Three-phase electric safety power control method, device and air conditioner

Abstract

The application provides a three-phase electric safety power consumption control method, device and air conditioner, which is applied to the air conditioner control field, and the method comprises the following steps: acquiring a phase voltage threshold value set by the air conditioner and a current running power of the air conditioner; based on the phase voltage threshold value, the current running power and a target curve formula, a target voltage difference value between a no-load bus voltage and a maximum bus voltage is calculated, and the no-load bus voltage of the air conditioner is calculated based on the phase voltage threshold value; according to the target voltage difference value and the no-load bus voltage, the maximum bus voltage is calculated, and in the case that a rectification input voltage is greater than the maximum bus voltage, an overvoltage protection strategy is executed. The three-phase electric safety power consumption control method, device and air conditioner provided by the application are used for accurately calculating the voltage value actually input to the rectification side, so that the air conditioner can accurately judge whether the current input voltage exceeds the safe power consumption range, and corresponding overvoltage protection measures are taken in time.

Description

Technical Field

[0001] This application relates to the field of air conditioner control, and in particular to a three-phase safe power control method, device and air conditioner. Background Technology

[0002] As people's living standards continue to improve and the level of intelligence in home appliances continues to rise, smart home appliances are becoming increasingly popular. Users can use air conditioners to heat in winter to raise the indoor temperature, and they can also use air conditioners to cool in summer to lower the indoor temperature.

[0003] In related technologies, in order to suppress harmonic currents, the power supply of a three-phase air conditioner is input into a reactor for rectification. When current flows through the reactor, a magnetic field is generated inside the reactor. This magnetic field interacts with the current, causing inductance (i.e. impedance) to be generated inside the reactor. This results in the actual voltage input to the rectifier side being lower than the power supply input voltage, thus causing the actual rectified voltage to be less than the rectified voltage value under the rated voltage.

[0004] Therefore, there is an urgent need for a method that can accurately calculate the actual voltage value input to the rectifier side, so that the air conditioner can accurately determine whether the current input voltage exceeds the safe power range and take appropriate overvoltage protection measures in a timely manner. Summary of the Invention

[0005] The purpose of this application is to provide a three-phase power safety control method, device, and air conditioner, which is used to accurately calculate the actual voltage value input to the rectifier side, so that the air conditioner can accurately determine whether the current input voltage exceeds the safe power use range and take corresponding overvoltage protection measures in a timely manner.

[0006] This application provides a three-phase power safety control method, including:

[0007] The system obtains the set phase voltage threshold and the current operating power of the air conditioner; based on the phase voltage threshold, the current operating power, and the target curve formula, it calculates the target voltage difference between the no-load bus voltage and the maximum bus voltage, and calculates the no-load bus voltage of the air conditioner based on the phase voltage threshold; based on the target voltage difference and the no-load bus voltage, it calculates the maximum bus voltage and determines the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; if the rectified input voltage is greater than the maximum bus voltage, it executes an overvoltage protection strategy; wherein, the target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0008] Optionally, before calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and the target curve formula, the method further includes: obtaining the actual bus voltage measurement values ​​of the air conditioner at different operating powers based on the phase voltage threshold, and calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold; calculating the bus voltage difference of the air conditioner at different operating powers based on the actual bus voltage measurement values ​​of the air conditioner at different operating powers and the no-load bus voltage of the air conditioner; fitting the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner based on the bus voltage difference of the air conditioner at different operating powers, and obtaining the target curve formula based on the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner.

[0009] Optionally, calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and the target curve formula includes: determining the target voltage difference corresponding to the current operating power based on the target curve formula.

[0010] Optionally, calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold includes: calculating the peak value of the no-load phase voltage of the air conditioner based on the phase voltage threshold, and calculating the no-load bus voltage based on the peak value of the no-load phase voltage.

[0011] Optionally, the step of calculating the maximum bus voltage based on the target voltage difference and the no-load bus voltage includes: calculating a target difference between the no-load bus voltage and the target voltage difference, and determining the target difference as the maximum bus voltage.

[0012] Optionally, the overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage includes: when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than a first voltage difference, controlling the voltage divider circuit of the air conditioner to adjust the voltage division ratio and reduce the input voltage of the air conditioner's operating circuit.

[0013] Optionally, the overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage includes: controlling the compressor, and / or the indoor unit, and / or the outdoor unit of the air conditioner to shut down when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is greater than or equal to a first voltage difference.

[0014] This application also provides a three-phase electrical safety control device, including:

[0015] The system includes: an acquisition module for acquiring the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner; a calculation module for calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and the target curve formula, and for calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold; the calculation module is also used to calculate the maximum bus voltage based on the target voltage difference and the no-load bus voltage; a judgment module for judging the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; and a control module for executing an overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage; wherein, the target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; and the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0016] Optionally, the device further includes: a data fitting module; the acquisition module is further configured to acquire the actual bus voltage measurement value of the air conditioner under different operating power based on the phase voltage threshold; the calculation module is further configured to calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; the calculation module is further configured to calculate the bus voltage difference of the air conditioner under different operating power based on the actual bus voltage measurement value of the air conditioner under different operating power and the no-load bus voltage of the air conditioner; the data fitting module is configured to fit the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner based on the bus voltage difference of the air conditioner under different operating power, and obtain the target curve formula based on the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner.

[0017] Optionally, the calculation module is specifically used to determine the target voltage difference corresponding to the current operating power based on the target curve formula.

[0018] Optionally, the calculation module is specifically used to calculate the peak value of the no-load phase voltage of the air conditioner based on the phase voltage threshold, and to calculate the no-load bus voltage based on the peak value of the no-load phase voltage.

[0019] Optionally, the calculation module is specifically used to calculate the target difference between the unloaded bus voltage and the target voltage, and to determine the target difference as the maximum bus voltage.

[0020] Optionally, the control module is specifically used to control the voltage divider circuit of the air conditioner to adjust the voltage division ratio and reduce the input voltage of the air conditioner's operating circuit when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than a first voltage difference.

[0021] Optionally, the control module is specifically used to control the voltage divider circuit of the air conditioner to adjust the voltage division ratio and reduce the input voltage of the air conditioner's operating circuit when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than a first voltage difference.

[0022] This application also provides an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the three-phase power safety control methods described above.

[0023] This application also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of any of the three-phase power safety control methods described above.

[0024] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the three-phase power safety control methods described above.

[0025] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the three-phase power safety control methods described above.

[0026] The three-phase power safety control method, device, and air conditioner provided in this application first obtain the set phase voltage threshold and the current operating power of the air conditioner; then, based on the phase voltage threshold, the current operating power, and a target curve formula, calculate the target voltage difference between the no-load bus voltage and the maximum bus voltage, and calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; simultaneously, calculate the maximum bus voltage according to the target voltage difference and the no-load bus voltage, and determine the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; finally, if the rectified input voltage is greater than the maximum bus voltage, execute an overvoltage protection strategy. The target curve formula indicates the correspondence between the output power of the air conditioner and the bus voltage difference; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner. In this way, the actual voltage value input to the rectifier side can be accurately calculated, so that the air conditioner can accurately determine whether the current input voltage exceeds the safe power range and take appropriate overvoltage protection measures in time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the air conditioner's operating principle provided in this application;

[0029] Figure 2 This is a flowchart illustrating the three-phase safe electricity use control method provided in this application;

[0030] Figure 3 This is a schematic diagram of the fitting curve obtained based on actual measurement data provided in this application;

[0031] Figure 4 This is a schematic diagram of the structure of the three-phase power safety control device provided in this application;

[0032] Figure 5 This is a schematic diagram of the structure of the electronic device provided in this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0035] The operating principle of the air conditioner involved in the embodiments of this application is described in detail below:

[0036] like Figure 1 As shown, the compressor compresses the refrigerant and delivers it through pipes to the condenser. The high-temperature, high-pressure gaseous refrigerant releases heat in the condenser, transforming into a medium-temperature, high-pressure liquid refrigerant. Then, the medium-temperature, high-pressure liquid refrigerant is depressurized through a capillary tube (throttling unit) to become a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant is then delivered to the evaporator, where it evaporates into a gas, absorbing a large amount of heat during the evaporation process. Finally, the low-temperature, low-pressure gaseous refrigerant in the evaporator is delivered to the compressor to participate in the next cycle. When the air conditioner is cooling, the outdoor unit's heat exchanger acts as the condenser, and the indoor unit's heat exchanger acts as the evaporator; conversely, when the air conditioner is heating, the outdoor unit's heat exchanger acts as the evaporator, and the indoor unit's heat exchanger acts as the condenser.

[0037] The following describes the relevant technical terms used in the embodiments of this application:

[0038] Impedance: The impedance of a coil (reactor) is due to the magnetic field generated inside the coil when current flows through it. This magnetic field interacts with the current, causing inductance to form within the coil. Inductance is the ratio between the voltage generated when the current changes and the current itself; that is, impedance. Therefore, the principle behind the impedance of a coil is the inductance within the coil when current flows through it.

[0039] Phase voltage refers to the voltage of each phase in a three-phase power system. In a three-phase system, three AC voltage waveforms are delayed by 120 degrees to form a three-phase power grid. Each phase voltage reaches its maximum value in turn, called the phase voltage peak value. Phase voltage is usually expressed in terms of its effective value, that is, the effective voltage of each phase in the three-phase system. The frequency of phase voltage is constant, usually 50Hz or 60Hz, and their phase difference and amplitude are fixed. In a three-phase system, phase voltage is the fundamental voltage supplying various electrical equipment and facilities.

[0040] Three-phase power input voltage: Vac = 380V; Rectified voltage without reactor: Vm = 380V * 1.732 = 658V; Rectified voltage with reactor: Vlm = (380V - Vl) * 1.732, where Vl = L * I * 2πF, L: inductance, I: current flowing through, F: power supply frequency. From the above formulas, it can be seen that the reactor-induced voltage is different when the overall input power is different, that is, when the input current is different, the rectified voltage after rectification is also a dynamically changing value.

[0041] The three-phase safe power control method provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0042] like Figure 2 As shown in the embodiment of this application, a three-phase power safety control method is provided, which may include the following steps 201 to 204:

[0043] Step 201: Obtain the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner.

[0044] For example, the aforementioned phase voltage threshold is a set value for the air conditioner. The phase voltage threshold for different air conditioners will vary depending on the air conditioner's maximum operating power, actual hardware conditions, etc. That is, the aforementioned phase voltage threshold is the maximum phase voltage that the air conditioner can allow. When the phase voltage of the air conditioner exceeds this phase voltage threshold, it may cause the electronic components of the air conditioner to burn out, thereby causing the air conditioner to malfunction.

[0045] For example, in this embodiment of the application, the maximum bus voltage that the air conditioner can safely operate can be calculated by the following steps, and the safety of electricity use can be determined by comparing the rectified input voltage after rectification with the maximum bus voltage.

[0046] Step 202: Based on the phase voltage threshold, the current operating power, and the target curve formula, calculate the target voltage difference between the no-load bus voltage and the maximum bus voltage, and calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold.

[0047] The target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0048] For example, the aforementioned no-load bus voltage is the no-load bus voltage of the air conditioner calculated based on the aforementioned phase voltage threshold. In this embodiment of the application, when the current operating power is known, the voltage difference between the no-load bus voltage and the maximum bus voltage can be calculated using the aforementioned target curve formula.

[0049] Specifically, the step of calculating the target voltage value in step 202 above may include the following step 202a:

[0050] Step 202a: Determine the target voltage difference corresponding to the current operating power based on the target curve formula.

[0051] For example, such as Figure 3 As shown, taking the target curve ΔV = a*Pm + b, where a = 0.0171 and b = 19 as an example, ΔV is the voltage difference between the no-load bus voltage and the maximum bus voltage, and Pm is the output power. When the output power Pm = 3000, the voltage difference between the no-load bus voltage and the maximum bus voltage ΔV = 0.0171*3000 + 19 = 70.3V (volts).

[0052] Specifically, step 202 above, the step of calculating the no-load bus voltage, may include the following step 202b:

[0053] Step 202b: Calculate the peak value of the no-load phase voltage of the air conditioner based on the phase voltage threshold, and calculate the no-load bus voltage based on the peak value of the no-load phase voltage.

[0054] For example, the above-mentioned no-load bus voltage Vm can be calculated using the following formula:

[0055]

[0056] Where Va is the phase voltage threshold.

[0057] Step 203: Calculate the maximum bus voltage based on the target voltage difference and the no-load bus voltage, and determine the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification.

[0058] For example, after obtaining the target voltage difference and the no-load bus voltage, the maximum bus voltage can be calculated. This maximum bus voltage is the maximum bus voltage that the air conditioner can safely operate at.

[0059] Specifically, step 203 above may include the following step 203a:

[0060] Step 203a: Calculate the target difference between the unloaded bus voltage and the target voltage, and determine the target difference as the maximum bus voltage.

[0061] For example, the aforementioned maximum bus voltage can be calculated according to the following formula:

[0062] ΔV=Vm-Vdc (Formula 2)

[0063] Where Vm is the no-load bus voltage and Vdc is the maximum bus voltage. Based on the above formula 2, the maximum bus voltage Vdc = Vm - ΔV.

[0064] For example, based on Figure 3 As shown in the fitted curve (i.e. the target curve formula above), since ΔV = Vm - Vdc, the maximum bus voltage Vdc can be calculated when the no-load bus voltage Vm and the voltage difference ΔV between the no-load bus voltage and the maximum bus voltage are known.

[0065] For example, after calculating the maximum bus voltage, it can be compared with the rectified input voltage to determine whether the input voltage of the air conditioner exceeds the limit for safe electricity use.

[0066] Step 204: If the rectified input voltage is greater than the maximum bus voltage, execute the overvoltage protection strategy.

[0067] For example, if the rectified input voltage is greater than the maximum bus voltage, it can be determined whether the input voltage of the air conditioner exceeds the limit for safe power use. In this case, an overvoltage protection strategy needs to be implemented to prevent the electrical equipment from being burned out due to excessive voltage.

[0068] Specifically, the overvoltage protection step in step 203 above may include either step 203a or step 203b:

[0069] Step 203a: When the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than the first voltage difference, control the voltage divider circuit of the air conditioner to adjust the voltage division ratio and reduce the input voltage of the air conditioner's operating circuit.

[0070] Step 203b: When the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is greater than or equal to the first voltage difference, control the compressor of the air conditioner, and / or the indoor unit, and / or the outdoor unit to stop.

[0071] For example, when the rectified input voltage is greater than the maximum bus voltage, but the difference between the rectified input voltage and the maximum bus voltage is small, the voltage input to the working circuit of the air conditioner can be reduced by adjusting the voltage division ratio of the voltage divider circuit, so as to avoid damage to the appliance due to excessive voltage.

[0072] For example, when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is large, the voltage divider circuit is no longer effective. In this case, it is necessary to directly control the power equipment to stop to avoid damage to the power equipment.

[0073] Optionally, in the embodiments of this application, the above-mentioned target curve formula can be obtained by the following method.

[0074] For example, prior to step 202 above, the three-phase power safety control method provided in this application embodiment may further include the following steps 205 to 207:

[0075] Step 205: Obtain the actual bus voltage measurement value of the air conditioner under different operating power based on the phase voltage threshold, and calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold.

[0076] Step 206: Calculate the bus voltage difference of the air conditioner under different operating power based on the actual bus voltage measurement value of the air conditioner under different operating power and the no-load bus voltage of the air conditioner.

[0077] Step 207: Based on the bus voltage difference of the air conditioner under different operating power, fit the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner, and based on the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner, obtain the target curve formula.

[0078] For example, before obtaining the target curve formula, it is first necessary to determine the phase voltage threshold of the air conditioner, calculate the no-load bus voltage based on this phase voltage threshold, and measure the actual bus voltage of the air conditioner at different power levels when the phase voltage is at the phase voltage threshold. See Table 1 below for details:

[0079] Pm Bus voltage difference ΔV Actual bus voltage V1 No-load bus voltage V2 Phase voltage V3 500w ΔV=V2-V1 Measured values V2=V3*√2*√3 280V 1000w ΔV=V2-V1 Measured values V2=V3*√2*√3 280V 1500w ΔV=V2-V1 Measured values V2=V3*√2*√3 280V …

[0080] Table 1

[0081] For example, based on the data in Table 1 above, we can obtain the following: Figure 3 The actual data curve formed by the measured values ​​shown can be obtained by fitting the curve as shown. Figure 3 The fitted curve shown is accompanied by the corresponding formula for the target curve.

[0082] It should be noted that the three-phase power safety control method provided in this application embodiment can accurately estimate the actual bus voltage of the air conditioner during operation without relying on additional sensors.

[0083] The three-phase power safety control method provided in this application first obtains the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner. Then, based on the phase voltage threshold, the current operating power, and a target curve formula, it calculates the target voltage difference between the no-load bus voltage and the maximum bus voltage, and calculates the no-load bus voltage of the air conditioner based on the phase voltage threshold. Simultaneously, based on the target voltage difference and the no-load bus voltage, it calculates the maximum bus voltage and determines the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification. Finally, if the rectified input voltage is greater than the maximum bus voltage, an overvoltage protection strategy is executed. The target curve formula indicates the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner. In this way, the actual voltage value input to the rectifier side can be accurately calculated, enabling the air conditioner to accurately determine whether the current input voltage exceeds the safe power usage range and take appropriate overvoltage protection measures in a timely manner.

[0084] It should be noted that the three-phase power safety control method provided in this application embodiment can be executed by a three-phase power safety control device, or a control module in the three-phase power safety control device for executing the three-phase power safety control method. This application embodiment uses the execution of the three-phase power safety control method by a three-phase power safety control device as an example to illustrate the three-phase power safety control device provided in this application embodiment.

[0085] It should be noted that, in the embodiments of this application, the three-phase power safety control methods shown in the accompanying drawings are all illustrated by way of example with reference to one of the accompanying drawings in the embodiments of this application. In specific implementation, the three-phase power safety control methods shown in the accompanying drawings of the above methods can also be implemented in conjunction with any other accompanying drawings shown in the above embodiments, which will not be elaborated here.

[0086] The three-phase power safety control device provided in this application is described below. The three-phase power safety control method described below can be referred to in correspondence with the three-phase power safety control method described above.

[0087] Figure 4 This is a schematic diagram of the structure of a three-phase power safety control device provided in an embodiment of this application, as shown below. Figure 4 As shown, it specifically includes:

[0088] The acquisition module 401 is used to acquire the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner; the calculation module 402 is used to calculate the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power and the target curve formula, and to calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; the calculation module 402 is also used to calculate the maximum bus voltage according to the target voltage difference and the no-load bus voltage; the judgment module 403 is used to judge the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; the control module 404 is used to execute an overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage; wherein, the target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0089] Optionally, the device further includes: a data fitting module; the acquisition module 401 is further configured to acquire the actual bus voltage measurement value of the air conditioner under different operating power based on the phase voltage threshold; the calculation module 402 is further configured to calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; the calculation module 402 is further configured to calculate the bus voltage difference of the air conditioner under different operating power based on the actual bus voltage measurement value of the air conditioner under different operating power and the no-load bus voltage of the air conditioner; the data fitting module is configured to fit the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner based on the bus voltage difference of the air conditioner under different operating power, and obtain the target curve formula based on the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner.

[0090] Optionally, the calculation module 402 is specifically used to determine the target voltage difference corresponding to the current operating power based on the target curve formula.

[0091] Optionally, the calculation module 402 is specifically used to calculate the peak value of the no-load phase voltage of the air conditioner based on the phase voltage threshold, and to calculate the no-load bus voltage based on the peak value of the no-load phase voltage.

[0092] Optionally, the calculation module 402 is specifically used to calculate the target difference between the unloaded bus voltage and the target voltage, and to determine the target difference as the maximum bus voltage.

[0093] Optionally, the control module 404 is specifically used to control the voltage divider circuit of the air conditioner to adjust the voltage division ratio and reduce the input voltage of the air conditioner's operating circuit when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than a first voltage difference.

[0094] Optionally, the control module 404 is specifically used to control the voltage divider circuit of the air conditioner to adjust the voltage division ratio and reduce the input voltage of the air conditioner's operating circuit when the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than a first voltage difference.

[0095] The three-phase power safety control device provided in this application first obtains the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner; then, based on the phase voltage threshold, the current operating power, and a target curve formula, it calculates the target voltage difference between the no-load bus voltage and the maximum bus voltage, and calculates the no-load bus voltage of the air conditioner based on the phase voltage threshold; simultaneously, based on the target voltage difference and the no-load bus voltage, it calculates the maximum bus voltage and determines the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; finally, if the rectified input voltage is greater than the maximum bus voltage, it executes an overvoltage protection strategy. The target curve formula indicates the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner. In this way, the actual voltage value input to the rectifier side can be accurately calculated, enabling the air conditioner to accurately determine whether the current input voltage exceeds the safe power usage range and take appropriate overvoltage protection measures in a timely manner.

[0096] Figure 5 This example illustrates a schematic diagram of the physical structure of an electronic device, which can be the aforementioned air conditioner, such as... Figure 5As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 can call logic instructions in the memory 530 to execute a three-phase power safety control method. This method includes: acquiring the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner; calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and a target curve formula, and calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold; calculating the maximum bus voltage according to the target voltage difference and the no-load bus voltage, and determining the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; and executing an overvoltage protection strategy if the rectified input voltage is greater than the maximum bus voltage. The target curve formula indicates the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0097] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] On the other hand, this application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer can execute the three-phase power safety control method provided by the above methods. The method includes: obtaining the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner; calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and a target curve formula, and calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold; calculating the maximum bus voltage according to the target voltage difference and the no-load bus voltage, and determining the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; and executing an overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage. The target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0099] In another aspect, this application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the three-phase power safety control methods provided above. The method includes: acquiring a set phase voltage threshold and the current operating power of the air conditioner; calculating a target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and a target curve formula, and calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold; calculating the maximum bus voltage according to the target voltage difference and the no-load bus voltage, and determining the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; and executing an overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage; wherein the target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; and the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner.

[0100] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0101] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A three-phase power safety control method, characterized in that, Applied to air conditioners, including: Obtain the set phase voltage threshold of the air conditioner and the current operating power of the air conditioner; Based on the phase voltage threshold, the current operating power, and the target curve formula, calculate the target voltage difference between the no-load bus voltage and the maximum bus voltage, and calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; Based on the target voltage difference and the no-load bus voltage, calculate the maximum bus voltage and determine the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification. If the rectified input voltage is greater than the maximum bus voltage, an overvoltage protection strategy is executed. The target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner. Before calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and the target curve formula, the method further includes: Based on the phase voltage threshold, the actual bus voltage measurement value of the air conditioner under different operating power is obtained, and the no-load bus voltage of the air conditioner is calculated based on the phase voltage threshold. The bus voltage difference of the air conditioner under different operating power is calculated based on the actual bus voltage measurement value of the air conditioner under different operating power and the no-load bus voltage of the air conditioner. Based on the bus voltage difference of the air conditioner at different operating power, the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner is fitted, and based on the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner, the target curve formula is obtained.

2. The method according to claim 1, characterized in that, The calculation of the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and the target curve formula includes: The target voltage difference corresponding to the current operating power is determined based on the target curve formula.

3. The method according to claim 1, characterized in that, The calculation of the no-load bus voltage of the air conditioner based on the phase voltage threshold includes: The unloaded phase voltage peak of the air conditioner is calculated based on the phase voltage threshold, and the unloaded bus voltage is calculated based on the unloaded phase voltage peak.

4. The method according to claim 1, characterized in that, The step of calculating the maximum bus voltage based on the target voltage difference and the no-load bus voltage includes: Calculate the target difference between the unloaded bus voltage and the target voltage, and determine the target difference as the maximum bus voltage.

5. The method according to claim 1, characterized in that, The overvoltage protection strategy implemented when the rectified input voltage is greater than the maximum bus voltage includes: When the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is less than a first voltage difference, the voltage divider circuit of the air conditioner is controlled to adjust the voltage division ratio to reduce the input voltage of the air conditioner's operating circuit.

6. The method according to claim 1 or 5, characterized in that, The overvoltage protection strategy implemented when the rectified input voltage is greater than the maximum bus voltage includes: When the rectified input voltage is greater than the maximum bus voltage and the difference between the rectified input voltage and the maximum bus voltage is greater than or equal to a first voltage difference, the compressor of the air conditioner, and / or the indoor unit, and / or the outdoor unit are controlled to stop.

7. A three-phase electrical safety control device, characterized in that, The device, used in air conditioners, includes: The acquisition module is used to acquire the phase voltage threshold set by the air conditioner and the current operating power of the air conditioner; The calculation module is used to calculate the target voltage difference between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold, the current operating power, and the target curve formula, and to calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold. The calculation module is also used to calculate the maximum bus voltage based on the target voltage difference and the no-load bus voltage; The judgment module is used to determine the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; The control module is used to execute an overvoltage protection strategy when the rectified input voltage is greater than the maximum bus voltage; The target curve formula is used to indicate the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner; the bus voltage difference is the difference between the no-load bus voltage and the maximum bus voltage of the air conditioner. The device further includes: a data fitting module; The acquisition module is also used to acquire the actual bus voltage measurement value of the air conditioner under different operating power based on the phase voltage threshold; The calculation module is also used to calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold. The calculation module is also used to calculate the bus voltage difference of the air conditioner under different operating power based on the actual bus voltage measurement value of the air conditioner under different operating power and the no-load bus voltage of the air conditioner. The data fitting module is used to fit the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner based on the bus voltage difference of the air conditioner under different operating power, and to obtain the target curve formula based on the correspondence between the output power of the air conditioner and the bus voltage difference of the air conditioner.

8. An air conditioner, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the three-phase power safety control method as described in any one of claims 1 to 6.

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