CN109245657B - Compressor driving system starting control method, device and equipment and refrigerator - Google Patents
Compressor driving system starting control method, device and equipment and refrigerator Download PDFInfo
- Publication number
- CN109245657B CN109245657B CN201811352928.0A CN201811352928A CN109245657B CN 109245657 B CN109245657 B CN 109245657B CN 201811352928 A CN201811352928 A CN 201811352928A CN 109245657 B CN109245657 B CN 109245657B
- Authority
- CN
- China
- Prior art keywords
- bus voltage
- preset
- current
- positioning
- driving system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/28—Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
Abstract
The application relates to a method, a device and equipment for controlling the starting of a compressor driving system and a refrigerator, and the method comprises the steps of obtaining a random carrier frequency and an initial positioning current; controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current to increase, and detecting to obtain updated positioning current; when the updated positioning current reaches a preset threshold value within a preset positioning duration, obtaining a bus voltage value; and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram. The random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near the integral multiple of the carrier frequency, evenly spread the harmonic distribution on the whole frequency spectrum, the starting control method can ensure that the controller can output enough voltage when the oil applying rotating speed closed loop fixed frequency operation is switched, the driving system obtains the maximum motor starting torque, the starting speed is high, the starting capability is strong, and the starting vibration noise is small.
Description
Technical Field
The present disclosure relates to a drive system start control technology, and more particularly, to a method, an apparatus, a device, and a refrigerator for controlling a compressor drive system.
Background
In recent years, because of the superiority of the technology without electrolytic capacitor in the aspects of reliability, cost and the like, the bus permanent magnet synchronous compressor driving system without electrolytic capacitor has become a research hotspot of experts at home and abroad.
In a traditional compressor driving system without an electrolytic capacitor inverter for a bus, how to drive a compressor to operate under a steady-state working condition is usually considered, but the problem of how to reduce noise and vibration when the compressor is driven to start and operate is not considered and solved. The traditional compressor driving system of the bus electrolytic capacitor-free inverter has large noise and vibration in the starting and running stage.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus, a device and a refrigerator for controlling the start-up of a compressor driving system, which can effectively reduce the noise vibration of the compressor in the start-up operation stage, in order to solve the technical problem of the conventional compressor driving system that the noise vibration is large in the start-up operation stage.
A compressor drive system start-up control method, the method comprising:
acquiring random carrier frequency and initial positioning current;
controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain updated positioning current;
detecting to obtain a bus voltage value of a direct current bus side of the compressor driving system when the updated positioning current reaches a preset threshold value within a preset positioning duration;
and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
In one embodiment, the step of controlling the compressor driving system to sequentially switch to the open-loop operation and the oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset dc bus voltage waveform diagram includes:
when the bus voltage value reaches a first preset bus voltage threshold value according to a preset direct current bus voltage waveform diagram, controlling the compressor driving system to switch to open-loop operation, and detecting again to obtain an updated bus voltage value after detecting that the open-loop rotating speed reaches a preset rotating speed value;
and when detecting that the updated bus voltage value reaches a second preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram, controlling the compressor driving system to be switched to the upper oil closed-loop fixed frequency operation.
In one embodiment, the step of controlling the compressor driving system to sequentially switch to the open-loop operation and the oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset dc bus voltage waveform diagram further includes:
and returning to the step of obtaining the bus voltage value of the direct current bus side of the compressor driving system by detection when the bus voltage value is detected to not reach a first preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram.
In one embodiment, the step of controlling the compressor driving system to sequentially switch to the open-loop operation and the oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset dc bus voltage waveform diagram further includes:
and returning to the step of detecting again to obtain the updated bus voltage value when the updated bus voltage value is detected to not reach a second preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram.
In one embodiment, after the steps of controlling the compressor driving system to perform positioning operation according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain an updated positioning current, the method further includes:
and returning to the step of controlling the output of the positioning current to the compressor driving system to increase when the updated positioning current does not reach the preset threshold value within the preset positioning duration, and detecting to obtain the updated positioning current.
In one embodiment, after the step of acquiring the random carrier frequency and the initial positioning current, the method further includes:
detecting noise vibration;
when the noise vibration is within a preset noise vibration range, setting the carrier frequency of the next control period as a fixed value;
and when the noise vibration is not in the preset noise vibration range, setting the carrier frequency of the next control period as a random number.
A compressor drive system start-up control apparatus, the apparatus comprising:
the parameter acquisition module is used for acquiring random carrier frequency and initial positioning current;
the positioning current control module is used for controlling the compressor driving system to perform positioning operation according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain an updated positioning current;
the bus voltage value detection module is used for detecting and obtaining a bus voltage value of a direct current bus side of the compressor driving system when the updated positioning current reaches a preset threshold value within a preset positioning duration;
and the operation switching control module is used for controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring random carrier frequency and initial positioning current;
controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain updated positioning current;
detecting to obtain a bus voltage value of a direct current bus side of the compressor driving system when the updated positioning current reaches a preset threshold value within a preset positioning duration;
and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
A starting control device of a compressor driving system comprises a controller, a current detection device, a bus voltage detection device, a random generator and the compressor driving system which are all connected with the controller,
the random generator outputs a random carrier frequency to the controller;
the current detection device is used for detecting a positioning current and sending the positioning current to the controller;
the bus voltage detection device is used for detecting a bus voltage value and sending the bus voltage value to the controller;
the controller is used for controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the method.
A refrigerator comprising a compressor drive system start-up control apparatus as described above.
The starting control method, the starting control device, the starting control equipment and the refrigerator of the compressor driving system acquire random carrier frequency and initial positioning current; controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain updated positioning current; when the updated positioning current reaches a preset threshold value within a preset positioning duration, obtaining a bus voltage value of a direct current bus side of a compressor driving system; and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram. The frequency adopted in the whole starting process of the compressor driving system is random carrier frequency, the random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near the integral multiple of the carrier frequency, the harmonic distribution on the whole frequency spectrum is evenly spread, the positioning current in the positioning operation is controlled to increase until reaching a preset threshold value, the open-loop operation and the oiling rotating speed closed-loop fixed frequency operation are sequentially controlled according to the bus voltage value obtained by detection and a preset direct current bus voltage waveform diagram, the controller can output enough voltage when the operation is switched to the oiling rotating speed closed-loop fixed frequency operation, the driving system obtains the maximum motor starting torque, the starting speed is high, the starting capability is strong, the whole starting process is very stable, and the starting vibration noise is small.
Drawings
FIG. 1 is a schematic diagram illustrating an exemplary environment in which a start-up control method for a compressor drive system may be implemented;
FIG. 2 is a flow chart of a method for controlling the start-up of a compressor drive system according to one embodiment;
FIG. 3 is a flowchart of a method for controlling the start-up of a compressor drive system according to another embodiment;
FIG. 4 is a flowchart of a method for controlling the start-up of a compressor drive system according to yet another embodiment;
FIG. 5 is a flowchart of a method for controlling the start-up of a compressor drive system according to yet another embodiment;
FIG. 6 is a flow chart illustrating a method for controlling the start-up of a compressor drive system according to one embodiment;
FIG. 7 is a graph of U-phase current waveforms and DC bus voltage waveforms for a positioning phase of operation in accordance with an embodiment;
FIG. 8 is an expanded waveform view of FIG. 7;
FIG. 9 is an expanded waveform view of FIG. 8;
FIG. 10 is a diagram illustrating the magnitude of the read carrier frequency by developing the DC bus voltage waveform in one embodiment;
FIG. 11 is a graph of the U-phase current waveform and the DC bus voltage waveform for the open loop phase and the closed loop fixed frequency upper run phase of one embodiment;
FIG. 12 is a graph illustrating the magnitude of the developed phase current waveform, read carrier frequency, in accordance with one embodiment;
fig. 13 is a block diagram showing a start control device of a compressor driving system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The starting control method of the compressor driving system can be applied to the application environment shown in fig. 1, the compressor driving system without electrolytic capacitor on the bus consists of single-phase uncontrolled rectification, a thin-film capacitor and a three-phase inverter, and C isdcThe capacitor is a film capacitor with a capacitance value of only dozens of microfarads, and replaces an electrolytic capacitor as a direct current bus capacitor, so that the speed regulation of the compressor and the natural power factor correction function can be realized, and the problems of loss, efficiency, service life, reliability and the like can be effectively solved.
In one embodiment, as shown in fig. 2, a method for controlling the start of a compressor driving system is provided, which is exemplified by the application of the method to a controller, and comprises the following steps:
step S110: acquiring random carrier frequency and initial positioning current.
Specifically, the starting operation stage of the compressor driving system is divided into a positioning operation stage, an open-loop operation stage and an oiling rotating speed closed-loop fixed-frequency operation stage. A target PWM switching frequency fpwm1 is set throughout the compressor startup phase, where fpwm1 is a random number, typically, but not exclusively, in the range of 2K to 10K.
Step S120: and controlling the compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain an updated positioning current.
Specifically, the PWM switching frequency used in the whole starting operation stage of the compressor driving system is fpwm1, when the compressor is driven to be in the positioning operation stage, the positioning current is controlled to rise from the initial positioning current in a ramp setting manner, the current detection device detects the positioning current output to the compressor driving system in real time, and the updated positioning current is obtained through detection. When the compressor is in the positioning stage, the random carrier frequency control is adopted, so that the noise vibration is smaller and the compressor is more silent when being driven and started.
Step S130: and when the updated positioning current reaches a preset threshold value within a preset positioning time, detecting to obtain a bus voltage value of the direct current bus side of the compressor driving system.
Specifically, the positioning duration is generally set according to the load requirement, the positioning duration refers to the time used in the whole positioning operation stage, and is generally set within 4s, the positioning duration is a fixed value once determined, and only the system condition and the working condition are different, and the positioning duration is generally set correspondingly. The positioning process is that the rotor position is dragged to a specified position, the motor rotor starts from the specified position, and the positioning time length is set, namely, the actual rotor position is coincident with the rotor position set by the system at the starting time. In this embodiment, the preset positioning duration is set to t1<0.5s, which means that the positioning current must be increased to the preset threshold value within 0.5s according to the preset slope, and the bus voltage at this time is obtained after the positioning current is increased to the preset threshold value, where the bus voltage fluctuates by 2 times of the power frequency cycle.
Step S140: and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
Specifically, the time of switching the positioning operation to the open-loop operation and the time of switching the open-loop operation to the upper oil rotation speed closed-loop fixed frequency operation are determined according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
According to the starting control method, the starting control device, the starting control equipment and the refrigerator of the compressor driving system, the frequency adopted in the whole starting process of the compressor driving system is random carrier frequency, the random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near the integral multiple of the carrier frequency, the harmonic distribution on the whole frequency spectrum is evenly spread, the positioning current during positioning operation is controlled to increase until reaching the preset threshold, the open-loop operation and the oiling rotating speed closed-loop fixed frequency operation are sequentially controlled according to the detected bus voltage value and the preset direct current bus voltage waveform diagram, the controller can output enough voltage when the oiling rotating speed closed-loop fixed frequency operation is switched, the driving system obtains the maximum motor starting torque, the starting speed is high, the starting capacity is strong, the whole starting process is very stable, and the starting vibration noise is small.
In one embodiment, as shown in fig. 3, step S140 includes step S141 and step S142.
Step S141: and when detecting that the bus voltage value reaches a first preset bus voltage threshold value according to a preset direct current bus voltage waveform diagram, controlling the compressor driving system to switch to open-loop operation, and controlling the bus voltage detection device to detect the bus voltage value again to obtain an updated bus voltage value.
Specifically, after the positioning current rises to a set value, the bus voltage is detected in real time, because the direct-current bus voltage and the U-phase current fluctuate in a 2-time power frequency period, the fluctuation frequency is 100Hz, and the fluctuation period time is 1/100 ═ 0.01 seconds, therefore, whether the bus voltage reaches a first preset bus voltage threshold value can be quickly judged, when the bus voltage value is detected to be at the set value (namely the first preset bus voltage threshold value) of the latest fluctuation period of the direct-current bus voltage waveform according to a preset direct-current bus voltage waveform diagram, the moment when the positioning operation is switched to the open-loop operation is judged, the open-loop rotation speed is detected after the compressor driving system is controlled to be switched to the open-loop operation, and after the open-loop rotation speed rises to the preset rotation speed value, the updated bus voltage value is obtained through detection. Further, the bus voltage value does not need to reach the first predetermined bus voltage threshold precisely, and some error may be allowed, i.e. it may be near the first predetermined bus voltage threshold, i.e. it may be slightly smaller than the peak value.
Step S142: and when detecting that the updated bus voltage value reaches a second preset bus voltage threshold value according to a preset direct current bus voltage waveform diagram, controlling the compressor driving system to be switched to the upper oil closed-loop fixed-frequency operation.
Specifically, at this time, if it is detected that the updated bus voltage value is at the set value (i.e., the second preset bus voltage threshold) of the latest fluctuation period of the dc bus voltage waveform, the time of switching to the oiling rotation speed closed loop fixed frequency operation for the open loop operation at this time is determined, so that it is ensured that the controller can output sufficient voltage when switching to the oiling rotation speed closed loop fixed frequency operation, the maximum motor starting torque is obtained, the driving system has a high starting speed, a strong starting capability, and a high success rate. Further, the updated bus voltage value does not need to reach the second preset bus voltage threshold precisely, and some error may be allowed, that is, the updated bus voltage value is near the second preset bus voltage threshold, that is, the updated bus voltage value is slightly smaller than the peak value.
Further, when the system is in an open-loop operation stage and an oiling rotating speed closed-loop fixed frequency operation stage, the open-loop operation time and the oiling rotating speed closed-loop fixed frequency operation time can be inconsistent, and in fact, the system can be set according to actual requirements as long as each time can meet the starting operation requirements.
In one embodiment, as shown in fig. 4, step S140 further includes step S143, step S143: and returning to the step of obtaining the bus voltage value of the direct current bus side of the compressor driving system when the bus voltage value is detected to be less than the first preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram.
Specifically, when it is detected according to the preset dc bus voltage waveform diagram that the bus voltage value has not reached the set value of the latest fluctuation period of the dc bus voltage waveform, that is, the first preset bus voltage threshold value is not reached, the positioning operation is continued and the open-loop operation is not switched to.
In one embodiment, as shown in fig. 4, step S140 further includes step S144, step S144: and when detecting that the updated bus voltage value does not reach the second preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram, returning to the step of detecting again to obtain the updated bus voltage value.
Specifically, when it is detected according to a preset dc bus voltage waveform diagram that the updated bus voltage value has not reached the set value of the latest fluctuation period of the dc bus voltage waveform, that is, the updated bus voltage value has not reached the second preset bus voltage threshold, the open-loop operation is continued and the operation is not switched to the oiling rotation speed closed-loop fixed-frequency operation.
In one embodiment, as shown in fig. 5, step S120 is followed by step S150, step S150: and when detecting that the updated positioning current does not reach the preset threshold value within the preset positioning duration, returning to control the increase of the positioning current output to the compressor driving system, and detecting to obtain the updated positioning current.
Specifically, when it is detected that the positioning current does not rise to the preset threshold, the given current continues to be increased in a slope given manner, and the updated positioning current is obtained through real-time detection.
In one embodiment, step S110 is followed by step 160 and step 170.
Step 160: noise vibration is detected.
Specifically, system noise vibrations are detected during operation of the compressor drive system.
Step 170: when the noise vibration is within a preset noise vibration range, setting the carrier frequency of the next control period as a fixed value; and when the noise vibration is not in the preset noise vibration range, setting the carrier frequency of the next control period as a random number.
Specifically, one control cycle refers to the starting operation stage of the compressor driving system, namely, the starting operation stage comprises a positioning operation stage, an open-loop operation stage and an oiling rotating speed closed-loop fixed-frequency operation stage. The PWM switching frequency is required to be a random number in the whole starting operation stage of the compressor, and only aiming at the stage after the starting operation stage is finished, namely the stage after the oil applying rotating speed closed loop fixed frequency operation stage is finished, if the noise vibration matched with the system meets the requirement, the PWM switching frequency can be set to be a fixed value in the preset noise vibration range; if the noise vibration requirement is not met, the PWM switching frequency is set as a random number, and the random number generator sends out a random number which is in a preset value interval and is used as the next random number.
In one embodiment, as shown in fig. 6, when the compressor is driven in the positioning operation stage, as shown in fig. 7, curve 1 is the U-phase current waveform and curve 2 is the dc bus voltage waveform. The positioning current is ramped up to a set value and the motor positioning duration is set to t1<0.5 s. Fig. 8 is the developed waveform of fig. 7, and it can be seen that both the dc bus voltage and the U-phase current fluctuate with 2 times the power frequency cycle. Fig. 9 and 10 are developed waveforms of fig. 8, and taking fig. 10 as an example, the carrier frequency can be read by using an oscilloscope to read 2 dc bus voltage step periods. The carrier frequency in this application is a random number, so the carrier frequency is also a random number, and ranges from 2K to 10K, which is not excluded.
As shown in fig. 11, when the positioning operation of the compressor is finished, the bus voltage is detected in real time, and when the bus voltage is detected to be near the peak value (or slightly less than the peak value) of the latest fluctuation cycle, the time when the positioning operation is switched to the open loop operation is determined, otherwise, the positioning operation is continued and the open loop operation is not switched. The sudden change of the bus voltage at the switching moment from the vicinity of the peak value can be obviously seen, and the bus voltage drops rapidly along with the sudden addition of the open-loop current, so that the controller can output enough voltage when the operation is switched to the rotating speed closed-loop fixed frequency operation, and the maximum motor starting torque is obtained.
As shown in fig. 11, when the compressor is driven to be in the open-loop operation stage, and the open-loop rotation speed is increased to the set value, the bus voltage is detected in real time, and if the bus voltage is detected to be in the vicinity of the peak value of the latest fluctuation period (or slightly smaller than the peak value), the time when the open-loop operation is switched to the oiling rotation speed closed-loop fixed frequency operation is determined, otherwise, the open-loop operation is continued and the oiling rotation speed closed-loop fixed frequency operation is not switched. The bus voltage at the switching moment is obviously suddenly changed from the position near the peak value, and the bus voltage is seen to rapidly drop along with the rotation speed closed loop and the oil fixed frequency operation.
The magnitude of the carrier frequency in the whole starting operation stage can be checked by developing the phase current waveform with an oscilloscope, as shown in fig. 12, the method is to read the step period of 2 phase currents with the oscilloscope, and then the magnitude of the carrier frequency can be read.
The starting control method of the compressor driving system under the control of the random carrier frequency based on the bus electrolytic-capacitor-free random carrier frequency is characterized in that the frequency adopted in the whole starting process of the compressor driving system is the random carrier frequency, the random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near the integral multiple of the carrier frequency, the harmonic distribution on the whole frequency spectrum is evenly spread, the positioning current during positioning operation is controlled to increase until reaching the preset threshold value, the open-loop operation and the oiling rotating speed closed-loop fixed frequency operation are sequentially controlled according to the detected bus voltage value and the preset DC bus voltage waveform diagram, the controller can output enough voltage when the rotating speed closed-loop fixed frequency operation is switched, the maximum motor starting torque is obtained, the starting speed of the driving system is high, the starting capability is strong, the success rate and the reliability are high, wherein, the starting capability represents the position, the phenomenon of step-out can not appear, the whole starting process is very obvious and very stable, the noise vibration during the positioning operation, the open-loop operation and the closed-loop fixed-frequency operation of the oiling rotating speed of the driving compressor can be effectively reduced, and the problems of large noise vibration, easy starting failure and difficulty in the starting operation stage of the traditional driving control method are solved.
It should be understood that although the various steps in the flow charts of fig. 2-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-6 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 13, a compressor driving system start control device includes a parameter obtaining module 110, a positioning current control module 120, a bus voltage value detection module 130, and an operation switching control module 140, wherein:
a parameter obtaining module 110, configured to obtain a random carrier frequency and an initial positioning current; the positioning current control module 120 is configured to control the compressor driving system to perform positioning operation according to the random carrier frequency and the initial positioning current, control the positioning current output to the compressor driving system to increase, and detect to obtain an updated positioning current; a bus voltage value detection module 130, configured to detect a bus voltage value on a dc bus side of the compressor driving system when it is detected that the updated positioning current reaches a preset threshold within a preset positioning duration; and the operation switching control module 140 is used for controlling the compressor driving system to be sequentially switched to the open-loop operation and the oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
In one embodiment, the operation switching control module comprises an open-loop operation switching unit and an upper closed-loop fixed-frequency operation switching unit, wherein the open-loop operation switching unit is used for controlling the compressor driving system to be switched to open-loop operation when detecting that the bus voltage value reaches a first preset bus voltage threshold value according to a preset direct-current bus voltage waveform diagram, and detecting again to obtain an updated bus voltage value after detecting that the open-loop rotating speed reaches the preset rotating speed value; and the oiling closed-loop fixed-frequency operation switching unit is used for controlling the compressor driving system to be switched to the oiling closed-loop fixed-frequency operation when detecting that the updated bus voltage value reaches a second preset bus voltage threshold value according to a preset direct-current bus voltage waveform diagram.
In another embodiment, the operation switching control module further controls the bus voltage value detection module to detect the bus voltage value when the bus voltage value does not reach the first preset bus voltage threshold value according to the preset dc bus voltage waveform diagram.
In another embodiment, the operation switching control module further includes controlling the open-loop operation switching unit to detect again to obtain the updated bus voltage value when it is detected according to the preset dc bus voltage waveform diagram that the updated bus voltage value does not reach the second preset bus voltage threshold value.
In an embodiment, the positioning current control module further includes a step of controlling the positioning current control module to increase the positioning current output to the compressor driving system again when it is detected that the updated positioning current does not reach the preset threshold value within the preset positioning duration, and detecting to obtain the updated positioning current.
In one embodiment, the parameter obtaining module further comprises a noise vibration detection module and a carrier frequency control module, wherein the noise vibration detection module is used for detecting noise vibration; the carrier frequency control module is used for setting the carrier frequency of the next control period as a fixed value when the noise vibration is within a preset noise vibration range; and when the noise vibration is not in the preset noise vibration range, setting the carrier frequency of the next control period as a random number.
The compressor driving system starting control device under the control of the random carrier frequency based on the bus electrolytic-capacitor-free random carrier frequency has the advantages that the frequency adopted in the whole starting process of the compressor driving system is the random carrier frequency, the random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near the integral multiple of the carrier frequency, the harmonic distribution on the whole frequency spectrum is evenly spread, the positioning current during positioning operation is controlled to increase until reaching the preset threshold value, the open-loop operation and the oiling rotating speed closed-loop fixed frequency operation are sequentially controlled according to the detected bus voltage value and the preset DC bus voltage waveform diagram, the controller can output enough voltage when the rotating speed closed-loop fixed frequency operation is switched, the maximum motor starting torque is obtained, the starting speed of the driving system is high, the starting capability is strong, the success rate and the reliability are high, wherein, the starting capability represents that the position of, the phenomenon of step-out can not appear, and whole starting process is very obvious very steady, can effectively reduce the noise vibration when driving compressor location operation, open loop operation and the closed loop fixed frequency operation of the rotational speed that oils.
For specific limitations of the compressor driving system start control device, reference may be made to the above limitations of the compressor driving system start control method, which are not described herein again. The various modules in the compressor drive system start control apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of: acquiring random carrier frequency and initial positioning current; controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain updated positioning current; when the updated positioning current reaches a preset threshold value within a preset positioning duration, detecting to obtain a bus voltage value of a direct current bus side of a compressor driving system; and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
In one embodiment, the step of controlling the compressor driving system to switch to the open-loop operation and the oiling closed-loop fixed-frequency operation in sequence according to the bus voltage value and the preset dc bus voltage waveform diagram when the computer program is executed by the processor includes: when the bus voltage value is detected to reach a first preset bus voltage threshold value according to a preset direct current bus voltage waveform diagram, controlling a compressor driving system to be switched to open-loop operation, and detecting again to obtain an updated bus voltage value after the open-loop rotating speed is detected to reach a preset rotating speed value; and when detecting that the updated bus voltage value reaches a second preset bus voltage threshold value according to a preset direct current bus voltage waveform diagram, controlling the compressor driving system to be switched to the upper oil closed-loop fixed-frequency operation.
In one embodiment, the computer program, when executed by the processor, controls the compressor driving system to sequentially switch to the open-loop operation and the oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset dc bus voltage waveform diagram, and further includes: and returning to the step of detecting and obtaining the bus voltage value of the direct current bus side of the compressor driving system when the bus voltage value is detected to be less than the first preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram.
In one embodiment, the computer program, when executed by the processor, controls the compressor driving system to sequentially switch to the open-loop operation and the oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset dc bus voltage waveform diagram, and further includes: and when detecting that the updated bus voltage value does not reach the second preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram, returning to the step of detecting again to obtain the updated bus voltage value.
In one embodiment, after the steps of controlling the positioning operation of the compressor driving system according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting an updated positioning current are executed by the processor, the method further includes: and when detecting that the updated positioning current does not reach the preset threshold value within the preset positioning duration, returning to control the increase of the positioning current output to the compressor driving system, and detecting to obtain the updated positioning current.
In one embodiment, the computer program, when executed by the processor, further comprises, after the step of obtaining the random carrier frequency and the initial positioning current: detecting noise vibration; when the noise vibration is within a preset noise vibration range, setting the carrier frequency of the next control period as a fixed value; and when the noise vibration is not in the preset noise vibration range, setting the carrier frequency of the next control period as a random number.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
In one embodiment, the starting control device of the compressor driving system comprises a controller, a current detection device, a bus voltage detection device, a random generator and the compressor driving system, wherein the current detection device, the bus voltage detection device, the random generator and the compressor driving system are all connected with the controller; the current detection device is used for detecting the positioning current and sending the positioning current to the controller; the bus voltage detection device is used for detecting a bus voltage value and sending the bus voltage value to the controller; the controller is used for acquiring random carrier frequency and initial positioning current; controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain updated positioning current; when the updated positioning current reaches a preset threshold value within a preset positioning duration, detecting to obtain a bus voltage value of a direct current bus side of a compressor driving system; and controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram.
For specific limitations of the compressor drive system start control device, reference may be made to the above limitations of the compressor drive system start control method, which are not described in detail herein.
The compressor driving system starting control device under the control of the random carrier frequency based on the bus electrolytic-capacitor-free random carrier frequency has the advantages that the frequency adopted in the whole starting process of the compressor driving system is the random carrier frequency, the random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near the integral multiple of the carrier frequency, the harmonic distribution on the whole frequency spectrum is evenly spread, the positioning current during positioning operation is controlled to increase until reaching the preset threshold value, the open-loop operation and the oiling rotating speed closed-loop fixed frequency operation are sequentially controlled according to the detected bus voltage value and the preset direct current bus voltage waveform diagram, the controller can output enough voltage when the rotating speed closed-loop fixed frequency operation is switched, the maximum motor starting torque is obtained, the starting speed of the driving system is high, the starting capability is strong, the success rate and the reliability are high, wherein the starting capability is strong, the position, the phenomenon of step-out can not appear, and whole starting process is very obvious very steady, can effectively reduce the noise vibration when driving compressor location operation, open loop operation and the closed loop fixed frequency operation of the rotational speed that oils.
In one embodiment, a refrigerator includes the above-described compressor driving system start-up control apparatus.
In the refrigerator, the frequency adopted in the whole starting process of the compressor driving system is random carrier frequency, the random carrier frequency can reduce the carrier frequency and the harmonic energy amplitude near integral multiple thereof, the harmonic distribution on the whole frequency spectrum is evenly spread, the controller can output enough voltage to obtain the maximum motor starting torque when the rotating speed closed loop fixed frequency operation is switched to be the rotating speed closed loop fixed frequency operation by controlling the increase of the positioning current during the positioning operation until the positioning current reaches the preset threshold value and sequentially controlling the operation to enter the open loop operation and the oiling rotating speed closed loop fixed frequency operation according to the detected bus voltage value and the preset direct current bus voltage waveform diagram, the driving system has high starting speed, strong starting capability, high success rate and reliability, wherein the starting capability is strong, the application is accurate for representing the position of a rotor, the step loss phenomenon cannot occur, and the whole starting process is, the noise vibration during the positioning operation, the open-loop operation and the closed-loop fixed-frequency operation of the oiling rotating speed of the driving compressor can be effectively reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A compressor drive system start-up control method, the method comprising:
acquiring random carrier frequency and initial positioning current;
controlling a compressor driving system to operate in a positioning mode according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain updated positioning current;
detecting to obtain a bus voltage value of a direct current bus side of the compressor driving system when the updated positioning current reaches a preset threshold value within a preset positioning duration;
controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram;
after the step of acquiring the random carrier frequency and the initial positioning current, the method further comprises the following steps: detecting noise vibration; when the noise vibration is within a preset noise vibration range, setting the carrier frequency of the next control period as a fixed value; and when the noise vibration is not in the preset noise vibration range, setting the carrier frequency of the next control period as a random number.
2. The method of claim 1, wherein the step of controlling the compressor drive system to sequentially switch to open loop operation and upper closed loop fixed frequency operation according to the bus voltage value and a preset dc bus voltage waveform pattern comprises:
when the bus voltage value reaches a first preset bus voltage threshold value according to a preset direct current bus voltage waveform diagram, controlling the compressor driving system to switch to open-loop operation, and detecting again to obtain an updated bus voltage value after detecting that the open-loop rotating speed reaches a preset rotating speed value;
and when detecting that the updated bus voltage value reaches a second preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram, controlling the compressor driving system to be switched to the upper oil closed-loop fixed frequency operation.
3. The method of claim 2, wherein the step of controlling the compressor drive system to sequentially switch to open loop operation and upper closed loop fixed frequency operation according to the bus voltage value and a preset dc bus voltage waveform pattern further comprises:
and returning to the step of obtaining the bus voltage value of the direct current bus side of the compressor driving system by detection when the bus voltage value is detected to not reach a first preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram.
4. The method of claim 2, wherein the step of controlling the compressor drive system to sequentially switch to open loop operation and upper closed loop fixed frequency operation according to the bus voltage value and a preset dc bus voltage waveform pattern further comprises:
and returning to the step of detecting again to obtain the updated bus voltage value when the updated bus voltage value is detected to not reach a second preset bus voltage threshold value according to the preset direct current bus voltage waveform diagram.
5. The method of claim 1, wherein after the steps of controlling the compressor drive system to operate in a positioning mode based on the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor drive system to increase, and detecting an updated positioning current, further comprising:
and returning to the step of controlling the output of the positioning current to the compressor driving system to increase when the updated positioning current does not reach the preset threshold value within the preset positioning duration, and detecting to obtain the updated positioning current.
6. A compressor drive system start-up control apparatus, characterized by comprising:
the parameter acquisition module is used for acquiring random carrier frequency and initial positioning current;
the positioning current control module is used for controlling the compressor driving system to perform positioning operation according to the random carrier frequency and the initial positioning current, controlling the positioning current output to the compressor driving system to increase, and detecting to obtain an updated positioning current;
the bus voltage value detection module is used for detecting and obtaining a bus voltage value of a direct current bus side of the compressor driving system when the updated positioning current reaches a preset threshold value within a preset positioning duration;
the operation switching control module is used for controlling the compressor driving system to be sequentially switched to open-loop operation and oiling closed-loop fixed-frequency operation according to the bus voltage value and a preset direct-current bus voltage waveform diagram;
the device comprises a parameter acquisition module, a noise vibration detection module and a carrier frequency control module, wherein the parameter acquisition module is followed by the noise vibration detection module and the carrier frequency control module; the carrier frequency control module is used for setting the carrier frequency of the next control period as a fixed value when the noise vibration is within a preset noise vibration range; and when the noise vibration is not in the preset noise vibration range, setting the carrier frequency of the next control period as a random number.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
8. A starting control device of a compressor driving system is characterized by comprising a controller, a current detection device, a bus voltage detection device, a random generator and the compressor driving system which are all connected with the controller,
the random generator outputs a random carrier frequency to the controller;
the current detection device is used for detecting a positioning current and sending the positioning current to the controller;
the bus voltage detection device is used for detecting a bus voltage value and sending the bus voltage value to the controller;
the controller is configured to control the compressor drive system to switch sequentially to an open-loop operation and an upper closed-loop fixed frequency operation according to the method of any one of claims 1-5.
9. A refrigerator comprising the compressor driving system start-up control apparatus as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811352928.0A CN109245657B (en) | 2018-11-14 | 2018-11-14 | Compressor driving system starting control method, device and equipment and refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811352928.0A CN109245657B (en) | 2018-11-14 | 2018-11-14 | Compressor driving system starting control method, device and equipment and refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109245657A CN109245657A (en) | 2019-01-18 |
| CN109245657B true CN109245657B (en) | 2020-01-07 |
Family
ID=65074666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811352928.0A Active CN109245657B (en) | 2018-11-14 | 2018-11-14 | Compressor driving system starting control method, device and equipment and refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109245657B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019027B (en) * | 2019-05-31 | 2021-11-19 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN112019028B (en) * | 2019-05-31 | 2021-12-10 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN110350834B (en) * | 2019-07-10 | 2021-01-15 | 深圳和而泰智能控制股份有限公司 | Motor control method and device |
| CN112350637B (en) * | 2020-09-17 | 2022-07-12 | 珠海格力电器股份有限公司 | Motor noise control method, computer readable storage medium and motor |
| CN112740533B (en) * | 2020-12-24 | 2023-02-21 | 深圳市英威腾电气股份有限公司 | Rapid deceleration control method, system, equipment and medium for asynchronous motor |
| CN113162515A (en) * | 2021-04-29 | 2021-07-23 | 臻驱科技（上海）有限公司 | Bus capacitance current resonance suppression method and system |
| CN115325767B (en) * | 2021-05-10 | 2023-11-21 | 安徽美芝制冷设备有限公司 | Refrigerator and starting method and device of constant-frequency compressor of refrigerator |
| CN114295899A (en) * | 2021-12-30 | 2022-04-08 | 深圳市汇川技术股份有限公司 | Bus capacitance state detection method, device, storage medium and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0159000A2 (en) * | 1984-04-16 | 1985-10-23 | Hitachi, Ltd. | Method and apparatus for controlling PWM inverters |
| CN101449456A (en) * | 2006-08-31 | 2009-06-03 | 三菱电机株式会社 | Electromotor diver and compressor diver |
| CN101478281A (en) * | 2009-01-22 | 2009-07-08 | 邱少杰 | Starting method for brushless DC motor without position sensor based on current feedback |
| CN107222095A (en) * | 2016-03-21 | 2017-09-29 | 美国亚德诺半导体公司 | Mixing soft start for isolated converter |
| CN108662725A (en) * | 2018-03-22 | 2018-10-16 | 奥克斯空调股份有限公司 | A kind of compressor frequency control method, device and air conditioner |
-
2018
- 2018-11-14 CN CN201811352928.0A patent/CN109245657B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0159000A2 (en) * | 1984-04-16 | 1985-10-23 | Hitachi, Ltd. | Method and apparatus for controlling PWM inverters |
| CN101449456A (en) * | 2006-08-31 | 2009-06-03 | 三菱电机株式会社 | Electromotor diver and compressor diver |
| CN101478281A (en) * | 2009-01-22 | 2009-07-08 | 邱少杰 | Starting method for brushless DC motor without position sensor based on current feedback |
| CN107222095A (en) * | 2016-03-21 | 2017-09-29 | 美国亚德诺半导体公司 | Mixing soft start for isolated converter |
| CN108662725A (en) * | 2018-03-22 | 2018-10-16 | 奥克斯空调股份有限公司 | A kind of compressor frequency control method, device and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109245657A (en) | 2019-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109245657B (en) | Compressor driving system starting control method, device and equipment and refrigerator | |
| US20180175752A1 (en) | Motor driving device, as well as refrigerator and device for operating compressor in which said motor driving device is used | |
| JP4561518B2 (en) | A power generation apparatus using an AC excitation synchronous generator and a control method thereof. | |
| EP2863537B1 (en) | Motor control device | |
| US8773060B2 (en) | Brushless motor drive device and drive method | |
| US10056851B2 (en) | System and method for induction motor speed estimation using a soft starter system | |
| EP2398134A2 (en) | Converter lifetime improvement method for doubly fed induction generator | |
| CN103534931A (en) | Inverter device | |
| US20180102723A1 (en) | In-vehicle inverter driving device and in-vehicle fluid machine | |
| CN102969965B (en) | Output control device of electric generator | |
| US9960668B2 (en) | Method and device for controlling start of switching rectifier, and storage medium | |
| Aliamkin et al. | Sensorless control of two-phase switched reluctance drive in the whole speed range | |
| US10014813B2 (en) | Methods for switching on and for switching off an N-phase electric machine in a motor vehicle | |
| JP7322808B2 (en) | Inverter control device and in-vehicle fluid machinery | |
| US10892693B2 (en) | Method for controlling an electric motor including an identification sequence of a transformer | |
| US11211895B2 (en) | Operating an electrical machine | |
| US11239769B2 (en) | Thyristor starter | |
| JPWO2019098004A1 (en) | Power converter | |
| CN109510527A (en) | A kind of synchronous motor startup method and system | |
| JP2008005651A (en) | Power supply device | |
| JP2008172880A (en) | Method and device for driving brushless dc motor | |
| Li et al. | Research on soft starting control strategy for LCI-fed synchronous motor | |
| CN106685289B (en) | Dynamic restriction device and dynamic restriction method for implementing such a device | |
| JP6564640B2 (en) | Engine generator | |
| JP2015151933A (en) | Gas turbine engine stop control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20191203 Address after: 519000 Guangdong city of Zhuhai Province Qianshan Applicant after: GREE ELECTRIC APPLIANCES Inc. OF ZHUHAI Applicant after: Zhuhai Gree Energy Saving & Refrigerating Technology Resarch Center Co., Ltd. Address before: 519000 Guangdong city of Zhuhai province Rooster Hill Road No. 789 building Applicant before: Zhuhai Gree Energy Saving & Refrigerating Technology Resarch Center Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |