Before obtaining the capacitor voltage across the electrolytic capacitor in the frequency converter rectifier circuit, obtain the current command speed; The current operating frequency of the compressor is determined based on the current command speed; Determine that the current operating frequency is greater than the second operating frequency threshold.

6. The method according to claim 5, characterized in that, Also includes: If the current operating frequency is less than or equal to the second operating frequency threshold, the current operating frequency shall be used as the target operating frequency. Control the compressor to operate at the target operating frequency.

7. An apparatus 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, when executing the program instructions, perform the method for controlling a compressor of a heat exchange device as described in any one of claims 1 to 6.

8. A heat exchange device, characterized in that, include: The heat exchanger body; The compressor is located within the heat exchanger body; The variable frequency rectifier circuit includes a rectifier bridge and an electrolytic capacitor located at the output of the rectifier bridge. The electrolytic capacitor is connected in parallel with the compressor. and, The device for controlling the compressor of a heat exchanger as described in claim 7 is installed on the heat exchanger body.

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