Method and apparatus for controlling a chiller, chiller

Abstract

The application relates to the technical field of refrigerators, and discloses a method for controlling a refrigerator, which comprises the following steps: in the case that a first power supply voltage is less than a first power supply threshold or a second power supply voltage is less than a second power supply threshold, switching to a standby power supply to supply power to a frequency conversion board; judging whether a mover eccentricity fault occurs according to a current signal input into the refrigerator; and performing a correction operation in the case that the mover eccentricity fault is judged to occur. Therefore, the reliability of the refrigerator in the start-stop process is ensured. The application further discloses a device for controlling a refrigerator and a refrigerator.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, for example, to a method and device for controlling a refrigerator, and a refrigerator. BACKGROUND

[0002] At present, if the system of a pneumatic bearing free piston refrigerator is shut down due to an unexpected situation, or the refrigerator is inclined for a long time, the mover may deviate from the designed center position, resulting in cylinder collision after the next start, and in serious cases, the internal components of the refrigerator may be damaged. Therefore, in order to realize the industrialization of the free piston refrigerator, the problem of cylinder collision caused by the eccentricity of the mover must be solved first.

[0003] The traditional gas bearing Stirling refrigerator controller uses a small amplitude pulse positioning method for starting. This starting method can alleviate the problem of starting cylinder collision to some extent when the refrigerator is placed horizontally. However, when the refrigerator is placed vertically, the problem of starting cylinder collision cannot be solved.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] The refrigerator still has the problem of starting cylinder collision in some cases, and the reliability of the starting process of the refrigerator is insufficient. SUMMARY

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, the following summary has been provided. The summary is not an extensive overview of the application. It is not intended to identify key / critical elements of the application or to delineate the scope of the embodiments, but to present some aspects of the embodiments in a simplified form as a prelude to the more detailed description that is presented later.

[0007] The embodiments of the present disclosure provide a method and device for controlling a refrigerator, and a refrigerator, to improve the reliability of the starting process of the refrigerator.

[0008] In some embodiments, the above-mentioned refrigerator comprises: a power assembly comprising a cylinder and a mover moving back and forth in the cylinder; a frequency conversion board for adjusting the current size input to the power assembly to control the position of the mover; a first power supply connected between an alternating current input end and the frequency conversion board, for supplying power to a device operating at a first voltage; a second power supply connected between the alternating current input end and the frequency conversion board, for supplying power to a device operating at a second voltage; a backup power supply provided between the first power supply and the frequency conversion board, for supplying power to the frequency conversion board; a main control board connected to the frequency conversion board, for controlling the operating state of the refrigerator; and the above-mentioned method comprises: in the case that the first power supply voltage is less than a first power supply threshold or the second power supply voltage is less than a second power supply threshold, switching to the backup power supply to supply power to the frequency conversion board; judging whether a mover eccentricity fault occurs according to a current signal output by the backup power supply; and in the case that it is judged that a mover eccentricity fault occurs, performing a correction operation.

[0009] Optionally, in the case of switching to the backup power supply to supply power to the refrigerator, further comprising: controlling the refrigerator to normally stop in the case that the refrigerator is in a running state; controlling the refrigerator to start at a preset power in the case that the refrigerator is in a stopped state and the first power supply voltage is greater than or equal to the first power supply threshold value and the second power supply voltage is greater than or equal to the second power supply threshold value.

[0010] Optionally, the backup power supply comprises a power storage device, a charging circuit and a power supply circuit; wherein the input end of the charging circuit is connected to the first power supply, and the output end is connected to the power storage device, for supplying power to the power storage device; the input end of the power supply circuit is connected to the power storage device, and the output end is connected to the frequency conversion board, for supplying power to the refrigerator; in the case that the first power supply voltage is greater than or equal to the first power supply threshold value and the second power supply voltage is greater than or equal to the second power supply threshold value, comprising: obtaining the voltage value of the power storage device; in the case that the voltage value of the power storage device is less than or equal to the charging threshold value, turning on the charging circuit.

[0011] Optionally, according to the current signal input to the refrigerator, it is judged whether the mover eccentricity fault occurs, comprising: calculating the mean square difference of the positive half cycle mean square value and the negative half cycle mean square value of the current; in the case that the mean square difference is greater than or equal to the difference threshold value, it is determined that the mover eccentricity fault occurs.

[0012] Optionally, in the case that it is judged that the mover eccentricity fault occurs, a correction operation is performed, comprising: determining the half cycle with the smaller mean square value between the positive half cycle mean square value and the negative half cycle mean square value as the target half cycle; controlling the frequency conversion board to output the voltage signal of the target half cycle.

[0013] Optionally, after controlling the frequency conversion board to output the voltage signal of the target half cycle, further comprising: controlling the frequency conversion board to output the duty cycle of the voltage, so that the correction current output by the frequency conversion board is less than or equal to the current threshold value; in the case that the correction time length of the correction current output by the frequency conversion board reaches the set time length, the mover eccentricity fault is judged again.

[0014] Optionally, in the case that it is judged that the mover eccentricity fault occurs, further comprising: sending a fault code to the main control board; performing the correction operation again until the correction times are greater than the set times.

[0015] Optionally, in the case that the correction times are greater than the set times, further comprising: in the case that it is judged that the mover eccentricity fault still exists, sending an alarm information.

[0016] Optionally, in the case of determining that the mover eccentricity fault does not occur, the method comprises: acquiring the current first power supply voltage and the current second power supply voltage; in the case that the current first power supply voltage is greater than or equal to the first power supply threshold and the current second power supply voltage is greater than or equal to the second power supply threshold, sending a troubleshooting signal to the main control board; in response to the troubleshooting signal, deleting the fault code and sending a start-up instruction to the refrigerator.

[0017] In some embodiments, the device comprises a main control board and a memory storing program instructions, and the main control board is configured to execute the method for controlling the refrigerator when the program instructions are executed.

[0018] In some embodiments, the refrigerator comprises: a power assembly comprising a cylinder and a mover reciprocating in the cylinder; a frequency conversion board connected to the power assembly, for adjusting the current size input to the power assembly to control the position of the mover; a first power supply having one end connected to an AC input end and the other end connected to the frequency conversion board, for supplying power to devices operating at a first voltage; a second power supply having one end connected to the AC input end and the other end connected to the frequency conversion board, for supplying power to devices operating at a second voltage; a backup power supply having one end connected to the first power supply and the other end connected to the frequency conversion board, for supplying power to the frequency conversion board; a main control board connected to the frequency conversion board, for controlling the operating state of the refrigerator; and the device for controlling the refrigerator.

[0019] Optionally, the backup power supply comprises: a power storage device for storing electric energy; a charging circuit having an input end connected to the first power supply and an output end connected to the power storage device, for supplying power to the power storage device; and a power supply circuit having an input end connected to the power storage device and an output end connected to the frequency conversion board, for supplying power to the refrigerator.

[0020] The method and device for controlling the refrigerator, and the refrigerator provided by the embodiments of the present disclosure can achieve the following technical effects:

[0021] When the frequency conversion board detects that any one of the first power supply and the second power supply is lower than its threshold value, it is determined that the refrigerator may have a power failure fault. At this time, the refrigerator is switched to be powered by the backup power supply, and at the same time, the main control board determines whether the refrigerator has a mover eccentricity fault according to the current signal output by the backup power supply. If it is determined that the refrigerator has a mover eccentricity problem, a correction operation is performed. Thus, the reliability of the refrigerator during the start-up process is ensured.

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

[0023] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the embodiments. Like numbers refer to like elements throughout the drawings, which are not necessarily to scale, and in which:

[0024] Figure 1 is a structural schematic diagram of a refrigeration machine provided by an embodiment of the present disclosure;

[0025] Figure 2 is a structural schematic diagram of a refrigeration machine provided by an embodiment of the present disclosure;

[0026] Figure 3 is a structural schematic diagram of a refrigeration machine provided by an embodiment of the present disclosure;

[0027] Figure 4 is a structural schematic diagram of a refrigeration machine provided by an embodiment of the present disclosure;

[0028] Figure 5 is a structural schematic diagram of a refrigeration machine provided by an embodiment of the present disclosure;

[0029] Figure 6 is a structural schematic diagram of a refrigeration machine provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] In order to enable every detailed understanding of the features and technical contents of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the drawings for reference only, and not to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, through multiple details, a sufficient understanding of the disclosed embodiments is provided. However, one or more embodiments can still be implemented without these details. In other cases, for the sake of simplicity of the drawings, well-known structures and devices can be simplified.

[0031] The terms "first", "second", and the like in the description and claims of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0032] Unless otherwise specified, the term "a plurality of" means two or more.

[0033] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B means A or B.

[0034] The term "and / or" is a description of an association relationship, which means that there can be three relationships. For example, A and / or B means that there are three relationships of A or B, or A and B.

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

[0036] In combination Figure 1 The refrigeration machine shown includes a frequency conversion board 130, a first power supply 110, a second power supply 120, a backup power supply 140, a main control board 100 and a power assembly 150. Among them, the power assembly 150 includes a cylinder, a stator and a mover reciprocating in the cylinder. The power assembly 150 is used to provide power for the flow of refrigerant in the refrigeration machine. The frequency conversion board 130 is mainly used to adjust the current size input to the power assembly 150 to control the position of the mover. The first power supply 110 and the second power supply 120 are connected between the alternating current input end AC and the frequency conversion board 130, respectively. The first power supply 110 is used to power the devices running at the first voltage, and the second power supply 120 is used to power the devices running at the second voltage. The main control board 100 is connected to the frequency conversion board 130, used to accept the corresponding feedback signal and control the running state of the refrigeration machine. The backup power supply 140 is arranged between the first power supply 110 and the frequency conversion board 130, used to power the frequency conversion board 130. In addition, the backup power supply 140 includes a power storage device 142, a charging circuit 141 and a power supply circuit 143. Among them, the power storage device 142 is arranged between the charging circuit 141 and the power supply circuit 143, used to provide the required power to the frequency conversion board 130. The input end of the charging circuit 141 is connected to the first power supply 110, and the input end is connected to the power storage device 142, used to power the power storage device 142. The input end of the power supply circuit 143 is connected to the power storage device 142, and the output end is connected to the frequency conversion board 130, used to power the refrigeration machine.

[0037] In combination Figure 1 The refrigeration machine shown, the method for controlling the refrigeration machine is provided. As shown in the embodiment of the present disclosure, Figure 2 The method comprises the following steps:

[0038] S01, in the case that the first power supply voltage is less than the first power supply threshold or the second power supply voltage is less than the second power supply threshold, the refrigeration machine is switched to the backup power supply.

[0039] S02, the frequency conversion board judges whether the mover eccentricity fault occurs according to the current signal input to the refrigeration machine.

[0040] S03, in the case that the mover eccentricity fault occurs, the frequency conversion board executes the correction operation.

[0041] The method for controlling the refrigerator provided by the embodiment of the present disclosure can determine that the refrigerator may have a power failure when the frequency conversion board detects that any one of the first power supply and the second power supply is lower than its threshold value. At this time, the refrigerator automatically switches to the standby power supply for power supply, and the main control board determines whether the refrigerator has a mover eccentricity failure according to the current signal output by the standby power supply. In addition, the refrigerator can also send switching suggestion information to the user, and the user can determine whether to switch the standby power supply for power supply. If it is determined that the refrigerator has a mover eccentricity problem, a correction operation is performed. Thus, the reliability of the refrigerator during the starting process is ensured.

[0042] Specifically, according to the type of power failure, the refrigerator performs corresponding operations. First, the standby power supply can be used to ensure the safe shutdown of the Stirling machine to avoid mover eccentricity caused by sudden shutdown problems. Second, if the refrigerator has already stopped or is in a stopped state, the reason for the stop is determined. If there is no power at the AC input end of the refrigerator, it means that the external power supply is powered off, and the refrigerator continues to remain in a stopped state and sends warning information to the user. If there is power at the AC input end of the refrigerator, and the DC output ends of the first power supply and the second power supply do not detect voltage within a set time period, it means that the power module fails, and at this time the refrigerator remains in a stopped state and sends module failure information to the user; if there is power at the AC input end of the refrigerator, and the DC output ends of the first power supply and the second power supply detect voltage within a set time period, it means that the power output protection is effective. At this time, the refrigerator can normally start and enter the correction program, and there is no need to consider the voltage changes of the first power supply and the second power supply. The set time period is any value within [5, 15] s, and preferably can be 7 s, 10 s or 13 s. During the starting process of the refrigerator, the forward starting operation is first performed, and whether the correction is successful is detected. In the case of forward starting correction failure, the refrigerator performs the reverse starting operation, and whether the correction is successful is detected. In the case of both forward starting and reverse starting failure, warning information is sent to the user. In addition, during the starting process of the refrigerator, the reverse starting operation can also be performed first, and then the forward starting operation is performed. The specific mode is determined by the actual situation and is not described here.

[0043] Optionally, in the case of switching to the standby power supply to supply power to the refrigerator, it further includes: in the case that the refrigerator is in a running state, the main control board controls the refrigerator to normally stop. In the case that the refrigerator is in a stopped state and the first power supply voltage is greater than or equal to the first power supply threshold value and the second power supply voltage is greater than or equal to the second power supply threshold value, the main control board controls the refrigerator to start at a preset power.

[0044] In this way, in the case of external power failure, if the standby power supply is switched, the refrigerator is still in operation. At this time, the refrigerator is preferentially controlled to shut down normally to avoid insufficient standby power supply power leading to sudden shutdown, thereby reducing the service life of the refrigerator. In the case where the refrigerator is in a shutdown state and the first power supply voltage is greater than or equal to the first power supply threshold value and the second power supply voltage is greater than or equal to the second power supply threshold value, the refrigerator is controlled to start with a small power. In order to avoid the case where the mover is eccentric, the refrigerator is operated at rated power, which may cause damage to the refrigerator. The preset power can be 30% to 40% of the rated starting power of the refrigerator, and the specific value can be selected according to the actual situation.

[0045] Optionally, in the case where the first power supply voltage is greater than or equal to the first power supply threshold value and the second power supply voltage is greater than or equal to the second power supply threshold value, the frequency conversion board obtains the voltage value of the power storage device; and in the case where the voltage value of the power storage device is less than or equal to the charging threshold value, the frequency conversion board connects the charging circuit.

[0046] In this way, the power supply of the standby power supply can be better ensured. In the case where the first power supply voltage is greater than or equal to the first power supply threshold value and the second power supply voltage is greater than or equal to the second power supply threshold value, it is considered that a power failure has not occurred. At this time, the power is sufficient, and the voltage value of the power storage device is obtained while the refrigerator is normally operated. In the case where the voltage value of the power storage device is less than or equal to the charging threshold value, it is considered that the remaining power of the current standby power supply is insufficient. At this time, the charging circuit is connected to charge the power storage device by the first power supply. The charging threshold value can be any value in the range of 70% to 90% of the rated voltage value of the power storage device. The first power supply threshold value can be any value in the range of 75% to 85% of the rated voltage value, and the second power supply threshold value can be any value in the range of 75% to 85% of the rated voltage value. In addition, unlike the traditional 12V standby power supply, the rated voltage of the above-mentioned power storage device is consistent with that of the refrigerator. For example, if the rated voltage of the refrigerator is 48V, the rated voltage of the power storage device is 48V. If the rated voltage of the refrigerator is 72V, the rated voltage of the power storage device is 72V.

[0047] Optionally, the frequency conversion board determines whether the mover eccentricity fault occurs according to the current signal input into the refrigerator, including: the frequency conversion board calculates the mean square value difference between the positive half cycle mean square value and the negative half cycle mean square value of the current; and in the case where the mean square value difference is greater than or equal to a difference threshold value, the frequency conversion board determines that the mover eccentricity fault occurs.

[0048] Thus, it can be better determined whether the mover eccentricity fault occurs. The frequency conversion board calculates the difference between the mean square values of the positive half cycle mean square value and the negative half cycle mean square value of the current signal output by the backup power supply. For example, the difference between the positive half cycle mean square value and the negative half cycle mean square value of the current should be zero under normal circumstances. Then, the half cycle mean square value under this circumstance is taken as the standard mean square value, and the difference threshold is set to be 20% of the standard mean square value. In the case where the difference between the mean square values is greater than or equal to the difference threshold, it is considered that the refrigeration machine has the mover eccentricity fault.

[0049] Optionally, in the case where it is judged that the mover eccentricity fault occurs, the frequency conversion board performs a correction operation, including: the frequency conversion board determines the half cycle with the smaller mean square value between the positive half cycle mean square value and the negative half cycle mean square value as the target half cycle; and the frequency conversion board controls the power supply circuit to output the voltage signal of the target half cycle.

[0050] Thus, the reliability of the refrigeration machine during the starting process can be better ensured. In the case where it is judged that the mover eccentricity fault occurs, the current value of the half cycle with the larger mean square value is relatively large. It is indicated that the back electromotive force is small due to the occurrence of the cylinder collision fault, and thus the current is large under the same voltage. That is, it can be determined that the side with the large current is the side to which the mover deviates. For example, in the case where the mover eccentricity fault occurs and the current of the positive half cycle is large, the frequency conversion board performs a correction operation. At this time, only the voltage of the negative half wave cycle is output, the movement of the mover is controlled to the negative half cycle direction, and the gas is allowed to leak to the positive half cycle side through the aerodynamic bearing.

[0051] In combination with Figure 3 The embodiment of the present disclosure provides another method for controlling a refrigeration machine, including:

[0052] S01, in the case where the first power supply voltage is less than a first power supply threshold or the second power supply voltage is less than a second power supply threshold, the refrigeration machine is switched to be powered by a backup power supply.

[0053] S02, the frequency conversion board judges whether a mover eccentricity fault occurs according to the current signal input into the refrigeration machine.

[0054] S03, in the case where it is judged that the mover eccentricity fault occurs, the frequency conversion board performs a correction operation.

[0055] S04, the frequency conversion board controls the duty cycle of the voltage output by the power supply circuit, so that the correction current output by the frequency conversion board is less than or equal to a current threshold.

[0056] S05, in the case where the correction duration of the correction current output by the frequency conversion board reaches a set duration, the frequency conversion board judges again whether the mover eccentricity fault occurs.

[0057] The method for controlling the refrigeration machine provided by the embodiment of the present disclosure can reset the mover through multiple micro-adjustments. The method uses a square wave control method to realize the eccentric adjustment operation of the mover. For example, the correction current is controlled to be less than or equal to 30 A, and the set time length is 200 ms. After the adjustment is completed, the difference between the mean square values of the positive half cycle and the negative half cycle of the current is calculated again to determine whether the mover is still in an eccentric state. If the mover is still in an eccentric state, the correction operation is performed again. In each correction operation, the correction current is less than or equal to 30 A, and the correction current gradually decreases as the difference between the mean square values decreases. The set time length of each correction operation is 200 ms.

[0058] In combination with Figure 4 The embodiment of the present disclosure provides another method for controlling a refrigeration machine, which comprises the following steps:

[0059] S01, in the case that the first power supply voltage is less than the first power supply threshold or the second power supply voltage is less than the second power supply threshold, the refrigeration machine is switched to be powered by the backup power supply.

[0060] S02, the variable frequency board determines whether a mover eccentricity fault occurs according to the current signal input into the refrigeration machine.

[0061] S03, in the case that the mover eccentricity fault is determined to occur, the variable frequency board performs a correction operation.

[0062] S09, the variable frequency board sends a fault code to the main control board.

[0063] S04, the variable frequency board controls the duty cycle of the output voltage of the power supply circuit, so that the correction current output by the variable frequency board is less than or equal to a current threshold.

[0064] S05, in the case that the correction time length of the correction current output by the variable frequency board reaches a set time length, the variable frequency board determines again whether the mover eccentricity fault occurs.

[0065] S06, in the case that the mover eccentricity fault is determined not to occur, the main control board acquires the current first power supply voltage and the current second power supply voltage.

[0066] S07, in the case that the first power supply voltage is greater than or equal to the first power supply threshold and the second power supply voltage is greater than or equal to the second power supply threshold, the variable frequency board sends a fault elimination signal to the main control board.

[0067] S10, the main control board deletes the fault code and sends a start-up instruction to the refrigeration machine in response to the fault elimination signal.

[0068] S11, the main control board controls the refrigeration machine to perform a start-up operation.

[0069] The method for controlling the refrigerator provided by the embodiment of the present disclosure can accurately determine the current fault type. In the case of determining that the mover eccentricity fault occurs, the frequency conversion board performs the correction operation and sends the fault code to the main control board. After the initial adjustment ends, the mover eccentricity position is determined periodically to determine whether to perform the mover correction operation. Until the number of determination periods reaches the set number, the refrigerator fault is determined. If the mover reset is completed before the number of determination periods reaches the set number, the frequency conversion board sends the fault elimination signal to the main control board to make the main control board clear the corresponding fault information. At this time, the power-off fault and the eccentricity fault of the refrigerator are eliminated, and the refrigerator performs the start operation, thereby avoiding the damage of the above faults to the refrigerator during the start process of the refrigerator.

[0070] Optionally, after the frequency conversion board sends the fault code to the main control board, the method further includes: the refrigerator performs the correction operation again until the number of correction times is greater than the set number. In the case where the number of correction times is greater than the set number, the method further includes: in the case where it is determined that the mover eccentricity fault still exists, the main control board sends the warning information to the user.

[0071] In this way, the refrigerator can be effectively prevented from staying in the correction process all the time, which leads to the difficulty of the refrigerator in normal operation and further affects the user experience. For the fault that may need to be adjusted by the user from the outside, the user is timely prompted to adjust.

[0072] In combination with Figure 5 The embodiment of the present disclosure provides another method for controlling the refrigerator, which includes:

[0073] S200, the frequency conversion board acquires the first power supply voltage and the second power supply voltage.

[0074] S211, the main control board determines whether the first power supply voltage is less than the first power supply threshold. If yes, step S220 is performed; if no, step S212 is performed.

[0075] S212, the main control board determines whether the second power supply voltage is less than the second power supply threshold. If yes, step S220 is performed; if no, step S260 is performed.

[0076] S220, the refrigerator switches to the standby power supply for power supply.

[0077] S230, the frequency conversion board acquires the current signal output by the standby power supply.

[0078] S231, the frequency conversion board determines whether the mover eccentricity fault occurs. If yes, step S232 is performed; if no, step S240 is performed.

[0079] S232, the frequency conversion board judges whether the cycle number is less than or equal to the cycle number threshold. If yes, step S233 is executed; if no, step S250 is executed.

[0080] S233, the frequency conversion board sends a fault code to the main control board.

[0081] S234, the frequency conversion board executes a correction operation, and the cycle number is added by one. And returns to step S230.

[0082] S240, the main control board clears the fault code, the refrigerator gradually increases the running power, and enters the normal refrigeration link.

[0083] S250, the main control board feeds back the equipment fault information according to the fault code.

[0084] S260, the main control board judges whether the remaining power of the backup power supply is sufficient. If yes, return to step S200; if no, execute step S270.

[0085] S270, the backup power supply connects the charging circuit to charge.

[0086] The method for controlling the refrigerator provided by the embodiment of the present disclosure can exclude the problem of cylinder collision of the refrigerator during startup caused by special circumstances. The first power supply voltage and the second power supply voltage are obtained by the frequency conversion board, and it is judged whether the first power supply voltage is less than the first power supply threshold, and whether the second power supply voltage is less than the second power supply threshold. If the voltages of both are greater than the corresponding power supply threshold, it is judged whether the power in the backup power supply is sufficient. In the case of sufficient power, the startup operation is directly run. In the case of insufficient power, the charging circuit is started to charge the power storage device. In the case that the voltage of any one of the two power supplies is less than the voltage threshold, it is determined that a power failure may occur. At this time, the frequency conversion board sends a fault code to the main control board, and the power supply mode is switched to backup power supply. At this time, since there is a possibility of mover eccentricity, the frequency conversion board judges the current mover state through the current signal output by the backup power supply. If the mover eccentricity fault occurs, it is judged whether the current adjustment cycle number exceeds the cycle number threshold. If the cycle number does not exceed the cycle number threshold, the correction operation is executed. Thereafter, the position of the mover is judged again, and the correction operation is executed. Until the position of the mover is reset, or the adjustment cycle number exceeds the cycle number threshold. Thus, in the case of judging that the mover is reset, the main control board deletes all fault codes. At the same time, in the case that the power supply is restored to normal, the refrigerator is started and the running power is gradually increased, and enters the normal refrigeration link. In the case of judging that the adjustment cycle number exceeds the cycle number threshold, it is determined that there is a component fault in the equipment, and the main control board feeds back the equipment fault information according to the fault code.

[0087] In combination Figure 6As shown, the embodiment of the present disclosure provides a device for controlling a refrigeration machine, which comprises a processor 100 and a memory 101. Optionally, the device can further comprise a communication interface 102 and a bus 103. The processor 100, the communication interface 102 and the memory 101 can communicate with each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call the logical instructions in the memory 101 to execute the method for controlling a refrigeration machine in the above embodiment.

[0088] In addition, the logical instructions in the memory 101 can be realized in the form of a software functional unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0089] The memory 101 as a computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 100 executes the program instructions / modules stored in the memory 101, thereby performing function applications and data processing, that is, realizing the method for controlling a refrigeration machine in the above embodiment.

[0090] The memory 101 can include a program storage area and a data storage area. The program storage area can store an operating system and at least one application required by a function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 101 can include a high-speed random access memory and can further include a non-volatile memory.

[0091] The embodiment of the present disclosure provides a refrigeration machine comprising the device for controlling a refrigeration machine.

[0092] The embodiment of the present disclosure provides a storage medium, which stores computer executable instructions, and the computer executable instructions are set to execute the method for controlling a refrigeration machine.

[0093] The storage medium can be a transitory storage medium or a non-transitory storage medium.

[0094] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method disclosed in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes, and can also be a transitory storage medium.

[0095] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural, logical, electrical, process, and other changes. The embodiments represent only a few of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be changed. Parts and features of some embodiments can be included in or replace parts and features of other embodiments. Also, the words used in this application are only used to describe the embodiments and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more associated listed items. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" and the like mean the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, or device including the stated element. In this document, each embodiment focuses on the differences from other embodiments, and the same or similar parts between various embodiments can be referred to each other. For the method, product, etc. disclosed in the embodiments, if it corresponds to the method part disclosed in the embodiments, the relevant part can be referred to the description of the method part.

[0096] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to realize the described functions, but such implementation should not be considered beyond the scope of the embodiments of the present disclosure. The skilled person can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0097] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units can only be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms. The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to implement the embodiments. In addition, each functional unit in the embodiments of the present disclosure can be integrated in one processing unit, or each unit can be a physically independent unit, or two or more units can be integrated in one unit.

[0098] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

Claims

1. A method for controlling a chiller, characterized by, The refrigerating machine comprises: a power assembly comprising a cylinder and a mover reciprocating in the cylinder; a frequency conversion board for adjusting the current size input to the power assembly to control the mover position; a first power supply connected between an AC input and the frequency conversion board for powering devices operating at a first voltage; a second power supply connected between the AC input and the frequency conversion board for powering devices operating at a second voltage; a backup power supply arranged between the first power supply and the frequency conversion board for powering the frequency conversion board; and a main control board connected to the frequency conversion board for controlling the operation state of the refrigerating machine; the method comprises: switching to the backup power supply to power the frequency conversion board when the first power supply voltage is less than a first power supply threshold or the second power supply voltage is less than a second power supply threshold; judging whether the mover eccentricity fault occurs according to the current signal input to the refrigerating machine; performing a correction operation when the mover eccentricity fault is judged to occur; wherein the correction operation comprises: obtaining a positive half-cycle mean square value and a negative half-cycle mean square value; determining a target half-cycle as the half-cycle with the smaller mean square value between the positive half-cycle mean square value and the negative half-cycle mean square value; controlling the frequency conversion board to output a voltage signal of the target half-cycle; controlling the duty cycle of the voltage output by the frequency conversion board so that the correction current output by the frequency conversion board is less than or equal to a current threshold; and judging again whether the mover eccentricity fault occurs when the correction duration of the correction current output by the frequency conversion board reaches a set duration.

2. The method of claim 1, wherein, when the backup power supply is switched to power the refrigerating machine, the method further comprises: controlling the refrigerating machine to normally stop when the refrigerating machine is in an operation state; controlling the refrigerating machine to start at a preset power when the refrigerating machine is in a stop state and the first power supply voltage is greater than or equal to the first power supply threshold and the second power supply voltage is greater than or equal to the second power supply threshold.

3. The method of claim 1, wherein, The backup power supply comprises a power storage device, a charging circuit and a power supply circuit; wherein the input of the charging circuit is connected to the first power supply, and the output is connected to the power storage device for powering the power storage device; the input of the power supply circuit is connected to the power storage device, and the output is connected to the frequency conversion board for powering the frequency conversion board. when the first power supply voltage is greater than or equal to the first power supply threshold and the second power supply voltage is greater than or equal to the second power supply threshold, the method comprises: obtaining the voltage value of the power storage device; turning on the charging circuit when the voltage value of the power storage device is less than or equal to a charging threshold.

4. The method of claim 3, wherein, The method of judging whether the mover eccentricity fault occurs according to the current signal input to the refrigerating machine comprises: calculating the mean square value difference between the positive half-cycle mean square value and the negative half-cycle mean square value of the current; determining that the mover eccentricity fault occurs when the mean square value difference is greater than or equal to a difference threshold.

5. The method of claim 1, wherein, When the mover eccentricity fault is judged to occur, the method further comprises: sending a fault code to the main control board; performing the correction operation again until the correction times are greater than a set number of times.

6. The method of claim 5, wherein, When the correction times are greater than the set number of times, the method further comprises: sending an alarm message when the mover eccentricity fault is still judged to exist.

7. The method of claim 5, wherein, In the case of determining that the mover eccentricity fault does not occur, further comprising: acquiring a current first power supply voltage and a current second power supply voltage; in the case that the current first power supply voltage is greater than or equal to a first power supply threshold and the current second power supply voltage is greater than or equal to a second power supply threshold, sending a troubleshooting signal to a main control board; in response to the troubleshooting signal, deleting the fault code and sending a start-up instruction to the refrigerator.

8. An apparatus for controlling a chiller comprising a master control board and a memory having program instructions stored therein, wherein, The main control board is configured to execute the method for controlling the refrigerator as claimed in any one of claims 1 to 7 when running the program instruction.

9. A refrigerator characterized by comprising: comprising: a power assembly comprising a cylinder and a mover reciprocating in the cylinder; a frequency conversion board connected to the power assembly for adjusting the current size input to the power assembly to control the position of the mover; a first power supply having one end connected to an AC input and the other end connected to the frequency conversion board for supplying power to devices running at a first voltage; a second power supply having one end connected to the AC input and the other end connected to the frequency conversion board for supplying power to devices running at a second voltage; a backup power supply having one end connected to the first power supply and the other end connected to the frequency conversion board for supplying power to the frequency conversion board; a main control board connected to the frequency conversion board for controlling the operating state of the refrigerator; and the device for controlling the refrigerator as claimed in claim 8.

10. The refrigerator of claim 9, wherein, The backup power supply comprises: a power storage device for storing electrical energy; a charging circuit having an input end connected to the first power supply and an output end connected to the power storage device for supplying power to the power storage device; a power supply circuit having an input end connected to the power storage device and an output end connected to the frequency conversion board for supplying power to the frequency conversion board.

Images