CN105932871B - The control method of compressor, device and air conditioner in air conditioner - Google Patents
The control method of compressor, device and air conditioner in air conditioner Download PDFInfo
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- CN105932871B CN105932871B CN201610370932.4A CN201610370932A CN105932871B CN 105932871 B CN105932871 B CN 105932871B CN 201610370932 A CN201610370932 A CN 201610370932A CN 105932871 B CN105932871 B CN 105932871B
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- peak value
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- input current
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- air conditioner
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses control method, device and the air conditioners of compressor in a kind of air conditioner, wherein this approach includes the following steps：Sample the instantaneous value of the input current of pfc circuit, and the peak value of the input current according to the instantaneous value of input current calculating pfc circuit；The peak value of input current is judged；If the peak value of input current is greater than the first preset threshold and is less than or equal to the second preset threshold, the given running frequency of compressor is reduced to preset frequency reducing rate, so that compressor frequency reducing is run, wherein the first preset threshold is less than the second preset threshold；If the peak value of input current is greater than the second preset threshold, controls compressor and directly shut down.The control method of compressor in air conditioner according to the present invention can effectively prevent the damage caused by pfc circuit and correlated inputs circuit due to the peak value of input current is excessive, guarantee air conditioner safe and reliable operation.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the control method of compressor, a kind of air-conditioning in a kind of air conditioner
The control device of compressor and a kind of air conditioner with the control device in device.
Background technique
In transducer air conditioning, the single phase alternating current power supply from power grid is generally subjected to full-bridge rectification, then passes through PFC
(Power Factor Correction, PFC) circuit output DC power supply, be supplied to big capacity electrolyte capacitor and
It loads (mainly compressor).
With the raising of compressor operating frequency, bearing power increases, and the current effective value for being input to pfc circuit can also increase
Greatly.When compressor operating frequency is higher, the current effective value of input is larger, at this time in the effect of the pfc circuit fully opened
Under, the peak value of input current can't be too big.
However, when being input to the peak value of input voltage of pfc circuit higher than DC bus-bar voltage required for compressor,
Pfc circuit can be opened partially, be even switched off, so that the peak value that will lead to input current is excessive, it may be defeated to pfc circuit and correlation
Enter circuit to damage, reduces the security reliability of air conditioner.
Summary of the invention
The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, of the invention
One purpose is to propose a kind of control method of compressor in air conditioner, can effectively prevent due to the peak value of input current is excessive
It is damaged caused by pfc circuit and correlated inputs circuit, guarantees air conditioner safe and reliable operation.
Second object of the present invention is to propose a kind of control device of compressor in air conditioner.
Third object of the present invention is to propose a kind of air conditioner.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of controlling party of compressor in air conditioner
Method, wherein the air conditioner includes pfc circuit, be the described method comprises the following steps：Sample the input current of the pfc circuit
Instantaneous value, and calculate according to the instantaneous value of the input current peak value of the input current of the pfc circuit；To the input
The peak value of electric current is judged；It is preset if the peak value of the input current is greater than the first preset threshold and is less than or equal to second
Threshold value then reduces the given running frequency of the compressor to preset frequency reducing rate, so that the compressor frequency reducing is run,
In, first preset threshold is less than second preset threshold；If it is pre- that the peak value of the input current is greater than described second
If threshold value, then controls the compressor and directly shut down.
The control method of compressor in air conditioner according to an embodiment of the present invention, by the input current for sampling pfc circuit
Instantaneous value calculate the peak value of the input current of pfc circuit, and be greater than the first preset threshold and small in the peak value of input current
When the second preset threshold, the given running frequency of compressor is reduced so that compressor frequency reducing is run, and is being inputted
When the peak value of electric current is greater than the second preset threshold, control compressor is directly shut down, as a result, according to the difference of the peak value of input current
Compressor is controlled using different control strategies, can be effectively prevent due to the peak value of input current is excessive to PFC electricity
It is damaged caused by road and correlated inputs circuit, guarantees air conditioner safe and reliable operation.
In addition, in the air conditioner proposed according to that above embodiment of the present invention the control method of compressor can also have it is as follows
Additional technical characteristic：
Specifically, when the peak value of the input current is greater than first preset threshold and is less than or equal to described second in advance
If when threshold value, by unlatching input current peak value frequency limiting function so that the compressor frequency reducing is run, and in the input current
Peak value be less than first preset threshold when subtracting the first preset difference value, by closing input current peak value frequency limiting function, with
The compressor is set to keep current given running frequency constant.
According to one embodiment of present invention, the pfc circuit includes power switch tube, first preset threshold, institute
The second preset threshold and first preset difference value is stated to be determined according to the rated current peak value of the power switch tube.
Specifically, second preset threshold is the rated current peak value of the power switch tube, the first default threshold
Value is the rated current peak value of the power switch tube of 80%-90%, and first preset difference value is described not higher than 30%
The rated current peak value of power switch tube.
According to one embodiment of present invention, the sample frequency of the instantaneous value of the input current is described much larger than being input to
The frequency of the AC power source of air conditioner.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of control dress of compressor in air conditioner
Set, wherein the air conditioner include rectifier bridge, pfc circuit, electrolytic capacitor and IPM (Intelligent Power Module,
Intelligent power module), the input terminal of the rectifier bridge is connected with AC power source, the output end of the rectifier bridge and PFC electricity
The input terminal on road is connected, and the electrolytic capacitor is connected in parallel on the output end of the pfc circuit, and the input terminal of the IPM is connected to institute
The both ends of electrolytic capacitor are stated, the output end of the IPM is connected with the compressor, and the control device includes：Sampling module, institute
State the instantaneous value of input current of the sampling module for sampling the pfc circuit；Computing module, the computing module are used for basis
The instantaneous value of the input current calculates the peak value of the input current of the pfc circuit；Control module, the control module are used for
The peak value of the input current is judged, wherein if the peak value of the input current is greater than the first preset threshold and small
In or be equal to the second preset threshold, the control module then with preset frequency reducing rate reduce the compressor given operation frequency
Rate, so that the compressor frequency reducing is run, wherein first preset threshold is less than second preset threshold；If described
The peak value of input current is greater than second preset threshold, and the control module then controls the compressor and directly shuts down.
The control device of compressor in air conditioner according to an embodiment of the present invention, by the input current for sampling pfc circuit
Instantaneous value calculate the peak value of the input current of pfc circuit, and be greater than the first preset threshold and small in the peak value of input current
When the second preset threshold, the given running frequency of compressor is reduced so that compressor frequency reducing is run, and is being inputted
When the peak value of electric current is greater than the second preset threshold, control compressor is directly shut down, as a result, according to the difference of the peak value of input current
Compressor is controlled using different control strategies, can be effectively prevent due to the peak value of input current is excessive to PFC electricity
It is damaged caused by road and correlated inputs circuit, guarantees air conditioner safe and reliable operation.
In addition, in the air conditioner proposed according to that above embodiment of the present invention the control device of compressor can also have it is as follows
Additional technical characteristic：
Specifically, the control module is used for：It is greater than first preset threshold and small in the peak value of the input current
When second preset threshold, opened by control input current peak value frequency limiting function so that the compressor frequency reducing
Operation, and when the peak value of the input current is less than first preset threshold and subtracts the first preset difference value, it is defeated by controlling
Enter the closing of current peak frequency limiting function, so that the compressor keeps current given running frequency constant.
According to one embodiment of present invention, the pfc circuit includes power switch tube, first preset threshold, institute
The second preset threshold and first preset difference value is stated to be determined according to the rated current peak value of the power switch tube.
Specifically, second preset threshold is the rated current peak value of the power switch tube, the first default threshold
Value is the rated current peak value of the power switch tube of 80%-90%, and first preset difference value is described not higher than 30%
The rated current peak value of power switch tube.
According to one embodiment of present invention, the sample frequency of the instantaneous value of the input current is described much larger than being input to
The frequency of the AC power source of air conditioner.
A kind of air conditioner that embodiment proposes according to a third aspect of the present invention comprising implement according to a second aspect of the present invention
The control device of compressor in the air conditioner that example proposes.
Air conditioner according to an embodiment of the present invention can be used according to the difference of the peak value for the electric current for being input to pfc circuit
Different control strategies control compressor, can effectively prevent due to the peak value of input current is excessive to pfc circuit and
It is damaged caused by correlated inputs circuit, improves security reliability.
Detailed description of the invention
Fig. 1 is the flow chart according to the control method of compressor in the air conditioner of the embodiment of the present invention；
Fig. 2 is according to the circuit diagram in the air conditioner of one embodiment of the invention；
Fig. 3 is the waveform diagram according to input current in the input circuit of the air conditioner of one embodiment of the invention；
Fig. 4 is the waveform diagram according to input current in the input circuit of the air conditioner of another embodiment of the present invention；
Fig. 5 is the waveform diagram of input current in the input circuit according to the air conditioner of another embodiment of the invention；
Fig. 6 is the block diagram according to the control device of compressor in the air conditioner of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawing in the air conditioner to describe the embodiment of the present invention compressor control method, device and air-conditioning
Device.
Fig. 1 is the flow chart according to the control method of compressor in the air conditioner of the embodiment of the present invention.
It should be noted that the air conditioner of the embodiment of the present invention can be transducer air conditioning.As shown in Fig. 2, the air conditioner can
Including rectifier bridge V, pfc circuit, electrolytic capacitor C2 and IPM.Wherein, pfc circuit can be the Boost type PFC with boost function
Circuit.The input terminal of rectifier bridge V is connected with AC power source AC, and the output end of rectifier bridge V is connected with the input terminal of pfc circuit, electricity
Solution capacitor C2 is connected in parallel on the output end of pfc circuit, and the input terminal of IPM is connected to the both ends of electrolytic capacitor C2, the output end of IPM with
Compressor M is connected.Specifically, the rectified bridge V rectification of AC power source AC, and after filter capacitor C1 and Boost type pfc circuit
DC power supply is exported, electrolytic capacitor C2 and IPM is connected to and can finally be provided to compressor M.The Boost type pfc circuit includes reactance
Device L, diode D and power switch tube VT, the power factor that can improve circuit simultaneously and DC bus-bar voltage are (i.e. in Fig. 2
The voltage of electrolytic capacitor C2).
As shown in Figure 1, in the air conditioner of the embodiment of the present invention compressor control method, include the following steps：
S101 samples the instantaneous value of the input current of pfc circuit, and calculates pfc circuit according to the instantaneous value of input current
Input current peak value.
As shown in Fig. 2, pfc circuit is inputted after the AC power source of air conditioner is rectified, it can be by series connection sampling resistor R with pre-
If sample frequency sampling pfc circuit input current instantaneous value Iin.Wherein, the sample frequency of the instantaneous value of input current
It can be substantially larger than the frequency for being input to the AC power source of air conditioner.In one embodiment of the invention, the supply frequency of air conditioner
For 50Hz, that is to say, that the period of the input current of pfc circuit is 10ms.Correspondingly, preset sample frequency can be 40kHz,
Much higher than supply frequency, thus the sample of the instantaneous value sampled in a cycle of pfc circuit input current is more.
In one embodiment of the invention, the instantaneous value of the input current of the pfc circuit sampled can be stored in team
In column, the instantaneous value of input current all in the last one period of the input current of pfc circuit can be then inquired, and is chosen
Peak value of the maximum value therein as the input current of pfc circuit.
Since the sample of the instantaneous value sampled in a cycle of the input current of pfc circuit is more, by above-mentioned
The peak value of method input current calculated can be equal to or be approximately equal to the peak value of actual input current.In implementation of the invention
In example, when preset sample frequency is 40kHz, 400 can be sampled in a cycle (i.e. 10ms) of the input current of pfc circuit
Therefore the instantaneous value of input current is the instantaneous value for choosing maximum input current within a complete period, should also make team
The instantaneous value of input current in column is no less than 400, can guarantee that the instantaneous value of selected maximum input current is most in this way
Possibly it is close or equal to the peak value of input current.
It should be appreciated that the instantaneous value of maximum input current is in the last one period of the input current of pfc circuit
The peak value of newest input current, since the period of the input current of pfc circuit is smaller, the peak value of the newest input current
It approximate can regard the peak value of real-time input current as.
S102 judges the peak value of input current.
S103, if the peak value of input current is greater than the first preset threshold and is less than or equal to the second preset threshold, with
Default frequency reducing rate reduces the given running frequency of compressor, so that compressor frequency reducing is run, wherein the first preset threshold is less than
Second preset threshold.
In an embodiment of the present invention, generally, when the peak value of input current does not rise to greater than the first preset threshold,
Air conditioner can operate normally.And when the peak value of input current is greater than the first preset threshold, it may be to the PFC electricity in air conditioner
Road and correlated inputs circuit damage, for example, it may be possible to make the power switch tube etc. in rectifier bridge, sampling resistor and pfc circuit
It is damaged because of fever.It, generally will not be in a short time to PFC when the peak value of input current is less than or equal to the second preset threshold
Circuit and correlated inputs circuit damage, therefore are greater than the first preset threshold in the peak value of input current and are less than or equal to the
When two preset thresholds, the appropriate given running frequency for reducing compressor.
In one embodiment of the invention, when the peak value of input current is greater than the first preset threshold and is less than or equal to the
When two preset thresholds, by unlatching input current peak value frequency limiting function so that compressor frequency reducing is run, and at the peak of input current
When value subtracts the first preset difference value less than the first preset threshold, by closing input current peak value frequency limiting function, so that compressor
Keep current given running frequency constant.Wherein, presetting frequency reducing rate can be 5Hz/s.With the drop of the running frequency of compressor
Low, the output power of compressor reduces, and the peak value of input current can also decrease.In the given running frequency of control compressor
When reduction, the peak value for calculating input current in real time is still needed to, and subtract first less than the first preset threshold in the peak value of input current
Stop reducing the given running frequency of compressor when preset difference value.Although should be appreciated that in the peak value of input current less than first
When preset threshold, pfc circuit and correlated inputs circuit in air conditioner will not damage because of overcurrent, but if in input electricity
The peak value of stream is equal to the first preset threshold and closes input current peak value frequency limiting function, then the peak value of input current is easy to short
The first preset threshold or more is risen in time again, may cause be repeated several times in execution step S103 in a short time in this way
The control strategy for reducing compressor operating frequency, to influence the performance of air conditioner.Therefore, can be less than in the peak value of input current
When first preset threshold subtracts the first preset difference value, input current peak value frequency limiting function is turned off, so that compressor keeps current
Given running frequency is constant.
Since the control to compressor operating frequency is considered based on the protection to circuit, above-mentioned first is pre-
If threshold value, the second preset threshold and the first preset difference value can be set according to the current parameters of the circuit elements such as power switch tube.
In one embodiment of the invention, the first preset threshold, the second preset threshold and the first preset difference value can be according to power switch
The rated current peak value of pipe determines.Specifically, the second preset threshold can be the rated current peak value of power switch tube.First is default
Threshold value is lower than the second preset threshold, concretely the rated current peak value of the power switch tube of 80%-90%.First preset difference value
Much smaller than the rated current peak value of power switch tube, it can specifically be not higher than the rated current peak value of 30% power switch tube.It lifts
For example, if the rated current peak value of power switch tube is 30A, the second preset threshold can be 30A, and the first preset threshold can be
25A, the first preset difference value can be 3A.
In one particular embodiment of the present invention, DC bus-bar voltage required for compressor may be set to 350V.Such as
Shown in Fig. 3, when AC power source is 220V, the peak value of input voltage is lower than DC bus-bar voltage required for compressor, PFC electricity
Road can be at the state fully opened, and the peak value of input current is less than the first preset threshold at this time.As shown in Figure 4 and Figure 5, it is handing over
When galvanic electricity source is respectively 265V and 285V, the peak value of input voltage is higher than DC bus-bar voltage required for compressor, pfc circuit
The state and closed state, the peak value of the two input current that part unlatching can be respectively at are all larger than the first preset threshold.
S104 controls compressor and directly shuts down if the peak value of input current is greater than the second preset threshold.
It in an embodiment of the present invention, may be in the short time when the peak value of input current is greater than the second preset threshold
It is interior that pfc circuit and correlated inputs circuit are damaged, therefore controllable compressor is directly shut down, to protect as much as possible
Pfc circuit and correlated inputs circuit.
It in one embodiment of the invention, can be when often getting the peak value of an input current, i.e., by input electricity
The peak value of stream is made comparisons with the first preset threshold, with the second preset threshold, and is meeting the item in step S103 or step S104
Corresponding compressor control strategy is taken when part.That is, in an embodiment of the present invention, can carry out one at interval of 10ms
The judgement of the peak value size of secondary input current, thus when the peak value of input current is larger, it can take in a short time corresponding
Control strategy, thus have preferable circuit protection effect.
The control method of compressor in air conditioner according to an embodiment of the present invention, by the input current for sampling pfc circuit
Instantaneous value calculate the peak value of the input current of pfc circuit, and be greater than the first preset threshold and small in the peak value of input current
When the second preset threshold, the given running frequency of compressor is reduced so that compressor frequency reducing is run, and is being inputted
When the peak value of electric current is greater than the second preset threshold, control compressor is directly shut down, as a result, according to the difference of the peak value of input current
Compressor is controlled using different control strategies, can be effectively prevent due to the peak value of input current is excessive to PFC electricity
It is damaged caused by road and correlated inputs circuit, guarantees air conditioner safe and reliable operation.
The control method of compressor in air conditioner to realize above-described embodiment, the present invention also propose to press in a kind of air conditioner
The control device of contracting machine.
Fig. 6 is the block diagram according to the control device of compressor in the air conditioner of the embodiment of the present invention.
It should be noted that the air conditioner of the embodiment of the present invention can be transducer air conditioning.As shown in Fig. 2, the air conditioner can
Including rectifier bridge V, pfc circuit, electrolytic capacitor C2 and IPM.Wherein, pfc circuit can be the Boost type PFC with boost function
Circuit.The input terminal of rectifier bridge V is connected with AC power source AC, and the output end of rectifier bridge V is connected with the input terminal of pfc circuit, electricity
Solution capacitor C2 is connected in parallel on the output end of pfc circuit, and the input terminal of IPM is connected to the both ends of electrolytic capacitor C2, the output end of IPM with
Compressor M is connected.Specifically, the rectified bridge V rectification of AC power source AC, and after filter capacitor C1 and Boost type pfc circuit
DC power supply is exported, electrolytic capacitor C2 and IPM is connected to and can finally be provided to compressor M.The Boost type pfc circuit includes reactance
Device L, diode D and power switch tube VT, the power factor that can improve circuit simultaneously and DC bus-bar voltage are (i.e. in Fig. 2
The voltage of electrolytic capacitor C2).
As shown in fig. 6, in the air conditioner of the embodiment of the present invention compressor control device, including sampling module 10, calculate
Module 20 and control module 30.
Wherein, sampling module 10 is used to sample the instantaneous value of the input current of pfc circuit, and computing module 20 is used for according to defeated
Enter the peak value of the input current of the instantaneous value calculating pfc circuit of electric current, control module 30 is used to carry out the peak value of input current
Judgement, wherein if the peak value of input current is greater than the first preset threshold and is less than or equal to the second preset threshold, control module
30 reduce the given running frequency of compressor to preset frequency reducing rate, so that compressor frequency reducing is run, wherein the first default threshold
Value is less than the second preset threshold；If the peak value of input current is greater than the second preset threshold, control module 30 ifs, controls compressor
Directly shut down.
As shown in Fig. 2, pfc circuit is inputted after the AC power source of air conditioner is rectified, it can be by series connection sampling resistor R with pre-
If sample frequency sampling pfc circuit input current instantaneous value Iin.Wherein, the sample frequency of the instantaneous value of input current
It can be substantially larger than the frequency for being input to the AC power source of air conditioner.In one embodiment of the invention, the supply frequency of air conditioner
For 50Hz, that is to say, that the period of the input current of pfc circuit is 10ms.Correspondingly, preset sample frequency can be 40kHz,
Much higher than supply frequency, thus the sample of the instantaneous value sampled in a cycle of pfc circuit input current is more.
The instantaneous value of the input current for the pfc circuit that sampling module 10 is sampled is stored in queue, and computing module 20 can
The instantaneous value of input current all in the last one period of the input current of pfc circuit is inquired, and chooses maximum therein
It is worth the peak value of the input current as pfc circuit.
Since the sample of the instantaneous value sampled in a cycle of the input current of pfc circuit is more, computing module
The peak value of 20 input currents calculated can be equal to or be approximately equal to the peak value of actual input current.In the embodiment of the present invention
In, when preset sample frequency is 40kHz, can be sampled in a cycle (i.e. 10ms) of the input current of pfc circuit 400 it is defeated
Enter the instantaneous value of electric current, therefore, is the instantaneous value for choosing maximum input current within a complete period, should also make queue
In the instantaneous value of input current be no less than 400, can guarantee that the instantaneous value of selected maximum input current to the greatest extent may be used in this way
Energy ground is close or equal to the peak value of input current.
It should be appreciated that the instantaneous value of maximum input current is in the last one period of the input current of pfc circuit
The peak value of newest input current, since the period of the input current of pfc circuit is smaller, the peak value of the newest input current
It approximate can regard the peak value of real-time input current as.
In an embodiment of the present invention, generally, when the peak value of input current does not rise to greater than the first preset threshold,
Air conditioner can operate normally.And when the peak value of input current is greater than the first preset threshold, it may be to the PFC electricity in air conditioner
Road and correlated inputs circuit damage, for example, it may be possible to make the power switch tube etc. in rectifier bridge, sampling resistor and pfc circuit
It is damaged because of fever.It, generally will not be in a short time to PFC when the peak value of input current is less than or equal to the second preset threshold
Circuit and correlated inputs circuit damage, therefore control module 30 is greater than the first preset threshold in the peak value of input current, and
When less than or equal to the second preset threshold, the appropriate given running frequency for reducing compressor.
In one embodiment of the invention, it is greater than the first preset threshold in the peak value of input current and is less than or equal to the
When two preset thresholds, control module 30 can by control input current peak value frequency limiting function open so that compressor frequency reducing run,
And when the peak value of input current subtracts the first preset difference value less than the first preset threshold, control module 30 can be inputted by control
Current peak frequency limiting function is closed, so that compressor keeps current given running frequency constant.Wherein, presetting frequency reducing rate can be
5Hz/s.With the reduction of the running frequency of compressor, the output power of compressor is reduced, and the peak value of input current also can be therewith
It reduces.When the given running frequency that control module 30 controls compressor reduces, computing module 20 still needs to calculate input electricity in real time
The peak value of stream, control module 30 stop reducing when the peak value of input current subtracts the first preset difference value less than the first preset threshold
The given running frequency of compressor.Although should be appreciated that when the peak value of input current is less than the first preset threshold, in air conditioner
Pfc circuit and correlated inputs circuit will not be damaged because of overcurrent, but if to be equal to first pre- in the peak value of input current
If threshold value controls input current peak value frequency limiting function and closes, then the peak value of input current is easy to rise again in a short time
To more than the first preset threshold, the control for being repeated several times in a short time and executing and reducing compressor operating frequency may cause in this way
Strategy, to influence the performance of air conditioner.Therefore, control module 30 can subtract in the peak value of input current less than the first preset threshold
When removing the first preset difference value, then the closing of input current peak value frequency limiting function is controlled, so that compressor keeps current given operation frequency
Rate is constant.
Since the control to compressor operating frequency is considered based on the protection to circuit, above-mentioned first is pre-
If threshold value, the second preset threshold and the first preset difference value can be set according to the current parameters of the circuit elements such as power switch tube.
In one embodiment of the invention, the first preset threshold, the second preset threshold and the first preset difference value can be according to power switch
The rated current peak value of pipe determines.Specifically, the second preset threshold can be the rated current peak value of power switch tube.First is default
Threshold value is lower than the second preset threshold, concretely the rated current peak value of the power switch tube of 80%-90%.First preset difference value
Much smaller than the rated current peak value of power switch tube, it can specifically be not higher than the rated current peak value of 30% power switch tube.It lifts
For example, if the rated current peak value of power switch tube is 30A, the second preset threshold can be 30A, and the first preset threshold can be
25A, the first preset difference value can be 3A.
In one particular embodiment of the present invention, DC bus-bar voltage required for compressor may be set to 350V.Such as
Shown in Fig. 3, when AC power source is 220V, the peak value of input voltage is lower than DC bus-bar voltage required for compressor, PFC electricity
Road can be at the state fully opened, and the peak value of input current is less than the first preset threshold at this time.As shown in Figure 4 and Figure 5, it is handing over
When galvanic electricity source is respectively 265V and 285V, the peak value of input voltage is higher than DC bus-bar voltage required for compressor, pfc circuit
The state and closed state, the peak value of the two input current that part unlatching can be respectively at are all larger than the first preset threshold.
It in an embodiment of the present invention, may be in the short time when the peak value of input current is greater than the second preset threshold
It is interior that pfc circuit and correlated inputs circuit are damaged, therefore control module 30 can control compressor directly to shut down, with most maximum
Possibly protect pfc circuit and correlated inputs circuit.
In one embodiment of the invention, control module 30 can often get an input current in computing module 20
When peak value, i.e., the peak value of the input current is made comparisons with the first preset threshold, with the second preset threshold, and above-mentioned meeting
Corresponding compressor control strategy is taken when corresponding conditions.That is, in an embodiment of the present invention, can be at interval of 10ms
The judgement of the peak value size an of input current is carried out, thus when the peak value of input current is larger, it can adopt in a short time
Corresponding control strategy is taken, to have preferable circuit protection effect.
The control device of compressor in air conditioner according to an embodiment of the present invention, by the input current for sampling pfc circuit
Instantaneous value calculate the peak value of the input current of pfc circuit, and be greater than the first preset threshold and small in the peak value of input current
When the second preset threshold, the given running frequency of compressor is reduced so that compressor frequency reducing is run, and is being inputted
When the peak value of electric current is greater than the second preset threshold, control compressor is directly shut down, as a result, according to the difference of the peak value of input current
Compressor is controlled using different control strategies, can be effectively prevent due to the peak value of input current is excessive to PFC electricity
It is damaged caused by road and correlated inputs circuit, guarantees air conditioner safe and reliable operation.
Corresponding above-described embodiment, the present invention also propose a kind of air conditioner.
The air conditioner of the embodiment of the present invention, the control dress including compressor in air conditioner according to the above embodiment of the present invention
It sets, specific embodiment can refer to above-described embodiment, and to avoid redundancy, details are not described herein.
Air conditioner according to an embodiment of the present invention can be used according to the difference of the peak value for the electric current for being input to pfc circuit
Different control strategies control compressor, can effectively prevent due to the peak value of input current is excessive to pfc circuit and
It is damaged caused by correlated inputs circuit, improves security reliability.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (11)
1. the control method of compressor in a kind of air conditioner, which is characterized in that the air conditioner includes pfc circuit, the method
Include the following steps：
The instantaneous value of the input current of the pfc circuit is sampled, and the PFC electricity is calculated according to the instantaneous value of the input current
The peak value of the input current on road；
The peak value of the input current is judged；
If the peak value of the input current is greater than the first preset threshold and is less than or equal to the second preset threshold, with default drop
Frequency rate reduces the given running frequency of the compressor, so that the compressor frequency reducing is run, wherein the first default threshold
Value is less than second preset threshold；
If the peak value of the input current is greater than second preset threshold, controls the compressor and directly shut down.
2. the control method of compressor in air conditioner according to claim 1, which is characterized in that when the input current
When peak value is greater than first preset threshold and is less than or equal to second preset threshold, by opening input current peak value limit
Frequency function is so that the compressor frequency reducing is run, and is less than first preset threshold in the peak value of the input current and is subtracted the
When one preset difference value, by closing input current peak value frequency limiting function, so that the compressor keeps currently given running frequency
It is constant.
3. the control method of compressor in air conditioner according to claim 1 or 2, which is characterized in that the pfc circuit packet
Power switch tube is included, first preset threshold, second preset threshold and first preset difference value are according to the power
The rated current peak value of switching tube determines.
4. the control method of compressor in air conditioner according to claim 3, which is characterized in that second preset threshold
For the rated current peak value of the power switch tube, first preset threshold is the power switch tube of 80%-90%
Rated current peak value, the rated current peak value of the power switch tube of first preset difference value not higher than 30%.
5. the control method of compressor in the air conditioner described in any one of according to claim 1, which is characterized in that the input
The sample frequency of the instantaneous value of electric current is much larger than the frequency for being input to the AC power source of the air conditioner.
6. the control device of compressor in a kind of air conditioner, which is characterized in that the air conditioner includes rectifier bridge, pfc circuit, electricity
Solution capacitor and IPM, the input terminal of the rectifier bridge are connected with AC power source, the output end of the rectifier bridge and the pfc circuit
Input terminal be connected, the electrolytic capacitor is connected in parallel on the output end of the pfc circuit, and the input terminal of the IPM is connected to described
The both ends of electrolytic capacitor, the output end of the IPM are connected with the compressor, and the control device includes：
Sampling module, the sampling module are used to sample the instantaneous value of the input current of the pfc circuit；
Computing module, the computing module are used to calculate the input electricity of the pfc circuit according to the instantaneous value of the input current
The peak value of stream；
Control module, the control module is for judging the peak value of the input current, wherein
If the peak value of the input current is greater than the first preset threshold and is less than or equal to the second preset threshold, the control mould
Block then reduces the given running frequency of the compressor to preset frequency reducing rate, so that the compressor frequency reducing is run, wherein institute
The first preset threshold is stated less than second preset threshold；
If the peak value of the input current is greater than second preset threshold, it is straight that control module if, controls the compressor
Connect shutdown.
7. the control device of compressor in air conditioner according to claim 6, which is characterized in that the control module is used
In：
When the peak value of the input current is greater than first preset threshold and is less than or equal to second preset threshold, lead to
Control input current peak value frequency limiting function is crossed to open so that the compressor frequency reducing is run, and it is small in the peak value of the input current
When first preset threshold subtracts the first preset difference value, closed by control input current peak value frequency limiting function, so that institute
Stating compressor keeps current given running frequency constant.
8. the control device of compressor in air conditioner according to claim 6 or 7, which is characterized in that the pfc circuit packet
Power switch tube is included, first preset threshold, second preset threshold and first preset difference value are according to the power
The rated current peak value of switching tube determines.
9. the control device of compressor in air conditioner according to claim 8, which is characterized in that second preset threshold
For the rated current peak value of the power switch tube, first preset threshold is the power switch tube of 80%-90%
Rated current peak value, the rated current peak value of the power switch tube of first preset difference value not higher than 30%.
10. the control device of compressor in the air conditioner according to any one of claim 6, which is characterized in that described defeated
The sample frequency for entering the instantaneous value of electric current is much larger than the frequency for being input to the AC power source of the air conditioner.
11. a kind of air conditioner, which is characterized in that including compressor in the air conditioner according to any one of claim 6-10
Control device.
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| CN106481537B (en) * | 2016-11-25 | 2018-11-27 | 广东美的制冷设备有限公司 | Control method, device and the household electrical appliance of compressor |
| CN106918121A (en) * | 2017-03-31 | 2017-07-04 | 广东美的制冷设备有限公司 | Air-conditioner and its control method and device |
| CN107270500B (en) * | 2017-06-07 | 2020-03-06 | 广东美的制冷设备有限公司 | Air conditioner, compressor control method thereof, and computer-readable storage medium |
| CN107291143B (en) * | 2017-07-31 | 2018-11-23 | 珠海格力电器股份有限公司 | Electrical equipment progress control method and system |
| CN109579389B (en) * | 2018-11-30 | 2021-10-26 | 广东美的制冷设备有限公司 | Air conditioning system, variable frequency controller and alternating current estimation method and device thereof |
| CN109595737B (en) * | 2018-11-30 | 2021-10-26 | 广东美的制冷设备有限公司 | Air conditioning system, variable frequency controller and alternating current estimation method and device thereof |
| CN110137913B (en) * | 2019-05-16 | 2022-03-22 | 宁波奥克斯电气股份有限公司 | PFC (power factor correction) control method and device for frequency conversion equipment and frequency conversion equipment |
| CN110410308B (en) * | 2019-07-03 | 2020-11-06 | 广东美的暖通设备有限公司 | Compressor control method, compressor control device and computer-readable storage medium |
| CN111251824B (en) * | 2020-01-20 | 2021-06-22 | 广州华凌制冷设备有限公司 | Control method and control device of air conditioner and air conditioner |
| CN113685997B (en) * | 2020-05-18 | 2023-04-07 | 青岛海尔空调器有限总公司 | Control method of air conditioner compressor and air conditioner |
| CN113685996B (en) * | 2020-05-18 | 2023-05-16 | 青岛海尔空调器有限总公司 | Control method of air conditioner compressor and air conditioner |
| CN112039026A (en) * | 2020-08-28 | 2020-12-04 | 海信（山东）空调有限公司 | PFC circuit protection device and air conditioner |
| CN114234545A (en) * | 2020-09-09 | 2022-03-25 | 青岛海尔电冰箱有限公司 | Refrigerator and control method thereof |
| CN112910248A (en) * | 2021-01-29 | 2021-06-04 | 国创移动能源创新中心(江苏)有限公司 | Power supply protection circuit and method |
| CN113162395B (en) * | 2021-05-10 | 2023-02-28 | 海信空调有限公司 | PFC (power factor correction) control method and device of variable frequency air conditioner and variable frequency air conditioner |
| CN113625052A (en) * | 2021-08-30 | 2021-11-09 | 青岛海尔空调器有限总公司 | Phase detection method and system for bus voltage ripple of air conditioner compressor |
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