CN108288911A - 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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- CN108288911A CN108288911A CN201810295704.4A CN201810295704A CN108288911A CN 108288911 A CN108288911 A CN 108288911A CN 201810295704 A CN201810295704 A CN 201810295704A CN 108288911 A CN108288911 A CN 108288911A
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- 238000000034 method Methods 0.000 title abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 25
- 230000009466 transformation Effects 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 6
- 238000000844 transformation Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000005669 field effect Effects 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The present invention provides a kind of correcting circuit, method and the air conditioners of three-phase APFC, wherein the correcting circuit includes three-phase voltage source, for providing three-phase alternating current；One end of three the first bridge arms, each first bridge arm is connect with each three-phase voltage source respectively, and the other end of at least two first bridge arms is connect with a resistance respectively；And processing circuit, it is connected at least two resistance, for determining the electric current for flowing through at least two resistance in a PWM cycle, to obtain the three-phase current of the three-phase alternating current.Present invention improves over the samplings of three-phase current, by determining at least two ohmically electric currents, 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, at least two
A resistance is respectively arranged in bridge arm one end of voltage source, and processing circuit determines the circuit for flowing through at least two resistance, in conjunction with three-phase electricity
Stream adds up to zero property, you can sampling obtains the value of three-phase current, so as to relatively simple realizes three-phase current
Sineization.
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；
One end of three the first bridge arms, each first bridge arm is connect with each three-phase voltage source respectively, and at least two first bridges
The other end of arm is connect with a resistance respectively；And
Processing circuit is connected at least two resistance, and at least two resistance are flowed through for determining in a PWM cycle
Electric current, 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 are one controllable
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, by the three-phase voltage
Each PWM cycle be divided into 6 sections；Judge the current direction of the three-phase alternating current in each section, keeps described the
The unlatching of one bridge arm and the shutdown of the second bridge arm；And sample at least two ohmically voltages and carry out operation, so that it is determined that
Flow through the electric current of at least two resistance.
Further, at least two resistance is also connected with an operational amplifier respectively, for amplifying the resistance
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 of at least two first bridge arms in three the first bridge arms is separately connected a resistance；And
The electric current that at least two resistance are flowed through in a PWM cycle is determined, to obtain the three-phase of the three-phase alternating current
Electric current.
Further, it determines the electric current for flowing through at least two resistance, obtains the tool of the three-phase current of the three-phase alternating current
Body sub-step includes：
According to the positive-negative phase of the three-phase voltage, each PWM cycle of the three-phase voltage is divided into 6 sections；
Judge the current direction of the three-phase alternating current in each section, keeps the unlatching of first bridge arm and described
The shutdown of second bridge arm；And
It samples at least two ohmically voltages in each section and carries out operation, so that it is determined that flowing through at least two resistance
Electric current.
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) it is without the use of current sampler, only needs at least two resistance (since three-phase current adds up to 0, when there are three electricity
When resistance, whether the verification three-phase current that can also be acquired is accurate；When there are two resistance, circuit can be simplified, be conveniently operated),
Processing circuit can obtain ohmically voltage, and zero is added up in conjunction with three-phase current, can be obtained three-phase current by operation
Size, it is simple in structure, save cost.
(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 three-phase voltage, each PWM cycle of the three-phase voltage is divided into 6 sections, and divide
At least two ohmically voltages are sampled not in each section and carry out operation, so that it is determined that flowing through the electricity of at least two resistance
Stream, it is easy to operate.
(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
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying 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 located at the current direction schematic diagram when sections V for three-phase voltage in Fig. 2.
Fig. 4 is the further circuit diagram of the correcting circuit of the three-phase APFC of the embodiment of the present invention.
Fig. 5 is the step schematic diagram of the bearing calibration of the three-phase APFC of the embodiment of the present invention.
Fig. 6 is the sub-step schematic diagram of the step S3 of the embodiment of the present invention.
Fig. 7 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
Flow sampler, only need at least two resistance (since three-phase current adds up to 0, when there are three resistance, the verification that can also acquire
Whether three-phase current is accurate；When there are two resistance, circuit can be simplified, be conveniently operated), processing circuit can obtain on resistance
Voltage, add up to zero in conjunction with three-phase current, the size of three-phase current can be obtained by operation, it is simple in structure, save
Cost.
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；
One end of three the first bridge arms, each first bridge arm is connect with each three-phase voltage source respectively, and at least two first bridges
The other end of arm is connect with a resistance respectively；And
Processing circuit is connected at least two resistance, for determining the electric current for flowing through at least two resistance, 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 meet relationship：Ia+Ib+Ic
=0.
It is understood that at least two resistance refer to two resistance or three resistance, that is to say, that any two first
The other end of bridge arm is connect with a resistance respectively or the other end of each first bridge arm is connect with a resistance respectively.And because
Three-phase current adds up to 0, and when there are three resistance, whether the verification three-phase current that can also be acquired is accurate；When there are two resistance
When, circuit can be simplified, be conveniently operated, specific choice can be selected according to actual requirement.
In the embodiment of the present 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 by an inductance or reactance between three pair of first bridge arm and the second bridge arm respectively, and each
First bridge arm and the second bridge arm are a controlled power device (such as insulated gate bipolar transistor IGBT, MOS field
Effect transistor MOSFET or intelligent power module).
It should be noted that the first bridge arm and unlimited its of the second bridge arm put placement.By taking Fig. 1 as an example, in the present embodiment
Three the first bridge arms refer to respectively with two resistance R8 and the R7 Q4 being connected and Q6 (i.e. two lower bridge arms), and not with this
Either one or two of among two resistance connected a pair of of controlled power device Q1 and Q2, three the second bridge arms refer to Q3, Q5 (on i.e. two
Bridge arm) and Q1 and Q2 among another.In addition, in other embodiments, the two resistance can also respectively with bridge arm on one
It is connected with a lower bridge arm, or is connected with two upper bridge arms, concrete condition is similar with Fig. 1, and details are not described herein.
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 being connected respectively with two voltage sources
Resistor network (being two sampling resistors in the present embodiment), the sample circuit is used to sample any two in three voltage differences
Voltage difference, three voltage differences refer to the voltage difference (i.e. Ubc, Uac and Uab) of any two voltage in three-phase alternating current；And
Any two voltage difference is exported to the processing circuit, to obtain the three-phase voltage of the three-phase alternating current；Wherein, described
Three voltage differences refer 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 are full
Sufficient 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, Uab, Uac and Uac or Uab and Uac,
Actual conditions are similar with the present embodiment, and details are not described herein.
Fig. 2 and Fig. 3 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, by three
Phase voltage is divided into 6 section I~VI.Fig. 3 is located at the current direction schematic diagram when sections V, such as Fig. 3 for three-phase voltage in Fig. 2
Shown, in the sections V, the 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, flows to Eb and Ea.
In the present invention, processing circuit is additionally operable to the positive-negative phase according to the three-phase voltage, by the three-phase voltage
Each PWM cycle is divided into 6 sections；The current direction of the three-phase alternating current is judged in each section, keeps described first
The shutdown of the unlatching and the second bridge arm (Q2, Q4 and Q6) of bridge arm (Q1, Q3 and Q5)；And at least two resistance in each section of sampling
On voltage and carry out operation, so that it is determined that flowing through the electric current of at least two resistance.
In figure 3, electric current must passes through two electric currents that can just sample in three-phase current on R8 and R7, that is,
It says, the Q4 and Q6 being connected with R8, R7 are necessary for open state, Q3 and Q5 as off state, and there are one be opening state in Q1 and Q2
State, here, by taking Q2 is open state as an example.Ic flows through Q6 and is divided into two-way, all the way pass through R8, Q4, Lb (such as inductance or
Reactor) until Eb, another way is by Q2, La until Ea.Therefore, there is-Ib to flow through on R8, there is Ic to flow through on R7, it is possible thereby to
Sampling obtains Ia, Ib and Ic.In other sections, three-phase current can sample to obtain by similar methods, no longer superfluous herein
It states.
According to some embodiments of the present invention, Fig. 4 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 4, the correcting circuit can also include：
One filter capacitor C1, is connected with three pair of first bridge arm and the second bridge arm, and the filter capacitor is flowed through for filtering out
Voltage in ripple；And
Parallel resistance network (the present embodiment is R5 and R6), electricity for determine C1 both ends in parallel with the filter capacitor
Pressure, since the voltage at the both ends C1 is excessive, the voltage that processing circuit directly acquires its both ends may will produce failure, therefore this implementation
In example, processing circuit obtains R6 both end voltages, and the voltage at the both ends C1 is determined further according to the partial pressure situation of R5 and R6.In other implementations
In example, 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 Fig. 5 is the three-phase APFC control methods of the embodiment of the present invention is illustrated
Figure, as shown in figure 5, the control method includes the following steps：
S1, three-phase alternating current is provided；
S2, at least two first bridge arms in three the first bridge arms one end be separately connected a resistance；
S3, the electric current that at least two resistance are flowed through in a PWM cycle is determined, to obtain the three of the three-phase alternating current
Phase current, wherein electric current Ia, Ib and Ic of the three-phase alternating current meet relationship：Ia+Ib+Ic=0.
Fig. 6 is the sub-step schematic diagram of the step S3 of the embodiment of the present invention, as shown in fig. 6, the wherein sub-step of step S3
It specifically includes：
S31, according to the positive-negative phase of the three-phase voltage, each PWM cycle of the three-phase voltage is divided into 6 areas
Between；
S32, the current direction that the three-phase alternating current is judged in each section, keep first bridge arm unlatching and
The shutdown of second bridge arm；And
S33, at least two ohmically voltages in each section are sampled and carry out operation, so that it is determined that flowing through at least two electricity
The electric current of 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 fig. 7, 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, only needs
At least two resistance, processing circuit can obtain ohmically voltage, add up to zero in conjunction with three-phase current, pass through operation
The size of three-phase current is obtained, it is simple in structure, save cost.Further, it is also possible to sample to obtain three-phase voltage, and by three-phase voltage
The conversion on coordinate, which is carried out, with three-phase current obtains the binary of same-phase in conjunction with the voltage and reference voltage of both ends of filter capacitor
Voltage and binary current obtain duty ratio and export to PWM rectifier bridges, realize three-phase electricity by processing such as adjuster, inverse transformations
The sineization of stream, to achieve the purpose that PFC.
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；
One end of three the first bridge arms, each first bridge arm is connect with each three-phase voltage source respectively, and at least two first bridge arms
The other end is connect with a resistance respectively；And
Processing circuit is connected at least two resistance, for determining the electricity for flowing through at least two resistance in a PWM cycle
Stream, 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 controlled power
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 3, which is characterized in that the processing circuit is additionally operable to basis
Each PWM cycle of the three-phase voltage is divided into 6 sections by the positive-negative phase of the three-phase voltage；Sentence in each section
The current direction of the disconnected three-phase alternating current keeps the unlatching of first bridge arm and the shutdown of the second bridge arm；And sampling is extremely
Few two ohmically voltages simultaneously carry out operation, so that it is determined that flowing through the electric current of at least two resistance.
5. the correcting circuit of three-phase APFC according to claim 1, which is characterized in that at least two resistance is also distinguished
It is connected with an operational amplifier, 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, which is characterized in that using the three-phase as described in any in claim 1 to 7
The correcting circuit of APFC comprising：
Three-phase alternating current is provided；
One end of at least two first bridge arms in three the first bridge arms is separately connected a resistance；And
The electric current that at least two resistance are flowed through in a PWM cycle is determined, 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 determination flows through at least two resistance
Electric current, the specific sub-step for obtaining the three-phase current of the three-phase alternating current include：
According to the positive-negative phase of the three-phase voltage, each PWM cycle of the three-phase voltage is divided into 6 sections；
The current direction of the three-phase alternating current is judged in each section, keeps the unlatching and described second of first bridge arm
The shutdown of bridge arm；And
It samples at least two ohmically voltages in each section and carries out operation, so that it is determined that flowing through the electricity of at least two resistance
Stream.
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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