CN114157133B - Power factor self-adaptive control method and device, storage medium and air conditioner - Google Patents
Power factor self-adaptive control method and device, storage medium and air conditioner Download PDFInfo
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- CN114157133B CN114157133B CN202111347136.6A CN202111347136A CN114157133B CN 114157133 B CN114157133 B CN 114157133B CN 202111347136 A CN202111347136 A CN 202111347136A CN 114157133 B CN114157133 B CN 114157133B
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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
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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
Abstract
The invention discloses a power factor self-adaptive control method, a device, a storage medium and an air conditioner, wherein the air conditioner comprises a power factor control circuit, and the method comprises the following steps: determining the frequency of a power supply; selecting a target PFC pulse control parameter set corresponding to the frequency from the PFC pulse control parameter set according to the frequency; acquiring the current of a main power supply loop of the power factor control circuit; obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set; and controlling the power factor control circuit according to the pulse control parameters. The method realizes the self-adaptive control of the power factor control circuit on the alternating current power supplies with different frequencies, so that the whole variable-frequency air conditioner product can be used for conveniently producing, selling and using by users without distinguishing the power supply frequency and dividing the selling areas, and meanwhile, the control effect of the power factor control circuit can be improved.
Description
Technical Field
The present invention relates to the field of air conditioners, and in particular, to a power factor adaptive control method and apparatus, a storage medium, and an air conditioner.
Background
The global commercial power supply mainly comprises a power supply with two frequencies of 60Hz and 50 Hz. In some areas, such as japan, there are power supplies with frequencies of 50Hz and 60Hz at the same time, and 50Hz is used in china, europe, etc., and 60Hz is used in most of australia, america, etc.
The existing air conditioner does not have the capability of automatically identifying and adapting to the 50Hz or 60Hz power supply, and the frequency of the power supply needs to be confirmed in advance and corresponding treatment is carried out, namely, the air conditioner product with 50Hz power supply cannot be applied to the 60Hz power supply, and vice versa. Correspondingly, the control parameters of the single-pulse power factor control circuit are different according to different power supply frequencies, so that the situation causes that the control scheme of PFC which is sensitive to the power supply frequency value cannot be considered at the same time, and the adaptability is poor, for example, the open-loop control pulse chopping PFC control scheme is adopted, the chopping pulse parameters of the chopping PFC control scheme are greatly influenced by the power supply frequency, and therefore, how to enable a variable-frequency air conditioner product to automatically identify and adapt to the frequency of the power supply is a problem to be solved.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention aims to provide a power factor self-adaptive control method, a device, a storage medium and an air conditioner.
The invention provides a power factor self-adaptive control method, which is used for an air conditioner, wherein the air conditioner comprises a power factor control circuit, and the method comprises the following steps:
determining the frequency of a power supply;
selecting a target PFC pulse control parameter set corresponding to the frequency from a PFC pulse control parameter set according to the frequency, wherein the PFC pulse control parameter set comprises a plurality of PFC pulse control parameter sets corresponding to a plurality of different power supply frequencies;
acquiring the current of a main power supply loop of the power factor control circuit;
obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set;
and controlling the power factor control circuit according to the pulse control parameters.
In addition, the power factor self-adaptive control method according to the embodiment of the invention can also have the following additional technical characteristics:
further, the determining the frequency of the power supply includes:
detecting a zero crossing signal of the power supply;
determining a time interval between two consecutive zero crossing signals;
and determining the frequency of the power supply according to the time interval.
Further, the determining the frequency of the power supply according to the time interval includes:
if the time interval is greater than or equal to the difference between the first preset time and the preset correction value and is less than or equal to the sum of the first preset time and the preset correction value, determining the frequency of the power supply as a first frequency;
if the time interval is greater than or equal to the difference between the second preset time and the preset correction value and is less than or equal to the sum of the second preset time and the preset correction value, determining the frequency of the power supply as a second frequency;
wherein the first preset time is greater than the second preset time, and the first frequency is less than the second frequency.
Further, the pulse control parameters include: the chopper delay on time and chopper on time, the pulse control parameters corresponding to the power factor control circuit are obtained according to the current and the target PFC pulse control parameter group, and the method comprises the following steps:
according to the target PFC pulse control parameter set, a first function curve containing the corresponding relation between the current and the chopper delay on time is determined, and a second function curve containing the corresponding relation between the current and the chopper on time is determined;
inquiring the first function curve according to the current to obtain the delay turn-on time of the chopper;
and inquiring the second function curve according to the current to obtain the breakover time of the chopper tube.
Further, the determining a first function curve including a correspondence between current and chopper delay on time, and determining a second function curve including a correspondence between current and chopper on time includes:
determining a plurality of parameter intervals in the target PFC pulse control parameter set, wherein each parameter interval comprises a corresponding relation between a group of current-chopper delay on time and chopper on time;
using the upper boundary current value of each parameter interval and the chopper delay turn-on time corresponding to each parameter interval as interpolation points, and fitting to obtain the first function curve; and fitting by taking the upper boundary current value of each parameter interval and the conduction time of the chopper tube corresponding to each parameter interval as interpolation points to obtain the second function curve.
Further, the controlling the power factor control circuit according to the pulse control parameter includes:
and controlling the chopper tube in the power factor control circuit to be turned on according to the delay turn-on time of the chopper tube, and continuously conducting the turn-on time of the chopper tube.
Further, determining a plurality of parameter intervals in the target PFC pulse control parameter set includes:
if the current is in the ascending trend, taking the sum of the current and a preset current return difference as a correction current, and judging a parameter interval according to the correction current;
and if the current is in a descending trend, taking the difference between the current and a preset current return difference as a correction current, and judging a parameter interval according to the correction current.
According to the power factor self-adaptive control method, the frequency of the power supply is automatically identified, the target PFC pulse control parameter set is selected from the PFC pulse control parameter set according to the power supply frequency, then the pulse control parameters corresponding to the main power supply loop current are selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the self-adaptive control of the power factor control circuit on alternating current power supplies with different frequencies is realized, the frequency conversion air conditioner complete machine product can be used conveniently for production, sales and user use without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
In order to solve the above-mentioned problems, the present invention further provides a power factor adaptive control device, which is used for an air conditioner, wherein the air conditioner comprises a power factor control circuit, and the device comprises:
the first determining module is used for determining the frequency of the power supply;
a selecting module, configured to select a target PFC pulse control parameter set corresponding to the frequency from a PFC pulse control parameter set according to the frequency, where the PFC pulse control parameter set includes a plurality of PFC pulse control parameter sets corresponding to a plurality of different power supply frequencies;
the acquisition module is used for acquiring the current of the main power supply loop of the power factor control circuit;
the second determining module is used for obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set;
and the control module is used for controlling the power factor control circuit according to the pulse control parameters.
According to the power factor self-adaptive control device, the frequency of the power supply is automatically identified, the target PFC pulse control parameter set is selected from the PFC pulse control parameter set according to the power supply frequency, then the pulse control parameters corresponding to the main power supply loop current are selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the self-adaptive control of the power factor control circuit on alternating current power supplies with different frequencies is realized, the frequency conversion air conditioner complete machine product can be used conveniently for production, sales and user use without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
In view of the foregoing, the present invention further proposes a computer-readable storage medium having a power factor adaptive control program stored thereon, where the power factor adaptive control program, when executed by a processor, implements a power factor adaptive control method according to any one of the foregoing embodiments.
According to the computer readable storage medium, when the power factor self-adaptive control program stored on the computer readable storage medium is executed by a processor, the frequency of a power supply is automatically identified, a target PFC pulse control parameter set is selected from a PFC pulse control parameter set according to the power supply frequency, then a pulse control parameter corresponding to the main power supply loop current is selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the self-adaptive control of the power factor control circuit on alternating current power supplies with different frequencies is realized, the frequency conversion air conditioner whole machine product can be used conveniently for production, sales and users without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
In order to solve the above-mentioned problems, the present invention further provides an air conditioner, including:
the power factor adaptive control device according to the above embodiment; or alternatively, the process may be performed,
a processor;
a memory;
a power factor adaptive control program stored on the memory and executable on the processor, which when executed by the processor implements a power factor adaptive control method as described in any of the embodiments above.
According to the air conditioner provided by the embodiment of the invention, the frequency of the power supply is automatically identified, the target PFC pulse control parameter set is selected from the PFC pulse control parameter set according to the power supply frequency, then the pulse control parameter corresponding to the main power supply loop current is selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the power factor control circuit can adaptively control alternating current power supplies with different frequencies, the frequency conversion air conditioner complete machine product can be used conveniently for production, sales and user use without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a flow chart of a power factor adaptive control method according to one embodiment of the present invention;
fig. 2 is a schematic diagram of a power factor control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power factor control circuit according to another embodiment of the present invention;
FIG. 4 is a functional block diagram of automatic identification of power supply frequency according to one embodiment of the invention;
FIG. 5 is a schematic diagram of a fitted function of chopper delay on time and on time in accordance with one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a power factor adaptive control apparatus according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
A power factor adaptive control method, apparatus, storage medium, and air conditioner according to an embodiment of the present invention are described below with reference to fig. 1 to 6.
Fig. 1 is a flowchart of a power factor adaptive control method according to an embodiment of the present invention. As shown in fig. 1, a power factor adaptive control method for an air conditioner including a power factor control circuit, i.e., PFC (Power Factor Correction ) control circuit, includes the steps of:
and S1, determining the frequency of the power supply. For example, it is determined whether the frequency of the power supply is 50Hz or 60Hz.
And S2, selecting a target PFC pulse control parameter set corresponding to the frequency from the PFC pulse control parameter set according to the frequency, wherein the PFC pulse control parameter set is a preset parameter set which comprises a plurality of PFC pulse control parameter sets corresponding to a plurality of different power supply frequencies. Further, a set of PFC pulse control parameters corresponding to the determined frequency is selected based on the determined frequency. For example, if the determined frequency is 50Hz, then a PFC pulse control parameter set corresponding to 50Hz is selected; the determined frequency is 60Hz, then a set of PFC pulse control parameters corresponding to 60Hz is selected.
And step S3, acquiring the current of a main power supply loop of the power factor control circuit. In particular, the current flowing through the main supply loop may be obtained by a current sensor or other method that may be used to calculate the current of the circuit, etc.
And S4, obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set.
And S5, controlling the power factor control circuit according to the pulse control parameters.
Specifically, the embodiment of the invention can realize the self-adaptive control of the power factor control circuit to the alternating current power supplies with different frequencies by automatically identifying the frequency of the power supply and selecting the target PFC pulse control parameter group corresponding to the frequency from the PFC pulse control parameter set according to the power supply frequency and then selecting the pulse control parameter corresponding to the main power supply loop current from the target PFC pulse control parameter group according to the acquired main power supply loop current of the power factor control circuit. The method can be applied to variable frequency air conditioner products based on alternating current power supply input of different power supply frequencies (such as 50Hz and 60 Hz), achieves the purposes of one-time development and multi-machine application, greatly shortens the development period, reduces the development cost, ensures that the whole variable frequency air conditioner products can be used conveniently for production, sales and user use without distinguishing the power supply frequency and dividing the sales area, and can improve the PFC control effect.
In one embodiment of the invention, determining the frequency of the power supply comprises the steps of:
and S11, detecting a zero crossing signal of the power supply.
Step S12 of determining a time interval between consecutive zero crossing signals.
And step S13, determining the frequency of the power supply according to the time interval.
In one embodiment of the invention, determining the frequency of the power supply according to the time interval comprises:
if the time interval is greater than or equal to the difference between the first preset time and the preset correction value and is less than or equal to the sum of the first preset time and the preset correction value, determining the frequency of the power supply as a first frequency;
if the time interval is greater than or equal to the difference between the second preset time and the preset correction value and is less than or equal to the sum of the second preset time and the preset correction value, determining the frequency of the power supply as a second frequency;
the first preset time is longer than the second preset time, and the first frequency is smaller than the second frequency.
In a specific embodiment, detecting zero crossing signals of a mains supply (i.e. a power supply), and timing two continuous zero crossing signals to obtain a timing time, for example, tc, i.e. an immediate interval, and if the timing time Tc is in a section [10-t,10+t ] ms, i.e. a first preset time is 10ms, and a preset correction value is tms, judging that the frequency of the power supply is a first frequency, for example, 50Hz; if the counted time is within the interval [8.33-t,8.33+t ] ms, i.e. the second preset time is 8.33ms, and the preset correction value is tms, the frequency of the power supply is judged to be the second frequency, for example 60Hz. In a specific example, the preset correction value t is a positive number not greater than 0.8.
In one embodiment of the invention, the pulse control parameters include: the chopper delay on time and the chopper on time, according to the current and the target PFC pulse control parameter group, the pulse control parameter corresponding to the power factor control circuit is obtained, and the method comprises the following steps:
s41, determining a first function curve containing the corresponding relation between the current and the delay on time of the chopper according to the target PFC pulse control parameter set, and determining a second function curve containing the corresponding relation between the current and the on time of the chopper;
step S42, inquiring a first function curve according to the current to obtain the delay turn-on time of the chopper;
and S43, inquiring a second function curve according to the current to obtain the conduction time of the chopper tube.
In a specific embodiment, as shown in fig. 2 and 3, the power factor control circuit includes a general reactor L01, a rectifier bridge VC01/VC02, a chopper V01, a main control unit MCU, and a current detection unit Iac of a main power supply loop. As shown in fig. 4, the main control unit includes: the power supply comprises a zero-crossing detection and timing unit COUNTER, a 50Hz and 60Hz power supply frequency identification unit SELECTOR, a PFC pulse parameter set REF-50Hz corresponding to a 50Hz frequency power supply, a PFC pulse parameter set REF-60Hz corresponding to a 60Hz frequency power supply and a PFC-PWM unit for generating chopped waveforms. It will be appreciated that a first function curve comprising a correspondence between current and chopper delay on time may be determined from the PFC pulse control parameter set, and a second function curve comprising a correspondence between current and chopper on time may be determined. According to a real-time detection current value I provided by a current detection unit Iac of a main power supply loop, inquiring a first function curve and a second function curve to obtain chopper delay on time T1 and chopper on time T2, and then a PFC-PWM unit generates PFC pulses according to the values of T1 and T2 to control the on and off time of a chopper so as to realize chopper control to control a power factor control circuit.
For example, to achieve frequency adaptation of two power supplies of 50/60Hz, two sets of different pulse parameters are provided, adapted to the corresponding power supply frequency of 50/60 Hz. If the zero-crossing detection and timing unit COUNTER determines that the frequency of the power supply is 50Hz, the identification unit SELECTOR selects corresponding T1 and T2 parameters in the PFC pulse control parameter set REF-50Hz according to the current value I, namely pulse control parameters; if the frequency of the power supply is 60Hz, the identification unit SELECTOR selects corresponding T1 and T2 parameters in the PFC pulse control parameter set REF-60Hz according to the current value I, and then the PFC-PWM unit generates PFC pulses according to the T1 and T2 values so as to control the power factor control circuit, namely automatically identify the frequency of the power supply and realize pulse chopping control of the power factor control circuit.
In one embodiment of the invention, determining a first function curve comprising a correspondence between current and chopper delay on-time and determining a second function curve comprising a correspondence between current and chopper on-time comprises:
step S411, determining a plurality of parameter intervals in a target PFC pulse control parameter set, wherein each parameter interval comprises a group of corresponding relations of current-chopper delay on time-chopper on time;
step S412, fitting to obtain a first function curve by taking the upper boundary current value of each parameter interval and the chopper delay on time corresponding to each parameter interval as interpolation points; and fitting by taking the upper boundary current value of each parameter interval and the conduction time of the chopper tube corresponding to each parameter interval as interpolation points to obtain a second function curve.
Specifically, as shown in fig. 5, in order to thoroughly eliminate the pulse control parameter fluctuation caused by the current fluctuation, the linear interpolation process is performed with the parameters in the pulse control parameter set as reference points, where T1 is one interpolation function and T2 is another interpolation function. Specifically, boundary current values on the 1 interval, the 2 interval, the … … interval and the n interval In the parameter table are recorded as I1, I2, … … and In, I1, I2, I3, … … and In and corresponding T1 values are taken as interpolation points, a function curve of the currents I and T1, namely a first function curve, is obtained by fitting, and a function curve of the currents I and T2, namely a second function curve, is obtained by the same.
In one embodiment of the present invention, controlling a power factor control circuit according to a pulse control parameter includes:
and controlling the chopper tube in the power factor control circuit to be turned on according to the delay turn-on time of the chopper tube, and continuously turning on the conduction time of the chopper tube.
In a specific embodiment, the delay on time of the chopper is, for example, T1, and the on time of the chopper is, for example, T2, and then the zero crossing signal is used as a reference, and after the delay T1 time, the chopper V01 is controlled to be turned on, and the chopper is controlled to be continuously turned on for T2 time.
In one embodiment of the present invention, a method of determining a plurality of parameter intervals in a target PFC pulse control parameter set not by using a method of fitting a curve but by using a return difference control method includes:
if the current is in the ascending trend, taking the sum of the current and the preset current return difference as the correction current, and judging a parameter interval according to the correction current;
if the current is in the descending trend, taking the difference between the current and the preset current return difference as the correction current, and judging the parameter interval according to the correction current.
In a specific embodiment, a plurality of parameter intervals are divided according to the current of the main power supply loop, so that each parameter interval comprises a group of corresponding relation of the delay on time of the current-chopping tube and the on time of the chopping tube, namely, the current is divided into n intervals from 0 to Imax (the maximum value of the current of the main power supply loop), n is a natural number, each interval corresponds to a group of different T1 and T2 values, namely, the delayed on time of the chopping tube and the on time of the chopping tube, the n groups of parameters form a control parameter group, then the corresponding PFC pulse control parameters T1 and T2 values are determined according to the interval in which the current value is detected by the current detection unit Iac of the main power supply loop, and PFC pulses are generated according to the T1 and T2 values, so that the power factor control circuit is controlled, namely, the frequency of a power supply source is automatically identified, and pulse chopping control of the power factor control circuit is realized.
Further, since the current value of the main power supply loop is divided into n sections, which may cause parameter fluctuation when the current varies among the different sections, a preset current return difference control is set to reduce the influence of the fluctuation, and the preset current return difference is, for example, Δi, where Δi is a constant. When the current is in an ascending trend, the current takes the sum of the measured value I and the delta I as a new value, namely the current is corrected, and the parameter interval judgment is carried out; if the current is in the descending trend, the current takes the difference of the measured value I and the delta I as a new value, and the parameter interval judgment is carried out.
According to the power factor self-adaptive control method, the frequency of the power supply is automatically identified, the target PFC pulse control parameter set is selected from the PFC pulse control parameter set according to the power supply frequency, then the pulse control parameters corresponding to the main power supply loop current are selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the self-adaptive control of the power factor control circuit on alternating current power supplies with different frequencies is realized, the frequency conversion air conditioner complete machine product can be used conveniently for production, sales and user use without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
The further embodiment of the invention also discloses a power factor self-adaptive control device which is used for the air conditioner, and the air conditioner comprises a power factor control circuit. Fig. 6 is a schematic structural diagram of a power factor adaptive control apparatus according to an embodiment of the present invention, and as shown in fig. 6, the apparatus 10 includes: the system comprises a first determining module 11, a selecting module 12, an acquiring module 13, a second determining module 14 and a control module 15.
Wherein, the first determining module 11 is configured to determine a frequency of the power supply.
A selection module 12 is configured to select a target PFC pulse control parameter set corresponding to a frequency from PFC pulse control parameter sets according to the frequency, where the PFC pulse control parameter set includes a plurality of PFC pulse control parameter sets corresponding to a plurality of different power supply frequencies.
And the acquisition module 13 is used for acquiring the current of the main power supply loop of the power factor control circuit.
The second determining module 14 is configured to obtain a pulse control parameter corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set.
And the control module 15 is used for controlling the power factor control circuit according to the pulse control parameters.
In one embodiment of the present invention, the first determining module 11 determines a frequency of the power supply, including:
detecting a zero crossing signal of a power supply;
determining a time interval between two consecutive zero crossing signals;
and determining the frequency of the power supply according to the time interval.
In one embodiment of the present invention, the first determining module 11 determines the frequency of the power supply according to the time interval, including:
if the time interval is greater than or equal to the difference between the first preset time and the preset correction value and is less than or equal to the sum of the first preset time and the preset correction value, determining the frequency of the power supply as a first frequency;
if the time interval is greater than or equal to the difference between the second preset time and the preset correction value and is less than or equal to the sum of the second preset time and the preset correction value, determining the frequency of the power supply as a second frequency;
the first preset time is longer than the second preset time, and the first frequency is smaller than the second frequency.
In one embodiment of the invention, the pulse control parameters include: the chopper delay on time and chopper on time, the second determining module 14 obtains pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set, including:
according to the target PFC pulse control parameter set, a first function curve containing the corresponding relation between the current and the chopper delay on time is determined, and a second function curve containing the corresponding relation between the current and the chopper on time is determined;
inquiring a first function curve according to the current to obtain the delay turn-on time of the chopper;
and inquiring a second function curve according to the current to obtain the conduction time of the chopper tube.
In one embodiment of the present invention, the second determining module 14 determines a first function curve including a correspondence between current and chopper delay on time, and determines a second function curve including a correspondence between current and chopper on time, including:
determining a plurality of parameter intervals in a target PFC pulse control parameter set, wherein each parameter interval comprises a corresponding relation between a group of current-chopper delay on time and chopper on time;
taking the upper boundary current value of each parameter interval and the chopper delay turn-on time corresponding to each parameter interval as interpolation points, and fitting to obtain a first function curve; and fitting by taking the upper boundary current value of each parameter interval and the conduction time of the chopper tube corresponding to each parameter interval as interpolation points to obtain a second function curve.
In one embodiment of the present invention, the control module 15 controls the power factor control circuit according to the pulse control parameter, including:
and controlling the chopper tube in the power factor control circuit to be turned on according to the delay turn-on time of the chopper tube, and continuously turning on the conduction time of the chopper tube.
In one embodiment of the present invention, the second determining module 14 determines a plurality of parameter intervals in the target PFC pulse control parameter set, including:
if the current is in the ascending trend, taking the sum of the current and the preset current return difference as the correction current, and judging a parameter interval according to the correction current;
if the current is in the descending trend, taking the difference between the current and the preset current return difference as the correction current, and judging the parameter interval according to the correction current.
It should be noted that, when the power factor adaptive control device 10 according to the embodiment of the present invention performs power factor adaptive control, the specific implementation manner is similar to that of the power factor adaptive control method according to the embodiment of the present invention, and specific reference is made to the description of the method section, so that redundancy is reduced and no redundant description is given here.
According to the power factor self-adaptive control device 10 of the embodiment of the invention, the device 10 automatically identifies the frequency of a power supply, selects a target PFC pulse control parameter set from a PFC pulse control parameter set according to the power supply frequency, then selects a pulse control parameter corresponding to the main power supply loop current from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, and realizes the self-adaptive control of the power factor control circuit on alternating current power supplies with different frequencies, so that the frequency conversion air conditioner complete machine product can be used for conveniently producing, selling and using without distinguishing the power supply frequency and dividing the selling area, and meanwhile, the control effect of the power factor control circuit can be improved.
Further embodiments of the present invention also disclose a computer readable storage medium having stored thereon a power factor adaptive control program which when executed by a processor implements a power factor adaptive control method as described in any of the above embodiments.
According to the computer readable storage medium, when the power factor self-adaptive control program stored on the computer readable storage medium is executed by a processor, the frequency of a power supply is automatically identified, a target PFC pulse control parameter set is selected from a PFC pulse control parameter set according to the power supply frequency, then a pulse control parameter corresponding to the main power supply loop current is selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the self-adaptive control of the power factor control circuit on alternating current power supplies with different frequencies is realized, the frequency conversion air conditioner whole machine product can be used conveniently for production, sales and users without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
The further embodiment of the invention also discloses an air conditioner.
In some embodiments, the air conditioner includes the power factor adaptive control device 10 as described in any of the embodiments above. Namely, the air conditioner may include: a first determining module 11 for determining the frequency of the power supply; and a selection module 12 for selecting a target PFC pulse control parameter set corresponding to a frequency from the PFC pulse control parameter set according to the frequency; and an acquisition module 13 for acquiring the current of the main power supply loop of the power factor control circuit, a second determination module 14 for obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set, and a control module 15 for controlling the power factor control circuit according to the pulse control parameters. Thus, in some embodiments, when the air conditioner is used for power factor adaptive control, the specific implementation manner is similar to that of the power factor adaptive control apparatus 10 described in any of the above embodiments of the present invention, and reference may be made to the foregoing description of the apparatus 10, so that redundancy is reduced and details are not repeated herein.
In other embodiments, the air conditioner includes a processor, a memory, and a power factor adaptive control program stored on the memory and executable on the processor, which when executed by the processor implements the power factor adaptive control method as described in any of the embodiments above.
According to the air conditioner provided by the embodiment of the invention, the frequency of the power supply is automatically identified, the target PFC pulse control parameter set is selected from the PFC pulse control parameter set according to the power supply frequency, then the pulse control parameter corresponding to the main power supply loop current is selected from the target PFC pulse control parameter set according to the acquired main power supply loop current of the power factor control circuit, so that the power factor control circuit can adaptively control alternating current power supplies with different frequencies, the frequency conversion air conditioner complete machine product can be used conveniently for production, sales and user use without distinguishing the power supply frequency and dividing the sales area, and meanwhile, the control effect of the power factor control circuit can be improved.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A power factor adaptive control method for an air conditioner, the air conditioner including a power factor control circuit, the method comprising the steps of:
determining the frequency of a power supply;
selecting a target PFC pulse control parameter set corresponding to the frequency from a PFC pulse control parameter set according to the frequency, wherein the PFC pulse control parameter set comprises a plurality of PFC pulse control parameter sets corresponding to a plurality of different power supply frequencies;
acquiring the current of a main power supply loop of the power factor control circuit;
obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set;
and controlling the power factor control circuit according to the pulse control parameters.
2. The power factor adaptive control method according to claim 1, wherein the determining the frequency of the power supply includes:
detecting a zero crossing signal of the power supply;
determining a time interval between two consecutive zero crossing signals;
and determining the frequency of the power supply according to the time interval.
3. The power factor adaptive control method according to claim 2, wherein the determining the frequency of the power supply according to the time interval includes:
if the time interval is greater than or equal to the difference between the first preset time and the preset correction value and is less than or equal to the sum of the first preset time and the preset correction value, determining the frequency of the power supply as a first frequency;
if the time interval is greater than or equal to the difference between the second preset time and the preset correction value and is less than or equal to the sum of the second preset time and the preset correction value, determining the frequency of the power supply as a second frequency;
wherein the first preset time is greater than the second preset time, and the first frequency is less than the second frequency.
4. A power factor adaptive control method according to any of claims 1-3, characterized in that the pulse control parameters comprise: the chopper delay on time and chopper on time, the pulse control parameters corresponding to the power factor control circuit are obtained according to the current and the target PFC pulse control parameter group, and the method comprises the following steps:
according to the target PFC pulse control parameter set, a first function curve containing the corresponding relation between the current and the chopper delay on time is determined, and a second function curve containing the corresponding relation between the current and the chopper on time is determined;
inquiring the first function curve according to the current to obtain the delay turn-on time of the chopper;
and inquiring the second function curve according to the current to obtain the breakover time of the chopper tube.
5. The method of claim 4, wherein determining a first function curve including a correspondence between current and chopper delay on time and determining a second function curve including a correspondence between current and chopper on time includes:
determining a plurality of parameter intervals in the target PFC pulse control parameter set, wherein each parameter interval comprises a corresponding relation between a group of current-chopper delay on time and chopper on time;
using the upper boundary current value of each parameter interval and the chopper delay turn-on time corresponding to each parameter interval as interpolation points, and fitting to obtain the first function curve; and fitting by taking the upper boundary current value of each parameter interval and the conduction time of the chopper tube corresponding to each parameter interval as interpolation points to obtain the second function curve.
6. The power factor adaptive control method according to claim 5, wherein controlling the power factor control circuit according to the pulse control parameter includes:
and controlling the chopper tube in the power factor control circuit to be turned on according to the delay turn-on time of the chopper tube, and continuously conducting the turn-on time of the chopper tube.
7. The method according to any one of claims 1-3, wherein determining a plurality of parameter intervals in the target PFC pulse control parameter set comprises:
if the current is in the ascending trend, taking the sum of the current and a preset current return difference as a correction current, and judging a parameter interval according to the correction current;
and if the current is in a descending trend, taking the difference between the current and a preset current return difference as a correction current, and judging a parameter interval according to the correction current.
8. A power factor adaptive control apparatus for an air conditioner, the air conditioner including a power factor control circuit, the apparatus comprising:
the first determining module is used for determining the frequency of the power supply;
a selecting module, configured to select a target PFC pulse control parameter set corresponding to the frequency from a PFC pulse control parameter set according to the frequency, where the PFC pulse control parameter set includes a plurality of PFC pulse control parameter sets corresponding to a plurality of different power supply frequencies;
the acquisition module is used for acquiring the current of the main power supply loop of the power factor control circuit;
the second determining module is used for obtaining pulse control parameters corresponding to the power factor control circuit according to the current and the target PFC pulse control parameter set;
and the control module is used for controlling the power factor control circuit according to the pulse control parameters.
9. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a power factor adaptive control program, which when executed by a processor, implements the power factor adaptive control method according to any of claims 1-7.
10. An air conditioner, comprising:
the power factor adaptive control device according to claim 8; or alternatively, the process may be performed,
a processor;
a memory;
a power factor adaptive control program stored on the memory and executable on the processor, which when executed by the processor implements the power factor adaptive control method of any of claims 1-7.
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| CN202111347136.6A CN114157133B (en) | 2021-11-15 | 2021-11-15 | Power factor self-adaptive control method and device, storage medium and air conditioner |
| JP2022032620A JP7309001B2 (en) | 2021-11-15 | 2022-03-03 | Power factor adaptive control method, power factor correction circuit, and air conditioner |
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| CN114157133A (en) | 2022-03-08 |
| JP7309001B2 (en) | 2023-07-14 |
| JP2023073182A (en) | 2023-05-25 |
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