CN105099322A - Variable-frequency air-conditioner current frequency limiting method and device - Google Patents
Variable-frequency air-conditioner current frequency limiting method and device Download PDFInfo
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- CN105099322A CN105099322A CN201510475531.0A CN201510475531A CN105099322A CN 105099322 A CN105099322 A CN 105099322A CN 201510475531 A CN201510475531 A CN 201510475531A CN 105099322 A CN105099322 A CN 105099322A
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Abstract
The invention discloses a variable-frequency air-conditioner current frequency limiting method and device. A variable-frequency air-conditioner comprises a rectification circuit, a power factor correction PFC circuit and a compressor. The input end of the PFC circuit is connected with the output end of the rectification circuit. The output end of the PFC circuit is connected with the compressor. The method comprises the following steps that the input current effective value Iin_rms of the variable-frequency air-conditioner is acquired; the preset current frequency limiting threshold is subtracted from the input current effective value Iin_rms so that a current difference value of the input current effective value Iin_rms and the current frequency limiting threshold is acquired, and the current difference value is judged; if the current difference value is greater than or equal to a first threshold, the compressor is controlled to stop operation; and if the current difference value is greater than or equal to a second threshold and less than the first threshold, the compressor is controlled to perform underclocking operation according to the preset step length, wherein the second threshold is less than the first threshold so that output power is reduced by controlling operation frequency of the compressor and then an objective of reducing input current is achieved, the heating condition of an input circuit is improved and an over-current fault can be avoided.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly a kind of Current Limits frequency method of convertible frequency air-conditioner and a kind of Current Limits device frequently of convertible frequency air-conditioner.
Background technology
In single phase alternating current power supply input system such as domestic air conditioning, single phase alternating current power supply from electrical network is usual first through uncontrollable full bridge rectifier, again through circuit of power factor correction, then export direct current and be connected to big capacity electrolyte capacitor, being finally supplied to load such as internal switch power supply, compressor and blower fan etc.
In the related, along with the rising of compressor operating frequency, input current increases thereupon, thus makes the device heating in input circuit serious, over current fault also may be caused to enter, cause device failure.Therefore, correlation technique needs to improve.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is the Current Limits frequency method proposing a kind of convertible frequency air-conditioner, and the method can by improving the heating situation of input circuit.
Another object of the present invention is the Current Limits device frequently proposing a kind of convertible frequency air-conditioner.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of Current Limits frequency method of convertible frequency air-conditioner, described convertible frequency air-conditioner comprises rectification circuit, Active PFC pfc circuit and compressor, the input of described pfc circuit is connected with the output of described rectification circuit, the output of described pfc circuit is connected with described compressor, said method comprising the steps of: the input current effective value Iin_rms obtaining described convertible frequency air-conditioner; Described input current effective value Iin_rms is deducted default Current Limits frequency threshold value to obtain described input current effective value Iin_rms and the current differential of described Current Limits frequently between threshold value, and described current differential is judged; If described current differential is more than or equal to first threshold, then control described compressor out of service; If described current differential is more than or equal to Second Threshold and be less than described first threshold, then control described compressor and run according to default step-length frequency reducing, wherein, described Second Threshold is less than described first threshold.
According to the Current Limits frequency method of the convertible frequency air-conditioner that the embodiment of the present invention proposes, obtain input current effective value Iin_rms and the current differential of Current Limits frequently between threshold value, and current differential is judged, if current differential is more than or equal to first threshold, then control compressor out of service; If current differential is more than or equal to Second Threshold and be less than first threshold, then control compressor to run according to default step-length frequency reducing, thus, power output is reduced by the running frequency controlling compressor, and then reach the object reducing input current, improve the heating situation of input circuit, avoid over current fault occurs, improve system reliability.
According to some embodiments of the present invention, the Current Limits frequency method of described convertible frequency air-conditioner also comprises: if described current differential is more than or equal to the 3rd threshold value and is less than described Second Threshold, then control described compressor and keep current operation frequency to run.
According to some embodiments of the present invention, the Current Limits frequency method of described convertible frequency air-conditioner also comprises: if described current differential is less than described 3rd threshold value, then obtain demand frequency according to the operational mode of described convertible frequency air-conditioner, target temperature and indoor environment temperature, and according to described demand frequency, described compressor is controlled.
Further, according to some embodiments of the present invention, according to described demand frequency, described compressor is controlled, specifically comprise: if the frequency-splitting between described demand frequency and the current operation frequency of described compressor is greater than described default step-length, then control described compressor and run according to described default step-length raising frequency; If the frequency-splitting between the current operation frequency of described compressor and described demand frequency is greater than described default step-length, then controls described compressor and run according to described default step-length frequency reducing; If the absolute value of the frequency-splitting between described demand frequency and the current operation frequency of described compressor is less than or equal to described default step-length, then controls described compressor and run with described demand frequency.
According to some embodiments of the present invention, obtain the input current effective value Iin_rms of convertible frequency air-conditioner, specifically comprise: the input current instantaneous value Iin detecting described pfc circuit, to obtain described input current effective value Iin_rms according to described input current instantaneous value Iin.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of Current Limits device frequently of convertible frequency air-conditioner, described convertible frequency air-conditioner comprises rectification circuit, Active PFC pfc circuit and compressor, the input of described pfc circuit is connected with the output of described rectification circuit, the output of described pfc circuit is connected with described compressor, described device comprises: electric current acquiring unit, for obtaining the input current effective value Iin_rms of described convertible frequency air-conditioner; Control unit, for described input current effective value Iin_rms being deducted default Current Limits frequency threshold value to obtain described input current effective value Iin_rms and the current differential of described Current Limits frequently between threshold value, and described current differential is judged, if described current differential is more than or equal to first threshold, then control described compressor out of service, if described current differential is more than or equal to Second Threshold and be less than described first threshold, then control described compressor to run according to default step-length frequency reducing, wherein, described Second Threshold is less than described first threshold.
According to the Current Limits device frequently of the convertible frequency air-conditioner that the embodiment of the present invention proposes, input current effective value Iin_rms and the current differential of Current Limits frequently between threshold value is obtained by control unit, and current differential is judged, if current differential is more than or equal to first threshold, then control compressor out of service; If current differential is more than or equal to Second Threshold and be less than first threshold, then control compressor to run according to default step-length frequency reducing, thus, power output is reduced by the running frequency controlling compressor, and then reach the object reducing input current, improve the heating situation of input circuit, avoid over current fault occurs, improve system reliability.
According to some embodiments of the present invention, if described current differential is more than or equal to the 3rd threshold value and is less than described Second Threshold, described control unit then controls described compressor and keeps current operation frequency to run.
According to some embodiments of the present invention, if described current differential is less than described 3rd threshold value, described control unit then obtains demand frequency according to the operational mode of described convertible frequency air-conditioner, target temperature and indoor environment temperature, and controls described compressor according to described demand frequency.
Further, according to some embodiments of the present invention, if the frequency-splitting between described demand frequency and the current operation frequency of described compressor is greater than described default step-length, described control unit then controls described compressor and runs according to described default step-length raising frequency; If the frequency-splitting between the current operation frequency of described compressor and described demand frequency is greater than described default step-length, described control unit then controls described compressor and runs according to described default step-length frequency reducing; If the absolute value of the frequency-splitting between described demand frequency and the current operation frequency of described compressor is less than or equal to described default step-length, described control unit then controls described compressor and runs with described demand frequency.
According to some embodiments of the present invention, described electric current acquiring unit specifically comprises: current detector, for detecting the input current instantaneous value Iin of described pfc circuit; Current calculator, for calculating described input current effective value Iin_rms according to described input current instantaneous value Iin.
Accompanying drawing explanation
Fig. 1 is the flow chart of the Current Limits frequency method of the input voltage adapting of power factor correction pfc circuit according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the power factor correction pfc circuit according to the embodiment of the present invention; And
Fig. 3 is the block diagram of the Current Limits device frequently of the input voltage adapting of power factor correction pfc circuit according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings Current Limits frequency method and the device of the convertible frequency air-conditioner that the embodiment of the present invention proposes are described.Wherein, single phase alternating current power supply is input to Active PFC PFC (PowerFactorCorrection, power factor correction) circuit after rectifier circuit rectifies.
According to the example of Fig. 2-3, convertible frequency air-conditioner can comprise rectification circuit 10, PFC (PowerFactorCorrection, power factor correction) circuit 20 and compressor 30.Wherein, the input of rectification circuit 10 is connected with single phase alternating current power supply AC, and rectification circuit 10 carries out rectification to obtain the direct current after rectification for the single-phase alternating current provided by single phase alternating current power supply AC; The input of pfc circuit 20 is connected with the output of rectification circuit, and the output of pfc circuit 20 is connected with compressor 30, and pfc circuit 20 is for carrying out power factor correction to power supply.In addition, also can parallel electrolytic electric capacity E1 between the output and compressor 30 of pfc circuit 20.
That is, single phase alternating current power supply AC, through the uncontrollable full-wave rectification of rectification circuit 10, then through pfc circuit 20, exports and receives jumbo electrochemical capacitor E1, and then powers to compressor 30.Wherein, rectification circuit 10 and pfc circuit 20 are as the input circuit of electric supply installation in convertible frequency air-conditioner, and the devices such as the main rectification circuit 10 of input current and pfc circuit 20, current direction is as shown in arrow in short dash line in Fig. 2.
It should be noted that, pfc circuit 20 can adopt the pfc circuit with boost function, also can adopt the pfc circuit without boost function.When employing has the pfc circuit of boost function, pfc circuit 20 also can carry out boosting process to the direct current after rectification while carrying out power factor correction to power supply, think that electrochemical capacitor E1 and compressor 30 provide galvanic current pressure, now, pfc circuit 20 is preferably Boost type pfc circuit, and it can comprise the first inductance, power switch pipe and the first diode.When employing does not have the pfc circuit of boost function, pfc circuit 20 only carries out power factor correction to power supply, and boosting process is not carried out to the direct current after rectification, now, the pfc circuit without boost function can comprise the second inductance, the first electric capacity and the second diode.
The embodiment of composition graphs 2, the embodiment of the present invention proposes a kind of Current Limits frequency method of convertible frequency air-conditioner.
Fig. 1 is the flow chart of the Current Limits frequency method of convertible frequency air-conditioner according to the embodiment of the present invention.Convertible frequency air-conditioner comprises rectification circuit, Active PFC pfc circuit and compressor, and the input of pfc circuit is connected with the output of rectification circuit, and the output of pfc circuit is connected with compressor.As shown in Figure 1, the Current Limits frequency method of convertible frequency air-conditioner comprises the following steps:
S1: the input current effective value Iin_rms obtaining convertible frequency air-conditioner.
According to one embodiment of present invention, the input current effective value Iin_rms obtaining convertible frequency air-conditioner specifically comprises: the input current instantaneous value Iin detecting pfc circuit, to obtain input current effective value Iin_rms according to input current instantaneous value Iin.
That is, the electric current after rectification can be detected to obtain input current DC side instantaneous value Iin, and can according to following formulae discovery input current effective 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 represents mean value calculation.
In addition, according to a concrete example of the present invention, detect input current instantaneous value Iin by resistance sampling method.
S2: input current effective value Iin_rms is deducted default Current Limits frequency threshold value to obtain input current effective value Iin_rms and the current differential of Current Limits frequently between threshold value, and current differential is judged.
Wherein, Current Limits frequently threshold value Iin_thr can be input circuit in a rated operation can the maximum input current of long-time running.For example, be the input circuit of 15A for rated current, Current Limits frequently threshold value Iin_thr (effective value) can be taken as 10A.
S3: if current differential is more than or equal to first threshold, then control compressor out of service.
Wherein, first threshold is current protection buffer value, and for example, be the input circuit of 15A for rated current, first threshold diff1 can be preferably 1A.
S4: if current differential is more than or equal to Second Threshold and be less than first threshold, then control compressor and run according to default step-length frequency reducing, wherein, Second Threshold is less than first threshold, and Second Threshold can be preferably 0.
That is, input current instantaneous value Iin can be detected in real time, and calculate input current effective value Iin_rms according to input current instantaneous value Iin, and according to input current effective value Iin_rms and Current Limits frequency threshold value Iin_thr, Current Limits control is frequently carried out to the running frequency of compressor.
Specifically, at each control cycle, all to input current effective value Iin_rms and Current Limits, the current differential Iin_rms-Iin_thr frequently between threshold value Iin_thr once judges, when current differential Iin_rms-Iin_thr is more than or equal to first threshold diff1, namely as Iin_rms >=(Iin_thr+diff1), judge that input current effective value Iin_rms is in stoppage protection interval, now carry out stoppage protection to convertible frequency air-conditioner, subsequent time running frequency is set 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 diff1, namely as Iin_thr≤Iin_rms< (Iin_thr+diff1), judge that input current effective value Iin_rms is in limit frequently interval, now can carry out compressor frequency reducing operation by default step-length, i.e. subsequent time running frequency=current operation frequency-preset step-length.
According to a concrete example of the present invention, the control cycle of Current Limits frequency method can be preferably 10ms, and default step-length can be preferably 0.01Hz, namely every 1 second compressor running frequency maximumly reduce 1Hz.
Further, according to one embodiment of present invention, the Current Limits frequency method of the embodiment of the present invention also comprises: if current differential is more than or equal to the 3rd threshold value and is less than Second Threshold, then control compressor and keep current operation frequency to run.Wherein, the 3rd threshold value is less than Second Threshold, and the 3rd threshold value is Current Limits retention value frequently, and be the input circuit of 15A for rated current, the 3rd threshold value diff3 can be preferably-1.5A.
That is, at each control cycle, when current differential Iin_rms-Iin_thr is more than or equal to the 3rd threshold value diff3 and is less than Second Threshold diff2, namely as (Iin_thr+diff3)≤Iin_rms<Iin_thr, judge that input current effective value Iin_rms is between holding area, now current operation frequency remains unchanged.
Further, according to one embodiment of present invention, if current differential is less than the 3rd threshold value, then obtain demand frequency according to the operational mode of convertible frequency air-conditioner, target temperature and indoor environment temperature, and frequency controls to compressor according to demand.
Particularly, frequency controls compressor according to demand, specifically comprises: if the frequency-splitting between demand frequency and the current operation frequency of compressor is greater than default step-length, then control compressor and run according to default step-length raising frequency; If the frequency-splitting between the current operation frequency of compressor and demand frequency is greater than default step-length, then controls compressor and run according to default step-length frequency reducing; If the absolute value of the frequency-splitting between demand frequency and the current operation frequency of compressor is less than or equal to default step-length, then controls compressor and run with demand frequency.
That is, at each control cycle, when current differential Iin_rms-Iin_thr is less than the 3rd threshold value diff3, namely as Iin_rms< (Iin_thr+diff3), judge that input current effective value Iin_rms is in normal interval, now on the basis of demand frequency, carry out compressor frequency control by default step-length, if i.e. current operation frequency < (demand frequency-preset step-length), then running frequency=the current operation frequency of subsequent time given+frequency reducing step-length; If current operation frequency > (demand frequency+preset step-length), then running frequency=the current operation frequency of subsequent time given-frequency reducing step-length; Otherwise, the running frequency=demand frequency of subsequent time.
The Current Limits frequency method of the embodiment of the present invention is described in detail below in conjunction with a preferred embodiment.
Suppose that the frequency of the alternating current being input to rectification circuit 10 is 50Hz, namely the input current cycle being input to pfc circuit after rectification is 10ms, detect input current by sampling resistor, sample frequency is 42kHz, and namely the renewal frequency of input current instantaneous value Iin is 42kHz.
Like this, in each input current cycle, the sliding window size that input current average value calculates is 420, input current average value Iin_mean is the mean value of 420 current instantaneous values, input current effective value Iin_rms can be calculated, i.e. Iin_rms=sqrt (2) * Π/4*Iin_mean ≈ 1.11*Iin_mean according to input current average value Iin_mean.After calculating input current effective value Iin_rms, Current Limits can be carried out according to input current effective value Iin_rms and Current Limits frequency threshold value Iin_thr to the running frequency of compressor and frequently control.
In sum, according to the Current Limits frequency method of the convertible frequency air-conditioner that the embodiment of the present invention proposes, obtain input current effective value Iin_rms and the current differential of Current Limits frequently between threshold value, and current differential is judged, if current differential is more than or equal to first threshold, then control compressor out of service; If current differential is more than or equal to Second Threshold and be less than first threshold, then control compressor to run according to default step-length frequency reducing, thus, power output is reduced by the running frequency controlling compressor, and then reach the object reducing input current, improve the heating situation of input circuit, avoid over current fault occurs, improve system reliability.
In order to perform above-described embodiment, the present invention on the other hand embodiment also proposed a kind of Current Limits device frequently of convertible frequency air-conditioner.
Fig. 3 is the block diagram of the Current Limits frequency device according to the convertible frequency air-conditioner of the embodiment of the present invention.As shown in Figure 3, convertible frequency air-conditioner comprises rectification circuit 10, Active PFC pfc circuit 20 and compressor 30, the input of pfc circuit 20 is connected with the output of rectification circuit 10, the output of pfc circuit 20 is connected with compressor 30, and Current Limits frequently device 100 comprises: electric current acquiring unit 101 and control unit 102.
Wherein, electric current acquiring unit 101 is for obtaining the input current effective value Iin_rms of convertible frequency air-conditioner.According to one embodiment of present invention, electric current acquiring unit 101 specifically comprises: current detector 11 and current calculator 12, and current detector 11 is for detecting the input current instantaneous value Iin of pfc circuit 20; Current calculator 12 is for calculating input current effective value Iin_rms according to input current instantaneous value Iin.According to a concrete example of the present invention, current detector 11 detects input current instantaneous value Iin by resistance sampling method.
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 according to following formulae discovery input current effective 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 represents mean value calculation.
Control unit 102 is for deducting default Current Limits frequency threshold value to obtain input current effective value Iin_rms and the current differential of Current Limits frequently between threshold value by input current effective value Iin_rms, and current differential is judged, if current differential is more than or equal to first threshold, then control compressor 30 out of service, if current differential is more than or equal to Second Threshold and be less than first threshold, then control compressor 30 to 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 calculate input current effective value Iin_rms according to input current instantaneous value Iin, then, control unit 102 carries out Current Limits control frequently according to input current effective value Iin_rms and Current Limits frequency threshold value Iin_thr to the running frequency of compressor 30.
It should be noted that, Current Limits frequently threshold value Iin_thr can be input circuit in a rated operation can the maximum input current of long-time running, Second Threshold can be preferably 0.For example, be the input circuit of 15A for rated current, Current Limits frequently threshold value Iin_thr (effective value) can be taken as 10A, and first threshold diff1 can be preferably 1A.
Specifically, at each control cycle, all to input current effective value Iin_rms and Current Limits, the current differential Iin_rms-Iin_thr frequently between threshold value Iin_thr once judges control unit 102, when current differential Iin_rms-Iin_thr is more than or equal to first threshold diff1, namely as Iin_rms >=(Iin_thr+diff1), control unit 102 judges that input current effective value Iin_rms is in stoppage protection interval, now carry out stoppage protection to convertible frequency air-conditioner, subsequent time running frequency is set 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 diff1, namely as Iin_thr≤Iin_rms< (Iin_thr+diff1), it is frequently interval that control unit 102 judges that input current effective value Iin_rms is in limit, now can carry out compressor frequency reducing operation by default step-length, i.e. subsequent time running frequency=current operation frequency-preset step-length.
Further, according to one embodiment of present invention, if current differential is more than or equal to the 3rd threshold value and is less than Second Threshold, control unit 102 control compressors 30 keep current operation frequency to run.
That is, at each control cycle, when current differential Iin_rms-Iin_thr is more than or equal to the 3rd threshold value diff3 and is less than Second Threshold diff2, namely as (Iin_thr+diff3)≤Iin_rms<Iin_thr, control unit 102 judges that input current effective value Iin_rms is between holding area, and now current operation frequency remains unchanged.
Further, according to one embodiment of present invention, if current differential is less than the 3rd threshold value, control unit 102 operational modes according to convertible frequency air-conditioner, target temperature and indoor environment temperature obtain demand frequency, and frequency controls compressor 30 according to demand.
Wherein, if the frequency-splitting between demand frequency and the current operation frequency of compressor is greater than default step-length, control unit 102 control compressors 30 run according to default step-length raising frequency; If the frequency-splitting between the current operation frequency of compressor and demand frequency is greater than default step-length, control unit 102 control compressors 30 run according to default step-length frequency reducing; If the absolute value of the frequency-splitting between demand frequency and the current operation frequency of compressor is less than or equal to default step-length, control unit 102 control compressors 30 run with demand frequency.
That is, at each control cycle, when current differential Iin_rms-Iin_thr is less than the 3rd threshold value diff3, namely as Iin_rms< (Iin_thr+diff3), control unit 102 judges that input current effective value Iin_rms is in normal interval, now on the basis of demand frequency, carry out compressor frequency control by default step-length, if i.e. current operation frequency < (demand frequency-preset step-length), then running frequency=the current operation frequency of subsequent time given+frequency reducing step-length; If current operation frequency > (demand frequency+preset step-length), then running frequency=the current operation frequency of subsequent time given-frequency reducing step-length; Otherwise, the running frequency=demand frequency of subsequent time.
In sum, according to the Current Limits device frequently of the convertible frequency air-conditioner that the embodiment of the present invention proposes, input current effective value Iin_rms and the current differential of Current Limits frequently between threshold value is obtained by control unit, and current differential is judged, if current differential is more than or equal to first threshold, then control compressor out of service; If current differential is more than or equal to Second Threshold and be less than first threshold, then control compressor to run according to default step-length frequency reducing, thus, power output is reduced by the running frequency controlling compressor, and then reach the object reducing input current, improve the heating situation of input circuit, avoid over current fault occurs, improve system reliability.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. the Current Limits frequency method of a convertible frequency air-conditioner, it is characterized in that, described convertible frequency air-conditioner comprises rectification circuit, Active PFC pfc circuit and compressor, the input of described pfc circuit is connected with the output of described rectification circuit, the output of described pfc circuit is connected with described compressor, said method comprising the steps of:
Obtain the input current effective value Iin_rms of described convertible frequency air-conditioner;
Described input current effective value Iin_rms is deducted default Current Limits frequency threshold value to obtain described input current effective value Iin_rms and the current differential of described Current Limits frequently between threshold value, and described current differential is judged;
If described current differential is more than or equal to first threshold, then control described compressor out of service;
If described current differential is more than or equal to Second Threshold and be less than described first threshold, then control described compressor and run according to default step-length frequency reducing, wherein, described Second Threshold is less than described first threshold.
2. method according to claim 1, is characterized in that, also comprises:
If described current differential is more than or equal to the 3rd threshold value and is less than described Second Threshold, then control described compressor and keep current operation frequency to run.
3. method according to claim 2, is characterized in that, also comprises:
If described current differential is less than described 3rd threshold value, then obtains demand frequency according to the operational mode of described convertible frequency air-conditioner, target temperature and indoor environment temperature, and according to described demand frequency, described compressor is controlled.
4. method according to claim 3, is characterized in that, controls, specifically comprise according to described demand frequency to described compressor:
If the frequency-splitting between described demand frequency and the current operation frequency of described compressor is greater than described default step-length, then controls described compressor and run according to described default step-length raising frequency;
If the frequency-splitting between the current operation frequency of described compressor and described demand frequency is greater than described default step-length, then controls described compressor and run according to described default step-length frequency reducing;
If the absolute value of the frequency-splitting between described demand frequency and the current operation frequency of described compressor is less than or equal to described default step-length, then controls described compressor and run with described demand frequency.
5. method according to claim 1, is characterized in that, obtains the input current effective value Iin_rms of convertible frequency air-conditioner, specifically comprises:
Detect the input current instantaneous value Iin of described pfc circuit, to obtain described input current effective value Iin_rms according to described input current instantaneous value Iin.
6. a convertible frequency air-conditioner Current Limits frequently device, it is characterized in that, described convertible frequency air-conditioner comprises rectification circuit, Active PFC pfc circuit and compressor, the input of described pfc circuit is connected with the output of described rectification circuit, the output of described pfc circuit is connected with described compressor, and described device comprises:
Electric current acquiring unit, for obtaining the input current effective value Iin_rms of described convertible frequency air-conditioner;
Control unit, for described input current effective value Iin_rms being deducted default Current Limits frequency threshold value to obtain described input current effective value Iin_rms and the current differential of described Current Limits frequently between threshold value, and described current differential is judged, if described current differential is more than or equal to first threshold, then control described compressor out of service, if described current differential is more than or equal to Second Threshold and be less than described first threshold, then control described compressor to run according to default step-length frequency reducing, wherein, described Second Threshold is less than described first threshold.
7. device according to claim 6, is characterized in that, if described current differential is more than or equal to the 3rd threshold value and is less than described Second Threshold, described control unit then controls described compressor and keeps current operation frequency to run.
8. device according to claim 7, it is characterized in that, if described current differential is less than described 3rd threshold value, described control unit then obtains demand frequency according to the operational mode of described convertible frequency air-conditioner, target temperature and indoor environment temperature, and controls described compressor according to described demand frequency.
9. device according to claim 8, is characterized in that, wherein,
If the frequency-splitting between described demand frequency and the current operation frequency of described compressor is greater than described default step-length, described control unit then controls described compressor and runs according to described default step-length raising frequency;
If the frequency-splitting between the current operation frequency of described compressor and described demand frequency is greater than described default step-length, described control unit then controls described compressor and runs according to described default step-length frequency reducing;
If the absolute value of the frequency-splitting between described demand frequency and the current operation frequency of described compressor is less than or equal to described default step-length, described control unit then controls described compressor and runs with described demand frequency.
10. device according to claim 6, is characterized in that, described electric current acquiring unit specifically comprises:
Current detector, for detecting the input current instantaneous value Iin of described pfc circuit;
Current calculator, for calculating described input current effective value Iin_rms according to described input current instantaneous value Iin.
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