CN109245594A - A kind of alternating current-direct current two-way changing circuit and its control method - Google Patents
A kind of alternating current-direct current two-way changing circuit and its control method Download PDFInfo
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- CN109245594A CN109245594A CN201811303045.0A CN201811303045A CN109245594A CN 109245594 A CN109245594 A CN 109245594A CN 201811303045 A CN201811303045 A CN 201811303045A CN 109245594 A CN109245594 A CN 109245594A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
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Abstract
The invention discloses a kind of alternating current-direct current two-way changing circuit and its control method, which includes three phase inversion bridges, first switch group and second switch group；Input terminal of the input terminal of three phase inversion bridges as circuit, three phase lines are separately connected the input terminal of three phase inversion bridges, and the output end of three phase inversion bridges is connect with the input terminal of first switch group and second switch group respectively；The circuit symmetrical that the output end of the centre cap of first switch group and the output end of second switch group as circuit, first switch group and second switch group are constituted.Circuit of the invention has the characteristics of traditional three level and two level, and switching loss substantially reduces, and efficiency can be improved or improve working frequency in the case where maintaining like loss.
Description
Technical field
The present invention relates to ac-dc conversion fields, more particularly to a kind of alternating current-direct current two-way changing circuit and its controlling party
Method.
Background technique
Two traditional level translation technologies (three phase full bridge) employed in existing three-phase AC/DC conversion circuit exist
Biggish switching loss, further, since the voltage stress that switching tube is born is relatively high, the case where taking into account efficiency and price
Under, it is unfavorable for the selection of component, influences properties of product.If three level-conversion circuits known to selecting, such as three level of T-type
Or three level of I type, then the component in circuit is more, thus sexual valence is poor.
Summary of the invention
Present invention aims at a kind of alternating current-direct current two-way changing circuit and its control method is proposed, to solve above-mentioned existing skill
Switching loss and cost performance existing for art are difficult to the technical issues of taking into account.
For this purpose, the present invention proposes a kind of alternating current-direct current two-way changing circuit, including three phase inversion bridges, first switch group and second
Switching group；Input terminal of the input terminal of the three phase inversions bridge as the circuit, three phase lines are separately connected three phase transformation
The input terminal of bridge is changed, the output end of the three phase inversions bridge connects with the input terminal of the first switch group and second switch group respectively
It connects；The output end of the centre cap of the first switch group and the output end of the second switch group as the circuit, it is described
The circuit that first switch group and second switch group are constituted is symmetrical above and below；When being converted into direct current for exchanging, three phase inversion
Bridge is three-phase rectification bridge, and the first switch group is boosted switch group, and the second switch group is boosting continued flow switch group；When with
When direct current is converted into exchange, the three phase inversions bridge is three phase inverter bridge, and the first switch group is decompression continued flow switch group,
The second switch group is step-down switching group.
The present invention also provides a kind of control methods of foregoing circuit, comprising:
According to the section of three-phase ac signal described in the phase of the three-phase ac signal of exchange side, voltage magnitude Relation acquisition
Section, to each phase voltage under current interval section compared with the voltage of setting, the two-phase voltage for meeting natural commutation turn-on condition is each
From correspond to three phase inversion bridges on switching tube be connected, and in the circuit for realizing exchange conversion at the function of direct current
When, pwm control signal is applied to the 7th to the 8th switching tube, in the circuit for realizing DC converting at the function of exchange
When, pwm control signal is applied to the 9th to the tenth switching group, so that the two-phase voltage constitutes circuit；Natural commutation is unsatisfactory for lead
One phase voltage of gating condition, by two switching tubes on the bridge arm to the three phase inversions bridge corresponding with the phase voltage
One application pwm control signal, the phase alternating current source for keeping it opposite with amplitude in the two-phase voltage constitute current loop.
Beneficial effects of the present invention are as follows:
Circuit hardware framework of the present invention provides traditional three level and two level circuits, and respectively the independent electric current not having is logical
Road, wherein since the end DC has been kept apart in the presence of second switch group, have short access when three phase full bridge inductive energy storage
(low conduction loss) advantage avoids the high conduction loss disadvantage of " I " three level；Simultaneously because the presence of first switch group is again
Avoid the high switching voltage stress (high switching loss) of three phase full bridge.
Furthermore the advantage for the low switching losses that the control method cooperation circuit of the present invention can further realize three level exists
The higher each segment of voltage magnitude works in three level modes, works in two electricity in the lower each segment of voltage magnitude
It is flat-die type powdered, while release can afterflow for inductive energy storage stage when doing rectification function work or inductance when doing inversion function operation
The advantages of phase transformation bridge can also work in composite mode, therefore it has had both three level and two level, switching loss is significantly
It reduces, efficiency improves.
Therefore the relatively general device of performance can be selected in three phase inversion bridges, and first switch group and second switch group are selected
The device of better performances, while more devices are saved compared to traditional three level schemes, to realize being decreased obviously for cost.
When as exchange conversion direct current, also has the function of PFC；When exchanging as DC converting, also has the function of inversion.
Detailed description of the invention
Fig. 1 is the translation circuit structural schematic diagram of the specific embodiment of the invention；
Fig. 2 is the schematic diagram of the translation circuit structure combination peripheral circuit of the specific embodiment of the invention；
Fig. 3 is the waveform in the three-phase alternating current source of the input of the specific embodiment of the invention with reference to figure；
Fig. 4 is that the exchange of the specific embodiment of the invention turns circuit energy storage working condition signal one when direct current；
Fig. 5 is that the exchange of the specific embodiment of the invention turns circuit energy storage working condition signal two when direct current；
Fig. 6 is that the exchange of the specific embodiment of the invention turns circuit boosting working condition signal one when direct current；
Fig. 7 is that the exchange of the specific embodiment of the invention turns circuit boosting working condition signal two when direct current；
Fig. 8 is that the exchange of the specific embodiment of the invention turns circuit energy storage working condition signal three when direct current；
Fig. 9 is the three-phase alternating current waveform of the output of the specific embodiment of the invention with reference to figure；
Figure 10 is inversion decompression work signal one when the direct current of the specific embodiment of the invention delivers stream；
Figure 11 is inversion decompression work signal two when the direct current of the specific embodiment of the invention delivers stream；
Figure 12 is inversion afterflow work signal one when the direct current of the specific embodiment of the invention delivers stream；
Figure 13 is inversion afterflow work signal two when the direct current of the specific embodiment of the invention delivers stream；
Figure 14 is inversion afterflow work signal three when the direct current of the specific embodiment of the invention delivers stream；
Figure 15 is the working state schematic representation of three level of I type that can be two-way；
Figure 16 is the working state schematic representation of three level of T-type that can be two-way；
Figure 17 is the working state schematic representation of two level of three phase full bridge that can be two-way.
Specific embodiment
With reference to embodiment and compares attached drawing invention is further described in detail.It is emphasized that
Following the description is only exemplary, the range and its application being not intended to be limiting of the invention.
Referring to the following drawings, non-limiting and nonexcludability embodiment will be described, wherein identical appended drawing reference indicates
Identical component, unless stated otherwise.
A kind of alternating current-direct current two-way changing circuit provided in an embodiment of the present invention includes three phase inversion bridges, first switch group and the
Two switching groups；Input terminal of the input terminal of three phase inversion bridges as circuit, three phase lines are separately connected the input of three phase inversion bridges
End, the output end of three phase inversion bridges are connect with the input terminal of first switch group and second switch group respectively；In first switch group
The circuit pair that output end of the output end of heart tap and second switch group as circuit, first switch group and second switch group are constituted
Claim；When for exchange be converted into direct current when, three phase inversion bridges be three-phase rectification bridge, first switch group be boosted switch group, second
Switching group is boosting continued flow switch group；When being converted into exchange for direct current, three phase inversion bridges are three phase inverter bridge, first switch
Group is decompression continued flow switch group, and second switch group is step-down switching group.
As shown in Figure 1, three phase inversion bridges include first to the 6th switching tube Q1~Q6, first switch group includes the 7th to the
Eight switching tube Q7~Q8, second switch group include the 9th to the tenth switching tube Q9~Q10, the switch of first switch tube Q1 and the 4th
Pipe Q4 is arranged on same bridge arm, and second switch Q2 and the 5th switching tube Q5 are arranged on same bridge arm, third switching tube Q3
It is also disposed on same bridge arm with the 6th switching tube Q6；First to third switching tube Q1~Q3 source electrode, the 7th switching tube Q7
The drain electrode of source electrode and the 9th switching tube Q9 connects, the drain electrode of the 4th to the 6th switching tube Q4~Q6, the drain electrode of the 8th switching tube Q8
Connected with the source electrode of the tenth switching tube Q10, the drain electrode of the 7th switching tube Q7 connected with the source electrode of the 8th switching tube Q8 after as the
The centre cap of one switching group, output of the drain electrode of the source electrode and the tenth switching tube of the 9th switching tube Q9 as second switch group
End.
Power switch Q1~Q10 is connect by driver with the grid (or gate pole) of each switching tube, and driver is controlled by
Controller, after controller obtains necessary information and data by communication, the sampling of periphery, according to control algolithm output driving wave
Shape realizes that the conducting of each switching tube and cut-off control, so that the DC voltage or alternating voltage of output required for reaching is steady
Fixed control, stabilizes the output voltage required for exporting in other words.
As shown in Fig. 2, the circuit structure periphery in Fig. 1 is added to peripheral circuit；Including alternating current source, inductance and capacitor, hand over
The triple line in stream source passes through inductance respectively and connect with the every phase input terminal of three phase inversion bridges, the centre cap of first switch group and second
Capacitor is also connected between the output end of switching group.
Inductance includes first to third inductance L1~L3, and capacitor includes the first to the second capacitor C11~C12, three inductance
L1~L3 is connect with the input terminal of three phase inversion bridges respectively；The source electrode of 9th switch Q9 is connected with the anode of first capacitor C11；
The drain electrode of tenth switch Q10 is connected with the cathode of the second capacitor C12, and the drain electrode of the 7th switching tube Q7 is with the 8th switching tube Q8's
Source electrode is connected with the anode of the cathode of first capacitor C11 and the second capacitor C12；
Circuit further includes the first to the second DC source DC11, DC12, one end of the first DC source DC11 and first capacitor C11
Anode connection, the one of the cathode of the other end and first capacitor C11, the anode of the second capacitor C12 and the second DC source DC12
End connection, the other end of the second DC source DC12 are connect with the cathode of the second capacitor C12.
The left side of attached drawing 1 is exchange side, and the right is DC side, and exchange side can be used as the output or defeated of three-phase ac signal
Enter, three-phase alternating current source is divided into A phase, B phase and C phase, and ideal voltage waveform is as shown in attached drawing 3 between each phase, phase phase difference
120°.DC side is equipped with the first to the second capacitor C11, C12, and exchange side is equipped with first to third inductance L1~L3；The present embodiment
In, as shown in Fig. 2, it is additionally provided with filter between the triple line and inductance of exchange side alternating current source, which can be EMI
Filter, for filtering out electromagnetic interference；As shown, first to third inductance L1~L3 is separately positioned on A phase, B phase and C phase
On, in some variant embodiments of the present embodiment, filter can also be not provided with；In the present embodiment, one end of filter connects
Then first to third inductance L1~L3, and the other end can be used as the output of three-phase ac signal to provide electric energy for AC load,
The function of translation circuit is that direct current delivers stream (inversion) at this time；Also it can connect three-phase alternating current source and provide electric energy for translation circuit,
The function of translation circuit is that exchange turns direct current at this time；In the present embodiment, as shown in Fig. 2, the DC side on the right of attached drawing 2 includes the
One DC source DC11, the second DC source DC12, the first DC source DC11, the second DC source DC12 are one another in series, two DC sources
It can be the equivalent of DC load or circuit, be respectively the as equivalent load by first capacitor C11, the second capacitor C12
One DC source DC11, the second DC source DC12 provide energy storage filtering, and the function that translation circuit is realized at this time is that exchange turns direct current,
It rectifies, PFC function may be implemented；Certainly, the first DC source DC11, the second DC source DC12 are also possible to mention for translation circuit
For the power supply of DC inversion exchange, the function of translation circuit is that direct current delivers stream (inversion) at this time；In the present embodiment, direct current is delivered
Stream, the DC source (the first to the second DC source DC11, DC12) as power supply of DC side, it should be appreciated that the DC source
It should not be simply understood as battery or DC power supply, should also include that other can provide the circuit of direct current energy, such as DC to DC
Inverter circuit or DC inversion be exchange translation circuit.Conversely, what is connect with DC side is equivalent when AC to DC
DC load also should not simply be understood as battery or DC power supply, can also be and absorb the inverse of direct current energy DC to DC
Power transformation road or inversion are the translation circuit of exchange.
The embodiment of the present invention also provides a kind of control method of foregoing circuit, comprising:
According to the section of three-phase ac signal described in the phase of the three-phase ac signal of exchange side, voltage magnitude Relation acquisition
Section, to each phase voltage under current interval section compared with the voltage of setting, the two-phase voltage for meeting natural commutation turn-on condition is each
From correspond to three phase inversion bridges on switching tube be connected, and in the circuit for realizing exchange conversion at the function of direct current
When, pwm control signal is applied to the 7th to the 8th switching tube, in the circuit for realizing DC converting at the function of exchange
When, pwm control signal is applied to the 9th to the tenth switching group, so that the two-phase voltage constitutes circuit；Natural commutation is unsatisfactory for lead
One phase voltage of gating condition, by two switching tubes on the bridge arm to the three phase inversions bridge corresponding with the phase voltage
One application pwm control signal, the phase alternating current source for keeping it opposite with amplitude in the two-phase voltage constitute current loop.
Preferably, the translation circuit of the control method is for realizing exchange conversion at the function of direct current；Including three-phase
Alternating current source (or equivalent AC source), for providing three-phase alternating-current powered in exchange side；Described first to third inductance respectively with
The three-phase alternating current source is connected, and the first to the second capacitor is to filter energy storage and to DC load (or Equivalent DC load)
Power supply；The total voltage be higher than in the three-phase ac signal absolute amplitude of first voltage and second voltage and；Described 7th
Apply pwm control signal to the 8th switching tube, the 9th to the tenth switching tube is used for afterflow.In the three-phase alternating voltage not
The phase voltage connection transformation bridge (minimum by amplitude absolute value) for meeting nature turn-on condition makees PWM work, three intersection
The two-phase for meeting rectification nature turn-on condition in galvanic electricity pressure connects transformation bridge and makees long-term ON operation.
Preferably, the translation circuit of the control method is for realizing DC inversion at the function of exchange；Including first
To the second DC source (or Equivalent DC source), for providing direct current supply in DC side；The first to the second direct current subject string
Connection connection, the first to the second capacitor are connected in parallel on the both ends of the first to the second DC source respectively；Described first to third inductance and hand over
Current load (or equivalent AC load) is connected；The total voltage is higher than first voltage and the second electricity in the three-phase ac signal
The absolute amplitude summation of pressure；9th to the tenth switching tube applies pwm control signal, and the 7th to the 8th switching tube is used for
Afterflow.The three-phase alternating voltage is that the transformation bridge of the minimum phase of amplitude absolute value makees PWM work, phase in the three-phase alternating voltage
Correspondence switching tube in two phase inversions bridge higher to amplitude then makees long-term ON operation within the period.
Preferably, when which does exchange and turn DC control, when (PWM controls mould to the 7th to the 8th switching tube
Formula) conducting when, exchange side two-phase voltage is converted bridge and switching tube forms short circuit, i.e., carry out energy storage to inductance, entered by inductance
Three level energy storage modes；When the pwm control signal of the 7th to the 8th switching tube is kept it turned off, pass through exchange side two-phase electricity
The anti-and diode of corresponding inductance and the 9th to the tenth switching tube carries out releasing energy afterflow in pressure, into tri-lever boosting mould
Formula；When the phase voltage for being unsatisfactory for natural commutation turn-on condition is corresponding applies the switching tube conducting of pwm control signal,
Energy storage is carried out by the corresponding inductance in exchange side, into two level energy storage modes；When the switching tube for applying pwm control signal
When cut-off, inductance is connected by the natural positively biased of anti-and diode of another switching tube on the bridge arm for convert bridge that is connected with this
It carries out releasing energy afterflow, keeps two lever boosting modes.The control method preferably will in three level inductive energy storage modes simultaneously
The switching tube application not turned in transformation the first to the 6th switching tube of bridge " is slightly later than after the 7th to the 8th switching tube is opened and opens again
It is logical, and be first turned off before the shutdown of the 7th to the 8th switching tube " driving signal, to obtain the current loop of smaller impedance,
Lower switching loss realizes the effect of two level of three phase full bridge and three level, i.e. composite mode.
Preferably, when which does direct current and deliver flow control, when the 9th to the tenth switching tube conducting, pass through
Corresponding inductance carries out energy storage and divides in exchange side two-phase voltage, into three-level buck mode；When the described 9th to
When tenth switching tube ends, pass through corresponding inductance and the 7th to the 8th switching tube anti-in exchange side two-phase voltage and two
Pole pipe carries out releasing energy afterflow, into three level freewheeling modes；When the corresponding switching tube of the lower phase voltage of the amplitude applies
When the conducting of pwm control signal, energy storage is carried out by the corresponding inductance in exchange side and is divided, into two level buck modes；When
When the switching tube pwm control signal ends, pass through the exchange corresponding inductance in side and the transformation bridge corresponding with the phase voltage
Bridge arm on another switching tube anti-and diode positively biased be connected naturally and release can afterflow, into two level afterflow moulds
Formula.The control method will preferably be converted in bridge the first to the 6th switching tube and not turned in three level freewheeling modes simultaneously
Switching tube apply " it is be slightly later than open-minded again after the shutdown of the 9th to the tenth switching tube, and before the 9th to the tenth switching tube is opened
Be first turned off " driving signal (if the cutout of certain phase loop current or it is reversed need not continue to conducting if shutdown to inductive switch
The driving signal of pipe), to obtain the current loop of smaller impedance, lower switching loss, realize two level of three phase full bridge and
The effect of three level, i.e. composite mode.
Preferably, which either makees exchange and turns direct current either when delivering stream as direct current, afterflow or from
The switching tube so rectified, by applying driving signal conducting to achieve the purpose that synchronous rectification.
The present embodiment combination attached drawing 2-8 will be described in the detailed embodiment that this translation circuit turns direct current as exchange；
To realize that alternating voltage turns the rectification conversion function of DC voltage, which is arranged three-phase alternating current in exchange side
Source, three-phase alternating current source are phase three-wire three alternating current source (can certainly be three-phase four-wire system), as described above, including A phase, B phase and C
Phase, for three-phase alternating current waveform as shown in figure 3, should know, the present embodiment is with the three-phase alternating current of three-phase alternating current source standard
Waveform is as an example, purpose is to state the present embodiment, in actual use, the width of the waveform in three-phase alternating current source for convenience
Value, phase will likely have mutation, however, can also be on the basic principle of the present embodiment to off-gauge three intersection
Same transform method and principle, the present invention are implemented in stream source will be not excluded for such situation.
In Fig. 2, input A represents input A phase, and input B represents input B phase, and input C represents input C phase；It retouches for convenience
It states, if three-phase voltage differs 120 °, and is sinusoidal voltage, every 360 ° circulations；In view of stating intuitive and convenient, arrived with 30 °
390 ° (30 ° of points in next period) be a complete cycle, therefore as shown in figure 3, each joint be 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.?
In three-phase alternating current waveform, remember that the positive maximum peak voltage of every phase exchange is first voltage V1, remembers that the negative sense of every phase exchange is maximum
Crest voltage is first voltage V2, and usually it is equal with V2 to default V1 for we, therefore we are denoted as V, or choose in V1 and V2
One the larger value is denoted as V；In DC side, according to the highest amplitude V of the three-phase ac signal in three-phase alternating current source, by equivalent direct current
The total voltage V11-V12 of load DC11+DC12 is set higher thanThe voltage is nominally VBus；According to natural commutation principle,
The higher switching tube that can make to convert on bridge of amplitude absolute value is anti-and diode bears positively biased voltage turn-on, therefore, according to boosting
Principle when the 7th switching tube Q7 and the 8th switching tube Q8 are connected together, then meets the correspondence two-phase voltage meeting of aforesaid voltage condition
Conducting, after conducting, the voltage of this two-phase can then be born in input inductance L (L1~L3), inductive energy storage at this time, meanwhile, this when
Carving the low pressure in intermediate magnitude is to be unsatisfactory for a phase voltage of turn-on condition, then can open corresponding on transformation bridge bridge arm open
It closes a pipe other phase voltage contrary with amplitude to be connected, so that input inductance L corresponding with this is also carried out
Q7 is worked as in energy storage, and after Q8 is closed, then the inductance L electromotive force in the two-phase is reversed, is connected in series through the 9th with input voltage at this time and opens
The anti-and diode for closing pipe Q9 and the tenth switching tube Q10 carries out energy release；If open-minded when above-mentioned diode current flow
Its corresponding switching tube, then form synchronous rectification.
For ease of description, the present embodiment takes the section AC-BC to carry out schematic operational state；If arriving BC point since AC point, being
The section AC-BC, section A phase are higher than C phase with B phase voltage amplitude absolute value, therefore in AC-BC segment, the width of A phase B phase
Value meets natural commutation turn-on condition, and C phase is unsatisfactory for natural commutation turn-on condition, similar, remaining 5 area in a cycle
Between section (segment BC-BA；BA-CA；CA-CB； CB-AB；AB-AC) can also and so on.
Segment AC-BC can divide according to zero crossing 0 for AC0 sections and 0BC sections；AC0 sections are first stated, as shown in figure 4,
The section, the amplitude of A phase B phase meet diode natural commutation turn-on condition on transformation bridge, and C phase then can only switch change-over bridge
It boosts after carrying out inductive energy storage after corresponding switching tube, therefore in AC0 and 0BC segment, it can be to first switch tube Q1 and the
Five switching tube Q5 impose high level, are always maintained at conducting, synchronous rectification are formed, to reduce the loss of diode natural commutation；When
After 7th switching tube Q7 and the 8th switching tube Q8 apply pwm control signal conducting, electric current passes through the first inductance L1 from A phase, and first
Switching tube Q1, the 7th switching tube Q7, then to the inductance L2 of the 8th switching tube Q8, the 5th switching tube Q5, second, B phase is returned to, in this phase
Between, alternating current source and the first inductance L1 and inductance L2 composition short-circuit condition, i.e. energy storage, therefore, the state and three traditional level
Double boost circuits or the work of I type tri-level circuit are consistent.Simultaneously to the converted on bridge connect with C phase third inductance L3
Six switching tube Q6 apply PWM and are connected, therefore it directly connect with the 5th switching tube Q5 in B phase circuit, therefore L3 is also at
Energy storage state.At this point, the working condition of Q5 is similar to two level of three phase full bridge；In above performance loop, it is open-minded to be PWM
Opening of being born of switching tube two traditional level-conversion circuits of transient voltage stress ratio are low, and the turn-on consumption of switching tube is more
It is small.Therefore the stage, we claimed A, and B phase is three level modes, and C phase is two level modes.
As shown in figure 5, in the state, the electric current of A, B phase may meet control needs according to the needs of control, because
This closes the pwm control signal of the 7th switching tube Q7 and the 8th switching tube Q8, then electricity is exited in the tank circuit disconnection of the two-phase
Feel energy storage mode, the electromotive force of inductance reversely releases energy, and the anti-and diode of the 9th switching tube Q9 is led by positive bias-voltage at this time
It is logical, switch to boost mode, i.e. A, the current loop of B phase remains unchanged, and electric current passes through the first inductance L1, first switch tube from A phase
Q1 gives first capacitor C11 charging to the 9th switching tube Q9, while also powering to equivalent load or power supply DC11, using the
Two capacitor C12 and equivalent load or power supply DC12 flow back to the tenth switching tube Q10, pass through the 5th switching tube Q5 and the second inductance
L2 returns to B phase source.And the third inductance L3 of C phase needs to continue energy storage, therefore the 6th switching tube Q6 is still according to control needs
It keeps open-minded, maintains to connect conducting with the 5th switching tube Q5, constitute circuit with B phase.At this point, the state of A phase B phase then with tradition
The double boost circuit of three level or the work of I type tri-level circuit it is consistent, and the state of C phase still with two traditional level differences
Seldom, thus the stage we claim A, B, be mutually three level modes, C phase is two level modes at this time.
As shown in fig. 6, in the state, A, the electric current of B phase still maintain original release can pressure-increasning state, electric current do not stop or
Reversely, therefore current loop does not have any variation；And C phase closes the 6th switching tube Q6 according to control needs, inductive switching is to release
The anti-and diode of energy pressure-increasning state, third switching tube Q3 can boost and positively biased conducting because the inverse electromotive force of inductance is formed.
Therefore it connect with the first switch tube Q1 in A phase circuit, powers together to the circuit at rear portion.At this point, the state of A phase B phase then with
The double boost circuits of three traditional level or the work of I type tri-level circuit are consistent, and the state of C phase and two traditional level differences
Seldom, thus this stage we still claim A, B, be mutually three level modes, C phase is two level modes.
If C phase inductance energy storage is less according to control condition, therefore it can first stop, when electric current approached discontinuously or
Person is reversed, and the electric current of A phase B phase needs continue to, if then have out the synchronous rectification signal of third switching tube Q3 at this time can
Will drive closing, current loop is because the anti-and diode of third switching tube is interrupted by reverse-biased meeting nature, the electricity on L3 inductance
Stream also returns zero.For associated loop as shown in fig. 7, AB two-phase then can be considered three level modes, C phase then waits next cycle at this time
Fig. 4 mode.
In conclusion that in PWM working condition is only Q6, Q7 and Q8 during segment ACO works.And
The switching voltage stress that Q7, Q8 are born is lower, and the turning-on voltage stress of Q6 is relatively low.Others conducting be diode or
Person is the synchronous rectification of switching tube.Therefore switching loss is substantially reduced compared to traditional three level of three phase full bridge or T-shape.
In OBC sections of sections, because between C phase has been changed to minus zone, but still it is to belong to that amplitude is lower, is unsatisfactory for transformation bridge
Natural commutation turn-on condition, so in the section, except the rectifier bridge of C phase connected needs the switching tube opened to become Q3
Outside, the associated loop of A, B two-phase and working principle and aforementioned almost without transformation, therefore interlock circuit working principle is not tired
It states.Its schematic diagram no longer faithful representation.Being in PWM working condition during the segment is Q3, Q7 and Q8.
As shown in the following table 1 and 2, with the passage of phase, when each phase voltage enters other segments together, class like this
Push away, each segment work in PWM mode only have the 7th switching tube Q7 and the 8th switching tube Q8 and with three-phase alternating current source amplitude
Switching tube is corresponded in the lower transformation bridge being connected of absolute value.When turning direct current as exchange, one can be provided for DC load
The power supply of more current potentials (level) includes intermediate current potential (level), the current potential (level) of first capacitor C11 anode in DC side
Cathode potential (level) V12 of V11, the second capacitor C12 amount to 3 current potentials (level).Therefore above-mentioned to work in PWM state
Switch tube efficiency the advantages of obtaining three level, it is while again more succinct than three conventional level, and the height for avoiding two level is opened
Powered-down compression drawback, in the case where taking into account efficiency, and has taken into account price, facilitates design.
Meanwhile exchange is when turning direct current, as described above, meeting turn-on condition when carrying out PWM control conducting to Q7 and Q8
Two-phase forming circuit can then make to be unsatisfactory for natural commutation turn-on condition by the control to the correspondence switching tube on transformation bridge
A phase, circuit can also be constituted by corresponding switching tube and other two-phase on transformation bridge, thus it is guaranteed that voltage and electric current
Waveform mutually follow, to realize Active PFC.
In some alternative embodiments in the present embodiment, in above process, if working as switching tube to reduce loss
Anti- and diode operation and rectification on state when, driving can also be applied to it and reach synchronous rectification effect.It can obtain
Low conducting voltage is taken, is improved efficiency.
Table 1, rectifier switch pipe driving condition one
Above table indicates the PWM mode of main switching tube during the work time, and "-" expression can use its anti-and two pole
Pipe is connected naturally when meeting condition, can also apply driving signal when diode current flow and reach synchronous rectification
Effect；Space indicates not open-minded.
Table 2, rectification mode one
In addition in above-mentioned state and switching mode, in addition to synchronous rectification signal can be implemented, to further decrease switch
The conduction loss of pipe, for transformation bridge arm in switching tube, i.e., in table one the switching tube first switch tube in space to the 6th switch
Q1~Q6 can also apply pwm signal to the switching tube not turned in the bridge arm, make inductive energy storage in inductance L energy storage stage
Current loop is shorter, or forms the shunting with primary current circuit according to impedance loop size.I.e. former schematic diagram 4 is above-mentioned in application
Associated loop signal such as Fig. 8 after driving signal；In view of opening and the switching loss of shutdown moment, the drive being applied on the bridge arm
Dynamic signal should abide by as far as possible " it is open-minded again after the driving of Q7 and Q8 is opened, Q7 and Q8 driving shutdown before before
Shutdown " principle be it is optimal, with " S-W " illustrate the correspondence instantaneously in short-term PWM drive；So switch state table above-mentioned and rectification
Mode can be expressed as table 3 and table 4 again.
Table 3, switching tube state two
Above table indicates the PWM mode of main switching tube during the work time, and "-" expression can use its anti-and two pole
Pipe is connected naturally when meeting condition, can also apply driving signal when diode current flow and reach synchronous rectification
Effect.
Table 4, rectification mode two
" composite mode " in table refer to original similar three level mode in this state, the switching tube for converting bridge is being applied
After adding " S-W " signal, there are the similar effects of two level of three phase full bridge again, so we term it " composite modes ".
Above-mentioned state and integrated mode are only conventional in the ideal situation, this circuit is when realizing rectification function, at this
In the process, may exist it is dynamic or other the case where, it is therefore possible to which needs can be controlled according to practical, be formed other
Current loop combination and control method.Or above-mentioned optimal drive mode principle is not used, and use the mode being previously mentioned
Transformation combination is carried out, is also also possible to achieve the effect that optimize compared to traditional circuit performance.Relevant control mode present case can not
It is exhaustive herein, do not represent limitation of the present invention.
In some alternative embodiments of the present embodiment, when this translation circuit only turns DC converting as exchange, because
9th switching tube Q9 and the tenth switching tube Q10 only play afterflow, it is possible to which the 9th, the tenth switching tube is substituted for respectively
Nine diode D9 and the tenth diode D10；9th diode anode with first, second, third and the 7th switching tube source electrode
It is connected, the cathode of the 9th diode D9 is connected with the anode of first capacitor C11；The cathode of tenth diode and the 4th, the 5th,
The drain electrode of six and the 8th switching tube is connected, and the anode of the tenth diode D10 is connected with the cathode of the second capacitor C12.
The present embodiment combination attached drawing 9-14 will be described in detailed embodiment party of this translation circuit as direct current conversion exchange
Formula；
To realize that direct current delivers the function of stream, which is arranged the first to the second DC source in DC side (or can
It is equivalent to the circuit of DC source) DC11, DC12, the first to the second DC source DC11, DC12 series connection, the first to the second
Capacitor C11, C12 are connected in parallel on the both ends of the first to the second DC source DC11, DC12 respectively；Described first to third inductance L1~
L3 is connected with AC load.
The AC load includes that A phase, B phase are exported with C phase, and three-phase alternating current waveform is as shown in Figure 9.It should know,
The present embodiment is the three-phase alternating current waveform with standard as an example, purpose is actually to make in order to facilitate statement the present embodiment
Used time, amplitude, the phase of the three-phase alternating current waveform of output will likely have mutation, however, can also be in the present embodiment
Basic principle on same inverse method and principle, the present invention are implemented to the output of off-gauge three-phase alternating current will be not excluded for this
Class situation.
In Fig. 9, output A represents output A phase, and output B represents output B phase, and output C represents output C phase；It retouches for convenience
It states, if the three-phase voltage of output differs 120 °, and is sinusoidal voltage, every 360 ° circulations；In view of stating intuitive and convenient, with
30 ° to 390 ° (30 ° of points in next period) are a complete cycle, therefore as shown in fig. 7, 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.In three-phase alternating current waveform, remembers that the positive maximum peak voltage of every phase exchange is first voltage V1, remember the negative of every phase exchange
Be first voltage V2 to maximum peak voltage, usually it is equal with V2 to default V1 for we, therefore we are denoted as V, or selection V1 and
The larger value in V2 is denoted as V；It, will be equivalent straight according to the amplitude V of the three-phase ac signal in three-phase alternating current source in DC side
The total voltage V11-V12 of stream source DC11+DC12 is set higher than √ 3*V, which is nominally VBus；It is depressured according to inversion former
Reason applies PWM driving signal, the 9th switching tube Q9 and the tenth switching tube Q10 is connected, while each phase inductance L1~L3 is therewith
The switching tube at the correspondence bridge arm end of each phase of connection is also open-minded, then will form current loop, is higher than preset output AC voltage
Voltage partial pressure can be then constituted on outputting inductance L (L1~L3), inductive energy storage at this time, when the 9th switching tube Q9 and the tenth is switched
After the driving signal of pipe Q10 is closed, the correspondence bridge arm end switch pipe for connecting each phase still keeps open-minded, then the inductance in the two-phase
Electromotive force is reversed, constitutes continuous current circuit by the anti-and Diode series of the 7th switching tube Q7 and the 8th switching tube Q8 at this time and carries out
Energy release；The mode is then similar to " I " type tri-level circuit；If the instantaneous moment is in the low-voltage alternating-current phase of intermediate magnitude
Inductance need then close former corresponding amplitude direction switch pipe into freewheeling state in advance, while opening transformation bridge bridge arm
On reversed amplitude direction switch pipe carry out inductance energy and discharge afterflow, which is then similar to two level circuit of three phase full bridge.
For ease of description, the present embodiment takes the section AC-BC to carry out schematic operational state；If arriving BC point since AC point, being
The section AC-BC, section A phase are higher than C phase with B phase voltage amplitude absolute value, therefore in AC-BC segment, the width of A phase B phase
Value value is high, needs turn-on time long, C phase amplitude is low, is introduced into freewheeling mode.I.e. AB phase works in three level modes, and C phase works
In two level modes；Similar, remaining 5 segment (segment BC-BA in a cycle；BA-CA；CA-CB；CB-AB；
AB-AC) can also and so on.
Segment AC-BC can be ACO sections and OBC sections according to zero crossing O points；ACO sections are first stated, as shown in figure 9,
The amplitude of the section, A phase B phase is relatively high, and C phase is lower, therefore according to decompression principle, A phase B phase is connected from DC side inversion
Time relatively can be longer than C phase, therefore C phase then needs to carry out the correspondence switching tube on switch change-over bridge in each switch periods
Inductive energy storage is discharged after shutdown again and carries out afterflow, therefore in ACO and OBC segment, it can be to first switch tube Q1 and the 5th
Switching tube Q5 imposes high level, is always maintained at conducting；When the 9th switching tube Q9 and the tenth switching tube Q10 applies pwm control signal
After conducting, electric current from DC side pass through the 9th switching tube Q9, first switch tube Q1, the first inductance L1, reach output terminals A phase (or
The filter end of person's A phase), electric current passes through B phase (or filter end of B phase) and the second inductance L2, the 5th switching tube Q5 is returned to,
Using the tenth switching tube Q10, the negative terminal of DC side is returned to, during this period, according to decompression principle, the first inductance L1 and inductance
L2, which is constituted, to be divided, i.e. energy storage, therefore, the state and the double boost equivalent circuits of three traditional level or the equivalent electricity of three level of I type
Road work is consistent.Apply PWM to the third switching tube Q3 on the transformation bridge connecting with C phase third inductance L3 simultaneously to be connected,
Therefore it directly connect with the DC side of the 9th switching tube Q9 connection, and electric current flows into L3 arrival C phase (or C phase filter through Q3
End) therefore L3 be also at partial pressure energy storage state.Correlated current circuit is as shown in Figure 10；At this point, the working condition of Q5 is similar to three
Two level of phase full-bridge；In above performance loop, that does that the switching tube that PWM is opened born opens transient voltage stress ratio
Two traditional level-conversion circuits are low, and the turn-on consumption of switching tube is smaller.Therefore the stage, we claimed A, and B phase is three level moulds
Formula, C phase are two level modes.
As shown in figure 11, in the state, A, B phase still maintains former decompression state, and current direction does not have reversed, therefore electric current
Circuit and related switch tubulose state do not have any variation；And C phase closes third switching tube Q3 according to control needs, inductance L3 turns
It is changed to de-energized state, i.e. electromotive force is reversed afterflow；The anti-and diode of 6th switching tube Q6 can be because of the reversed electricity of inductance
Kinetic potential forms boosting and positively biased is connected.Therefore it connect with the 5th switching tube Q5 in B phase circuit, and electric current is by negative terminal afterflow to outside
Load or equivalent load power supply.At this point, the state of A phase B phase then with the double boost circuit of equivalent three traditional level or
The work of person's I type tri-level circuit is consistent, and the state of C phase and traditional two level of three phase full bridge are similar, thus this stage I
Still claim A, B phase is three level modes, and C phase is two level modes.
As shown in figure 12, according to the needs of control, in the state, the electric current (or voltage) of A, B phase may meet
Control needs, therefore the pwm control signal of the 9th switching tube Q9 and the tenth switching tube Q10 is closed, then the two-phase is originally from straight
The reduction voltage loop for flowing side disconnects, while inductance L1, L2 exit energy storage mode, and the electromotive force of inductance reversely releases energy, and at this time the
The anti-and diode of seven switching tube Q7 and the 8th switching tube Q8 by positively biased voltage turn-on, switch to release can freewheeling mode, i.e. A, B phase
Current direction remains unchanged, and electric current passes through the anti-and diode continuousing flow of the 7th switching tube Q7 and the 8th switching tube Q8 from DC side,
Using first switch tube Q1, the first inductance L1, output terminals A phase (or filter end of A phase) load is reached, electric current passes through B
Phase (or filter end of B phase) and the second inductance L2, return to the 5th switching tube Q5, return the 8th switching tube Q8.And C phase is such as
Fruit does not stop, and still maintains primary current, is connected by the anti-and diode of the 6th switching tube Q6 with the 5th switching tube Q5
Afterflow, i.e. electric current constitute continuous current circuit with B phase.At this point, the state of A phase B phase is then electric with the double boost of traditional equivalent three level
Road or the work of I type tri-level circuit are consistent, and the state of C phase is still similar with two traditional level, thus the stage I
Claim A, B phase is three level modes, and C phase is two level modes.
If C phase inductance energy storage is less likely to stop in advance according to control condition, when electric current approached discontinuously or
Reversely, and the electric current of A phase B phase will continue to maintain afterflow, then at this time if the synchronous rectification signal for having out the 6th switching tube Q6
Driving can be closed, current loop is because the anti-and diode of the 6th switching tube Q6 is interrupted by reverse-biased meeting nature, on L3 inductance
Electric current also return zero.Associated loop is as shown in figure 13 at this time, under AB two-phase then can be considered that three level modes, C phase wait naturally
Fig. 2 mode of a cycle.
In conclusion that in PWM working condition is only Q3, Q9 and Q10 during segment ACO works.
And the switching voltage stress that Q9, Q10 are born is lower, the turning-on voltage stress of Q3 is relatively low.Others conducting is two poles
The synchronous rectification of pipe either switching tube.Therefore switching loss is obviously dropped compared to traditional three level of three phase full bridge or T-shape
It is low.
It because between C phase has been changed to minus zone, but still is that belong to amplitude lower, according to decompression principle, A in OBC sections of sections
Phase B phase relatively can be longer than C phase from DC side inversion turn-on time, therefore C phase then needs that change will be switched in each switch periods
The correspondence switching tube changed on bridge discharges inductive energy storage again and carries out afterflow after being turned off, so in the section, except the company of institute of C phase
The rectifier bridge connect needs the switching tube opened to become outside the 6th switching tube Q6, and the associated loop and working principle of A, B two-phase are with before
It states almost without transformation, therefore interlock circuit working principle is not stated tired.Its schematic diagram no longer faithful representation.The segment process
In in PWM working condition be Q6, Q9 and Q10.
As shown in the following table 5 and 6, with the passage of phase, when each phase voltage enters other segments together, class like this
Push away, each segment work in PWM mode only have the 9th switching tube Q9 and the tenth switching tube Q10 and with three-phase alternating current source amplitude
Switching tube is corresponded in the lower transformation bridge being connected of absolute value.When delivering stream as direct current, the current potential more than one of DC terminal offer
The power supply of (level) includes intermediate current potential (level) in DC side, current potential (level) V11 of first capacitor C11 anode, the
Cathode potential (level) V12 of two capacitor C12 amounts to 3 current potentials (level).Therefore the switch above-mentioned for working in PWM state
Tube efficiency obtains the advantages of three level, while again more succinct than three conventional level, and avoids the high switching voltage of two level
Stress drawback in the case where taking into account efficiency, and has taken into account price, facilitates design.
In some alternative embodiments in the present embodiment, in above process, if working as switching tube to reduce loss
Anti- and diode operation and rectification on state when, driving can also be applied to it and reach synchronous rectification effect.It can obtain
Low conducting voltage is taken, is improved efficiency.
Table 5, inverse switch pipe driving condition one
Above table indicates the PWM mode of main switching tube during the work time, and "high" expression applies always driving signal
It is held on corresponding switching tube；Space indicates not open-minded.
Table 6, inverter mode one
In addition in above-mentioned state and switching mode, in addition to synchronous rectification signal can be implemented, to further decrease switch
The conduction loss of pipe, for the switching tube in transformation bridge arm, i.e., the switching tube first switch tube in space is to the 6th switch Q1 in table 5
~Q6 can also apply pwm signal to the switching tube not turned in the bridge arm, inductance be made to release when inductance L releases energy freewheeling period
Energy continuous current circuit is shorter, or forms the shunting with primary current circuit according to impedance loop size.I.e. former schematic diagram 12 is applying
Associated loop signal such as Figure 14 after above-mentioned driving signal；In view of opening and the switching loss of shutdown moment, it is applied to the bridge arm
On driving signal should abide by as far as possible " be first turned off before Q9 and Q10 are opened, Q9 and Q10 shutdown after it is open-minded again " principle
To be optimal, at the same electric current zero or it is reversed before must shut off aforementioned signal.Illustrate the correspondence instantaneously PWM in short-term with " S-W "
Driving；So switch state table above-mentioned and rectification mode can be expressed as table 7 and table 8 again.
Table 7, inverse switch pipe driving condition one
Table 8, inverter mode two
" composite mode " in table refer to original similar three level mode in this state, the switching tube for converting bridge is being applied
After adding " S-W " signal, there are the similar effects of two level of three phase full bridge again, so we term it " composite modes ".
Exchange either above-mentioned is changed into direct current or DC inversion is to use the composite mode in the function of exchange
When, it can significantly find that the circuit hardware framework provides traditional three level and two the level circuits respectively independent electricity not having
Stream is gone the same way, to provide from hardware, " due to Q9, the end DC has been kept apart in the presence of Q10, therefore has three phase full bridge inductance
Short access (low conduction loss) advantage when energy storage, that is, avoid the high conduction loss disadvantage of " I " three level；Simultaneously because Q7,
The presence of Q8 in turn avoids the high switching voltage stress (high switching loss) of three phase full bridge, that is, realizes the low switching losses of three level
Advantage ".
Above-mentioned state and integrated mode are only conventional in the ideal situation, this circuit is when realizing rectification function, at this
In the process, may exist it is dynamic or other the case where, it is therefore possible to which needs can be controlled according to practical, be formed other
Current loop combination and control method.Or above-mentioned optimal drive mode principle is not used, and use the mode being previously mentioned
Transformation combination is carried out, is also also possible to achieve the effect that optimize compared to traditional circuit performance.Relevant control mode present case can not
It is exhaustive herein, do not represent limitation of the present invention.
In some alternative embodiments of the present embodiment, when this translation circuit is only used as direct current to turn exchange conversion, because
7th switching tube Q7 and the 8th switching tube Q8 only play afterflow, it is possible to which the 7th, the 8th switching tube is substituted for respectively
Nine diode D7 and the tenth diode D8；The cathode of 7th diode and first, second, third source electrode and the 9th switching tube
Drain electrode is connected, and the anode of the 8th diode is connected with the 4th, the five, the 6th drain electrode and the source electrode of the 8th switching tube, and the eight or two
The cathode of pole pipe D8 is connected with the anode of the 7th diode D7.
In the present embodiment, the midpoint of DC side D11, D12 can also be connected with the N line for exchanging side offer, if connection N
When, remember the unilateral highest amplitude V of three-phase alternating voltage, the total voltage V11-V12 setting of DC source DC11+DC12 then should
Higher than 2*V；Compared to aforementioned switches method, when doing rectifying conversion, the 7th switching tube Q7 and the 8th switching tube Q8 can be controlled individually
System, it can go to constitute current loop by the N line, compare aforementioned switches method, the 9th switching tube Q9 when doing inversion transformation
Can also individually be controlled with the tenth switch Q10, i.e., afterflow when can also pass through the N line constitute current loop.But overall control
The variation of method and thinking and aforementioned essence processed.
In addition, when carrying out aforementioned AC-DC conversion, if the 7th switching tube to the tenth switching tube Q7 in the translation circuit
~Q10 (or the 7th to the tenth diode D7~D10) is preferable using switch performance under conditions of keeping same conduction impedance
Device, the working frequency of this circuit can also be greatly improved, to improve the power density of converter, and relative power dissipation
Will not significant change, i.e., only need the part of devices to have preferable switch performance that can reach traditional three phase inversion of high-performance electricity
The effect on road, the benefit are that former three phase full bridge or tri-level circuit cannot be looked forward to completely for the cost performance of converter is promoted
And.The circuit is skillfully constructed and has new meaning in summary, and obtains larger benefit.
It would be recognized by those skilled in the art that it is possible for making numerous accommodations to above description, so embodiment is only
For describing one or more particular implementations.
It is counted as example embodiment of the invention although having been described and describing, it will be apparent to those skilled in the art that
It can be variously modified and is replaced, without departing from spirit of the invention.Furthermore it is possible to make many modifications with will be special
Condition of pledging love is fitted to religious doctrine of the invention, without departing from invention described herein central concept.So the present invention is unrestricted
In specific embodiment disclosed herein, but the present invention may further include belonging to all embodiments of the scope of the invention and its being equal
Object.
Claims (11)
1. a kind of alternating current-direct current two-way changing circuit, which is characterized in that including three phase inversion bridges, first switch group and second switch
Group；Input terminal of the input terminal of the three phase inversions bridge as the circuit, connect with external alternating current source, three phase line difference
The input terminal of the three phase inversions bridge is connected, the output end of the three phase inversions bridge is opened with the first switch group and second respectively
The input terminal of pass group connects；The centre cap of the first switch group and the output end of the second switch group are as the circuit
Output end, the circuit symmetrical that the first switch group and second switch group are constituted；It is described when being converted into direct current for exchanging
Three phase inversion bridges are three-phase rectification bridge, and the first switch group is boosted switch group, and the second switch group is that boosting afterflow is opened
Pass group；When being converted into exchange for direct current, the three phase inversions bridge is three phase inverter bridge, and the first switch group is that decompression is continuous
Switching group is flowed, the second switch group is step-down switching group.
2. circuit as described in claim 1, which is characterized in that the three phase inversions bridge includes the first to the 6th switching tube, institute
State first switch group include the 7th to the 8th switching tube, the second switch group include the 9th to the tenth switching tube, described first
Switching tube and the 4th switching tube are arranged on same bridge arm, and second switch and the 5th switching tube are arranged on same bridge arm, the
Three switching tubes and the 6th switching tube are also disposed on same bridge arm；Described first to third switching tube source electrode, the described 7th open
The source electrode for closing pipe is connected with the drain electrode of the 9th switching tube, the drain electrode of the 4th to the 6th switching tube, the 8th switch
The drain electrode of pipe is connected with the source electrode of the tenth switching tube, the drain electrode of the 7th switching tube and the source electrode of the 8th switching tube
Centre cap after connection as the first switch group, the drain electrode of the source electrode and the tenth switching tube of the 9th switching tube
Output end as the second switch group.
3. circuit as claimed in claim 2, which is characterized in that further include alternating current source, first to third inductance, the first to the second
Capacitor, described first to third inductance connect with the input terminal of the three phase inversions bridge respectively；It is described 9th switch source electrode with
The anode of the first capacitor is connected；The drain electrode of tenth switch is connected with the cathode of second capacitor, the 7th switching tube
Drain electrode and the source electrode of the 8th switching tube be connected with the anode of the cathode of first capacitor and the second capacitor.
4. circuit as claimed in claim 3, which is characterized in that alternating current source triple line and described first to third inductance it
Between be also connected with filter.
5. circuit as claimed in claim 3, which is characterized in that it further include the first to the second DC source, first DC source
The anode of one end and the first capacitor connect, the other end and the cathode of the first capacitor, the anode of the second capacitor and
One end of second DC source connects, and the other end of second DC source is connect with the cathode of the second capacitor.
6. circuit as claimed in claim 5, it is characterised in that: one end of the other end of the first DC source and the second DC source is equal
It is connect with N line, wherein the total voltage of the first to the second DC source is higher than twice of the unilateral highest amplitude of three-phase alternating voltage.
7. circuit as claimed in claim 2, which is characterized in that the 7th to the tenth switching tube opening to the 6th switching tube than first
It is fast to close speed.
8. circuit as claimed in claim 2, which is characterized in that when being converted into direct current for exchanging, the 9th to the tenth switch
Pipe is diode；When being converted into exchange for direct current, the 7th to the 8th switching tube is diode.
9. such as the control method of the described in any item circuits of claim 2-8 characterized by comprising
According to the segment of three-phase ac signal described in the phase of three-phase ac signal of exchange side, voltage magnitude Relation acquisition,
To each phase voltage under current interval section compared with the voltage of setting, the two-phase voltage for meeting natural commutation turn-on condition is respectively right
Switching tube on Ying Yusan phase inversion bridge is connected, and the circuit for realizing exchange conversion at direct current function when,
To the 7th to the 8th switching tube apply pwm control signal, the circuit for realizing DC converting at exchange function when, it is right
9th to the tenth switching group applies pwm control signal, so that the two-phase voltage constitutes circuit；It is unsatisfactory for natural commutation turn-on condition
A phase voltage, applied by one in two switching tubes on the bridge arm to the three phase inversions bridge corresponding with the phase voltage
Add pwm control signal, the phase alternating current source for keeping it opposite with amplitude in the two-phase voltage constitutes current loop.
10. method as claimed in claim 9, it is characterised in that: in the circuit for realizing exchange conversion at the function of direct current
Can when, the switching tube that does not turn on into three phase inversions bridge, first to the 6th switching tube applies driving signal, so that described the
One to the 6th switching tube is open-minded again after the 7th to the 8th switching tube is opened, and turns off in the 7th to the 8th switching tube
Before be first turned off.
11. method as claimed in claim 9, it is characterised in that: in the circuit for realizing DC inversion at the function of exchange
Can when, the switching tube that does not turn on into three phase inversions bridge, first to the 6th switching tube applies driving signal, so that described the
One to the 6th switching tube is open-minded again after the 9th to the tenth switching tube shutdown, and before the 9th to the tenth switching tube is opened first
Shutdown.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112511015A (en) * | 2020-12-07 | 2021-03-16 | 东北电力大学 | Three-phase double-Trans-quasi-Z-source network three-level indirect matrix converter topological structure |
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