CN107800309A - A kind of single-stage isolated type Three-phase PFC and its control method - Google Patents
A kind of single-stage isolated type Three-phase PFC and its control method Download PDFInfo
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- CN107800309A CN107800309A CN201710970362.7A CN201710970362A CN107800309A CN 107800309 A CN107800309 A CN 107800309A CN 201710970362 A CN201710970362 A CN 201710970362A CN 107800309 A CN107800309 A CN 107800309A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 229920006926 PFC Polymers 0.000 claims description 43
- 239000003990 capacitor Substances 0.000 claims description 13
- 239000004065 semiconductor Substances 0.000 claims description 13
- 230000002441 reversible effect Effects 0.000 claims description 12
- 238000004146 energy storage Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 230000033228 biological regulation Effects 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 9
- 230000009466 transformation Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000035772 mutation Effects 0.000 description 5
- 238000013519 translation Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000004224 protection Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- 230000006641 stabilisation 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
-
- 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
Abstract
The invention discloses a kind of single-stage isolated type Three-phase PFC and its control method, its converter includes primary side input circuit, transformer and secondary output circuit, and primary side input circuit includes first switch unit, the first rectification unit, second switch unit, series resonance unit；First switch unit includes three switches sets, and three switches sets are separately positioned in three phase lines of the phase three-wire three power supply of access；Three switches sets are connected by three phase lines with the first rectification unit respectively；First rectification unit connects second switch unit and series resonance unit concatenated with one another, the primary side of transformer, the secondary side of transformer are connected with secondary output circuit；The structure of the present invention is simple, realizes AC-DC conversion function, Active PFC function, isolated variable, Sofe Switch and voltage regulation function, saves many power rate devices, be suitable for high power density occasion.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of single-stage isolated type Three-phase PFC and its
Control method.
Background technology
It is to use three phase supply mostly because the capacity of single devices power load in recent years is increasing, for example, it is electronic
Vehicle charging station etc., were it not for PFC correcting functions the quality of power supply of power network will be destroyed it is very big, or even it is serious when can cause
The paralysis of power network, at present, PFC (Active PFC) circuit, including two kinds of booster type (Boost) and voltage-dropping type (Buck), but
Booster type or voltage-dropping type PFC translation circuits are either used, if the isolation of output needs or voltage exceed certain limit,
Following stage is required to increase one-level DC converter, so for a long time, the ac-dc conversion circuit inputted for three-phase alternating current,
Generally PFC+DC/DC two-stage circuits, thus cause whole circuit design complex, therefore also have external colleague before
The three-phase AC/DC conversion device of single-stage was proposed, such as the cycloconverter that everybody is familiar with, wherein in EATON groups
Michael Harrison are that more typical high efficient three-phase is handed in the patent of invention WO2008/018802A2 of application in 2007
Single-stage converter is flowed, as shown in figure 1, the circuit realizes circuit reduction on the basis of traditional three-phase alternating current converter, together
When also achieve Sofe Switch, coordinate its control method almost ideal under preferable input condition；But due to the three of physical device
Phase input voltage source is simultaneously non-ideal, has a variety of transient electric-energy quality problems, than if any the temporary drop of power network, surging, frequency
The various actual conditions such as saltus step.Because the circuit is overly simplified, conducting can only be a phase switches set every time, and three-phase is successively
Samsara, directly loop is formed with the resonant capacitance being respectively connected by resonant inductance, transformer after opening；Originally it is according to normal
The circuit of logic working, in the case where there is saltus step or polarity mutation in input voltage, easily formed reverse spike voltage and
Electric current pours in down a chimney, and it must terminate work immediately and either be switched fast as corresponding protected mode (or operating mode), otherwise resonance electricity
The pressure difference of pressure (or electric current) and input source easily causes the damage of switches set, therefore it is detected protection and requires high, corresponds to not
Same grid condition needs to set different protections and mode of operation, and control algolithm certainly will be become into extremely complex, converter
DSP control unit arithmetic speed and memory space be all limited, therefore the topology apparatus can be too for the condition of power network
Cross sensitivity, grid adaptability is poor in other words, so as to cause reliability poor, can not large-scale quantify production, this be also to
The present loses the reason for technology promotes the use of product on a large scale.Therefore, we are necessary summarizing the technology base of every older generation
On plinth, redesign and invent a kind of circuit and go to realize high efficiency, high power density and high reliability.
The disclosure of background above technology contents is only used for inventive concept and the technical scheme that auxiliary understands the present invention, and it is not
The prior art of present patent application is necessarily belonged to, shows the applying date of the above in present patent application in no tangible proof
In the case of disclosed, above-mentioned background technology should not be taken to evaluate the novelty and creativeness of the application.
The content of the invention
It is above-mentioned to solve present invention aims at a kind of single-stage isolated type Three-phase PFC of proposition and its control method
The limited technical problem of application caused by structure existing for prior art and control method are complicated.
Therefore, the present invention proposes a kind of single-stage isolated type Three-phase PFC, including primary side input circuit, transformer
With secondary output circuit, the primary side input circuit includes first switch unit, the first rectification unit, second switch unit, string
Join resonant element；The first switch unit includes three switches sets, and three switches sets are separately positioned on the three-phase of access
In three phase lines of three line power supplys；Three switches sets are connected by three phase lines with first rectification unit respectively；Institute
State the first rectification unit and connect the second switch unit and the series resonance unit concatenated with one another, the one of the transformer
Secondary side, the secondary side of the transformer are connected with secondary output circuit；First rectification unit performs AC rectification operation, institute
State transformer to perform isolation and become press operation, the switches set had both been used to perform AC power factor correction switching manipulation, again matched somebody with somebody
Close the series resonance unit, the transformer and perform the second switch unit of reverse resonance channel selector operation together
Complete the function of series resonance translation circuit.
Preferably, the switches set 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 same drive signal；Or, first power switch and second power are opened
Pass is driven each via independent drive signal.
Preferably, the secondary output circuit includes the second rectification unit, second rectification unit can be voltage multiplying rectifier,
Full-wave rectification or full-bridge rectification.
Preferably, the secondary output circuit also includes energy storage afterflow unit, and the energy storage afterflow unit is not provided with afterflow
Inductance, sets filter capacitor, and the filter capacitor and second rectification unit simultaneously connect；Or the energy storage afterflow unit set to
A few afterflow inductance and at least one filter capacitor, at least one afterflow inductance concatenated with one another with it is at least one described
Filter capacitor is connected with second rectification unit.
Preferably, first power switch, second power switch and the second switch unit be metal-oxide-semiconductor or
IGBT is managed.
Preferably, the series resonance unit includes at least one resonant inductance and at least one resonant capacitance, described humorous
The inductance that shakes is connected in series with the resonant capacitance.
Preferably, the primary side input circuit also includes input filter, and the input filter is arranged on described first
Switch element front end, phase three-wire three power supply access the first switch unit after input filter filters.
Meanwhile the invention also provides another single-stage isolated type Three-phase PFC, including at least two as above any
Described pfc converter, connected with parallel or crisscross parallel between each pfc converter.
In addition, the invention also provides a kind of control method for above-mentioned single-stage isolated type Three-phase PFC, bag
Include following steps：
Input/output condition is detected, judges whether input/output condition meets condition of work, the condition of being unsatisfactory for continues waiting for；
If meeting condition, start working, lock phase processor is carried out to the phase three-wire three power supply voltage signal of input, judge phase three-wire three electricity
Phase and segment residing for the current time in source；
To in the first switch unit under current interval section, corresponding on the minimum phase line of voltage magnitude absolute value
Switches set, applying control, it is constantly in the first drive signal of conducting state in segment, and on other two phase line
Switches set apply carry out PWM controls the second drive signal and the 3rd drive signal, and to second switch unit carry out PWM
The fourth drive signal of control so that conducting loop can be formed between phase three-wire three power supply, and when not forming conducting loop, is led to
Cross second switch unit and realize afterflow and reverse resonance.
Preferably, the first drive signal of application is：Existing high level signal always；Or PWM drive signal, it is described
The driving voltage of PWM drive signal is more than the driving voltage of the second drive signal and the 3rd drive signal.
In the segment, in other two phase line, voltage direction that phase minimum with voltage magnitude absolute value
Switches set on the phase line of circuit identical one applies second drive signal, described in the different switches set of voltage direction applies
3rd drive signal, the dutycycle of second drive signal are less than the dutycycle of the 3rd drive signal, and the described 4th
The dutycycle of drive signal is identical with the dutycycle of the 3rd drive signal.
The dutycycle of 3rd drive signal is not more than 0.5, and the 3rd drive signal dutycycle is believed with the 4th driving
Number dutycycle form complementation.
Finally, the present invention proposes a kind of control method for above-mentioned single-stage isolated type Three-phase PFC, passes through
Any of the above-described described control method is controlled to the Three-phase PFC that at least two are connected in parallel respectively, wherein, at least
The operating phase of two Three-phase PFCs being connected in parallel differs half of high frequency period.
The beneficial effect that the present invention is compared with the prior art includes：
From structure, the present invention changes the implementation method that traditional pfc circuit adds DC-isolation translation circuit, passes through this
The topological structure of invention, the energy-storage units that can be saved after the AC rectification of conventional AC/DC convertor, while can also save straight
The power device and drive circuit of isolated variable are flowed, whole ac-dc conversion circuit is simple, and control logic is simplified, efficiency high,
It is suitable for high efficiency and high power density demand occasion；Functionally, relative to traditional with Active PFC function
For isolated form three-phase AC/DC conversion device, AC-DC conversion function, power factor (PF) school are achieved that by primary conversion circuit
Orthofunction, isolated variable, Sofe Switch and voltage regulation function, can save many power rate devices, while compared to being previously mentioned
Cycloconverter, because the input of phase three-wire three power supply can form loop between the two phases, every time conducting be no longer
One phase switches set, the situation that saltus step or polarity mutation occurs in input voltage can be successfully managed, its grid adaptability is stronger, work
Stability is higher, and equipment quality is relatively reliable.
Brief description of the drawings
Fig. 1 is existing high efficient three-phase exchange single-stage converter (cycloconverter) structural representation.
Fig. 2 is the schematic diagram of the isolated form Three-phase PFC of the embodiment of the present invention 1.
Fig. 3 is that the three-phase voltage waveform signal of the embodiment of the present invention 1 and joint define schematic diagram.
Fig. 4 be the embodiment of the present invention 1 AC-BC sections AB to conducting circuit diagram.
Fig. 5 is the AC-BC interval B C phase continuous current circuit schematic diagrames of the embodiment of the present invention 1.
Fig. 6 is the AC-BC sections AC phase continuous current circuit schematic diagrames of the embodiment of the present invention 1.
Fig. 7 is the AC-BC sections inductive current continuous current circuit schematic diagram of the embodiment of the present invention 1.
Fig. 8 is that the AC-BC sections Q7 of the embodiment of the present invention 1 leads the reverse freewheeling current path schematic diagram of figure.
Fig. 9 is the equivalent transformation signal 1 of the embodiment of the present invention 1.
Figure 10 is the equivalent transformation signal 2 of the embodiment of the present invention 1.
Figure 11 is the equivalent transformation signal 3 of the embodiment of the present invention 1.
Figure 12 is the equivalent transformation signal 4 of the embodiment of the present invention 1.
Figure 13 is the timing diagram of each drive signal under 12 segments in the embodiment of the present invention 1.
The structural representation of the variant embodiment 2 of Figure 14 embodiment of the present invention 1.
Figure 15 is the structural representation of the variant embodiment 3 of the embodiment of the present invention 1.
Figure 16 is that the secondary output circuit of the embodiment of the present invention 1 does not have the structural representation of afterflow inductance.
Embodiment
With reference to embodiment and compare accompanying drawing the present invention is described in further detail.It is emphasized that
What the description below was merely exemplary, the scope being not intended to be limiting of the invention and its application.
With reference to the following drawings, non-limiting and nonexcludability embodiment will be described, wherein identical reference represents
Identical part, unless stated otherwise.
Embodiment 1：
As shown in figure 4, the present embodiment proposes a kind of single-stage isolated type Three-phase PFC, including primary side input circuit,
Transformer and secondary output circuit, the primary side input circuit include first switch unit, the first rectification unit, second switch list
Member, series resonance unit；The first switch unit includes three switches sets, and three switches sets are separately positioned on access
In three phase lines of phase three-wire three power supply；Three switches sets are connected by three phase lines and first rectification unit respectively
Connect；First rectification unit connects the second switch unit and the series resonance unit concatenated with one another, the transformation
The primary side of device, the secondary side of the transformer are connected with secondary output circuit；First rectification unit performs AC rectification
Operation, the transformer perform isolation and become press operation, and the switches set is both used to perform AC power factor correction switch behaviour
Make, coordinate the series resonance unit, the transformer and the second switch for performing reverse resonance channel selector operation again
Unit completes the function of series resonance translation circuit together.
As shown in Fig. 2 phase three-wire three power supply includes A phases, B phases and C phases, the voltage signal of its three phase lines refers to figure
3,120 degree of phase is differed each other, because the power supply signal actually entered there may be saltus step or polarity mutation, so
The voltage waveform for implementing to exemplify is used as reference for the ease of describing hereinafter, using the waveform of standard.Primary side input circuit also includes
Input filter, the input filter are arranged on first switch unit front end, and phase three-wire three power supply filters through input filter
First switch unit is accessed afterwards, and in order to be greatly attenuated the EMI signal being passed to through power supply, protection equipment does harm to from it, such as Fig. 2 institutes
Show, the present embodiment is electromagnetic interface filter in the input filter of phase three-wire three input, sets electromagnetic interface filter also can effectively control
Control equipment caused EMI signal in itself, prevent it from entering power network, pollute electromagnetic environment, endanger other equipment, the present embodiment its
In his alternative embodiments, other kinds of wave filter can also be.
The outlet side of electromagnetic interface filter is connected to first switch unit, and three switches sets of first switch unit are two-way opened
Close, including the semiconductor power switch (the first power switch and the second power switch) that two high frequencies are opened, as shown in Fig. 2 A phases
Upper to include including including switches set Q5Q6 in switches set Q3Q4, C phase in switches set Q1Q2, B phase, the semiconductor power switch can be with
Managed for metal-oxide-semiconductor, IGBT, it should be appreciated by those skilled in the art to the present invention is not limited to above two semiconductor power and opened
Close, can also be the power component of other executable switching manipulations.A, do not shared between the respective switches set of B, C phase same
Driving power and same drive signal；Two semiconductor power switch in same phase can share a driving power and same
One drive signal, each can also independently it drive., can be with when the source electrode of two metal-oxide-semiconductors is oppositely arranged by taking metal-oxide-semiconductor as an example
Share a driving power and same drive signal；When the source electrode of two metal-oxide-semiconductors is disposed opposite to each other, each can independently drive
It is dynamic.Sharing a driving power and same drive signal can make it that the structure of the present embodiment is simpler, it is not necessary to set too
More driver elements, for the of a relatively high place of finite volume or cost requirement, there is direct advantage.
As shown in Fig. 2 the first rectification unit be full-bridge type rectifier, including set bridge arm on 6 diode D1,
D2, D3, D4, D5, D6, diode D1 anode-side and D4 cathode side are connected with A phase lines, D2 anode-side and D5 negative electrode
Side is connected with B phase lines, D3 anode-side and D6 cathode side are connected with C phase lines.
First rectification unit is connected with second switch unit Q7, can perform the switching manipulation of reverse resonance；Transformer Tra's
Primary side is connected with series resonance unit, and series resonance unit includes resonant inductance Lr and resonant capacitance Cr, second switch unit
Q7 is in parallel with series resonance unit and transformer primary side, second switch unit Q7 source side and diode D4, D5 and D6
Anode-side connects, and second switch unit Q7 drain side is connected with diode D1, D2, D3 cathode side；Second switch unit is same
Sample is the semiconductor power switch that high frequency is opened, and can equally be managed for metal-oxide-semiconductor, IGBT, it should be appreciated by those skilled in the art
Arrive, the invention is not limited in above two semiconductor power switch, can also be the power member of other executable switching manipulations
Part.Meanwhile in the present embodiment, as shown in figure 4, the diode of the first rectification unit and first switch unit etc. is parasitic in parallel electric
It is that Cp shows in circuit to hold parameter equivalent, it is preferred that when the Cp is less, can also optionally it increase, so as to
Vibration spike in suppression circuit.
Series resonance unit can include being not limited to the resonant inductance Lr and resonant capacitance Cr of one, the one of the present embodiment
In a little alternative embodiments, resonant inductance Lr and can be multiple with resonant capacitance Cr.
As shown in Fig. 2 transformer Tra two level side, is a typical full bridge rectifier, just few narration herein,
Including diode D11, D12, D13, D14, and afterflow inductance L2, filter capacitor C2, in the present embodiment, the secondary side of transformer
Can be with other rectification circuits, such as voltage multiplying rectifier, full-wave rectification and full-bridge rectification；Afterflow inductance L2, filter capacitor C2 are constituted
The energy storage afterflow unit of secondary side, energy storage afterflow unit can be not provided with afterflow inductance L2, only set filter capacitor C2, the filtering
Electric capacity C2 and the second rectification unit simultaneously connect, or set at least one afterflow inductance L2 and at least one filter capacitor C2, go here and there each other
At least one afterflow inductance L2 connect is connected with least one filter capacitor C2 with the second rectification unit.
As shown in figure 3, input A represents input A phases (Phase A), input B represents input B phases (Phase B), inputs C generations
Table input C phases (Phase C)；If three-phase voltage differs 120 °, and it is sinusoidal voltage, every 360 ° one is followed in order to facilitate description
Ring；In view of stating intuitive and convenient, with 30 ° to 390 ° (30 ° of points in next cycle) for a complete cycle, therefore such as Fig. 5 institutes
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 operation principle is set up.
Therefore, if since AC points, to BC points, AC-BC sections, section A phases are higher than C with B phase voltage amplitudes absolute value
Phase, if three roads apply PWM drive signal, A phases and D1 in the loop of B phases simultaneously, D5 is turned on by positive bias-voltage, and C phases D3
And D6 can not be turned on by reversed bias voltage, as shown in figure 4, Q1Q2, Q3Q4 are turned on, electric current passes through first switch unit and D1, Lr,
Tra, Cr, D5 form loop.When Q1Q2 driving or Q3Q4 driving are closed, then D3 or D6 can be turned on by positive bias-voltage
Form freewheeling path with resonant inductance Lr, in order to ensure PF values, C phases can only with the voltage turn-on of opposite direction amplitude, therefore together
First close to that phase voltage of amplitude (such as then closed in 30 ° -60 ° or AC-O sections, the driving of A phases prior to B, such as Fig. 5,
Electric current forms loop by first switch unit and D3, Lr, Tra, Cr, D5.60 ° -90 ° or O-BC sections, the driving of B phases are then first
Closed in A, such as Fig. 6, electric current forms loop by first switch unit and D1, Lr, Tra, Cr, D6.), the PWM first closed drives
We are designated as " small " to dynamic model formula, and the PWM drive patterns turned off afterwards are designated as " big ".
After the PWM driving voltages of AB two-phases are all closed, therefore inputting three-phase alternating current does not have any loop to turn on, now before
Electric current meeting nature afterflow in the loop of phase conducting, wherein Cp energy moment completes release, if C phase driving voltages are still deposited
Now, as shown in fig. 7, electric current can then be entered by D2+D5+Q7 (anti-and diode) or D1+D4+Q7 (anti-and diode)
Row afterflow；If C phases driving voltage is low level, inductive current can then pass through D1+D4+Q7 (anti-and diode) or D2+D5+
Q7 (anti-and diode) or D3+D6+Q7 (anti-and diode) carry out afterflow.
According to above operation principle, if the drivings of C phases is kept to (high level) be present always, or more than or equal to other two
Maximum PWM driving voltage in phase, such a driving condition can be abbreviated as " height ", i.e., now only need the drivings of AB two-phases according to
Control needs to send out the step-down rectifier that corresponding high-frequency PWM drive signal can realizes three-phase voltage, can simplify in the segment
Driving logic control method to first switch unit, while turn-on consumption can also be reduced；Meanwhile in the segment, each phase
Electric current can turn on, and be not in certain phenomenon that mutually stops in uncontrollable rectifier with arc in phase.Therefore driver element
PWM drive signal is modulated, it is possible to so that current waveform follows unanimously with voltage waveform, therefore can obtain higher
PF values, that is, realize PFC correcting functions.
After Q7 completes afterflow, now apply high level drive signal to Q7, due to resonant inductance Lr, Cr and transformer
The presence of primary side, thus electric current quickly can reverse resonance, as shown in figure 8, electric current entered Q7, Lr, Cr and transformer once
Side forms reverse resonant tank.Turned off according to control needs, then by Q7, cut off the path, while open first switch unit, made
The threephase AC electric energy of input forms loop.
Each mode of operation can carry out equivalent transformation to the circuit of the converter of this single-stage isolated type above：
As shown in figure 9, being simplified according to symmetry and switch functionality when the first switch unit conducting of certain two-phase
Afterwards such as Figure 10, the alternating current source for having diode under transient condition can be equivalent to DC source at this moment, while first switch unit also may be used
To be equivalent to a switch, therefore as shown in figure 11.Because Cp is foregoing each switching tube and diode parasitic capacitance, therefore can be with
It is equivalent to ignore, as shown in figure 12.
Carry out it is above-mentioned it is equivalent after, the actual series resonant circuit (LLC circuits) that can be regarded as an isolated form of the circuit,
In summary, the whole work for inputting first switch unit can be in equivalent serial resonant circuit diagram a work bridge arm, Q7 is then
Represent another pattern, if it is desired to which Q7 shut-off is Sofe Switch or close to Sofe Switch, then should try one's best makes the of input
One switch element dutycycle is no more than 50%, and is approached with Q7 dutycycle.So in " PWM " pattern in ABC three-phases most
Big space rate is 50% or so.So the maximum duty cycle most preferably 0.5 of the first switch unit of input, with second switch unit
Q7 forms complementation, and realizes output voltage stabilization by regulating frequency, when input voltage exceedes certain limit or underload
When, then by the maximum duty cycle of the first switch unit of input most preferably reduce or deviate 0.5；As shown in figure 16, afterflow electricity
Sense L2 may or may not be present, if the dutycycle of first switch unit is always below 0.5, have the afterflow inductance for most
It is good.
It can be seen that the converter circuit of this isolated form realizes the similar principles of series resonant circuit, simultaneously because first switch
The Active PFC function that unit plays, that is to say, that this converter, just realized by single stage circuit structure and control method
Multiple functions, eliminate many power components, while realize Sofe Switch again, and the loss of switch is smaller, are adapted to high power close
The occasion of degree, the converter circuit of this isolated form can utilize the similar principles of series resonant circuit, change working frequency, so as to
To realize that voltage stabilizing of the secondary output circuit under different loads and different input voltages exports, when input and loading condition deviate
After certain frequency shift scope, the mode for changing dutycycle is recycled to be adjusted, to ensure maximum Sofe Switch
Work.
Compared to existing Cycloconverter, single-stage converter conception is equally realized, it is more intersecting than traditional three
Circuit reduction is realized on the basis of current converter, while also achieves Sofe Switch, the present invention is not only defeated in preferable three-phase alternating current
Energy normal work under the conditions of entering, because three switches sets of first switch unit can meet under any three-phase alternating current input condition,
When the three-phase alternating-current supply of input will can pass through resonant inductance Lr, transformer, Cr formation loops, two-phase switches set has at least been needed to open
Open, so in the case where saltus step or polarity mutation occurs in input voltage, it is not easy to form reverse spike voltage and electric current falls
Fill, small is required to detecting protection, the algorithm of control can be simpler, it is really promoted reference on a large scale.
To sum up, from structure, the present invention changes the implementation method that traditional pfc circuit adds DC-isolation translation circuit,
By the topological structure of the present invention, the energy-storage units that can be saved after the AC rectification of conventional AC/DC convertor, while also may be used
The power device and drive circuit of DC-isolation conversion are saved, whole ac-dc conversion circuit is simple, and control logic is simplified, effect
Rate is high, is suitable for high efficiency and high power density demand occasion；
Functionally, relative to traditional isolated form three-phase AC/DC conversion device with Active PFC function and
Speech, by primary conversion circuit be achieved that AC-DC conversion function, Active PFC function, isolated variable, Sofe Switch with
And voltage regulation function, many power rate devices can be saved, while compared to the Cycloconverter being previously mentioned, due to three-phase
The input of three line power supplys can form loop between the two phases, and conducting is no longer a phase switches set every time, can successfully manage input
There is the situation of saltus step or polarity mutation in voltage, and its grid adaptability is stronger, and job stability is higher, and equipment quality more may be used
Lean on.
From control, the arithmetic speed of DSP control unit with simplify control algorithm, can be improved, is grasped from the switch of PFC functions
From the point of view of making, by applying the drive signal of " height " driving condition to one of switches set, PWM is carried out to other two switches sets
The drive signal of driving condition, thus, can simplify control method, realize high PFC, low THDI.From coming for the angle of Sofe Switch
See, it is only necessary to adjust first switch unit and second switch unit for 0.5.From the angle of load, because realizing series resonance
The function of circuit, so using the similar principles of series resonant circuit, change working frequency, so as to realize that secondary exports
Voltage stabilizing output of the circuit under different loads and different input voltages, when input and loading condition deviate certain frequency shift
After scope, the mode for changing dutycycle is recycled to be adjusted, to ensure that maximum Sofe Switch works.
For other segments, by that analogy, BC-BA sections, the drive signals of B phases is high driving condition, AC two
The drive signal of phase is PWM drive signal, BC-O sections, and the driving of C phases then closes prior to A, O-BA sections, the driving of A phases
Then closed prior to C；
BA-CA sections, the drive signals of A phases are high driving condition, and the drive signals of BC two-phases is PWM drive signal, BA-
O sections, the driving of B phases then close prior to C, and O-CA sections, the driving of C phases then closes prior to B.
CA-CB sections, the drive signals of C phases are high driving condition, and the drive signals of AB two-phases is PWM drive signal, CA-
O sections, the driving of A phases then close prior to B, and O-CB sections, the driving of B phases then closes prior to A.
CB-AB sections, the drive signals of B phases are high driving condition, and the drive signals of AC two-phases is PWM drive signal, CB-
O sections, the driving of C phases then close prior to A, and O-AB sections, the driving of A phases then closes prior to C.
AB-AC sections, the drive signals of A phases are high driving condition, and the drive signals of BC two-phases is PWM drive signal, AB-
O sections, the driving of B phases then close prior to C, and O-AC sections, the driving of C phases then closes prior to B.
Because three-phase voltage might not be completely preferable in reality, the change of phase, amplitude, direction be present, can only basis
Actual lock mutually judges to produce the drive waveforms of each segment, therefore should be judged with the feature of each drive waveforms of segment,
Without being represented with desired angle, according to the characteristics of 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 drive signal, the second drive signal and the 3rd drive signal, wherein, same
Under one segment, " height " is the first drive signal, and other two PWM drive signals are the second drive signal and the 3rd driving letter
Number, it is the drive signal waveform logical table of Q1Q2, Q3Q4, Q5Q6 in a cycle in summary.
Table one, drive waveforms logical table
It can be obtained according to each segment of drive waveforms logical table, can perform following control method：
Input/output condition is detected, judges whether input/output condition meets condition of work, the condition of being unsatisfactory for continues waiting for；
If meeting condition, start working, it is necessary to carry out lock phase processor to the phase three-wire three power supply voltage signal of input, judge three-phase three
Phase and segment residing for the current time of line power supply；To in the first switch unit under current interval section, corresponding to voltage
Switches set on the minimum phase line of amplitude absolute value, applying control, it is constantly in the first of conducting state in segment
Drive signal, and apply the second drive signal for carrying out PWM controls and the 3rd driving letter to the switches set on other two phase line
Number, and the fourth drive signal of PWM controls is carried out to second switch unit so that conducting can be formed between phase three-wire three power supply
Loop, and when not forming conducting loop, afterflow and reverse resonance are realized by second switch unit.
The second drive signal, the 3rd drive signal and the fourth drive signal of PWM controls are carried out, further according to voltage signal
Zero crossing " O ", 6 original segments are divided into 12 segments, duty ratio corresponding is performed according to this 12 segments
Drive signal, as shown in figure 13, by taking ACO segments as an example, first drive of " height " driving condition is can perform for the switches set of C phases
Dynamic signal so that the phase line is constantly on；For the switches set on other two phase line, it is inconsistent that dutycycle each other will be accommodated
PWM drive signal, in this segment, the PWM drive signals of B phases is the 3rd drive signal of " big " driving condition, A phases
PWM drive signal is second drive signal of " small " driving condition, and as shown in figure 13, the 3rd drive signal dutycycle is more than second
The dutycycle of drive signal, it can realize that the switches set of A phases is first closed, be closed after the switches set of B phases, to keep working as A, B, C three-phase
First switch unit accommodated PWM drive signal after, A, B, C of the three-phase alternating current of input can be orderly between different phase roads
Different loops is switched to, avoids uniline from accessing, improves power network adaptive faculty, and forms afterflow, realizes PFC functions；Meanwhile
It can realize and be turned off in A phases and B phases, after the switches set of A phases and B phases is turned off, although the switches set of C phases keeps open-minded,
But the three-phase alternating-current supply of input can not be made to form loop, now, with " big " driving condition, i.e., second switch unit is applied
The complementary fourth drive signal with the 3rd drive signal, when the three-phase alternating-current supply of input can not be made to form loop, 4 wheel driven
Dynamic signal turns on after causing Q7 afterflows, forms reverse resonance path, so as to form LLC circuits, forms Sofe Switch, reduces power member
The switching loss of part；Each switches set and second switch unit the first drive signal, the second drive signal, the 3rd drive signal and
Under the control of fourth drive signal, switching manipulation corresponding to realization.As shown in figure 13, the sequential under 12 different sections is summarized
Figure, the dutycycle driven to different segment regulation regulations, i.e.,：
In the segment, in other two phase line, voltage direction that phase minimum with voltage magnitude absolute value
Switches set on the phase line of circuit identical one applies second drive signal, described in the different switches set of voltage direction applies
3rd drive signal, the dutycycle of second drive signal are less than the dutycycle of the 3rd drive signal, and the described 4th
The dutycycle of drive signal is identical with the dutycycle of the 3rd drive signal.
It can be carried out using the above method according to following alternating mode：
If three switches sets that some time inscribes first switch unit are both turned on, then second switch unit can not turn on, this
Pass through rectification unit, series resonance unit, transformation between two phase lines where two switches sets that PWM described in Shi Jinhang is controlled
The primary side of device forms loop；
During subsequent time, continue to control the second switch unit to be not turned on, by the first switch unit, voltage side
Closed to the switches set on the phase line of phase line identical one minimum with voltage magnitude absolute value, the different switch of voltage direction
Group maintains conducting so that maintains between a phase line of conducting and the phase line that voltage magnitude absolute value is minimum by rectification list
Member, the primary side of series resonance unit, transformer form loop；
Go successively to next moment, second switch unit, series resonance unit, transformer primary side afterflow after control
The second switch unit conducting, the switches set that last moment maintains conducting is closed, the switches set for now carrying out PWM controls is equal
Close, loop is formed by the primary side of second switch unit, series resonance unit, transformer.
Subsequent time, second switch unit is closed, by a phase voltage direction identical minimum with voltage magnitude absolute value
The switches set of one phase line remains turned-off, and voltage direction difference switches set turns on again, the phase line and voltage turned on again
Loop is formed between the minimum phase line of amplitude absolute value.
Subsequent time is entered back into, closes second switch unit, by a phase voltage direction minimum with voltage magnitude absolute value
The switches set of the phase line of identical one is opened, and voltage direction difference switches set is kept it turned on, and now, the switches set on three-phase is opened
Open, form loop between two phase lines where two switches sets of progress PWM controls, thus circulate.
Corresponding A CO segments, when just starting, Q7 is closed, and A phases and B are conducted, and forms loop；Immediately, because A phases drive
Signal dutyfactor is small, and A phases are first closed, and B phases are conducted with C, and now Q7 continues to close；Then, both are turned off, into afterflow shape
State, Q7 is opened after afterflow；Because B phase drive signal dutycycles are big, subsequent B phases are first opened, and B phases are conducted with C, form loop,
Now Q7 is closed；Subsequent A phases and B phases are opened, and A phases and B are conducted, and now Q7 continues to close；So circulation, until ACO areas
Between section terminate, into after next segment, according to the characteristics of OBC segments, change dutycycle.
The high driving condition of first drive signal is existing high level always, or first drive signal is
PWM drive signal, its driving voltage are more than the driving voltage of second drive signal and the 3rd drive signal；Driven on " height "
It is high level always that dynamic state, which is, or depends primarily on output loading with the dutycycle of " big " state consistency, and its otherness exists
In influence of the relative fluctuation to load of output voltage, the present embodiment is isolated form load, then " high " state can always be
High level or the PWM drive signal with " big " state consistency.
Embodiment 2：
As shown in figure 14, the present embodiment proposes a kind of variant embodiment of the pfc converter according to embodiment 1, two
Isolated form Three-phase PFC parallel connection (or crisscross 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 drive signals half of high frequency period of work schedule misphase, then be crisscross parallel, can so make front end
Continuous input current, and improve EMI.
Embodiment 3：
As shown in figure 15, the present embodiment proposes a kind of variant embodiment of the pfc converter according to embodiment 1, two
Either the isolated form Three-phase PFC of the above is in parallel or crisscross parallel is illustrated, and passes through controlling party described described in embodiment 1
Method is controlled to the Three-phase PFC that at least two are connected in parallel respectively, and the present embodiment can be equivalent to series resonant full bridge,
Converter A and converter B half of high frequency period of operating phase misphase, while Q7A and Q7B is respectively 50% dutycycle, so A roads
First switch unit (Q1AQ2A, Q3AQ4A, Q5AQ6A) conducting when pass through Q7B formed loop, B roads first switch unit
Loop is formed by Q7A when (Q1BQ2B, Q3BQ4B, Q5BQ6B) is turned on.
It would be recognized by those skilled in the art that it is possible that numerous accommodations are made to above description, so embodiment is only
For describing one or more particular implementations.
Although having been described above and describing the example embodiment for being counted as the present invention, it will be apparent to those skilled in the art that
It can be variously modified and replaced, without departing from the spirit of the present invention.Furthermore it is possible to many modifications are made with by spy
Condition of pledging love is fitted to the religious doctrine of the present invention, without departing from invention described herein central concept.So the present invention is unrestricted
In specific embodiment disclosed here, but the present invention all embodiments that may also include belonging to the scope of the invention and its equivalent
Thing.
Claims (13)
- A kind of 1. single-stage isolated type Three-phase PFC, it is characterised in that：It is defeated including primary side input circuit, transformer and secondary Go out circuit, the primary side input circuit includes first switch unit, the first rectification unit, second switch unit, series resonance list Member；The first switch unit includes three switches sets, and three switches sets are separately positioned on the phase three-wire three power supply of access Three phase lines on；Three switches sets are connected by three phase lines with first rectification unit respectively；Described first is whole Flow unit and connect the second switch unit and the series resonance unit concatenated with one another, the primary side of the transformer, institute The secondary side for stating transformer is connected with secondary output circuit.
- 2. Three-phase PFC as claimed in claim 1, it is characterised in that：The switches set include the first power switch and Second power switch；First power switch and second power switch are driven by same drive signal；Or, First power switch and second power switch are driven each via independent drive signal.
- 3. Three-phase PFC as claimed in claim 1, it is characterised in that：The secondary output circuit includes the second rectification Unit, second rectification unit can be voltage multiplying rectifier, full-wave rectification or full-bridge rectification.
- 4. Three-phase PFC as claimed in claim 3, it is characterised in that：The secondary output circuit also continues including energy storage Unit is flowed, the energy storage afterflow unit is not provided with afterflow inductance, sets filter capacitor, the filter capacitor and second rectification Unit simultaneously connects；It is concatenated with one another or the energy storage afterflow unit sets at least one afterflow inductance and at least one filter capacitor At least one afterflow inductance is connected with least one filter capacitor with second rectification unit.
- 5. Three-phase PFC as claimed in claim 2, it is characterised in that：First power switch, second power Switch and the second switch unit are that metal-oxide-semiconductor or IGBT are managed.
- 6. Three-phase PFC as claimed in claim 1, it is characterised in that：The series resonance unit includes at least one Resonant inductance and at least one resonant capacitance, the resonant inductance are connected in series with the resonant capacitance.
- 7. Three-phase PFC as claimed in claim 1, it is characterised in that：The primary side input circuit also includes input filter Ripple device, the input filter are arranged on the first switch unit front end, and phase three-wire three power supply is after input filter filters Access the first switch unit.
- A kind of 8. single-stage isolated type Three-phase PFC, it is characterised in that：Including at least two such as any institutes of claim 1-7 The pfc converter stated, connected with parallel or crisscross parallel between each pfc converter.
- 9. a kind of control method for any described single-stage isolated type Three-phase PFCs of claim 1-7, its feature exists In comprising the following steps：Input/output condition is detected, judges whether input/output condition meets condition of work, the condition of being unsatisfactory for continues waiting for；If Meet condition, start working, lock phase processor is carried out to the phase three-wire three power supply voltage signal of input, judges phase three-wire three power supply Phase and segment residing for current time；To in the first switch unit under current interval section, corresponding to the switch on the minimum phase line of voltage magnitude absolute value Group, applying control, it is constantly in the first drive signal of conducting state in segment, and to opening on other two phase line Pass group applies the second drive signal and the 3rd drive signal for carrying out PWM controls, and carries out PWM controls to second switch unit Fourth drive signal so that conducting loop can be formed between phase three-wire three power supply, and when not forming conducting loop, by the Two switch elements realize afterflow and reverse resonance.
- 10. Three-phase PFC control method as claimed in claim 9, it is characterised in that：The first drive signal applied For：Existing high level signal always；Or PWM drive signal, the driving voltage of the PWM drive signal are more than described second and driven The driving voltage of dynamic signal and the 3rd drive signal.
- 11. Three-phase PFC control method as claimed in claim 9, it is characterised in that：It is described in the segment In other two phase line, the switches set on voltage direction that phase line of phase line identical one minimum with voltage magnitude absolute value Apply second drive signal, the different switches set of voltage direction applies the 3rd drive signal, the second driving letter Number dutycycle be less than the 3rd drive signal dutycycle, and the dutycycle of the fourth drive signal with the described 3rd drive The dutycycle of dynamic signal is identical.
- 12. the Three-phase PFC control method as described in claim 9-11 is any, it is characterised in that：3rd driving The dutycycle of signal is not more than 0.5, and the dutycycle of the 3rd drive signal dutycycle and fourth drive signal forms complementation.
- 13. the control method of a kind of single-stage isolated type Three-phase PFC for described in claim 8, it is characterised in that logical Any described control methods of claim 9-12 are crossed respectively to control the Three-phase PFC that at least two are connected in parallel System, the operating phase of at least two Three-phase PFCs being connected in parallel differ half of high frequency period.
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| CN201710970362.7A CN107800309A (en) | 2017-10-16 | 2017-10-16 | A kind of single-stage isolated type Three-phase PFC and its control method |
| PCT/CN2017/112382 WO2019075837A1 (en) | 2017-10-16 | 2017-11-22 | Single-stage isolated three-phase pfc converter and control method therefor |
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| CN201710970362.7A CN107800309A (en) | 2017-10-16 | 2017-10-16 | A kind of single-stage isolated type Three-phase PFC and its control method |
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| CN109120165A (en) * | 2018-11-06 | 2019-01-01 | 深圳市高益智能电气有限公司 | A kind of isolated form three-phase AC/DC conversion device and its control method |
| CN111726021A (en) * | 2020-07-27 | 2020-09-29 | 西南交通大学 | Method for controlling bidirectional energy storage converter and bidirectional energy storage converter |
| CN113556052A (en) * | 2021-07-23 | 2021-10-26 | 重庆和诚电器有限公司 | Control method of MOS switch type voltage regulator for motorcycle |
| CN113659857A (en) * | 2021-07-02 | 2021-11-16 | 杭州中恒电气股份有限公司 | Ripple wave suppression method of three-phase LLC resonant converter |
| CN114362543A (en) * | 2022-01-13 | 2022-04-15 | 南京航空航天大学 | Three-phase single-stage resonance transformation device |
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| WO2019075837A1 (en) | 2019-04-25 |
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