CN105804978A - Control device and method for compressor in air conditioner - Google Patents
Control device and method for compressor in air conditioner Download PDFInfo
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Abstract
The invention discloses a control method for a compressor in an air conditioner. The control method comprises the following steps: detecting the states of a main branch and an auxiliary branch in an interlaced PFC (Power Factor Correction) circuit; if the main branch is in the normal state and the auxiliary branch is in the open-circuit state, acquiring input current of the air conditioner; and judging the trend state of the input current, and controlling the frequency of the compressor in the air conditioner according to the trend state and the input current. The control method for the compressor in the air conditioner can guarantee safe operation of the air conditioner by controlling the frequency of the compressor when the main branch in the interlaced PFC circuit is normal, and the auxiliary branch in the interlaced PFC circuit is open-circuit, so that the reliability of the air conditioner is improved. The invention further discloses a control device for the compressor in the air conditioner.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly to the control method of compressor and the control device of compressor in a kind of air-conditioner in a kind of air-conditioner.
Background technology
Interleaved PFC (PowerFactorCorrection on current transducer air conditioning, Active PFC) circuit, there is the branch road of two inductance, according to input voltage and load current condition, when meeting some requirements, one of them branch road can be first turned on, this branch road is commonly referred to main branch, after meeting some requirements, being then turned on another one branch road, this branch road is commonly referred to sub-branch；Then meet some requirements, close sub-branch, then meet some requirements, close main branch.
In existing control, major and minor branch road is all fixing, once it is determined which branch road is main branch in pfc circuit, which branch road is after sub-branch, immobilizes exactly in the life cycle of converter.This will there are the following problems: when the main branch in pfc circuit is normal, and during sub-branch open circuit, air-conditioner may proceed to, sub-branch also normal situation operating normal by main branch, thus will cause that pfc circuit operating is abnormal, results even in air-conditioner and shuts down.
Summary of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency.
For this, it is an object of the present invention to propose the control method of compressor in a kind of air-conditioner, in interleaved PFC circuit, main branch is normal, sub-branch open circuit time, it is possible to ensure air-conditioner safe handling by controlling the frequency of compressor, improve the reliability of air-conditioner.
Further object is that and propose the control device of compressor in a kind of air-conditioner.
For reaching above-mentioned purpose, the control method of compressor in a kind of air-conditioner that one aspect of the present invention embodiment proposes, comprise the following steps: detect the state of the main branch in interleaved PFC circuit and sub-branch；If described main branch is normal condition, and described sub-branch is open-circuit condition, then obtain the input current of air-conditioner；And judge the trend state of described input current, and according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled.
The control method of compressor in air-conditioner according to embodiments of the present invention, main branch in interleaved PFC circuit is normal condition, sub-branch when being open-circuit condition, by obtaining the input current of air-conditioner and judging that the frequency of compressor in air-conditioner is controlled by the trend state of input current, thus regulating the running current of compressor not over limit value, ensure the safe handling of air-conditioner, improve the reliability of air-conditioner.
According to one embodiment of present invention, according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled, specifically include: when described trend state is for increasing, if meeting Isa > k1*Ia and Isa≤k2*Ia, then controlling described compressor according to raising frequency speed is that Nsa=ksa*Na runs, wherein, Isa is described input current, Ia is the rated current that described main branch is born, Na is acquiescence raising frequency speed, ksa is default raising frequency speed proportional factor, k1 and k2 respectively preset the first scale factor and the second scale factor；When described trend state is for reducing, if meeting Isa≤m1*Ia, then controlling described compressor according to raising frequency speed is that Na runs, and wherein, m1 is the 5th default scale factor.
According to one embodiment of present invention, according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled, specifically include: when described trend state is for increasing, if meeting Isa > k2*Ia and Isa≤k3*Ia, the running frequency then controlling described compressor remains unchanged, and wherein, Isa is described input current, Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor；When described trend state is for reducing, if meeting Isa≤m2*Ia, then controlling described compressor according to raising frequency speed is that Nsa=ksa*Na runs, wherein, m2 is the 6th default scale factor, and Na is acquiescence raising frequency speed, and ksa is default raising frequency speed proportional factor.
According to one embodiment of present invention, according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled, specifically include: when described trend state is for increasing, if meeting Isa > k3*Ia and Isa≤k4*Ia, then reduce the running frequency of described compressor, wherein, Isa is described input current, Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor, and k4 is the 4th default scale factor；When described trend state is for reducing, if meeting Isa≤m3*Ia, then controlling described compressor and keep current operation frequency constant, wherein, m3 is the 7th default scale factor.
According to one embodiment of present invention, if meeting Isa > k4*Ia, then control described compressor and close, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k4 is the 4th default scale factor.
An example according to the present invention, k1 < k2 < k3 < k4=1, ksa is 0.2-0.5, m1 < m2 < m3 < 1.
For reaching above-mentioned purpose, the control device of compressor in a kind of air-conditioner that another aspect of the present invention embodiment proposes, including: detection module, described detection module is used for the state of main branch and the sub-branch detecting in interleaved PFC circuit；Control module, described control module obtains the input current of air-conditioner when described main branch is normal condition and described sub-branch is open-circuit condition, and judge the trend state of described input current, and according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled.
The control device of compressor in air-conditioner according to embodiments of the present invention, the state of the main branch in interleaved PFC circuit and sub-branch is detected by detection module, and the main branch in interleaved PFC circuit is when be normal condition, sub-branch being open-circuit condition, obtain the input current of air-conditioner by controlling module and judge that the frequency of compressor in air-conditioner is controlled by the trend state of input current, thus regulating the running current of compressor not over limit value, ensure the safe handling of air-conditioner, improve the reliability of air-conditioner.
According to one embodiment of present invention, when described trend state is for increasing, if meeting Isa > k1*Ia and Isa≤k2*Ia, it is that Nsa=ksa*Na runs that described control module then controls described compressor according to raising frequency speed, and wherein, Isa is described input current, Ia is the rated current that described main branch is born, Na for acquiescence raising frequency speed, ksa is default raising frequency speed proportional factor, k1 and k2 respectively preset the first scale factor and the second scale factor；When described trend state is for reducing, if meeting Isa≤m1*Ia, it is that Na runs that described control module then controls described compressor according to raising frequency speed, and wherein, m1 is the 5th default scale factor.
According to one embodiment of present invention, when described trend state is for increasing, if meeting Isa > k2*Ia and Isa≤k3*Ia, the running frequency that described control module then controls described compressor remains unchanged, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor；When described trend state is for reducing, if meeting Isa≤m2*Ia, it is that Nsa=ksa*Na runs that described control module then controls described compressor according to raising frequency speed, wherein, m2 is the 6th default scale factor, and Na is acquiescence raising frequency speed, and ksa is default raising frequency speed proportional factor.
According to one embodiment of present invention, when described trend state is for increasing, if meeting Isa > k3*Ia and Isa≤k4*Ia, described control module then reduces the running frequency of described compressor, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, k3 is the 3rd default scale factor, and k4 is the 4th default scale factor；When described trend state is for reducing, if meeting Isa≤m3*Ia, described control module then controls described compressor and keeps current operation frequency constant, and wherein, m3 is the 7th default scale factor.
An example according to the present invention, k1 < k2 < k3 < k4=1, ksa is 0.2-0.5, m1 < m2 < m3 < 1.
Aspect and advantage that the present invention adds will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or that add aspect and advantage will be apparent from easy to understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart of the control method of compressor in air-conditioner according to embodiments of the present invention；
Fig. 2 is the schematic diagram of the electric current detecting main branch and sub-branch in interleaved PFC circuit according to an embodiment of the invention；
Fig. 3 is the schematic diagram of the electric current detecting main branch and sub-branch in interleaved PFC circuit in accordance with another embodiment of the present invention；
Fig. 4 controls the schematic diagram of compressor frequency with the electric current of main branch in interleaved PFC circuit according to an embodiment of the invention；And
Fig. 5 is the block diagram controlling device of compressor in air-conditioner according to embodiments of the present invention.
Detailed description of the invention
Being 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 the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, and is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example for realizing the different structure of the present invention.In order to simplify disclosure of the invention, hereinafter parts and setting to specific examples are described.Certainly, they are only merely illustrative, and are not intended to the restriction present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.This repetition is for purposes of simplicity and clarity, the relation between itself not indicating discussed various embodiment and/or arranging.Additionally, the example of the various specific technique that the invention provides and material, but those of ordinary skill in the art are it can be appreciated that the use of the property of can be applicable to of other techniques and/or other materials.Additionally, fisrt feature described below second feature it " on " structure can include the first and second features and be formed as the embodiment of directly contact, can also including other feature and form the embodiment between the first and second features, such first and second features are not likely to be direct contact.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, can be mechanically connected or electrical connection, can also be the connection of two element internals, it is possible to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, it is possible to understand the concrete meaning of above-mentioned term as the case may be.
The control device of compressor in the control method of compressor in the air-conditioner proposed according to embodiments of the present invention and air-conditioner is described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the control method of compressor in air-conditioner according to embodiments of the present invention.As it is shown in figure 1, the control method of compressor comprises the following steps in this air-conditioner:
S1, detects the state of the main branch in interleaved PFC circuit and sub-branch.
Wherein, can judge whether sub-branch is open-circuit condition by the electric current of the main branch in detection interleaved PFC circuit and sub-branch.
Specifically, as in figure 2 it is shown, the controller in air-conditioner can be main branch by any one branch road in the default interleaved PFC circuit of software, for instance this branch road of preset resistance R1 is main branch, then this branch road of resistance R2 is sub-branch.By detecting the voltage on resistance R1 and resistance R2, then it is changed the electric current being obtained with main branch and sub-branch by controller again, thus judging whether sub-branch is in open-circuit condition.
Or, as it is shown on figure 3, the controller in air-conditioner can be main branch by any one branch road in the default interleaved PFC circuit of software, for instance this branch road of preset resistance R1 is main branch, so this branch road of switching tube Q2 is sub-branch, through the electric current sum that electric current is the two branch road of resistance R3.By detecting the voltage on resistance R1 and resistance R3, then it is changed the electric current being obtained with main branch and total current by controller again, the electric current of sub-branch is the electric current that total current deducts main branch, then can determine whether out whether sub-branch is in open-circuit condition according to the electric current of main branch and sub-branch.
S2, if main branch is normal condition, and sub-branch is open-circuit condition, then obtain the input current of air-conditioner.
S3, it is judged that the trend state of input current, and according to trend state and input current, the frequency of compressor in air-conditioner is controlled.
Further, in step s 2, acquiescence raising frequency speed Na such as 1 hertz/sec of the rated current Ia that bears of main branch and compressor is also obtained.
Therefore, according to one embodiment of present invention, in step S3, according to trend state and input current, the frequency of compressor in air-conditioner is controlled, specifically include: when trend state is for increasing, if meeting Isa > k1*Ia and Isa≤k2*Ia, then controlling compressor according to raising frequency speed is that Nsa=ksa*Na runs, wherein, Isa is input current, and Ia is the rated current that main branch is born, and Na is acquiescence raising frequency speed, ksa is default raising frequency speed proportional factor, k1 and k2 respectively preset the first scale factor and the second scale factor；When trend state is for reducing, if meeting Isa≤m1*Ia, then controlling compressor according to raising frequency speed is that Na runs, and wherein, m1 is the 5th default scale factor.
And, according to one embodiment of present invention, in step S3, according to trend state and input current, the frequency of compressor in air-conditioner is controlled, specifically may also include that when trend state is for increasing, if meeting Isa > k2*Ia and Isa≤k3*Ia, the running frequency then controlling compressor remains unchanged, and wherein, Isa is described input current, Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor；When described trend state is for reducing, if meeting Isa≤m2*Ia, then controlling described compressor according to raising frequency speed is that Nsa=ksa*Na runs, wherein, m2 is the 6th default scale factor, and Na is acquiescence raising frequency speed, and ksa is default raising frequency speed proportional factor.
According to one embodiment of present invention, in step S3, according to trend state and input current, the frequency of compressor in air-conditioner being controlled, specifically may also include that when described trend state is for increasing, if meeting Isa k3*Ia and Isa≤k4*Ia, then reduce the running frequency of described compressor, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, k3 is the 3rd default scale factor, and k4 is the 4th default scale factor；When described trend state is for reducing, if meeting Isa≤m3*Ia, then controlling described compressor and keep current operation frequency constant, wherein, m3 is the 7th default scale factor.
Additionally, in an embodiment of the present invention, if meeting Isa > k4*Ia, then control described compressor and close, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k4 is the 4th default scale factor.
Wherein, specifically, according to the present invention example, k1 < k2 < k3 < k4=1, ksa can be 0.2-0.5, m1 < m2 < m3 < 1.
In sum, as shown in Figure 4, when the trend state of the input current of air-conditioner is increase, if meeting Isa > k1*Ia and Isa≤k2*Ia, the raising frequency speed reducing compressor is Nsa=ksa*Na, the raising frequency speed of restriction compressor；When the trend state of the input current of air-conditioner is reduce, if meeting Isa≤m1*Ia, the raising frequency speed recovering compressor is Na, namely controls the normal raising frequency of compressor.When the trend state of the input current of air-conditioner is increase, if meeting Isa > k2*Ia and Isa≤k3*Ia, the current operation frequency keeping compressor is constant；When the trend state of the input current of air-conditioner is reduce, if meeting Isa≤m2*Ia, controlling compressor by raising frequency speed is that Nsa=ksa*Na runs, the raising frequency speed of restriction compressor.When the trend state of the input current of air-conditioner is reduce, if meeting Isa > k3*Ia and Isa≤k4*Ia, reduces the running frequency of compressor；When the trend state of the input current of air-conditioner is reduce, if meeting Isa≤m3*Ia, controlling compressor and keeping current operation frequency constant.
Further, if meeting Isa > k4*Ia, then close compressor.
It is to say, in an embodiment of the present invention, judge whether that sub-branch is opened a way by detecting the electric current of main branch and sub-branch, if sub-branch open circuit, then control the electric current of main branch and the input current of air-conditioner less than preset value.Wherein, what preset value can divide realize protection, when the input current of air-conditioner increases and more than the first preset value I1, controls compressor and reduces current operation frequency, make compressor current value less than preset value；When detecting that input current is more than the second preset value I2, the current raising frequency speed controlling compressor reduces so that the electric current rate of climb of compressor reduces, wherein, and I2 < I1；When detecting that input current is more than the 3rd preset value I3, and I2 < I3 < I1, the current operation frequency keeping compressor is constant；When detecting that input current is more than the 4th preset value I4, and I2 < I3 < I1 < I4, control compressor and directly shut down.It should be noted that these four preset values are specific to different compressor types and different, its parameter is determined especially by testing.
Specifically, in an example of the present invention, illustrating for a cabinet type convertible frequency air-conditioner of 3P, the electric current under this refrigerating of convertible frequency air conditioner normal operating conditions is 18A.First, by the electric current of the main branch in detection pfc circuit and sub-branch, and judge whether that sub-branch is opened a way, if sub-branch open circuit, then control the electric current of main branch less than preset value.Because main branch electric current is equal to 18A plus sub-branch electric current, so needing the half that electric current preset value is 18A of main branch, i.e. 9A.When the electric current of main branch is more than 9A, direct close compressor.When the electric current of main branch is more than 0.97*9A=8.73A, reduce the running frequency of compressor；When the electric current of main branch is less than or equal to 0.92*9A=8.28A, exiting the limit frequency state of compressor, the current operation frequency keeping compressor is constant.When the electric current of main branch is more than 0.95*9A=8.55A, the current operation frequency keeping compressor is constant；When the electric current of main branch is less than or equal to 0.9*9A=8.1, exits compressor frequency and keep state, the raising frequency speed of restriction compressor.When the electric current of main branch is more than 0.91*9A=8.19, reducing the raising frequency speed of compressor, usual raising frequency speed is 1 hertz/sec, reduces to 0.4 hertz/sec；When the electric current of main branch is less than or equal to 0.87*9A=7.83, exit compressor raising frequency speed restriction state, control compressor and carry out raising frequency with usual raising frequency speed such as 1 hertz/sec.
The control method of compressor in air-conditioner according to embodiments of the present invention, main branch in interleaved PFC circuit is normal condition, sub-branch when being open-circuit condition, by obtaining the input current of air-conditioner and judging that the frequency of compressor in air-conditioner is controlled by the trend state of input current, thus regulating the running current of compressor not over limit value, ensure the safe handling of air-conditioner, improve the reliability of air-conditioner.
Fig. 5 is the block diagram controlling device of compressor in air-conditioner according to embodiments of the present invention.As it is shown in figure 5, the control device of compressor includes detection module 10 and controls module 20 in this air-conditioner.
Wherein, detection module 10 is used for the state of main branch and the sub-branch detecting in interleaved PFC circuit, control module 20 and obtain the input current of air-conditioner when main branch is normal condition and sub-branch is open-circuit condition, and judge the trend state of input current, and according to trend state and input current, the frequency of compressor in air-conditioner is controlled.
According to one embodiment of present invention, when trend state is for increasing, if meeting Isa > k1*Ia and Isa≤k2*Ia, it is that Nsa=ksa*Na runs that control module 20 then controls compressor according to raising frequency speed, and wherein, Isa is input current, Ia is the rated current that main branch is born, Na for acquiescence raising frequency speed, ksa is default raising frequency speed proportional factor, k1 and k2 respectively preset the first scale factor and the second scale factor；When described trend state is for reducing, if meeting Isa≤m1*Ia, it is that Na runs that control module 20 then controls described compressor according to raising frequency speed, and wherein, m1 is the 5th default scale factor.
And, according to one embodiment of present invention, when described trend state is for increasing, if meeting Isa > k2*Ia and Isa≤k3*Ia, control module 20 then controls the running frequency of compressor and remains unchanged, and wherein, Isa is described input current, Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor；When described trend state is for reducing, if meeting Isa≤m2*Ia, it is that Nsa=ksa*Na runs that control module 20 then controls described compressor according to raising frequency speed, wherein, m2 is the 6th default scale factor, and Na is acquiescence raising frequency speed, and ksa is default raising frequency speed proportional factor.
According to one embodiment of present invention, when described trend state is for increasing, if meeting Isa > k3*Ia and Isa≤k4*Ia, control module 20 and then reduce the running frequency of compressor, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, k3 is the 3rd default scale factor, and k4 is the 4th default scale factor；When described trend state is for reducing, if meeting Isa≤m3*Ia, control module 20 then controls described compressor and keeps current operation frequency constant, and wherein, m3 is the 7th default scale factor.
Additionally, in an embodiment of the present invention, if meeting Isa > k4*Ia, control module 20 and then control compressor closedown, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k4 is the 4th default scale factor.
Specifically, according to the present invention example, k1 < k2 < k3 < k4=1, ksa is 0.2-0.5, m1 < m2 < m3 < 1.
The control device of compressor in air-conditioner according to embodiments of the present invention, the state of the main branch in interleaved PFC circuit and sub-branch is detected by detection module, and the main branch in interleaved PFC circuit is when be normal condition, sub-branch being open-circuit condition, obtain the input current of air-conditioner by controlling module and judge that the frequency of compressor in air-conditioner is controlled by the trend state of input current, thus regulating the running current of compressor not over limit value, ensure the safe handling of air-conditioner, improve the reliability of air-conditioner.
Describe in flow chart or in this any process described otherwise above or method and be construed as, represent and include the module of code of executable instruction of one or more step for realizing specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press order that is shown or that discuss, including according to involved function by basic mode simultaneously or in the opposite order, performing function, this should be understood by embodiments of the invention person of ordinary skill in the field.
Represent in flow charts or in this logic described otherwise above and/or step, such as, it is considered the sequencing list of executable instruction for realizing logic function, may be embodied in any computer-readable medium, use for instruction execution system, device or equipment (such as computer based system, including the system of processor or other can from instruction execution system, device or equipment instruction fetch the system performing instruction), or use in conjunction with these instruction execution systems, device or equipment.For the purpose of this specification, " computer-readable medium " can be any can comprise, store, communicate, propagate or transmission procedure is for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium includes following: have the electrical connection section (electronic installation) of one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read only memory (ROM), erasable edit read only memory (EPROM or flash memory), fiber device, and portable optic disk read only memory (CDROM).Additionally, computer-readable medium can even is that the paper that can print described program thereon or other suitable media, because can such as by paper or other media be carried out optical scanning, then carry out editing, interpreting or be processed to electronically obtain described program with other suitable methods if desired, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple steps or method can realize with the storage software or firmware in memory and by suitable instruction execution system execution.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: there is the discrete logic of logic gates for data signal realizes logic function, there is the special IC of suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries can be by the hardware that program carrys out instruction relevant and complete, described program can be stored in a kind of computer-readable recording medium, this program upon execution, including the step one or a combination set of of embodiment of the method.
Additionally, each functional unit in each embodiment of the present invention can be integrated in a processing module, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a module.Above-mentioned integrated module both can adopt the form of hardware to realize, it would however also be possible to employ the form of software function module realizes.If described integrated module is using the form realization of software function module and as independent production marketing or use, it is also possible to be stored in a computer read/write memory medium.
Storage medium mentioned above can be read only memory, disk or CD etc..
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 in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, being appreciated that and these embodiments can be carried out multiple change, amendment, replacement and modification without departing from the principles and spirit of the present invention, the scope of the invention and equivalency.
Claims (12)
1. the control method of compressor in an air-conditioner, it is characterised in that comprise the following steps:
Detect the state of the main branch in interleaved PFC circuit and sub-branch；
If described main branch is normal condition, and described sub-branch is open-circuit condition, then obtain the input current of air-conditioner；And
Judge the trend state of described input current, and according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled.
2. the control method of compressor in air-conditioner as claimed in claim 1, it is characterised in that according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled, specifically includes:
When described trend state is for increasing, if meeting Isa > k1*Ia and Isa≤k2*Ia, then controlling described compressor according to raising frequency speed is that Nsa=ksa*Na runs, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and Na is acquiescence raising frequency speed, ksa is default raising frequency speed proportional factor, k1 and k2 respectively preset the first scale factor and the second scale factor；
When described trend state is for reducing, if meeting Isa≤m1*Ia, then controlling described compressor according to raising frequency speed is that Na runs, and wherein, m1 is the 5th default scale factor.
3. the control method of compressor in air-conditioner as claimed in claim 1 or 2, it is characterised in that according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled, specifically includes:
When described trend state is for increasing, if meeting Isa > k2*Ia and Isa≤k3*Ia, then the running frequency controlling described compressor remains unchanged, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor；
When described trend state is for reducing, if meeting Isa≤m2*Ia, then controlling described compressor according to raising frequency speed is that Nsa=ksa*Na runs, wherein, m2 is the 6th default scale factor, and Na is acquiescence raising frequency speed, and ksa is default raising frequency speed proportional factor.
4. the control method of compressor in the air-conditioner as according to any one of claim 1-3, it is characterised in that according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled, specifically includes:
When described trend state is for increasing, if meeting Isa > k3*Ia and Isa≤k4*Ia, then reduce the running frequency of described compressor, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, k3 is the 3rd default scale factor, and k4 is the 4th default scale factor；
When described trend state is for reducing, if meeting Isa≤m3*Ia, then controlling described compressor and keep current operation frequency constant, wherein, m3 is the 7th default scale factor.
5. the control method of compressor in air-conditioner as claimed in claim 1, it is characterised in that if meeting Isa > k4*Ia, then controlling described compressor to close, wherein, Isa is described input current, Ia is the rated current that described main branch is born, and k4 is the 4th default scale factor.
6. the control method of compressor in air-conditioner as claimed in claim 4, it is characterised in that k1 < k2 < k3 < k4=1, ksa is 0.2-0.5, m1 < m2 < m3 < 1.
7. the control device of compressor in an air-conditioner, it is characterised in that including:
Detection module, described detection module is used for the state of main branch and the sub-branch detecting in pfc circuit；
Control module, described control module obtains the input current of air-conditioner when described main branch is normal condition and described sub-branch is open-circuit condition, and judge the trend state of described input current, and according to described trend state and described input current, the frequency of compressor in described air-conditioner is controlled.
8. the control device of compressor in air-conditioner as claimed in claim 7, it is characterised in that
When described trend state is for increasing, if meeting Isa > k1*Ia and Isa≤k2*Ia, it is that Nsa=ksa*Na runs that described control module then controls described compressor according to raising frequency speed, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and Na is acquiescence raising frequency speed, ksa is default raising frequency speed proportional factor, k1 and k2 respectively preset the first scale factor and the second scale factor；
When described trend state is for reducing, if meeting Isa≤m1*Ia, it is that Na runs that described control module then controls described compressor according to raising frequency speed, and wherein, m1 is the 5th default scale factor.
9. the control device of compressor in air-conditioner as claimed in claim 7 or 8, it is characterised in that
When described trend state is for increasing, if meeting Isa > k2*Ia and Isa≤k3*Ia, the running frequency that described control module then controls described compressor remains unchanged, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor；
When described trend state is for reducing, if meeting Isa≤m2*Ia, it is that Nsa=ksa*Na runs that described control module then controls described compressor according to raising frequency speed, wherein, m2 is the 6th default scale factor, and Na is acquiescence raising frequency speed, and ksa is default raising frequency speed proportional factor.
10. the control device of compressor in air-conditioner as claimed in any one of claims 7-9, it is characterised in that
When described trend state is for increasing, if meeting Isa > k3*Ia and Isa≤k4*Ia, described control module then reduces the running frequency of described compressor, wherein, Isa is described input current, Ia is the rated current that described main branch is born, and k3 is the 3rd default scale factor, and k4 is the 4th default scale factor；
When described trend state is for reducing, if meeting Isa≤m3*Ia, described control module then controls described compressor and keeps current operation frequency constant, and wherein, m3 is the 7th default scale factor.
11. the control device of compressor in air-conditioner as claimed in claim 7, it is characterized in that, if meeting Isa > k4*Ia, described control module then controls described compressor and closes, wherein, Isa is described input current, and Ia is the rated current that described main branch is born, and k4 is the 4th default scale factor.
12. the control device of compressor in air-conditioner as claimed in claim 10, it is characterised in that k1 < k2 < k3 < k4=1, ksa is 0.2-0.5, m1 < m2 < m3 < 1.
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| CN105804978B (en) | 2017-12-12 |
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