Start-up control system and method for variable frequency air conditioner, air conditioner, device and medium

Abstract

This invention discloses a start-up control system, method, air conditioner, equipment, and medium for a variable frequency air conditioner. The system includes: a monitoring module for real-time monitoring of the input voltage of the variable frequency air conditioner; a start-up module for starting the ventilation fan of the variable frequency air conditioner in response to the monitoring module's initial detection of the input voltage; and, after the ventilation fan is started, controlling the start-up of the compressor of the variable frequency air conditioner based on a comparison of the input voltage with a preset threshold range. Through fan-priority start-up and adaptive control based on voltage thresholds, the compressor is automatically started at a limited power when the grid voltage fluctuates, preventing damage to the compressor due to voltage instability. After the voltage stabilizes, the power is gradually increased to the user-set power, achieving a balance between equipment protection and user needs, and extending the compressor's service life.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of intelligent control technology, and more specifically, to a start-up control system, method, air conditioner, equipment, and medium for a variable frequency air conditioner. Background Technology

[0002] Variable frequency air conditioners are widely used in various buildings due to their energy-saving and comfort advantages. The startup process of a variable frequency air conditioner has a significant impact on both compressor lifespan and power grid stability. During startup, the compressor needs to accelerate from a standstill to its operating speed, a process that generates a large starting current, impacting the power grid. Simultaneously, fluctuations in power grid voltage can also affect the normal operation of the compressor, and may even lead to compressor damage.

[0003] Existing inverter air conditioners typically employ fixed start-up curves or simple delayed start-up strategies, which are ill-suited to adapting to dynamic changes in grid voltage. When grid voltage fluctuates significantly, starting the compressor according to a preset method can easily lead to compressor overload or start-up failure; conversely, when grid voltage is stable, an overly conservative start-up strategy can impair the air conditioner's rapid response capability.

[0004] Therefore, how to adaptively control the startup process of a variable frequency air conditioner based on the actual grid voltage is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a start-up control system, method, air conditioner, equipment and medium for a variable frequency air conditioner, which is beneficial to extending the service life of the equipment.

[0006] A start-up control system for a variable frequency air conditioner includes:

[0007] The monitoring module is used to monitor the input voltage of the inverter air conditioner in real time.

[0008] The start-up module, electrically connected to the monitoring module, is used to start the ventilation fan of the variable frequency air conditioner in response to the monitoring module detecting the input voltage for the first time; after the ventilation fan is started, the start-up module controls the compressor of the variable frequency air conditioner to start based on the comparison result of the input voltage and a preset threshold range.

[0009] In one embodiment, the startup module is configured to start the compressor based on a set power received via a user interface when the input voltage is within the preset threshold range; and to ignore the set power received via the user interface and start the compressor with a limited power when the input voltage is outside the preset threshold range, wherein the limited power is less than the set power.

[0010] In one embodiment, the startup module is further configured to: after the compressor is started with limited power, when the input voltage changes from outside the preset threshold range to within the preset threshold range, gradually increase the operating power of the compressor in predetermined steps from the limited power until the set power is reached.

[0011] In one embodiment, the start-up module is configured to pause increasing the operating power or decrease the operating power when the monitoring module detects that the input voltage is again outside the preset threshold range during the process of gradually increasing the operating power of the compressor in predetermined steps.

[0012] In one implementation, it further includes:

[0013] A storage module, electrically connected to both the monitoring module and the startup module, is used to record events detected by the monitoring module where the input voltage is outside the preset threshold range, and events where the startup module starts the compressor with limited power.

[0014] In one embodiment, the monitoring module and the power management chip of the variable frequency air conditioner are located on the same circuit board; or the monitoring module is integrated into the power management chip.

[0015] In one embodiment, the start-up control system is integrated inside the inverter air conditioner; or the start-up control system is independently configured as a controller external to the inverter air conditioner.

[0016] An inverter air conditioner includes a start-up control system for an inverter air conditioner as described in any of the above descriptions.

[0017] A method for starting control of a variable frequency air conditioner, comprising:

[0018] Real-time monitoring of the input voltage of the inverter air conditioner;

[0019] Upon first detection of the input voltage, the ventilation fan of the inverter air conditioner is activated;

[0020] After the ventilation fan is started, the compressor of the variable frequency air conditioner is controlled to start based on the comparison result of the input voltage and the preset threshold range.

[0021] In one embodiment, controlling the start-up of the compressor includes:

[0022] When the input voltage is within the preset threshold range, the compressor is started based on the set power received via the user interface;

[0023] When the input voltage is outside the preset threshold range, the set power received via the user interface is ignored and the compressor is started with a limited power, wherein the limited power is less than the set power.

[0024] In one implementation, it further includes:

[0025] After the compressor is started with limited power, when the input voltage changes from outside the preset threshold range to within the preset threshold range, the operating power of the compressor is gradually increased in predetermined steps, starting from the limited power, until the set power is reached.

[0026] In one embodiment, the method further includes: during the process of gradually increasing the operating power of the compressor in predetermined steps, when the input voltage is detected to be outside the preset threshold range again, pausing the increase of the operating power or reducing the operating power.

[0027] An electronic device includes a processor and a memory; the memory stores an application program executable by the processor for causing the processor to perform the start-up control method for an inverter air conditioner as described above.

[0028] A computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the start-up control method for an inverter air conditioner as described above.

[0029] A computer program product includes a computer program that, when executed by a processor, implements the start-up control method for an inverter air conditioner as described above.

[0030] As can be seen from the above technical solution, in this embodiment of the invention, by prioritizing the activation of the low-power ventilation fan, observing the stability of the power grid voltage in real time during fan operation, and then controlling the compressor's activation based on the comparison result between the input voltage and a preset threshold range, the compressor is ensured to start only when the power grid conditions are suitable. This intelligent startup strategy of starting the fan first, observing the voltage, and then controlling the compressor avoids overload, startup failure, or even damage caused by the compressor blindly starting when the power grid is unstable. It also provides a reliable voltage observation window for compressor startup decisions, significantly improving the compressor's operational safety and service life.

[0031] Furthermore, the embodiments of the present invention automatically ignore the high power demand set by the user when the grid voltage is unstable, and start the compressor with limited power. This protects the compressor from damage and avoids the impact of a complete shutdown on the user experience. After the grid voltage recovers, the operating power of the compressor is gradually increased from the limited power, and the voltage is continuously monitored during the increase. If the voltage becomes unstable again, the increase is paused or the power is appropriately reduced, achieving a smooth transition and dynamic closed-loop protection, avoiding secondary impacts on the grid and compressor caused by sudden power increases.

[0032] Furthermore, the embodiments of the present invention record voltage anomaly events and restricted start-up events through a storage module, providing data support for equipment fault diagnosis, maintenance analysis, and warranty certification, thereby further enhancing the practical value of the system. Attached Figure Description

[0033] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will make the above and other features and advantages of the present invention more apparent to those skilled in the art. In the drawings:

[0034] Figure 1 This is an exemplary structural diagram of the start-up control system of a variable frequency air conditioner according to an embodiment of the present invention.

[0035] Figure 2 This is an exemplary flowchart of a start-up control method for a variable frequency air conditioner according to an embodiment of the present invention.

[0036] Figure 3 This is an exemplary schematic diagram of the start-up control process of a variable frequency air conditioner according to an embodiment of the present invention.

[0037] Figure 4 This is an exemplary schematic diagram of the start-up control topology of a variable frequency air conditioner according to an embodiment of the present invention.

[0038] Figure 5 This is an exemplary structural diagram of an electronic device according to an embodiment of the present invention.

[0039] The reference numerals in the attached figures are as follows:

[0040] label meaning 10 Start-up control system 11 Monitoring module 12 Startup module 101～103 step 20～28 step 231～232，271～272 Sub-step 40 power supply 50 Start-up control system 60 user interface 70 Building air conditioning system 41 Power grid input 42 Main electrical box 51 voltage sensor 52 controller 53 Power Management Unit 61 Building Management System 62 Remote monitoring 63 Local control board 71 Control Interface 72 Compressor motor 73 Variable frequency driver 74 Fan motor 500 electronic devices 501 processor 502 memory Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the following embodiments are provided to further illustrate the invention in detail. The nouns and pronouns referring to "person" in this patent application are not limited to specific genders.

[0042] For the sake of brevity and intuitiveness, the following description uses several representative embodiments to illustrate the solution of the present invention. Numerous details in the embodiments are only used to aid in understanding the solution of the present invention. However, it is obvious that the technical solution of the present invention can be implemented without being limited to these details. To avoid unnecessarily obscuring the solution of the present invention, some embodiments are not described in detail, but only a framework is given. In the following text, "comprising" means "including but not limited to," and "according to..." means "at least according to..., but not limited to only according to...". Due to Chinese language habits, unless the quantity of a component is specifically indicated below, it means that the component can be one or more, or can be understood as at least one.

[0043] The existing start-up control methods for inverter air conditioners mainly have the following problems:

[0044] First, it lacks the ability to respond in real time to fluctuations in grid voltage. Taking the morning rush hour in commercial buildings as an example, a large number of variable frequency air conditioning units start up at the same time, causing drastic fluctuations in grid voltage. However, traditional variable frequency air conditioning units still start the compressor according to a preset fixed curve, which can easily cause compressor overload, start-up failure, or even damage.

[0045] Second, relying on external voltage stabilization equipment (such as voltage regulators, UPS, etc.) to deal with voltage fluctuations not only increases system costs and installation complexity, but also represents a passive response and makes it difficult to solve the problem of compressor startup safety when the voltage is unstable.

[0046] Third, while delayed start-up strategies can stagger the start-up times of some devices, they cannot dynamically adjust the start-up power based on real-time voltage conditions. For example, when the grid voltage is already unstable during the morning rush hour, the compressor may still start at full power after a delayed start, exacerbating damage to the compressor.

[0047] Fourth, there is a lack of priority management between user settings and equipment protection. When voltage fluctuates, the high power demand set by the user is still executed first, causing the compressor to operate under harsh conditions for a long time, which significantly shortens the service life of the equipment.

[0048] To address the shortcomings of the existing technologies, this invention proposes a start-up control system and method for a variable frequency air conditioner. The core idea is to adaptively control the compressor start-up process based on the grid voltage, ensuring compressor safety while also taking into account user-defined requirements.

[0049] Specifically, this invention uses a monitoring module to acquire the input voltage of the inverter air conditioner in real time. Upon first detection of the input voltage, it prioritizes starting the low-power ventilation fan, using the fan's startup period to observe the stability of the mains voltage. Subsequently, the startup module determines the compressor's startup method based on a comparison between the current monitored input voltage (which may differ from the initially detected input voltage) and a preset threshold range. Specifically: when the input voltage is within the preset threshold range (i.e., the mains are stable), the compressor starts at the power setting received by the user via the interface, ensuring the inverter air conditioner responds quickly to operational needs; when the input voltage is outside the preset threshold range (i.e., the mains are unstable), the user-set high power requirement is ignored, and the compressor is forced to start at a limited power level below the set power, preventing damage caused by the compressor being forced to start at full power under adverse mains conditions.

[0050] In addition, after the compressor starts at limited power, the input voltage is continuously monitored. Once the voltage recovers to the preset threshold range, the start-up module gradually increases the compressor's operating power from the limited power level in predetermined steps until it reaches the user-set normal power, achieving a smooth transition. If the voltage becomes unstable again during the power increase process, the power increase will be paused or appropriately reduced, forming a complete closed-loop protection mechanism.

[0051] Through the above methods, the frequency converter system has the intelligent control capability to adapt to power grid fluctuations. When the power grid is in good condition, it operates at full power to ensure the operating effect, and when the power grid is in poor condition, it operates at low power to protect the compressor. This not only solves the problem that the compressor is easily damaged by voltage fluctuations in traditional solutions, but also avoids the impact of complete shutdown on user experience, achieving a balance between equipment life and user needs.

[0052] Figure 1 This is an exemplary structural diagram of the start-up control system of a variable frequency air conditioner according to an embodiment of the present invention. Figure 1 As shown, the start control system 10 includes a monitoring module 11 for real-time monitoring of the input voltage of the variable frequency air conditioner; a start module 12, electrically connected to the monitoring module, for starting the ventilation fan of the variable frequency air conditioner in response to the monitoring module first detecting the input voltage; and after the ventilation fan is started, controlling the start of the compressor of the variable frequency air conditioner based on the comparison result of the input voltage and a preset threshold range.

[0053] The monitoring module 11 is used to monitor the input voltage of the inverter air conditioner in real time. In one embodiment, the monitoring module 11 is implemented in hardware, with its input terminal electrically connected to the power input terminal of the inverter air conditioner. It can acquire parameters such as the instantaneous value, effective value, and fluctuation amplitude of the input voltage in real time. This can be achieved through a voltage sensor, sampling circuit, or dedicated voltage monitoring chip, and is mounted on the power circuit board of the air conditioner. In another embodiment, the monitoring module 11 is implemented using a combination of hardware and software, consisting of a voltage sampling circuit and a voltage monitoring program running in the main control chip. The input terminal of the voltage sampling circuit is electrically connected to the power input terminal of the inverter air conditioner and is responsible for sampling and acquiring the voltage signal. The voltage monitoring program in the main control chip is responsible for processing and analyzing the voltage signal to achieve real-time voltage monitoring. The monitoring module 11 continuously outputs the monitored voltage signal to the start-up module 12.

[0054] The startup module 12 can be implemented in hardware, such as logic circuits, programmable controllers, or dedicated control chips; it can also be implemented in software, such as a control program running in the main control chip of the inverter air conditioner. The startup module 12 can be integrated into the main control board of the inverter air conditioner, sharing a processor with other control functions of the inverter air conditioner; it can also be set up as an independent controller for upgrading existing inverter air conditioners. The startup module 12 has a preset threshold range, which can be set according to power grid standards and equipment characteristics. The startup module 12 is electrically connected to the monitoring module 11 and is used to start the ventilation fan of the inverter air conditioner in response to the monitoring module 11's initial detection of the input voltage; after the ventilation fan is started, the compressor of the inverter air conditioner is controlled to start based on the comparison result between the input voltage and the preset threshold range.

[0055] Specifically, when the inverter air conditioner is powered on, the moment the monitoring module 11 detects the presence of input voltage, the starting module 12 is triggered and immediately sends a start command to the drive circuit of the ventilation fan, causing the ventilation fan to start running. As a low-power load, the start of the ventilation fan will not cause a significant impact on the power grid. After the ventilation fan starts, the starting module 12 does not immediately start the compressor, but continuously receives the voltage data output in real time from the monitoring module 11 and compares the current voltage with an internally preset threshold range. This threshold range is the allowable voltage fluctuation range set according to power grid standards and compressor safety operation requirements. The starting module 12 determines the compressor's start-up timing and method based on the comparison result. Through the above method, the starting module 12 realizes the start-up control logic of starting the fan first, observing the voltage, and then controlling the compressor, ensuring that the compressor start-up process is adapted to the power grid status.

[0056] In one embodiment, the start-up module 12 is configured to start the compressor based on a set power received via a user interface when the input voltage is within a preset threshold range; and to ignore the set power received via the user interface and start the compressor with a limited power when the input voltage is outside the preset threshold range, wherein the limited power is less than the set power.

[0057] Here, the startup module 12 is configured to implement a more refined startup control strategy. Specifically, the startup module 12 internally stores a preset threshold range, which defines the normal fluctuation range of the mains voltage. Simultaneously, the startup module 12 is communicatively connected to the air conditioner's user interface and can receive the operating power (hereinafter referred to as "set power") set by the user via the interface. This set power reflects the user's demand for cooling or heating capacity under the current operating conditions. In the above embodiment, the startup module 12 executes the following two different control modes based on the comparison result between the input voltage and the preset threshold range:

[0058] First mode: Normal startup mode

[0059] When the input voltage data output by the monitoring module 11 indicates that the current voltage is within a preset threshold range, the start-up module 12 determines that the power grid is stable. In this case, the start-up module 12 starts the compressor according to the power requirements set by the user, using the power setting received by the user through the interface. The compressor operates normally at the set power, enabling the air conditioner to quickly achieve the cooling or heating effect expected by the user, meeting the comfort requirements under normal usage scenarios.

[0060] Second Mode: Protected Boot Mode

[0061] When the input voltage data output by the monitoring module 11 indicates that the current voltage is outside the preset threshold range, the start-up module 12 determines that the power grid is unstable. In this case, the start-up module 12 activates a protection mechanism: ignoring the power setting received by the user through the interface, it starts the compressor at a limited power. This limited power is usually set to be less than the power set by the user, for example, 30% to 50% of the rated power. This means that even if the user sets a higher operating power, the start-up module 12 will force the compressor to start at a lower power when the power grid is unstable, avoiding overload or damage to the compressor caused by forcibly starting it at full power under severe power grid conditions.

[0062] As can be seen, the embodiments of the present invention clearly prioritize equipment protection over user-defined operating requirements when the power grid is unstable. The startup module 12 automatically ignores the user's high-power settings and forces startup at limited power, preventing users from unknowingly placing the compressor under dangerous conditions in pursuit of cooling effects. Furthermore, the two modes automatically switch based on the same voltage judgment criterion, requiring no user intervention. The user's settings on the operating interface remain unchanged, and the system automatically adjusts the actual operating power in the background according to the power grid status, ensuring equipment safety without increasing the user's operational burden. Moreover, when the power grid is unstable, the compressor is not completely prohibited from starting but maintains low-load operation at limited power. This allows the air conditioner to still provide basic cooling or heating capacity under adverse power grid conditions, avoiding the discomfort caused by a complete shutdown and achieving a balance between equipment protection and user experience. In addition, by avoiding full-power startup of the compressor when the voltage is unstable, the electrical and mechanical shocks experienced by the compressor are significantly reduced, thereby effectively extending the compressor's service life and reducing equipment replacement frequency and maintenance costs.

[0063] In one embodiment, the start-up module 12 is further configured to: after starting the compressor with limited power, when the input voltage changes from outside the preset threshold range to within the preset threshold range, gradually increase the operating power of the compressor from the limited power at predetermined step sizes until a set power is reached. In this embodiment, the start-up module 12 is also configured to implement a gradual power recovery function after voltage recovery. When the start-up module 12 starts the compressor with limited power because the input voltage is outside the preset threshold range, the monitoring module 11 continues to monitor the changes in the input voltage in real time. The start-up module 12 continues to receive the voltage data output by the monitoring module 11 and continuously judges the state of the input voltage relative to the preset threshold range. When the monitoring module 11 detects that the input voltage changes from outside the preset threshold range to within the preset threshold range, it indicates that the grid voltage has recovered from an unstable state to a stable range. At this time, the start-up module 12 determines that the power recovery condition is met and starts the gradual power recovery process. The start-up module 12 gradually increases the operating power of the compressor from the currently operating limited power at predetermined step sizes. For example, the step size can be preset according to system design requirements, such as 10% of the set power. After each power increase, the start-up module 12 maintains operation for a period of time while the monitoring module 11 continuously confirms whether the voltage remains stable within the threshold range. If the voltage remains stable, the start-up module 12 increases the power by one level again, repeating this process until the compressor's operating power reaches the set power received by the user through the interface.

[0064] By gradually increasing the power output as described above, the compressor's power smoothly transitions from the limited value to the user-set normal value, avoiding secondary shocks to the power grid and compressor caused by sudden power increases. It is evident that this invention achieves complete closed-loop control, automatically reducing power for protection when the voltage is unstable and automatically increasing power to restore operation after voltage recovery. This ensures that the compressor always operates at a power level adapted to the power grid conditions, guaranteeing both equipment safety and user experience.

[0065] In one embodiment, the start-up module 12 is used to pause increasing the operating power or reduce the operating power of the compressor when the monitoring module 11 detects that the input voltage is again outside the preset threshold range during the process of gradually increasing the operating power of the compressor in predetermined steps.

[0066] As can be seen, the start-up module 12 is also configured with a back-off protection function during the power gradual recovery process. While the start-up module 12 is gradually increasing the compressor's operating power in predetermined steps, the monitoring module 11 continues to monitor changes in the input voltage in real time. If, during this process, the monitoring module 11 detects that the input voltage is again outside the preset threshold range, it indicates that new fluctuations or instability have occurred in the power grid during the recovery process. At this time, the start-up module 12 immediately responds, suspending the current power increase operation to avoid further increasing the compressor load if the power grid becomes unstable again. In one embodiment, the start-up module 12 can not only suspend the increase in operating power but also actively reduce the compressor's operating power appropriately, for example, by backing down one step or directly reducing it to the limited power, to further reduce the compressor's burden on the power grid and its own impact. When the monitoring module 11 detects again that the input voltage has recovered to the preset threshold range and stabilized, the start-up module 12 can restart the process of gradually increasing the power. Through the backoff protection mechanism, the embodiments of the present invention form a complete dynamic closed-loop control during the power recovery process. When the voltage is stable, the power is increased; when the voltage is unstable, the power is stopped or reduced. This ensures that the compressor continues to operate within a safe power range that is compatible with the power grid conditions, thus avoiding cumulative damage to the compressor caused by repeated fluctuations in the power grid.

[0067] In one embodiment, the system 10 further includes: a storage module ( Figure 1 (Not shown in the image), which is electrically connected to the monitoring module 11 and the start-up module 12 respectively, and is used to record events where the input voltage detected by the monitoring module 11 is outside the preset threshold range, and events where the start-up module 12 starts the compressor with limited power.

[0068] Specifically, the storage module records two types of key events: the first type is the event where the input voltage detected by the monitoring module 11 is outside the preset threshold range, that is, the time, duration, and amplitude of voltage fluctuations in the power grid; the second type is the event where the starting module 12 starts the compressor with limited power in response to voltage fluctuations, including the time of occurrence of limited power start, the limited power value, and the duration.

[0069] The storage module can be implemented in various hardware forms, such as non-volatile memory (e.g., Flash, EEPROM), hard disk, or cloud storage. During the operation of system 10, whenever the monitoring module 11 detects that the voltage exceeds the threshold range, or the startup module 12 performs a power-limited startup operation, the relevant data is automatically written to the storage module for storage.

[0070] By incorporating a storage module, this invention achieves traceability of operational data. These records can be used for various purposes: in the event of equipment failure, maintenance personnel can retrieve historical data from the storage module to analyze whether the failure is related to grid voltage fluctuations; in equipment warranty or claims scenarios, these records can serve as valid proof of equipment operation under abnormal grid conditions; for air conditioning system managers, these records can also be used for statistical analysis of grid quality and optimization of equipment maintenance plans. Through the storage module, this invention not only provides real-time protection capabilities but also offers post-event analysis and traceability capabilities, further enhancing the system's practical value.

[0071] In one embodiment, the monitoring module 11 and the power management chip of the variable frequency air conditioner are located on the same circuit board; or the monitoring module 11 is integrated into the power management chip.

[0072] It can be seen that the monitoring module 11 and the power management chip of the variable frequency air conditioner can be integrated in different ways.

[0073] In the first approach, the monitoring module 11 and the power management chip of the inverter air conditioner are located on the same circuit board. Specifically, the monitoring module 11, as an independent component or sub-circuit, is laid out together with the power management chip on the air conditioner's power circuit board. The two are electrically connected through printed circuits on the circuit board, share the same power supply and ground wire, and can exchange data using the communication interface on the circuit board. This integration method has the advantages of flexible design, ease of debugging and maintenance. The monitoring module 11 can be equipped with voltage sampling elements of different specifications as needed to adapt to the voltage monitoring requirements of different air conditioner models.

[0074] In the second approach, the monitoring module 11 is directly integrated into the power management chip. Specifically, the functional modules of the monitoring module 11 are embedded in the internal circuitry of the power management chip, becoming a functional unit of the chip. In this case, the monitoring module 11 and the power management chip share the same semiconductor substrate, pins, and internal bus, achieving voltage monitoring without the need for additional external components. This integration method offers higher integration density, reduces circuit board space, lowers system costs, and improves signal transmission reliability and interference immunity due to reduced external connections.

[0075] The above integration methods can be flexibly selected according to product design and cost requirements. Regardless of board-level integration or chip-level integration, the monitoring module 11 can realize the function of real-time monitoring of input voltage and work together with the start-up module 12 to complete the intelligent start-up control of the variable frequency air conditioner.

[0076] In one embodiment, the start control system 10 is integrated inside the inverter air conditioner; or, the start control system 10 is independently configured as an external controller connected to the inverter air conditioner.

[0077] It is evident that the start control system 10 can adopt various product forms to meet the needs of different application scenarios.

[0078] In the first configuration, the start-up control system 10 is integrated within the inverter air conditioner. Specifically, the monitoring module 11, the start-up module 12, and the optional storage module are integral components of the entire air conditioner unit and are pre-installed on the air conditioner's control circuit board or power circuit board before the air conditioner leaves the factory. Together with other functional modules of the air conditioner (such as the main control chip, drive circuit, power management unit, etc.), they constitute a complete air conditioning control system. In this configuration, no additional installation is required by the user; the start-up control system 10 automatically operates upon the start of the air conditioner, achieving intelligent control of the compressor start-up process. This integrated configuration is suitable for newly manufactured air conditioning equipment, enabling factory-installed air conditioners to have grid-adaptive start-up capabilities.

[0079] In the second configuration, the start-up control system 10 is independently configured as an external controller connected to the inverter air conditioner. Specifically, the monitoring module 11, the start-up module 12, and an optional storage module are encapsulated in a separate control box or module. This controller has independent power interfaces, voltage monitoring interfaces, and control output interfaces. In use, the voltage monitoring interface of the controller is electrically connected to the power input terminal of the air conditioner, and the control output interface is connected to the control circuit of the air conditioner, thus enabling the upgrade of existing air conditioners. This external configuration is particularly suitable for older air conditioning equipment already in use. It eliminates the need to replace the entire air conditioner unit; simply adding this controller enables intelligent start-up control functionality, reducing upgrade costs for users.

[0080] Through the above-described product forms, the embodiments of the present invention can provide flexible options for different user groups. Regardless of the form adopted, the start-up control system 10 can achieve the same intelligent start-up control function, effectively protecting the compressor from damage caused by power grid voltage fluctuations.

[0081] This invention also provides a variable frequency air conditioner, which includes, as described above... Figure 1 The variable frequency air conditioner includes a start-up control system 10. Specifically, the system incorporates a monitoring module, a start-up module, and an optional storage module. The input terminal of the monitoring module is electrically connected to the power input terminal of the air conditioner. The start-up module is electrically connected to the monitoring module and also connected to the air conditioner's ventilation fan and compressor drive circuit. During air conditioner operation, the start-up control system automatically executes the aforementioned start-up control, achieving adaptive control of the compressor start-up process. The variable frequency air conditioner incorporating this start-up control system possesses grid adaptive start-up capability, automatically protecting the compressor during grid voltage fluctuations, extending equipment lifespan, and simultaneously meeting user-defined operating requirements.

[0082] The present invention also proposes a start-up control method for variable frequency air conditioners. Figure 2 This is an exemplary flowchart of a start-up control method for a variable frequency air conditioner according to an embodiment of the present invention. This method can be executed by the aforementioned start-up control system 10, specifically by the start-up module in the start-up control system in conjunction with the monitoring module. Figure 2 As shown, the method includes:

[0083] Step 101: Monitor the input voltage of the inverter air conditioner in real time.

[0084] Step 102: In response to the first detection of the input voltage, the ventilation fan of the inverter air conditioner is started.

[0085] Step 103: After the ventilation fan is started, the compressor of the variable frequency air conditioner is controlled to start based on the comparison result of the input voltage and the preset threshold range.

[0086] In one embodiment, controlling the start-up of the compressor includes: starting the compressor based on a set power received via a user interface when the input voltage is within a preset threshold range; and ignoring the set power received via the user interface and starting the compressor with a limited power when the input voltage is outside the preset threshold range, wherein the limited power is less than the set power.

[0087] In one embodiment, the method further includes: after starting the compressor with limited power, when the input voltage changes from outside the preset threshold range to within the preset threshold range, starting from the limited power, gradually increasing the operating power of the compressor in predetermined steps until the set power is reached.

[0088] In one embodiment, the method further includes: during the process of gradually increasing the operating power of the compressor in predetermined steps, when the input voltage is detected to be outside the preset threshold range again, pausing the increase of operating power or reducing the operating power.

[0089] Figure 3 This is an exemplary schematic diagram of the start-up control process of a variable frequency air conditioner according to an embodiment of the present invention. Figure 3 As shown, the process includes:

[0090] Step 20: Connect the main power supply of the inverter air conditioner and start the control system.

[0091] Step 21: Upon first detection of the input voltage, immediately start the ventilation fan.

[0092] Step 22: Continue to monitor the input voltage in real time and determine whether the input voltage is within the threshold range; if yes (corresponding to the "Y" branch), proceed to step 27; otherwise (corresponding to the "N" branch), proceed to step 23 and subsequent steps.

[0093] Step 23: Enter protection start mode. In protection start mode, execute sub-steps 231 and 232. Sub-step 231: Ignore the power setting received by the user via the interface; Sub-step 232: Start the compressor with limited power. Sub-steps 231 and 232 are performed simultaneously.

[0094] Step 24: In protection start-up mode, continue to monitor the input voltage in real time.

[0095] Step 25: Determine whether the input voltage has changed from outside the threshold range to within the threshold range. If yes (corresponding to the "Y" branch), proceed to step 26 and its subsequent steps; otherwise (corresponding to the "N" branch), proceed to step 28.

[0096] Step 26: Starting from the currently limited operating power, gradually increase the compressor's operating power in predetermined step sizes. After each power increase, continue monitoring the input voltage to confirm whether the voltage remains stable within the threshold range. If the input voltage is detected to be outside the threshold range again during the gradual increase, pause the power increase or appropriately reduce the operating power, and continue monitoring until the voltage stabilizes again before restarting the gradual increase. Repeat this process until the compressor's operating power reaches the set power received by the user through the interface.

[0097] Step 27: Enter normal startup mode and end this process. In normal startup mode, execute sub-steps 271 and 272. Sub-step 271: Obtain the set power received by the user via the interface; Sub-step 272: Start the compressor at the set power.

[0098] Step 28: Maintain the protection start mode, continue monitoring the input voltage, and return to step 24.

[0099] The following example, using a variable frequency air conditioner in a building, illustrates the implementation of this invention. Figure 4 This is an exemplary schematic diagram of the start-up control topology of a variable frequency air conditioner according to an embodiment of the present invention. Figure 4 As shown, the topology includes a power supply 40, a start-up control system 50, a user interface 60, and a building air conditioning system 70.

[0100] The power source 40 includes a mains power input 41 and a main distribution box 42. The mains power input 41 is used to draw power from the public power grid into the building; the main distribution box 42 serves as the central hub of the building's power distribution system, receiving power from the mains power input 41 and distributing it to the air conditioning system 70 and other electrical equipment.

[0101] The start-up control system 50 includes a voltage sensor 51, a controller 52, and a power management unit 53. The input terminal of the voltage sensor 51 is electrically connected to the main electrical box 42 for real-time monitoring of the input voltage. The controller 52 is electrically connected to the voltage sensor 51 and receives the voltage data output by the voltage sensor 51. The power management unit 53 is electrically connected to the controller 52 and controls the power output of the air conditioning system 70 according to the instructions from the controller 52.

[0102] The user interface 60 includes a building management system 61, a remote monitoring system 62, and a local control panel 63. Users can set parameters such as the operating power of the air conditioner through the building management system 61, the remote monitoring system 62, or the local control panel 63. These user settings are transmitted to the control interface 71 of the air conditioning system 70.

[0103] The building air conditioning system 70 includes a control interface 71, a compressor motor 72, a variable frequency drive 73, and a fan motor 74. The control interface 71 is electrically connected to both the building management system 61 and the local control board 63, receiving user-set operating parameters. The control interface 71 can also be electrically connected to the controller 52, transmitting user-set operating parameters to the controller 52. The variable frequency drive 73 is electrically connected to the compressor motor 72 and drives the compressor; the fan motor 74 drives the ventilation fan. The power management unit 53 is electrically connected to the variable frequency drive 73 and controls the power of the compressor motor 72 by controlling the variable frequency drive 73.

[0104] When the air conditioning system 70 receives a start command, the voltage sensor 51 begins to monitor the input voltage in real time. At the instant the air conditioner is powered on, the voltage sensor 51 detects the presence of the input voltage for the first time and notifies the controller 52 of this event. In response to the initial detection of the input voltage, the controller 52 immediately sends a start command to the fan motor 74, causing the ventilation fan to start running, while the compressor remains off.

[0105] After the ventilation fan starts, the controller 52 does not immediately start the compressor. Instead, it continuously receives voltage data output from the voltage sensor 51 and compares the current voltage with an internally preset threshold range. This threshold range can be set according to power grid standards and equipment characteristics, such as -10% to +15% of the rated voltage.

[0106] If the input voltage detected by voltage sensor 51 remains within the preset threshold range, it indicates that the power grid is stable, and controller 52 enters normal startup mode. In normal startup mode, controller 52 obtains the operating power set by the user through control interface 71 via building management system 61, remote monitoring 62, or local control board 63, and sends instructions to power management unit 53, causing power management unit 53 to control variable frequency drive 73 to start compressor motor 72 at the power set by the user.

[0107] If the input voltage detected by voltage sensor 51 is outside the preset threshold range, indicating that the power grid is unstable, controller 52 enters the protection start-up mode. In the protection start-up mode, controller 52 ignores the user-set operating power and starts the compressor with limited power. Specifically, controller 52 sends a command to power management unit 53, causing power management unit 53 to control variable frequency drive 73 to start compressor motor 72 with limited power less than the user-set power. The limited power can be preset to 30% to 50% of the rated power.

[0108] During compressor operation at limited power, voltage sensor 51 continuously monitors changes in the input voltage. When voltage sensor 51 detects that the input voltage has shifted from outside the preset threshold range to within the preset threshold range, it indicates that the power grid has stabilized. At this time, controller 52 initiates a gradual recovery process, starting from the currently operating limited power and gradually increasing the compressor's operating power in predetermined steps. After each power increase, the system maintains operation for a period of time, while voltage sensor 51 continuously confirms whether the voltage remains stable within the threshold range. If, during the gradual increase, voltage sensor 51 again detects that the input voltage is outside the threshold range, controller 52 pauses the power increase or appropriately reduces the operating power, and resumes the gradual increase once the voltage stabilizes again. This process is repeated until the compressor's operating power reaches the user-set power value.

[0109] Through the above method, the embodiments of the present invention realize adaptive start-up control based on the grid voltage state, ensuring that the compressor operates at full power only when the grid is stable, operates with limited power protection when the grid fluctuates, and smoothly transitions to the user-set power after the grid is restored, effectively extending the service life of the compressor.

[0110] The following section uses a centralized inverter air conditioner installed in a commercial building as an example, combined with a typical working scenario, to describe in detail the specific implementation process of the embodiments of the present invention.

[0111] Scenario: At 7:55 a.m. on a summer weekday, the property manager sets the air conditioner to full-power cooling mode via the user interface, setting the power to 100% of the rated power. At this time, the morning rush hour is approaching, and a large number of air conditioning units in the surrounding area start up one after another, causing the power grid voltage to fluctuate.

[0112] Step 1: Power on the system and start the fan

[0113] At 7:55 AM, the building management system sends a start-up command to the air conditioner, connecting the main power supply and initiating the control system's operation. The monitoring module's input is electrically connected to the air conditioner's power input. Upon the moment the air conditioner is powered on, it detects the presence of input voltage for the first time and immediately notifies the start-up module. Responding to the monitoring module's initial detection of the input voltage, the start-up module immediately sends a start-up command to the ventilation fan's drive circuit, causing the fan to begin operating while the compressor remains off. As a low-power load, the fan's startup does not significantly impact the power grid and simultaneously creates initial airflow conditions for the subsequent compressor startup.

[0114] Step 2: Voltage observation and status judgment

[0115] After the ventilation fan starts, the start-up module does not immediately start the compressor, but instead enters a brief voltage observation period. The monitoring module continuously monitors changes in the input voltage in real time and outputs the voltage data to the start-up module. The start-up module has a preset threshold range, for example, set to -10% to +15% of the rated voltage of 220V, i.e., 198V to 253V. The start-up module compares the received real-time voltage data with this threshold range. As the time approaches 8:00 AM, the air conditioning equipment in surrounding buildings starts up one after another, and the power grid load gradually increases. The monitoring module detects that the input voltage begins to fluctuate. By 8:00 AM, the voltage has dropped to 195V, below the lower limit of the threshold range of 198V. Based on this, the start-up module determines that the current input voltage is outside the preset threshold range, and the power grid is unstable.

[0116] Step 3: Compressor protection start-up

[0117] Based on the above judgment, the start-up module executes the protective start-up mode. At this time, even though the user has set a 100% full-power operation requirement, the start-up module ignores this setting and starts the compressor at a limited power. For example, the limited power is set to 40% of the rated power. The start-up module sends a start command to the compressor's drive circuit, causing the compressor to start operating at 40% limited power. Although the air conditioner fails to achieve the user-set full-power cooling effect, it can still maintain basic cooling capacity at a lower power, avoiding a complete shutdown due to voltage instability. Simultaneously, the storage module automatically records this event: the monitoring module detects that the input voltage is outside the threshold range, and the start-up module started the compressor at 40% limited power.

[0118] Step 4: Voltage Recovery Monitoring

[0119] While the compressor operated at 40% power limitation, the monitoring module continuously monitored changes in the input voltage in real time. At 8:15 AM, as the first wave of the morning rush hour subsided, the power grid gradually stabilized. The monitoring module detected that the input voltage had rebounded to 205V, returning to the threshold range of 198V to 253V. The startup module determined that the input voltage had shifted from outside the preset threshold range to within it, thus meeting the power recovery conditions.

[0120] Step 5: Gradually restore power

[0121] The startup module then initiates a gradual recovery process, starting from the current 40% power limitation and gradually increasing the compressor's operating power in 10% increments. After each power increase, the system maintains operation for a period while the monitoring module continuously confirms that the voltage remains stable within the threshold range. Once the voltage is confirmed to be stable, the startup module increases the power by one level, repeating this process to gradually increase the power from 40% to 50%, 60%, 70%, 80%, and 90%, until reaching the user-set 100% full power at 8:30 AM.

[0122] During the aforementioned gradual recovery process, if the monitoring module detects that the voltage fluctuates again and exceeds the threshold range, the start-up module immediately executes the rollback protection. For example, assuming that when the power is increased to 70%, the monitoring module detects that the voltage drops to 196V again, below the lower threshold of 198V, the start-up module will immediately pause the power increase and appropriately reduce the operating power as needed, such as rolling back from 70% to 60% or directly reducing to the 40% restricted power. Once the monitoring module detects that the voltage has recovered to the threshold range and stabilized, the start-up module will restart the gradual increase process from the current power. This mechanism ensures that the compressor always operates within a safe power range under repeated grid fluctuations.

[0123] Throughout the operation, the storage module continuously records critical events, including the voltage dropping below the threshold to 195V at 8:00 AM, triggering the compressor startup module to begin operating at 40% power, and the power recovery process from 8:15 AM to 8:30 AM. If backoff protection occurs, the relevant events are also recorded. These records can be used for subsequent fault diagnosis, maintenance analysis, or warranty verification. For example, if the compressor fails in the future, maintenance personnel can retrieve historical data from the storage module to analyze whether the fault is related to grid voltage fluctuations or to prove that the equipment operated under abnormal grid conditions.

[0124] As can be seen, based on the above process, the embodiment of the present invention implements a complete intelligent start-up control logic. The entire process begins with priority fan start-up, utilizing low-power loads to gain voltage observation time; subsequently, based on the comparison between real-time voltage and preset thresholds, it automatically switches to protective start-up mode when the power grid is unstable, starting the compressor with limited power to avoid damage caused by forced full-power start-up; after the power grid stabilizes, the system gradually increases from limited power to the user-set power, achieving a smooth transition; if the voltage fluctuates again during the recovery process, the system immediately pauses the increase or appropriately reduces the power, forming a dynamic closed-loop protection; simultaneously, the storage module records key events throughout the process, providing data support for subsequent diagnosis and maintenance. This complete process ensures that the compressor always operates within a safe power range adapted to the power grid conditions, avoiding the risk of damage caused by forced full-power start-up when the voltage is unstable, and automatically returning to the user setting after the power grid recovers, ensuring equipment safety while also considering the user experience.

[0125] The present invention also proposes an electronic device with a processor-memory architecture. Figure 5 This is a structural diagram of an electronic device according to an embodiment of the present invention. Figure 5 As shown, the electronic device 500 includes a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the computer program is executed by the processor 501, it implements any of the above-described variable frequency air conditioner start-up control methods. Specifically, the memory 502 can be implemented as various storage media such as electrically erasable programmable read-only memory (EEPROM), flash memory, and programmable programmable read-only memory (PROM). The processor 501 can be implemented as including one or more central processing units (CPUs) or one or more field-programmable gate arrays (FPGAs), wherein the FPGA integrates one or more CPU cores. Specifically, the CPU or CPU core can be implemented as a CPU, MCU, or DSP, etc.

[0126] It should be noted that not all steps and modules in the above processes and structural diagrams are mandatory; some steps or modules can be omitted as needed. The execution order of the steps is not fixed and can be adjusted as required. The division of modules is merely for the convenience of description and functional division. In actual implementation, a module can be implemented by multiple modules, and the functions of multiple modules can also be implemented by the same module. These modules can be located in the same device or in different devices.

[0127] The hardware modules in each embodiment can be implemented mechanically or electronically. For example, a hardware module may include specially designed permanent circuitry or logic devices (such as dedicated processors, such as FPGAs or ASICs) to perform specific operations. A hardware module may also include programmable logic devices or circuitry (such as general-purpose processors or other programmable processors) temporarily configured by software to perform specific operations. The choice between mechanical implementation, dedicated permanent circuitry, or temporarily configured circuitry (such as software-configured circuitry) for the hardware module can be made based on cost and time considerations.

[0128] The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform the methods described in this application. Specifically, a system or apparatus equipped with a storage medium storing software program code that implements the functions of any of the embodiments described above, and causing a computer (e.g., CPU, MCU, or MPU) of the system or apparatus to read and execute the program code stored in the storage medium. Furthermore, an operating system or similar device operating on a computer can perform some or all of the actual operations through instructions based on the program code. The program code read from the storage medium can also be written to a memory located in an expansion board inserted into a computer or to a memory located in an expansion unit connected to the computer. Subsequently, a control unit or similar device installed on the expansion board or expansion unit can perform some or all of the actual operations based on the instructions of the program code, thereby implementing the functions of any of the embodiments described above. Storage medium embodiments for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer or the cloud via a communication network.

[0129] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A start-up control system (10) for a variable frequency air conditioner, characterized in that, include: The monitoring module (11) is used to monitor the input voltage of the variable frequency air conditioner in real time; The start-up module (12) is electrically connected to the monitoring module (11) and is used to start the ventilation fan of the variable frequency air conditioner in response to the monitoring module (11) detecting the input voltage for the first time; after the ventilation fan is started, the compressor of the variable frequency air conditioner is controlled to start based on the comparison result of the input voltage and a preset threshold range.

2. The system (10) according to claim 1, characterized in that, The startup module (12) is used to start the compressor based on the set power received via the user interface when the input voltage is within the preset threshold range; and to ignore the set power received via the user interface and start the compressor with a limited power when the input voltage is outside the preset threshold range, wherein the limited power is less than the set power.

3. The system (10) according to claim 2, characterized in that, The startup module (12) is further configured to: after the compressor is started with limited power, when the input voltage changes from outside the preset threshold range to within the preset threshold range, starting from the limited power, gradually increase the operating power of the compressor in predetermined steps until the set power is reached.

4. The system (10) according to claim 3, characterized in that, The startup module (12) is used to pause increasing the operating power or decrease the operating power when the monitoring module (11) detects that the input voltage is outside the preset threshold range again during the process of gradually increasing the operating power of the compressor in predetermined steps.

5. The system (10) according to any one of claims 1-4, characterized in that, Also includes: The storage module is electrically connected to the monitoring module (11) and the startup module (12) respectively, and is used to record events where the input voltage detected by the monitoring module (11) is outside the preset threshold range, and events where the startup module (12) starts the compressor with limited power.

6. The system (10) according to any one of claims 1-4, characterized in that, The monitoring module (11) and the power management chip of the variable frequency air conditioner are located on the same circuit board; or The monitoring module (11) is integrated into the power management chip.

7. The system (10) according to any one of claims 1-4, characterized in that, The start-up control system (10) is integrated inside the variable frequency air conditioner; or The start-up control system (10) is independently configured as an external controller connected to the variable frequency air conditioner.

8. A variable frequency air conditioner, characterized in that, Including the start-up control system (10) of the variable frequency air conditioner as described in any one of claims 1-7.

9. A start-up control method for a variable frequency air conditioner, characterized in that, include: Real-time monitoring of the input voltage of the (101) variable frequency air conditioner; In response to the first detection of the input voltage, the ventilation fan of the variable frequency air conditioner is started (102); After the ventilation fan is started, the compressor of the variable frequency air conditioner is controlled (103) to start based on the comparison result of the input voltage and the preset threshold range.

10. The method according to claim 9, characterized in that, The control (103) for starting the compressor of the variable frequency air conditioner includes: When the input voltage is within the preset threshold range, the compressor is started based on the set power received via the user interface; When the input voltage is outside the preset threshold range, the set power received via the user interface is ignored and the compressor is started with a limited power, wherein the limited power is less than the set power.

11. The method according to claim 10, characterized in that, Also includes: After the compressor is started with limited power, when the input voltage changes from outside the preset threshold range to within the preset threshold range, the operating power of the compressor is gradually increased in predetermined steps, starting from the limited power, until the set power is reached.

12. The method according to claim 11, characterized in that, Also includes: During the process of gradually increasing the operating power of the compressor in predetermined steps, if the input voltage is detected to be outside the preset threshold range again, the increase in operating power is paused or the operating power is reduced.

13. An electronic device, characterized in that, It includes a processor and a memory; the memory stores an application program that can be executed by the processor to cause the processor to perform the start-up control method for a variable frequency air conditioner as described in any one of claims 9-12.

14. A computer-readable storage medium storing computer instructions thereon, characterized in that, When the computer instructions are executed by the processor, the start-up control method for the variable frequency air conditioner as described in any one of claims 9-12 is implemented.

15. A computer program product, characterized in that, It includes a computer program, which, when executed by a processor, implements the start-up control method for a variable frequency air conditioner as described in any one of claims 9-12.

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