CN105099322B - The electric current limit frequency method and device of convertible frequency air-conditioner - Google Patents
The electric current limit frequency method and device of convertible frequency air-conditioner Download PDFInfo
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Abstract
The invention discloses a kind of electric current of convertible frequency air-conditioner to limit frequency method and device, convertible frequency air-conditioner includes rectification circuit, Active PFC pfc circuit and compressor, the input of pfc circuit is connected with the output end of rectification circuit, and the output end of pfc circuit is connected with compressor, and method comprises the following steps：Obtain the input current virtual value Iin_rms of convertible frequency air-conditioner；Input current virtual value Iin_rms is subtracted into default electric current limit frequency threshold value to obtain the current differential between input current virtual value Iin_rms and electric current limit frequency threshold value, and current differential is judged；If current differential is more than or equal to first threshold, control compressor is out of service；If current differential is more than or equal to Second Threshold and is less than first threshold, then control compressor is run according to default step-length frequency reducing, wherein, Second Threshold is less than first threshold, so as to by controlling the running frequency of compressor to reduce power output, and then reduce the purpose of input current, improve the heat condition of input circuit, avoid that over current fault occurs.
Description
Technical field
The present invention relates to air-conditioning technical field, the electric current limit frequency method of more particularly to a kind of convertible frequency air-conditioner and a kind of frequency conversion
The electric current limit frequency device of air-conditioning.
Background technology
In single phase alternating current power supply input system such as domestic air conditioning, the single phase alternating current power supply from power network generally first passes through
Uncontrollable full bridge rectifier, then by circuit of power factor correction, then export direct current and be connected to big capacity electrolyte capacitor,
Load is finally provided to such as internal switch power supply, compressor and blower fan.
In the related art, as the rise of compressor operating frequency, input current increase therewith, so that input electricity
Device heating in road is serious, it is also possible to causes over current fault to enter, causes device failure.Therefore, correlation technique needs to be changed
Enter.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of electric current limit frequency method of convertible frequency air-conditioner, and this method can be by improving the heating shape of input circuit
Condition.
It is another object of the present invention to the electric current for proposing a kind of convertible frequency air-conditioner to limit frequency device.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of electric current limit frequency method of convertible frequency air-conditioner, institute
Stating convertible frequency air-conditioner includes rectification circuit, Active PFC pfc circuit and compressor, the input of the pfc circuit with it is described
The output end of rectification circuit is connected, and the output end of the pfc circuit is connected with the compressor, and methods described includes following step
Suddenly：Obtain the input current virtual value Iin_rms of the convertible frequency air-conditioner；The input current virtual value Iin_rms is subtracted pre-
If electric current limit frequency threshold value with obtain the input current virtual value Iin_rms and the electric current limit frequency threshold value between difference between current
Value, and the current differential is judged；If the current differential is more than or equal to first threshold, the compressor is controlled
It is out of service；If the current differential is more than or equal to Second Threshold and is less than the first threshold, the compressor is controlled
Run according to default step-length frequency reducing, wherein, the Second Threshold is less than the first threshold.
The electric current limit frequency method of the convertible frequency air-conditioner proposed according to embodiments of the present invention, obtains input current virtual value Iin_
Current differential between rms and electric current limit frequency threshold value, and current differential is judged, if current differential is more than or equal to first
Threshold value, then control compressor out of service；If current differential is more than or equal to Second Threshold and is less than first threshold, control pressure
Contracting machine is run according to default step-length frequency reducing, so as to by controlling the running frequency of compressor to reduce power output, and then subtract
The purpose of small input current, improve the heat condition of input circuit, avoid that over current fault occurs, improve system reliability.
According to some embodiments of the present invention, the electric current limit frequency method of described convertible frequency air-conditioner also includes：If the electricity
Stream difference is more than or equal to the 3rd threshold value and is less than the Second Threshold, then controls the compressor to keep current operation frequency fortune
OK.
According to some embodiments of the present invention, the electric current limit frequency method of described convertible frequency air-conditioner also includes：If the electricity
Stream difference is less than the 3rd threshold value, then is obtained according to the operational mode of the convertible frequency air-conditioner, target temperature and indoor environment temperature
Demand frequency is taken, and the compressor is controlled according to the demand frequency.
Further, according to some embodiments of the present invention, the compressor is controlled according to the demand frequency,
Specifically include：If the frequency-splitting between the demand frequency and the current operation frequency of the compressor is more than described default
Step-length, then the compressor is controlled to be run according to the default step-length raising frequency；If the current operation frequency of the compressor with
Frequency-splitting between the demand frequency is more than the default step-length, then controls the compressor to be dropped according to the default step-length
Frequency is run；If the absolute value of the frequency-splitting between the demand frequency and the current operation frequency of the compressor be less than etc.
In the default step-length, then the compressor is controlled to be run with the demand frequency.
According to some embodiments of the present invention, the input current virtual value Iin_rms of convertible frequency air-conditioner is obtained, is specifically included：
The input current instantaneous value Iin of the pfc circuit is detected, to obtain the input electricity according to the input current instantaneous value Iin
Flow virtual value Iin_rms.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of electric current limit frequency device of convertible frequency air-conditioner,
The convertible frequency air-conditioner includes rectification circuit, Active PFC pfc circuit and compressor, the input of the pfc circuit and institute
The output end for stating rectification circuit is connected, and the output end of the pfc circuit is connected with the compressor, and described device includes：Electric current
Acquiring unit, for obtaining the input current virtual value Iin_rms of the convertible frequency air-conditioner；Control unit, for by the input
Current effective value Iin_rms subtract default electric current limit frequency threshold value with obtain the input current virtual value Iin_rms with it is described
Current differential between electric current limit frequency threshold value, and the current differential is judged, if the current differential is more than or equal to
First threshold, then control the compressor out of service, if the current differential is more than or equal to Second Threshold and less than described
First threshold, then the compressor is controlled to be run according to default step-length frequency reducing, wherein, the Second Threshold is less than first threshold
Value.
The electric current limit frequency device of the convertible frequency air-conditioner proposed according to embodiments of the present invention, input current is obtained by control unit
Current differential between virtual value Iin_rms and electric current limit frequency threshold value, and current differential is judged, if current differential is big
In equal to first threshold, then control compressor out of service；If current differential is more than or equal to Second Threshold and is less than the first threshold
Value, then compressor is controlled to be run according to default step-length frequency reducing, so as to by controlling the running frequency of compressor to reduce output work
Rate, and then reduce the purpose of input current, improve the heat condition of input circuit, avoid that over current fault occurs, improve system
System reliability.
According to some embodiments of the present invention, if the current differential is more than or equal to the 3rd threshold value and less than described second
Threshold value, described control unit then control the compressor to keep current operation frequency operation.
According to some embodiments of the present invention, if the current differential is less than the 3rd threshold value, described control unit
Demand frequency is then obtained according to the operational mode of the convertible frequency air-conditioner, target temperature and indoor environment temperature, and according to the need
Frequency is asked to be controlled the compressor.
Further, according to some embodiments of the present invention, if the demand frequency and the current fortune of the compressor
Frequency-splitting between line frequency is more than the default step-length, and described control unit then controls the compressor according to described default
Step-length raising frequency is run；If the frequency-splitting between the current operation frequency of the compressor and the demand frequency is more than described
Default step-length, described control unit then control the compressor to be run according to the default step-length frequency reducing；If the demand frequency
The absolute value of frequency-splitting between the current operation frequency of rate and the compressor is less than or equal to the default step-length, the control
Unit processed then controls the compressor to be run with the demand frequency.
According to some embodiments of the present invention, the electric current acquiring unit specifically includes：Current detector, for detecting
State the input current instantaneous value Iin of pfc circuit；Current calculator, described in being calculated according to the input current instantaneous value Iin
Input current virtual value Iin_rms.
Brief description of the drawings
Fig. 1 is the electric current limit frequency of the input voltage adapting of PFC pfc circuit according to embodiments of the present invention
The flow chart of method；
Fig. 2 is the schematic diagram of PFC pfc circuit according to embodiments of the present invention；And
Fig. 3 is the electric current limit frequency of the input voltage adapting of PFC pfc circuit according to embodiments of the present invention
The block diagram of device.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings frequency method and device are limited to describe the electric current of the convertible frequency air-conditioner of proposition of the embodiment of the present invention.Its
In, single phase alternating current power supply is input to Active PFC PFC (Power Factor after rectifier circuit rectifies
Correction, PFC) circuit.
According to Fig. 2-3 example, convertible frequency air-conditioner may include rectification circuit 10, PFC (Power Factor Correction,
PFC) circuit 20 and compressor 30.Wherein, the input of rectification circuit 10 is connected with single phase alternating current power supply AC, whole
Current circuit 10 is used to the single-phase alternating current that single phase alternating current power supply AC is provided carrying out rectification to obtain the direct current after rectification；PFC
The input of circuit 20 is connected with the output end of rectification circuit, and the output end of pfc circuit 20 is connected with compressor 30, pfc circuit
20 are used to carry out PFC to power supply.In addition, can also electricity in parallel between the output end of pfc circuit 20 and compressor 30
Solve electric capacity E1.
That is, single phase alternating current power supply AC passes through the uncontrollable full-wave rectification of rectification circuit 10, then by pfc circuit
20, output is connected to the electrochemical capacitor E1 of Large Copacity, and then is powered to compressor 30.Wherein, rectification circuit 10 and pfc circuit 20 are made
For the input circuit of electric supply installation in convertible frequency air-conditioner, the main rectification circuit 10 of input current and the grade device of pfc circuit 20, electric current stream
To as shown in arrow in short dash line in Fig. 2.
It should be noted that pfc circuit 20 can use the pfc circuit with boost function, can also use without boosting
The pfc circuit of function.When using the pfc circuit with boost function, pfc circuit 20 is carrying out PFC to power supply
While can also carry out boosting processing to the direct current after rectification, to provide stable direct current for electrochemical capacitor E1 and compressor 30
Voltage, now, pfc circuit 20 are preferably Boost type pfc circuit, and it may include the first inductance, power switch pipe and the one or two pole
Pipe.When using the pfc circuit for not having boost function, pfc circuit 20 only carries out PFC to power supply, without to whole
Direct current after stream carries out boosting processing, and now, the pfc circuit without boost function may include the second inductance, the first electric capacity
With the second diode.
With reference to Fig. 2 embodiment, the embodiment of the present invention proposes a kind of electric current limit frequency method of convertible frequency air-conditioner.
Fig. 1 is the flow chart of the electric current limit frequency method of convertible frequency air-conditioner according to embodiments of the present invention.Convertible frequency air-conditioner includes whole
Current circuit, Active PFC pfc circuit and compressor, the input of pfc circuit are connected with the output end of rectification circuit, PFC
The output end of circuit is connected with compressor.As shown in figure 1, the electric current limit frequency method of convertible frequency air-conditioner comprises the following steps：
S1：Obtain the input current virtual value Iin_rms of convertible frequency air-conditioner.
According to one embodiment of present invention, the input current virtual value Iin_rms for obtaining convertible frequency air-conditioner is specifically included：Inspection
The input current instantaneous value Iin of pfc circuit is surveyed, to obtain input current virtual value Iin_ according to input current instantaneous value Iin
rms。
That is, the electric current after rectification is can detect to obtain input current DC side instantaneous value Iin, and can be according to following
Formula calculates input current virtual value Iin_rms：
Iin_rms=sqrt (2) * Π/4*Iin_mean ≈ 1.11*Iin_mean,
Wherein, Iin_mean is input current average value, and Iin_mean=MEAN (Iin), wherein MEAN represent average value
Calculate.
In addition, according to the specific example of the present invention, input current instantaneous value Iin can be detected by resistance sampling method.
S2：Input current virtual value Iin_rms is subtracted into default electric current limit frequency threshold value to obtain input current virtual value
Current differential between Iin_rms and electric current limit frequency threshold value, and current differential is judged.
Wherein, electric current limit frequency threshold value Iin_thr can be input circuit in a rated operation can longtime running most
Big input current.For example, for the input circuit that rated current is 15A, electric current limit frequency threshold value Iin_thr (virtual value) can
It is taken as 10A.
S3：If current differential is more than or equal to first threshold, control compressor is out of service.
Wherein, first threshold is current protection buffer value, for example, the input circuit for rated current for 15A, the
One threshold value diff1 is preferably 1A.
S4：If current differential is more than or equal to Second Threshold and is less than first threshold, control compressor is according to default step
Long frequency reducing operation, wherein, Second Threshold is less than first threshold, and Second Threshold is preferably 0.
That is, input current instantaneous value Iin can be detected in real time, and calculated and inputted according to input current instantaneous value Iin
Current effective value Iin_rms, and frequency threshold value Iin_thr is limited to compressor according to input current virtual value Iin_rms and electric current
Running frequency carry out electric current limit frequency control.
Specifically, frequency threshold value Iin_thr is limited to input current virtual value Iin_rms and electric current in each controlling cycle
Between current differential Iin_rms-Iin_thr once judged, when current differential Iin_rms-Iin_thr is more than or equal to the
During one threshold value diff1, i.e., as Iin_rms >=(Iin_thr+diff1), judge that input current virtual value Iin_rms is in and stop
Machine guard interval, now carries out stoppage protection to convertible frequency air-conditioner, and subsequent time running frequency is arranged to zero；As current differential Iin_
When rms-Iin_thr is more than or equal to Second Threshold diff2 such as 0 and is less than first threshold diff1, i.e., as Iin_thr≤Iin_
rms<(Iin_thr+diff1) when, judge that input current virtual value Iin_rms is in limit frequency section, now can be by default step-length
It is compressed machine frequency reducing operation, i.e. subsequent time running frequency=current operation frequency-default step-length.
According to the specific example of the present invention, the controlling cycle of electric current limit frequency method is preferably 10ms, presets step-length
It is preferably 0.01Hz, i.e., the running frequency maximum of every 1 second compressor can reduce 1Hz.
Further, according to one embodiment of present invention, the electric current limit frequency method of the embodiment of the present invention also includes：If
Current differential is more than or equal to the 3rd threshold value and is less than Second Threshold, then controls compressor to keep current operation frequency operation.Wherein,
3rd threshold value is less than Second Threshold, and the 3rd threshold value is that electric current limits frequency retention value, the input circuit for rated current for 15A, the
Three threshold value diff3 are preferably -1.5A.
That is, in each controlling cycle, when current differential Iin_rms-Iin_thr is more than or equal to the 3rd threshold value
Diff3 and when being less than Second Threshold diff2, i.e., as (Iin_thr+diff3)≤Iin_rms<During Iin_thr, input electricity is judged
Flow virtual value Iin_rms and be in holding section, now current operation frequency is kept constant.
Further, according to one embodiment of present invention, it is empty according to frequency conversion if current differential is less than the 3rd threshold value
Operational mode, target temperature and the indoor environment temperature of tune obtain demand frequency, and frequency is controlled to compressor according to demand
System.
Specifically, frequency is controlled to compressor according to demand, is specifically included：If demand frequency and compressor are worked as
Frequency-splitting between preceding running frequency is more than default step-length, then controls compressor to be run according to default step-length raising frequency；If pressure
Frequency-splitting between the current operation frequency and demand frequency of contracting machine is more than default step-length, then controls compressor according to default step
Long frequency reducing operation；If the absolute value of the frequency-splitting between demand frequency and the current operation frequency of compressor is less than or equal to pre-
If step-length, then compressor is controlled to be run with demand frequency.
That is, in each controlling cycle, when current differential Iin_rms-Iin_thr is less than the 3rd threshold value diff3,
Work as Iin_rms<(Iin_thr+diff3) when, judge that input current virtual value Iin_rms is in normal interval, now by pre-
If step-length is compressed unit frequency control on the basis of demand frequency, i.e., if current operation frequency<(demand frequency-default
Step-length), then running frequency=current operation frequency of subsequent time gives+frequency reducing step-length；If current operation frequency>(demand
Frequency+default step-length), then running frequency=current operation frequency of subsequent time gives-frequency reducing step-length；Otherwise, subsequent time
Running frequency=demand frequency.
The electric current of embodiment of the present invention limit frequency method is described in detail with reference to a preferred embodiment.
Assuming that the frequency for being input to the alternating current of rectification circuit 10 is 50Hz, i.e., the input of pfc circuit is input to after rectification
Current cycle is 10ms, and input current is detected by sampling resistor, sample frequency 42kHz's, i.e. input current instantaneous value Iin
Renewal frequency is 42kHz.
So, in each input current cycle, the sliding window size that input current average value calculates is 420, input
Current average Iin_mean is the average value of 420 current instantaneous values, according to input current average value Iin_mean
Calculate input current virtual value Iin_rms, i.e. Iin_rms=sqrt (2) * Π/4*Iin_mean ≈ 1.11*Iin_mean.
After input current virtual value Iin_rms is calculated, you can limit frequency threshold value according to input current virtual value Iin_rms and electric current
Iin_thr carries out electric current limit frequency to the running frequency of compressor and controlled.
In summary, the electric current limit frequency method of the convertible frequency air-conditioner proposed according to embodiments of the present invention, obtaining input current has
Current differential between valid value Iin_rms and electric current limit frequency threshold value, and current differential is judged, if current differential is more than
Equal to first threshold, then control compressor out of service；If current differential is more than or equal to Second Threshold and is less than first threshold,
Then control compressor is run according to default step-length frequency reducing, so as to by controlling the running frequency of compressor to reduce power output, enter
And reach the purpose for reducing input current, improve the heat condition of input circuit, avoid that over current fault occurs, it is reliable to improve system
Property.
In order to perform above-described embodiment, another aspect of the present invention embodiment also proposed a kind of electric current limit frequency of convertible frequency air-conditioner
Device.
Fig. 3 is the block diagram of the electric current limit frequency device of convertible frequency air-conditioner according to embodiments of the present invention.As shown in figure 3,
Convertible frequency air-conditioner includes rectification circuit 10, Active PFC pfc circuit 20 and compressor 30, the input of pfc circuit 20 with it is whole
The output end of current circuit 10 is connected, and the output end of pfc circuit 20 is connected with compressor 30, and electric current limit frequency device 100 includes：Electric current
Acquiring unit 101 and control unit 102.
Wherein, electric current acquiring unit 101 is used for the input current virtual value Iin_rms for obtaining convertible frequency air-conditioner.According to this hair
Bright one embodiment, electric current acquiring unit 101 specifically include：Current detector 11 and current calculator 12, current detector
The 11 input current instantaneous value Iin for detecting pfc circuit 20；Current calculator 12 is used for according to input current instantaneous value Iin
Calculate input current virtual value Iin_rms.According to the specific example of the present invention, current detector 11 can pass through resistance sampling
Method detection input current instantaneous value Iin.
That is, current detector 11 can detect the electric current after rectification to obtain input current DC side instantaneous value Iin,
And current calculator 12 can calculate input current virtual value Iin_rms according to below equation：
Iin_rms=sqrt (2) * Π/4*Iin_mean ≈ 1.11*Iin_mean,
Wherein, Iin_mean is input current average value, and Iin_mean=MEAN (Iin), wherein MEAN represent average value
Calculate.
Control unit 102 is defeated to obtain for input current virtual value Iin_rms to be subtracted into default electric current limit frequency threshold value
Enter the current differential between current effective value Iin_rms and electric current limit frequency threshold value, and current differential is judged, if electric current
Difference is more than or equal to first threshold, then controls compressor 30 out of service, if current differential is more than or equal to Second Threshold and small
In first threshold, then compressor 30 is controlled to be run according to default step-length frequency reducing, wherein, Second Threshold is less than first threshold.
That is, current detector 11 can detect input current instantaneous value Iin in real time, current calculator 12 can be according to defeated
Enter current instantaneous value Iin and calculate input current virtual value Iin_rms, then, control unit 102 is according to input current virtual value
Iin_rms and electric current limit frequency threshold value Iin_thr carries out electric current limit frequency to the running frequency of compressor 30 and controlled.
It should be noted that electric current limit frequency threshold value Iin_thr can be that input circuit in a rated operation can be long-term
The maximum input current of operation, Second Threshold are preferably 0.For example, for the input circuit that rated current is 15A, electricity
Ductility limit frequency threshold value Iin_thr (virtual value) can be taken as 10A, and first threshold diff1 is preferably 1A.
Specifically, input current virtual value Iin_rms and electric current are limited in each controlling cycle, control unit 102
Current differential Iin_rms-Iin_thr between frequency threshold value Iin_thr is once judged, as current differential Iin_rms-Iin_
When thr is more than or equal to first threshold diff1, i.e., as Iin_rms >=(Iin_thr+diff1), control unit 102 judges input
Current effective value Iin_rms is in stoppage protection section, now carries out stoppage protection, subsequent time running frequency to convertible frequency air-conditioner
It is arranged to zero；When current differential Iin_rms-Iin_thr is more than or equal to Second Threshold diff2 such as 0 and is less than first threshold
During diff1, i.e., as Iin_thr≤Iin_rms<(Iin_thr+diff1) when, control unit 102 judges input current virtual value
Iin_rms is in limit frequency section, can now be compressed machine frequency reducing operation by default step-length, i.e., subsequent time running frequency=when
Preceding running frequency-default step-length.
Further, according to one embodiment of present invention, if current differential is more than or equal to the 3rd threshold value and less than the
Two threshold values, control unit 102 then control compressor 30 to keep current operation frequency operation.
That is, in each controlling cycle, when current differential Iin_rms-Iin_thr is more than or equal to the 3rd threshold value
Diff3 and when being less than Second Threshold diff2, i.e., as (Iin_thr+diff3)≤Iin_rms<During Iin_thr, control unit 102
Judge that input current virtual value Iin_rms is in and keep section, now current operation frequency is kept constant.
Further, according to one embodiment of present invention, if current differential is less than the 3rd threshold value, control unit 102
Demand frequency, and frequency pair according to demand are then obtained according to the operational mode of convertible frequency air-conditioner, target temperature and indoor environment temperature
Compressor 30 is controlled.
Wherein, if the frequency-splitting between demand frequency and the current operation frequency of compressor is more than default step-length, control
Unit 102 processed then controls compressor 30 to be run according to default step-length raising frequency；If the current operation frequency of compressor and demand frequency
Frequency-splitting between rate is more than default step-length, and control unit 102 then controls compressor 30 to be run according to default step-length frequency reducing；Such as
The absolute value of frequency-splitting between fruit demand frequency and the current operation frequency of compressor is less than or equal to default step-length, and control is single
Member 102 then controls compressor 30 to be run with demand frequency.
That is, in each controlling cycle, when current differential Iin_rms-Iin_thr is less than the 3rd threshold value diff3,
Work as Iin_rms<(Iin_thr+diff3) when, control unit 102 judges that input current virtual value Iin_rms is in normal area
Between, unit frequency control is now compressed on the basis of demand frequency by default step-length, i.e., if current operation frequency<(need
Seek frequency-default step-length), then running frequency=current operation frequency of subsequent time gives+frequency reducing step-length；If current operation
Frequency>(demand frequency+default step-length), then running frequency=current operation frequency of subsequent time gives-frequency reducing step-length；It is no
Then, the running frequency of subsequent time=demand frequency.
In summary, the electric current limit frequency device of the convertible frequency air-conditioner proposed according to embodiments of the present invention, is obtained by control unit
The current differential between input current virtual value Iin_rms and electric current limit frequency threshold value is taken, and current differential is judged, if
Current differential is more than or equal to first threshold, then controls compressor out of service；If current differential be more than or equal to Second Threshold and
Less than first threshold, then compressor is controlled to be run according to default step-length frequency reducing, so as to by controlling the running frequency of compressor to drop
Low power output, and then reduce the purpose of input current, improve the heat condition of input circuit, avoid that excessively stream event occurs
Barrier, improve system reliability.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " 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, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
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, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, 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 and is 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 specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
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, changed, replacing and modification.
Claims (10)
1. the electric current limit frequency method of a kind of convertible frequency air-conditioner, it is characterised in that the convertible frequency air-conditioner includes rectification circuit, power factor (PF)
Correction pfc circuit and compressor, the input of the pfc circuit are connected with the output end of the rectification circuit, the pfc circuit
Output end be connected with the compressor, the described method comprises the following steps：
Obtain the input current virtual value Iin_rms of the convertible frequency air-conditioner；
The input current virtual value Iin_rms is subtracted into default electric current limit frequency threshold value to obtain the input current virtual value
Current differential between Iin_rms and electric current limit frequency threshold value, and the current differential is judged；
If the current differential is more than or equal to first threshold, control the compressor out of service；
If the current differential is more than or equal to Second Threshold and is less than the first threshold, the compressor is controlled according to pre-
If step-length frequency reducing is run, wherein, the Second Threshold is less than the first threshold.
2. according to the method for claim 1, it is characterised in that also include：
If the current differential is more than or equal to the 3rd threshold value and is less than the Second Threshold, the compressor is controlled to keep working as
Preceding running frequency operation.
3. according to the method for claim 2, it is characterised in that also include：
If the current differential is less than the 3rd threshold value, according to the operational mode of the convertible frequency air-conditioner, target temperature and
Indoor environment temperature obtains demand frequency, and the compressor is controlled according to the demand frequency.
4. according to the method for claim 3, it is characterised in that the compressor is controlled according to the demand frequency
System, is specifically included：
If the frequency-splitting between the demand frequency and the current operation frequency of the compressor is more than the default step-length,
The compressor is then controlled to be run according to the default step-length raising frequency；
If the frequency-splitting between the current operation frequency of the compressor and the demand frequency is more than the default step-length,
The compressor is then controlled to be run according to the default step-length frequency reducing；
If the absolute value of the frequency-splitting between the demand frequency and the current operation frequency of the compressor is less than or equal to
The default step-length, then the compressor is controlled to be run with the demand frequency.
5. according to the method for claim 1, it is characterised in that the input current virtual value Iin_rms of convertible frequency air-conditioner is obtained,
Specifically include：
The input current instantaneous value Iin of the pfc circuit is detected, it is described defeated to be obtained according to the input current instantaneous value Iin
Enter current effective value Iin_rms.
6. the electric current limit frequency device of a kind of convertible frequency air-conditioner, it is characterised in that the convertible frequency air-conditioner includes rectification circuit, power factor (PF)
Correction pfc circuit and compressor, the input of the pfc circuit are connected with the output end of the rectification circuit, the pfc circuit
Output end be connected with the compressor, described device includes：
Electric current acquiring unit, for obtaining the input current virtual value Iin_rms of the convertible frequency air-conditioner；
Control unit, it is described to obtain for the input current virtual value Iin_rms to be subtracted into default electric current limit frequency threshold value
Current differential between input current virtual value Iin_rms and electric current limit frequency threshold value, and the current differential is sentenced
It is disconnected, if the current differential is more than or equal to first threshold, control the compressor out of service, if the current differential
More than or equal to Second Threshold and it is less than the first threshold, then controls the compressor to be run according to default step-length frequency reducing, wherein,
The Second Threshold is less than the first threshold.
7. device according to claim 6, it is characterised in that if the current differential is more than or equal to the 3rd threshold value and small
In the Second Threshold, described control unit then controls the compressor to keep current operation frequency operation.
8. device according to claim 7, it is characterised in that if the current differential is less than the 3rd threshold value, institute
State control unit and demand frequency is then obtained according to the operational mode of the convertible frequency air-conditioner, target temperature and indoor environment temperature, and
The compressor is controlled according to the demand frequency.
9. device according to claim 8, it is characterised in that wherein,
If the frequency-splitting between the demand frequency and the current operation frequency of the compressor is more than the default step-length,
Described control unit then controls the compressor to be run according to the default step-length raising frequency；
If the frequency-splitting between the current operation frequency of the compressor and the demand frequency is more than the default step-length,
Described control unit then controls the compressor to be run according to the default step-length frequency reducing；
If the absolute value of the frequency-splitting between the demand frequency and the current operation frequency of the compressor is less than or equal to
The default step-length, described control unit then control the compressor to be run with the demand frequency.
10. device according to claim 6, it is characterised in that the electric current acquiring unit specifically includes：
Current detector, for detecting the input current instantaneous value Iin of the pfc circuit；
Current calculator, for calculating the input current virtual value Iin_rms according to the input current instantaneous value Iin.
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| CN201510475531.0A CN105099322B (en) | 2015-08-05 | 2015-08-05 | The electric current limit frequency method and device of convertible frequency air-conditioner |
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| CN106533283A (en) * | 2016-12-05 | 2017-03-22 | 广东美的制冷设备有限公司 | PMSM control device and air conditioner |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005267A (en) * | 2001-11-23 | 2007-07-25 | 丹福斯驱动器公司 | Frequency converter for different mains voltages |
| CN101267186A (en) * | 2007-01-30 | 2008-09-17 | 洛克威尔自动控制技术股份有限公司 | Systems and methods for improved motor drive power factor control |
| CN101741244A (en) * | 2008-11-07 | 2010-06-16 | 电力集成公司 | Method and apparatus to increase efficiency in a power factor correction circuit |
| CN104113261A (en) * | 2013-07-29 | 2014-10-22 | 广东美的制冷设备有限公司 | Air-conditioner compressor control circuit and variable frequency air-conditioner |
| CN104377951A (en) * | 2014-11-12 | 2015-02-25 | 广东美的制冷设备有限公司 | Power factor correction method and device, air conditioner and electric appliance |
-
2015
- 2015-08-05 CN CN201510475531.0A patent/CN105099322B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101005267A (en) * | 2001-11-23 | 2007-07-25 | 丹福斯驱动器公司 | Frequency converter for different mains voltages |
| CN101267186A (en) * | 2007-01-30 | 2008-09-17 | 洛克威尔自动控制技术股份有限公司 | Systems and methods for improved motor drive power factor control |
| CN101741244A (en) * | 2008-11-07 | 2010-06-16 | 电力集成公司 | Method and apparatus to increase efficiency in a power factor correction circuit |
| CN104113261A (en) * | 2013-07-29 | 2014-10-22 | 广东美的制冷设备有限公司 | Air-conditioner compressor control circuit and variable frequency air-conditioner |
| CN104377951A (en) * | 2014-11-12 | 2015-02-25 | 广东美的制冷设备有限公司 | Power factor correction method and device, air conditioner and electric appliance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533283A (en) * | 2016-12-05 | 2017-03-22 | 广东美的制冷设备有限公司 | PMSM control device and air conditioner |
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|---|---|
| CN105099322A (en) | 2015-11-25 |
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