CN108023474A - Pfc circuit, electric machine control system and transducer air conditioning - Google Patents
Pfc circuit, electric machine control system and transducer air conditioning Download PDFInfo
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- CN108023474A CN108023474A CN201810093504.0A CN201810093504A CN108023474A CN 108023474 A CN108023474 A CN 108023474A CN 201810093504 A CN201810093504 A CN 201810093504A CN 108023474 A CN108023474 A CN 108023474A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 41
- 230000005611 electricity Effects 0.000 claims description 15
- 230000001939 inductive effect Effects 0.000 claims description 13
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 235000013350 formula milk Nutrition 0.000 description 16
- 238000010586 diagram Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 8
- 230000002459 sustained effect Effects 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
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- 230000010354 integration Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
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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
-
- 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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
-
- 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
- H02P27/08—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 with pulse width modulation
- H02P27/085—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 with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
-
- 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)
- Rectifiers (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention provides a kind of pfc circuit, electric machine control system and transducer air conditioning, electric machine control system is by including reactor, rectification part, current detecting part, filter circuit, alternating voltage sampling unit, DC voltage sampling unit and calculation control unit composition, and rectification part including four rectifier diodes switch element that the rectification unit in parallel connected again and two switching tubes are connected two-by-two by being formed in parallel, full-wave rectifying circuit is formed with this, calculation control unit includes PFC calculation control units, by the DC bus-bar voltage set-point for obtaining motor operation, and according to AC-input voltage value, d-c bus voltage value, the switching tube work of AC input current value and DC bus-bar voltage set-point generation PFC duty cycle of switching signal driving rectification part, to carry out Active PFC to the alternating current of input.The relatively existing pfc circuit of the pfc circuit of the embodiment of the present invention can effectively improve efficiency, reduce common mode noise, and the reliability of whole electric machine control system is improved with this.
Description
Technical field
The present invention relates to convertible frequency air-conditioner technical field, more particularly to pfc circuit, electric machine control system and transducer air conditioning.
Background technology
In order to tackle household appliances power conservation requirement, convertible frequency air-conditioner is developed rapidly, and active power factor correction is
It is widely used in convertible frequency air-conditioner electric control part.The automatically controlled power factor correction portion of major part convertible frequency air-conditioner uses Boost at present
(boosting) type circuit, after electric current flows through rectifier bridge, supplies motor inverter, the electricity of this type after inductance and diode
It is that AC-DC (AC-DC) transfer efficiency is relatively low to control shortcoming；Or there is a kind of PFC (Active PFC) of no bridge mode
Circuit, although the pfc circuit of this no bridge mode improves AC-DC transfer efficiencies to a certain extent, but there are common-mode noise
The problem of big.
The above is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that the above is existing skill
Art.
The content of the invention
It is a primary object of the present invention to provide a kind of pfc circuit, electric machine control system and transducer air conditioning, it is therefore intended that
Solve the problems, such as that there are transfer efficiency is relatively low or common-mode noise is big in existing pfc circuit.
To achieve the above object, a kind of pfc circuit provided by the invention, the pfc circuit are applied to electric machine control system,
It is characterized in that, the pfc circuit includes reactor, rectification part, current detecting part, filter circuit, alternating voltage sampling unit, straight
Galvanic electricity presses sampling unit and calculation control unit；The reactor connects the input terminal of AC power with the current detecting part, described
Reactor, current detecting part and rectification part are connected in ac power supply circuit；The rectification part output terminal connects dc bus, institute
Filter circuit is stated to be connected with the rectification part by the dc bus；
The rectification part includes the first diode, the second diode, the 3rd diode, the 4th diode and carries afterflow two
The first switch pipe and second switch pipe of pole pipe, the public anode after the first diode and the second diodes in parallel connection,
And the common cathode after the 3rd diode and the connection of the 4th diodes in parallel is connected with the L lines of AC power；It is described
First switch pipe and second switch pipe series connection after points of common connection and AC power N lines connect, the first switch pipe and
Common cathode connection after one end is connected with first diode and the second diodes in parallel after the series connection of second switch pipe, it is described
Public affairs after the other end is connected with the 3rd diode and the 4th diodes in parallel after first switch pipe and the series connection of second switch pipe
Common-anode connects, and the control terminal of the first switch pipe and second switch pipe connects the calculation control unit respectively；Wherein,
The current detecting part is used to detect the AC input current, and obtains corresponding AC input current value；Institute
Filter circuit is stated to be used to carry out smothing filtering to the direct current of rectification module output to export DC bus-bar voltage；The friendship
Galvanic electricity pressure sampling unit is used to detect AC-input voltage, and obtains corresponding AC-input voltage value；The DC voltage sampling
Portion is used to detect the DC bus-bar voltage, and obtains corresponding d-c bus voltage value；
The calculation control unit includes PFC calculation control units, and the PFC calculation control units are used to obtain the straight of motor operation
Busbar voltage set-point is flowed, and according to the AC-input voltage value, the d-c bus voltage value, the AC input current
Value and DC bus-bar voltage set-point generation PFC duty cycle of switching signal drive the switching tube work of the rectification part,
To carry out Active PFC to the alternating current of the input.
Preferably, when the current detecting part detects the AC input current, in the first switch pipe or described
The intermediate time that second switch pipe is turned on or off carries out current sample.
Preferably, the electric machine control system includes phase current sampling portion and inverter；
The phase current sampling portion is used to sample the phase current signal of the motor and is input to the motor operation control
Portion；
The inverter input terminal connects the dc bus, and the inverter output end connects motor；
The calculation control unit further includes motor calculation control unit, and the motor calculation control unit is used for according to the direct current
The rotating speed of target value of bus voltage value, the phase current signal of the motor and the motor calculates generation pulse width signal,
The calculation control unit also generates triangle carrier signal, and is generated according to the triangle carrier signal and the pulse width signal
Pwm control signal is to the inverter, to drive the motor operation.
Preferably, the motor calculation control unit includes：
Location/velocity estimation module, for being estimated the rotor-position of motor to estimate with the rotor angle for obtaining motor
Evaluation and motor speed estimate；
Q axis gives current value computing module, for calculating Q axis according to motor rotating speed of target value, motor speed estimate and giving
Constant current value；
D axis gives current value computing module, for the maximum output voltage and the output voltage of inverter according to inverter
Amplitude calculates D axis and gives current value；
Current control module, for giving current value according to the Q axis, the D axis gives current value, the motor speed
Estimate, the d-c bus voltage value and the phase current values to motor sampling, which calculate, generates the pulse width letter
Number, and the pwm control signal is generated to the inverter according to the triangle carrier signal and the pulse width signal, with
Drive the motor operation.
Preferably, the D axis gives current value computing module and includes：
Weak magnetic controller, for the maximum output voltage to the inverter and the inverter output voltage amplitude into
Row is calculated gives current value initial value to obtain D axis；
Clipping unit, electricity is given for giving current value initial value progress amplitude limiting processing to the D axis to obtain the D axis
Flow valuve.
Preferably, the current control module further includes：
Q shaft currents value and D shaft current value computing units, for according to the phase current values and angle estimation value progress
The Q shaft currents value and the D shaft currents value is calculated.
Preferably, the current control module is additionally operable to：
The phase current values of motor operation are obtained, and transfer the first phase current values to prestore and the second phase current values difference
Corresponding first Q axle inductances, the 2nd Q axle inductances value and the first D axle inductances, the 2nd D axle inductance values, according to the phase current values
And first phase current values and second phase current values, the first Q axle inductances, the 2nd Q axle inductances value and
The first D axle inductances, the 2nd D axle inductances value calculate Q axle inductances and D axle inductance values.
Preferably, the PFC calculation control units include weak magnetic critical voltage computing module, AC voltage parameter determines mould
Block, weak magnetic critical voltage value clipping module, inductor current value computing module, PFC switching signal duty cycle computing modules and open
OFF signal generation module；Wherein
The weak magnetic critical voltage value computing module, for according to the Q axis given voltage value, the D axis given voltage
Weak magnetic critical voltage value during motor operation is calculated in value and index of modulation Kmax；
The AC voltage parameter determining module, for the AC-input voltage value gathered according to alternating voltage sampling unit,
Carrying out calculating, to respectively obtain AC-input voltage polarity mark signal, AC-input voltage virtual value, AC-input voltage absolute
Value and zero passage detection signal；
The weak magnetic critical voltage value clipping module is described straight for being obtained to weak magnetic critical voltage value progress amplitude limit
Flow busbar voltage set-point；
The inductive current set-point computing module, for female according to the DC bus-bar voltage set-point and the direct current
Line voltage value carries out that the inductive current set-point is calculated；
The inductor current value computing module, for according to the AC input current value and AC-input voltage polarity mark
Show that the inductor current value is calculated in signal；
The PFC switching signals duty cycle computing module, for according to the inductive current set-point and inductance electricity
The PFC switching signals duty cycle signals are calculated in flow valuve；
The switching signal generation module, for according to the PFC switching signals duty cycle signals, AC-input voltage pole
Switching signal is calculated to control the first switch pipe or described in property beacon signal and alternating voltage zero-crossing signal
Two switching tube switchs.
To achieve the above object, the present invention also provides a kind of electric machine control system, including the pfc circuit.
To achieve the above object, the present invention also provides a kind of transducer air conditioning, including the electric machine control system.
Pfc circuit provided by the invention applied to electric machine control system, by including reactor, rectification part, current detecting
Portion, filter circuit, alternating voltage sampling unit, DC voltage sampling unit and calculation control unit composition, and rectification part is by including four
The rectification unit in parallel connected again and the switch element of two switching tube series connection are formed in parallel rectifier diode two-by-two, are formed with this
Full-wave rectifying circuit, calculation control unit include PFC calculation control units, are given by the DC bus-bar voltage for obtaining motor operation
Value, and given birth to according to AC-input voltage value, d-c bus voltage value, AC input current value and DC bus-bar voltage set-point
Into the switching tube work of PFC duty cycle of switching signal driving rectification part, to carry out Active PFC to the alternating current of input.This
The relatively existing pfc circuit of the pfc circuit of inventive embodiments can effectively improve efficiency, reduce common mode noise, be improved with this whole
The reliability of a electric machine control system.
Brief description of the drawings
Fig. 1 is the electrical block diagram of pfc circuit first embodiment of the present invention；
Fig. 2 is another electrical block diagram of pfc circuit first embodiment of the present invention；
Fig. 3 is current loop schematic diagram of the electric current from the reactors of L lines in energy storage in first embodiment；
Current loop schematic diagrames to electrolytic capacitor charging of the Fig. 4 for electric current in first embodiment from L lines；
Fig. 5 is current loop schematic diagram of the electric current from the reactors of N lines in energy storage in first embodiment；
Current loop schematic diagrames to electrolytic capacitor charging of the Fig. 6 for electric current in first embodiment from N lines；
Fig. 7 is the sine wave modulation waveform diagram of the pwm signal of the control inverter in first embodiment；
Fig. 8 is the pwm signal and the correspondence of isosceles triangle carrier signal of the control inverter in first embodiment
Schematic diagram；
Fig. 9 is the 51 output pwm signal waveform of PFC calculation control units and alternating current of pfc circuit second embodiment of the present invention
Flow waveform diagram；
Figure 10 is the motor calculation control unit high-level schematic functional block diagram of pfc circuit 3rd embodiment of the present invention；
Figure 11 be motor D axle inductances and Q axle inductances with electric current change curve；
Figure 12 is the PFC calculation control unit high-level schematic functional block diagrams of pfc circuit fourth embodiment of the present invention.
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to Fig. 1, Fig. 1 is the pfc circuit structure diagram that first embodiment of the invention provides, for convenience of description, only
Show with the relevant part of the embodiment of the present invention, details are as follows：
The PFC of the embodiment of the present invention is applied to electric machine control system, including reactor L, rectification part 4, current detecting part 3,
Filter circuit 7, alternating voltage sampling unit 2, DC voltage sampling unit 6 and calculation control unit 5；Wherein
Reactor L and current detecting part 3 connect the input terminal of AC power 1, reactor L, current detecting part 3 and rectification part
4 are connected in ac power supply circuit, and current detecting part 3 is used to detect AC input current value Iac, and current detecting part 3 can here
Based on the current sampling circuit of series resistance type, then the output of the difference channel by being connected with resistance both ends, such sampling electricity
Road belongs to the prior art, and details are not described herein.
4 output terminal of rectification part connects dc bus, and filter circuit 7 is connected by dc bus with rectification part 4；Filter circuit
7 are used to carry out smothing filterings to the direct current of rectification module output to export DC bus-bar voltage, in figure filter circuit 7 mainly by
Electrolytic capacitor EC is formed.
Alternating voltage sampling unit 2 and DC voltage sampling unit 6 are respectively used to Sample AC input voltage value Uac and direct current is female
Line voltage value Udc, DC voltage sampling unit 6 can be based on being gone here and there in figure by the first divider resistance R4 and the second divider resistance R5 here
Join the simple pressure sampling circuit formed, the circuit of alternating voltage sampling unit 2 can be identical with DC voltage sampling unit 6, also may be used
With the voltage sampling circuit based on other existing voltage sampling circuits such as transformer device structure type.
Calculation control unit 5 includes PFC calculation control units 51, and PFC calculation control units 51 are used for the direct current for obtaining motor operation
Busbar voltage set-point Udref, and according to AC-input voltage value Uac, d-c bus voltage value Udc, AC input current value
The switching tube work of Iac and DC bus-bar voltage set-point Udref generation PFC duty cycle of switching signal driving rectification parts 4, with
Active PFC is carried out to the alternating current of input.
Specifically, rectification part 4 includes the first rectification unit 41 and second switch unit 42, the first rectification unit 41 includes two
Two the first diode D1 and the second diode D2 and the 3rd diode D3 and the 4th diode D4 in parallel being composed in series again, the
Two switch elements 42 include the first switch pipe S7 and second switch pipe S8 that carry fly-wheel diode of series connection, the first rectification unit
41 and second switch unit 42 it is in parallel, the control terminal difference concatenation operation control unit 5 of first switch pipe S7 and second switch pipe S8,
The common contact and first switch pipe S7 of first diode D1 and the second diode D3 and the common contact difference of second switch pipe S8
The L lines and N lines of AC power are connected, ac power supply circuit is formed with this.
The first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 can be commonly low in figure
Fast rectifier diode, first switch pipe S7 and second switch pipe S8 are metal-oxide-semiconductor (Metal Oxid Semiconductor, metal
Oxide semiconductor), naturally it is also possible to it is other kinds of power tube such as IGBT pipes (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor)；
First diode D1 and the second diode D2 be connected in parallel after public anode, and the 3rd diode D3 and the 4th
Common cathode after diode D4 is connected in parallel is connected with the L lines of AC power；First switch pipe S7 and second switch pipe S8
Points of common connection and AC power after series connection N lines connection, first switch pipe S7 and second switch pipe S8 series connection after one end with
Common cathode after first diode D1 and the second diode D2 is connected in parallel connects, first switch pipe S7 and second switch pipe S8
Public anode after the other end is connected in parallel with the 3rd diode D3 and the 4th diode D4 after series connection is connected, first switch pipe S7
With the control terminal difference concatenation operation control unit 5 of second switch pipe S8；
The anode and cathode of sustained diode 5 connect the D poles and S poles of first switch pipe S7 respectively, and sustained diode 6 collects
Into inside first switch pipe S7, the anode and cathode of sustained diode 6 connect the D poles and S poles of second switch pipe S8 respectively,
Sustained diode 6 is integrated in inside second switch pipe S8.In the rectification circuit for needing high current to work, its needs is matched
Rectifier diode model is likely difficult to be adapted to, or selectable model causes price to raise less, and samples group in parallel two-by-two
Closing can cause the electric current of single diode only to need the half of matching current, therefore relatively easy adaptation is much, and can also
Cost is reduced, as rectification circuit needs the current requirements of 30A, and the specification of 30A is difficult to be adapted to for single rectifier diode
Obtain, or cost is also higher, and the rectifier diode for sampling single 20A is just easy to be adapted to, and even if two in parallel
Cost is also more much lower than single, therefore circuit cost can be greatly reduced in the combining form of above-mentioned parallel connection two-by-two.
Thus, first rectification unit 41 of the present embodiment is by the first diode D1 and second in parallel being composed in series again two-by-two
Diode D2 and the 3rd diode D3 and the 4th diode D4 compositions, with respect to the rectification circuit of two Diode series, secondly
Pole pipe model is easily adapted to, and can effectively reduce the cost of whole circuit.
Above-mentioned current detecting part 3 is connected on the N line sides of AC power in Fig. 1, can also be connected on the L of alternating voltage
Line side, as shown in Fig. 2, the function of its detection AC input current value Iac is identical with Fig. 1.
Pfc circuit operation principle shown in the present embodiment is as follows：It is made of entirely reactor L, rectification part 4 and electrolytic capacitor EC
Ripple current rectifying and wave filtering circuit, as shown in figure 3, when PFC calculation control units 51 control first switch pipe S7 conductings, second switch pipe S8
During cut-off, at this time AC power electric current from firewire, that is, L lines through the first diode D1 and the second diode D2, first switch pipe
The S poles and D poles of S7, reactor L and current detecting part 3 return to AC power zero curve i.e. N lines and form circuit, realize to reactor L
Energy storage；When PFC calculation control units 51 control first switch pipe S7 cut-offs, as shown in figure 4, producing induced electricity on reactor L
Kinetic potential, the electric current that its electromotive force produces flow through the current direction of reactor L with being consistent before first switch pipe S7 cut-offs, at this time
The electric current that the induced electromotive force of reactor L produces is through the first diode D1 and the second diode D2, electrolytic capacitor EC, second switch
Sustained diode 6, reactor L and the current detecting part 3 of pipe S8 returns to AC power zero curve i.e. N lines and forms circuit with to electrolysis
Capacitance EC charges, with this realize AC power electric current from L line starting directions when slave rectification part 4 input alternating voltage
With phasing, that is, Active PFC of alternating current.
And when when PFC calculation control units 51 control first switch pipe S7 cut-offs, second switch pipe S8 conductings, such as Fig. 5 institutes
Show, at this time AC power electric current from zero curve, that is, N lines through current detecting part 3, reactor L, the S poles of second switch pipe S8 and D
Pole, the 3rd diode D3 and the 4th diode D4 return to AC power firewire i.e. L lines and form circuit, realize the storage to reactor L
Energy；When PFC calculation control units 51 control second switch pipe S8 cut-offs, as shown in fig. 6, induced electromotive force is produced on reactor L,
The electric current that its electromotive force produces flows through the current direction of reactor L with being consistent before second switch pipe S8 cut-offs, reactance at this time
Sustained diode 5 of the electric current through first switch pipe S7 of the induced electromotive force generation of device L, electrolytic capacitor EC, the 3rd diode D3
AC power firewire i.e. L lines are returned to the 4th diode D4 and form circuit to charge to electrolytic capacitor EC, are realized with this
AC power electric current from N line starting directions when slave rectification part 4 input alternating voltage and alternating current phasing, that is, work(
Rate factor correction.
Therefore, PFC calculation control units 51 are respectively by controlling the alternate conduction of first switch pipe S7 and second switch pipe S8
And cut-off, realize the Active PFC function under full-wave rectification pattern.
Further, the electric machine control system cited in the pfc circuit of the embodiment of the present invention, further includes phase current sampling portion
9, phase current sampling portion 9 is used for the phase current signal for detecting motor 10, and obtains corresponding phase current values, is input to motor computing
Control unit 5, such as phase current signal Iu, Iv, Iw in Fig. 1, the current sample that current sample portion 9 can be based on three resistance and single electron
Scheme is realized, belongs to the prior art, details are not described herein.
8 input terminal of inverter connects dc bus, is the DC power supply described in inverter 8 provides work as rectification busbar,
8 output terminal of inverter connects motor 10, and calculation control unit 5 further includes motor calculation control unit 52, and motor calculation control unit 52 is used
Counted according to the rotating speed of target value ω ref of d-c bus voltage value Udc, phase current signal Iu, Iv, Iw of motor and motor 10
Generation pulse width signal is calculated, calculation control unit 5 also generates triangle carrier signal, and according to triangle carrier signal and pulse width
Signal generation pwm control signal is to inverter 8, to drive motor 10 to run.
Specifically, motor calculation control unit 52 passes through at the same time according to phase current signal Iu, Iv, Iw of the motor 10 of sampling
The rotating speed of target value ω ref of d-c bus voltage value Udc and motor 10 are further obtained, by calculating, finally export six tunnels
Pwm control signal is to inverter 8, its pwm control signal is macroscopically being based on sine wave modulation principle, as shown in fig. 7, passing through
Lumbar triangle carrier wave S2 is modulated the pwm control signal waveform such as S1 finally obtained wherein all the way using sine voltage signal S3
Shown, the cycle T of its PWM is traditionally arranged to be 100us-250us, motor 10 is driven finally by inverter 8, due to machine winding
Inductance characteristic, finally on three windings of motor 10 formed sinusoidal waveform as shown in the dotted portion waveform S4 in Fig. 7.
Since the frequency of PWM is very high, carries out pulsewidth calculating in motor calculation control unit 52 and ultimately produce pwm control signal
When, it is actually based on the Principle of Space Voltage Vector PWM (SVPWM) realization, i.e., is believed by calculating the pulse width of generation
Number, and continuous triangle carrier signal is produced by timer inside motor calculation control unit 52, and by above-mentioned pulse width
Mode final output pwm control signal of the signal compared with triangle carrier signal, its pwm control signal share six tunnels, point
Not Kong Zhi inverter 8 the work of six switching tubes of S1-S6, last inverter 8 exports three-phase driving signal to the realization pair of motor 10
The driving operation of motor 10.
As shown in figure 8, the triangle carrier signal waveform diagram that the timer inside motor calculation control unit 52 produces is such as
Shown in S6, as shown in Du1, Du2, Du3 in figure, its actual Software Create pwm control signal waveform is its pulse width signal
This pulse width signal is sent into comparand register, being based on triangular carrier S6 finally by timer can generate wherein all the way
For pwm control signal as shown in S5, each of which the triangular carrier cycle corresponds to one of pwm control signal cycle.Wherein S6
For triangle carrier signal in each triangle be isosceles triangle, the wave crest of each of which isosceles triangle with this isosceles three
The intermediate time of the effective pulse width of pwm control signal in angular carrier cycle is identical, such as first isoceles triangle in figure
The wave crest of shape corresponds to the midpoint b moment position at the a-c moment in effective pulse width, that is, figure of first pwm pulse waveform.It is logical
Cross different pulse width signals and ultimately generate the different pwm control signal of different effective pulse widths.This PWM of wherein six roads
Control signal be added to six switching tubes of inverter 8 and finally constituted when controlling motor 10 three 120 ° of space phase mutual deviations to
Amount, finally synthesizes the voltage vector signal changed over time, and this voltage vector signal amplitude is constant, identical according to sine wave
Frequency rotates so that motor 10 realizes operating under the control of this voltage vector signal.
The pfc circuit applied to electric machine control system of the embodiment of the present invention, by including reactor L, rectification part 4, electric current
Test section 3, filter circuit 7, alternating voltage sampling unit 2, DC voltage sampling unit 6 and calculation control unit 5 form, and rectification part 4
By including the rectification unit that four rectifier diodes in parallel connected again form two-by-two and the switch element of two switching tube series connection
It is formed in parallel, full-wave rectifying circuit is formed with this, calculation control unit includes PFC calculation control units 51, by obtaining motor operation
DC bus-bar voltage set-point Udref, and according to AC-input voltage value Uac, d-c bus voltage value Udc, exchange input
The switching tube of current value Iac and DC bus-bar voltage set-point Udref generation PFC duty cycle of switching signal driving rectification parts 4
Work, to carry out Active PFC to the alternating current of input.The relatively existing pfc circuit of the pfc circuit of the embodiment of the present invention
Efficiency can effectively be improved, reduce common mode noise, the reliability of whole electric machine control system is improved with this.
Further, the second embodiment as pfc circuit provided by the invention, the of the pfc circuit based on the present invention
One embodiment, in the present embodiment, current detecting part 3 are used to gather the current value I by reactorL, and in first switch pipe
The intermediate time that S7 or second switch pipe S8 are turned on or off carries out current sample.
Pwm signal waveform such as S7 control first switch pipe S7 that PFC calculation control units 51 as shown in Figure 9 export or the
The on off state of two switching tube S8 switches over, with control pfc circuit carry out Active PFC when, its current detecting part 3 is right
The collection of alternating current Iac is control first switch pipe S7 or second switch pipe S8 in a pwm control signal cycle
The t1 moment in the intermediate time such as figure of T1 periods in the period figure of unlatching is sampled, or the time in closing
The t2 moment in the intermediate time such as figure of T2 periods in section figure is sampled, due to first switch pipe S7 or second switch
When the on off state of pipe S8 switches over, its reactor L can carry out the conversion of energy storage and release, during above-mentioned switching tube is opened
Reactor L energy storage, its alternating current Iac increases, and the induced electromotive force pair produced in above-mentioned switching tube down periods reactor L
The electrolytic capacitor electric discharge of filtering is released, its alternating current Iac reduces, it is followed out by the alternating current Iac of reactor L
The waveform diagram of the PWM of pipe is closed as shown in the S8 in figure, in t1 devices its electric current increase that switching tube is opened, and in switching tube
Its electric current reduces during the t2 of closing, therefore selects a suitable current sample point important, and sampling otherwise can be brought to miss
The problem of difference is big, tests determined, the electric current that the intermediate time during above-mentioned be turned on or off samples is than calibrated
True representative alternating current each PWM cycle actual current value, such as I in figureL_ sample is the electric current that actual samples obtain
Value, the average value that its size changes close to Iac in the pwm control signal device of whole switching tube, in this, as passing through reactance
The current value I of deviceL, therefore ensure that the accuracy of sampled current value, hereby it is ensured that 51 controlling switch plumber of FC calculation control units
It is accurate to make, the accuracy for the offer Active PFC for being.
Further, the 3rd embodiment as pfc circuit provided by the invention, the of the pfc circuit based on the present invention
One embodiment, as shown in Figure 10, the motor calculation control unit 52 of the electric machine control system of the present embodiment further include：
Location/velocity estimation module 521, for being estimated the rotor-position of motor to obtain the rotor angle of motor 10
Spend estimated values theta est and motor speed estimate ω est；
Q axis gives current value Iqref computing modules 522, for being estimated according to motor rotating speed of target value ω ref, motor speed
Evaluation ω est calculate Q axis and give current value Iqref；
D axis gives current value Idref computing modules 523, for according to the maximum output voltage Vmax of inverter and inversion
The output voltage amplitude V1 of device calculates D axis and gives current value Idref；
Current control module 524, current value Idref, motor speed are given for giving current value Iqref, D axis according to Q axis
Degree estimate ω est, d-c bus voltage value Udc and phase current values Iu, Iv, Iw for being sampled to motor 10 are calculated
Pulse width signal, and pwm control signal is generated to inverter 8 according to above-mentioned triangle carrier signal and pulse width signal, with
The motor 10 is driven to run
Specifically, the motor 10 in the embodiment of the present invention can be the motor of position-sensor-free, location/velocity estimation module
When the rotor angle estimated values theta est and motor speed estimate ω est of 521 definite motors 10, it can be realized by flux observation method
Above-mentioned function, specifically, first can be according to the voltage V in two-phase rest frameα、VβWith electric current Iα、IβIt is electromechanical to calculate compression
The estimate of machine useful flux on two-phase rest frame α and β direction of principal axis, calculates as follows with specific reference to the following formula (1)：
Wherein,WithThe respectively estimate of motor useful flux on α and β direction of principal axis, VαAnd VβRespectively α and β axis
Voltage on direction, IαAnd IβElectric current respectively on α and β direction of principal axis, R are stator resistance, LqFor the q axle inductance parameters of motor.
Then, the rotor angle estimated values theta est and motor actual speed of compressor electric motor are calculated according to following formula (2)
Value value ω est：
Wherein, Kp_pllAnd Ki_pllRespectively proportional integration parameter, θerrFor misalignment angle estimate, ωfFor speed low pass filtered
The bandwidth of ripple device.
Specifically, Q axis, which gives current value computing module 522, includes superpositing unit and pi regulator.Wherein, superpositing unit is used
Calculated in the difference of motor rotating speed of target value ω ref and motor speed estimate ω est, pi regulator is used for according to above-mentioned folded
Add motor rotating speed of target value ω ref that unit exports and motor speed estimate ω est difference carry out PI adjust with export Q axis to
Constant current value Iqref.
Specifically, D axis, which gives current value computing module 523, includes weak magnetic controller and clipping unit, wherein, weak magnetic control
Device be used to calculating with the output voltage amplitude V1 of inverter 8 the maximum output voltage Vmax of inverter 8 with obtain D axis to
Constant current value initial value Id0, clipping unit be used for D axis is given current value initial value Id0 carry out amplitude limiting processing with obtain D axis to
Constant current value Idref.
In an embodiment of the present invention, weak magnetic controller can calculate D axis according to the following formula (3) and give current value initial value
Id0：
Wherein, Id0Current value initial value, K are given for D axisiFor integral control coefficient, V1
For the output voltage amplitude of inverter, vdFor D shaft voltages, vqFor Q shaft voltages, VmaxFor the maximum output voltage of inverter 8, Vdc
The DC bus-bar voltage exported for rectifier 4.
In an embodiment of the present invention, clipping unit obtains D axis according to the following formula (4) and gives current value：
Wherein, Idref gives current value, I for D axisdemagFor motor demagnetization current limits value.
Specifically, the specific calculating of current control module 524 is as follows：
U, V, W three-phase electricity flow valuve Iu, Iv, Iw are obtained according to being sampled to motor 10, and passes through the static seat of three phase static-two-phase
Mark converting unit and carry out Clark conversion, based on following formula (5), obtain motor on two-phase rest frame α and β direction of principal axis
Electric current IαAnd Iβ
Iα=Iu
Further according to rotor angle estimated values thetaestPass through static-two cordic phase rotators converting unit of two-phase to carry out
Park is converted, and actual current value Iq, Id of D axis and Q axis under two-phase rotating coordinate system is calculated by following formula (6).
Id=Iαcosθest+Iβsinθest
Iq=-Iαsinθest+Iβcosθest (6)
Q shaft currents value and D shaft current value meters in current control module 524 are realized above by formula (5) and formula (6)
Calculate calculating of the unit to actual current value Iq, Id of D axis and Q axis.
Further, current control module 524 can calculate Q axis given voltage values according to the following formula (7) and D axis gives electricity
Pressure value：
Wherein, Vq is Q axis given voltage values, and Vd is D axis given voltage values, and Iqref is that Q axis gives current value, Idref is
D axis gives current value, and Iq is Q shaft currents, and Id is D shaft currents, and Kpd and Kid are respectively the control proportional gain of D shaft currents and integration
Gain, Kpq and Kiq are respectively the control proportional gain of Q shaft currents and storage gain, and ω is motor speed, and Ke is anti-electric for motor 10
Gesture coefficient, Ld and Lq are respectively D axis and Q axle inductances, the two parameters can be provided by motor manufacturer, specifically can be according to motor
The motor D axis and Q axis that manufacturer provides with taking rated value therein in the change curve of electric current,Table
Show the integrations of x (τ) in time.
Further, in order to further accurately obtain D axle inductance Ld and Q axle inductance Lq, its current control module 524 is also
For：The phase current values of motor operation are obtained, and transfer the first phase current values to prestore and the second phase current values are corresponding
First Q axle inductances, the 2nd Q axle inductances value and the first D axle inductances, the 2nd D axle inductance values, according to phase current values and the first phase
Current value and the second phase current values, the first Q axle inductances, the 2nd Q axle inductances value and the first D axle inductances, the 2nd D axle inductance value meters
Calculate Q axle inductances and D axle inductance values.Specifically, phase current signal Iu, Iv of the motor 10 gathered by obtaining current sample portion 9,
Iw, wherein these three phase current sizes are identical, only need to use one of them.The motor D axis electricity that motor manufacturer provides
Sense and Q axle inductances are as shown in figure 11 with the change curve of electric current, and wherein i is winding current, that is, phase current values of motor, at this time
Can be prestored by above-mentioned curve map the first phase current values i1 and corresponding first Q axle inductance values Lq1 of the second phase current values i2,
2nd Q axle inductance value Lq2 and the first D axle inductance values Ld1, the 2nd D axle inductance value Ld2, and i pairs of currently detected phase current
The D axle inductance value Ld and Q axle inductance values Lq answered can be calculated according to following mathematic interpolation formula：
Ld=Ld1+ (Ld2-Ld1) * (i-i1)/(i2-i1)
Lq=Lq1+ (Lq2-Lq1) * (i-i1)/(i2-i1)
Pass through corresponding D axle inductances Ld and Q the axis electricity of the phase current of the relatively accurate really settled front motor 10 of above-mentioned formula energy
Feel Lq values.
, can be according to angle of rotor of motor estimate after Q axis given voltage value Vq and D axis given voltage values Vd is got
θest- two-phase static coordinate converting unit progress Park inverse transformations are rotated by two-phase to Vq and Vd, are fixed on coordinate system
Magnitude of voltage V α and V β, specific transformation for mula (8) are as follows：
Wherein, θ is 10 rotor angle of motor, can use above-mentioned rotor angle estimated values theta est herein.
Further, can according to magnitude of voltage V α and the V β that fixed coordinates are fastened by two-phase it is static-three phase static coordinate turns
Change unit and carry out Clark inverse transformations, obtain three-phase voltage Vu, Vv and Vw, specific transformation for mula (9) is as follows：
Vu=Vα
Then duty cycle computing unit can carry out duty cycle according to DC bus-bar voltage Udc and three-phase voltage Vu, Vv and Vw
Calculate, obtain duty cycle control signal, i.e. three-phase duty cycle Du, Dv and Dw, specific formula for calculation (10) is as follows：
Du=(Vu+0.5Vdc)/Vdc
Dv=(Vv+0.5Vdc)/Vdc
Dw=(Vw+0.5Vdc)/Vdc (10)
Wherein, Udc is DC bus-bar voltage.
Here three-phase duty cycle signals contain three road pulse width signals, such as a wherein phase duty cycle Du in Fig. 8
In corresponding Du1, Du2, Du3 duty cycle signals at different moments, finally produced again by the timer inside calculation control unit
Triangle carrier signal generates corresponding three road pwm control signal to the upper bridge arm three-way switch pipe of inverter 8, and the three of lower bridge arm
Three road pwm control signals of road control signal and corresponding complementary therewith, therefore three-phase duty cycle signals here are actual contains
Six road pwm control signals, finally according to the corresponding six roads pwm control signal of three-phase duty cycle Du, Dv, Dw to the six of inverter 4
Way switch pipe is controlled, to realize that the driving to motor 10 is run.
Further, the fourth embodiment as pfc circuit provided by the invention, the of the pfc circuit based on the present invention
Three embodiments, as shown in figure 12, in the present embodiment, PFC calculation control units 51 include weak magnetic critical voltage Us computing modules
511st, AC voltage parameter determining module 512, weak magnetic critical voltage value Us clipping modules 513, inductor current value ILComputing module
516th, PFC switching signals duty cycle computing module 515 and switching signal generation module 517；
Weak magnetic critical voltage value Us computing modules 511, for Q axis given voltage value Vq, D axis given voltage value Vd and tune
Weak magnetic critical voltage value Us during motor operation is calculated in COEFFICIENT K max processed.
AC voltage parameter determining module 512, for the AC-input voltage value gathered according to alternating voltage sampling unit 2
Uac, carries out calculating and respectively obtains AC-input voltage polarity mark signal, AC-input voltage virtual value Urms, exchange input
Absolute value of voltage | Uac | and zero passage detection signal, since AC-input voltage value Uac is the magnitude of voltage that sine wave changes,
It is not difficult to obtain above-mentioned parameter value by analyzing and calculating its real-time magnitude of voltage in a sine wave period.
Weak magnetic critical voltage value Us clipping modules 513, direct current mother is obtained for carrying out amplitude limit to weak magnetic critical voltage value Us
Line voltage set-point Udref.
Inductive current set-point ILrefComputing module 514, for female according to DC bus-bar voltage set-point Udref and direct current
Line voltage value Udc carries out that inductive current set-point I is calculatedLref；
Inductor current value ILComputing module 516, for according to AC input current value Iac and AC-input voltage polarity mark
Know signal and inductor current value I is calculatedL；
PFC switching signal duty cycles computing module 515, for according to inductive current set-point ILrefWith inductor current value IL
PFC switching signal duty cycle signals are calculated；
Switching signal generation module 517, for according to PFC switching signals duty cycle signals, AC-input voltage polarity mark
Know signal and switching signal is calculated to control first switch pipe S7 or second switch pipe S8 in alternating voltage zero-crossing signal
Switch.
Specifically, weak magnetic critical voltage value Us clipping modules 513 are calculated based on following equation (11)：
Wherein Vd is D axis given voltage values, and Vq is Q axis given voltage values, the two parameters are in above-mentioned 3rd embodiment
The current control module 524 of motor calculation control unit 52 be calculated based on formula (7), Kmax is the index of modulation, i.e. inversion
The ratio between device maximum output voltage and busbar voltage.If considering the situation of linear modulation,
Further, weak magnetic critical voltage value Us is passed through amplitude limit [U by weak magnetic critical voltage value Us clipping modules 513dc_min,
Udc_max] after obtain the command value Udref of DC bus-bar voltage, wherein, Udc_minDetermined according to input voltage, usually take Udc_min
=Uac_max+U0,Uac_maxFor the maximum of alternating voltage, U0For constant, recommendation takes 5V-10V.Udc_maxIt is pressure-resistant according to system and protect
Certain surplus is stayed to determine, Udc_max=Urate-U1,UrateFor device pressure voltage, IPM modules are pressure-resistant desirable used in the present embodiment
For 500V, i.e. Urate=500V, U1To retain pressure-resistant surplus, recommend 50V-100V, U in the present embodiment1It can be taken as 100V.
Further, inductive current set-point ILrefInductive current set-point I is calculated in computing module 514LrefWhen, first
DC bus-bar voltage set-point Udref and d-c bus voltage value Udc are made the difference, and carry out PI controls, is multiplied by supply voltage
Absolute value | Uac |, multiplied by with the 1/U reciprocal of supply voltage virtual value square2Rms, obtains the command value I of inductive currentLref。
Further, inductor current value ILComputing module 516 calculates inductor current value ILWhen, pass through AC input current value
Inductor current value I is calculated in Iac and AC-input voltage polarity mark signalL, AC input current value Iac is the side of having here
To current value, and directioin parameter need not be used when actual participation calculates, it is therefore desirable to introduce AC-input voltage polarity
Id signal, i.e., only take the sizes values of alternating current therein when AC-input voltage is in negative semiaxis, remove directioin parameter, just
Semiaxis, which can connect, directly takes AC current values so as to finally obtain the inductor current value I by reactor LL, its current waveform is final
As shown in the S8 waveforms of Fig. 9 in embodiment.
Further, when PFC switching signal duty cycle signals are calculated in PFC switching signals duty cycle computing module 515,
According to inductive current set-point ILrefWith the actual value I of inductive currentLMake the difference, and carry out PI controls and obtain PFC switching signal duties
Compare D.
Further, switching signal generation module 517 finally exchanges input electricity according to PFC switching signal duty cycle signals D
Polarity mark signal and alternating voltage zero-crossing signal is pressed finally to determine output to first switch pipe S7 or second switch pipe S8
The pwm control signal of switch, to control pfc circuit to work.
The PFC calculation control units 51 of the present embodiment during the switching signal of generation controlling switch pipe work is calculated, by
Run in introducing motor calculation control unit 51 in the pwm control signal for calculating generation control inverter with finally obtaining motor 10
Relevant parameter such as Q axis given voltage value Vq and D axis given voltage value Vd with obtain weak magnetic control parameter value, therefore its transport
Control process introduces the real-time parameter during motor 10 controls so that the control of pfc circuit can monitor motor 10 in real time
Loading condition and change, therefore control it is more accurate.
The present invention also provides a kind of electric machine control system, its electric machine control system can be used for driving permanent magnet synchronous motor fortune
OK, can be applicable on the home appliance of the sampling permanent magnet synchronous motor work such as air conditioner or washing machine, motor control of the invention
System processed includes the pfc circuit of the embodiments of the present invention, can effectively improve the reliability of whole electric machine control system.
The present invention also provides a kind of transducer air conditioning, transducer air conditioning includes indoor unit part and outdoor machine part, wherein
Outdoor controller and/or indoor machine controller may include the electric machine control system described in the embodiment of the present invention, with control room
Inner blower either outdoor fan or outdoor compressor operation, can effectively lift the reliability of whole transducer air conditioning.
In the description of this specification, the description meaning of reference term " first embodiment ", " second embodiment ", " example " etc.
Refer to reference to specific method, device or the feature that the embodiment or example describe be contained at least one embodiment of the present invention or
In example.In the present specification, a schematic expression of the above terms does not necessarily refer to the same embodiment or example.And
And specific features, method, apparatus or the feature of description can be in any one or more of the embodiments or examples with suitable sides
Formula combines.In addition, without conflicting with each other, those skilled in the art can be real by the difference described in this specification
Apply example or example and different embodiments or exemplary feature is combined and combines.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made, is directly or indirectly used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of pfc circuit, the pfc circuit is applied to electric machine control system, it is characterised in that the pfc circuit includes electricity
Anti- device, rectification part, current detecting part, filter circuit, alternating voltage sampling unit, DC voltage sampling unit and calculation control unit；Institute
State the input terminal that reactor connects AC power with the current detecting part, the reactor, current detecting part and rectification part string
It is associated in ac power supply circuit；The rectification part output terminal connects dc bus, and the filter circuit passes through the dc bus
It is connected with the rectification part；
The rectification part includes the first diode, the second diode, the 3rd diode, the 4th diode and carries fly-wheel diode
First switch pipe and second switch pipe, the public anode after first diode and the second diodes in parallel connection, and
Common cathode after 3rd diode and the 4th the diodes in parallel connection is connected with the L lines of AC power；Described first
The N lines of points of common connection and AC power after switching tube and the series connection of second switch pipe connect, the first switch pipe and second
Common cathode connection after one end is connected with first diode and the second diodes in parallel after switching tube series connection, described first
Public sun after the other end is connected with the 3rd diode and the 4th diodes in parallel after switching tube and the series connection of second switch pipe
Pole connects, and the control terminal of the first switch pipe and second switch pipe connects the calculation control unit respectively；Wherein,
The current detecting part is used to detect the AC input current, and obtains corresponding AC input current value；The filter
Wave circuit is used to carry out smothing filtering to the direct current of rectification module output to export DC bus-bar voltage；The alternating current
Pressure sampling unit is used to detect AC-input voltage, and obtains corresponding AC-input voltage value；The DC voltage sampling unit is used
In the detection DC bus-bar voltage, and obtain corresponding d-c bus voltage value；
The calculation control unit includes PFC calculation control units, and the direct current that the PFC calculation control units are used to obtain motor operation is female
Line voltage set-point, and according to the AC-input voltage value, the d-c bus voltage value, the AC input current value with
And the DC bus-bar voltage set-point generation PFC duty cycle of switching signal drives the switching tube work of the rectification part, with right
The alternating current of the input carries out Active PFC.
2. pfc circuit as claimed in claim 1, it is characterised in that when the AC input current is detected in the electric current portion,
The intermediate time that the first switch pipe or the second switch pipe are turned on or off carries out current sample.
3. pfc circuit as claimed in claim 1, it is characterised in that the electric machine control system include phase current sampling portion and
Inverter；
The phase current sampling portion is used to sample the phase current signal of the motor and is input to the motor calculation control unit；
The inverter input terminal connects the dc bus, and the inverter output end connects motor；
The calculation control unit further includes motor calculation control unit, and the motor calculation control unit is used for according to the dc bus
The rotating speed of target value of magnitude of voltage, the phase current signal of the motor and the motor calculates generation pulse width signal, described
Calculation control unit also generates triangle carrier signal, and generates PWM according to the triangle carrier signal and the pulse width signal
Control signal is to the inverter, to drive the motor operation.
4. pfc circuit as claimed in claim 3, it is characterised in that the motor calculation control unit includes：
Location/velocity estimation module, for being estimated the rotor-position of motor to obtain the rotor angle estimate of motor
With motor speed estimate；
Q axis gives current value computing module, and electricity is given for calculating Q axis according to motor rotating speed of target value, motor speed estimate
Flow valuve；
D axis gives current value computing module, for the maximum output voltage and the output voltage amplitude of inverter according to inverter
Calculate D axis and give current value；
Current control module, for giving current value according to the Q axis, the D axis gives current value, motor speed estimation
Value, the d-c bus voltage value and the phase current values to motor sampling, which calculate, generates the pulse width signal, and
The pwm control signal is generated to the inverter according to the triangle carrier signal and the pulse width signal, with driving
The motor operation.
5. pfc circuit as claimed in claim 4, it is characterised in that the D axis, which gives current value computing module, to be included：
Weak magnetic controller, carry out by the output voltage amplitude of the maximum output voltage to the inverter and the inverter based on
Calculate and give current value initial value to obtain D axis；
Clipping unit, amplitude limiting processing is carried out to obtain the D axis to constant current for giving current value initial value to the D axis
Value.
6. pfc circuit as claimed in claim 4, it is characterised in that the current control module further includes：
Q shaft currents value and D shaft current value computing units, for being calculated according to the phase current values and the angle estimation value
Obtain the Q shaft currents value and the D shaft currents value.
7. pfc circuit as claimed in claim 4, it is characterised in that the current control module is additionally operable to：
The phase current values of motor operation are obtained, and transfer the first phase current values to prestore and the second phase current values correspond to respectively
The first Q axle inductances, the 2nd Q axle inductances value and the first D axle inductances, the 2nd D axle inductance values, according to the phase current values and
First phase current values and second phase current values, the first Q axle inductances, the 2nd Q axle inductances value and described
First D axle inductances, the 2nd D axle inductances value calculate Q axle inductances and D axle inductance values.
8. such as claim 4 to 7 any one of them pfc circuit, it is characterised in that the PFC calculation control units include weak magnetic
Critical voltage computing module, AC voltage parameter determining module, weak magnetic critical voltage value clipping module, inductor current value calculate mould
Block, PFC switching signal duty cycle computing modules and switching signal generation module；Wherein
The weak magnetic critical voltage value computing module, for according to the Q axis given voltage value, the D axis given voltage value with
And the weak magnetic critical voltage values of index of modulation Kmax when being calculated motor operation；
The AC voltage parameter determining module, for the AC-input voltage value gathered according to alternating voltage sampling unit, carries out
Calculating respectively obtain AC-input voltage polarity mark signal, AC-input voltage virtual value, AC-input voltage absolute value and
Zero passage detection signal；
The weak magnetic critical voltage value clipping module, the direct current mother is obtained for carrying out amplitude limit to the weak magnetic critical voltage value
Line voltage set-point；
The inductive current set-point computing module, for according to the DC bus-bar voltage set-point and dc bus electricity
Pressure value carries out that the inductive current set-point is calculated；
The inductor current value computing module, for according to the AC input current value and AC-input voltage polarity sign letter
Number the inductor current value is calculated；
The PFC switching signals duty cycle computing module, for according to the inductive current set-point and the inductor current value
The PFC switching signals duty cycle signals are calculated；
The switching signal generation module, for according to the PFC switching signals duty cycle signals, AC-input voltage polarity mark
Show signal and switching signal is calculated to control the first switch pipe or described second open in alternating voltage zero-crossing signal
Close pipe switch.
9. a kind of electric machine control system, it is characterised in that including such as claim 1 to 8 any one of them pfc circuit.
10. a kind of transducer air conditioning, it is characterised in that including electric machine control system as claimed in claim 9.
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| CN111720947A (en) * | 2020-06-19 | 2020-09-29 | 海信（山东）空调有限公司 | Method for controlling bus voltage of air conditioner, air conditioner and storage medium |
| CN116455269A (en) * | 2023-06-14 | 2023-07-18 | 上海泰矽微电子有限公司 | Brushless DC motor control method |
| CN116455269B (en) * | 2023-06-14 | 2023-09-01 | 上海泰矽微电子有限公司 | Brushless DC Motor Control Method |
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