CN108288910A - Correcting circuit, method and the air conditioner of three-phase APFC - Google Patents
Correcting circuit, method and the air conditioner of three-phase APFC Download PDFInfo
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- CN108288910A CN108288910A CN201810295699.7A CN201810295699A CN108288910A CN 108288910 A CN108288910 A CN 108288910A CN 201810295699 A CN201810295699 A CN 201810295699A CN 108288910 A CN108288910 A CN 108288910A
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- 238000000034 method Methods 0.000 title abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000009466 transformation Effects 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 17
- 230000003068 static effect Effects 0.000 claims description 6
- 238000000844 transformation Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 21
- 238000005516 engineering process Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
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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
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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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
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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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Abstract
The present invention provides a kind of correcting circuit, method and the air conditioners of three-phase APFC, including：Three-phase voltage source, for providing three-phase alternating current；Three the first bridge arms, connect with same resistance, and each first bridge arm is also connect with each three-phase voltage source respectively；And processing circuit, be connected with the resistance, in same PWM cycle two kinds of differences of the first bridge arm cut-off under state, double sampling flows through the electric current of the resistance, to obtain the three-phase current of the three-phase alternating current.Present invention improves over the samplings of three-phase current, pass through the ohmically electric current in the different sections of same PWM cycle, you can determine three-phase current, avoid using current sensor, cost is also saved while realizing the sineization of three-phase current.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of correcting circuit, method and the air conditioner of three-phase APFC.
Background technology
Currently, three phase mains convertible frequency air-conditioner is widely used, however power supply can be existed for during its use
Harmonic problem.To solve this technical problem, the prior art generally uses three-phase APFC (active power factor correction) control electricity
Road, this just needs the electric current and voltage signal of sampling three-phase power supply, but not altogether because of current signal and control circuit, therefore it is existing
There is technology to be generally used current sensor (S1 S2) sampling three-phase circuit of isolation, it will be apparent that, three-phase APFC control circuits
Device cost can be very high.
Invention content
In view of this, the present invention is directed to propose a kind of correcting circuit, method and the air conditioner of three-phase APFC, by three first
Bridge arm connects a resistance altogether, by the ohmically electric current in the different sections of same PWM cycle, is added in conjunction with three-phase current
The property for being zero, you can sampling obtains the value of three-phase current, so as to relatively simple realizes the sineization of three-phase current.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of correcting circuit of three-phase APFC, including：
Three-phase voltage source, for providing three-phase alternating current；
Three the first bridge arms, connect with same resistance, and each first bridge arm is also connect with each three-phase voltage source respectively；And
Processing circuit is connected with the resistance, in same PWM cycle two kinds of differences of the first bridge arm cut-off shape
Under state, double sampling flows through the electric current of the resistance, to obtain the three-phase current of the three-phase alternating current.
Further, further include：
Three the second bridge arms, each second bridge arm are connected with each first bridge arm one by one respectively, and three-phase voltage source passes through one respectively
Inductance or reactance are connected between three pair of first bridge arm and the second bridge arm, and each first bridge arm and the second bridge arm be one can
Control power device.
Further, further include：
Two sample circuits, each sample circuit include an operational amplifier being connect with the processing circuit and respectively with two
The connected sampling resistor network of a voltage source, the sample circuit are used to sample any two voltage difference in three voltage differences,
Three voltage differences refer to the voltage difference of any two voltage in three-phase alternating current；And any two voltage difference is exported to institute
Processing circuit is stated, to obtain the three-phase voltage of the three-phase alternating current；
Wherein, three voltage differences refer to the voltage difference of any two voltage in three-phase alternating current.
Further, the processing circuit is additionally operable to the positive-negative phase according to the three-phase voltage, in conjunction with first bridge
Arm cut-offs state, each PWM cycle of the three-phase voltage is divided into 6 sections, and the first bridge arm is opened in each section
There are three kinds of states for disconnected state；And the voltage for flowing through the resistance under arbitrary two states in these three states is sampled respectively
And operation is carried out, to which two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, double sampling flows through the resistance
Electric current.
Further, the resistance is also connected with an operational amplifier respectively, for amplifying the ohmically voltage.
Further, further include：
One filter capacitor is connect with three pair of first bridge arm and the second bridge arm, for filtering out the electricity for flowing through the filter capacitor
Ripple in pressure；And
Parallel resistance network, voltage for determine the both ends of filter capacitor in parallel with the filter capacitor.
Further, the processing circuit further includes：
Clark converter units, for the three-phase voltage to be passed through the binary electricity under coordinate transform convert to static coordinate
Pressure, and obtain the phase angle of the three-phase voltage；
First Park converter units, for the three-phase voltage to be converted to the binary under rotational coordinates by coordinate transform
Voltage；
2nd Park converter units, for according to the phase angle, the three-phase current to be converted by coordinate transform
For the binary current under rotational coordinates；
First adjuster, according to the voltage of both ends of filter capacitor and a reference voltage, determine binary reference current relative to
One given value of the binary current under rotational coordinates, another given value are 0；
Second adjuster, in conjunction with the binary current under two given values and rotational coordinates, determining two after adjusting
First voltage；
Park inverse transformation blocks, for by the binary voltages under the binary voltages and the rotational coordinates after the adjusting into
Row Park inverse transformations, determine the binary voltages after inverse transformation；And
SVPWM units, for according to the binary voltages after the voltage of both ends of filter capacitor and the inverse transformation, determining duty
Than, and the duty ratio is exported to the PWM rectifier bridges being made of three pair of first bridge arm and the second bridge arm, to realize three-phase alternating current
Sineization.
A kind of bearing calibration of three-phase APFC, using the correcting circuit of the three-phase APFC of any description above comprising：
Three-phase alternating current is provided；
One end in three the first bridge arms is connect with same resistance；And
Two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, and double sampling flows through the electric current of the resistance,
To obtain the three-phase current of the three-phase alternating current.
Further, two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, and double sampling flows through the electricity
The specific sub-step of the electric current of resistance includes：
State is cut-off in conjunction with first bridge arm, each PWM cycle of the three-phase voltage is divided into 6 sections, and
There are three kinds of states for the state of cut-offfing of the first bridge arm in each section；And
The voltage for flowing through the resistance under the arbitrary two states in these three states is sampled respectively and carries out operation, to
Two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, and double sampling flows through the electric current of the resistance.
Further, further include：
Any two voltage difference in three voltage differences is sampled, three voltage differences refer to any two in three-phase alternating current
The voltage difference of voltage；
The three-phase voltage of the three-phase alternating current is obtained according to any two voltage difference, wherein three voltage
Difference refers to the voltage difference of any two voltage in three-phase alternating current；
By the three-phase voltage by the binary voltages under coordinate transform convert to static coordinate, and obtain the three-phase
The phase angle of voltage；
The three-phase voltage is converted to by coordinate transform to the binary voltages under rotational coordinates；
According to the phase angle, the binary that the three-phase current is converted to by coordinate transform under rotational coordinates is electric
Stream；
According to the voltage of both ends of filter capacitor and a reference voltage, determine binary reference current relative under rotational coordinates
One given value of binary current, another given value are 0；
In conjunction with the binary current under two given values and rotational coordinates, the binary voltages after adjusting are determined；
Binary voltages under binary voltages and the rotational coordinates after the adjusting are subjected to Park inverse transformations, are determined inverse
Binary voltages after transformation；And
According to the binary voltages after the voltage of both ends of filter capacitor and the inverse transformation, duty ratio is determined, and by the duty
Than exporting to the PWM rectifier bridges being made of three pair of first bridge arm and the second bridge arm, to realize the sineization of three-phase alternating current.
A kind of air conditioner includes the correcting circuit of the three-phase APFC of any description above.
Compared with the existing technology, buffer and air conditioner of the present invention have the advantage that：
(1) three the first bridge arms are connect into a resistance altogether, passes through the ohmically electricity in the different sections of same PWM cycle
Stream, you can determine three-phase current, avoid using current sensor, also saved while realizing the sineization of three-phase current
Cost, and it is simple in structure, it is easily operated.
(2) operational amplifier can also be increased between resistance and processing circuit, amplify ohmically voltage, to obtain
More accurately three-phase current.
(3) according to the positive-negative phase of the three-phase voltage, state is cut-off in conjunction with first bridge arm, by the three-phase electricity
Each PWM cycle of pressure is divided into 6 sections, and two kinds of differences by sampling the first bridge arm in each section (same PWM cycle) are opened
Ohmically electric current under disconnected state, you can three-phase current in determining, it is easy to operate to be easily achieved.
(4) present invention also sampling obtains three-phase voltage, and three-phase voltage and three-phase current are carried out the conversion on coordinate, knot
The voltage and reference voltage for closing both ends of filter capacitor, obtain the binary voltages and binary current of same-phase, by adjuster, inversion
It the processing such as changes, obtain duty ratio and exports to PWM (pulse width modulation) rectifier bridge, realize the sineization of three-phase current, thus
Achieve the purpose that PFC.
Description of the drawings
Fig. 1 is the circuit diagram of the correcting circuit of the three-phase APFC of the embodiment of the present invention.
Fig. 2 is the curve synoptic diagram of the three-phase voltage of a specific embodiment of the invention.
Fig. 3 is the interval division schematic diagram in a PWM cycle of the three-phase voltage of a specific embodiment of the invention.
Fig. 4 is located at PWM schematic diagrames when one area of electric current for three-phase voltage in Fig. 3.
Fig. 5 cut-offs the current flow diagrams under state for the first of Fig. 4.
Fig. 6 is second of current flow diagrams cut-off under state of Fig. 4.
Fig. 7 cut-offs the current flow diagrams under state for the third of Fig. 4.
Fig. 8 is located at PWM schematic diagrames when 2nd area of electric current for three-phase voltage in Fig. 3.
Fig. 9 cut-offs the current flow diagrams under state for the first of Fig. 8.
Figure 10 is second of current flow diagrams cut-off under state of Fig. 8.
Figure 11 cut-offs the current flow diagrams under state for the third of Fig. 8.
Figure 12 is the further circuit diagram of the correcting circuit of the three-phase APFC of the embodiment of the present invention.
Figure 13 is the step schematic diagram of the bearing calibration of the three-phase APFC of the embodiment of the present invention.
Figure 14 is the sub-step schematic diagram of the step S3 of the embodiment of the present invention.
Figure 15 is the step schematic diagram of the bearing calibration of the three-phase APFC of a specific embodiment of the invention.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Currently, the prior art is generally used current sensor (S1 S2) sampling three-phase circuit of isolation, there are cost compared with
High problem.In view of this, the present invention provides a kind of correcting circuit, method and the air conditioner of three-phase APFC, without the use of electricity
Sampler is flowed, passes through the ohmically electric current in the different sections of same PWM cycle, you can determine three-phase current, avoiding makes
With current sensor, cost is also saved while realizing the sineization of three-phase current.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is the circuit diagram of the correcting circuit of the three-phase APFC of the embodiment of the present invention, as shown in Figure 1, the three-phase
The correcting circuit of APFC includes：
Three-phase voltage source, for providing three-phase alternating current；
Three the first bridge arms, connect with same resistance, and each first bridge arm is also connect with each three-phase voltage source respectively；And
Processing circuit is connected with the resistance, in same PWM cycle two kinds of differences of the first bridge arm cut-off shape
Under state, double sampling flows through the electric current of the resistance, to obtain the three-phase current of the three-phase alternating current, wherein the three-phase
Electric current Ia, Ib and Ic of alternating current meet relationship：Ia+Ib+Ic=0.
In some embodiments of the invention, which further includes three the second bridge arms, each second bridge arm respectively with
Each first bridge arm is connected one by one, and three-phase voltage source is connected to three pair of first bridge arm and the second bridge arm by an inductance or reactance respectively
Between, and each first bridge arm and the second bridge arm are a controlled power device.In general, each first bridge arm and
Two bridge arms are a controlled power device (such as insulated gate bipolar transistor IGBT, MOS field-effect transistor MOSFET
With integrated power module IPM).
In the embodiment in figure 1, resistance R7 is connected with three the first bridge arms (upper bridge arm), it is to be understood that at it
In his embodiment, which can also be connected with three the second bridge arms (lower bridge arm), and the case where two kinds of embodiments is similar.
Secondly, operational amplifier can also be increased between resistance and processing circuit, for amplifying ohmically voltage, from
And by amplified voltage output to processing circuit operation, obtain more accurately three-phase current.
In order to complete the correction of three-phase APFC, also need to sample three-phase voltage, which further includes：Two sampling electricity
Road.Each sample circuit includes an operational amplifier being connect with the processing circuit and the sampling resistor being connected respectively with voltage source
Network (being two resistance in the present embodiment), the sample circuit is used to sample any two voltage difference in three voltage differences,
Three voltage differences refer to the voltage difference (i.e. Ubc, Uac and Uab) of any two voltage in three-phase alternating current；And by arbitrary two
A voltage difference is exported to the processing circuit, to obtain the three-phase voltage of the three-phase alternating current；Wherein, three voltage
Difference refers to the voltage difference of any two voltage in three-phase alternating current, and voltage Va, Vb and Vc of the three-phase alternating current meet relationship：Va
+ Vb+Vc=0.
It should be noted that the correcting circuit can also include three sample circuits, three voltage differences are obtained, in conjunction with three
Whether a voltage adds up to 0 rule, examine three voltages acquired accurate with this.
Please in conjunction with Fig. 1, in the present embodiment, sample circuit 1 and sample circuit 2 respectively with voltage source Eb and Ec, Ea and
Eb is connected, and has sampled the two voltage differences of Ubc and Uab respectively, then pass through Va+Vb+Vc=0, you can obtain three-phase voltage
Voltage value.In other embodiments, sample circuit can also sample Ubc and Uac or Uab and Uac, actual conditions and sheet
Embodiment is similar, and details are not described herein.
Fig. 2 to Fig. 7 is combined with that, and the current direction in correcting circuit in a specific embodiment is described in detail.Fig. 2 is this
The curve synoptic diagram of the three-phase voltage of a specific embodiment is invented, as shown in Fig. 2, according to the positive-negative relationship of three-phase voltage, according to
The positive and negative variation of three-phase current is separation, and three-phase voltage is divided into one to 66 area in 0~360 ° of area.In addition, the first bridge
The state of cut-offfing of arm Q1, Q3 and Q5 have six kinds of states, V1 (001), V2 (010), V3 (011), V4 (100), V5 (101), V6
(110), a vector circle is divided into six sections I to VI.6 positive and negative areas of electric current are overlapped with 6 sections of switching vector selector to be seen
Fig. 3.
With that by taking an area as an example, three-phase electricity is wandered in the sections IV and VI that vector is justified at this time, Q1, Q3 and Q5 output
PWM is shown in Fig. 4, have 001 respectively, 101,100 3 kind cut-off state.Direction with electric current outflow is just Vc ＞ 0, Va ＞ 0, Vb ＜
0, therefore Ic ＞ 0, Ia ＞ 0, Ib ＜ 0, at this point, the electric current outflow of Ec and Ea, flows to Eb.
Referring to FIG. 5, the state of cut-offfing of first bridge arm Q1, Q3 and Q5 is 001 at this time, i.e. Q1 and Q3 shutdowns, Q2 and Q4 are opened
It opens, Q5 is opened, and Q6 shutdowns, Ia flows to Eb by Q2, Q4 and Lb；Ic is by Q5, filter capacitor C1, parallel resistance network (this reality
It is R5 and R6 to apply example), R7, Q4 and Lb flow to Eb, therefore the electric current that resistance R7 is up-sampled at this time is Ic.
Fig. 6 is please referred to, the state of cut-offfing of first bridge arm Q1, Q3 and Q5 is 101 at this time, i.e. Q1 and Q5 are opened, and Q2 and Q6 are closed
Disconnected, Q3 shutdowns, Q4 is opened, and Ia flows to Eb, Ic by Q1, filter capacitor C1, parallel resistance network (R5 and R6), R7, Q4 and Lb
Eb is flowed to by Q5, filter capacitor C1, parallel resistance network (R5 and R6), R7, Q4 and Lb, at this point, the electric current flowed through on R7 is
Ia+Ic, i.e.-Ib.
Fig. 7 is please referred to, the state of cut-offfing of first bridge arm Q1, Q3 and Q5 is 100 at this time, i.e. Q1 is opened, Q2 shutdowns, Q3 and Q5
Shutdown, Q4 and Q6 are opened, and Ia flows to Eb, Ic warps by Q1, filter capacitor C1, parallel resistance network (R5 and R6), R7, Q4 and Lb
It crosses Q6, Q4 and Lb and flows to Eb, therefore, the electric current that resistance R7 is up-sampled at this time is Ib.
As it can be seen that first bridge arm Q1, Q3 and Q5's cut-offs there are three types of states, it is only necessary to select arbitrary two kinds to cut-off under state,
R7 is sampled, you can it determines two voltages in three-phase voltage, 0 property is added up to further according to three-phase voltage, it can be really
The three-phase current being scheduled in the section.
It is please PWM schematic diagrames when three-phase voltage is located at 2nd area of electric current in conjunction with Fig. 8 to Figure 11, Fig. 8, Fig. 9 to Figure 11 is
Three kinds of differences of Fig. 8 cut-off the current flow diagrams under state, it is known that, when the state of cut-offfing is 101, the sample rate current on R7 is-
Ib；When the state of cut-offfing is 110, the sample rate current on R7 is Ia；When the state of cut-offfing is 110, the sample rate current on R7 is-
Ic.Processing circuit judge the sample rate current that three kinds are cut-off under state on R7 so that it is determined that three-phase current method and one area's class of electric current
Seemingly, details are not described herein.
According to some embodiments of the present invention, Figure 12 is the further of the correcting circuit of the three-phase APFC of the embodiment of the present invention
Circuit diagram, as shown in figure 12, which can also include：
One filter capacitor C1, connect with three pair of first bridge arm and the second bridge arm, and the filter capacitor is flowed through for filtering out
Ripple in voltage；And
Parallel resistance network R5 and R6, voltage for determine C1 both ends in parallel with the filter capacitor, due to the both ends C1
Voltage it is excessive, the voltage that processing circuit directly acquires its both ends may will produce failure, therefore in the present embodiment, processing circuit
R6 both end voltages are obtained, the voltage at the both ends C1 is determined further according to the partial pressure situation of R5 and R6.In other embodiments, parallel resistance
Network can also be three or more resistance, and situation is similar with the present embodiment, and details are not described herein.
After sampling obtains three-phase current and three-phase voltage, it is also necessary to a series of transformation, adjusting and inverse transformation are carried out,
In some embodiments, processing circuit further includes：
Three-phase voltage is passed through the binary under (Va, Vb and Vc) coordinate transform convert to static coordinate by Clark converter units
Voltage (V α and V β), and obtain the phase angle θ of the three-phase voltage；
First Park converter units, for the three-phase voltage (Va, Vb and Vc) to be converted to rotation by coordinate transform
Binary voltages (Vd and Vq) under coordinate；
2nd Park converter units, for according to the phase angle, the three-phase current (Ia, Ib and Ic) to be passed through seat
Mark transformation is converted to the binary current (Iq and Id) under rotational coordinates；
First adjuster (such as PID regulator or pi regulator) is referred to according to the voltage Vdc of both ends of filter capacitor and one
Voltage Vdc-ref determines a given value of the binary reference current relative to the binary current (Iq and Id) under rotational coordinates
Idref, another given value Iqref are 0；
Second adjuster, in conjunction with the binary current under two given values and rotational coordinates, determining two after adjusting
First voltage；
Park inverse transformation blocks, for by the binary voltages under the binary voltages and the rotational coordinates after the adjusting into
Row Park inverse transformations, determine the binary voltages after inverse transformation；
SVPWM units, for according to binary voltages (the U α after the voltage (Vdc) of both ends of filter capacitor and the inverse transformation
With U β), determine duty ratio, and the duty ratio is exported to the PWM rectifier bridges being made of three pair of first bridge arm and the second bridge arm, with
Realize the sineization of three-phase alternating current.
Another aspect of the present invention additionally provides a kind of bearing calibration of three-phase APFC, using three-phase APFC's above-mentioned
The step of correcting circuit carries out sineization to three-phase alternating current, and Figure 13 is the three-phase APFC control methods of the embodiment of the present invention is shown
It is intended to, as shown in figure 13, which includes the following steps：
S1, three-phase alternating current is provided；
S2, one end in three the first bridge arms is connect with same resistance；
S3, two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, and double sampling flows through the electricity of the resistance
Stream, to obtain the three-phase current of the three-phase alternating current, wherein electric current Ia, Ib and Ic of the three-phase alternating current, which meet, to close
System：Ia+Ib+Ic=0.
Figure 14 is the sub-step schematic diagram of the step S3 of the embodiment of the present invention, as shown in figure 14, the wherein sub-step of step S3
It is rapid to be specially：
S31, state is cut-off in conjunction with first bridge arm, each PWM cycle of the three-phase voltage is divided into 6 areas
Between, and there are three kinds of states for the state of cut-offfing of the first bridge arm in each section；And
S32, the voltage for flowing through the resistance under arbitrary two states in these three states is sampled respectively and carries out operation,
To which two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, double sampling flows through the electric current of the resistance.
It should be noted that after sampling three-phase electric current, in order to realize the sineization of three-phase alternating current, sampling three is also needed
Phase voltage, and three-phase current and three-phase voltage are handled, as shown in figure 15, it is subsequent the specific steps are：
Any two voltage difference in three S4, sampling voltage differences, three voltage differences refer to arbitrary in three-phase alternating current
The voltage difference of two voltage；
S5, the three-phase voltage that the three-phase alternating current is obtained according to any two voltage difference, wherein three electricity
Pressure difference refers to the voltage difference of any two voltage in three-phase alternating current, and voltage Va, Vb and Vc of the three-phase alternating current meet relationship：
Va+Vb+Vc=0；
It should be noted that can also sample to obtain three voltage differences, 0 rule is added up in conjunction with three voltages, with
Whether three voltages that this inspection acquires are accurate；
S6, three-phase voltage is passed through into binary voltages (the V α and V under (Va, Vb and Vc) coordinate transform convert to static coordinate
β), and the phase angle θ of the three-phase voltage is obtained；
S7, the three-phase voltage (Va, Vb and Vc) is converted to by coordinate transform to binary voltages (Vd under rotational coordinates
And Vq)；
S8, according to the phase angle, the three-phase current (Ia, Ib and Ic) is converted into rotation by coordinate transform and is sat
Binary current (Iq and Id) under mark；
S9, voltage Vdc and a reference voltage Vdc-ref according to both ends of filter capacitor, determine that binary reference current is opposite
One given value Idref of the binary current (Iq and Id) under rotational coordinates, another given value Iqref are 0；
S10, respectively in connection with the binary current (Iq and Id) under two given values (Idref and Iqref) and rotational coordinates,
Determine the binary voltages after adjusting；
S11, the binary voltages (Vd and Vq) under the binary voltages and the rotational coordinates after the adjusting are subjected to Park
Inverse transformation determines the binary voltages after inverse transformation；
S12, according to the binary voltages (U α and U β) after the voltage (Vdc) of both ends of filter capacitor and the inverse transformation, determine
Duty ratio, and the duty ratio is exported to the PWM rectifier bridges being made of three pair of first bridge arm and the second bridge arm, to realize three intersections
The sineization of galvanic electricity.
Another aspect of the invention additionally provides a kind of air conditioner, includes the correcting circuit of three-phase APFC above-mentioned, can
The sineization for realizing three-phase current, achievees the purpose that PFC；And easy to operate, structure simplifies, and saves cost.
To sum up, correcting circuit, method and the air conditioner of three-phase APFC of the invention is without the use of current sampler, by three
A first bridge arm connects a resistance altogether, passes through the ohmically electric current in the different sections of same PWM cycle, you can determine three-phase
Electric current is avoided using current sensor, and cost, and structure letter are also saved while realizing the sineization of three-phase current
It is single, it is easily operated.Further, it is also possible to sample to obtain three-phase voltage, and three-phase voltage and three-phase current on coordinate turn
It changes, in conjunction with the voltage and reference voltage of both ends of filter capacitor, the binary voltages and binary current of same-phase is obtained, through overregulating
The processing such as device, inverse transformation obtain duty ratio and export to PWM rectifier bridges, the sineization of three-phase current realized, to reach power
The purpose of factor correcting.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (11)
1. a kind of correcting circuit of three-phase APFC, which is characterized in that including：
Three-phase voltage source, for providing three-phase alternating current；
Three the first bridge arms, connect with same resistance, and each first bridge arm is also connect with each three-phase voltage source respectively；And
Processing circuit is connected with the resistance, in same PWM cycle two kinds of differences of the first bridge arm cut-off state
Under, double sampling flows through the electric current of the resistance, to obtain the three-phase current of the three-phase alternating current.
2. the correcting circuit of three-phase APFC according to claim 1, which is characterized in that further include：
Three the second bridge arms, each second bridge arm are connected with each first bridge arm one by one respectively, and three-phase voltage source passes through an inductance respectively
Or reactance is connected between three pair of first bridge arm and the second bridge arm, and each first bridge arm and the second bridge arm are a controllable work(
Rate device.
3. the correcting circuit of three-phase APFC according to claim 2, which is characterized in that further include：
Two sample circuits, each sample circuit include an operational amplifier being connect with the processing circuit and respectively with two electricity
The connected sampling resistor network of potential source, the sample circuit is used to sample any two voltage difference in three voltage differences, described
Three voltage differences refer to the voltage difference of any two voltage in three-phase alternating current；And any two voltage difference is exported to the place
Circuit is managed, to obtain the three-phase voltage of the three-phase alternating current；
Wherein, three voltage differences refer to the voltage difference of any two voltage in three-phase alternating current.
4. the correcting circuit of three-phase APFC according to claim 1, which is characterized in that the processing circuit is additionally operable to basis
The positive-negative phase of the three-phase voltage cut-offs state in conjunction with first bridge arm, and each PWM cycle of the three-phase voltage is drawn
It is divided into 6 sections, and there are three kinds of states for the state of cut-offfing of the first bridge arm in each section；And these three states are sampled respectively
In arbitrary two states under the voltage for flowing through the resistance and carry out operation, in same PWM cycle the first bridge arm
Two kinds of differences are cut-off under state, and double sampling flows through the electric current of the resistance.
5. the correcting circuit of three-phase APFC according to claim 1, which is characterized in that the resistance also respectively with an operation
Amplifier is connected, for amplifying the ohmically voltage.
6. the correcting circuit of three-phase APFC according to claim 4, which is characterized in that further include：
One filter capacitor is connect with three pair of first bridge arm and the second bridge arm, for filtering out in the voltage for flowing through the filter capacitor
Ripple；And
Parallel resistance network, voltage for determine the both ends of filter capacitor in parallel with the filter capacitor.
7. the correcting circuit of three-phase APFC according to claim 6, which is characterized in that the processing circuit further includes：
Clark converter units, for by the three-phase voltage by the binary voltages under coordinate transform convert to static coordinate, with
And obtain the phase angle of the three-phase voltage；
First Park converter units, for the three-phase voltage to be converted to the electricity of the binary under rotational coordinates by coordinate transform
Pressure；
2nd Park converter units, for according to the phase angle, the three-phase current to be converted to rotation by coordinate transform
Turn the binary current under coordinate；
First adjuster determines binary reference current relative to rotation according to the voltage of both ends of filter capacitor and a reference voltage
One given value of the binary current under coordinate, another given value are 0；
Second adjuster, in conjunction with the binary current under two given values and rotational coordinates, determining the binary electricity after adjusting
Pressure；
Park inverse transformation blocks, for carrying out the binary voltages under the binary voltages and the rotational coordinates after the adjusting
Park inverse transformations determine the binary voltages after inverse transformation；And
SVPWM units, for according to the binary voltages after the voltage of both ends of filter capacitor and the inverse transformation, determining duty ratio,
And the duty ratio is exported to the PWM rectifier bridges being made of three pair of first bridge arm and the second bridge arm, to realize three-phase alternating current
Sineization.
8. a kind of bearing calibration of three-phase APFC, using the correction electricity of the three-phase APFC as described in any in claim 1 to 7
Road comprising：
Three-phase alternating current is provided；
One end in three the first bridge arms is connect with same resistance；And
Two kinds of differences of the first bridge arm are cut-off under state in same PWM cycle, and double sampling flows through the electric current of the resistance, to
Obtain the three-phase current of the three-phase alternating current.
9. the bearing calibration of three-phase APFC according to claim 8, which is characterized in that the first bridge in same PWM cycle
Two kinds of differences of arm are cut-off under state, and the specific sub-step that double sampling flows through the electric current of the resistance includes：
State is cut-off in conjunction with first bridge arm, each PWM cycle of the three-phase voltage is divided into 6 sections, and each
There are three kinds of states for the state of cut-offfing of the first bridge arm in section；And
The voltage for flowing through the resistance under the arbitrary two states in these three states is sampled respectively and carries out operation, to same
Two kinds of differences of the first bridge arm are cut-off under state in one PWM cycle, and double sampling flows through the electric current of the resistance.
10. the bearing calibration of three-phase APFC according to claim 8, which is characterized in that further include：
Any two voltage difference in three voltage differences is sampled, three voltage differences refer to any two voltage in three-phase alternating current
Voltage difference；
The three-phase voltage of the three-phase alternating current is obtained according to any two voltage difference, wherein three voltage differences refer to
The voltage difference of any two voltage in three-phase alternating current；
By the three-phase voltage by the binary voltages under coordinate transform convert to static coordinate, and obtain the three-phase voltage
Phase angle；
The three-phase voltage is converted to by coordinate transform to the binary voltages under rotational coordinates；
According to the phase angle, the three-phase current is converted to by coordinate transform to the binary current under rotational coordinates；
According to the voltage of both ends of filter capacitor and a reference voltage, determine binary reference current relative to the binary under rotational coordinates
One given value of electric current, another given value are 0；
In conjunction with the binary current under two given values and rotational coordinates, the binary voltages after adjusting are determined；
Binary voltages under binary voltages and the rotational coordinates after the adjusting are subjected to Park inverse transformations, determine inverse transformation
Binary voltages afterwards；And
According to the binary voltages after the voltage of both ends of filter capacitor and the inverse transformation, duty ratio is determined, and the duty ratio is defeated
Go out to the PWM rectifier bridges being made of three pair of first bridge arm and the second bridge arm, to realize the sineization of three-phase alternating current.
11. a kind of air conditioner, which is characterized in that include the correction electricity of the three-phase APFC as described in any in claim 1 to 7
Road.
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