CN106787672A - Voltage limit frequency method and the device of the input voltage adapting of pfc circuit - Google Patents
Voltage limit frequency method and the device of the input voltage adapting of pfc circuit Download PDFInfo
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- CN106787672A CN106787672A CN201611062770.4A CN201611062770A CN106787672A CN 106787672 A CN106787672 A CN 106787672A CN 201611062770 A CN201611062770 A CN 201611062770A CN 106787672 A CN106787672 A CN 106787672A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000000926 separation method Methods 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 230000033228 biological regulation Effects 0.000 abstract description 7
- 239000003990 capacitor Substances 0.000 description 9
- 238000004378 air conditioning Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
Classifications
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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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A kind of voltage the invention discloses input voltage adapting of pfc circuit limits frequency method and device, wherein, the load of the output end connection of pfc circuit is compressor, be the described method comprises the following steps：Obtain the input voltage virtual value of pfc circuit；Frequency threshold value is limited according to the voltage that input voltage virtual value, outdoor environment temperature and indoor environment temperature obtain compressor；And the control compressor limit frequency operation of frequency threshold value is limited according to voltage.So as to reach the temperature for reducing heater members in input circuit and the purpose for reducing input current by the regulation to compressor operating frequency, the safety and reliability of system is improved.
Description
Technical field
The present invention relates to control technology field, the voltage limit frequency of more particularly to a kind of input voltage adapting of pfc circuit
Voltage limit frequency device and a kind of household electrical appliance with the device of method, a kind of input voltage adapting of pfc circuit.
Background technology
In single phase alternating current power supply input system such as domestic air conditioning, the single phase alternating current power supply from power network is generally first passed through
After uncontrollable full bridge rectifier, then by PFC (Power Factor Correct ion, PFC) circuit output
Dc source, and it is connected to big capacity electrolyte capacitor and load (such as compressor, blower fan, internal switch power supply etc.).
Wherein, pfc circuit can use typical Boost type pfc circuit, can not only reach power factor higher,
And the output galvanic current pressure that can boost, so as to provide galvanic current source to load.So, single-phase alternating current is worked as
When the alternating voltage of source input system is relatively low, due to the boosting of pfc circuit, DC bus-bar voltage can still reach higher
Amplitude so that compressor operating to upper frequency.But, it is defeated when alternating voltage amplitude is relatively low when normal compared to alternating voltage
The amplitude entered to the input current of pfc circuit can increase so that the device heating in input circuit is serious.Particularly with using friendship
For the air-conditioning system that flow fan is radiated, the rotating speed of AC blower fan is reduced with the decline of alternating voltage amplitude, so that
So that the heat-sinking capability reduction of air-conditioning system, causes the device heating in input circuit even more serious.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, of the invention
One purpose is the voltage limit frequency method for proposing a kind of input voltage adapting of pfc circuit, by compressor operating frequently
The regulation of rate reduces the temperature of heater members in input circuit and the purpose of reduction input current to reach, and improves the peace of system
Full property and reliability.
A kind of voltage it is an object of the present invention to propose input voltage adapting of pfc circuit limits frequency device.
A further object of the present invention is to propose a kind of household electrical appliance.
To achieve the above object, one aspect of the present invention embodiment proposes a kind of input voltage adapting of pfc circuit
Voltage limits frequency method, and the load of the output end connection of pfc circuit is compressor, be the described method comprises the following steps：Obtain described
The input voltage virtual value of pfc circuit；Obtained according to the input voltage virtual value, outdoor environment temperature and indoor environment temperature
The voltage limit frequency threshold value of the compressor；And the frequency threshold value control compressor limit frequency operation is limited according to the voltage.
The voltage limit frequency method of the input voltage adapting of pfc circuit according to embodiments of the present invention, obtains pfc circuit
Input voltage virtual value, and the electricity of compressor is obtained according to input voltage virtual value, outdoor environment temperature and indoor environment temperature
Pressure limit frequency threshold value, and run according to voltage limit frequency threshold value control compressor limit frequency, so that by compressor operating frequency
Adjust to reach the temperature for reducing heater members in input circuit and the purpose for reducing input current, improve the security of system
And reliability.
In an embodiment of the present invention, can be by direct consulting method, sluggish interval inquiry mode or piece-wise linearization
Mode obtains the voltage limit frequency threshold value of the compressor.
According to one embodiment of present invention, when the voltage that the compressor is obtained by table look-at mode limits frequency threshold value
When, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor environment temperature to each voltage
Gear sets M voltage limit frequency threshold value, and using the intermediate point of the corresponding input voltage virtual value of adjacent gear positions as acquisition institute
The separation that voltage limits frequency threshold value is stated, wherein, N and M is the positive integer more than 1.
According to one embodiment of present invention, when the voltage for obtaining the compressor by sluggish interval inquiry mode limits frequency
During threshold value, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor environment temperature to each
Voltage gear sets M voltage limit frequency threshold value, wherein, the N and M is the positive integer more than 1, when the input voltage is effective
When value is in propradation, the intermediate point of adjacent input voltage virtual value is limited plus the first preset value as the voltage is obtained
The separation of frequency threshold value；When the input voltage virtual value is in decline state, by the centre of adjacent input voltage virtual value
Point subtracts the first preset value as the separation for obtaining the voltage limit frequency threshold value.
According to one embodiment of present invention, when the voltage that the compressor is obtained by piece-wise linearization mode limits frequency threshold
During value, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor environment temperature to each electricity
Pressure gear sets M voltage limit frequency threshold value, and linearly calculates the electricity according to the corresponding input voltage virtual value of adjacent gear positions
Pressure limit frequency threshold value, wherein, the N and M is the positive integer more than 1.
To achieve the above object, the input voltage adapting of a kind of pfc circuit that another aspect of the present invention embodiment is proposed
Voltage limit frequency device, the load of the output end connection of pfc circuit is compressor, and described device includes：Acquisition module, for obtaining
Take the input voltage virtual value of the pfc circuit；Control module, the control module is connected with the acquisition module, the control
Molding block is used to be obtained according to the input voltage virtual value, outdoor environment temperature and indoor environment temperature the electricity of the compressor
Pressure limit frequency threshold value, and control the compressor limit frequency to run according to voltage limit frequency threshold value.
The voltage limit frequency device of the input voltage adapting of pfc circuit according to embodiments of the present invention, by acquisition module
The input voltage virtual value of pfc circuit is obtained, control module is according to input voltage virtual value, outdoor environment temperature and indoor environment
Temperature obtains the voltage limit frequency threshold value of compressor, and controls the compressor limit frequency to run according to voltage limit frequency threshold value, so as to lead to
The regulation to compressor operating frequency is crossed to reach the temperature for reducing heater members in input circuit and the mesh for reducing input current
, improve the safety and reliability of system.
In an embodiment of the present invention, the control module can by direct consulting method, sluggish interval inquiry mode or
Person's piece-wise linearization mode obtains the voltage limit frequency threshold value of the compressor.
According to one embodiment of present invention, when the voltage that the compressor is obtained by table look-at mode limits frequency threshold value
When, input voltage virtual value is divided into N number of gear by the control module, and according to outdoor environment temperature and indoor environment temperature
Degree sets M voltage to each voltage gear and limits frequency threshold value, and by the centre of the corresponding input voltage virtual value of adjacent gear positions
Point limits the separation of frequency threshold value as the voltage is obtained, wherein, N and M is the positive integer more than 1.
According to one embodiment of present invention, when the voltage for obtaining the compressor by sluggish interval inquiry mode limits frequency
During threshold value, input voltage virtual value is divided into N number of gear by the control module, and according to outdoor environment temperature and indoor ring
Border temperature sets M voltage limit frequency threshold value to each voltage gear, wherein, the N and M is the positive integer more than 1, when described
When input voltage virtual value is in propradation, the intermediate point of adjacent input voltage virtual value is added first by the control module
Preset value limits the separation of frequency threshold value as the voltage is obtained；When the input voltage virtual value is in decline state, institute
State control module and the intermediate point of adjacent input voltage virtual value is subtracted the first preset value as the acquisition voltage limit frequency threshold value
Separation.
According to one embodiment of present invention, when the voltage that the compressor is obtained by piece-wise linearization mode limits frequency threshold
During value, input voltage virtual value is divided into N number of gear by the control module, and according to outdoor environment temperature and indoor environment
Temperature sets M voltage limit frequency threshold value to each voltage gear, and according to the corresponding input voltage virtual value line of adjacent gear positions
Property calculate voltage limit frequency threshold value, wherein, the N and M is the positive integer more than 1.
Additionally, embodiments of the invention also proposed a kind of household electrical appliance, its input voltage for including above-mentioned pfc circuit
The voltage limit frequency device of self adaptation.
The household electrical appliance of the embodiment of the present invention, limit frequency and fill by the voltage of the input voltage adapting of above-mentioned pfc circuit
Put, the temperature of heater members in reduction input circuit can be reached by the regulation to compressor operating frequency and is reduced defeated
Enter the purpose of electric current, improve the safety and reliability of system.
Brief description of the drawings
Fig. 1 is the flow chart of the voltage limit frequency method of the input voltage adapting of pfc circuit according to embodiments of the present invention；
Fig. 2 is the circuit theory diagrams of pfc circuit according to an embodiment of the invention；
Fig. 3 is the circuit topology figure of the pfc circuit with boost function according to an embodiment of the invention；
Fig. 4 is the circuit topology figure of the pfc circuit without boost function according to an embodiment of the invention；And
Fig. 5 is that the square frame of the voltage limit frequency device of the input voltage adapting of pfc circuit according to embodiments of the present invention shows
It is intended to.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The voltage of the input voltage adapting of the pfc circuit of proposition according to embodiments of the present invention described with reference to the accompanying drawings
Voltage limit frequency device and the household electrical appliance of limit frequency method, the input voltage adapting of pfc circuit.
According to the example of Fig. 2-4, the electric supply installation of household electrical appliance (such as convertible frequency air-conditioner) may include rectification circuit 10, PFC electricity
Road 20 and electrochemical capacitor E1.Wherein, the input of rectification circuit 10 is connected with single phase alternating current power supply AC, and rectification circuit 10 is used for will
The single-phase alternating current that single phase alternating current power supply AC is provided carries out rectification to obtain the direct current after rectification；Pfc circuit 20 is connected to whole
Between the output end and electrochemical capacitor E1 of current circuit 10, pfc circuit 20 is used to carry out PFC to power supply；Electrochemical capacitor
E1 is in parallel with load 30, wherein, load 30 is preferably compressor M, load 30 or internal switch power supply, DC fan
Deng.That is, uncontrollable full-wave rectifications of the single phase alternating current power supply AC by rectification circuit 10, defeated then by pfc circuit 20
Go out to be connected to the electrochemical capacitor E1 of Large Copacity, and then powered to load 30.
It should be noted that pfc circuit 20 can be using the pfc circuit with boost function, also can be using without boosting
The pfc circuit of function.
Specifically, pfc circuit 20 can be using the Boost type pfc circuit with boost function shown in Fig. 3, rectification circuit
10 have the first output end and the second output end, and Boost type pfc circuit may include the first inductance L1, power switch tube S 1 and the
One diode D1, wherein, one end of the first inductance L1 is connected with the first output end of rectification circuit 10, and the first inductance L1's is another
End is connected with the anode of the first diode D1, has first node between the first inductance L1 and the first diode D1；One or two pole
The negative electrode of pipe D1 is connected with the positive terminal of electrochemical capacitor E1；The colelctor electrode of power switch tube S 1 is connected with first node, and power is opened
The emitter stage for closing pipe S1 is connected with the second output end of rectification circuit 10 and the negative pole end of electrochemical capacitor E1 respectively.
In the fig. 3 embodiment, after pfc circuit 20 can also be to rectification while PFC is carried out to power supply
Direct current carries out boosting treatment, and galvanic current pressure is provided with to electrochemical capacitor E1 and load 30.Now, the He of rectification circuit 10
Pfc circuit 20 as electric supply installation input circuit, input circuit mainly has rectification circuit 10, the first inductance L1, power switch
The device such as pipe S1 and the first diode D1, current direction is as shown in arrow in short dash line in Fig. 3.
Specifically, pfc circuit 20 can also be had using the pfc circuit without boost function shown in Fig. 4, rectification circuit 10
Have the first output end and the second output end, the pfc circuit without boost function may include the second inductance L2, the first electric capacity C1 and
Second diode D2, wherein, the second inductance L2 connects with the second diode D2, one end and the rectification circuit 10 of the second inductance L2
First output end is connected, and the other end of the second inductance L2 is connected with the anode of the second diode D2, the negative electrode of the second diode D2
Positive terminal with electrochemical capacitor E1 is connected；First electric capacity C1 is in parallel with the second diode D2 with the second inductance L2 for connecting, and first
One end of electric capacity C1 is connected with one end of the second inductance L2, the negative electrode phase of the other end of the first electric capacity C1 and the second diode D2
Even.
In the fig. 4 embodiment, pfc circuit 20 only carries out PFC to power supply, not to the direct current after rectification
Carry out boosting treatment.Now, rectification circuit 10 and pfc circuit 20 as electric supply installation input circuit, input circuit mainly has
The devices such as rectification circuit 10, the second inductance L2, the first electric capacity C1, the second diode D2, arrow in short dash line in current direction such as Fig. 4
Shown in head.
With reference to the embodiment of Fig. 2-4, one aspect of the present invention embodiment proposes a kind of input voltage adapting of pfc circuit
Voltage limit frequency method.
Fig. 1 is the flow chart of the voltage limit frequency method of the input voltage adapting of pfc circuit according to embodiments of the present invention.
The load of the output end connection of pfc circuit is compressor, as shown in figure 1, the voltage limit of the input voltage adapting of the pfc circuit
Frequency method may include following steps：
S1, obtains the input voltage virtual value of pfc circuit.
In an embodiment of the present invention, can be according to input voltage AC instantaneous value Vin_ac or input voltage DC side wink
Duration Vin_dc calculates the input voltage virtual value Vin_rms of pfc circuit.
That is, can detect the voltage after rectification to obtain input voltage DC side instantaneous value Vin_dc, or detection
Voltage before rectification is obtaining input voltage AC instantaneous value Vin_ac.Wherein, input electricity can be detected by divider resistance method
Pressure DC side instantaneous value Vin_dc.
Specifically, input voltage virtual value Vin_rms can be calculated according to below equation：
Vin_rms=sqrt (2) * Π/4*Vin_mean ≈ 1.11*Vin_mean,
Wherein, Vin_mean is input voltage average value, Vin_mean=MEAN (| Vin_ac |) or Vin_mean=
MEAN (Vin_dc), wherein | | expression asks absolute value, MEAN to represent mean value calculation.
S2, frequency is limited according to the voltage that input voltage virtual value, outdoor environment temperature and indoor environment temperature obtain compressor
Threshold value.
It should be noted that voltage limit frequency threshold value is different input voltage virtual values, different operating condition (indoor environment temperature
Degree and outdoor environment temperature) under, input circuit device meets the maximum running frequency of application temperature standard.Rated voltage and with
In lower scope, input voltage amplitude is lower, and voltage limit frequency threshold value is smaller.
S3, limits frequency threshold value control compressor limit frequency and runs according to voltage.
Specifically, during compressor operating, real-time detection input voltage AC instantaneous value Vin_ac or defeated
Enter voltage DC side instantaneous value Vin_dc, and calculate input voltage virtual value Vin_rms, then, according to input voltage virtual value
Vin_rms and current operating condition (including indoor environment temperature and outdoor environment temperature) select corresponding voltage limit frequency threshold value,
And control the running frequency of compressor to limit frequency threshold value no more than the voltage, so that run by controlling compressor to limit frequency, to reach
Reduce input current, reduce the purpose of input circuit device heating.
It should be noted that for the air-conditioning system radiated using AC blower fan, although AC blower fan turns
Speed is reduced with the decline of alternating voltage amplitude so that the heat-sinking capability reduction of air-conditioning system, but, through the above way can
Enough so that in input circuit heater members caloric value reduce, even if thus AC blower fan rotating speed decline, do not result in defeated yet
Heater members heating is even more serious in entering circuit.
In an embodiment of the present invention, can be by direct consulting method, sluggish interval inquiry mode or piece-wise linearization
Mode obtains the voltage limit frequency threshold value of compressor.
Specifically, according to one embodiment of present invention, when the voltage that compressor is obtained by table look-at mode limits frequency
During threshold value, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor environment temperature to each
Voltage gear sets M voltage and limits frequency threshold value, and using the intermediate point of the corresponding input voltage virtual value of adjacent gear positions as obtaining
The separation that the voltage limits frequency threshold value is taken, wherein, N and M is the positive integer more than 1.
Specifically, input voltage virtual value can be using 10V as a gear, and each gear corresponds to different outdoors
Operating mode 1, operating mode 2, operating mode 3 of environment temperature and indoor environment temperature etc., by testing different gears, different operating mode under meet defeated
Enter the maximum running frequency of circuit devcie heating temp standard, limit frequency threshold value as corresponding voltage, as shown in table 1.
Table 1
When the voltage that compressor is obtained by table look-at mode limits frequency threshold value, the separation of input voltage virtual value
(obtaining the separation that voltage limits frequency threshold value) is 215V, 205V, 195V, 185V, 175V, 165V, 155V ..., now direct root
Corresponding voltage limit frequency threshold value is inquired about according to input voltage virtual value Vin_rms and current operating condition.For example, when input voltage has
When valid value Vin_rms is in the range of 155V~165V, corresponding voltage limit frequency threshold value is the corresponding voltage limit frequency threshold values of 160V, so
Further determine that it is operating mode 1 according to current operating condition afterwards, or operating mode 2 etc., it is assumed that be operating mode 1, then it is final to determine voltage limit
Frequency threshold value is FrqLim71；And for example, when input voltage virtual value Vin_rms is in the range of 165V~175V, corresponding voltage
Limit frequency threshold value is the corresponding voltage limit frequency threshold values of 170V, then further determines that it is operating mode 1 according to current operating condition, or work
Condition 2 etc., it is assumed that be operating mode 2, then it is final to determine that voltage limit frequency threshold value is FrqLim62.Then, by limiting the operation of compressor
Frequency limits frequency threshold value no more than the voltage, to reach the temperature for reducing heater members in input circuit and the mesh for reducing input current
's.
According to another embodiment of the invention, when the voltage for obtaining compressor by sluggish interval inquiry mode limits frequency threshold
During value, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor environment temperature to each electricity
Pressure gear sets M voltage limit frequency threshold value, wherein, N and M is the positive integer more than 1, rises when input voltage virtual value is in
During state, using the intermediate point of adjacent input voltage virtual value plus the first preset value as the boundary for obtaining voltage limit frequency threshold value
Point；When input voltage virtual value is in decline state, the intermediate point of adjacent input voltage virtual value is subtracted into the first preset value
As the separation for obtaining voltage limit frequency threshold value.Wherein, the first preset value can be demarcated according to actual conditions.
Specifically, when the voltage for obtaining compressor by sluggish interval inquiry mode limits frequency threshold value, can set defeated
The sluggishness for entering voltage effective value is interval, then right according to sluggish interval, input voltage virtual value Vin_rms and current working inquiry
The voltage limit frequency threshold value answered.For example, it is 4V to set sluggish interval, in theory, the separation that voltage limits frequency threshold value is obtained in table 1
For 215V, 205V, 195V, 185V, 175V, 165V, 155V ..., but after it increased sluggish interval, when input voltage is effective
Value Vin_rms be in decline during, and input voltage virtual value Vin_rms less than 163V (165V-2V, wherein, 2V is first
Value) when, just select 160V corresponding voltages limit frequency threshold value, and final voltage limit further determined frequently according to current operating condition
Threshold value；In input voltage virtual value Vin_rms is in uphill process, and input voltage virtual value Vin_rms is higher than 167V
When (165V+2V), 170V corresponding voltages limit frequency threshold value is just selected, and final electricity further determined according to current operating condition
Pressure limit frequency threshold value.Then, frequency threshold value is limited no more than the voltage by limiting the running frequency of compressor, input electricity is reduced to reach
The purpose of the temperature of heater members and reduction input current in road.
According to still another embodiment of the invention, when the voltage that compressor is obtained by piece-wise linearization mode limits frequency threshold value
When, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor environment temperature to each voltage
Gear sets M voltage limit frequency threshold value, and linearly calculates voltage limit frequency according to the corresponding input voltage virtual value of adjacent gear positions
Threshold value, wherein, N and M is the positive integer more than 1.
Specifically, when the voltage that compressor is obtained by piece-wise linearization mode limits frequency threshold value, can first according to defeated
Enter voltage effective value Vin_rms and obtain the input voltage virtual value of adjacent gear positions, and further obtain and current operating condition phase
The electric voltage frequency threshold value of the input voltage virtual value of corresponding adjacent gear positions, then, current operation work is calculated using linear mode
Voltage limit frequency threshold value under condition.For example, when input voltage virtual value Vin_rms is 166V and current operating condition is operating mode 1,
Inquire 160V, the corresponding voltage of operating mode 1 to limit frequency threshold value by table 1 is FrqLim71, and inquires 170V, operating mode 1 by table 1
Corresponding voltage limit frequency threshold value is FrqLim61, then, 166V, the corresponding voltage of operating mode 1 can be calculated using linear mode
Limit frequency threshold value FrqLim=(FrqLim61-FrqLim71) * (166V-160V)/(170V-160V)+FrqLim61.Then, lead to
The running frequency for crossing limitation compressor limits frequency threshold value no more than the voltage, and the temperature of heater members in input circuit is reduced to reach
With the purpose for reducing input current.
In sum, the voltage limit frequency method of the input voltage adapting of pfc circuit according to embodiments of the present invention, obtains
The input voltage virtual value of pfc circuit, and pressure is obtained according to input voltage virtual value, outdoor environment temperature and indoor environment temperature
The voltage limit frequency threshold value of contracting machine, and run according to voltage limit frequency threshold value control compressor limit frequency, so as to be transported by compressor
The regulation of line frequency reduces the temperature of heater members in input circuit and the purpose of reduction input current to reach, and improves system
Safety and reliability.
In order to perform above-described embodiment, another aspect of the present invention embodiment also proposed a kind of input voltage of pfc circuit
The voltage limit frequency device of self adaptation.
Fig. 5 is that the square frame of the voltage limit frequency device of the input voltage adapting of pfc circuit according to embodiments of the present invention shows
It is intended to.As shown in figure 5, the load 30 of the output end connection of pfc circuit 20 is compressor M, voltage limit frequency device 100 includes obtaining
Module 101 and control module 102.
Wherein, acquisition module 101 is used to obtain the input voltage virtual value of pfc circuit 20, control module 102 and acquisition mould
Block 101 is connected, and control module 102 is used to be obtained according to input voltage virtual value, outdoor environment temperature and indoor environment temperature presses
The voltage limit frequency threshold value of contracting machine M, and run according to voltage limit frequency threshold value control compressor M limit frequencies.
In an embodiment of the present invention, control module 102 can by direct consulting method, sluggish interval inquiry mode or
Person's piece-wise linearization mode obtains the voltage limit frequency threshold value of compressor M.
According to one embodiment of present invention, when the voltage that compressor M is obtained by table look-at mode limits frequency threshold value,
Input voltage virtual value is divided into N number of gear by control module 102, and according to outdoor environment temperature and indoor environment temperature pair
Each voltage gear sets M voltage limit frequency threshold value, and the intermediate point of the corresponding input voltage virtual value of adjacent gear positions is made
To obtain the separation that voltage limits frequency threshold value, wherein, N and M is the positive integer more than 1.
According to another embodiment of the invention, when the voltage for obtaining compressor M by sluggish interval inquiry mode limits frequency
During threshold value, input voltage virtual value is divided into N number of gear by control module 102, and according to outdoor environment temperature and indoor ring
Border temperature sets M voltage limit frequency threshold value to each voltage gear, wherein, N and M is the positive integer more than 1, works as input voltage
When virtual value is in propradation, control module 102 makees the intermediate point of adjacent input voltage virtual value plus the first preset value
To obtain the separation that voltage limits frequency threshold value；When input voltage virtual value is in decline state, control module 102 will be adjacent defeated
The intermediate point for entering voltage effective value subtracts the first preset value as the separation for obtaining voltage limit frequency threshold value.
According to still another embodiment of the invention, when the voltage that compressor M is obtained by piece-wise linearization mode limits frequency threshold
During value, input voltage virtual value is divided into N number of gear by control module 102, and according to outdoor environment temperature and indoor environment
Temperature sets M voltage limit frequency threshold value to each voltage gear, and according to the corresponding input voltage virtual value line of adjacent gear positions
Property calculate voltage limit frequency threshold value, wherein, N and M is the positive integer more than 1.
It should be noted that in the voltage limit frequency device of the input voltage adapting of the pfc circuit of the embodiment of the present invention
The details not disclosed, is draped over one's shoulders in the voltage limit frequency method of the input voltage adapting that refer to the pfc circuit of the embodiment of the present invention
The details of dew, specifically repeats no more here.
The voltage limit frequency device of the input voltage adapting of pfc circuit according to embodiments of the present invention, by acquisition module
The input voltage virtual value of pfc circuit is obtained, control module is according to input voltage virtual value, outdoor environment temperature and indoor environment
Temperature obtains the voltage limit frequency threshold value of compressor, and controls the compressor limit frequency to run according to voltage limit frequency threshold value, so as to lead to
The regulation to compressor operating frequency is crossed to reach the temperature for reducing heater members in input circuit and the mesh for reducing input current
, improve the safety and reliability of system.
Additionally, embodiments of the invention also proposed a kind of household electrical appliance, its input voltage for including above-mentioned pfc circuit
The voltage limit frequency device of self adaptation.
The household electrical appliance of the embodiment of the present invention, limit frequency and fill by the voltage of the input voltage adapting of above-mentioned pfc circuit
Put, the temperature of heater members in reduction input circuit can be reached by the regulation to compressor operating frequency and is reduced defeated
Enter the purpose of electric current, improve the safety and reliability of system.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, must rather than the device or element for indicating or imply meaning
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " is meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or two interaction relationships of element, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height 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 to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combined in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (11)
1. a kind of voltage of input voltage adapting of PFC pfc circuit limits frequency method, it is characterised in that PFC electricity
The load of the output end connection on road is compressor, be the described method comprises the following steps：
Obtain the input voltage virtual value of the pfc circuit；
Frequency is limited according to the voltage that the input voltage virtual value, outdoor environment temperature and indoor environment temperature obtain the compressor
Threshold value；And
Limiting frequency threshold value according to the voltage controls the compressor limit frequency to run.
2. voltage as claimed in claim 1 limits frequency method, it is characterised in that by direct consulting method, sluggish interval query
Mode or piece-wise linearization mode obtain the voltage limit frequency threshold value of the compressor.
3. voltage as claimed in claim 2 limit frequency method, it is characterised in that when obtaining the compression by table look-at mode
During the voltage limit frequency threshold value of machine, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and indoor ring
Border temperature sets M voltage to each voltage gear and limits frequency threshold value, and by the corresponding input voltage virtual value of adjacent gear positions
Intermediate point limits the separation of frequency threshold value as the voltage is obtained, wherein, N and M is the positive integer more than 1.
4. voltage as claimed in claim 2 limits frequency method, it is characterised in that described in being obtained by sluggish interval inquiry mode
During the voltage limit frequency threshold value of compressor, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and room
Interior environment temperature sets M voltage limit frequency threshold value to each voltage gear, wherein, the N and M is the positive integer more than 1,
It is when the input voltage virtual value is in propradation, the intermediate point of adjacent input voltage virtual value is pre- plus first
If being worth as the separation for obtaining the voltage limit frequency threshold value；
When the input voltage virtual value is in decline state, the intermediate point of adjacent input voltage virtual value is subtracted first pre-
If being worth as the separation for obtaining the voltage limit frequency threshold value.
5. voltage as claimed in claim 2 limit frequency method, it is characterised in that when obtaining the pressure by piece-wise linearization mode
During the voltage limit frequency threshold value of contracting machine, input voltage virtual value is divided into N number of gear, and according to outdoor environment temperature and interior
Environment temperature sets M voltage limit frequency threshold value to each voltage gear, and effective according to the corresponding input voltage of adjacent gear positions
Value linearly calculates the voltage limit frequency threshold value, wherein, the N and M is the positive integer more than 1.
6. a kind of voltage of input voltage adapting of PFC pfc circuit limits frequency device, it is characterised in that PFC electricity
The load of the output end connection on road is compressor, and described device includes：
Acquisition module, the input voltage virtual value for obtaining the pfc circuit；
Control module, the control module is connected with the acquisition module, and the control module is used for according to the input voltage
Virtual value, outdoor environment temperature and indoor environment temperature obtain the voltage limit frequency threshold value of the compressor, and according to the voltage
Limit frequency threshold value controls the compressor limit frequency to run.
7. voltage as claimed in claim 6 limit frequency device, it is characterised in that the control module by direct consulting method,
Sluggish interval inquiry mode or piece-wise linearization mode obtain the voltage limit frequency threshold value of the compressor.
8. voltage as claimed in claim 7 limit frequency device, it is characterised in that when obtaining the compression by table look-at mode
During the voltage limit frequency threshold value of machine, input voltage virtual value is divided into N number of gear by the control module, and according to outdoor environment
Temperature and indoor environment temperature set M voltage to each voltage gear and limit frequency threshold value, and by the corresponding input of adjacent gear positions
The intermediate point of voltage effective value limits the separation of frequency threshold value as the voltage is obtained, wherein, N and M is just whole more than 1
Number.
9. voltage as claimed in claim 7 limits frequency device, it is characterised in that described in being obtained by sluggish interval inquiry mode
During the voltage limit frequency threshold value of compressor, input voltage virtual value is divided into N number of gear by the control module, and according to outdoor
Environment temperature and indoor environment temperature set M voltage limit frequency threshold value to each voltage gear, wherein, the N and M is and is more than
1 positive integer,
When the input voltage virtual value is in propradation, the control module is by the centre of adjacent input voltage virtual value
Point is plus the first preset value as the separation for obtaining the voltage limit frequency threshold value；
When the input voltage virtual value is in decline state, the control module is by the centre of adjacent input voltage virtual value
Point subtracts the first preset value as the separation for obtaining the voltage limit frequency threshold value.
10. voltage as claimed in claim 7 limits frequency device, it is characterised in that described in being obtained by piece-wise linearization mode
During the voltage limit frequency threshold value of compressor, input voltage virtual value is divided into N number of gear by the control module, and according to outdoor
Environment temperature and indoor environment temperature set M voltage limit frequency threshold value to each voltage gear, and according to adjacent gear positions correspondence
Input voltage virtual value linearly calculate voltage limit frequency threshold value, wherein, the N and M is the positive integer more than 1.
11. a kind of household electrical appliance, it is characterised in that including the PFC as any one of claim 5-10
The voltage limit frequency device of the input voltage adapting of pfc circuit.
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| CN201611062770.4A CN106787672A (en) | 2016-11-25 | 2016-11-25 | Voltage limit frequency method and the device of the input voltage adapting of pfc circuit |
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| CN201611062770.4A CN106787672A (en) | 2016-11-25 | 2016-11-25 | Voltage limit frequency method and the device of the input voltage adapting of pfc circuit |
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| CN109560712A (en) * | 2018-11-30 | 2019-04-02 | 广东美的制冷设备有限公司 | Air-conditioning system, frequency-variable controller and its alternating voltage evaluation method and device |
| CN109556258A (en) * | 2018-11-06 | 2019-04-02 | 广东美的暖通设备有限公司 | Air-conditioning system and its control method |
| CN111371307A (en) * | 2020-03-18 | 2020-07-03 | 青岛海尔空调器有限总公司 | Control method of PFC circuit in inverter air conditioner and inverter air conditioner |
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| CN111371307A (en) * | 2020-03-18 | 2020-07-03 | 青岛海尔空调器有限总公司 | Control method of PFC circuit in inverter air conditioner and inverter air conditioner |
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