CN106533217B - Rectifier, rectification circuit and its control method - Google Patents
Rectifier, rectification circuit and its control method Download PDFInfo
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- CN106533217B CN106533217B CN201611241251.4A CN201611241251A CN106533217B CN 106533217 B CN106533217 B CN 106533217B CN 201611241251 A CN201611241251 A CN 201611241251A CN 106533217 B CN106533217 B CN 106533217B
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
Abstract
The invention discloses a kind of rectifier, rectification circuit and its control methods.The rectification circuit includes: transformer, one-way conduction element D1, D2 and the D3 successively connected in the same direction, DC bus capacitor C1, C3 for successively connecting in the same direction and DC bus capacitor unit C2, switch element Q11, Q12 of two differential concatenations and switch element Q21, Q22 of two differential concatenations.The rectification circuit can reduce grid-connected harmonic wave compared with three level rectifying circuits and can use less switching device compared with five level rectifying circuits.
Description
Technical field
The invention belongs to commutation technique field more particularly to a kind of rectifiers, rectification circuit and its control method.
Background technique
Traditional multi-level rectifying topology is three level rectifying circuits or five level rectifying circuits, and three level rectifying circuits are simultaneously
Net harmonic wave is more compared with five level rectifying circuits, and the device that five level rectifying circuits use is more compared with three level rectifying circuits.
Summary of the invention
The embodiment of the invention provides a kind of rectifier, rectification circuit and its control methods, can be compared with three level rectifyings electricity
It reduces grid-connected harmonic wave and less switching device can be used compared with five level rectifying circuits in road.
In a first aspect, provide a kind of rectification circuit, including transformer, the one-way conduction element D1 that successively connects in the same direction,
D2 and D3, DC bus capacitor C1, the C2 successively connected in the same direction and DC bus capacitor unit C3, the switch element of two differential concatenations
Switch element Q21, Q22 of Q11, Q12 and two differential concatenations, wherein transformer includes positive half of winding T11 and negative half
Side winds T12；The cathode and anode of one-way conduction element D2 is connected with positive half of winding T11 and negative half of winding T12 respectively；
The cathode of one-way conduction element D1 is connected with the anode of DC bus capacitor C1, and the cathode of one-way conduction element D2 is anti-by two
It is connected to concatenated switch element Q11, Q12 with the anode of DC bus capacitor unit C2, the anode of one-way conduction element D2 is logical
Switch element Q21, the Q22 for crossing two differential concatenations are connected with the cathode of DC bus capacitor unit C2, one-way conduction element D3
Anode be connected with the cathode of DC bus capacitor C3.
Second aspect provides a kind of control method of rectification circuit, is used for above-mentioned rectification circuit, comprising: obtains direct current
The step of current level size at the both ends lateral capacitance C1 and C3；Current level size based on the both ends DC bus capacitor C1 and C3 and
Target sizes and capacitor C1, capacitor C2, capacitor C3 capacitance and transformer equivalent inductance size, calculate switch element Q11,
The step of duty ratio of switch element Q12, switch element Q21 and switch element Q22；And according to duty ratio to switch element
Q11, switch element Q12, switch element Q21 and switch element Q22 carry out being switched on and off control, obtain DC bus capacitor C1 and
The step of target level at the both ends C3.
The third aspect provides a kind of rectifier, including above-mentioned rectification circuit, an AC input cell and four direct currents
Output unit, AC input cell are connected with the transformer of rectification circuit, and four DC output units are electric with DC side respectively
Hold C1 to be connected with the positive and negative anodes of capacitor C3.
Fourth aspect provides a kind of rectifier, including three above-mentioned rectification circuits in parallel, three AC input cells
With four DC output units, three AC input cells are used to input Three-phase alternating current signal respectively, in parallel with three respectively
The transformer of rectification circuit be connected, the DC bus capacitor of four DC output units rectification circuit in parallel with three respectively
C1 is connected with the positive and negative anodes of capacitor C3.
Rectifier, rectification circuit and its control method provided according to embodiments of the present invention, by being arranged and exchanging input
Positive one side of something is wound connected being provided in end and the transformer of negative one side of something winding realizes the rectification circuit by magnetic circuit energy transfer
Two exchange grid entry points realized by being arranged and controlling the on-off of switch element in rectification circuit at the both ends of three capacitors
Four level are formed, is had and is reduced grid-connected harmonic wave compared with three level rectifying circuits and can be opened compared with five level rectifying circuits using less
The advantages of closing device, while the rectification circuit has not only saved cost due to using less electric elements, but also avoids
Electric elements are more to lead to the technical issues of increasing the encapsulation difficulty of circuit.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, it should be apparent that, drawings described below is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of topological diagram of four level rectifying circuits；
Fig. 2 is the topological diagram of the rectification circuit of one embodiment of the present of invention；
Fig. 3 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the first operation mode；
Fig. 4 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the second operation mode；
Fig. 5 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of third operation mode；
Fig. 6 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the 4th operation mode；
Fig. 7 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the 5th operation mode；
Fig. 8 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the 6th operation mode；
Fig. 9 is a kind of method flow diagram of the control method of the rectification circuit of embodiment of the invention；
Figure 10 is a kind of schematic block diagram of the rectifier of embodiment of the invention；
Figure 11 is the schematic block diagram of the rectifier of another embodiment of the invention；
Figure 12 is a kind of exemplary application schematic diagram of the rectification circuit of embodiment of the invention；
Figure 13 is the exemplary application schematic diagram of the rectification circuit of another embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation
The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.The present invention never limits
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of component and algorithm.In the the accompanying drawings and the following description, well known structure and skill is not shown
Art is unnecessary fuzzy to avoid causing the present invention.
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the present invention more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.In the figure in order to clear
It is clear, it may be exaggerated the thickness of region and layer.Identical appended drawing reference indicates same or similar structure in figure, thus will save
Slightly their detailed description.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In example.In the following description, many details are provided to provide and fully understand to the embodiment of the present invention.However,
It will be appreciated by persons skilled in the art that technical solution of the present invention can be practiced without one in the specific detail or more
It is more, or can be using other methods, constituent element, material etc..In other cases, be not shown in detail or describe known features,
Material or operation are to avoid major technique intention of the invention is obscured.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 is a kind of topological diagram of four level rectifying circuits.As shown in Figure 1, the four level rectifyings circuit includes mutually going here and there
The switch element Q1 of connection, switch element Q2, switch element Q3, switch element Q4, switch element Q5 and switch element Q6, direct current are defeated
Capacitor C1 ', capacitor C2 ' and the capacitor C3 ' that side is serially connected out, wherein switch element Q2, switch element Q3 and switch element Q4
It is parallel with two one-way conduction elements being serially connected, the tie point of two one-way conduction elements and the anode of capacitor C2 ' in the same direction
It is connected, switch element Q3, switch element Q4 and switch element Q5 are parallel with two one-way conduction elements being serially connected in the same direction,
The tie point of two one-way conduction elements is connected with the cathode of capacitor C2 ', further includes inductance T12 ', one end and switch element Q3
It is connected with the tie point of switch element Q4, the other end is connected with ac input end at work, and four level are respectively formed
At the two poles of the earth of capacitor C1 ' and capacitor C3 '.
It can be seen that although above-mentioned four level rectifyings circuit can reduce grid-connected harmonic wave compared with three level rectifying circuits,
The electric elements of use are still more, thus increase the cost of rectification circuit and its application circuit, and due to semiconductor devices
The technical issues of quantity is more to lead to increase the encapsulation difficulty of rectification circuit and its application circuit.
Fig. 2 is the topological diagram of the rectification circuit of one embodiment of the present of invention.The rectification circuit, including transformer, successively
One-way conduction element D1, D2 and the D3 connected in the same direction, DC bus capacitor C1, the C2 and DC bus capacitor unit successively connected in the same direction
C3, switch element Q11, Q12 of two differential concatenations and switch element Q21, Q22 of two differential concatenations, wherein assuming that
DC bus capacitor C1 just extremely the first level is indicated with H, DC bus capacitor unit C2 anode and cathode be respectively second electricity
Gentle third level indicates that the cathode of DC bus capacitor C3 is that the 4th level is indicated with L with MH and ML respectively.Transformer with exchange
The tie point of input terminal is indicated with AC.Transformer includes positive one side of something winding T11 and negative half of winding T12；One-way conduction element D2
Cathode and anode be connected respectively with positive half of winding T11 and the negative half of T12 that winds；The cathode of one-way conduction element D1 and straight
The anode of stream lateral capacitance C1 is connected, and the cathode of one-way conduction element D2 passes through switch element Q11, Q12 of two differential concatenations
It is connected with the anode of DC bus capacitor unit C2, the anode of one-way conduction element D2 passes through the switch element of two differential concatenations
Q21, Q22 are connected with the cathode of DC bus capacitor unit C2, the anode of one-way conduction element D3 and bearing for DC bus capacitor C3
Pole is connected.By the way that the transformer for being provided with positive half of winding and negative half of winding being connected with ac input end is arranged, pass through
Magnetic circuit energy transfer realizes two exchange grid entry points of the rectification circuit, by being arranged and controlling switch element in rectification circuit
On-off, realize and form four level at the both ends of three capacitors have and reduce grid-connected harmonic wave compared with three level rectifying circuits and can
The advantages of using less switching device compared with five level rectifying circuits, while the rectification circuit is due to using less electric appliance member
Part has not only saved cost, and avoid electric elements it is more cause increase circuit encapsulation difficulty the technical issues of.
In some instances, the transformer in the rectification circuit from inductance value can be three level rectifying circuits or two level
The grid-connected inductance value in exchange side of rectification circuit.It is, for example, possible to use the lesser transformers of self-induction, can be by three level from inductance value
The design of the grid-connected inductance value of rectification circuit or two level rectifying circuits obtains.When needing to export the level of high potential capacitor, electricity
It flows and is flowed through from the positive half of winding T11 of transformer, negative half of winding T12 is equivalent to open circuit due to impedance limit.Transformation at this time
Device plays metering function from inductance value；Switch when from aforesaid state, when needing to export the level of low potential capacitor, due to magnetic circuit coupling
It closes, transformer positive half of winding T11 electric current moment becomes zero, and is transferred to the negative half of winding T12 output of transformer, and numerical value is constant.
By above-mentioned magnetic circuit energy transfer, which can be realized two exchange grid entry points of the rectification circuit.
In some instances, switch element may include insulated gate bipolar transistor, metal oxide field effect crystal
Pipe or integrated gate commutated thyristor.In some instances, one-way conduction element can be diode.
Fig. 3 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the first operation mode.As shown in figure 3,
When the rectification circuit is in the first operation mode: switch element Q11, Q12, Q21 and Q22 are turned off, and exchange side voltage is positive value,
Electric current flows into anode of the one-way conduction element D1 in DC bus capacitor C1 by the positive half of winding T11 of transformer and forms the first level H.
For example, electric current is the positive half of winding T11 of inflow transformer when ac output end voltage is positive value, work as switch element at this time
Q11, Q12, Q21 and Q22 are turned off, and as shown in the directive heavy line of tool in Fig. 3, electric current flows through the positive half of winding of transformer
The anode of T11, unit breakover element D1 in DC bus capacitor C1 forms the first level H.
Fig. 4 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the second operation mode.As shown in figure 4,
When the rectification circuit is in the second operation mode: switch element Q11 and switch element Q12 are open-minded, switch element Q21 and switch member
Part Q22 shutdown, electric current flow through switch element Q11 and switch element Q12 in DC bus capacitor list by the positive half of winding T11 of transformer
The anode of first C2 forms second electrical level MH.For example, when switch element Q11 is connected with Q12, when switch element Q21 and Q22 are turned off,
Second electrical level MH is formed in the anode of DC bus capacitor C2, as shown in the directive heavy line of tool in Fig. 4, electric current flows through transformation
Device positive half of winding T11, switch element Q11 and Q12, it should be noted that due to having conduction voltage drop on one-way conduction element D2,
Electric current is caused not flow through the negative half of winding T12 and one-way conduction element D2 of transformer.
Fig. 5 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of third operation mode；As shown in figure 5,
When the rectification circuit is in third operation mode: switch element Q11 and switch element Q12 shutdown, switch element Q21 and switch member
Part Q22 is open-minded, on the positive half of winding T11 of transformer in energy transfer to the negative half of winding T12 of transformer, such as having in Fig. 5
Shown in the heavy line in direction, electric current is flowed into through the negative half of winding T12 of transformer straight by switch element Q22 and switch element Q21
The cathode for flowing lateral capacitance unit C2 forms third level.For example, when switch element Q11 and Q12 are turned off, switch element Q21 and Q22
When connection, third level ML is formed in the cathode of DC bus capacitor unit C2, when switch element Q21 is connected with Q22, transformer is just
On one side of something winding T11 in energy transfer to negative half of winding T12, electric current flows through switch element Q22, switch element Q21 and transformation
The negative half of winding T12 of device.
Fig. 6 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the 4th operation mode；As shown in fig. 6,
When the rectification circuit is in four operation modes: switch element Q11, Q12, Q21 and Q22 are turned off, as having direction in Fig. 6
Heavy line shown in, electric current is by the negative half of winding T12 of one-way conduction element D3 inflow transformer, in the cathode of DC bus capacitor C3
Form the 4th level L.For example, electric current is the negative one side of something for flowing out transformer when ac output end voltage is low with respect to MH level
T12 is wound, when switch element Q11, Q12, Q21 and Q22 shutdown, forms the 4th level L, electricity in the cathode of DC bus capacitor C3
Stream flows through one-way conduction element D3 and the negative half of winding T12 of transformer.
Fig. 7 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the 5th operation mode.As shown in fig. 7,
When the rectification circuit is in five operation modes: switch element Q11 and switch element Q12 shutdown, switch element Q21 and switch member
Part Q22 is connected, and as shown in the directive heavy line of tool in Fig. 7, electric current is flowed by switch element Q22 and switch element Q21 to be become
The negative half of winding T12 of depressor, forms third level in the cathode of DC bus capacitor unit C2.Wherein, due to one-way conduction element
There is conduction voltage drop on D2, electric current is caused not flow through the positive half of winding T11 and one-way conduction element D2 of transformer.
Fig. 8 is that the rectification circuit of one embodiment of the present of invention is in the topological diagram of the 6th operation mode.As shown in figure 8,
When the rectification circuit is in six operation modes: switch element Q11 and switch element Q12 conducting, switch element Q21 and switch member
Part Q22 shutdown, the negative one side of something of transformer are wound on T12 in energy transfer to the positive half of winding T11 of transformer, such as having in Fig. 8
Shown in the heavy line in direction, electric current is by the positive half of winding T11 of transformer, switch element Q11 and switch element Q12 in DC side electricity
The anode for holding unit C2 forms second electrical level.
Above in conjunction with Fig. 2 to Fig. 8, rectification circuit according to an embodiment of the present invention and its each work is described in detail
Mode.Below in conjunction with Fig. 9, the control method of rectification circuit according to an embodiment of the present invention is described in detail, the rectification circuit
Control method is calculated according to the target level size at DC bus capacitor both ends obtains switch element Q1, switch element Q2, switch member
The duty ratio appropriate of part Q3 and switch element Q4, the size so as to realize four level to rectification circuit output are timely
Between controlled.
Fig. 9 is a kind of method flow diagram of the control method of the rectification circuit of embodiment of the invention.As shown in figure 9, should
The control method of rectification circuit is used for above-mentioned rectification circuit, comprising: S910 obtains the current of the both ends DC bus capacitor C1 and C3
Level；S920, current level size and target sizes and capacitor C1, capacitor based on the both ends DC bus capacitor C1 and C3
The equivalent inductance size of C2, capacitor C3 capacitance and transformer calculate switch element Q11, switch element Q12, switch element Q21
With the duty ratio of switch element Q22；And S930, according to duty ratio to switch element Q11, switch element Q12, switch element
Q21 and switch element Q22 carries out being switched on and off control, obtains the target level at the both ends DC bus capacitor C1 and C3.It is above-mentioned to account for
The i.e. traceable target voltage values of the DC voltage exported when sky is than being applied to the rectification circuit.By being arranged and controlling rectification circuit
The on-off of middle switch element realizes and forms four level at the both ends of three capacitors have grid-connected compared with the reduction of three level rectifying circuits
Harmonic wave and can compared with five level rectifying circuits use less switching device the advantages of, while the rectification circuit due to use compared with
Few electric elements have not only saved cost, but also avoid the technology of the more encapsulation difficulty for leading to increase circuit of electric elements
Problem.
Figure 10 is a kind of schematic block diagram of the rectifier of embodiment of the invention.As shown in Figure 10, a kind of rectifier 10,
May include 1020, AC input cells 1010 of above-mentioned rectification circuit and four DC output units 1031,1032,
1033,1034, AC input cell 1010 is connected with the transformer of rectification circuit 1020, four DC output units 1031,
1032,1033,1034 are connected with the positive and negative anodes of DC bus capacitor C1 and DC bus capacitor C3 respectively, four DC output units
1031,1032,1033,1034 high level H, higher level MH, lower level ML and low level L can be exported respectively.
Figure 11 is the schematic block diagram of the rectifier of another embodiment of the invention.As shown in figure 11, the rectifier 11,
It may include three above-mentioned rectification circuit 1121,1122,1123, three AC input cells and four direct current output lists in parallel
Member, three AC input cells are used to input Three-phase alternating current signal respectively, respectively the transformation of the rectification circuit in parallel with three
Device is connected, the DC bus capacitor C1 and DC bus capacitor C3 of four DC output units rectification circuit in parallel with three respectively
Positive and negative anodes be connected.For example, three AC input cells are respectively that three AC input cell a phases, 1111, three exchanges are defeated
Enter unit b phase 1112 and three AC input cell c phases 1113, above three AC input cell can be inputted respectively at exchange
The three-phase alternating current at end is connected.For example, four DC output units can be respectively the capacitor in three AC input cells
The positive and negative anodes of C1 and capacitor C3, four DC output units 1131,1132,1133,1134 can export high level H respectively, compared with
High level MH, lower level ML and low level L.
Figure 12 is a kind of exemplary application schematic diagram of the rectification circuit of embodiment of the invention.As shown in figure 12, including
AC power source 121 and rectification circuit 122, wherein AC power source 121 is single phase alternating current power supply, and rectification circuit 122 includes, successively
One-way conduction element D1, D2 and the D3 connected in the same direction, DC bus capacitor C1, C2a, C2b and the C3 successively connected in the same direction, two anti-
To concatenated switch element Q11, Q12 and switch element Q21, Q22 of two differential concatenations, wherein assuming that DC bus capacitor
C1 just extremely the first level is indicated with H, the anode and C2b cathode of DC bus capacitor unit C2a is respectively second electrical level and the
Three level indicate that the cathode of DC bus capacitor C3 is that the 4th level is indicated with L with MH and ML respectively.Transformer and AC power source
121 input terminal is connected, the tie point of the anode and C2b of the output end of AC power source 121 and DC bus capacitor unit C2a to
It is grounded after connection.Transformer includes positive one side of something winding T11 and negative half of winding T12；The cathode and anode of one-way conduction element D2
It is connected respectively with positive half of winding T11 and negative half of winding T12；The cathode of one-way conduction element D1 is with DC bus capacitor C1's
Anode is connected, and the cathode of one-way conduction element D2 passes through switch element Q11, Q12 and DC bus capacitor of two differential concatenations
The anode of unit C2a is connected, and the anode of one-way conduction element D2 passes through switch element Q21, Q22 of two differential concatenations and straight
The cathode of stream lateral capacitance unit C2b is connected, and the anode of one-way conduction element D3 is connected with the cathode of DC bus capacitor C3.
Figure 13 is the exemplary application schematic diagram of the rectification circuit of another embodiment of the invention.As shown in figure 13,
In, AC power source 131, AC power source 132 and AC power source 133 are respectively at rectification circuit 134, rectification circuit 135, rectification circuit
136 input terminal is connected, and AC power source 131, AC power source 132 and AC power source 133 export three-phase alternating current respectively.It is whole
Current circuit 134, rectification circuit 135, the capacitor C1 of rectification circuit 136 and capacitor C3 positive and negative anodes can export high level H respectively,
Higher level MH, lower level ML and low level L.It should be noted that above-mentioned example application is above-mentioned rectification circuit
Some exemplary illustrations of application circuit, it is not limited in the application of both the above circuit.
It needs to define, the invention is not limited to specific configuration described above and shown in figure and processing.Also,
For brevity, the detailed description to known method technology is omitted here.In the above-described embodiments, it has been described and illustrated several
Specific step is as example.But method process of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified after understanding spirit of the invention, modification and addition, or between changing the step
Sequentially.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (15)
1. a kind of rectification circuit, which is characterized in that including transformer, one-way conduction element D1, D2 and the D3 successively connected in the same direction,
DC bus capacitor C1, the C2 and DC bus capacitor C3, switch element Q11, Q12 of two differential concatenations successively connected in the same direction, with
And switch element Q21, Q22 of two differential concatenations, wherein
The transformer includes positive one side of something winding T11 and negative half of winding T12；
The cathode of the one-way conduction element D2 is connected with one end of the positive half of winding T11；
The anode of the one-way conduction element D2 is connected with one end of the negative half of winding T12；
The other end of the other end of the positive half of winding T11 and the negative half of winding T12 are connected with ac input end；
The cathode of the one-way conduction element D1 is connected with the anode of DC bus capacitor C1, and the one-way conduction element D2's is negative
Pole is connected by switch element Q11, Q12 of two differential concatenations with the anode of DC bus capacitor C2, the one-way conduction member
The anode of part D2 is connected by switch element Q21, Q22 of two differential concatenations with the cathode of DC bus capacitor C2, the list
It is connected to the anode of breakover element D3 with the cathode of the DC bus capacitor C3；
The anode of the one-way conduction element D1 is connected with the cathode of the one-way conduction element D2；
The cathode of the one-way conduction element D3 is connected with the anode of the one-way conduction element D2.
2. rectification circuit according to claim 1, which is characterized in that the transformer is that three level rectifyings are electric from inductance value
The grid-connected inductance value in exchange side of road or two level rectifying circuits.
3. rectification circuit according to claim 1 or 2, which is characterized in that the switch element includes insulated gate bipolar
Transistor, MOS memory or integrated gate commutated thyristor.
4. rectification circuit according to claim 1 or 2, which is characterized in that the one-way conduction element is diode.
5. rectification circuit according to claim 1 or 2, which is characterized in that the operation mode of the rectification circuit includes the
One operation mode: switch element Q11, Q12, Q21 and Q22 are turned off, and exchange side voltage is positive value, and electric current is just half of by transformer
It winds T11 and flows into one-way conduction element D1 in anode the first level of formation of DC bus capacitor C1.
6. rectification circuit according to claim 5, which is characterized in that the operation mode of the rectification circuit includes the second work
Make mode: switch element Q11 and switch element Q12 are open-minded, and switch element Q21 and switch element Q22 shutdown, electric current is by transformer
Positive half of winding T11 flows through the anode of switch element Q11 and switch element Q12 in DC bus capacitor C2 and forms second electrical level.
7. rectification circuit according to claim 6, which is characterized in that the operation mode of the rectification circuit includes third work
Make mode: switch element Q11 and switch element Q12 shutdown, switch element Q21 and switch element Q22 are open-minded, and transformer is just half of
It winds on T11 in energy transfer to the negative half of winding T12 of transformer, electric current is by switch element Q22 and switch element Q21 through transformation
The negative half of winding T12 of device flows into the cathode formation third level in DC bus capacitor C2.
8. rectification circuit according to claim 7, which is characterized in that the operation mode of the rectification circuit includes the 4th work
Make mode: switch element Q11, Q12, Q21 and Q22 are turned off, electric current by one-way conduction element D3 inflow transformer it is negative half of around
T12 is hindered, forms the 4th level in the cathode of DC bus capacitor C3.
9. rectification circuit according to claim 8, which is characterized in that the operation mode of the rectification circuit includes the 5th work
Make mode: switch element Q11 and switch element Q12 shutdown, switch element Q21 are connected with switch element Q22, and electric current is by switch member
The part Q22 and negative half of winding T12 of switch element Q21 inflow transformer, forms third level in the cathode of DC bus capacitor C2.
10. rectification circuit according to claim 9, which is characterized in that the operation mode of the rectification circuit includes the 6th
Operation mode: switch element Q11 and switch element Q12 conducting, switch element Q21 and switch element Q22 shutdown, transformer negative half
Side is wound on T12 in energy transfer to the positive half of winding T11 of transformer, and electric current is by transformer positive half of winding T11, switch element
Anode of the Q11 and switch element Q12 in DC bus capacitor C2 forms second electrical level.
11. rectification circuit according to claim 10, which is characterized in that first level is greater than the second electrical level,
The second electrical level is greater than 0, and the 4th level is less than the third level, and the third level is less than 0.
12. rectification circuit according to claim 1 or 2, which is characterized in that the DC bus capacitor C2 includes concatenated straight
Flow lateral capacitance C2a and DC bus capacitor C2b.
13. a kind of control method of rectification circuit, which is characterized in that be used for the described in any item rectified currents of claim 1 to 12
Road, comprising:
Obtain the current level size at the DC bus capacitor C1 and the both ends C3；
Current level size and target sizes and capacitor C1 based on the DC bus capacitor C1 and the both ends C3, capacitor C2, electricity
The equivalent inductance size for holding C3 capacitance and transformer, calculates the switch element Q11, the switch element Q12, the switch
The duty ratio of element Q21 and the switch element Q22；
According to the duty ratio to the switch element Q11, the switch element Q12, the switch element Q21 and the switch
Element Q22 carries out being switched on and off control, obtains the target level of the DC bus capacitor C1 and the both ends C3.
14. a kind of rectifier, which is characterized in that including the described in any item rectification circuits of a such as claim 1 to 12, one
AC input cell and four DC output units, the AC input cell are connected with the transformer of the rectification circuit,
Four DC output units are connected with the positive and negative anodes of the DC bus capacitor C1 and capacitor C3 respectively.
15. a kind of rectifier, which is characterized in that including three in parallel rectification circuits as described in any one of claim 1 to 12,
Three AC input cells and four DC output units, three AC input cells for inputting three-phase alternating current respectively
Signal is connected with the transformer of three rectification circuits in parallel respectively, four DC output units respectively with institute
The DC bus capacitor C1 for stating three rectification circuits in parallel is connected with the positive and negative anodes of capacitor C3.
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