CN209105053U - A kind of isolated form three-phase AC/DC conversion device - Google Patents
A kind of isolated form three-phase AC/DC conversion device Download PDFInfo
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- CN209105053U CN209105053U CN201821823037.4U CN201821823037U CN209105053U CN 209105053 U CN209105053 U CN 209105053U CN 201821823037 U CN201821823037 U CN 201821823037U CN 209105053 U CN209105053 U CN 209105053U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a kind of isolated form three-phase AC/DC conversion devices, including primary side input circuit, transformer and secondary side output circuit, primary side input circuit includes input switch unit, the first rectification unit, auxiliary converting circuit, continued flow switch unit, series resonance unit；Three switching tubes of input switch unit are separately positioned in three phase lines of the phase three-wire three power supply of access, are also connect respectively by three phase lines with the first rectification unit；First rectification unit, auxiliary converting circuit, continued flow switch unit and series resonance unit are in parallel, and the first siding ring of transformer accesses series resonance unit, and the second siding ring of transformer is connect with secondary side output circuit.The utility model has the advantages of simple structure, realizes AC-DC conversion function, Active PFC function, isolated variable, Sofe Switch and voltage regulation function, saves traditional ac-dc conversion circuit rate device, reduces switch change-over link, be suitable for high power density occasion.
Description
Technical field
The utility model relates to power electronics fields, more particularly to a kind of isolated form three-phase AC/DC conversion device.
Background technique
As monomer electrical equipment power is increasing, the mode of single phase power supply is mostly used gradually to change using three greatly originally
It mutually powers, if very big, even meeting when serious will be destroyed to the power quality of power grid without power factor correction (PFC) function
Lead to the paralysis of power grid.Therefore, the ac-dc conversion circuit inputted for three-phase alternating current, generally PFC+DC/DC two-stage circuit,
Since the subsequent voltage of PFC rectification is higher, thus cause entire circuit design complex；Therefore also there are foreign countries same before
Row proposed the three-phase AC/DC conversion device of single-stage, such as the single-revolution converter that everybody is familiar with, such as utility model patent
WO2008/018802A2 is more typical high efficient three-phase exchange single-stage converter, as shown in Figure 1, the circuit is traditional
Circuit reduction is realized on the basis of three-phase alternating current converter, while also achieving Sofe Switch, but since grid adaptability etc. is more
Aspect reason causes control algolithm complicated, which does not promote the use of product on a large scale.Simultaneously as shown in Figure 2 circuit and should
Other schemes mentioned in utility model, performance loop device is more or circuit is complicated, and exchange side switch is constantly in be opened firmly
Working condition is closed, conduction loss is big；If Cp is smaller simultaneously opens moment in alternating-current switch or Q7 shutdown moment easily causes
High pressure spike, thus the Q7 after damaging rectifier bridge, if Cp is excessive, switching moments energy also has greatly damage Q7 risk, simultaneously
Also result in inefficiency.Furthermore in the case where electrical network parameter changes or loads situation of change, Q7 is also difficult to meet Sofe Switch condition.
Utility model content
The utility model aim is to propose a kind of isolated form three-phase AC/DC conversion device, be deposited with solving the above-mentioned prior art
Structure and control method it is complicated caused by the limited technical problem of application.
For this purpose, the utility model proposes a kind of isolated form three-phase AC/DC conversion device, including primary side input circuit, transformation
Device and secondary side output circuit, primary side input circuit includes input switch unit, the first rectification unit, auxiliary converting circuit, afterflow
Switch unit, series resonance unit；Input switch unit includes first switch tube, second switch and third switching tube, described
First switch tube, second switch and third switching tube are separately positioned in three phase lines of the phase three-wire three power supply of access, also
It is connect respectively by three phase lines with the first rectification unit；First rectification unit, auxiliary converting circuit, continued flow switch unit and string
Join resonant element parallel connection, the first siding ring of transformer accesses series resonance unit, and the second siding ring of transformer and secondary side are defeated
Circuit connection out.
The beneficial effect that the utility model is compared with the prior art includes:
From structure, the utility model changes the implementation method that traditional pfc circuit adds DC isolation translation circuit, leads to
The topological structure for crossing the utility model overcomes the disadvantage that traditional boost PFC circuit rear end high pressure and switching tube should be opened
End, so that the loss of input switch pipe reduces, the restricted gender of the connection power device of rear end is reduced, and optional leeway is bigger；Simultaneously
The utility model proposes level-one ac-dc conversion circuit, entire ac-dc conversion circuit is simple, and control logic is simplified, and is doing work
While rate factor correction, have been completed that a part of isolation ac-dc conversion (is equivalent to the half change of bridge circuit
Change), reduce power switch step, therefore high-efficient, is suitable for high efficiency and high power density demand occasion；Functionally,
For traditional isolated form three-phase AC/DC conversion device with Active PFC function, pass through primary conversion circuit
It is achieved that AC-DC conversion function, Active PFC function, isolated variable, Sofe Switch and voltage regulation function, can save
Many power devices, while compared to the single-revolution converter being previously mentioned, since transformation loop is become from single-phase with capacitor midpoint
It is formed into a loop between the practical two-phase of phase three-wire three power input, conducting is no longer a phase switching group every time, can be successfully managed
Input voltage occurs jumping or the case where polarity mutation, and grid adaptability is stronger, and job stability is higher, and equipment quality is more
Add reliable.
Detailed description of the invention
Fig. 1 is existing high efficient three-phase exchange single-stage converter (single-revolution converter) structural schematic diagram.
Fig. 2 is the schematic diagram of another known isolated form three-phase AC/DC conversion device.
Fig. 3 is the schematic diagram of the isolated form three-phase AC/DC conversion device of the utility model embodiment 1.
Fig. 4 is that the three-phase voltage waveform signal of the utility model embodiment 1 and joint define schematic diagram.
Fig. 5 be the utility model embodiment 1 the section AC-BC AB to conducting circuit diagram.
Fig. 6 is the AC-BC interval B C phase continuous current circuit schematic diagram of the utility model embodiment 1.
Fig. 7 is the section the AC-BC forward direction inductive current continuous current circuit schematic diagram of the utility model embodiment 1.
Fig. 8 is reversed freewheeling current path schematic diagram after the section the AC-BC Q8 of the utility model embodiment 1 is connected.
Fig. 9 is the instantaneous freewheeling path schematic diagram after Q8 closing of the utility model embodiment 1.
Figure 10 is the instantaneous freewheeling path schematic diagram after Q7 is opened of the utility model embodiment 1.
Figure 11 is the section the AC-BC AC phase continuous current circuit schematic diagram of the utility model embodiment 1.
Figure 12 is the equivalent transformation signal 1 of the utility model embodiment 1.
Figure 13 is the equivalent transformation signal 2 of the utility model embodiment 1.
Figure 14 is the equivalent transformation signal 3 of the utility model embodiment 1.
Figure 15 is the equivalent transformation signal 4 of the utility model embodiment 1.
Figure 16 is each drive mode figure under 12 segments in the utility model embodiment 1.
Figure 17 is certain moment driving logical schematic of the utility model embodiment 1.
Figure 18 is the structural schematic diagram of the variant embodiment 2 of the utility model embodiment 1.
Figure 19 is the structural schematic diagram of the variant embodiment 3 of the utility model embodiment 1.
Specific embodiment
With reference to embodiment and compares attached drawing the utility model is described in further detail.It should be emphasized that
It is that following the description is only exemplary, rather than in order to limit the scope of the utility model and its application.
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 3, the present embodiment proposes a kind of isolated form three-phase AC/DC conversion device, including primary side input circuit 1,
Transformer 2 and secondary side output circuit 3, primary side input circuit 1 include input switch unit 11, the first rectification unit 12, auxiliary change
Change circuit 13, continued flow switch unit 14, series resonance unit 15；Input switch unit 11 includes switching tube Q1, second switch
Q2 and third switching tube Q3, the first switch tube Q1, second switch Q2 and third switching tube Q3 are separately positioned on access
In three phase lines of phase three-wire three power supply, also it is connect respectively by three phase lines with the first rectification unit 12；First rectification unit
12, auxiliary converting circuit 13, continued flow switch unit 14 and series resonance unit 15 are in parallel, the first siding ring access of transformer 2
Series resonance unit 15, the second siding ring of transformer 2 are connect with secondary side output circuit 3.
Specifically, the first rectification unit 12 is three phase rectifier switch unit, for executing AC rectification operation, the transformation
Device 2 executes isolation and transformation operation, the input switch unit 11 and the first rectification unit 12 both for execute AC power because
Element corrects switch operation, and cooperates the series resonance unit, the transformer 2 and execute equivalent half-bridge circuit forward direction resonance and lead to
Way switch operation, the continued flow switch unit 14 are a switching tube, are executed reversed after input switch unit 11 is all closed
The operation of resonance channel selector, completes the function of the resonant transformation of equivalent half-bridge circuit together.
As shown in figure 3, phase three-wire three power supply includes A phase, B phase and C phase, three-phase alternating voltage signal can refer to Fig. 4,
120 degree of phase is differed each other, since the power supply signal that actually enters is there may be jumping or polarity mutation, so this reality
The voltage waveform exemplified is applied for the ease of describing hereinafter, using the waveform of standard as reference.Primary side input circuit further includes defeated
Enter filter, the input filter is arranged in first switch unit front end, and phase three-wire three power supply is after input filter filters
First switch unit is accessed, in order to be greatly attenuated the EMI signal being passed to through power supply, protects equipment from its evil, as shown in Fig. 2,
The present embodiment is electromagnetic interface filter in the input filter of phase three-wire three input terminal, and electromagnetic interface filter can efficiently control equipment sheet
The electromagnetic interference signal that body generates enters power grid, pollutes electromagnetic environment, endangers other equipment, and in the present embodiment, other accommodations are implemented
In example, other kinds of filter can also be.
Specific circuit structure is as follows: the first rectification unit 12 includes diode D1-D6, switching tube Q4-Q6, householder transformation
Circuit 13 includes switching tube Q7, the 8th diode D8, the 8th resistance R8 and first capacitor C1, and continued flow switch unit includes the 8th
Switching tube Q8, series resonance unit include at least one first inductance Lr, the second inductance Lm and the second capacitor Cr；
The source electrode of switching tube Q1-Q3 is separately connected three-phase alternating current input terminal, and the drain electrode of switching tube Q1-Q3 is separately connected rectification
Three input terminals of unit 12, the cathode of first diode D1, the second diode D2 cathode, the cathode of third diode D3,
One end of the drain electrode of seven switching tube Q7, the source electrode of the 8th switching tube Q8 and the first inductance Lr connects, the anode of the 4th diode D4,
The drain electrode and second of one end, the 8th switching tube Q8 of the 5th diode D5 anode, the anode of the 6th diode D6, first capacitor C1
One end of capacitor Cr connects, and the source electrode of the 4th switching tube Q4 connects the cathode of the 4th diode D4, the source electrode of the 5th switching tube Q5
The cathode of the 5th diode D5 is connected, the source electrode of the 6th switching tube Q6 connects the cathode of the 6th diode D6, the 4th switching tube Q4
Drain electrode connection first diode D1 anode and first switch tube Q1 drain electrode, the 5th switching tube Q5 source electrode connection the two or two
The drain electrode of the anode and second switch Q2 of pole pipe D2, the anode and the of the source electrode connection third diode D3 of the 6th switching tube Q6
The drain electrode of three switching tube Q3, the 8th diode D8 is in parallel with the 8th resistance R8, and the cathode of the 8th diode D8 connects the 7th switching tube
The anode of the source electrode of Q7, the 8th diode D8 connects one end of first capacitor C1, at least one first inductance Lr, the second inductance Lm and
Second capacitor Cr is serially connected, and the second inductance Lm is the inductance for being directly integrated in inside transformer, i.e. transformer 2 a side line
Enclose inductance, or the independent external inductance in parallel with 2 first siding ring of transformer.
Pair side output circuit 3 includes the second rectification unit 31, the second siding ring of the transformer 2 and described second
Two input terminals of rectification unit 31 connect, and second rectification unit 31 can be voltage multiplying rectifier, full-wave rectification or full-bridge rectification.
Pair side output circuit 3 further includes energy storage afterflow unit 32, the both ends of the energy storage afterflow unit 32 and second rectification
Two output ends of unit 31 connect, and the energy storage afterflow unit 32 includes at least one third inductance L2 being serially connected and extremely
A few third capacitor C2.
Specifically, as shown in figure 3, the secondary side of transformer Tra, is a typical full bridge rectifier, including two poles
Pipe D11, D12, D13, D14, the cathode of D11 and the cathode of D12 connect the one end galvanic electricity sense L2, the anode of D13 and the anode of D14
With the negative terminal of capacitor C2, one end of the cathode connection Tra secondary side of the anode and D13 of D11, the anode of D12 and the cathode of D14 connect
Connect the other end of Tra secondary side；In the present embodiment, the secondary side output rectification circuit of transformer can also be other circuits,
Such as voltage multiplying rectifier, full-wave rectification and full-bridge rectification；Afterflow inductance L2, filter capacitor C2 constitute the energy storage afterflow list of secondary side
Member, energy storage afterflow unit can be not provided with afterflow inductance L2, and filter capacitor C2 is only arranged, and the rectification of filter capacitor C2 and second is single
Member simultaneously connects, or at least one afterflow inductance L2 and at least one filter capacitor C2 is arranged, at least one afterflow electricity concatenated with one another
Sense L2 is connect at least one filter capacitor C2 with secondary side rectification circuit.
The utility model embodiment provides a kind of control method for above-mentioned isolated form three-phase AC/DC conversion device, special
Sign is, comprising the following steps: is being worked as according to each phase power supply of the locking phase discriminatory analysis of the phase three-wire three power supply voltage signal of input
Phase locating for the preceding moment and segment；To the switching tube in the input switch unit and the first rectification unit under current interval section
All apply PWM drive signal, the two-phase in three-phase is made to form current loop by the first rectification unit and series resonance unit；It will
The lower phase access shutdown of amplitude absolute value, other two-phases continue to current loop in the two-phase of conducting；Shutdown input is opened
The driving signal of unit, the first rectification unit and the switching tube in auxiliary converting circuit is closed, and applies to continued flow switch unit and drives
Dynamic signal, realizes the conducting of afterflow and reverse current circuit；The driving signal of continued flow switch unit is closed, and in householder transformation electricity
Road applies driving signal to input switch unit, the first rectification unit and auxiliary converting circuit after starting to charge.
Specifically, input B represents input B phase (Phase B) as shown in figure 4, input A represents input A phase (Phase A),
It inputs C and represents input C phase (Phase C)；For the convenience of description, set three-phase voltage differ 120 °, and be sinusoidal voltage, every 360 °
One circulation；In view of stating intuitive and convenient, with 30 ° to 390 ° (30 ° of points in next period) for a complete cycle, therefore such as
Shown in Fig. 5, 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 " 0 " point.
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, Q1Q4, Q2Q5 simultaneously, Q3Q6 is opened, A phase and D1 in the circuit of B phase, D5 by
Positive bias-voltage and be connected, and other diodes on C phase D3 and D6 and input rectifying bridge cannot be connected by reversed bias voltage,
As shown in figure 5, electric current passes through Q1 and D1, Lr, Tra first siding ring (including Lm), Cr, D5, Q5, Q2 forming circuit.If this
When moment have more than the anti-and diode that can then lead to Q7 of C1 voltage and series resistance constitutes circuit and is absorbed, to allow spike
Voltage is able to strangulation；When the driving of excessive Q1Q4 is closed, then the freewheeling path of composition with B phase can be connected by positive bias-voltage by D3, be
Guarantee PF value, C phase can only be with the voltage turn-ons of opposite direction amplitude, therefore that phase voltage of amplitude is first closed (such as in the same direction
In 30 ° -60 ° or the section AC-0, the driving of A phase is then closed prior to other two-phase, such as Fig. 5, and electric current passes through Q3 and D3, Lr, Tra,
Cr, D5, Q5, Q2 forming circuit.60 ° -90 ° or the section 0-BC, the driving of B phase are then closed prior to other two-phase, such as Figure 11, electric current
By first switch unit and Q1, D1, Lr, Tra, Cr, D6, Q6, Q3 forming circuit.)；The circuit compares circuit shown in Fig. 2
A switching tube is considerably reduced from the device work in circuit, therefore, conduction loss can significantly reduce；In addition, conducting electric current
Time and phase voltage amplitude at relativeness, i.e. amplitude absolute value is higher, and the current lead-through time is longer, and electricity may be implemented
Stream waveform follows voltage waveform to realize PFC function；The current lead-through time of amplitude maximum absolute value phase, it is exhausted to be equal to the amplitude simultaneously
To the sum for being worth relatively low biphase current turn-on time.
From the foregoing, it will be observed that the control method realizes every Xiang Junke with conducting electric current to realize high PF value in each switch periods
And the crucial factor of low THDI is, elder generation is higher by amplitude and opposite polarity two are conducted, and the energy storage on the inductance in circuit,
Then close makes its freewheel current pass through width with the access of the minimum same direction of amplitude absolute value (switching tube closed in circuit)
It is worth the minimum phase of absolute value, therefore in each switch periods, the current loop of two-phase amplitude higher phase in the same direction can be closed first, first be closed
The PWM drive mode closed is denoted as " short ", and the PWM drive mode turned off afterwards is denoted as " length ".I.e. in the practical control of the embodiment,
The duty ratio in each period only can be there are two types of numerical value under normal circumstances.The specific duty ratio size of " length " " short " PWM drive signal
Then determined by real-time control operation result.
In addition, if can also be adopted in the case where not considering that control complexity only needs to realize effect same as before
Do not apply driving signal simultaneously with the switching tube that another control model is connected with three-phase alternating current, first and polarity higher to amplitude
Opposite two-phase applies signal and turns it on, before then closing the access with the minimum same direction of amplitude absolute value and opening not
The switch on ac circuit opened makes its freewheel current by the minimum phase of amplitude absolute value, therefore in each switch periods, and two
The current loop of phase amplitude higher phase in the same direction can be closed first, the PWM drive mode first closed be denoted as " short 1 ", after the PWM that opens
Drive mode is denoted as that " short 2 ", the PWM drive mode first opened and finally turned off are denoted as " length ".This kind of mode its without departing from me
" length " above-mentioned " short " control strategy, therefore below be not described in detail.
After the PWM driving voltage of the switching tube on three-phase circuit is all closed, therefore input three-phase alternating current does not have any time
Road is connected, and electric current meeting natural afterflow because of the presence of inductance in the circuit of conducting early period at this time, starting can be by being released back into
The parasitic capacitance of the devices such as diode in road, wherein the energy moment of parasitic capacitance completes after discharging, Q8 anti-parallel diodes
Then can natural positively biased it is open-minded, as no-voltage is open-minded, can (include by Lr, Tra first siding ring if Fig. 7 inductive current
Lm), Cr, Q8 (anti-and diode) carry out afterflow.Before address and describe anti-and diode after text and refer to that switching tube is integrated or posts
Raw backward dioded is also possible to additional independent diode.After Q8 diode current flow completes afterflow, do not cut in diode
Before only, applies driving signal to Q8 and carry out open-minded, switching tube is then that no-voltage is open-minded；Due to resonant inductance Lr, Cr and transformation
The presence of device primary side, thus electric current quickly can reversed resonance, as shown in figure 8, electric current is into crossing Q7, Lr, Cr and transformer one
Secondary side forms reversed resonant tank.
Such as Fig. 9, according to control needs, when reversed resonant tank needs to close, then Q8 is turned off, cut off the access, then return
Road electric current will first in loop with Q8 equivalent parallel (or parasitic) capacitor charging, voltage lifting step by step, due to the presence of C1,
When the voltage of parasitic capacitance is more than C1 voltage in loop, then it can make the anti-and diode positively biased of Q7, then and two poles anti-by Q7
Pipe and series resistance constitute circuit and are absorbed by C1, as shown in Figure 10, apply driving open signal before being at this time reversely in electric current
To Q7 and three-phase alternating current circuit Q1~Q6 it is aforementioned in " length " " short " driving signal.When difference is larger in the three-phase alternating current of input
Two-phase voltage difference when being more than the voltage on C1 capacitor, it has been observed that the diode positively biased in circuit is connected, therefore, in circuit
Input switch pipe and rectifier switch unit in switching tube be that no-voltage is open-minded.It is returned to state shown in Fig. 5 again；Extremely
This, a complete loop works for exchanging side are completed.Meanwhile according to analysis above-mentioned, to keep the voltage on C1 sufficiently high,
Therefore it such as will lead in the two-phase operation that difference is taken second place and release energy, so Q7 is given to apply " short " driving signal, that is, protect
Card voltage is not less than the higher two-phase instantaneous value of difference.Signal holding can also be applied to Q7 in practice and reach said function i.e.
Can, it is not necessarily " short " signal above-mentioned.So auxiliary circuit is in entire work, the mainly switching tube in supplementary AC circuit
It is soft to open and inhibit due to voltage spikes, it avoids Q8 from turning off or exchange the peak voltage that side loop opens moment, plays absorption storage
It can effect.
Above each operating mode can carry out equivalent transformation to the circuit of this isolated form three-phase AC/DC conversion device:
It is as shown in figure 12 when the switching tube conducting of certain two-phase, the circuit compared to circuit shown in Fig. 2 data from
Device work in circuit considerably reduces a switching tube, such as Figure 13, transient state after being simplified according to symmetry and switch functionality
In the case of alternating current source by the way that DC source can be equivalent to after diode rectification, alternating current source adds diode can in momentary power in other words
To be considered as DC source；The stacked switch pipe in ac circuit, which also can simplify, simultaneously is equivalent to a switch, therefore such as Figure 14 institute
Show.Auxiliary circuit also can simplify the controlled capacitance circuit for tandem tap pipe simultaneously, therefore can be with equivalent as shown in figure 15.From
After Figure 15 can also clearly learn Q8 shutdown, auxiliary circuit C1 can absorb due to voltage spikes, and can reversed resonance association after Q7 is opened
Help the soft open-minded of input switch.
Carry out it is above-mentioned it is equivalent after, the practical series resonant half bridge circuit that can be regarded as an isolated form of the circuit, to sum up
Described, input switch can be equivalent to bridge arm on one in series resonant circuit, and Q8 is then to represent another lower bridge arm, be based on
Input voltage range and output loading and voltage range, Ying Jinliang are no more than the first switch unit duty ratio of input terminal
75%；If it is desired to which the shutdown of Q8 is Sofe Switch or close to Sofe Switch, to constitute complex resonance, input switch and rectifier switch
Maximum duty cycle most preferably 0.5, formed with second switch unit Q8 it is complementary, and by adjust frequency realize output voltage stabilization,
It is most preferably reduced when input voltage is more than a certain range or underload, then by the maximum duty cycle of the switch of input side
Or deviate 0.5；Afterflow inductance L2 can have；As shown in figure 18, can also there is no L2；If the duty ratio one of first switch unit
Straight to be lower than 0.5, then it is best for having the afterflow inductance.
The converter circuit of this isolated form realizes Sofe Switch work, simultaneously because the control to exchange side Q1~Q6 switching tube
Make the Active PFC function of playing, that is to say, that this converter is just realized by single stage circuit structure and control method
Multiple functions eliminate many power components, while realizing Sofe Switch again, and the loss of switch is smaller, are suitble to high power density
Occasion, the converter circuit of this isolated form can utilize the similar principles of series resonant circuit, change working frequency, so as to
Pressure stabilizing output of the secondary side output circuit under different loads and different input voltages is realized, when input and loading condition deviate one
After fixed frequency shift range, the mode for changing duty ratio is recycled to be adjusted, to guarantee maximum Sofe Switch work
Make.
Compared to existing single-revolution converter, single-stage converter conception is equally realized, is become than traditional three-phase alternating current
Circuit reduction is realized on the basis of parallel operation, while also achieving Sofe Switch, and the utility model is not only defeated in ideal three-phase alternating current
It can be worked normally under the conditions of entering, since exchange side switching tube is able to satisfy under any three-phase alternating current input condition, three intersections of input
When galvanic electricity source wants to be formed into a loop by resonant inductance Lr, transformer, Cr, the switch of quarter-phase circuit is at least needed to open, so
Occur jumping in input voltage or in the case where polarity mutation, it is not easy to form reverse spike voltage and electric current flows backward, to detecing
It surveys protection and requires small, the algorithm of control can be simpler, makes it that can really promote reference on a large scale.And due to auxiliary electricity
Road avoids peak voltage, while realizing the soft open-minded of input side switch again.
To sum up, from structure, the utility model changes the realization side that traditional pfc circuit adds DC isolation translation circuit
Method, by the topological structure of the utility model, energy-storage units after the AC rectification of conventional AC/DC convertor can be saved, together
When can also save DC isolation transformation power device and driving circuit, entire ac-dc conversion circuit is simple, control logic
It simplifies, it is high-efficient, it 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 devices can be saved, while compared to the single-revolution converter being previously mentioned, due to phase three-wire three electricity
The input in source can be formed into a loop between the two phases, and conducting is no longer a phase switching group every time, can be successfully managed input voltage and be gone out
The case where now jump or polarity mutation, grid adaptability is stronger, and job stability is higher, and equipment quality is relatively reliable.
From control, control algolithm can simplify, improve the arithmetic speed of DSP control unit, grasp from the switch of PFC function
From the point of view of making, in locking phase and after judging section, by the driving for applying " length " or " short " driving condition to corresponding alternating-current switch
The specific accounting size of signal, " length " " short " PWM then determines by controlling operation result at that time, as a result, can simplified control mode or
Person's method realizes High Power Factor, low THDI.From the point of view of the angle that Sofe Switch is realized, since hardware each in circuit returns
The presence on road, it is only necessary to which the service time point (or turn-off time point) for paying attention to adjusting each switching tube can to a certain degree
Meet.From the angle of load, because realizing the function of series resonant circuit, using the similar former of series resonant circuit
Reason changes working frequency, so as to realize that pressure stabilizing of the secondary side output circuit under different loads and different input voltages is defeated
Out, after input and loading condition deviate certain frequency shift range, the mode for changing duty ratio is recycled to be adjusted,
To guarantee maximum Sofe Switch work.
For other segments, and so on, the section BC-0, the driving signal of AB two-phase switching tube is " length " PWM
Driving signal, the driving signal of C phase switching tube are " short " PWM drive signal, and the switching tube in C phase circuit is then prior to A phase and B phase
It closes, the section 0-BA, the driving signal of CB two-phase switching tube is " length " PWM drive signal, and the driving signal of A phase is " short " PWM
Driving signal, A phase switching tube are then closed prior to B phase and C phase switching tube；
The driving signal in the section BA-CA, the section BA-0, A, C two-phase is " length " PWM driving condition, and the driving signal of B phase is
" short " PWM drive signal, i.e. B phase circuit are first turned off；The section 0-CA, the driving signal of A, B two-phase are " length " PWM driving condition, C
The driving signal of phase is " short " PWM drive signal, i.e. C phase circuit is first turned off.
The driving signal in the section CA-CB, the section CA-0, B, C two-phase is " length " PWM driving condition, and the driving signal of A phase is
" short " PWM drive signal, i.e. B phase circuit are first turned off；The section 0-CB, the driving signal of A, C two-phase are " length " PWM driving condition, B
The driving signal of phase is " short " PWM drive signal, i.e. B phase circuit is first turned off.
The driving signal in the section CB-AB, the section CB-0, B, A two-phase is " length " PWM driving condition, and the driving signal of C phase is
" short " PWM drive signal, i.e. C phase circuit are first turned off；The section 0-AB, the driving signal of B, C two-phase are " length " PWM driving condition, A
The driving signal of phase is " short " PWM drive signal, i.e. A phase circuit is first turned off.
The driving signal in the section the AB-AC section AB-0, C, A two-phase is " length " PWM driving condition, and the driving signal of B phase is
" short " PWM drive signal, i.e. B phase circuit are first turned off；The section 0-AC, the driving signal of B, A two-phase are " length " PWM driving condition, C
The driving signal of phase is " short " PWM drive signal, i.e. C phase circuit is first turned off.
In whole process, to Q8 apply "It is long" driving signal, the i.e. driving signal complementary with " length " signal, two signals it
Between according to actual circuit need there are certain dead zones." short " signal can be applied to Q7, or apply the duty than " short " signal
Than slightly short pwm signal, it is able to maintain that input switch pipe is soft to be opened and the voltage of C1 is not excessively high.For the letter of control
Change, the driving signal of Q7 is generally denoted as " short " signal in subsequent statement.
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 with the spy of the temporal pattern of each alternating voltage of segment
Sign is to judge, without indicating with desired angle, the characteristics of according to three phase mains signal, is segmented into 12 segments, ten
Two segments are according to above-mentioned principle, the waveform logic table of each switching tube driving signal such as following table one and Figure 16；Due to same
Two switching tubes on phase circuit can apply same signal together, can also apply signal respectively, and since switching tube has instead
And diode, therefore one of them add switching drive signal, if switching tube is without anti-and diode, two switches
Pipe must apply switching signal simultaneously.
Table one, switching tube driving condition mode table
" one " indicates to apply according to aforementioned control method and similarly drive letter with another switching tube in this circuit
Number, or do not need to apply driving signal, specifically referring to rule above-mentioned；It under normal circumstances, is simplified control and hardware electricity
Road, " one " can apply with the same driving signal of another switching tube in this circuit.
“It is long" then indicating the driving signal complementary with " length " signal, according to actual circuit needs, there are one between two signals
Fixed dead zone, as Figure 17 illustrates.
It can be obtained according to each segment of drive waveforms logical table, method control as follows can be performed:
Detect input ac voltage, judge whether each phase index of input voltage meets operating condition, be unsatisfactory for condition after
It is continuous to wait；If meeting condition, then start to work, is judged according to the locking phase of the phase three-wire three power supply voltage signal of input, analysis
Phase and segment locating for the current time of each phase power supply；To in the switch unit under current interval section, on three-phase line
Switching tube all apply driving signal carry out PWM drive control turn it on, according to the natural positively biased of diode be connected principle, three
The higher two-phase of amplitude absolute value (while its amplitude is opposite) between three line power supply of phase forms current lead-through by resonant tank
Circuit；Later, it is needed that the lower phase access of amplitude absolute value in the two-phase is first turned off the (driving that will have been opened according to control
Signal-off), due to the principle of continuity of flow of inductance, two poles in three-phase on the smallest phase line of phase voltage amplitude absolute value at this time
Pipe can mutually be formed current path with amplitude highest by forward bias, continue to primary current resonant tank；
And calculated according to control, then turn off the driving signal of all switching tubes, at this time due to inductance presence dimension in former loop
Hold that current direction is constant, electric current passes through reverse parallel connection (or external) diode continuousing flow of continued flow switch pipe Q8 again, while at this
Electric current is reversed preceding open-minded to continued flow switch pipe application " length " driving signal, i.e., no-voltage is open-minded.Afterflow and reversed is realized simultaneously
The conducting of resonant tank.
Hereafter, close the driving signal of continued flow switch pipe Q8, and after auxiliary circuit starts to charge to input switch pipe and
Auxiliary circuit switch pipe applies " length " " short " driving signal.
According to Concourse Division, corresponding switching tube can be carried out using the above method according to following alternating mode:
Embodiment 2:
As shown in figure 18, the present embodiment proposes a kind of change of isolated form three-phase AC/DC conversion device according to embodiment 1
Shape embodiment does not have energy storage inductor in the output side loop of isolating transformer.Working principle and embodiment 1 are consistent, no longer describe.
Embodiment 3:
As shown in figure 19, the present embodiment proposes a kind of change of isolated form three-phase AC/DC conversion device according to embodiment 1
Shape embodiment proposes another isolated form three-phase AC/DC conversion device, the difference with isolated form AC/DC convertor above-mentioned
It is different to be continued flow switch becoming the bridge switch unit being made of four switching tubes from a switching tube.Since transformer terminal can
To be commutated by bridge switch unit, therefore inputs maximum accounting and can achieve 100%, and the work of bridge switch and often
The full-bridge converter principle of rule is consistent, therefore no longer narration in detail.It is larger that the converter compared to embodiment one is more suitable power
Occasion.
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.
Although having been described and describing the example embodiment for being counted as the utility model, those skilled in the art will be bright
It is white, it can be variously modified and is replaced, without departing from the spirit of the utility model.It is repaired furthermore it is possible to make many
Change so that specific condition to be fitted to the religious doctrine of the utility model, without departing from the utility model central concept described herein.
So the utility model is not only restricted to specific embodiment disclosed herein, but the utility model may further include that belong to this practical
All embodiments and its equivalent of novel range.
Claims (9)
1. a kind of isolated form three-phase AC/DC conversion device, which is characterized in that including primary side input circuit, transformer and secondary side output
Circuit, primary side input circuit include input switch unit, the first rectification unit, auxiliary converting circuit, continued flow switch unit, series connection
Resonant element；Input switch unit includes first switch tube, second switch and third switching tube, the first switch tube,
Two switching tubes and third switching tube are separately positioned in three phase lines of the phase three-wire three power supply of access, also pass through three phases respectively
Line is connect with the first rectification unit；First rectification unit, auxiliary converting circuit, continued flow switch unit and series resonance unit are simultaneously
Connection, the first siding ring of transformer access series resonance unit, and the second siding ring of transformer is connect with secondary side output circuit.
2. isolated form three-phase AC/DC conversion device as described in claim 1, which is characterized in that the first rectification unit includes first
To the 6th diode, the 4th to the 6th switching tube, auxiliary converting circuit includes the 7th switching tube, the 8th diode, the 8th resistance
And first capacitor, continued flow switch unit include the 8th switching tube, series resonance unit includes at least one first inductance, second
Inductance and the second capacitor；
First is separately connected three-phase alternating current input terminal to the source electrode of third switching tube, and first to third switching tube drain electrode connects respectively
Connect three input terminals of the first rectification unit, the cathode of first diode, the second diode cathode, third diode cathode,
One end of the drain electrode of 7th switching tube, the source electrode of the 8th switching tube and the first inductance connects, the anode of the 4th diode, the five or two
Pole pipe anode, the anode of the 6th diode, one end of first capacitor, the drain electrode of the 8th switching tube and the second capacitor one end connect
It connecing, the source electrode of the 4th switching tube connects the cathode of the 4th diode, and the source electrode of the 5th switching tube connects the cathode of the 5th diode,
The source electrode of 6th switching tube connects the cathode of the 6th diode, the anode of the drain electrode connection first diode of the 4th switching tube and the
The drain electrode of one switching tube, the source electrode of the 5th switching tube connect the anode of the second diode and the drain electrode of second switch, and the 6th opens
The drain electrode of the anode and third switching tube of the source electrode connection third diode of pipe, the 8th diode and the 8th resistor coupled in parallel are closed, the
The cathode of eight diodes connects the source electrode of the 7th switching tube, and the anode of the 8th diode connects one end of first capacitor, at least one
One inductance, the second inductance and the second capacitor are serially connected, and the second inductance is the inductance for being directly integrated in inside transformer, i.e. transformation
The first siding ring inductance of device, or the independent external inductance in parallel with transformer first siding ring.
3. isolated form three-phase AC/DC conversion device as claimed in claim 2, which is characterized in that the first capacitor is electrodeless electricity
Perhaps polar capacitor.
4. isolated form three-phase AC/DC conversion device as claimed in claim 2, which is characterized in that the input switch unit and institute
Stating the switching tube in the first rectification unit can be driven by the same driving signal, or be believed each by independent driving
It number is driven.
5. isolated form three-phase AC/DC conversion device as described in claim 1, which is characterized in that the pair side output circuit includes
Second rectification unit, the second siding ring of the transformer are connect with two input terminals of second rectification unit, and described
Two rectification units can be voltage multiplying rectifier, full-wave rectification or full-bridge rectification.
6. isolated form three-phase AC/DC conversion device as claimed in claim 5, which is characterized in that pair side output circuit also wraps
Energy storage afterflow unit is included, the both ends of the energy storage afterflow unit are connect with two output ends of second rectification unit, described
Energy storage afterflow unit includes at least one the third inductance and at least one third capacitor being serially connected.
7. isolated form three-phase AC/DC conversion device as described in claim 1, which is characterized in that switching tube therein is high frequency drive
The semiconductor devices with shutdown is opened in dynamic signal control, and has anti-and diode, the anti-and diode be integrated diode,
Parasitic diode or additional independent diode.
8. isolated form three-phase AC/DC conversion device as described in claim 1, which is characterized in that the primary side input circuit also wraps
Input filter is included, the input filter is arranged in the input switch unit front end, and phase three-wire three power supply is through input filter
The input switch unit is accessed after device filtering.
9. such as the described in any item isolated form three-phase AC/DC conversion devices of claim 1-8, which is characterized in that the continued flow switch
Unit includes the 9th to the 12nd switching tube, and the source electrode connected conduct afterflow of the 9th switching tube and the tenth switching tube is opened
An input terminal of unit is closed, the drain electrode of the 11st switching tube and the 12nd switching tube, which is connected, is used as the continued flow switch list
Another input terminal of member, the drain electrode of the 9th switching tube are connected as the continued flow switch with the source electrode of the 11st switching tube
One output end of unit, the drain electrode of the tenth switching tube are connected as the continued flow switch with the source electrode of the 12nd switching tube
The another output of unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821823037.4U CN209105053U (en) | 2018-11-06 | 2018-11-06 | A kind of isolated form three-phase AC/DC conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821823037.4U CN209105053U (en) | 2018-11-06 | 2018-11-06 | A kind of isolated form three-phase AC/DC conversion device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109120165B (en) * | 2018-11-06 | 2024-03-01 | 南京熊猫电子股份有限公司 | Isolated three-phase AC/DC converter and control method thereof |
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