Three-phase electricity safety electricity utilization control method and device and air conditioner

Abstract

The invention provides a three-phase electricity safety electricity utilization control method and device and an air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that a set phase voltage threshold value of the air conditioner and the current operation power of the air conditioner are obtained; calculating a target voltage difference value between the no-load bus voltage and the maximum bus voltage based on the phase voltage threshold value, the current operation power and a target curve formula, and calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold value; and calculating the maximum bus voltage according to the target voltage difference value and the no-load bus voltage, and executing an overvoltage protection strategy under the condition that the rectification input voltage is greater than the maximum bus voltage. According to the three-phase electricity safety electricity utilization control method and device and the air conditioner, the value of the voltage actually input to the rectification side is accurately calculated, so that the air conditioner can accurately judge whether the current input voltage exceeds the safety electricity utilization range or not, and corresponding overvoltage protection measures are taken in time.

Description

Technical Field

[0001] The present application relates to the field of air conditioner control, and in particular to a three-phase electricity safety control method, device and air conditioner. Background Art

[0002] As people's living standards continue to improve and the level of intelligence of home appliances continues to increase, smart home appliances are becoming more and more popular. Users can use air conditioners for heating in winter to increase the indoor temperature, and can also use air conditioners for cooling in summer to reduce the indoor temperature.

[0003] In the related art, in order to suppress harmonic currents, the power supply of an air conditioner using three-phase electricity will be input into a reactor for rectification. When current passes through the reactor, a magnetic field will be generated inside the reactor. This magnetic field will interact with the current, causing inductance (i.e. impedance) to be generated inside the reactor, causing the actual voltage input to the rectifier side to be lower than the power supply input voltage, thereby causing the actual rectified voltage to be lower than the rectified voltage value at the rated voltage.

[0004] Based on this, 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 range of safe power use and take corresponding overvoltage protection measures in time. Summary of the invention

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

[0006] The present application provides a three-phase power safety control method, comprising:

[0007] Obtain the phase voltage threshold set for the air conditioner and the current operating power of the air conditioner; 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 calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; 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; 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 corresponding relationship 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 also includes: obtaining the actual bus voltage measurement value 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 value 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 a no-load phase voltage peak value of the air conditioner based on the phase voltage threshold value, and calculating the no-load bus voltage based on the no-load phase voltage peak value.

[0011] Optionally, 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, when the rectifier input voltage is greater than the maximum bus voltage, an overvoltage protection strategy is executed, including: when the rectifier input voltage is greater than the maximum bus voltage and the difference between the rectifier 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 divider ratio to reduce the input voltage of the air conditioner working circuit.

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

[0014] The present application also provides a three-phase power safety control device, comprising:

[0015] An acquisition module is used to acquire the phase voltage threshold set for the air conditioner and the current operating power of the air conditioner; a 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 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; a judgment module is used to judge the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; a control module 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 corresponding relationship 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.

[0016] Optionally, the device also includes: a data fitting module; the acquisition module is also used to acquire the actual bus voltage measurement value of the air conditioner at different operating powers 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 at different operating powers based on the actual bus voltage measurement value of the air conditioner at different operating powers and the no-load bus voltage of the air conditioner; the data fitting module is used to fit the corresponding relationship 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 obtain the target curve formula based on the corresponding relationship 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 no-load phase voltage peak value of the air conditioner based on the phase voltage threshold, and calculate the no-load bus voltage based on the no-load phase voltage peak value.

[0019] Optionally, the calculation module is specifically used to calculate a target difference between the no-load bus voltage and the target voltage difference, and 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 divider ratio and reduce the input voltage of the air conditioner working 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 divider ratio and reduce the input voltage of the air conditioner working 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] The present application also provides an air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-mentioned three-phase electricity safety control methods are implemented.

[0023] The present application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of any of the above-mentioned three-phase power safety control methods.

[0024] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-mentioned three-phase electricity safety control methods are implemented.

[0025] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any of the above-mentioned three-phase power safety control methods are implemented.

[0026] The three-phase electricity safety control method, device and air conditioner provided in the present application first obtain 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 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; at the same time, according to the target voltage difference and the no-load bus voltage, calculate the maximum bus voltage, and judge the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; finally, when the rectified input voltage is greater than the maximum bus voltage, execute the overvoltage protection strategy. Among them, the target curve formula is used to indicate the corresponding relationship 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, so that the air conditioner can accurately determine whether the current input voltage exceeds the range of safe power use and take corresponding overvoltage protection measures in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the operating principle of the air conditioner provided by this application;

[0029] Figure 2 It is a flow chart of the three-phase power safety control method provided by the present application;

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

[0031] Figure 4 It is a structural schematic diagram of the three-phase power safety control device provided by the present application;

[0032] Figure 5 It is a schematic diagram of the structure of the electronic device provided by this application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

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

[0036] like Figure 1 As shown in the figure, the compressor compresses the refrigerant (coolant) and transports it to the condenser through a pipeline. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser and becomes a medium-temperature and high-pressure liquid refrigerant. After that, the medium-temperature and high-pressure liquid refrigerant is depressurized by a capillary tube (throttling unit) and becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant is transported to the evaporator to evaporate from liquid to gas, and absorbs a large amount of heat during the evaporation process. Finally, the low-temperature and low-pressure gaseous refrigerant in the evaporator is transported to the compressor to participate in the next cycle. When the air conditioner is cooling, the heat exchanger of the outdoor unit is the condenser, and the heat exchanger of the indoor unit is the evaporator; conversely, when the air conditioner is heating, the heat exchanger of the outdoor unit is the evaporator, and the heat exchanger of the indoor unit is the condenser.

[0037] The following is a description of the relevant professional terms involved in the embodiments of the present application:

[0038] Impedance: The impedance of a coil (reactor) is generated because when current passes through the coil, a magnetic field is generated inside the coil. This magnetic field interacts with the current, causing inductance inside the coil. Inductance is the proportional relationship between the voltage and current generated when the current changes, that is, impedance. Therefore, the principle of impedance generated by the coil is caused by the inductance inside the coil when current passes through the coil.

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

[0040] Three-phase power input voltage: Vac = 380V; voltage after rectification without reactor: Vm = 380V*1.732 = 658V; voltage after rectification with reactor: Vlm = (380V-Vl)*1.732, where Vl = L*I*2πF, L: inductance, I: current, F: power frequency. It can be seen from the above formula that when the input power of the whole machine is different, that is, when the input current is different, the induction voltage of the reactor is different, and the corresponding rectified voltage after rectification is also a dynamic change value.

[0041] The following is a detailed description of the three-phase electricity safety control method provided in the embodiment of the present application through specific embodiments and application scenarios in conjunction with the accompanying drawings.

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

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

[0044] Exemplarily, the above phase voltage threshold is a set value of the air conditioner, and the phase voltage threshold of different air conditioners may vary according to the maximum operating power of the air conditioner, actual hardware conditions, etc. That is, the above phase voltage threshold is the maximum phase voltage allowed by the air conditioner. When the phase voltage of the air conditioner exceeds the phase voltage threshold, it may cause the electronic components of the air conditioner to burn out, thereby causing the air conditioner to malfunction.

[0045] Exemplarily, in an embodiment of the present application, the maximum bus voltage allowed for safe operation of the air conditioner can be calculated through the following steps, and whether electricity use is safe can be determined based on the comparison result between the rectified input voltage and the maximum bus voltage.

[0046] Step 202: 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 calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold.

[0047] Among them, the target curve formula is used to indicate the corresponding relationship 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] Exemplarily, the no-load bus voltage is the no-load bus voltage of the air conditioner calculated based on the phase voltage threshold. In the embodiment of the present 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 by the target curve formula.

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

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

[0051] For example, Figure 3 As shown, taking the above target curve as ΔV=a*Pm+b, a=0.0171, b=19 as an example, where 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 is ΔV=0.0171*3000+19=70.3V (volts).

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

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

[0054] Exemplarily, the no-load bus voltage Vm can be calculated by the following formula 1:

[0055]

[0056] Wherein, the above Va is the phase voltage threshold.

[0057] Step 203: Calculate the maximum bus voltage according to the target voltage difference and the no-load bus voltage, and determine the magnitude 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, which is the maximum bus voltage that can be allowed for safe operation of the air conditioner.

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

[0060] Step 203a, 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.

[0061] Exemplarily, the maximum bus voltage can be calculated according to the following formula 2:

[0062] ΔV=Vm-Vdc (Formula 2)

[0063] Wherein, Vm is the no-load bus voltage, Vdc is the maximum bus voltage, and based on the above formula 2, it can be known that the maximum bus voltage Vdc=Vm-ΔV.

[0064] For example, based on Figure 3 From the fitting curve shown (i.e., the above target curve formula), it can be seen that since ΔV=Vm-Vdc, 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, the maximum bus voltage Vdc can be calculated.

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

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

[0067] For example, when the rectifier input voltage is greater than the maximum bus voltage, it can be determined whether the input voltage of the air conditioner exceeds the limit of safe power consumption. At this time, an overvoltage protection strategy needs to be implemented to prevent excessive voltage from burning out electrical equipment.

[0068] Specifically, the step of performing the overvoltage protection step in the above step 203 may include the following 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 divider ratio to reduce the input voltage of the working circuit of the air conditioner.

[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 a first voltage difference, the compressor, and / or the indoor unit, and / or the outdoor unit of the air conditioner are controlled to shut down.

[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 dividing ratio of the voltage divider circuit to avoid damage to electrical appliances 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 has little effect. At this time, it is necessary to directly control the shutdown of the electrical equipment to avoid damage to the electrical equipment.

[0073] Optionally, in an embodiment of the present application, the target curve formula may be obtained by the following method.

[0074] Exemplarily, before the above step 202, the three-phase power safety control method provided in the embodiment of the present application may further include the following steps 205 to 207:

[0075] Step 205: Acquire actual bus voltage measurement values ​​of the air conditioner at different operating powers 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 at different operating powers based on the actual bus voltage measurement value of the air conditioner at different operating powers and the no-load bus voltage of the air conditioner.

[0077] Step 207: Based on the bus voltage difference of the air conditioner at different operating powers, the corresponding relationship between the output power of the air conditioner and the bus voltage difference of the air conditioner is fitted, and based on the corresponding relationship between the output power of the air conditioner and the bus voltage difference of the air conditioner, the target curve formula is obtained.

[0078] For example, before obtaining the target curve formula, it is necessary to first determine the phase voltage threshold of the air conditioner, and calculate the no-load bus voltage based on the phase voltage threshold, and measure the actual bus voltage of the air conditioner at different powers when the phase voltage is the phase voltage threshold by actual measurement. For details, refer to the following Table 1:

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

[0080] Table 1

[0081] For example, based on the data in Table 1 above, we can get Figure 3 The actual data curve composed of the measured values ​​shown in , after fitting, can be obtained as follows Figure 3 The fitting curve shown in , and the corresponding target curve formula.

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

[0083] The three-phase electricity safety control method provided in the embodiment of the present 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 the target curve formula, the target voltage difference between the no-load bus voltage and the maximum bus voltage is calculated, and the no-load bus voltage of the air conditioner is calculated based on the phase voltage threshold; at the same time, according to the target voltage difference and the no-load bus voltage, the maximum bus voltage is calculated, and the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification is judged; finally, when the rectified input voltage is greater than the maximum bus voltage, the overvoltage protection strategy is executed. Among them, the target curve formula is used to indicate the corresponding relationship 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 voltage value actually input to the rectifier side can be accurately calculated, so that the air conditioner can accurately judge whether the current input voltage exceeds the range of safe electricity use, and take corresponding overvoltage protection measures in time.

[0084] It should be noted that the execution subject of the three-phase power safety control method provided in the embodiment of the present application can be 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. In the embodiment of the present application, the execution of the three-phase power safety control method by the three-phase power safety control device is taken as an example to illustrate the three-phase power safety control device provided in the embodiment of the present application.

[0085] It should be noted that in the embodiments of the present application, the three-phase power safety control method shown in the above-mentioned method drawings is illustrated by taking one of the drawings in the embodiments of the present application as an example. In specific implementation, the three-phase power safety control method shown in the above-mentioned method drawings can also be implemented in combination with any other drawings that can be combined as shown in the above-mentioned embodiments, which will not be repeated here.

[0086] The three-phase electricity safety control device provided in the present application is described below, and the three-phase electricity safety control method described below and described above can be referenced to each other.

[0087] Figure 4 A schematic diagram of the structure of a three-phase power safety control device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, specifically including:

[0088] An acquisition module 401 is used to acquire the phase voltage threshold set for the air conditioner and the current operating power of the air conditioner; a 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 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 based on the target voltage difference and the no-load bus voltage; a judgment module 403 is used to judge the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; a 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 corresponding relationship 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 also includes: a data fitting module; the acquisition module 401 is also used to obtain the actual bus voltage measurement value of the air conditioner at different operating powers based on the phase voltage threshold; the calculation module 402 is also used 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 bus voltage difference of the air conditioner at different operating powers based on the actual bus voltage measurement value of the air conditioner at different operating powers and the no-load bus voltage of the air conditioner; the data fitting module is used to fit the corresponding relationship 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 obtain the target curve formula based on the corresponding relationship 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 configured 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 configured to calculate a no-load phase voltage peak value of the air conditioner based on the phase voltage threshold, and calculate the no-load bus voltage based on the no-load phase voltage peak value.

[0092] Optionally, the calculation module 402 is specifically configured to calculate a target difference between the no-load bus voltage and the target voltage difference, and 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 divider ratio and reduce the input voltage of the working circuit of the air conditioner 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 divider ratio and reduce the input voltage of the working circuit of the air conditioner 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 electric safety control device provided by the present 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 the target curve formula, the target voltage difference between the no-load bus voltage and the maximum bus voltage is calculated, and the no-load bus voltage of the air conditioner is calculated based on the phase voltage threshold; at the same time, according to the target voltage difference and the no-load bus voltage, the maximum bus voltage is calculated, and the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification is judged; finally, when the rectified input voltage is greater than the maximum bus voltage, the overvoltage protection strategy is executed. Among them, the target curve formula is used to indicate the corresponding relationship 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 voltage value actually input to the rectifier side can be accurately calculated, so that the air conditioner can accurately judge whether the current input voltage exceeds the range of safe electricity use, and take corresponding overvoltage protection measures in time.

[0096] Figure 5 The physical structure diagram of an electronic device is shown as an example. The electronic device may be the above-mentioned air conditioner. Figure 5As shown, the electronic device may include: a processor (processor) 510, a communication interface (CommunicationsInterface) 520, a memory (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 the logic instructions in the memory 530 to execute a three-phase electricity safety control method, which includes: obtaining the phase voltage threshold set for 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 the 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 judging the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; 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 corresponding relationship 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] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0098] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. 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 including: obtaining the phase voltage threshold set by 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, calculating the target voltage difference between the no-load bus voltage and the maximum bus voltage, 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 judging the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; 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 corresponding relationship 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] On the other hand, the present application also provides a computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the above-mentioned three-phase power safety control method, the method comprising: obtaining the phase voltage threshold set for 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 the 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 judging the relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; 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 corresponding relationship 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.

[0100] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0101] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment 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 the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A three-phase power safety control method, characterized in that: Applied to air conditioners, including: Acquiring a phase voltage threshold set for the air conditioner and a current operating power of the air conditioner; Based on the phase voltage threshold, the current operating power and the target curve formula, a target voltage difference between the no-load bus voltage and the maximum bus voltage is calculated, and the no-load bus voltage of the air conditioner is calculated 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; When the rectified input voltage is greater than the maximum bus voltage, executing an overvoltage protection strategy; Among them, the target curve formula is used to indicate the corresponding relationship 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.

2. The method according to claim 1, characterized in that 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: Acquire actual bus voltage measurement values ​​of the air conditioner at different operating powers based on the phase voltage threshold, and calculate 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 value of the air conditioner at different operating powers and the no-load bus voltage of the air conditioner; Based on the bus voltage difference of the air conditioner at different operating powers, the corresponding relationship between the output power of the air conditioner and the bus voltage difference of the air conditioner is fitted, and based on the corresponding relationship between the output power of the air conditioner and the bus voltage difference of the air conditioner, the target curve formula is obtained.

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

4. The method according to claim 1, characterized in that: The step of calculating the no-load bus voltage of the air conditioner based on the phase voltage threshold comprises: The no-load phase voltage peak value of the air conditioner is calculated based on the phase voltage threshold, and the no-load bus voltage is calculated based on the no-load phase voltage peak value.

5. The method according to claim 1, characterized in that The calculating the maximum bus voltage according to the target voltage difference and the no-load bus voltage includes: A target difference between the no-load bus voltage and the target voltage difference is calculated, and the target difference is determined as the maximum bus voltage.

6. The method according to claim 1, characterized in that When the rectified input voltage is greater than the maximum bus voltage, executing the overvoltage protection strategy 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 the first voltage difference, the voltage divider circuit of the air conditioner is controlled to adjust the voltage divider ratio to reduce the input voltage of the working circuit of the air conditioner.

7. The method according to claim 1 or 6, characterized in that: When the rectified input voltage is greater than the maximum bus voltage, executing the overvoltage protection strategy 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, and / or the indoor unit, and / or the outdoor unit of the air conditioner are controlled to shut down.

8. A three-phase electric safety control device, characterized in that: The device comprises: An acquisition module, used for acquiring a phase voltage threshold set for the air conditioner and a current operating power of the air conditioner; a calculation module, configured to calculate 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 calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; The calculation module is further used to calculate the maximum bus voltage according to the target voltage difference and the no-load bus voltage; A judging module, used for judging the magnitude relationship between the maximum bus voltage and the rectified input voltage of the air conditioner after rectification; A control module, configured to execute an overvoltage protection strategy when the rectifier input voltage is greater than the maximum bus voltage; Among them, the target curve formula is used to indicate the corresponding relationship 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.

9. The device according to claim 7, characterized in that The device also includes: a data fitting module; The acquisition module is further used to acquire the actual bus voltage measurement value of the air conditioner at different operating powers based on the phase voltage threshold; The calculation module is further used to calculate the no-load bus voltage of the air conditioner based on the phase voltage threshold; The calculation module is further used to calculate the bus voltage difference of the air conditioner at different operating powers based on the actual bus voltage measurement value of the air conditioner at different operating powers and the no-load bus voltage of the air conditioner; The data fitting module is used to fit the corresponding relationship 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 to obtain the target curve formula based on the corresponding relationship between the output power of the air conditioner and the bus voltage difference of the air conditioner.

10. An air conditioner, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the three-phase electric power safety control method as claimed in any one of claims 1 to 7 are implemented.

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