CN110707919A - PFC circuit control method and device and air conditioner - Google Patents
PFC circuit control method and device and air conditioner Download PDFInfo
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- CN110707919A CN110707919A CN201911096109.9A CN201911096109A CN110707919A CN 110707919 A CN110707919 A CN 110707919A CN 201911096109 A CN201911096109 A CN 201911096109A CN 110707919 A CN110707919 A CN 110707919A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application provides a PFC circuit control method, a PFC circuit control device and an air conditioner, wherein the PFC circuit control method is applied to the air conditioner and comprises the following steps: determining the required voltage of a rear-stage load of the PFC circuit; determining a target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range; the PFC circuit is adjusted so that the output voltage of the PFC circuit reaches a target voltage. According to the PFC circuit control method, firstly, the required voltage of a PFC rear-stage load is determined, then the target voltage of the PFC circuit is adaptively determined, the PFC circuit is adjusted, the output voltage of the PFC circuit reaches the target voltage, and therefore the PFC circuit can be adjusted according to the requirement of the load, on one hand, the rear-stage circuit can be guaranteed to work in a proper voltage environment, and on the other hand, the rear-stage circuit can be prevented from being in a high-voltage environment for a long time to protect the rear-stage circuit.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a PFC circuit control method and device and an air conditioner.
Background
Compared with a constant speed air conditioner, the variable frequency air conditioner is more widely applied, and adopts a magnetic synchronous compressor, so that the rotating speed of the compressor is adjustable, and the efficiency is high; in order to enable the compressor to operate at a higher rotating speed, the input voltage of a bus of the compressor needs to be increased, the PFC voltage needs to be controlled to boost, but the PFC voltage is increased to a certain level, which is difficult to determine, and if the PFC voltage is too low, the frequency of the compressor cannot operate at a high frequency, so that the user demand cannot be met; if the voltage of the PFC is too high, the lifetime of the electrolytic capacitor at the subsequent stage is affected, and the higher the voltage is, the more easily the electrolytic capacitor fails, so that the voltage of the PFC circuit cannot be reasonably determined, and the output of the PFC circuit cannot be adjusted according to the load requirement.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for controlling a PFC circuit, and an air conditioner, so as to solve the problem that the conventional air conditioner cannot adjust the output of the PFC circuit according to the load requirement.
The technical scheme adopted by the application is as follows:
in a first aspect, the present application provides a PFC circuit control method, which is applied to an air conditioner, and includes: determining the required voltage of a rear-stage load of the PFC circuit; determining a target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range; adjusting the PFC circuit to cause an output voltage of the PFC circuit to reach the target voltage. According to the PFC circuit control method, firstly, the required voltage of a PFC rear-stage load is determined, then the target voltage of the PFC circuit is adaptively determined, the PFC circuit is adjusted, the output voltage of the PFC circuit reaches the target voltage, and therefore the PFC circuit can be adjusted according to the requirement of the load, on one hand, the rear-stage circuit can be guaranteed to work in a proper voltage environment, and on the other hand, the rear-stage circuit can be prevented from being in a high-voltage environment for a long time to protect the rear-stage circuit.
Further, the post-stage load includes a compressor, and the step of determining the required voltage of the post-stage load of the PFC circuit includes: acquiring an input voltage peak value of the PFC circuit; determining real-time required voltage of the compressor according to d-axis voltage and q-axis voltage of the compressor; determining a correction demand voltage according to the real-time demand voltage; and determining the larger of the corrected demand voltage and the input voltage peak value as the demand voltage of the load. The PFC circuit load of the air conditioner is a compressor, the real-time required voltage of the compressor is determined according to the real-time d-axis voltage and the q-axis voltage of the compressor, the real-time required voltage of the compressor is determined by correction according to the real-time voltage of the compressor, and the required voltage is determined according to the actual requirement of the load.
Further, the step of calculating and determining a correction demand voltage according to the real-time demand voltage includes: determining the correction required voltage according to the real-time required voltage and a preset first correction coefficient, wherein the correction required voltage, the real-time required voltage and the first correction coefficient satisfy the following formula: load _ V is Comp _ V/K1, where Load _ V is the correction required voltage, Comp _ V is the real-time required voltage, and K1 is the first correction coefficient.
The step of calculating and determining the correction required voltage according to the real-time required voltage further comprises the steps of obtaining an actual output voltage of the PFC circuit, determining a correction voltage according to the actual output voltage, wherein the correction voltage and the actual output voltage Vdc meet the condition that Vdc _ buf is Vdc K2, wherein Vdc is the actual output voltage, Vdc _ buf is the correction voltage, K2 is a preset second correction coefficient, and determining a difference value between the real-time required voltage and the correction voltage according to a PI control algorithm, wherein the real-time required voltage, the correction voltage and the difference value meet the following formula of △ V Kp (Comp _ V-Vdc _ buf) + Comp _ Vdc _ buf, wherein delta V is the difference value, Comp _ V is the real-time required voltage, and Vdc _ buf is the correction voltage, and the sum of the input voltage and the correction voltage is determined.
Further, the step of determining the real-time demand voltage of the compressor according to the d-axis voltage and the q-axis voltage of the compressor includes: acquiring d-axis voltage and q-axis voltage of the compressor; determining the real-time required voltage according to the d-axis voltage and the q-axis voltage, wherein the real-time required voltage isThe time-demand voltage, the d-axis voltage and the q-axis voltage satisfy:in the formula, Comp _ V is the real-time required voltage, Vq is a q-axis voltage of the compressor, and Vd is a d-axis voltage of the compressor.
Further, the safe voltage range includes a safe voltage lower limit and a safe voltage upper limit, and the step of determining the target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range includes; determining the upper safe voltage limit as the target voltage when the demand voltage is higher than the upper safe voltage limit; determining the safe lower voltage limit as the target voltage when the required voltage is lower than the safe lower voltage limit; determining the required voltage as the target voltage when the required voltage is within the safe voltage range. By setting the safe voltage range, the PFC circuit is prevented from exceeding the safe range and causing damage or accidents.
In a second aspect, the present application further provides a PFC circuit control apparatus, which is applied to an air conditioner, and is configured to execute the PFC circuit control method described above, where the PFC circuit control apparatus includes: the processing module is used for determining the required voltage of the rear-stage load of the PFC circuit; the processing module is further used for determining a target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range; the adjusting module is used for adjusting the PFC circuit to enable the output voltage of the PFC circuit to reach the target voltage.
Further, the rear-stage load comprises a compressor, the processing module comprises an acquisition unit and a determination unit, and the acquisition unit is used for acquiring an input voltage peak value of the PFC circuit; the determining unit is used for determining the real-time demand voltage of the compressor; the determining unit is further used for calculating and determining a correction required voltage according to the real-time required voltage; the determining unit is further used for determining the larger of the corrected demand voltage and the input voltage peak value as the demand voltage of the load.
Further, the safe voltage range includes a safe lower voltage limit and a safe upper voltage limit, and the processing module is configured to determine the safe upper voltage limit as the target voltage when the required voltage is higher than the safe upper voltage limit; the processing module is further used for determining the safe lower voltage limit as the target voltage when the required voltage is lower than the safe lower voltage limit; the processing module is further configured to determine the required voltage as the target voltage when the required voltage is within the safe voltage range.
In a third aspect, the present application further provides an air conditioner comprising a processor configured to execute machine-readable instructions to perform the steps of the PFC circuit control method described above.
Drawings
Fig. 1 is a schematic block diagram of a PFC circuit;
fig. 2 is a flowchart of a PFC circuit control method according to an embodiment of the present disclosure;
fig. 3 is a flowchart of another PFC circuit control method according to an embodiment of the present disclosure;
fig. 4 is a flowchart of another PFC circuit control method according to an embodiment of the present disclosure;
fig. 5 is a flowchart of another PFC circuit control method according to an embodiment of the present disclosure;
fig. 6 is a flowchart of another PFC circuit control method according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of functional modules of a PFC circuit control apparatus according to an embodiment of the present disclosure;
fig. 8 is a functional block diagram of a processing module according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of an air conditioner according to an embodiment of the present application.
Icon: 200-PFC circuit control device; 210-a processing module; 211-an acquisition unit; 212-a determination unit; 220-a regulation module; 300-an air conditioner; 310-a processor; 320-a bus; 330-memory.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The frequency converter of the frequency conversion air conditioner automatically adjusts the operation frequency according to the conditions of power demand, ambient temperature and the like of an indoor unit, if a boost PFC circuit is not adopted, the harmonic wave of the input current of the frequency conversion air conditioner is increased when the load is heavy, the direct current voltage is greatly reduced, the highest voltage which can be output by the frequency converter is reduced, the compressor can only operate in the frequency range far lower than the highest design value, the boost PFC circuit can keep the stability of the direct current voltage, and the compressor can operate at a high rotating speed, so that the boost PFC circuit shown in figure 1 is generally adopted for the frequency conversion air conditioner, the compressor can be ensured to work in a high-frequency state, and the refrigerating or heating capacity of the air conditioner is improved.
In the operation process of the variable frequency air conditioner, in order to enable the compressor to operate at a higher rotating speed, the input voltage of a bus of the compressor needs to be increased, the voltage of the PFC circuit needs to be controlled to be increased, and the voltage of the PFC circuit is increased to a proper level. If the voltage of the PFC circuit is too low, the frequency of the compressor cannot run at high frequency, and the use requirement of a user cannot be met; if the voltage of the PFC circuit is too high, the lifetime of the electrolytic capacitor in the subsequent circuit is affected, and the higher the voltage is, the more easily the electrolytic capacitor fails, so how to reasonably calculate the voltage of the PFC circuit and reasonably control and adjust the PFC circuit becomes a technical problem to be solved urgently.
In order to solve the above problem, the present application provides a PFC circuit control method, and referring to fig. 2, fig. 2 shows a flowchart of the PFC circuit control method according to the embodiment of the present application, where the PFC circuit control method includes steps 110 to 130.
Step 110: and determining the required voltage of the load at the rear stage of the PFC circuit.
In the inverter air conditioner, a PFC circuit is adopted to provide high-voltage signals for devices such as a compressor, and the compressor is the PFC circuit. However, the operating frequency of the compressor needs to be automatically adjusted according to the power requirement of the indoor unit, the ambient temperature and other conditions, so the output of the PFC circuit should also be adjusted according to the actual requirement of the load of the subsequent stage, for example, the output voltage of the PFC circuit is determined according to the required voltage of the subsequent stage load.
Step 120: and determining the target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range.
After the required voltage of the rear-stage load of the PFC circuit is determined, the target voltage of the PFC circuit can be set according to the required voltage of the load, and the PFC circuit is adjusted in real time to adapt to the requirement of the rear-stage load. In the embodiment of the application, a safety voltage range is set, and after the required voltage of the load at the later stage of the PFC circuit is determined, the target voltage can be limited within the safety range according to the required voltage and the preset safety voltage range.
Step 130: the PFC circuit is adjusted so that the output voltage of the PFC circuit reaches a target voltage.
After the target voltage of the PFC circuit is determined, the PFC circuit is adjusted so that the output voltage of the PFC circuit reaches the target voltage, the voltage output by the PFC circuit is changed in a self-adaptive mode according to the requirement of the load, and the reliability of the rear-stage load is guaranteed.
The PFC circuit is provided with an IGBT, and the output voltage of the PFC circuit can reach the target voltage by controlling the on-off state of the IGBT to enable the output signal to reach the preset duty ratio.
According to the PFC circuit control method, the target voltage of the PFC circuit is set according to the voltage actually required by the rear-stage load of the PFC circuit and the preset safe voltage range, the output of the PFC circuit can be adjusted adaptively according to the actual requirement of the rear-stage load, the reliability of the system can be improved, the rear-stage load is prevented from working in a high-voltage or low-voltage environment for a long time, the safety and reliability of the rear-stage load are guaranteed, meanwhile, the target voltage of the PFC circuit is reasonably calculated according to the required voltage of the rear-stage load, and the rear-stage load such as a compressor can operate in a wider frequency range.
In the embodiment of the application, a safe voltage range is set for the PFC circuit, and the safe voltage range includes a safe upper voltage limit and a safe lower voltage limit. The upper limit of the safe voltage is determined according to the withstand voltage value, the design requirement and the reserved allowance of the rear-stage load circuit device; the safe lower voltage limit value is determined according to the design and requirements of a PFC circuit and a hardware circuit of a rear-stage load.
When the target voltage of the PFC circuit is determined according to the required voltage of the load and a preset safe voltage range, if the required voltage is higher than the upper limit of the safe voltage, the upper limit of the safe voltage is determined as the target voltage; if the required voltage is lower than the lower limit of the safe voltage, determining the lower limit of the safe voltage as the target voltage; and if the required voltage is within the safe voltage range, determining the required voltage as the target voltage.
By setting a reasonable safe voltage range, on the premise of ensuring the normal work of the rear-stage load and the PFC circuit, the output of the PFC circuit can be adaptively adjusted according to the requirement of the load, and the frequency range of the rear-stage load such as the running frequency of a compressor can be enlarged.
Based on fig. 2, the present embodiment provides another PFC circuit control method to explain how to determine the required voltage of the load at the subsequent stage of the PFC circuit, please refer to fig. 3, where step 110 includes the following sub-steps: step 110-1 to step 110-4.
Step 110-1: and acquiring the peak value of the input voltage of the PFC circuit.
The input voltage of the PFC circuit is sampled and obtained in real time, and the peak value of the input voltage of the PFC circuit is obtained, wherein the peak value of the input voltage refers to the maximum value of the input voltage within a certain time period. For example, the maximum value of the input voltage for a period from the time point at which the detection is started to the present time point.
Step 110-2: and determining the real-time required voltage of the compressor according to the d-axis voltage and the q-axis voltage of the compressor.
In the embodiment of the present application, the post-stage load of the PFC circuit includes a compressor, and the demand of the post-stage load is the demand of the compressor. For equipment such as a compressor, the internal signal of the equipment can be analyzed and calculated by using a dq coordinate system, and in the embodiment of the application, the real-time required voltage of the compressor can be determined according to the d-axis voltage and the q-axis voltage of the compressor.
Step 110-3: and determining the correction required voltage according to the real-time required voltage.
Since the implementation required voltage of the load is determined according to the current working condition of the load, in order to ensure that a certain margin is reserved for the subsequent load when the PFC circuit is regulated and controlled, the implementation required voltage needs to be corrected to obtain a corrected required voltage.
Step 110-4: and determining the larger of the corrected demand voltage and the input voltage peak value as the demand voltage of the load.
After the correction required voltage is determined, the larger one of the correction required voltage Load _ V and the input voltage peak value is determined as the Load required voltage so as to regulate and control the PFC circuit, and the larger one of the correction required voltage and the input voltage peak value is selected as the required voltage of the rear-stage Load of the PFC circuit, so that the rear-stage Load can be effectively ensured to work under a proper voltage level, and the normal work of the rear-stage Load is ensured.
To further explain how to determine the real-time required voltage of the compressor, referring to fig. 4 on the basis of fig. 3, the present embodiment provides another PFC circuit control method, and in the PFC circuit control method provided in the present embodiment, the step 110-2 specifically includes a step 110-2-1 to a step 110-2-2.
Step 110-2-1: the d-axis voltage and the q-axis voltage of the compressor are obtained.
In one possible embodiment, the phase current of the compressor is sampled and converted, the current is projected to a dq coordinate system, the d-axis current and the q-axis current of the compressor are obtained respectively, and then Pi operation is performed according to the d-axis current and the q-axis current to obtain a d-axis voltage and a q-axis voltage respectively.
Step 110-2-2: and determining the real-time required voltage according to the d-axis voltage and the q-axis voltage of the compressor.
In the embodiment of the present application, the real-time required voltage, the d-axis voltage and the q-axis voltage satisfy the following equation:
in the formula, VqIs the q-axis voltage, V, of the compressordThe d-axis voltage of the compressor, Comp _ V is the real-time demand voltage of the compressor.
Based on fig. 4 and referring to fig. 5, fig. 5 shows another PFC circuit control method provided in this embodiment of the present application, and in a possible implementation, step 110-3 specifically includes:
step 110-3-1: and determining the correction required voltage according to the real-time required voltage of the compressor and a preset first correction coefficient.
Determining a correction demand voltage according to the real-time demand voltage of the compressor and a preset first correction coefficient, wherein the correction demand voltage, the real-time demand voltage and the first correction coefficient satisfy the following formula:
where Comp _ V is the real-time demand voltage of the compressor, K1 is the first correction coefficient, and Load _ V is the corrected demand voltage. The first correction coefficient K1 may be set for each air conditioner model. Generally, the value of the first correction coefficient K1 can be set to a value between 0 and 1, the real-time required voltage is properly amplified to be used as the corrected required voltage, a certain margin is reserved, normal and efficient operation of the compressor is guaranteed, and meanwhile the purpose of adjusting the corrected required voltage can be achieved according to the adjustment of the first correction coefficient K1.
Based on fig. 4, referring to fig. 6, fig. 6 shows another PFC circuit control method provided in the embodiment of the present application, and in a possible implementation, step 110-3 specifically includes:
step 110-3-2: and acquiring the actual output voltage of the PFC circuit.
Step 110-3-3: and determining the correction voltage according to the actual output voltage.
In one possible embodiment, the correction voltage may be determined according to an actual output voltage of the PFC circuit, where the correction voltage and the actual output voltage satisfy:
Vdc_buf＝Vdc×K2。
in a possible implementation manner, if the correction voltage needs to be correspondingly adjusted, the purpose of adjusting the correction voltage can be achieved by adjusting the second correction coefficient K2.
Step 110-3-4: determining a difference value between the real-time required voltage and the correction voltage according to a PI control algorithm, wherein the real-time required voltage, the correction voltage and the difference value satisfy the following formula:
ΔV＝Kp*(Comp_V-Vdc_buf)+Ki*∫(Comp_V-Vdc_buf)。
in the formula, Δ V is a difference value between the real-time required voltage and the correction voltage, Comp _ V is the real-time required voltage of the compressor, and Vdc _ buf is the correction voltage output by the PFC circuit;
step 110-3-5: and determining the corrected demand voltage according to the sum of the input voltage peak value and the difference value.
In this embodiment, the correction required voltage is determined according to the input voltage peak value and the difference, and the input voltage peak value, the difference and the correction required voltage satisfy the following formula:
Load_V＝Vpeak+ΔV。
in the formula, Load _ V is the correction required voltage, Vpeak is the input voltage peak value, and Δ V is the difference between the real-time required voltage and the correction voltage.
It should be noted that fig. 5 and fig. 6 illustrate two different steps of the method for determining the corrected required voltage according to the real-time required voltage, including step 110-3-1 and step 110-3-2 to step 110-3-5, and in practical applications, the product may select any one of the 2 methods or steps to determine the corrected required voltage, which is not limited in this embodiment.
In order to execute the corresponding steps in the above embodiments and various possible implementation manners, an implementation manner of the PFC circuit control device is provided below. Referring to fig. 7 and fig. 7 are functional block diagrams of a PFC circuit control apparatus according to an embodiment of the present application, it should be noted that the basic principle and the technical effect of the PFC circuit control apparatus provided in the present embodiment are the same as those of the above embodiment, and for brief description, no mention is made in this embodiment, and reference may be made to corresponding contents in the above embodiment.
Referring to fig. 7, the PFC circuit control apparatus 200 includes a processing module 210 and a regulating module 220.
The processing module 210 may be specifically configured to determine a required voltage of a load at a later stage of the PFC circuit.
Optionally, the processing module 210 may be specifically configured to execute the step 110 in each of the above-mentioned figures, so as to achieve the corresponding technical effect.
The processing module 210 is further configured to determine a target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range.
Optionally, the processing module 210 may be specifically configured to execute the step 120 in each of the above-mentioned figures, so as to achieve the corresponding technical effect.
The adjusting module 220 is used for adjusting the PFC circuit so that the output voltage of the PFC circuit reaches a target voltage.
Optionally, the adjusting module 220 may be specifically configured to execute the step 130 in each of the above figures to achieve the corresponding technical effect.
On the basis of fig. 7, referring to fig. 8, fig. 8 shows a functional module schematic diagram of the processing module 210 according to the embodiment of the present application. The processing module 210 includes: an acquisition unit 211 and a determination unit 212.
The obtaining unit 211 is configured to obtain a peak value of an input voltage of the PFC circuit.
Optionally, the obtaining unit 211 may be specifically configured to execute step 110-1 in each of the above-mentioned figures, so as to achieve a corresponding technical effect.
The determination unit 212 is used to determine the real-time demand voltage of the compressor.
Optionally, the determining unit 212 may be specifically configured to execute step 110-2 in each of the above-mentioned figures, so as to achieve a corresponding technical effect.
In one possible embodiment, the determination unit 212 is specifically configured to determine the real-time demand voltage from the d-axis voltage and the q-axis voltage of the compressor. In the embodiment of the present application, the real-time required voltage, the d-axis voltage and the q-axis voltage satisfy the following equation:
in the formula, VqIs the q-axis voltage, V, of the compressordThe d-axis voltage of the compressor, Comp _ V is the real-time demand voltage of the compressor.
The determining unit 212 is further configured to calculate and determine a modified demand voltage according to the real-time demand voltage.
Optionally, the determining unit 212 may be specifically configured to execute step 110-3 in each of the above-mentioned figures, so as to achieve a corresponding technical effect.
In one possible embodiment, the determining unit 212 determines the correction demand voltage according to the real-time demand voltage of the compressor and a preset first correction coefficient. The correction demand voltage, the real-time demand voltage and the first correction coefficient satisfy the following formula:
where Comp _ V is the real-time demand voltage of the compressor, K1 is the first correction coefficient, and Load _ V is the corrected demand voltage. The first correction coefficient K1 may be set for each air conditioner model.
In another possible implementation, the determining unit 212 may further obtain an actual output voltage of the PFC circuit. And determining the correction voltage according to the actual output voltage. The correction voltage and the actual output voltage meet the following conditions:
Vdc_buf＝Vdc×K2。
where Vdc is an actual output voltage of the PFC circuit, Vdc _ buf is a correction voltage, and K2 is a second correction coefficient preset according to the type of the air conditioner. And then determining a difference value between the real-time required voltage and the correction voltage according to a PI control algorithm, wherein the real-time required voltage, the correction voltage and the difference value satisfy the following formula:
ΔV＝Kp*(Comp_V-Vdc_buf)+Ki*∫(Comp_V-Vdc_buf)。
in the formula, Δ V is a difference value between the real-time required voltage and the correction voltage, Comp _ V is the real-time required voltage of the compressor, and Vdc _ buf is the correction voltage output by the PFC circuit; after the difference is determined, the corrected demand voltage is determined by summing the peak value of the input voltage and the difference. The input voltage peak value, the difference value and the correction required voltage meet the following formula:
Load_V＝Vpeak+ΔV。
in the formula, Load _ V is the correction required voltage, Vpeak is the input voltage peak value, and Δ V is the difference between the real-time required voltage and the correction voltage.
The determining unit 212 is further configured to determine the larger of the modified demand voltage and the input voltage peak value as the demand voltage of the load.
Optionally, the determining unit 212 may be specifically configured to execute step 110-4 in each of the above-mentioned figures, so as to achieve a corresponding technical effect.
An air conditioner is further provided in the embodiment of the present application, and referring to fig. 9, fig. 9 shows a schematic block diagram of an air conditioner 300 provided in the embodiment of the present application. The air conditioner 300 includes a processor 310 and a memory 330. The processor 310 is coupled to the memory 330 by a bus 320.
The memory 330 is used to store a program, for example, the PFC circuit control apparatus 200 shown in fig. 7, the PFC circuit control apparatus 200 includes at least one software functional module which can be stored in the memory 330 in a form of software or firmware (firmware) or is solidified in an Operating System (OS) of the air conditioner 300, and the processor 310 executes the program after receiving an execution instruction to implement the PFC circuit control method disclosed in the above-mentioned embodiment of the invention.
The Memory 330 may include a Random Access Memory (RAM) and a non-volatile Memory (NVM).
The processor 310 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 310. The processor 310 may be a general-purpose processor, and includes a Central Processing Unit (CPU), a Micro Control Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an embedded ARM, and a single chip.
The memory 330 and the processor 310 may be separately provided or may be integrally provided in the same physical space, for example, the memory 330 may be integrally provided in the processor 310 to serve as an internal storage space of the processor 310.
The embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for controlling the PFC circuit disclosed in the above embodiment is implemented.
In summary, the present application provides a PFC circuit control method, an apparatus and an air conditioner, where the PFC circuit control method includes: determining the required voltage of a rear-stage load of the PFC circuit; determining a target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range; the PFC circuit is adjusted so that the output voltage of the PFC circuit reaches a target voltage. According to the PFC circuit control method, firstly, the required voltage of a PFC rear-stage load is determined, then the target voltage of the PFC circuit is adaptively determined, the PFC circuit is adjusted, the output voltage of the PFC circuit reaches the target voltage, and therefore the PFC circuit can be adjusted according to the requirement of the load, on one hand, the rear-stage circuit can be guaranteed to work in a proper voltage environment, and on the other hand, the rear-stage circuit can be prevented from being in a high-voltage environment for a long time to protect the rear-stage circuit.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A PFC circuit control method applied to an air conditioner (300), comprising:
determining the required voltage of a rear-stage load of the PFC circuit;
determining a target voltage of the PFC circuit according to the required voltage of the load and a preset safe voltage range;
adjusting the PFC circuit to cause an output voltage of the PFC circuit to reach the target voltage.
2. The PFC circuit control method of claim 1 wherein the post-stage load comprises a compressor, and the step of determining the required voltage of the PFC circuit post-stage load comprises:
acquiring an input voltage peak value of the PFC circuit;
determining real-time required voltage of the compressor according to d-axis voltage and q-axis voltage of the compressor;
determining a correction demand voltage according to the real-time demand voltage;
and determining the larger of the corrected demand voltage and the input voltage peak value as the demand voltage of the load.
3. The PFC circuit control method of claim 2 wherein the step of calculating a determination correction demand voltage from the real-time demand voltage comprises:
determining the correction required voltage according to the real-time required voltage and a preset first correction coefficient, wherein the correction required voltage, the real-time required voltage and the first correction coefficient satisfy the following formula:
load _ V is Comp _ V/K1, where Load _ V is the correction required voltage, Comp _ V is the real-time required voltage, and K1 is the first correction coefficient.
4. The PFC circuit control method of claim 2 wherein the step of calculating a determination correction demand voltage from the real-time demand voltage comprises:
acquiring the actual output voltage of the PFC circuit;
determining a correction voltage according to the actual output voltage, wherein the correction voltage and the actual output voltage Vdc satisfy:
vdc _ buf-K2, where Vdc is the actual output voltage, Vdc _ buf is the correction voltage, and K2 is a preset second correction coefficient;
determining a difference value between the real-time demand voltage and the correction voltage according to a PI control algorithm, wherein the real-time demand voltage, the correction voltage and the difference value satisfy the following formula:
Δ V ═ Kp (Comp _ V-Vdc _ buf) + Ki ═ jpc (Comp _ V-Vdc _ buf); wherein Δ V is the difference, Comp _ V is the real-time demand voltage;
and determining the corrected demand voltage according to the sum of the input voltage peak value and the difference value.
5. The PFC circuit control method according to any one of claims 2 to 4, wherein the step of determining the real-time required voltage of the compressor according to the d-axis voltage and the q-axis voltage of the compressor comprises:
acquiring d-axis voltage and q-axis voltage of the compressor;
determining the real-time required voltage according to the d-axis voltage and the q-axis voltage, wherein the real-time required voltage, the d-axis voltage and the q-axis voltage meet the following requirements:
6. The PFC circuit control method of claim 1, wherein the safety voltage range includes a safety lower voltage limit and a safety upper voltage limit, and the step of determining the target voltage of the PFC circuit according to the required voltage of the load and a preset safety voltage range includes;
determining the upper safe voltage limit as the target voltage when the demand voltage is higher than the upper safe voltage limit;
determining the safe lower voltage limit as the target voltage when the required voltage is lower than the safe lower voltage limit;
determining the required voltage as the target voltage when the required voltage is within the safe voltage range.
7. A PFC circuit control device (200), wherein the PFC circuit control device (200) is applied to an air conditioner (300), the PFC circuit control device (200) is used for executing the PFC circuit control method of any one of claims 1-6, and the PFC circuit control device (200) comprises:
a processing module (210) for determining a required voltage of a load at a later stage of the PFC circuit;
the processing module (210) is further configured to determine a target voltage of the PFC circuit according to a required voltage of the load and a preset safe voltage range;
a regulating module (220) for regulating the PFC circuit to make the output voltage of the PFC circuit reach the target voltage.
8. The PFC circuit control apparatus of claim 7, wherein the post-stage load comprises a compressor, the processing module (210) comprises an acquisition unit (211) and a determination unit (212),
the acquisition unit (211) is used for acquiring an input voltage peak value of the PFC circuit;
the determination unit (212) is used for determining the real-time demand voltage of the compressor;
the determining unit (212) is further used for calculating and determining a correction demand voltage according to the real-time demand voltage;
the determination unit (212) is further configured to determine the larger of the modified demand voltage and the input voltage peak value as the demand voltage of the load.
9. The PFC circuit control device of claim 7, wherein the safe voltage range includes a safe lower voltage limit and a safe upper voltage limit,
the processing module (210) is configured to determine the upper safe voltage limit as the target voltage when the demand voltage is higher than the upper safe voltage limit;
the processing module (210) is further configured to determine the lower safe voltage limit as the target voltage when the required voltage is lower than the lower safe voltage limit;
the processing module (210) is further configured to determine the demanded voltage as the target voltage when the demanded voltage is within the safe voltage range.
10. An air conditioner, characterized in that the air conditioner (300) comprises a processor for executing machine readable instructions to perform the steps of the PFC circuit control method according to any of claims 1 to 6.
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| CN111720947A (en) * | 2020-06-19 | 2020-09-29 | 海信（山东）空调有限公司 | Method for controlling bus voltage of air conditioner, air conditioner and storage medium |
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| CN110707919B (en) | 2020-11-03 |
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