Control system, method, device, compressor, refrigeration apparatus and storage medium for a compressor

Abstract

The application provides a compressor control system, method and device, a compressor, a refrigeration equipment and a storage medium. The compressor control system comprises a signal acquisition device adapted to acquire a phase current signal of a compressor body; a first protection device in communication connection with the signal acquisition device and adapted to receive the phase current signal from the signal acquisition device and perform first-order protection on the compressor body according to the phase current signal; and a second protection device in communication connection with the signal acquisition device and adapted to receive the phase current signal from the signal acquisition device and perform second-order protection on the compressor body according to the phase current signal. The technical scheme of the application can avoid unnecessary shutdown and restart of the compressor and improve the stability and working efficiency of the compressor operation.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to compressor control systems, methods, apparatus, compressors, refrigeration equipment, and storage media. Background Technology

[0002] In related technologies, compressor overcurrent protection mainly employs a single-threshold overcurrent protection mechanism. When the compressor's operating current exceeds a set threshold, the compressor will shut down under overcurrent protection. However, since many situations can cause compressor overcurrent, not all situations actually require the compressor to execute shutdown protection. The single-threshold overcurrent protection mechanism in related technologies can cause unnecessary compressor shutdowns and restarts, reducing the compressor's operational stability and efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the above-mentioned technical problems.

[0004] Therefore, the first objective of the present invention is to provide a control system for a compressor.

[0005] A second objective of this invention is to provide a method for controlling a compressor.

[0006] A third objective of this invention is to provide a compressor.

[0007] The fourth objective of this invention is to provide a refrigeration device.

[0008] The fifth objective of this invention is to provide a control device for a compressor.

[0009] The sixth objective of this invention is to provide a computer-readable storage medium.

[0010] To achieve the first objective of this invention, this invention provides a compressor control system, comprising: a signal acquisition device adapted to acquire a phase current signal of the compressor body; a first protection device communicatively connected to the signal acquisition device, adapted to receive the phase current signal from the signal acquisition device and perform first-order protection on the compressor body based on the phase current signal; and a second protection device communicatively connected to the signal acquisition device, adapted to receive the phase current signal from the signal acquisition device and perform second-order protection on the compressor body based on the phase current signal.

[0011] This implementation provides first-stage and second-stage protection for the compressor body based on the acquired phase current signal, using a first protection device and a second protection device. Specifically, the first protection device provides first-stage protection by shutting down the compressor body in case of a short circuit or stall. The second protection device provides second-stage protection by shutting down the compressor body as needed in case of excessively low compressor speed or excessive load. This two-stage protection mechanism effectively protects the compressor body while preventing unnecessary shutdowns and restarts. This improves the compressor's stability and efficiency during operation and extends its service life.

[0012] In addition, the technical solutions provided by the above embodiments of the present invention may also have the following additional technical features:

[0013] In the above technical solution, the signal acquisition device includes: a signal acquisition device, which is communicatively connected to the compressor body and is suitable for acquiring the phase current of the compressor body; and a signal amplification device, which is communicatively connected to the signal acquisition device and is suitable for converting the phase current from the signal acquisition device into a phase current signal.

[0014] For example, a signal acquisition device using a sampling resistor can acquire phase current, and a signal amplification device using an operational amplifier circuit can amplify the acquired phase current to obtain the phase current signal. Through these signal acquisition and amplification devices, the phase current signal can be acquired promptly and accurately, facilitating the implementation of first-order and second-order protection by the first and second protection devices based on the phase current signal.

[0015] In any of the above technical solutions, the first protection device includes: a first instantaneous current protection threshold adjustment device, adapted to determine a first instantaneous current protection threshold of the first protection device according to the rated current of the compressor body; and a first comparison device, adapted to receive a phase current signal from a signal acquisition device, compare the phase current signal with the first instantaneous current protection threshold, and perform first-order protection on the compressor body according to the comparison result.

[0016] In this embodiment, the first instantaneous current protection threshold adjustment device determines the magnitude of the first instantaneous current protection threshold based on the rated current of the compressor body. Then, the first comparison device compares the phase current signal with the first instantaneous current protection threshold. The magnitude of the phase current signal indicates whether the compressor body is in a normal operating state. For example, if the phase current signal is too large, it indicates that the compressor body may have a short circuit or stall problem. Therefore, by determining whether the phase current signal exceeds the first instantaneous current protection threshold, this embodiment can determine whether the compressor body is operating normally, thereby promptly detecting compressor body operational abnormalities such as short circuits or stalls, and providing timely first-order protection for the compressor body.

[0017] In any of the above technical solutions, the second protection device includes: a phase current signal conversion device, adapted to receive a phase current signal from a signal acquisition device and convert the phase current signal into a valid phase current signal; and a second comparison device, adapted to receive the valid phase current signal from the phase current signal conversion device, compare the valid phase current signal with at least one of a second instantaneous current protection threshold and a third instantaneous current protection threshold, and perform second-order protection on the compressor body based on the comparison result.

[0018] In this embodiment, the phase current signal is converted into an effective phase current signal by a phase current signal conversion device. Then, a second comparison device compares the effective phase current signal with at least one of a second instantaneous current protection threshold and a third instantaneous current protection threshold. Therefore, during the second-order protection process, based on the relationship between the effective phase current signal and the second and third instantaneous current protection thresholds, it is possible to accurately determine whether the compressor body has abnormal conditions such as excessively low speed or excessive load, so as to promptly perform second-order protection on the compressor body.

[0019] In any of the above technical solutions, the compressor control system further includes: a drive device adapted to conduct or disconnect the phase current in the compressor body; wherein the first protection device and the second protection device are respectively communicatively connected to the drive device to control the drive device to conduct or disconnect the phase current.

[0020] By controlling the drive device through the first and second protection devices to turn the phase current on or off, the phase current can be cut off in a timely manner when it is necessary to protect the compressor body, so as to effectively protect the compressor body.

[0021] To achieve the second objective of this invention, this invention provides a compressor control method, comprising: acquiring a phase current signal of the compressor body; performing first-order protection on the compressor body based on the phase current signal; and performing second-order protection on the compressor body based on the phase current signal.

[0022] This embodiment acquires the phase current signal of the compressor body and performs first-order and / or second-order protection based on the phase current signal to avoid the problem of frequent shutdown and restart caused by applying a single threshold protection to the compressor body, thereby improving the stability and efficiency of the compressor body operation and thus extending the service life of the compressor.

[0023] In the above technical solution, the first-order protection of the compressor body based on the phase current signal specifically includes: determining the first instantaneous current protection threshold based on the rated current of the compressor body; comparing the phase current signal with the first instantaneous current protection threshold; and performing first-order protection of the compressor body based on the comparison result.

[0024] In this embodiment, a first instantaneous current protection threshold is determined based on the rated current, and then compared with the phase current signal to activate the necessary first-order protection according to the comparison result. The calculation and comparison method is simple, reliable, and easy to implement.

[0025] In any of the above technical solutions, the first-order protection of the compressor body based on the comparison result specifically includes: determining that the phase current signal is less than or equal to the first instantaneous current protection threshold, and controlling the phase current in the compressor body to be turned on; or determining that the phase current signal is greater than the first instantaneous current protection threshold, and controlling the phase current in the compressor body to be turned off.

[0026] By comparing the magnitude of the first instantaneous current protection threshold with the phase current signal, compressor malfunctions such as stalled rotor and short circuit can be effectively identified. When the phase current signal is less than or equal to the first instantaneous current protection threshold, it indicates that the compressor is not experiencing stalled rotor or short circuit malfunctions, and shutdown protection is not required at this time. When the phase current signal is greater than the first instantaneous current protection threshold, it indicates that the compressor is currently experiencing stalled rotor or short circuit malfunctions. In this case, it is necessary to disconnect the phase current in the compressor to immediately execute shutdown protection and prevent compressor damage.

[0027] In any of the above technical solutions, the second-order protection of the compressor body based on the phase current signal specifically includes: converting the phase current signal into an effective phase current signal; comparing the effective phase current signal with at least one of the second instantaneous current protection threshold and the third instantaneous current protection threshold; and performing second-order protection on the compressor body based on the comparison result.

[0028] By comparing the first instantaneous current protection threshold and the second instantaneous current protection threshold with the phase current signal, abnormal problems such as excessively low compressor speed or excessive load can be quickly and efficiently identified. Therefore, it is convenient to determine whether to perform second-order protection on the compressor body based on the comparison results.

[0029] In any of the above technical solutions, the second-order protection of the compressor body based on the comparison result specifically includes: determining that the effective phase current signal is less than the third instantaneous current protection threshold, and controlling the phase current in the compressor body to be turned on; or determining that the effective phase current signal is greater than the second instantaneous current protection threshold, and controlling the phase current in the compressor body to be turned off.

[0030] In this embodiment, when the effective phase current signal is less than the third instantaneous current protection threshold, it indicates that the compressor body is in normal operating condition; when the effective phase current signal is greater than the second instantaneous current protection threshold, it indicates that the compressor body is in abnormal operating condition. By comparing the third and second instantaneous current protection thresholds with the phase current signal, abnormal problems such as excessively low compressor speed or excessive load can be accurately determined, so as to further avoid unnecessary shutdowns on the basis of timely overcurrent protection of the compressor body.

[0031] In any of the above technical solutions, the second-order protection of the compressor body based on the comparison result specifically includes: determining that the effective phase current signal is greater than or equal to the third instantaneous current protection threshold and less than or equal to the second instantaneous current protection threshold; integrating and accumulating the effective phase current signal within the integration time range to obtain the integration accumulation result; and performing second-order protection of the compressor body based on the integration accumulation result; wherein, the integration time range is the time range within which the effective phase current signal is maintained within the third instantaneous current protection threshold and the second instantaneous current protection threshold.

[0032] In this embodiment, when the effective phase current signal is greater than or equal to the third instantaneous current protection threshold and less than or equal to the second instantaneous current protection threshold, the method of protection is determined based on the integral accumulation value of the effective phase current signal falling within the range of the third and second instantaneous current protection thresholds. This accurately determines the required protection mode, effectively protecting the compressor body while avoiding unnecessary shutdowns.

[0033] In any of the above technical solutions, the second-order protection of the compressor body based on the integral accumulation result specifically includes: determining that the integral accumulation result is less than the integral accumulation result threshold, and controlling the phase current in the compressor body to conduct; or determining that the integral accumulation result is greater than or equal to the integral accumulation result threshold, and controlling the phase current in the compressor body to disconnect.

[0034] In this embodiment, if the integral accumulation result is less than the integral accumulation result threshold, the compressor body continues to operate; if the integral accumulation result is greater than or equal to the integral accumulation result threshold, the compressor body is shut down for protection. This is to avoid unnecessary shutdowns and improve the operating efficiency of the compressor body.

[0035] In any of the above technical solutions, the third instantaneous current protection threshold is less than the second instantaneous current protection threshold, and the second instantaneous current protection threshold is less than the first instantaneous current protection threshold.

[0036] The first, second, and third instantaneous current protection thresholds decrease sequentially. The first instantaneous current protection threshold is a hardware overcurrent protection threshold, set to its maximum. It enables rapid hardware response to prevent the inverter controller from burning out when abnormally high current occurs due to compressor stall, two-phase short circuit, or other reasons, thus protecting the compressor. The second instantaneous current protection threshold is a software overcurrent protection threshold, set within the range of the first threshold. This additional software filtering protection within the hardware protection range is more effective, preventing damage to the inverter controller and compressor from high-current operation when the compressor operates at low speeds and excessive loads, even if overpower protection cannot be triggered. The third instantaneous current protection threshold is the compressor motor overheat protection current threshold, preventing overheating of the motor due to prolonged compressor overload operation. Therefore, by combining hardware and software protection with overheat protection for the compressor itself, a multi-layered protection structure or method is formed, avoiding incomplete or excessive protection from a single protection method.

[0037] To achieve the third objective of this invention, this invention provides a compressor, comprising: a compressor body; and a compressor control system as described in any embodiment of this invention, communicatively connected to the compressor body to control the conduction or disconnection of phase current in the compressor body.

[0038] The compressor of the present invention includes the control system of the compressor of any embodiment of the present invention, and thus has all the beneficial effects of the control system of the compressor of any embodiment of the present invention, which will not be repeated here.

[0039] To achieve the fourth objective of this invention, this invention provides a refrigeration device, comprising: a refrigerant circulation pipeline containing refrigerant; a compressor adapted to compress the refrigerant; wherein the compressor includes a compressor body and a compressor control system as described in any embodiment of this invention, the compressor control system being communicatively connected to the compressor body to control the conduction or disconnection of phase current in the compressor body.

[0040] The refrigeration equipment of the present invention includes a compressor control system as described in any embodiment of the present invention, and thus has all the beneficial effects of the compressor control system as described in any embodiment of the present invention, which will not be repeated here.

[0041] To achieve the fifth objective of this invention, this invention provides a compressor control device, comprising: a memory storing a computer program; and a processor executing the computer program; wherein, when the processor executes the computer program, it implements the steps of the compressor control method as described in any embodiment of this invention.

[0042] The compressor control device of the present invention implements the steps of the compressor control method of any embodiment of the present invention, and therefore has all the beneficial effects of the compressor control method of any embodiment of the present invention, which will not be repeated here.

[0043] To achieve the sixth objective of this invention, this invention provides a computer-readable storage medium, comprising: a computer-readable storage medium storing a computer program, wherein when the computer program is executed, it implements the steps of a compressor control method as described in any embodiment of this invention.

[0044] The computer-readable storage medium of this invention implements the steps of the compressor control method of any embodiment of this invention, and therefore has all the beneficial effects of the compressor control method of any embodiment of this invention, which will not be repeated here.

[0045] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0047] Figure 1 This is a schematic diagram of the first system composition of the compressor control system according to some embodiments of the present invention;

[0048] Figure 2 This is a schematic diagram of the system composition of a signal acquisition device according to some embodiments of the present invention;

[0049] Figure 3 This is a schematic diagram of the system composition of the first protection device according to some embodiments of the present invention;

[0050] Figure 4 This is a schematic diagram of the system composition of the second protection device according to some embodiments of the present invention;

[0051] Figure 5 This is a schematic diagram of the second system composition of the compressor control system according to some embodiments of the present invention;

[0052] Figure 6 This is a flowchart of the first step of the compressor control method according to some embodiments of the present invention;

[0053] Figure 7 This is a schematic diagram of the system composition of the compressor according to some embodiments of the present invention;

[0054] Figure 8 This is a schematic diagram of the system composition of a refrigeration device according to some embodiments of the present invention;

[0055] Figure 9This is a schematic diagram of the system composition of the compressor control device according to some embodiments of the present invention;

[0056] Figure 10 This is a flowchart of the second step of the compressor control method according to some embodiments of the present invention.

[0057] in, Figures 1 to 10 The correspondence between the markings and the part names is as follows:

[0058] 100: Compressor control system; 110: Signal acquisition device; 112: Signal acquisition device; 114: Signal amplification device; 120: First protection device; 122: First instantaneous current protection threshold adjustment device; 124: First comparison device; 130: Second protection device; 132: Phase current signal conversion device; 134: Second comparison device; 140: Drive device; 200: Compressor; 210: Compressor body; 300: Refrigeration equipment; 310: Refrigerant circulation management; 400: Compressor control device; 410: Memory; 420: Processor. Detailed Implementation

[0059] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0060] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0061] The following reference Figures 1 to 10 The technical solutions of some embodiments of the present invention are described below.

[0062] Example 1:

[0063] like Figure 1 As shown, this embodiment provides a compressor control system 100, including: a signal acquisition device 110, a first protection device 120, and a second protection device 130, wherein the signal acquisition device 110 is adapted to acquire the phase current signal I of the compressor body 210. s The first protection device 120 is communicatively connected to the signal acquisition device 110 and is adapted to receive the phase current signal I from the signal acquisition device 110. s And based on the phase current signal I s The compressor body 210 is provided with first-order protection. The second protection device 130 is communicatively connected to the signal acquisition device 110 and is adapted to receive the phase current signal I from the signal acquisition device 110.s And based on the phase current signal I s The compressor body 210 is protected by a second-order protection.

[0064] In practical applications, many situations can trigger the compressor body 210's overcurrent protection, such as the inrush current during startup, sudden load changes during compressor operation, rapid speed increases or decreases in the compressor body 210's speed, motor stall, and two-phase short circuits or grounding. However, in reality, rapid shutdown of the compressor body 210 is only necessary when encountering faults with excessive current, such as motor stall or short circuits. Shutdowns and restarts during startup inrush current, sudden load changes, or speed increases / decreases are often unnecessary. Such unnecessary shutdowns reduce the compressor body 210's operating efficiency and stability, and shorten its service life. To avoid unnecessary shutdowns of the compressor body 210, this embodiment employs a first protection device 120 and a second protection device 130 to provide two-stage protection for the compressor body 210.

[0065] Specifically, the first protection device 120 provides necessary shutdown protection for the compressor body 210 in the event of a short circuit or stall in the compressor body by implementing first-stage protection. The second protection device 130 provides necessary shutdown protection for the compressor body 210 as needed by implementing second-stage protection when the compressor body 210 experiences excessively low speed or excessive load.

[0066] The two-stage protection mechanism effectively protects the compressor body 210 while preventing unnecessary shutdowns and restarts. This improves the stability and efficiency of the compressor body 210 during operation and extends its service life.

[0067] Example 2:

[0068] like Figure 2 As shown, in addition to the technical features of Embodiment 1 described above, this embodiment further includes the following technical features:

[0069] The signal acquisition device 110 includes a signal acquisition device 112 and a signal amplification device 114. The signal acquisition device 112 is communicatively connected to the compressor body 210 and is adapted to acquire the phase current I of the compressor body 210. The signal amplification device 114 is communicatively connected to the signal acquisition device 112 and is adapted to convert the phase current I from the signal acquisition device 112 into a phase current signal Ip. s .

[0070] In this embodiment, the signal acquisition device 112 can be a sampling resistor, and the signal amplification device 114 can be an operational amplifier circuit. For the variable frequency compressor, the signal acquisition device 110 can be composed of a sampling resistor and an operational amplifier circuit connected in series in the lower bridge of the three-phase output of the variable frequency controller of the variable frequency compressor. The phase current I is acquired through the sampling resistor, and then the phase current I is amplified by the operational amplifier circuit to convert it into a phase current signal I. s For phase current signal I s Analysis and processing.

[0071] Through the signal acquisition device 112 and the signal amplification device 114, the phase current signal I can be collected in a timely and accurate manner. s This allows the first protection device 120 and the second protection device 130 to acquire the phase current signal I, thereby facilitating their operation. s Implement first-order and second-order protection.

[0072] Example 3:

[0073] like Figure 3 As shown, in addition to the technical features of any of the above embodiments, this embodiment further includes the following technical features:

[0074] The first protection device 120 includes: a first instantaneous current protection threshold adjustment device 122 and a first comparison device 124, wherein the first instantaneous current protection threshold adjustment device 122 is adapted to adjust the rated current I of the compressor body 210 according to the current I. 额 Determine the first instantaneous current protection threshold I of the first protection device 120. a The first comparison device 124 is adapted to receive the phase current signal I from the signal acquisition device 110. s The phase current signal I s With the first instantaneous current protection threshold I a A size comparison is performed, and first-order protection is applied to the compressor body 210 based on the comparison results.

[0075] In this embodiment, the first comparison device 124 can be a voltage comparator, and the first instantaneous current protection threshold adjustment device 122 can be a voltage divider circuit. In other words, the first protection device 120 is a hardware overcurrent protection module, which can be composed of a voltage comparator and a voltage divider circuit. The voltage divider circuit adjusts the first instantaneous current protection threshold I. a Adjust to I a =a×I 额 Among them, if it is for a variable frequency compressor, I 额 This is the rated current of the variable frequency compressor refrigeration system. The value of 'a' can be selected and adjusted by those skilled in the art based on the actual situation.

[0076] In this embodiment, the signal acquisition device 110 acquires the phase current I from the input terminal of the compressor body 210, and converts the acquired phase current I into a phase current signal I. s The phase current signal I s They are transmitted separately, with one transmission direction being the phase current signal I. s The signal is transmitted to the first protection device 120. When the first protection device 120 receives the phase current signal I... s After comparison by the first comparison device 124, I s with I a The size of I s Greater than I a If the first protection device 120 generates a control level, it shuts off the three-phase output of the compressor body 210; if the first protection device 120 receives the phase current signal I... s Less than or equal to I a Then the compressor body 210 will output three phases so that the compressor body 210 will continue to operate.

[0077] In this embodiment, the first instantaneous current protection threshold I a The hardware overcurrent protection threshold can enable the first protection device 120 to respond quickly and activate protection when the current is abnormally high due to reasons such as compressor stall or two-phase short circuit, effectively preventing the compressor body 210 from burning out, thereby protecting the compressor body 210.

[0078] Example 4:

[0079] like Figure 4 As shown, in addition to the technical features of any of the above embodiments, this embodiment further includes the following technical features:

[0080] The second protection device 130 includes: a phase current signal conversion device 132 and a second comparison device 134, wherein the phase current signal conversion device 132 is adapted to receive the phase current signal I from the signal acquisition device 110. s The phase current signal I s Converted to effective phase current signal I rms The second comparison device 134 is adapted to receive the effective phase current signal I from the phase current signal conversion device 132. rms The effective phase current signal I rms With the second instantaneous current protection threshold I b and the third instantaneous current protection threshold I c At least one of them is compared in size, and second-order protection is applied to the compressor body 210 based on the comparison result.

[0081] The second protection device 130 is an adaptive overcurrent protection module, which can be composed of a microcontroller unit (MCU) main control chip. As an adaptive overcurrent protection module, the second protection device 130 sets two effective current protection thresholds by programming the main control chip, namely the second instantaneous current protection threshold I. b and the third instantaneous current protection threshold I c .

[0082] Among them, the second instantaneous current protection threshold I b With rated current I 额 The following relationship exists between them: I b = b × In. Third instantaneous current protection threshold I c With rated current I 额 The following relationship exists between them: I c = c × In. The values ​​of b and c can be selected and adjusted by those skilled in the art according to the actual situation. Among them, the value a is greater than b, and the value b is greater than c.

[0083] Among them, the second instantaneous current protection threshold I b This is the software overcurrent protection threshold. Its function is to prevent the software overcurrent protection from being triggered when the compressor is operating at low speed and under excessive load, in cases where the overpower protection cannot be triggered. This prevents damage to the compressor body 210 under high current operation and avoids frequent shutdowns of the compressor body 210 due to unnecessary reasons. Third instantaneous current protection threshold I c It is the overheat protection current threshold of the compressor motor, which is used to prevent the motor from overheating due to prolonged overload operation of the compressor body 210.

[0084] The acquisition device 110 collects the phase current I from the input terminal of the compressor body 210, and the signal acquisition device 110 converts the collected phase current I into a phase current signal I. s The phase current signal I s The signal is transmitted to the second protection device 130, which acts as an adaptive overcurrent protection module, and transmits the received phase current signal I. s Converted into effective phase current signal I rms If the effective phase current signal I rms Greater than the second instantaneous current protection threshold I b Then, the three-phase output of the compressor body 210 is shut off. When the effective phase current signal I... rms Less than the third instantaneous current protection threshold I c Then the compressor body 210 will continue to operate normally.

[0085] Example 5:

[0086] like Figure 5 As shown, in addition to the technical features of any of the above embodiments, this embodiment further includes the following technical features:

[0087] The compressor control system 100 further includes a drive device 140, which is adapted to turn on or off the phase current I in the compressor body 210; wherein the first protection device 120 and the second protection device 130 are respectively communicatively connected to the drive device 140 to control the drive device 140 to turn on or off the phase current I.

[0088] In this embodiment, the driving device 140 may consist of a pre-driver chip, an insulated gate bipolar transistor (IGBT), and an inverter circuit. The IGBT may be a composite fully controllable voltage-driven power semiconductor device composed of a bipolar transistor and an insulated gate field-effect transistor.

[0089] By controlling the drive device 140 through the first protection device 120 and the second protection device 130, the phase current I in the compressor body 210 can be quickly turned on or off, so as to achieve precise control and effectively protect the compressor body 210.

[0090] Example 6:

[0091] like Figure 6 As shown, this embodiment provides a compressor control method, including:

[0092] S102: Obtain the phase current signal I of the compressor body 210 s ;

[0093] S104: Based on the phase current signal I s First-order protection is applied to the compressor body 210;

[0094] S106: Based on the phase current signal I s The compressor body 210 is protected by a second-order protection.

[0095] This embodiment obtains the phase current signal I of the compressor body 210. s For phase current signal I s After analysis and processing, the system selects between first-order protection and second-order protection based on the specific circumstances or steps. This allows for different overcurrent protection measures to be implemented for different situations that cause overcurrent in the compressor body 210, avoiding unnecessary overcurrent protection caused by a single shutdown and restart protection measure for the compressor body 210. This improves the stability and efficiency of the compressor body 210's operation and extends its service life.

[0096] Example 7:

[0097] In addition to the technical features of Embodiment 6 described above, this embodiment further includes the following technical features:

[0098] Based on the phase current signal I s The first-order protection of the compressor body 210 specifically includes: based on the rated current I of the compressor body 210 额 Determine the first instantaneous current protection threshold I. a ; Phase current signal I s With the first instantaneous current protection threshold I a Perform a size comparison; based on the comparison results, perform first-order protection on the compressor body 210.

[0099] The first instantaneous current protection threshold I in this embodiment a With rated current I 额 The following relationship exists between them: I a =a×I 额 The value of 'a' can be selected and adjusted by those skilled in the art based on the actual situation.

[0100] Example 8:

[0101] In addition to the technical features of Embodiment 7 described above, this embodiment further includes the following technical features:

[0102] Based on the comparison results, the compressor body 210 is subjected to first-order protection, specifically including: determining the phase current signal I. s Less than or equal to the first instantaneous current protection threshold I a The phase current I in the compressor body 210 is controlled to conduct; or the phase current signal I is determined. s Greater than the first instantaneous current protection threshold I a The phase current I in the compressor body 210 is disconnected.

[0103] By comparing the first instantaneous current protection threshold I a With phase current signal I s The magnitude of the signal can effectively identify abnormal operating conditions of the compressor body 210, such as stalled rotor and short circuit. Specifically, when the phase current signal I... s Less than or equal to the first instantaneous current protection threshold I a This indicates that the compressor body 210 has not experienced any abnormalities such as stall or short circuit, and in this case, it is not necessary to implement shutdown protection. When the phase current signal I... s Greater than the first instantaneous current protection threshold I a If this occurs, it indicates that the compressor body 210 is experiencing a stall or short circuit abnormality. In this case, it is necessary to disconnect the phase current in the compressor body 210 to immediately execute the shutdown protection and avoid damage to the compressor.

[0104] Example 9:

[0105] In addition to the technical features of any of the above embodiments, this embodiment further includes the following technical features:

[0106] Based on the phase current signal I s The second-order protection of the compressor body 210 specifically includes: transferring the phase current signal I... s Converted to effective phase current signal I rms ; The effective phase current signal I rms With the second instantaneous current protection threshold I b and the third instantaneous current protection threshold I c At least one of them is compared in size; based on the comparison result, the compressor body 210 is subjected to second-order protection.

[0107] The second instantaneous current protection threshold I is passed. b and the third instantaneous current protection threshold I c respectively with phase current signal I s The comparative technical solution can quickly and accurately determine the operating status of the compressor body 210 and perform second-level protection based on the actual operating condition of the compressor body 210.

[0108] Example 10:

[0109] In addition to the technical features of Embodiment 9 described above, this embodiment further includes the following technical features:

[0110] Based on the comparison results, the compressor body 210 is subjected to second-order protection, specifically including: determining the effective phase current signal I. rms Less than the third instantaneous current protection threshold I c The phase current I in the compressor body 210 is turned on; or a valid phase current signal I is determined. rms Greater than the second instantaneous current protection threshold I b The phase current I in the compressor body 210 is disconnected.

[0111] In other words, this embodiment will receive the phase current signal I. s Converted into effective phase current signal I rms If the effective phase current signal I rms Greater than the second instantaneous current protection threshold I b If the compressor body 210 is shut down, the three-phase output will be cut off for shutdown protection. When the effective phase current signal I... rms Less than the third instantaneous current protection threshold I c Then the compressor body 210 will continue to operate normally.

[0112] Example 11:

[0113] In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0114] Based on the comparison results, the compressor body 210 is subjected to second-order protection, specifically including: determining the effective phase current signal I. rms Greater than or equal to the third instantaneous current protection threshold I c And less than or equal to the second instantaneous current protection threshold I b For the effective phase current signal I within the integration time range t rms Perform integration and obtain the integration result ∫I. rms Based on the cumulative integral result ∫I rms Second-order protection is applied to the compressor body 210; wherein, the integration time range t is the effective phase current signal I. rms Maintain at the third instantaneous current protection threshold I c Second instantaneous current protection threshold I b Within the specified time range.

[0115] In this embodiment, if the effective phase current signal I rms Greater than or equal to the third instantaneous current protection threshold I c And less than or equal to the second instantaneous current protection threshold I b Then, in the effective phase current signal I rms Maintain at a level greater than or equal to the third instantaneous current protection threshold I c And less than or equal to the second instantaneous current protection threshold I b The effective phase current signal I within the integration time range t of this interval rms Integrating and accumulating the data. Specifically, when the effective phase current signal I... rms Exceeding the third instantaneous current protection threshold I c And less than or equal to the second instantaneous current protection threshold I b Within this range, the integration time range t is zeroed out. Therefore, based on the real-time calculated integration accumulation result ∫I rms The compressor body 210 is protected by a second-order protection.

[0116] Example 12:

[0117] In addition to the technical features of Embodiment 11 described above, this embodiment further includes the following technical features:

[0118] Based on the cumulative integral result ∫I rms The second-order protection of the compressor body 210 specifically includes: determining the integral accumulation result ∫I rms Less than the threshold of the integral accumulation result ∫I rms阈The phase current I in the compressor body 210 is controlled to conduct; or the integral accumulation result ∫I is determined. rms Greater than or equal to the threshold ∫I of the integral accumulation result rms阈 The phase current I in the compressor body 210 is disconnected.

[0119] In other words, the result of the integral accumulation is ∫I rms When the value is less than the threshold ∫I of the integral accumulation result rms阈 When the compressor body 210 is running normally, the integral accumulation result ∫I rms Exceeding the threshold ∫I of the integral accumulation result rms阈 If this occurs, the compressor body 210 will be shut down for protection.

[0120] Example 13:

[0121] In addition to the technical features of the above embodiments, this embodiment further includes the following technical features:

[0122] Third instantaneous current protection threshold I c Less than the second instantaneous current protection threshold I b Second instantaneous current protection threshold I b Less than the first instantaneous current protection threshold I a .

[0123] First instantaneous current protection threshold I a Second instantaneous current protection threshold I b and the third instantaneous current protection threshold I c Decreasing sequentially, the first instantaneous current protection threshold I a Set the hardware overcurrent protection threshold to its maximum value. Based on the first instantaneous current protection threshold I... a It can provide rapid hardware response protection when the current is abnormally high due to reasons such as compressor stall or two-phase short circuit, namely, first-level protection, to prevent the frequency converter from burning out, thereby protecting the compressor body 210.

[0124] Second instantaneous current protection threshold I b The software overcurrent protection threshold is set to be less than the first instantaneous current protection threshold I. a Within the range. Based on the second instantaneous current protection threshold I. b Implementing second-order protection can prevent the compressor body 210 from triggering software overcurrent protection when it fails to trigger overpower protection at low speeds and excessive loads, thus preventing damage to the compressor body 210 caused by operation under high current conditions. The third instantaneous current protection threshold I... c It is the overheat protection current threshold, set to be less than the second instantaneous current protection threshold I. bWithin a certain range, it can prevent the compressor body 210 from overheating due to prolonged overload operation. That is, under the premise of hardware protection and software protection, overheat protection is then applied to the compressor body 210 to form a hierarchical protection structure or method for the compressor body 210, avoiding incomplete or excessive protection of the compressor body 210 caused by a single form of protection.

[0125] Example 14:

[0126] like Figure 7 As shown, an embodiment of the present invention provides a compressor 200, including: a compressor body 210 and a compressor control system 100 of any embodiment of the present invention. The compressor control system 100 is communicatively connected to the compressor body 210 to control the conduction or disconnection of the phase current I in the compressor body 210.

[0127] Example 15:

[0128] like Figure 8 As shown, an embodiment of the present invention provides a refrigeration device 300, including: a refrigerant circulation pipeline 310 and a compressor 200, wherein the refrigerant circulation pipeline 310 is provided with refrigerant, and the compressor 200 is adapted to compress the refrigerant. The compressor 200 includes a compressor body 210 and a compressor control system 100 of any embodiment of the present invention. The compressor control system 100 is communicatively connected to the compressor body 210 to control the conduction or disconnection of the phase current I in the compressor body 210.

[0129] Optionally, the refrigeration equipment 300 in this embodiment is a refrigerator, freezer, or freezer cabinet.

[0130] Example 16:

[0131] like Figure 9 As shown, an embodiment of the present invention provides a compressor control device 400, including: a memory 410 and a processor 420. The memory 410 stores a computer program, and the processor 420 executes the computer program. When executing the computer program, the processor 420 implements the steps of the compressor control method of any embodiment of the present invention.

[0132] Example 17:

[0133] An embodiment of the present invention provides a computer-readable storage medium, comprising: a computer-readable storage medium storing a computer program, wherein when the computer program is executed, it implements the steps of a compressor control method according to any embodiment of the present invention. Specific implementation examples:

[0135] like Figure 10As shown, this embodiment provides a compressor control method, which includes the following steps:

[0136] S202: Acquire instantaneous phase current signal I s ;

[0137] S204: Determine the instantaneous phase current signal I s Is it less than or equal to the first instantaneous current protection threshold I? a ;

[0138] If the determination result is negative, then step S206 is executed; if the determination result is positive, then step S208 is executed.

[0139] S206: Perform shutdown protection on compressor body 210;

[0140] S208: Convert the instantaneous phase current signal I s Converted to effective phase current signal I rms ;

[0141] S210: Determine the effective phase current signal I rms Is it less than or equal to the second instantaneous current protection threshold I? b ;

[0142] If the determination result is negative, step S212 is executed; if the determination result is positive, step S214 is executed.

[0143] S212: Perform shutdown protection on the compressor body 210;

[0144] S214: Determine the effective phase current signal I rms Is it greater than or equal to the third instantaneous current protection threshold I? c ;

[0145] If the determination result is negative, then step S216 is executed; if the determination result is positive, then step S218 is executed.

[0146] S216: Compressor continues to run;

[0147] S218: Determine the result of the integral accumulation ∫I rms Is it less than the threshold ∫I of the integral accumulation result? rms阈 ;

[0148] If the determination result is yes, then step S216 is executed; if the determination result is no, then step S220 is executed.

[0149] S220: Performs shutdown protection on the compressor body 210.

[0150] In summary, the beneficial effects of the embodiments of the present invention are as follows:

[0151] 1. By setting the first instantaneous current protection threshold I a As a hardware overcurrent protection threshold, it enables the hardware to respond quickly and protect against abnormally high current caused by compressor stall, two-phase short circuit, or other reasons, thus preventing the frequency converter from burning out.

[0152] 2. By setting the second instantaneous current protection threshold I b As a software overcurrent protection threshold, it can prevent the compressor from being damaged by high current operation when it is running at low speed or under excessive load, thus preventing damage to the frequency converter and compressor.

[0153] 3. By setting the third instantaneous current protection threshold I c As the overheat protection current threshold for the compressor motor, it can prevent the compressor from overheating due to prolonged overload operation.

[0154] 4. Passing the first instantaneous current protection threshold I a Second instantaneous current protection threshold I b Third instantaneous current protection threshold I c By creating a tiered overcurrent protection system for the compressor, unnecessary overcurrent protection shutdowns can be reduced, especially for variable frequency compressors, thereby improving the compressor's efficiency, stability, and service life.

[0155] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0156] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0157] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compressor control system, characterized in that, include: A signal acquisition device, suitable for acquiring the phase current signal of the compressor body; The first protection device is communicatively connected to the signal acquisition device and is adapted to receive the phase current signal from the signal acquisition device and perform first-order protection on the compressor body according to the phase current signal. The second protection device is communicatively connected to the signal acquisition device and is adapted to receive the phase current signal from the signal acquisition device and perform second-order protection on the compressor body according to the phase current signal. The first protection device includes: The first instantaneous current protection threshold adjustment device is adapted to determine the first instantaneous current protection threshold of the first protection device based on the rated current of the compressor body. The first comparison device is adapted to receive the phase current signal from the signal acquisition device, compare the phase current signal with the first instantaneous current protection threshold, and perform the first-order protection on the compressor body according to the comparison result. The second protection device includes: A phase current signal conversion device is adapted to receive the phase current signal from the signal acquisition device and convert the phase current signal into a valid phase current signal; The second comparison device is adapted to receive the effective phase current signal from the phase current signal conversion device, compare the effective phase current signal with at least one of the second instantaneous current protection threshold and the third instantaneous current protection threshold, and perform the second-order protection on the compressor body according to the comparison result. The first-order protection of the compressor body based on the comparison result specifically includes: If the phase current signal is determined to be less than or equal to the first instantaneous current protection threshold, the phase current in the compressor body is controlled to conduct, and then second-order protection is performed on the compressor body based on the phase current signal; or If the phase current signal is determined to be greater than the first instantaneous current protection threshold, the phase current in the compressor body is controlled to disconnect; wherein, the third instantaneous current protection threshold is less than the second instantaneous current protection threshold, and the second instantaneous current protection threshold is less than the first instantaneous current protection threshold.

2. The compressor control system according to claim 1, characterized in that, The signal acquisition device includes: A signal acquisition device is communicatively connected to the compressor body and is suitable for acquiring the phase current of the compressor body; A signal amplification device, communicatively connected to the signal acquisition device, is adapted to convert the phase current from the signal acquisition device into the phase current signal.

3. The compressor control system according to claim 1 or 2, characterized in that, Also includes: Drive unit, adapted to turn on or off phase current in the compressor body; The first protection device and the second protection device are respectively connected to the drive device in communication to control the drive device to turn on or off the phase current.

4. A method for controlling a compressor, characterized in that, include: Obtain the phase current signal of the compressor body; The compressor body is subjected to first-order protection based on the phase current signal; The compressor body is subjected to second-order protection based on the phase current signal; The first-order protection of the compressor body based on the phase current signal specifically includes: The first instantaneous current protection threshold is determined based on the rated current of the compressor body. The phase current signal is compared with the first instantaneous current protection threshold. Based on the comparison results, the compressor body is subjected to the first-order protection. The second-order protection of the compressor body based on the phase current signal specifically includes: Convert the phase current signal into an effective phase current signal; The effective phase current signal is compared with at least one of the second instantaneous current protection threshold and the third instantaneous current protection threshold; Based on the comparison results, the compressor body is subjected to the second-order protection. The first-order protection of the compressor body based on the comparison result specifically includes: If the phase current signal is determined to be less than or equal to the first instantaneous current protection threshold, the phase current in the compressor body is controlled to conduct, and then second-order protection is performed on the compressor body based on the phase current signal; or If the phase current signal is determined to be greater than the first instantaneous current protection threshold, the phase current in the compressor body is controlled to disconnect; wherein, the third instantaneous current protection threshold is less than the second instantaneous current protection threshold, and the second instantaneous current protection threshold is less than the first instantaneous current protection threshold.

5. The compressor control method according to claim 4, characterized in that, The second-order protection of the compressor body based on the comparison result specifically includes: If the effective phase current signal is determined to be less than the third instantaneous current protection threshold, the phase current in the compressor body is controlled to conduct; or If the effective phase current signal is determined to be greater than the second instantaneous current protection threshold, the phase current in the compressor body is controlled to disconnect.

6. The compressor control method according to claim 4, characterized in that, The second-order protection of the compressor body based on the comparison result specifically includes: The effective phase current signal is determined to be greater than or equal to the third instantaneous current protection threshold and less than or equal to the second instantaneous current protection threshold. The effective phase current signal within the integration time range is integrated and accumulated to obtain the integration and accumulation result; The compressor body is subjected to the second-order protection based on the integral accumulation result. The integration time range is the time range during which the effective phase current signal is maintained within the third instantaneous current protection threshold and the second instantaneous current protection threshold.

7. The compressor control method according to claim 6, characterized in that, The second-order protection of the compressor body based on the integral accumulation result specifically includes: If the integral accumulation result is determined to be less than the integral accumulation result threshold, the phase current in the compressor body is controlled to conduct; or If the integral accumulation result is determined to be greater than or equal to the integral accumulation result threshold, the phase current in the compressor body is controlled to disconnect.

8. A compressor, characterized in that, include: Compressor body; The compressor control system according to any one of claims 1 to 3 is communicatively connected to the compressor body to control the conduction or disconnection of phase current in the compressor body.

9. A refrigeration device, characterized in that, include: The refrigerant circulation pipeline is equipped with refrigerant. A compressor adapted to compress the refrigerant; The compressor includes a compressor body and a compressor control system as described in any one of claims 1 to 3. The compressor control system is communicatively connected to the compressor body to control the conduction or disconnection of phase current in the compressor body.

10. A control device for a compressor, characterized in that, include: Memory, which stores computer programs; The processor executes the computer program; Wherein, when the processor executes the computer program, it implements the steps of the compressor control method as described in any one of claims 4 to 7.

11. A computer-readable storage medium, characterized in that, include: The computer-readable storage medium stores a computer program that, when executed, implements the steps of the compressor control method as described in any one of claims 4 to 7.

Images