CN104963846B - Air-conditioner and its supply voltage compressor when falling control method, device - Google Patents
Air-conditioner and its supply voltage compressor when falling control method, device Download PDFInfo
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Abstract
The control method of compressor when falling the invention discloses a kind of supply voltage of air-conditioner, it is comprised the following steps：The input current instantaneous value of real-time detection pfc circuit, and the input current virtual value of pfc circuit is calculated according to input current instantaneous value；When input current virtual value is more than default input current frequency reducing threshold value, the difference between input current virtual value and default input current frequency reducing threshold value is calculated, and the first frequency reducing frequency is generated according to difference；The be added to frequency of compressor of first frequency reducing frequency is given and given with generating the final frequency of compressor；The given generation control signal of final frequency according to compressor carries out vector controlled with by IPM to compressor.The control method can carry out frequency reducing control when the input current of pfc circuit is excessive to compressor, reduce the power output of compressor, so as to reduce the input current of pfc circuit, play a part of to protect input circuit.The invention also discloses the control device and a kind of air-conditioner of compressor in a kind of air-conditioner.
Description
Technical field
The present invention relates to home appliance technical field, compressor when more particularly to a kind of supply voltage of air-conditioner falls
The control device of compressor and a kind of air-conditioner with the control device in control method, a kind of air-conditioner.
Background technology
In the similar systems such as domestic air conditioning, typically first by the single phase alternating current power supply from power network, by uncontrollable full-bridge
Rectification, then boosts by PFC (Power Factor Correction, PFC) circuit, exports dc source,
It is connected to big capacity electrolyte capacitor and load (such as internal system Switching Power Supply, compressor and blower fan etc.).Wherein, based on compressor
Load, in rated output, compressor power output accounts for more than the 90% of total power input.
It is general in air-conditioning system to use Boost type circuit of power factor correction, power factor higher can be not only reached,
And the output galvanic current pressure that can boost, so as to provide galvanic current source to load.Wherein, when input power network electricity
When pressure changes, the outer voltage of pfc circuit can keep DC bus-bar voltage (i.e. electrochemical capacitor voltage) to be basically stable at
Setting amplitude, so as to keep exporting identical bearing power.
But, when grid voltage sags are input into, because bearing power is basically unchanged, cause the input current of pfc circuit
Inevitably enlarge, and the conveyance capacity of input circuit is limited, when the input current of pfc circuit is excessive, can damage input circuit, enters
And there is air-conditioning system failure.
The content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned technology to a certain extent.Therefore, of the invention
One purpose is a kind of control method of compressor when proposing that supply voltage of air-conditioner falls, can be in the defeated of pfc circuit
Enter electric current it is excessive when carry out frequency reducing control to compressor, the power output of compressor is reduced, so as to reduce the input electricity of pfc circuit
Stream, plays a part of to protect input circuit.
It is another object of the present invention to the control device for proposing compressor in a kind of air-conditioner.Also one of the invention
Purpose is to propose a kind of air-conditioner.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposed and compressed when a kind of supply voltage of air-conditioner falls
The control method of machine, wherein, the air-conditioner include pfc circuit, be connected in parallel on the pfc circuit output end electrochemical capacitor and
The compressor that IPM (Intelligent Power Module, SPM) is connected with the IPM, the compressor
Control method is comprised the following steps：S1, the input current instantaneous value of pfc circuit described in real-time detection, and according to the input electricity
Stream instantaneous value calculates the input current virtual value of the pfc circuit；S2, when the input current virtual value is more than default input
During electric current frequency reducing threshold value, the difference between the input current virtual value and the default input current frequency reducing threshold value is calculated,
And the first frequency reducing frequency is generated according to the difference, wherein, the first frequency reducing frequency is less than 0；S3, by first frequency reducing frequently
The be added to given final frequency to generate the compressor of frequency of the compressor of rate gives；And S4, according to the pressure
The given generation control signal of the final frequency of contracting machine carries out vector controlled with by the IPM to the compressor.
The control method of compressor when the supply voltage of air-conditioner according to embodiments of the present invention falls, by real-time detection
The input current instantaneous value of pfc circuit calculates the input current virtual value of pfc circuit, and when input current virtual value is more than pre-
If input current frequency reducing threshold value when calculate difference between input current virtual value and default input current frequency reducing threshold value with
The first frequency reducing frequency is generated, then gives to generate the final frequency of compressor by the be added to frequency of compressor of the first frequency reducing frequency
Rate gives, and the final frequency finally according to compressor gives generation control signal, realizes swearing compressor by controlling IPM
Amount control such that it is able to carry out frequency reducing control to compressor when the input current of pfc circuit is excessive, reduces the output of compressor
Power, so as to reduce the input current of pfc circuit, plays a part of to protect input circuit, it is ensured that air-conditioner is reliablely and stablely transported
OK.
According to one embodiment of present invention, in step sl, the PFC electricity is calculated according to the input current instantaneous value
The input current virtual value on road, specifically includes：The input current instantaneous value is carried out square operation to obtain the first value；Pass through
Low pass filter carries out LPF to obtain second value to first value, wherein, the cut-off frequency of the low pass filter
Much smaller than the frequency of the input current of the pfc circuit；And extracting operation is carried out to the second value to obtain the input
Current effective value.
According to one embodiment of present invention, in step s 2, the first frequency reducing frequency, specific bag are generated according to the difference
Include：Proportional plus integral control is carried out to the difference to obtain the first controlling value；And controlled to described first by the first limiter
Value processed carries out amplitude limiting processing to obtain the first frequency reducing frequency, wherein, the upper limit of first limiter is 0, described first
The lower limit of limiter is the given negative of frequency of the compressor.
According to one embodiment of present invention, step S3 is specifically included：The first frequency reducing frequency is added to the pressure
The frequency of contracting machine gives to obtain first frequency value；And amplitude limiting processing is carried out to the first frequency value by the second limiter
Given with the final frequency for obtaining the compressor, wherein, the upper limit of second limiter allows to run for the compressor
Highest frequency, the lower limit of second limiter is the low-limit frequency of the compressor stable operation.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of control dress of compressor in air-conditioner
Put, wherein, the air-conditioner includes pfc circuit, the electrochemical capacitor of output end that is connected in parallel on the pfc circuit and IPM, described
IPM connected compressor, the control device of the compressor includes：Current detection module, for pfc circuit described in real-time detection
Input current instantaneous value；Computing module, the input current for calculating the pfc circuit according to the input current instantaneous value
Virtual value, and it is effective to calculate the input current when the input current virtual value is more than default input current frequency reducing threshold value
Difference between value and the default input current frequency reducing threshold value；Frequency reducing frequency generation module, for being given birth to according to the difference
Into the first frequency reducing frequency, wherein, the first frequency reducing frequency is less than 0；Frequency gives module, for by the first frequency reducing frequency
The given final frequency to generate the compressor of frequency of the compressor of being added to gives；And control module, for root
Give generation control signal according to the final frequency of the compressor carries out vector controlled with by the IPM to the compressor.
The control device of compressor according to embodiments of the present invention, computing module is according to current detection module real-time detection
The input current instantaneous value of pfc circuit calculates the input current virtual value of pfc circuit, and when input current virtual value is more than pre-
If input current frequency reducing threshold value when calculate difference between input current virtual value and default input current frequency reducing threshold value, drop
Frequency frequency generation module generates the first frequency reducing frequency according to difference, and then be added to the first frequency reducing frequency pressure by the given module of frequency
The given final frequency to generate compressor of the frequency of contracting machine gives, and last control module is given according to the final frequency of compressor
Generation control signal, and realize carrying out vector controlled to compressor by controlling IPM such that it is able in the input electricity of pfc circuit
Frequency reducing control is carried out when flowing through big to compressor, the power output of compressor is reduced, so that reduce the input current of pfc circuit,
Play a part of to protect input circuit, it is ensured that air-conditioner reliablely and stablely runs.
According to one embodiment of present invention, the computing module is specifically included：First arithmetic element, for described defeated
Entering current instantaneous value carries out square operation to obtain the first value；Low pass filter, for carrying out LPF to first value
To obtain second value, wherein, the frequency of the cut-off frequency much smaller than the input current of the pfc circuit of the low pass filter；
Second arithmetic element, for carrying out extracting operation to the second value to obtain the input current virtual value；Mathematic interpolation list
Unit, for calculating the difference between the input current virtual value and the default input current frequency reducing threshold value.
According to one embodiment of present invention, the frequency reducing frequency generation module is specifically included：Proportional and integral controller, uses
In carrying out proportional plus integral control to obtain the first controlling value to the difference；And first limiter, for being controlled to described first
Value processed carries out amplitude limiting processing to obtain the first frequency reducing frequency, wherein, the upper limit of first limiter is 0, described first
The lower limit of limiter is the given negative of frequency of the compressor.
According to one embodiment of present invention, the given module of the frequency is specifically included：Superpositing unit, for by described
One frequency reducing frequency be added to the compressor frequency it is given to obtain first frequency value；And second limiter, for institute
State first frequency value and carry out amplitude limiting processing and given with obtaining the final frequency of the compressor, wherein, second limiter
The upper limit is the highest frequency that the compressor allows operation, and the lower limit of second limiter is the compressor stable operation
Low-limit frequency.
Additionally, embodiments of the invention also proposed a kind of air-conditioner, its control device for including above-mentioned compressor.
The air-conditioner of the embodiment of the present invention, by the control device of above-mentioned compressor, can be in the input of pfc circuit electricity
Frequency reducing control is carried out when flowing through big to compressor, the power output of compressor is reduced, so that reduce the input current of pfc circuit,
Play a part of to protect input circuit, it is ensured that air-conditioner reliablely and stablely runs.
Brief description of the drawings
Fig. 1 is the input circuit schematic diagram of the air-conditioner according to one embodiment of the invention；
Fig. 2 is the flow of the control method of compressor when the supply voltage of the air-conditioner according to the embodiment of the present invention falls
Figure；And
Fig. 3 is the block diagram of the control device of compressor in air-conditioner according to one embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The compressor when supply voltage of the air-conditioner of proposition according to embodiments of the present invention falls described with reference to the accompanying drawings
Control method, air-conditioner in compressor control device and the air-conditioner with the control device.
Fig. 1 is the input circuit schematic diagram of the air-conditioner according to one embodiment of the invention.As shown in figure 1, the air-conditioner
Including the compressor M that pfc circuit, the electrochemical capacitor EC1 of the output end for being connected in parallel on pfc circuit and IPM are connected with the IPM, its
In, single phase AC power is by after rectifier bridge rectification, then electric capacity C filtering output dc source after filtering, supplies pfc circuit, PFC
Circuit includes reactor, diode and power switch pipe.Also, the input current of pfc circuit is detected by resistance sampling method
Instantaneous value, the circuit unit that the input current of pfc circuit is flowed primarily through includes rectifier bridge, reactor, power switch pipe, two poles
Pipe, current sampling resistor etc., current direction is as shown in Figure 1.
With reference to Fig. 1 and Fig. 2, the control method of compressor includes when the supply voltage of the air-conditioner of the embodiment of the present invention falls
Following steps：
S1, the input current instantaneous value of real-time detection pfc circuit, and pfc circuit is calculated according to input current instantaneous value
Input current virtual value.
Wherein, the detection that can realize to the input current of PFC electric currents by current sampling resistor, it is of course also possible to use
Other current detectors such as current transformer etc. detects the input current of PFC electric currents.
According to one embodiment of present invention, in step sl, the PFC electricity is calculated according to the input current instantaneous value
The input current virtual value on road, specifically includes：Input current instantaneous value Iin is carried out square operation to obtain the first value；Pass through
Low pass filter carries out LPF to obtain second value to first value, wherein, the cut-off frequency of the low pass filter
Much smaller than the frequency of the input current of the pfc circuit；And extracting operation is carried out to the second value to obtain the input
Current effective value Irms.Say, input current virtual value Irms can be calculated according to below equation：
Irms=sqrt (LPF (Iin*Iin))
Wherein, sqrt is sqrt computing, and LPF is low pass filter, and its cut-off frequency is far below input current frequency.
In an embodiment of the present invention, pfc circuit can be carried out using carrier frequency high such as 42kHz, each carrier cycle
Monocycle PFC controls, while carrying out input current sampling and current effective value calculating.Because input current frequency is
100Hz, the cut-off frequency of low pass filter may be selected generally below 10Hz, for example, be chosen as 8Hz.
S2, when input current virtual value be more than default input current frequency reducing threshold value when, calculate input current virtual value with
Difference between default input current frequency reducing threshold value, and the first frequency reducing frequency is generated according to the difference, wherein, the first frequency reducing is frequently
Rate is less than 0.
As shown in figure 3, input current virtual value Irms and default input current can be calculated by difference computational unit 204
Difference between frequency reducing threshold value Ith.Wherein, default input current frequency reducing threshold value Ith, in setting, is according to input circuit
Stable state overcurrent capability Irtd is set by drop volume coefficient η %, i.e. Ith is Irtd* η %.Stable state conveyance capacity Irtd is taken as defeated
Enter the minimum value of each component rated current in circuit, each component includes resistance, reactor, the power switch that input current passes through
Pipe, relay, wire and PCB trace etc., and volume coefficient η % drop less than 100%, and it is not less than 80%.For example, according to this hair
A bright example, according to the rated current and power rating requirements of each component in input circuit, the stable state being calculated is excessively electric
Stream ability Irtd can be 20A, and it is 80% to set drop volume coefficient η %, then default input current frequency reducing threshold value Ith is 16A.
According to one embodiment of present invention, in step s 2, the first frequency reducing frequency, specific bag are generated according to the difference
Include：Difference (Ith-Irms) is carried out proportional plus integral control to obtain the first controlling value；And by the first limiter to first
Controlling value carries out amplitude limiting processing to obtain the first frequency reducing frequency FreqReduce, wherein, the upper limit of the first limiter is 0, first
The lower limit of limiter is the given negative of the frequency of compressor, i.e.-FreqSetPre.
That is, to default input current frequency reducing threshold value and the difference (Ith-Irms) of input current virtual value, adopting
Automatically adjusted with proportional and integral controller, then export the first frequency reducing frequency by the first limiter amplitude limit
FreqReduce。
S3, the be added to frequency of compressor of the first frequency reducing frequency is given and is given with generating the final frequency of compressor.
According to one embodiment of present invention, step S3 is specifically included：First frequency reducing frequency FreqReduce is added to
The frequency of compressor gives FreqSetPre to obtain first frequency value；And first frequency value is carried out by the second limiter
Amplitude limiting processing gives FreqSetFinal to obtain the final frequency of compressor, wherein, the upper limit of the second limiter is compressor
The highest frequency FreqMax of operation is allowed, the lower limit of the second limiter is the low-limit frequency FreqMin of compressor stable operation.
That is, to compressor operating frequency frequency reducing, will the given FreqSetPre of frequency of compressor dropped with first
Frequent rate FreqReduce is added, and then carries out amplitude limit by the second limiter and be output as the final frequency of compressor operating to give
FreqSetFinal。
S4, the given generation control signal of final frequency according to compressor carries out vector controlled with by IPM to compressor.
Say, FreqSetFinal can be input into control module, control module is FOC using ensorless control algorithm
(Field Orientated Control, Field orientable control) algorithm realizes the vector controlled to compressor, so as to be closed
Ring adjusts compressor rotary speed.
In an embodiment of the present invention, when input current virtual value is higher than input current frequency reducing threshold value, pfc circuit is represented
Input current it is excessive, then, the difference of input current virtual value and input current frequency reducing threshold value is by after proportional integral regulation
Amplitude limiting processing is carried out, the first frequency reducing frequency FreqReduce of negative is obtained, and the frequency of the compressor that is added to gives
On FreqSetPre, so as to reduce compressor operating frequency；It is defeated when input current virtual value is less than input current frequency reducing threshold value
Enter the difference of current effective value and input current frequency reducing threshold value by after proportional integral regulation, the first frequency reducing frequency FreqReduce
0 is gradually increasing by negative and be limited in, so as to exit compressor frequency reducing working condition, compression under normal circumstances is had no effect on
Machine operation characteristic.
The control method of compressor when the supply voltage of air-conditioner according to embodiments of the present invention falls, by real-time detection
The input current instantaneous value of pfc circuit calculates the input current virtual value of pfc circuit, and when input current virtual value is more than pre-
If input current frequency reducing threshold value when calculate difference between input current virtual value and default input current frequency reducing threshold value with
The first frequency reducing frequency is generated, then gives to generate the final frequency of compressor by the be added to frequency of compressor of the first frequency reducing frequency
Rate gives, and the final frequency finally according to compressor gives generation control signal, realizes swearing compressor by controlling IPM
Amount control such that it is able to carry out frequency reducing control to compressor when the input current of pfc circuit is excessive, reduces the output of compressor
Power, so as to reduce the input current of pfc circuit, plays a part of to protect input circuit, it is ensured that air-conditioner is reliablely and stablely transported
OK.
With reference to shown in Fig. 1 and Fig. 3, the control device of compressor includes in the air-conditioner of the embodiment of the present invention：Current detecting
Module 10, computing module 20, frequency reducing frequency generation module 30, frequency give module 40 and control module 50.
Wherein, current detection module 10 is used for the input current instantaneous value Iin of pfc circuit described in real-time detection, for example may be used
Detection to the input current of pfc circuit is realized by current sampling resistor.Computing module 20 is used for instantaneous according to input current
Value Iin calculates the input current virtual value Irms of pfc circuit, and is more than default input current in input current virtual value Irms
Difference (the Ith- between input current virtual value and the default input current frequency reducing threshold value is calculated during frequency reducing threshold value Ith
Irms)。
As shown in figure 3, computing module 20 is specifically included：First arithmetic element 201, low pass filter LPF, the second computing list
Unit 203 and difference computational unit 204.Wherein, the first arithmetic element 201 is used to carry out the input current instantaneous value a square fortune
Calculate to obtain the first value；Low pass filter LPF is used to carry out LPF to obtain second value to first value, wherein, institute
State the frequency of the cut-off frequency much smaller than the input current of the pfc circuit of low pass filter；It is right that second arithmetic element 203 is used for
The second value carries out extracting operation to obtain the input current virtual value；Difference computational unit 204 is used to calculate described defeated
Enter the difference (Ith-Irms) between current effective value and the default input current frequency reducing threshold value.
In an embodiment of the present invention, frequency reducing frequency generation module 30 is used to generate the first frequency reducing frequency according to the difference
FreqReduce, wherein, the first frequency reducing frequency FreqReduce is less than 0.
As shown in figure 3, frequency reducing frequency generation module 30 is specifically included：The limiter of proportional and integral controller 301 and first
302.Proportional and integral controller 301 is used to that the difference (Ith-Irms) to be carried out proportional plus integral control to obtain the first control
Value；First limiter 302 is used to that first controlling value to be carried out amplitude limiting processing to obtain the first frequency reducing frequency
FreqReduce, wherein, the upper limit of the first limiter 302 is 0, and the lower limit of the first limiter 302 is the frequency of the compressor
Given negative, i.e.-FreqSetPre.
In an embodiment of the present invention, the given module 40 of frequency is used for the first frequency reducing frequency FreqReduce superpositions
Frequency to compressor gives FreqSetPre to generate the given FreqSetFinal of the final frequency of the compressor.Control mould
Block 50 be used for according to the given FreqSetFinal generation control signals of the final frequency of the compressor with by the IPM to institute
Stating compressor carries out vector controlled, that is, say, control module 50 can be FOC (Field using ensorless control algorithm
Orientated Control, Field orientable control) algorithm realized to the vector controlled of compressor, so as to carry out closed loop regulation pressure
Contracting machine rotating speed.
As shown in figure 3, the given module 40 of frequency is specifically included：The limiter 402 of superpositing unit 401 and second.Wherein, it is superimposed
Unit 401 is used to give to obtain first frequency value by the be added to frequency of the compressor of the first frequency reducing frequency；Second
Limiter 402 is given for carrying out amplitude limiting processing to the first frequency value with obtaining the final frequency of the compressor
FreqSetFinal, wherein, the upper limit of the second limiter 402 allows the highest frequency FreqMax of operation, the second limit for compressor
The lower limit of width device 402 is low-limit frequency FreqMin of the compressor without stable operation under sensor closed-loop control.
The control device of compressor according to embodiments of the present invention, computing module is according to current detection module real-time detection
The input current instantaneous value of pfc circuit calculates the input current virtual value of pfc circuit, and when input current virtual value is more than pre-
If input current frequency reducing threshold value when calculate difference between input current virtual value and default input current frequency reducing threshold value, drop
Frequency frequency generation module generates the first frequency reducing frequency according to difference, and then be added to the first frequency reducing frequency pressure by the given module of frequency
The given final frequency to generate compressor of the frequency of contracting machine gives, and last control module is given according to the final frequency of compressor
Generation control signal, and realize carrying out vector controlled to compressor by controlling IPM such that it is able in the input electricity of pfc circuit
Frequency reducing control is carried out when flowing through big to compressor, the power output of compressor is reduced, so that reduce the input current of pfc circuit,
Play a part of to protect input circuit, it is ensured that air-conditioner reliablely and stablely runs.
Additionally, embodiments of the invention also proposed a kind of air-conditioner, its control device for including above-mentioned compressor.
The air-conditioner of the embodiment of the present invention, by the control device of above-mentioned compressor, can be in the input of pfc circuit electricity
Frequency reducing control is carried out when flowing through big to compressor, the power output of compressor is reduced, so that reduce the input current of pfc circuit,
Play a part of to protect input circuit, it is ensured that air-conditioner reliablely and stablely runs.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, must rather than the device or element for indicating or imply meaning
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " is meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or two interaction relationships of element, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combined in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (7)
1. the control method of compressor when a kind of supply voltage of air-conditioner falls, it is characterised in that the air-conditioner includes PFC
Circuit, be connected in parallel on the pfc circuit output end electrochemical capacitor and the compressors that are connected with the IPM of IPM, the compression
The control method of machine is comprised the following steps：
S1, the input current instantaneous value of pfc circuit described in real-time detection, and according to the input current instantaneous value is calculated
The input current virtual value of pfc circuit；
S2, when the input current virtual value is more than default input current frequency reducing threshold value, calculates the input current effective
Difference between value and the default input current frequency reducing threshold value, and carry out proportional plus integral control to the difference to obtain the
One controlling value, and first controlling value is carried out amplitude limiting processing to obtain first frequency reducing frequently by the first limiter
Rate, wherein, the upper limit of first limiter is 0, and the lower limit of first limiter is that the frequency of the compressor is given
Negative, the first frequency reducing frequency is less than 0；
S3, the be added to frequency of the compressor of the first frequency reducing frequency is given to generate the final frequency of the compressor
It is given；And
S4, the given generation control signal of final frequency according to the compressor is carried out with by the IPM to the compressor
Vector controlled.
2. control method as claimed in claim 1, it is characterised in that in step sl, according to the input current instantaneous value
The input current virtual value of the pfc circuit is calculated, is specifically included：
The input current instantaneous value is carried out square operation to obtain the first value；
LPF is carried out to obtain second value to first value by low pass filter, wherein, the low pass filter
Frequency of the cut-off frequency much smaller than the input current of the pfc circuit；And
Extracting operation is carried out to the second value to obtain the input current virtual value.
3. control method as claimed in claim 1, it is characterised in that step S3 is specifically included：
The be added to frequency of the compressor of the first frequency reducing frequency is given to obtain first frequency value；And
Amplitude limiting processing is carried out by the second limiter to the first frequency value to be given to obtain the final frequency of the compressor,
Wherein, the upper limit of second limiter is the highest frequency that the compressor allows operation, the lower limit of second limiter
It is the low-limit frequency of the compressor stable operation.
4. in a kind of air-conditioner compressor control device, it is characterised in that the air-conditioner include pfc circuit, be connected in parallel on institute
State the compressor that the electrochemical capacitor of the output end of pfc circuit is connected with IPM, the IPM, the control device bag of the compressor
Include：
Current detection module, for the input current instantaneous value of pfc circuit described in real-time detection；
Computing module, the input current virtual value for calculating the pfc circuit according to the input current instantaneous value, and in institute
The input current virtual value is calculated when stating input current virtual value more than default input current frequency reducing threshold value default with described
Input current frequency reducing threshold value between difference；
Frequency reducing frequency generation module, the frequency reducing frequency generation module includes：
Proportional and integral controller, for carrying out proportional plus integral control to obtain the first controlling value to the difference；
First limiter, for carrying out amplitude limiting processing to obtain the first frequency reducing frequency to first controlling value, wherein, institute
It is 0 to state the upper limit of the first limiter, and the lower limit of first limiter is the given negative of frequency of the compressor, described the
One frequency reducing frequency is less than 0；
Frequency gives module, for giving to generate the pressure the be added to frequency of the compressor of the first frequency reducing frequency
The final frequency of contracting machine gives；And
Control module, for according to the given generation control signal of the final frequency of the compressor with by the IPM to described
Compressor carries out vector controlled.
5. control device as claimed in claim 4, it is characterised in that the computing module is specifically included：
First arithmetic element, for carrying out square operation to obtain the first value to the input current instantaneous value；
Low pass filter, for carrying out LPF to obtain second value to first value, wherein, the low pass filter
Frequency of the cut-off frequency much smaller than the input current of the pfc circuit；
Second arithmetic element, for carrying out extracting operation to the second value to obtain the input current virtual value；
Difference computational unit, for calculating between the input current virtual value and the default input current frequency reducing threshold value
Difference.
6. control device as claimed in claim 4, it is characterised in that the given module of the frequency is specifically included：
Superpositing unit, for giving to obtain first frequency the be added to frequency of the compressor of the first frequency reducing frequency
Value；And
Second limiter, for amplitude limiting processing is carried out to the first frequency value with obtain the final frequency of the compressor to
It is fixed, wherein, the upper limit of second limiter is the highest frequency that the compressor allows operation, under second limiter
It is limited to the low-limit frequency of the compressor stable operation.
7. a kind of air-conditioner, it is characterised in that including the control device as any one of claim 4-6.
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| CN105932871B (en) * | 2016-05-27 | 2018-11-27 | 广东美的制冷设备有限公司 | The control method of compressor, device and air conditioner in air conditioner |
| CN106918121A (en) * | 2017-03-31 | 2017-07-04 | 广东美的制冷设备有限公司 | Air-conditioner and its control method and device |
| CN108895634B (en) * | 2018-07-26 | 2020-07-03 | 奥克斯空调股份有限公司 | Compressor control method and device |
| CN111219847A (en) * | 2019-12-06 | 2020-06-02 | 宁波奥克斯电气股份有限公司 | Method and device for avoiding abnormal shutdown of air conditioner due to sudden change of voltage and air conditioner |
| CN113375285B (en) * | 2021-06-17 | 2022-04-08 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device and air conditioner |
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| JPH1114124A (en) * | 1997-06-20 | 1999-01-22 | Sharp Corp | Air conditioner |
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| TWI331202B (en) * | 2007-03-13 | 2010-10-01 | Nat Univ Chin Yi Technology | A minimum input power control mehtod and system for air-conditioners |
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