CN104242628A - PFC control method and device of AC-DC convertor and air conditioner - Google Patents
PFC control method and device of AC-DC convertor and air conditioner Download PDFInfo
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a PFC control method of an AC-DC convertor in an air conditioner. The method includes the following steps that the output voltage and the input current of the AC-DC convertor are sampled; integral proportion control is conducted on the output voltage according to a direct current reference voltage so as to obtain a first compensation current, and the input current is processed to obtain a second compensation current; the first compensation current and the second compensation current are superimposed to obtain the current compensation amount; control signals are generated according to the current compensation amount, the output voltage and the input current, and a switching tube of a PFC unit is controlled according to the control signals so as to adjust the output voltage of the AC-DC convertor. By means of the PFC control method, fluctuation of the output voltage of the AC-DC convertor can be effectively reduced so as to lower current ripple, and the service life of an output end capacitor of the AC-DC convertor is prolonged. The invention further discloses a PFC control device of the AC-DC convertor in the air conditioner and the air conditioner.
Description
Technical field
The present invention relates to PFC (Power Factor Correction, power factor correction) technical field, particularly the PFC control device of AC-DC converter and a kind of air conditioner with this PFC control device in the PFC control method of AC-DC converter, a kind of air conditioner in a kind of air conditioner.
Background technology
Along with a large amount of power electronic product access electrical network, a large amount of harmonic currents is created to electrical network, and a large amount of harmonic currents will produce very large harm to this using electricity system.Along with the continuous popularization of convertible frequency air-conditioner, the harmonic wave of air-conditioning, the power factor of air-conditioning all will meet certain standard.
At present, air conditioner generally adopts single-rotor compressor, the DC voltage of single-rotor compressor is caused to occur larger fluctuation because load torque fluctuation compares senior general, and there is larger ripple, and the voltage of fluctuation will affect the reliability of air-conditioner control system, simultaneously due to the existence of DC side bulky capacitor, voltage ripple will produce large ripple current, large ripple current will produce temperature rise on electric capacity, thus can reduce the electric capacity life-span.
Summary of the invention
Object of the present invention is intended to solve above-mentioned technological deficiency at least to a certain extent.
For this reason, first object of the present invention is the power factor correction PFC control method proposing AC-DC converter in a kind of air conditioner, can effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, realize the life-span increasing AC-DC converter output capacitor.
Second object of the present invention is the PFC control device proposing AC-DC converter in a kind of air conditioner.3rd object of the present invention is to propose a kind of air conditioner.
For achieving the above object, in a kind of air conditioner that one aspect of the present invention embodiment proposes, the power factor correction PFC control method of AC-DC converter, comprises the following steps: the output voltage of described AC-DC converter of sampling and input current; Carry out integration ratio IP according to DC reference voltage to described output voltage to control to obtain the first offset current, and process to obtain the second offset current to described input current; Described first offset current and described second offset current are carried out superposing to obtain current compensation amount; Generate control signal according to described current compensation amount and described output voltage and input current, and according to described control signal, the output voltage regulating described AC-DC converter is controlled to the switching tube of PFC unit in described AC-DC converter.
According to the PFC control method of the embodiment of the present invention, acquisition first offset current is controlled by carrying out IP to the output voltage of AC-DC converter, and by carrying out the output current processing acquisition second offset current and AC-DC converter to the input current of AC-DC converter, the output current of the first offset current and the second offset current and AC-DC converter is superposed rear acquisition current compensation amount, control signal is generated with the break-make of the switching tube of control PFC unit according to current compensation amount and output voltage and input current, realize regulating the output voltage of AC-DC converter, thus reduce the fluctuation of output voltage.Therefore, the PFC control method of the embodiment of the present invention can consider that the fluctuation of load situation of air conditioner will cause the output current of AC-DC converter to change, the electric current of change i.e. the second offset current and electric current i.e. the first offset current of obtaining by carrying out integration proportional control to output voltage are compensated as feedback quantity, effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, while improving the output capacitor life-span of AC-DC converter, increasing the efficiency of air-conditioner control system.
According to one embodiment of present invention, before IP control is carried out to described output voltage, also low-pass filtering treatment is carried out to described output voltage.
According to one embodiment of present invention, after described first offset current of acquisition, also amplitude limiting processing is carried out to described first offset current.
According to one embodiment of present invention, the first offset current according to following formulae discovery:
Wherein, I
1for described first offset current, V
reffor described DC reference voltage, V
outfor described output voltage, K
ifor integral coefficient, K
pfor proportionality coefficient.
According to one embodiment of present invention, process to obtain the second offset current to described input current specifically to comprise: take absolute value process to obtain the first electric current to described input current; Low-pass filtering treatment is carried out to obtain the second electric current to described first electric current; Described second offset current is obtained according to described second electric current.
Wherein, the second offset current according to following formulae discovery:
I
dc_in＝(1-D)KI
in
Wherein, I
dc_infor described second offset current, D is the duty ratio controlling described switching tube, I
infor described second electric current, K is gain constant.
For achieving the above object, in a kind of air conditioner that the present invention's another aspect embodiment proposes, the PFC control device of AC-DC converter, comprising: voltage sample module, for the output voltage of described AC-DC converter of sampling; Current sample module, for the input current of described AC-DC converter of sampling; First offset current acquisition module, controls for carrying out IP according to DC reference voltage to described output voltage to obtain the first offset current; Second offset current acquisition module, for processing to obtain the second offset current to described input current; Laminating module, for being undertaken superposing to obtain current compensation amount by described first offset current and described second offset current; PFC control module, for generating control signal according to described current compensation amount and described output voltage and input current, and according to described control signal, the output voltage regulating described AC-DC converter is controlled to the switching tube of PFC unit in described AC-DC converter.
According to the PFC control device of the embodiment of the present invention, first offset current acquisition module controls acquisition first offset current by carrying out IP to the output voltage of AC-DC converter, second offset current acquisition module is by carrying out the output current processing acquisition second offset current and AC-DC converter to the input current of AC-DC converter, the output current of the first offset current and the second offset current and AC-DC converter is superposed rear acquisition current compensation amount by laminating module, PFC control module generates control signal with the break-make of the switching tube of control PFC unit according to current compensation amount and output voltage and input current, realize regulating the output voltage of AC-DC converter, thus reduce the fluctuation of output voltage.Therefore, the PFC control device of the embodiment of the present invention can consider that the fluctuation of load situation of air conditioner will cause the output current of AC-DC converter to change, the electric current of change i.e. the second offset current and electric current i.e. the first offset current of obtaining by carrying out integration proportional control to output voltage are compensated as feedback quantity, effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, while improving the output capacitor life-span of AC-DC converter, increasing the efficiency of air-conditioner control system.
According to one embodiment of present invention, described first offset current acquisition module before IP control is carried out to described output voltage, also for carrying out low-pass filtering treatment to described output voltage.
According to one embodiment of present invention, described first offset current acquisition module acquisition described first offset current after, also for carrying out amplitude limiting processing to described first offset current.
According to one embodiment of present invention, described first offset current acquisition module first offset current according to following formulae discovery:
Wherein, I
1for described first offset current, V
reffor described DC reference voltage, V
outfor described output voltage, K
ifor integral coefficient, K
pfor proportionality coefficient.
According to one embodiment of present invention, described second offset current acquisition module specifically comprises: the first electric current acquiring unit, for the process that takes absolute value to described input current to obtain the first electric current; Low-pass filter unit, for carrying out low-pass filtering treatment to obtain the second electric current to described first electric current; Second offset current acquiring unit, for obtaining described second offset current according to described second electric current.
Wherein, described second offset current acquiring unit second offset current according to following formulae discovery:
I
dc_in＝(1-D)KI
in
Wherein, I
dc_infor described second offset current, D is the duty ratio controlling described switching tube, I
infor described second electric current, K is gain constant.
In addition, embodiments of the invention also proposed a kind of air conditioner, and it comprises above-mentioned PFC control device.
According to the air conditioner of the embodiment of the present invention, can consider that fluctuation of load situation will cause the output current of AC-DC converter to change, and by PFC control device, the electric current of change i.e. the second offset current and electric current i.e. the first offset current of obtaining by carrying out integration proportional control to the output voltage of AC-DC converter are compensated as feedback quantity, effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, while improving the output capacitor life-span of AC-DC converter, increasing the efficiency of air-conditioner control system.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart of the PFC control method of AC-DC converter in the air conditioner according to the embodiment of the present invention;
Fig. 2 is the PFC control principle block diagram of AC-DC converter in air conditioner according to an embodiment of the invention;
Fig. 3 is the output voltage waveforms contrast schematic diagram according to the present invention's concrete example; And
Fig. 4 is the block diagram of the PFC control device of AC-DC converter in the air conditioner 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.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Describe the PFC control device of AC-DC converter in the PFC control method of AC-DC converter in the air conditioner proposed according to the embodiment of the present invention, air conditioner with reference to the accompanying drawings and there is the air conditioner of this PFC control device.
Fig. 1 is the flow chart of the PFC control method of AC-DC converter in the air conditioner according to the embodiment of the present invention.As shown in Figure 1, in this air conditioner, the PFC control method of AC-DC converter comprises the following steps:
S1, the output voltage of sampling AC-DC converter and input current.
S2, carries out IP (Integral Proportional, integration ratio) according to DC reference voltage to output voltage and controls to obtain the first offset current, and process to obtain the second offset current to input current.
Wherein, in an embodiment of the present invention, it should be noted that, can by carrying out the output current processing acquisition second offset current and AC-DC converter to input current, also Direct Sampling can obtain the output current of AC-DC converter.
S3, is undertaken superposing to obtain current compensation amount by the first offset current and the second offset current.
S4, control signal is generated according to current compensation amount and output voltage and input current, and according to control signal, the output voltage regulating AC-DC converter is controlled to the switching tube of PFC unit in AC-DC converter, realize the fluctuation reducing output voltage, reach the object of the output capacitor ripple current reducing AC-DC converter.
According to one embodiment of present invention, as shown in Figure 2, switching tube can be IGBT, and control signal can be pwm signal.
As shown in Figure 2, sample obtain AC-DC converter output voltage and input current after, first, adopt LPF (Low Pass Filter, low pass filter) low-pass filtering treatment is carried out to the output voltage of AC-DC converter, main purpose is the higher harmonic component existed in Boost circuit (i.e. PFC unit), rectifier and circuit in filtering AC-DC converter circuit.That is, before IP control is carried out to described output voltage, also low-pass filtering treatment is carried out to described output voltage.
Secondly, carry out IP according to DC reference voltage to the output voltage after low-pass filtering treatment to control to obtain the first offset current.According to one embodiment of present invention, the first offset current according to following formulae discovery:
Wherein, I
1for described first offset current, V
reffor described DC reference voltage, V
outfor described output voltage, K
ifor integral coefficient, K
pfor proportionality coefficient.
Further, as shown in Figure 2, the first offset current to calculating also is needed to carry out amplitude limiting processing.That is, according to one embodiment of present invention, after described first offset current of acquisition, also amplitude limiting processing is carried out to described first offset current.
Simultaneously, consider that the fluctuation of load situation of air conditioner will cause the output current of AC-DC converter to change, the PFC control method of the embodiment of the present invention adopts the PFC control strategy injected by AC-DC converter DC side output current, namely the output current obtaining the second offset current and AC-DC converter is processed to the input current of AC-DC converter, the output current injection of the second offset current and AC-DC converter is compensated.
Particularly, according to one embodiment of present invention, as shown in Figure 2, process to obtain the second offset current to described input current to comprise: take absolute value process to obtain the first electric current to described input current; Low-pass filtering treatment is carried out to obtain the second electric current to described first electric current; Described second offset current is obtained according to described second electric current.
Wherein, the second offset current according to following formulae discovery:
I
dc_in＝(1-D)KI
in (2)
Wherein, I
dc_infor described second offset current, D is the duty ratio controlling described switching tube, I
infor described second electric current, K is gain constant.
That is, between the output current of the second offset current and AC-DC converter and the input current of AC-DC converter, relation can be expressed by Boost circuit (the i.e. PFC unit) relational expression in AC-DC converter and formula (2), this just just can calculate the output current of AC-DC converter according to the input current of AC-DC converter, without the need to increasing a current sampling circuit again, reducing hardware cost and dropping into.In an embodiment of the present invention, gain coefficient K can be regulated to reach the object reducing output voltage fluctuation according to the load variations situation of air conditioner, and the response speed of whole system can be improved.
As shown in Figure 2, the first offset current and the second offset current are carried out superposing to obtain current compensation amount B, as one of the importation of PFC control module, current compensation amount B obtains according to following formula:
Then, the duty ratio after compensation can be calculated according to current compensation amount B and by the output voltage after low-pass filtering treatment and the second electric current, the break-make of the pwm signal control IGBT finally corresponding to the duty ratio after compensation, realize regulating the output voltage of AC-DC converter, reach the object that optimization system controls.
Particularly, according to an example of the present invention, the output voltage waveforms of the AC-DC converter after being regulated by above-mentioned PFC control method as shown in Figure 3.As can be seen from Figure 3, the amplitude of the output voltage waveforms of the AC-DC converter after adjustment reduces, and voltage change ratio also reduces, and so just can reach the object of harmonic reduction ripple current.
According to the PFC control method of the embodiment of the present invention, acquisition first offset current is controlled by carrying out IP to the output voltage of AC-DC converter, and by carrying out the output current processing acquisition second offset current and AC-DC converter to the input current of AC-DC converter, the output current of the first offset current and the second offset current and AC-DC converter is superposed rear acquisition current compensation amount, control signal is generated with the break-make of the switching tube of control PFC unit according to current compensation amount and output voltage and input current, realize regulating the output voltage of AC-DC converter, thus reduce the fluctuation of output voltage.Therefore, the PFC control method of the embodiment of the present invention can consider that the fluctuation of load situation of air conditioner will cause the output current of AC-DC converter to change, the electric current of change i.e. the second offset current and electric current i.e. the first offset current of obtaining by carrying out integration proportional control to output voltage are compensated as feedback quantity, effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, while improving the output capacitor life-span of AC-DC converter, increasing the efficiency of air-conditioner control system.
Fig. 4 is the block diagram of the PFC control device of AC-DC converter in the air conditioner according to the embodiment of the present invention.As shown in Figure 4, in this air conditioner, the PFC control device of AC-DC converter comprises voltage sample module (not shown), current sample module (not shown), the first offset current acquisition module 30, second offset current acquisition module 40, laminating module 50 and PFC control module 60.
Wherein, voltage sample module is for the output voltage of AC-DC converter of sampling, and current sample module is for the input current of AC-DC converter of sampling; First offset current acquisition module 30 controls for carrying out IP according to DC reference voltage to described output voltage to obtain the first offset current, and the second offset current acquisition module 40 is for processing to obtain the second offset current to described input current; Laminating module 50 is for being undertaken superposing to obtain current compensation amount by described first offset current and described second offset current, PFC control module 60 for generating control signal according to described current compensation amount and described output voltage and input current, and controls to the switching tube of PFC unit 101 in described AC-DC converter the output voltage regulating described AC-DC converter according to described control signal.
According to one embodiment of present invention, first offset current acquisition module 30 is before carrying out IP control to described output voltage, also for carrying out low-pass filtering treatment to described output voltage, the higher harmonic component existed in Boost circuit (i.e. PFC unit), rectifier and circuit in filtering AC-DC converter circuit.
Further, the first offset current acquisition module 30 acquisition described first offset current after, also for carrying out amplitude limiting processing to described first offset current.
According to one embodiment of present invention, the first offset current acquisition module 30 first offset current according to following formulae discovery:
Wherein, I
1for described first offset current, V
reffor described DC reference voltage, V
outfor described output voltage, K
ifor integral coefficient, K
pfor proportionality coefficient.
Particularly, as shown in Figure 4, the second offset current acquisition module 40 specifically comprises: the first electric current acquiring unit 401, low-pass filter unit 402 and the second offset current acquiring unit 403.Wherein, the first electric current acquiring unit 401 processes for taking absolute value to described input current to obtain the first electric current; Low-pass filter unit 402 is for carrying out low-pass filtering treatment to obtain the second electric current to described first electric current; Second offset current acquiring unit 403 is for obtaining described second offset current according to described second electric current.
Wherein, the second offset current acquiring unit 403 second offset current according to following formulae discovery:
I
dc_in＝(1-D)KI
in
Wherein, I
dc_infor described second offset current, D is the duty ratio controlling described switching tube, I
infor described second electric current, K is gain constant.
According to the PFC control device of the embodiment of the present invention, first offset current acquisition module controls acquisition first offset current by carrying out IP to the output voltage of AC-DC converter, second offset current acquisition module is by carrying out the output current processing acquisition second offset current and AC-DC converter to the input current of AC-DC converter, the output current of the first offset current and the second offset current and AC-DC converter is superposed rear acquisition current compensation amount by laminating module, PFC control module generates control signal with the break-make of the switching tube of control PFC unit according to current compensation amount and output voltage and input current, realize regulating the output voltage of AC-DC converter, thus reduce the fluctuation of output voltage.Therefore, the PFC control device of the embodiment of the present invention can consider that the fluctuation of load situation of air conditioner will cause the output current of AC-DC converter to change, the electric current of change i.e. the second offset current and electric current i.e. the first offset current of obtaining by carrying out integration proportional control to output voltage are compensated as feedback quantity, effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, while improving the output capacitor life-span of AC-DC converter, increasing the efficiency of air-conditioner control system.
In addition, embodiments of the invention also proposed a kind of air conditioner, and it comprises above-mentioned PFC control device.
According to the air conditioner of the embodiment of the present invention, can consider that fluctuation of load situation will cause the output current of AC-DC converter to change, and by PFC control device, the electric current of change i.e. the second offset current and electric current i.e. the first offset current of obtaining by carrying out integration proportional control to the output voltage of AC-DC converter are compensated as feedback quantity, effectively reduce the fluctuation of the output voltage of AC-DC converter and reduce current ripples, while improving the output capacitor life-span of AC-DC converter, increasing the efficiency of air-conditioner control system.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure 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 comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasablely edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, 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 step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.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: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational 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 is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned 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 to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (13)
1. the power factor correction PFC control method of AC-DC converter in air conditioner, is characterized in that, comprise the following steps:
The output voltage of described AC-DC converter of sampling and input current;
Carry out integration ratio IP according to DC reference voltage to described output voltage to control to obtain the first offset current, and process to obtain the second offset current to described input current;
Described first offset current and described second offset current are carried out superposing to obtain current compensation amount;
Generate control signal according to described current compensation amount and described output voltage and input current, and according to described control signal, the output voltage regulating described AC-DC converter is controlled to the switching tube of PFC unit in described AC-DC converter.
2. PFC control method as claimed in claim 1, is characterized in that, before carrying out IP control to described output voltage, also carry out low-pass filtering treatment to described output voltage.
3. PFC control method as claimed in claim 1, is characterized in that, after described first offset current of acquisition, also carries out amplitude limiting processing to described first offset current.
4. PFC control method as claimed in claim 1, is characterized in that, the first offset current according to following formulae discovery:
Wherein, I
1for described first offset current, V
reffor described DC reference voltage, V
outfor described output voltage, K
ifor integral coefficient, K
pfor proportionality coefficient.
5. PFC control method as claimed in claim 1, is characterized in that, process to obtain the second offset current specifically comprise described input current:
Process is taken absolute value to obtain the first electric current to described input current;
Low-pass filtering treatment is carried out to obtain the second electric current to described first electric current;
Described second offset current is obtained according to described second electric current.
6. PFC control method as claimed in claim 5, is characterized in that, the second offset current according to following formulae discovery:
I
dc_in＝(1-D)KI
in
Wherein, I
dc_infor described second offset current, D is the duty ratio controlling described switching tube, I
infor described second electric current, K is gain constant.
7. the PFC control device of AC-DC converter in air conditioner, is characterized in that, comprising:
Voltage sample module, for the output voltage of described AC-DC converter of sampling;
Current sample module, for the input current of described AC-DC converter of sampling;
First offset current acquisition module, controls for carrying out IP according to DC reference voltage to described output voltage to obtain the first offset current;
Second offset current acquisition module, for processing to obtain the second offset current to described input current;
Laminating module, for being undertaken superposing to obtain current compensation amount by described first offset current and described second offset current;
PFC control module, for generating control signal according to described current compensation amount and described output voltage and input current, and according to described control signal, the output voltage regulating described AC-DC converter is controlled to the switching tube of PFC unit in described AC-DC converter.
8. PFC control device as claimed in claim 7, is characterized in that, described first offset current acquisition module before IP control is carried out to described output voltage, also for carrying out low-pass filtering treatment to described output voltage.
9. PFC control device as claimed in claim 7, is characterized in that, described first offset current acquisition module after described first offset current of acquisition, also for carrying out amplitude limiting processing to described first offset current.
10. PFC control device as claimed in claim 7, is characterized in that, described first offset current acquisition module first offset current according to following formulae discovery:
Wherein, I
1for described first offset current, V
reffor described DC reference voltage, V
outfor described output voltage, K
ifor integral coefficient, K
pfor proportionality coefficient.
11. PFC control device as claimed in claim 7, is characterized in that, described second offset current acquisition module specifically comprises:
First electric current acquiring unit, for the process that takes absolute value to described input current to obtain the first electric current;
Low-pass filter unit, for carrying out low-pass filtering treatment to obtain the second electric current to described first electric current;
Second offset current acquiring unit, for obtaining described second offset current according to described second electric current.
12. PFC control device as claimed in claim 11, is characterized in that, described second offset current acquiring unit second offset current according to following formulae discovery:
I
dc_in＝(1-D)KI
in
Wherein, I
dc_infor described second offset current, D is the duty ratio controlling described switching tube, I
infor described second electric current, K is gain constant.
13. 1 kinds of air conditioners, is characterized in that, comprise the PFC control device according to any one of claim 7-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN106160433A (en) * | 2015-03-25 | 2016-11-23 | 神华集团有限责任公司 | A kind of feedback system for controlling current transformer and energy-storage system |
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| CN109442669A (en) * | 2018-11-12 | 2019-03-08 | 奥克斯空调股份有限公司 | A kind of air conditioning control method, device and air conditioner |
| WO2020107956A1 (en) * | 2018-11-30 | 2020-06-04 | 广东美的制冷设备有限公司 | Operation control method and system, and compressor, air conditioner and readable storage medium |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160433A (en) * | 2015-03-25 | 2016-11-23 | 神华集团有限责任公司 | A kind of feedback system for controlling current transformer and energy-storage system |
| CN106160433B (en) * | 2015-03-25 | 2018-11-27 | 国家能源投资集团有限责任公司 | It is a kind of for controlling the feedback system and energy-storage system of current transformer |
| CN107370358A (en) * | 2016-05-13 | 2017-11-21 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | The current loop control method and current loop controller of circuit of power factor correction |
| CN107370358B (en) * | 2016-05-13 | 2021-03-02 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Current loop control method of power factor correction circuit and current loop controller |
| CN109442669A (en) * | 2018-11-12 | 2019-03-08 | 奥克斯空调股份有限公司 | A kind of air conditioning control method, device and air conditioner |
| CN109442669B (en) * | 2018-11-12 | 2020-11-24 | 奥克斯空调股份有限公司 | Air conditioner control method and device and air conditioner |
| WO2020107956A1 (en) * | 2018-11-30 | 2020-06-04 | 广东美的制冷设备有限公司 | Operation control method and system, and compressor, air conditioner and readable storage medium |
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