CN107834838B - A kind of control method of non-isolation type Three-phase PFC - Google Patents
A kind of control method of non-isolation type Three-phase PFC Download PDFInfo
- Publication number
- CN107834838B CN107834838B CN201710970323.7A CN201710970323A CN107834838B CN 107834838 B CN107834838 B CN 107834838B CN 201710970323 A CN201710970323 A CN 201710970323A CN 107834838 B CN107834838 B CN 107834838B
- Authority
- CN
- China
- Prior art keywords
- phase
- afterflow
- driving signal
- voltage
- electrode bus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of control methods of non-isolation type Three-phase PFC, wherein converter includes switch unit, rectification unit and energy storage afterflow unit, switch unit includes three switching groups, and three switching groups are separately positioned in three phase lines of the phase three-wire three power supply of access；Three switching groups pass through three phase lines respectively and connect with rectification unit；Energy storage afterflow unit includes the first to the second afterflow inductance and filter capacitor, the positive terminal of rectification unit is connected by positive electrode bus with first afterflow inductance one end, negative pole end is connected by negative electrode bus with second afterflow inductance one end, filter capacitor is equipped between positive electrode bus and negative electrode bus, the other end of the other end of the first afterflow inductance and the second afterflow inductance is connect with the both ends of filter capacitor respectively.The configuration of the present invention is simple, control logic are also more simplified, therefore in high power density occasion, advantage is fairly obvious.
Description
Technical field
The present invention relates to field of power electronics, more particularly to a kind of non-isolation type Three-phase PFC and its controlling party
Method.
Background technique
Since the capacity of single devices power load in recent years is increasing, be mostly using three phase supply, such as it is electronic
Vehicle charging station etc., were it not for PFC correcting function the power quality of power grid will be destroyed it is very big, or even it is serious when will lead to
The paralysis of power grid.
For a long time, for PFC (Active PFC) circuit of three-phase alternating current input, usually with boosting (boost) type
Based on (such as Fig. 1), be three-level structure, two capacitor midpoint potentials and the current potential at power grid midpoint are essentially identical, pass through two-way switch
The electric current of corresponding phase is controlled respectively.The current amplitude for switching the correspondence phase closed increases, and switch corresponds on bridge arm when disconnecting
Diode current flow circuit, output voltage under the action of Boost inductance on electric current reduce, to realize control to electric current
System.But Boost booster type output voltage is higher, not can guarantee that PF (power factor (PF)) value and THDI (Current harmonic distortion sum) refer to
Preferably, as inputted nominal phase three-wire three 380VAC, output is general all in 720V or so for mark, or even in 800V, and conventional property
Can preferable power tube in 650V hereinafter, occur the novel switched devices such as the SIC of slightly higher 1200V of voltage or so in recent years,
But it is with high costs；Therefore, the DC converter of rear end is confined to the finiteness of power device, to take into account efficiency and other factors,
It deals with and is more troublesome.For this purpose, being drop there is an urgent need to seek both to be able to satisfy power quality and the low pfc circuit of voltage
Pressure type PFC, thus everybody except in addition to continuing to use more typical boost type pfc circuit, also start explore decompression (BUCK) formula
Pfc converter.
As shown in Fig. 2, in 2012 in 27 IEEE applied power electronics fair (Annual IEEE Applied
Power Electronics Conference and Exposition (APEC 2012) 27th) on deliver the paper of publication
《Swiss rectifier—A novel three-phase buck-type PFC topology for Electric
Vehicle battery charging ", more typical buck pfc circuit is described in recent years, wherein more typical
SWiSS RECTIFER circuit is innovated and has been developed compared to 6-switch buck-type pfc circuit (Fig. 3), sound
Claim loss lower, it is more efficient.From the point of view of careful analysis, really by the rotation of reduction HF switch pipe, and in electric current time
Its improvement claimed may be implemented in the quantity reduction of switching device in road, but relatively high in finite volume or cost requirement
Place, which also has its some limitations, special if the quantity of power device is more (Fig. 2 is 16, and Fig. 3 is 12)
It is not switching tube, since the current potential of each switching tube (or switch unit) is different, requires an independent driving power,
Therefore driver circuit is more and complicated, for the angle for doing actual product, Swiss rectifier and 6-switch buck-
There is no too big advantages compared in control and cost by type PFC, especially in the higher occasion of power density requirements, instead
Because number of devices increases as disadvantage.
The disclosure of background above technology contents is only used for auxiliary and understands inventive concept and technical solution of the invention, not
The prior art for necessarily belonging to present patent application shows above content in the applying date of present patent application in no tangible proof
In the case where having disclosed, above-mentioned background technique should not be taken to the novelty and creativeness of evaluation the application.
Summary of the invention
It is above-mentioned existing to solve present invention aims at proposing a kind of non-isolation type Three-phase PFC and its control method
Have caused by structure is complicated existing for technology and is not suitable for being applied in the relatively high place of finite volume or cost requirement
The technical issues of.
For this purpose, the present invention proposes a kind of non-isolation type Three-phase PFC, including switch unit, rectification unit and energy storage
Afterflow unit, the switch unit include three switching groups, and three switching groups are separately positioned on the phase three-wire three electricity of access
In three phase lines in source；Three switching groups pass through three phase lines respectively and connect with the rectification unit；The energy storage afterflow
Unit includes the first to the second afterflow inductance and filter capacitor, and the positive terminal of the rectification unit is continuous with first by positive electrode bus
The series connection of galvanic electricity sense one end, negative pole end are connected by negative electrode bus with second afterflow inductance one end, and the positive electrode bus and cathode are female
The filter capacitor, the other end difference of the other end of the first afterflow inductance and the second afterflow inductance are equipped between line
It is connect with the both ends of the filter capacitor.
Preferably, the switching group includes the first power switch and the second power switch；First power switch and institute
The second power switch is stated to be driven by the same driving signal；Or, first power switch and second power are opened
Pass is driven each by independent driving signal.
Preferably, first power switch and second power switch are that metal-oxide-semiconductor or IGBT are managed.
Preferably, the amplitude range of the output voltage between the positive electrode bus and the negative electrode bus is up to that three-phase is mutually electric
Press VIN'sTimes.
It preferably, further include input filter, the input filter is arranged in the switch unit front end, phase three-wire three
Power supply accesses the switch unit after input filter filters.
Meanwhile the invention also provides a kind of non-isolation type Three-phase PFC, including at least two as above any described
Pfc converter, with the connection of in parallel or crisscross parallel between each pfc converter.
Further it is proposed that a kind of control method for any of the above-described Three-phase PFC, including with
Lower step: detection input/output condition judges whether input/output condition meets operating condition, the condition of being unsatisfactory for continues waiting for；
If meeting condition, start to work, locking phase processing is carried out to the phase three-wire three power supply voltage signal of input, judges phase three-wire three electricity
Phase locating for the current time in source and segment；To in the switch unit under current interval section, it is absolute to correspond to voltage magnitude
The switching group being worth on a smallest phase line applies its first driving letter that on state is constantly in segment of control
Number, and apply the second driving signal and third driving signal for carrying out PWM control to the switching group on other two phase line, so that
Can be formed between phase three-wire three power supply conducting circuit, and do not formed conducting circuit when, by energy storage afterflow unit first to
Second afterflow inductance carries out afterflow.
Preferably, first driving signal be PWM drive signal, driving voltage be greater than second driving signal and
The driving voltage of the third driving signal.
Preferably, in other two phase line, voltage direction is identical as that the smallest phase line of voltage magnitude absolute value
A phase line on switching group apply second driving signal, the different switching group of voltage direction applies the third driving
Signal, the duty ratio of second driving signal are less than the duty ratio of the third driving signal.
Finally, the invention proposes a kind of control method for Three-phase PFC described in parallel or crisscross parallel,
The Three-phase PFC that at least two are connected in parallel is controlled respectively by any of the above-described control method, at least
The operating phase of two Three-phase PFCs being connected in parallel differs half of high frequency period.
The beneficial effect of the present invention compared with the prior art includes:
From structure, the present invention overcomes the defects of traditional boost PFC circuit, so that the DC converter of rear end is not
With the finiteness for being confined to power device, voltage-dropping type pfc converter proposed by the present invention also changes the realization of conventional buck formula
Form has more simple topological structure, can save driving circuit (comprising supplying compared to 6-switch buck-type PFC
Electricity), compared to Swiss rectifier in addition to it can save driving circuit (comprising power supply), many power devices can also be saved,
Therefore entire ac-dc conversion circuit is simple, and control logic is simplified, high-efficient, is suitable for high efficiency and high power density demand field
It closes, advantage is fairly obvious；
Functionally, the conducting or inductive current work for each circuitry phase which can be effectively ensured
Make in continuous state, therefore there is preferable PF value and THDI, simultaneously as, symmetrical inductance (the first afterflow inductance of setting
L1 and the second afterflow inductance L2), in conjunction with filter capacitor, be conducive to the EMI performance for improving the converter of non-isolation type or obtain compared with
Good PF value and THDI.
From control, due to the simplification in structure, the reduction of power component thereby reduces the difficulty of control, from PFC
Function switch operation from the point of view of, by one of switching group apply "high" driving condition PWM drive signal, to other two
A switching group carries out the driving signal of PWM driving condition, as a result, can simplified control method.
So the present invention is in high power density occasion, advantage is fairly obvious, such as the three-phase PFC of full stock mould block size, meets
High, refined, peak products need.
Detailed description of the invention
Fig. 1 is existing boost type pfc circuit structural schematic diagram.
Fig. 2 is existing SWiSS RECTIFER circuit diagram.
Fig. 3 is existing 6-switch buck-type pfc circuit schematic diagram.
Fig. 4 is the schematic diagram of the non-isolation type Three-phase PFC of the embodiment of the present invention 1.
Fig. 5 is that the three-phase voltage waveform signal of the embodiment of the present invention 1 and joint define schematic diagram.
Fig. 6 be the embodiment of the present invention 1 the section AC-BC AB to conducting circuit diagram.
Fig. 7 is the AC-BC interval B C phase continuous current circuit schematic diagram of the embodiment of the present invention 1.
Fig. 8 is the section the AC-BC AC phase continuous current circuit schematic diagram of the embodiment of the present invention 1.
Fig. 9 is the section the AC-BC inductive current continuous current circuit schematic diagram of the embodiment of the present invention 1.
Figure 10 is the negative side potential change schematic diagram of single afterflow inductance (positive side) circuit.
Figure 11 is the equivalent transformation schematic diagram of the embodiment of the present invention 1.
Figure 12 is the current potential equivalent transformation waveform diagram of the embodiment of the present invention 1.
Figure 13 is each switching group drive waveforms relationship signal in the 1 three-phase alternating current period of the embodiment of the present invention.
Figure 14 is the structural schematic diagram of the variant embodiment 2 of the embodiment of the present invention 1.
Specific embodiment
With reference to embodiment and compares attached drawing invention is further described in detail.It is emphasized that
Following the description is only exemplary, the range and its application being not intended to be limiting of the invention.
Referring to the following drawings, non-limiting and nonexcludability embodiment will be described, wherein identical appended drawing reference indicates
Identical component, unless stated otherwise.
Embodiment 1:
As shown in figure 4, the present embodiment proposes a kind of non-isolation type Three-phase PFC, including switch unit, rectification list
Member, energy storage afterflow unit, the switch unit include three switching groups, and three switching groups are separately positioned on the three-phase of access
In three phase lines of three line power supplys；Three switching groups pass through three phase lines respectively and connect with the rectification unit；The storage
Can afterflow unit include the first to the second afterflow inductance and filter capacitor, the positive terminal of the rectification unit by positive electrode bus with
The series connection of first afterflow inductance one end, negative pole end are connected with second afterflow inductance one end by negative electrode bus, the positive electrode bus and
Be equipped with the filter capacitor between negative electrode bus, the other end of the first afterflow inductance and the second afterflow inductance it is another
End is connect with the both ends of the filter capacitor respectively.
As shown in figure 4, from the three phase mains that input terminal inputs, including A phase, B phase and C phase, the voltage letter of three of them phase line
It number can refer to Fig. 5, differ 120 degree of phase each other, since there may be jumps or polarity to dash forward for the power supply signal that actually enters
Become, so the voltage waveform shown in the present embodiment is for the ease of describing hereinafter, using the waveform of standard as referring to.The present embodiment
The converter shown further includes input filter, and the input filter setting is in the switch unit front end, phase three-wire three electricity
The switch unit is accessed in source after input filter filters, and in order to be greatly attenuated the EMI signal being passed to through power supply, protects equipment
From its evil, as shown in figure 4, the present embodiment is electromagnetic interface filter in the input filter of phase three-wire three input terminal, setting EMI is filtered
Wave device can also efficiently control the EMI signal that equipment itself generates, and prevent it from entering power grid, pollute electromagnetic environment, endanger other
Equipment can also be other kinds of filter in other alternative embodiments of the present embodiment.
The outlet side of electromagnetic interface filter is connected to switch unit, and switch unit is responsible for executing the switch behaviour of Active PFC
Make, three switching groups of switch unit are two-way switch, and each switching group includes the semiconductor power switch that two high frequencies are opened
(the first power switch and the second power switch) includes switching group in B phase as shown in figure 4, including switching group Q1Q2 in A phase
It include switching group Q5Q6 in Q3Q4, C phase, which can manage for metal-oxide-semiconductor, IGBT, those skilled in the art
It should be appreciated that the present invention is not limited to above two semiconductor power switch, it can also be other executable switch operations
Power component.A, the same driving power and the same driving signal are not shared between the respective switching group of B, C phase；Same phase
On two semiconductor power switch can share a driving power and the same driving signal, respectively can also independently drive
It is dynamic.By taking metal-oxide-semiconductor as an example, when the source electrode of two metal-oxide-semiconductors is oppositely arranged, a driving power and same driving letter can be shared
Number；When the source electrode of two metal-oxide-semiconductors is disposed opposite to each other, respectively can independently drive.Share a driving power and the same driving
Signal can make the structure of the present embodiment simpler, not need that too many driving unit is arranged, for finite volume or at
This requires relatively high place, has direct advantage.
As shown in figure 4, rectification unit be full-bridge type rectifier, including setting bridge arm on 6 diode D1, D2, D3,
D4,D5,D6.The anode-side of diode D1 and the cathode side of D4 are connected with A phase line, the anode-side of D2 and the cathode side of D5 and B
Phase line is connected, the cathode side of the anode-side of D3 and D6 are connected with C phase line, the cathode side of D1, D2, D3 for rectification unit just
Pole side is connect with positive electrode bus BUS+, and the anode-side of D4, D5, D6 are the negative side of rectification unit, with negative electrode bus BUS-
Connection.The cathode side of D1, D2, D3 are connect by positive electrode bus BUS+ with first one end afterflow inductance L1, the anode of D4, D5, D6
Side is connect by negative electrode bus BUS+ with the second afterflow inductance L2 and second one end afterflow inductance L2.
As shown in figure 4, the other end of the first afterflow inductance L1 is the cathode output end of converter, the second afterflow inductance L2's
The other end is the cathode output end of converter, and load can be connect between cathode output end and cathode output end (or can be equivalent to load
Circuit), the amplitude range of the output voltage of load-side is up to three-phase phase voltage VINVIN is phase
Voltage effective value.Filter capacitor C1 is equipped between cathode output end and cathode output end, filter capacitor C1 can make direct current output flat
Surely, influence of the alternation pulse ripple to electronic circuit, while the electric current generated in the also absorbable electronic circuit course of work are reduced
Fluctuation and the interference sealed in via AC power source, so that the working performance of electronic circuit is more stable.
The present embodiment is because be the pfc converter of non-isolation type, if there was only unilateral inductance after rectification unit rectifies
Come afterflow (afterflow inductance is only set in positive electrode bus or negative electrode bus), in negative electrode bus (BUS-) or positive electrode bus (BUS+)
There is no inductance, therefore the current potential of output end can turn on and off generation potential change, such as Figure 10 with input side switch unit
Shown only positive side is when having afterflow inductance, when being formed into a loop any two-phase in three-phase due to turning on and off for switch unit,
When outlet side has input current, then its current potential is consistent with the current potential of most negative input phase, when the switching group of wherein two-phase drives electricity
Pressure be " 0 " state when, i.e., when not constituting circuit, then its current potential be always the current potential of (or intermediate magnitude phase) of " 1 " state
Unanimously, thus the current potential without afterflow inductance side will form the variation of a high frequency pulse potential it is poor, the amplitude maximum of moment changes
1.5 times of Vp up to as shown in Figure 10, Vp are the peak-peak voltage of phase voltage, therefore to rear termination non-isolation type load
Electromagnetic interference is larger, is affected to output electrical equipment, this will be limited in actual use.
So as shown in figure 4, two symmetrical first afterflow inductance L1 and the second afterflow inductance L2 are arranged, for improving
The circuit structure of two symmetrical afterflow inductance is carried out equivalent, equivalent circuit diagram such as figure by the EMI performance of non-isolation type converter
Shown in 11, two capacitor C/2 are provided in outlet side it can be seen from fig. 11 that being equivalent to, load and the two capacitors C/2 are simultaneously
Connection, the midpoint of two capacitor C/2 is defined as equivalent midpoint, and due to the symmetry of rectification side, input side, which is led, to alive back
Lu Shi, equivalent midpoint are then string wave medians；After the switch unit (maximum duty cycle) of input completely closes, outlet side is still
It is full symmetric, therefore be considered as its relative potentials not having any variation, is not in that being forced property is clamped to intermediate width
The possibility of threshold voltage phase (or voltage phase of one state) solves the problems, such as that the pulse potential of high frequency variation is poor, therefore to rear
The electromagnetic interference for terminating non-isolation type load is smaller.As a result, the current potential of cathode output end (BUS-) by not with most negative input phase
Current potential is consistent；V- shown in current potential for example Figure 12 between equivalent midpoint and cathode output end (BUS-), equivalent midpoint with just
Current potential between pole output end (BUS+) is V+ as shown in Figure 12, the current potential at equivalent midpoint virtual ginseng as shown in Figure 12
The voltage of examination point；Filter capacitor C1 cooperates in symmetrically arranged two inductance (the first afterflow inductance of positive electrode bus and negative electrode bus
L1 and the second afterflow inductance L2), reduction crosstalk can be played.
As shown in figure 5, input A represents input A phase (Phase A), input B represents input B phase (Phase B), inputs C generation
Table inputs C phase (Phase C)；It for the convenience of description, setting three-phase voltage differs 120 °, and is sinusoidal voltage, every 360 ° one is followed
Ring；In view of stating intuitive and convenient, with 30 ° to 390 ° (30 ° of points in next period) for a complete cycle, therefore such as Fig. 5 institute
Show, each joint is respectively defined as AC (30 °), BC (90 °), BA (150 °), CA (210 °), CB (270 °), AB (330 °), AC
(30°/390°)；Zero crossing is designated as " O " point.If output voltage is less than the maximum voltage difference in certain two-phase of any time, because
This voltage-dropping type working principle is set up.
Therefore, if since AC point, BC point, the section AC-BC are arrived, section A phase and B phase voltage amplitude absolute value are higher than C
Phase, if three roads apply PWM drive signal, A phase and D1 in the circuit of B phase simultaneously, D5 is connected by positive bias-voltage, and C phase D3
And D6 cannot be connected by reversed bias voltage, as shown in fig. 6, Q1Q2, Q3Q4 are connected, electric current passes through switch unit and D1, L1, L2,
C1, D5 forming circuit.When the driving of the Q1Q2 perhaps driving closing of Q3Q4, then D3 or D6 can be connected and be continued by positive bias-voltage
Galvanic electricity sense L1, L2 constitute freewheeling path, in order to guarantee PF value, C phase can only with the voltage turn-on of opposite direction amplitude, therefore it is in the same direction
That phase voltage of amplitude first close (such as in 30 ° -60 ° or the section AC-O, the driving of A phase is then closed prior to B, such as Fig. 7, electricity
Stream is formed into a loop by switch unit and D3, L1, L2, C1, D5.60 ° -90 ° or the section O-BC, the driving of B phase is then prior to A correlation
It closes, such as Fig. 8, electric current is formed into a loop by switch unit and D1, L1, L2, C1, D6.), the PWM drive mode first closed is denoted as
" small ", the PWM drive mode turned off afterwards are denoted as " big ".
After the PWM driving voltage of AB two-phase is all closed, if C phase driving voltage still has, at this point, if inductive current
Afterflow can be carried out by D2+D5 or D1+D4, as shown in Figure 9；If C phase driving voltage is low level, inductive current if, can lead to
It crosses D1+D4 or D2+D5 or D3+D6 carries out afterflow.
According to the above working principle, if the driving of C phase holding is always existed (high level), or be more than or equal to other two
Such driving condition, can be abbreviated as "high" by the driving voltage of maximum PWM in phase, i.e., only need at this time the driving of AB two-phase according to
Control, which needs to send out corresponding high-frequency PWM driving signal, can realize the step-down rectifier of three-phase voltage, can simplify in the segment
To the driving logic control method of switch unit, while turn-on consumption can also be reduced；Meanwhile in the segment, the electricity of each phase
Stream can be connected, and with arc in phase, be not in certain phenomenon that mutually stops in uncontrollable rectifier.As long as therefore driving unit will
PWM drive signal modulates, so that it may so that current waveform and voltage waveform follow unanimously, therefore can obtain higher PF
Value, i.e. realization PFC correcting function.
For other segments, and so on, the section BC-BA, the driving signal of B phase is high driving condition, AC two
The driving signal of phase is PWM drive signal, and the driving in the section BC-O, C phase is then closed prior to A, the section O-BA, the driving of A phase
Then closed prior to C；
The section BA-CA, the driving signal of A phase are high driving condition, and the driving signal of BC two-phase is PWM drive signal, BA-
The driving in the section O, B phase is then closed prior to C, and the driving in the section O-CA, C phase is then closed prior to B.
The section CA-CB, the driving signal of C phase are high driving condition, and the driving signal of AB two-phase is PWM drive signal, CA-
The driving in the section O, A phase is then closed prior to B, and the driving in the section O-CB, B phase is then closed prior to A.
The section CB-AB, the driving signal of B phase are high driving condition, and the driving signal of AC two-phase is PWM drive signal, CB-
The driving in the section O, C phase is then closed prior to A, and the driving in the section O-AB, A phase is then closed prior to C.
The section AB-AC, the driving signal of A phase are high driving condition, and the driving signal of BC two-phase is PWM drive signal, AB-
The driving in the section O, B phase is then closed prior to C, and the driving in the section O-AC, C phase is then closed prior to B.
Since three-phase voltage might not be completely ideal in reality, there are the variations of phase, amplitude, direction, can only basis
Practical locking phase judges to generate the drive waveforms of each segment, therefore should be judged with the feature of each drive waveforms of segment,
Without indicating with desired angle, the characteristics of according to three phase mains signal, be segmented into six segments, six segments according to
Above-mentioned principle, the waveform logic table such as following table of the first driving signal, the second driving signal and third driving signal, wherein same
Under one segment, "high" is the first driving signal, other two PWM drive signals are the second driving signal and third driving letter
Number, in conclusion for the drive signal waveform logical table of Q1Q2, Q3Q4, Q5Q6 in a cycle.
Table one, drive waveforms logical table
It can be obtained according to each segment of drive waveforms logical table, method control as follows can be performed:
Input/output condition is detected, judges whether input/output condition meets operating condition, the condition of being unsatisfactory for continues waiting for；
If meeting condition, start to work, locking phase processing is carried out to the phase three-wire three power supply voltage signal of input, judges phase three-wire three electricity
Phase locating for the current time in source and segment；To in the switch unit under current interval section, it is absolute to correspond to voltage magnitude
The switching group being worth on a smallest phase line applies its first driving letter that on state is constantly in segment of control
Number, and apply the second driving signal and third driving signal for carrying out PWM control to the switching group on other two phase line, so that
Conducting circuit can be formed between phase three-wire three power supply, when input does not form conducting circuit, then pass through the of energy storage afterflow unit
One to the second afterflow inductance carries out afterflow and discharges the former energy being stored in inductance.
It need not meet that afterflow inductive current is continuous always, and every phase current is in the complete period in the case of different loads by the above method
Access will be constituted by the combination of switch, thus need to confirm in the present embodiment in " high " state it is corresponding mutually with it is next
Circuit can be constituted between that one-phase circuit first opened, the second driving signal of PWM control is applied to other two-phase, third drives
Signal.
The second driving signal, the third driving signal for carrying out PWM control, need to be further according to the zero crossing of three-phase voltage signal
6 original segments are divided into 12 segments, execute corresponding driving signal according to this 12 segments by " O ".With
For ACO segment, the switching group of C phase can be performed the first driving signal of "high" driving condition, so that the phase line one
Straight conducting；For the switching group on other two phase line, the inconsistent PWM drive signal of duty ratio each other will be accommodated, in this area
Between in section, the PWM drive signal of B phase is the third driving signal of " big " driving condition, and the PWM drive signal of A phase is " small " drive
Second driving signal of dynamic state, as shown in figure 13, third drive signal duty cycle is greater than the duty ratio of the second driving signal.It is logical
Above-mentioned control method is crossed, the conducting for each circuitry phase that can be effectively ensured or inductive current work in continuous state, realize with this
High PF and low THDI；
As shown in figure 13, the timing diagram under 12 different sections is summarized, accounting for for driving is adjusted to different segments
Empty ratio, it may be assumed that
When the voltage magnitude absolute value of phase is minimum in three-phase where switch unit, which is accommodated in the area
Between the first always on driving signal is kept in section；Meanwhile progress is applied respectively to the switch unit in other two-phase
The second driving signal and third driving signal of PWM control；In the segment, in other two phase line, voltage side
Switching group on a phase line identical with that the smallest phase line of voltage magnitude absolute value applies second driving signal,
The different switching group of voltage direction applies the third driving signal, and the duty ratio of second driving signal is less than the third
The duty ratio of driving signal.
It can be carried out according to following alternating mode using the above method:
If three switching groups that some time inscribes switch unit are both turned on, where two switching groups for carrying out PWM control
It is formed into a loop between two phase lines by rectification unit, the first to the second afterflow inductance；
When subsequent time, by opening on a voltage direction phase line identical with the smallest phase line of voltage magnitude absolute value
Pass group is closed, and the different switching group of voltage direction maintains conducting, so that maintaining a phase of conducting and voltage magnitude absolute value minimum
A phase between by rectification unit, the first to the second afterflow inductance be formed into a loop, complete afterflow；
Next moment is gone successively to, the two-phase for carrying out PWM control is turned off, is not formed into a loop in three-phase, by whole
It flows unit and symmetrically arranged first afterflow inductance and the second afterflow inductance carries out afterflow；
Subsequent time protects the switching group of a phase line identical with voltage magnitude absolute value the smallest phase voltage direction
Closing is held, the switching group in the different phase of voltage direction is connected again, and the phase line and voltage magnitude be connected again is absolute
It is worth between a smallest phase line and is formed into a loop, completes afterflow.
Subsequent time is entered back into, by opening for a phase line identical with voltage magnitude absolute value the smallest phase voltage direction
Pass group is opened, and voltage direction difference switching group is kept it turning on, at this point, the switching group on three-phase is opened, carries out the two of PWM control
It is formed into a loop between two phase lines where a switching group, thus recycles.
Corresponding A CO segment, when this starts, A phase and B are conducted, forming circuit, with that is, due to A phase driving signal duty
Than small, A phase is first closed, and B phase is connected with C, and then, the two is turned off, into inductance freewheeling state, since B phase driving signal accounts for
Sky is than big, and subsequent B phase is first opened, and B phase is connected with C, and forming circuit, subsequent A phase and B phase are opened, and A phase and B are conducted, so
Circulation into after next segment, the characteristics of according to OBC segment, changes duty ratio until ACO segment terminates.
First driving signal is PWM drive signal, and driving voltage is greater than second driving signal and third is driven
The driving voltage of dynamic signal；It is always for high level, or the duty ratio master with " big " state consistency about "high" driving condition
To depend on output loading, otherness be influence of the relative fluctuation to load of output voltage, the present embodiment right and wrong every
Release circuit, if output connects non-isolation type load, preferred " high " state can only be the driving signal with " big " state consistency.
If output is that isolated form loads, " high " state both of which driving signal, but is preferably and " big " state consistency
Driving signal.
From structure, the present invention overcomes the defects of traditional boost PFC circuit, so that the DC converter of rear end is not
With the finiteness for being confined to power device, voltage-dropping type pfc converter proposed by the present invention also changes the realization of conventional buck formula
Form has more simple topological structure, can save driving circuit (comprising supplying compared to 6-switch buck-type PFC
Electricity), compared to Swiss rectifier in addition to it can save driving circuit (comprising power supply), many power devices can also be saved,
Therefore entire ac-dc conversion circuit is simple, and control logic is simplified, high-efficient, is suitable for high efficiency and high power density demand field
It closes, advantage is fairly obvious；
Functionally, the conducting or inductive current work for each circuitry phase which can be effectively ensured
Make in continuous state, therefore there is preferable PF value and THDI, simultaneously as, symmetrical inductance (the first afterflow inductance of setting
L1 and the second afterflow inductance L2), in conjunction with filter capacitor, be conducive to the EMI performance for improving the converter of non-isolation type or obtain compared with
Good PF value and THDI.
From control, due to the simplification in structure, the reduction of power component thereby reduces the difficulty of control, from PFC
Function switch operation from the point of view of, by one of switching group apply "high" driving condition PWM drive signal, to other two
A switching group carries out the driving signal of PWM driving condition, as a result, can simplified control method.
So the present invention is in high power density occasion, advantage is fairly obvious, such as the three-phase PFC of full stock mould block size, meets
High, refined, peak products need.
Embodiment 2:
As shown in figure 14, the present embodiment proposes a kind of variant embodiment of pfc converter according to embodiment 1, and two
Isolated form Three-phase PFC (or crisscross parallel) in parallel signal, it is right respectively by control method described described in embodiment 1
At least two Three-phase PFCs being connected in parallel are controlled, and the present embodiment can be equivalent to series resonant half bridge, work as converter
A with and converter B driving signal half of high frequency period of working sequence misphase, then be crisscross parallel, can make input electric in this way
Stream is continuous, and improves EMI.
It would be recognized by those skilled in the art that it is possible for making numerous accommodations to above description, so embodiment is only
For describing one or more particular implementations.
It is counted as example embodiment of the invention although having been described and describing, it will be apparent to those skilled in the art that
It can be variously modified and is replaced, without departing from spirit of the invention.Furthermore it is possible to make many modifications with will be special
Condition of pledging love is fitted to religious doctrine of the invention, without departing from invention described herein central concept.So the present invention is unrestricted
In specific embodiment disclosed herein, but the present invention may further include belonging to all embodiments of the scope of the invention and its being equal
Object.
Claims (8)
1. a kind of control method of non-isolation type Three-phase PFC, it is characterised in that:
The non-isolation type Three-phase PFC includes switch unit, rectification unit and energy storage afterflow unit, the switch unit
Including three switching groups, three switching groups are separately positioned in three phase lines of the phase three-wire three power supply of access；Three institutes
It states switching group and passes through three phase lines respectively and connect with the rectification unit；The energy storage afterflow unit includes the first to the second afterflow
The positive terminal of inductance and filter capacitor, the rectification unit is connected by positive electrode bus with first afterflow inductance one end, negative pole end
It is connected by negative electrode bus with second afterflow inductance one end, the filtered electrical is equipped between the positive electrode bus and negative electrode bus
Hold, the other end of the other end of the first afterflow inductance and the second afterflow inductance both ends with the filter capacitor respectively
Connection；
The control method judges whether input/output condition meets work item the following steps are included: detection input/output condition
Part, the condition of being unsatisfactory for continue waiting for；If meeting condition, start to work, the phase three-wire three power supply voltage signal of input is carried out
Locking phase processing, judges phase locating for the current time of phase three-wire three power supply and segment；To the switch list under current interval section
In member, corresponding to the switching group on the smallest phase line of voltage magnitude absolute value, applying control, it locates always in segment
In the first driving signal of on state, and apply the second driving for carrying out PWM control to the switching group on other two phase line
Signal and third driving signal so that can form conducting circuit between phase three-wire three power supply, and when not forming conducting circuit, are led to
The the first to the second afterflow inductance for crossing energy storage afterflow unit carries out afterflow.
2. control method as described in claim 1, it is characterised in that: the switching group includes the first power switch and the second function
Rate switch；First power switch and second power switch are driven by the same driving signal；Or, described
One power switch and second power switch are driven each by independent driving signal.
3. control method as claimed in claim 2, which is characterized in that first power switch and second power switch
It is managed for metal-oxide-semiconductor or IGBT.
4. control method as described in claim 1, it is characterised in that: the output between the positive electrode bus and the negative electrode bus
The amplitude range of voltage is up to three-phase phase voltage VINTimes.
5. control method as described in claim 1, it is characterised in that: further include input filter, the input filter is set
It sets in the switch unit front end, phase three-wire three power supply accesses the switch unit after input filter filters.
6. control method as described in claim 1, it is characterised in that: first driving signal is PWM drive signal, is driven
Dynamic voltage is greater than the driving voltage of second driving signal and the third driving signal.
7. control method as described in claim 1, it is characterised in that: in the segment, in other two phase line,
Switching group on a voltage direction phase line identical with that the smallest phase line of voltage magnitude absolute value applies described second and drives
Dynamic signal, the different switching group of voltage direction apply the third driving signal, and the duty ratio of second driving signal is less than
The duty ratio of the third driving signal.
8. a kind of control method of non-isolation type Three-phase PFC, it is characterised in that:
Each non-isolation type Three-phase PFC includes at least two Three-phase PFCs, each Three-phase PFC
Between with the connection of in parallel or crisscross parallel；
Each Three-phase PFC includes that switch unit, rectification unit and energy storage afterflow unit, the switch unit include
Three switching groups, three switching groups are separately positioned in three phase lines of the phase three-wire three power supply of access；It is opened described in three
Pass group passes through three phase lines respectively and connect with the rectification unit；The energy storage afterflow unit includes the first to the second afterflow inductance
And filter capacitor, the positive terminal of the rectification unit are connected by positive electrode bus with first afterflow inductance one end, negative pole end passes through
Negative electrode bus is connected with second afterflow inductance one end, and the filter capacitor, institute are equipped between the positive electrode bus and negative electrode bus
The other end of the other end and the second afterflow inductance of stating the first afterflow inductance is connect with the both ends of the filter capacitor respectively；
The Three-phase PFC that at least two are connected in parallel is controlled respectively by control method described in claim 1,
The operating phase of at least two Three-phase PFCs being connected in parallel differs half of high frequency period.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710970323.7A CN107834838B (en) | 2017-10-16 | 2017-10-16 | A kind of control method of non-isolation type Three-phase PFC |
| PCT/CN2017/112379 WO2019075836A1 (en) | 2017-10-16 | 2017-11-22 | Non-isolated three-phase pfc converter and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710970323.7A CN107834838B (en) | 2017-10-16 | 2017-10-16 | A kind of control method of non-isolation type Three-phase PFC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107834838A CN107834838A (en) | 2018-03-23 |
| CN107834838B true CN107834838B (en) | 2019-11-12 |
Family
ID=61648245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710970323.7A Active CN107834838B (en) | 2017-10-16 | 2017-10-16 | A kind of control method of non-isolation type Three-phase PFC |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107834838B (en) |
| WO (1) | WO2019075836A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923637B (en) * | 2018-08-07 | 2021-02-19 | 中国航空工业集团公司雷华电子技术研究所 | Step-down non-isolated three-phase PFC converter and control method thereof |
| CN109167524B (en) * | 2018-11-06 | 2024-06-07 | 南京熊猫电子股份有限公司 | Three-phase alternating-current/direct-current buck-boost conversion circuit and control method thereof |
| CN109067219B (en) * | 2018-11-06 | 2024-05-10 | 南京熊猫电子股份有限公司 | Three-phase AC/DC converter and control method thereof |
| CN114337330A (en) * | 2020-09-30 | 2022-04-12 | 重庆美的制冷设备有限公司 | Control circuit, control method, circuit board, air conditioner and storage medium |
| CN112737308B (en) * | 2021-01-13 | 2024-05-14 | 茂硕电源科技股份有限公司 | Wide-voltage hybrid PFC converter and switching power supply |
| CN112953193B (en) * | 2021-03-12 | 2024-04-26 | 联合汽车电子有限公司 | Three-phase PFC soft start current impact inhibition method and device, charger and medium |
| CN117439429B (en) * | 2023-12-21 | 2024-04-12 | 广东省洛仑兹技术股份有限公司 | Control method of soft switch Vienna rectifying circuit and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100561322B1 (en) * | 1997-11-10 | 2006-06-16 | 후지 덴키 가부시끼가이샤 | Multiphase Voltage Converter |
| US8233298B2 (en) * | 2008-06-05 | 2012-07-31 | Delta Electronics, Inc. | Power factor correction rectifier that operates efficiently over a range of input voltage conditions |
| CN102931829B (en) * | 2012-11-09 | 2015-11-25 | 华为技术有限公司 | Circuit of power factor correction and power circuit |
| CN104811061A (en) * | 2015-04-30 | 2015-07-29 | 安徽动力源科技有限公司 | Novel three-phase PFC (power factor correction) rectifier |
| CN207368870U (en) * | 2017-10-16 | 2018-05-15 | 深圳市保益新能电气有限公司 | A kind of non-isolation type Three-phase PFC |
-
2017
- 2017-10-16 CN CN201710970323.7A patent/CN107834838B/en active Active
- 2017-11-22 WO PCT/CN2017/112379 patent/WO2019075836A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019075836A1 (en) | 2019-04-25 |
| CN107834838A (en) | 2018-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107834838B (en) | A kind of control method of non-isolation type Three-phase PFC | |
| CN104702093B (en) | Bridgeless power factor circuit correcting circuit | |
| CN109167524A (en) | A kind of three-phase alternating current-direct current buck translation circuit and its control method | |
| CN109067219A (en) | A kind of three-phase AC/DC conversion device and its control method | |
| CN107276443B (en) | Improvement type fixed-frequency hysteresis current control method and circuit based on control type Sofe Switch | |
| CN111416534B (en) | Current path reconstruction type single-phase five-level rectifier | |
| CN105939126B (en) | A kind of quasi- Z-source inverter of switched inductors type mixing | |
| CN101540507B (en) | Compensating three-phase active power factor correcting circuit | |
| CN106329977A (en) | Inverter circuit control method | |
| CN107834886A (en) | A kind of single-stage boost inverter and its control method | |
| CN103997238A (en) | Half-cycle modulation method for double-Boost inverter | |
| CN107086807B (en) | A kind of boosting inverter | |
| CN103825475A (en) | Circuit and control method for improving vehicle-mounted charger power factor | |
| CN209134309U (en) | A kind of three-phase alternating current-direct current buck translation circuit | |
| CN110165921A (en) | One kind having the quasi- Z-source inverter of high output voltage gain switch inductive type | |
| CN103780118A (en) | Resonant DC link three-level soft switching inverter circuit | |
| CN108923637A (en) | A kind of non-isolated Three-phase PFC of buck and its control method | |
| CN206226317U (en) | The integrated three-level dual-buck half-bridge inverter of magnetic | |
| CN207368870U (en) | A kind of non-isolation type Three-phase PFC | |
| CN103812373A (en) | DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof | |
| CN108809130B (en) | Modulation method of Semi-Z source single-phase inverter | |
| CN107124105A (en) | Improve isolated form three-level PFC converter PF control system and method | |
| CN106452152A (en) | Switch boost type high-gain quasi-Z-source inverter | |
| CN206410183U (en) | A kind of circuit for being used to improve power of variable-frequency microwave oven factor | |
| CN209105056U (en) | A kind of three-phase AC/DC conversion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |