CN208424233U - Four level topology units of one kind and its application circuit - Google Patents
Four level topology units of one kind and its application circuit Download PDFInfo
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- CN208424233U CN208424233U CN201820703119.9U CN201820703119U CN208424233U CN 208424233 U CN208424233 U CN 208424233U CN 201820703119 U CN201820703119 U CN 201820703119U CN 208424233 U CN208424233 U CN 208424233U
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Abstract
The utility model relates to a kind of four level topology units, the four level topology unit is connected between the anode of DC power supply and cathode, and the four level topology unit includes: first switch unit, second switch unit, third switch unit, the 4th switch unit, the 5th switch unit, the 6th switch unit, the 7th switch unit, the 8th switch unit, the diode for being connected anti-parallel to each switch unit both ends, first capacitor, the second capacitor, third capacitor, the 4th capacitor and current-limiting inductance.Above-mentioned four level topology unit can provide higher alternating voltage in the case where keeping low-loss situation, striding capacitance and partial switch pipe or diode both ends overvoltage can be prevented simultaneously, exchange side cost and loss, the reliability that AC/DC convertor can be effectively reduced are higher.The invention also discloses a kind of application circuits of four level topology units.
Description
Technical field
The utility model relates to power electronics fields, more particularly to a kind of four level topology units and its application electricity
Road.
Background technique
Two-way AC/DC convertor is a kind of direct current energy is converted into AC energy or is converted into AC energy directly
The converter of galvanic electricity energy.Increasingly increase with progress, demand of the mankind to the energy with the continuous development of society, photovoltaic, energy storage etc.
New energy is also increasing in energy specific gravity accounting.As its core, photovoltaic DC-to-AC converter and energy accumulation current converter are in market in recent years
It is also more and more fierce in competition.In order to meet the market demand, more and more more level AC/DC convertors are pushed into market, such as
Four level AC/DC convertors.
It needs to prevent from flying across electricity using measure and biggish absorbing circuit is pressed in traditional four level AC/DC convertors
Appearance and partial switch pipe and diode both ends overvoltage, and topological encapsulating structure is obstructed in traditional four level AC/DC convertors
With being typically necessary in practical applications from newly and encapsulated, thus the problems such as increased costs, poor reliability can be brought.
Utility model content
Based on this, it is necessary to press measure and biggish absorption for needing to use in traditional four level AC/DC convertors
Circuit prevents striding capacitance and partial switch pipe and diode both ends overvoltage, and in traditional four level AC/DC convertors
Topological encapsulating structure is not general, is typically necessary in practical applications from encapsulation is newly done to bring increased costs, reliability
The problem of difference provides four level topology units of one kind and its application circuit.
A kind of four level topology units, the four level topology unit are connected between the anode of DC power supply and cathode,
The four level topology unit includes: first switch unit, second switch unit, third switch unit, the 4th switch unit,
Five switch units, the 7th switch unit, the 8th switch unit, are connected anti-parallel to each switch unit both ends at the 6th switch unit
Diode, first capacitor, the second capacitor, third capacitor, the 4th capacitor and current-limiting inductance, in which:
The first switch unit second end is connected with the DC power anode, first end and the 7th switch unit
First end is connected；
The 7th switch unit second end is connected with the 8th switch unit first end, and tie point is four level
The exchange end of topology unit；
The 8th switch unit second end is connected with the 6th switch unit second end；
The 6th switch unit first end is connected with the DC power cathode；
The second switch unit, third switch unit, the 4th switch unit and the 5th switch unit is sequentially connected in series and it
One end links together with the second end of the first switch unit and the DC power anode, and the other end is opened with the described 6th
The first end and the DC power cathode for closing unit link together；
The first capacitor and the second capacitor are sequentially connected in series and one end is connected to the DC power anode, other end connection
To between the DC power cathode；
Third capacitor one end is connected to the common end of the second switch unit and third switch unit, and the other end connects
It is connected to the common end of the first switch unit and the 7th switch unit；
Described 4th capacitor one end is connected to the common end of the 4th switch unit and the 5th switch unit, and the other end connects
It is connected to the common end of the 6th switch unit and the 8th switch unit；
Described current-limiting inductance one end is connected to the common end of the third switch unit and the 4th switch unit, and the other end connects
It is connected to the common end of the first capacitor and the second capacitor.
There are four kinds of operation modes when the four level topology unit works in one of the embodiments, realize different
AC DC conversion under operating power.
When the four level topology unit work is under first mode in one of the embodiments, the first switch
Unit, third switch unit, the 4th switch unit, the 6th switch unit, the 7th switching means conductive, other switch units are cut
Only.
When the four level topology unit work is under second mode in one of the embodiments, the second switch
Unit, the 4th switch unit, the 6th switch unit, the 7th switching means conductive, other switch unit cut-offs.
When the four level topology unit work is under third mode in one of the embodiments, the first switch
Unit, third switch unit, the 4th switch unit, the 6th switch unit, the 8th switching means conductive, other switch units are cut
Only.
When the four level topology unit work is under the 4th mode in one of the embodiments, the first switch
Unit, third switch unit, the 5th switch unit, the 8th switching means conductive, other switch unit cut-offs.
A kind of application circuit of four level topology unit, including 2 four above-mentioned level topology units, the respectively the 1st
Level topology unit and the two or four level topology unit, the application circuit of the four level topology unit further include the first inductance and
Second inductance, in which:
The first capacitor of one or the four level topology unit and the first capacitor phase of the two or the four level topology unit
It is mutually in parallel；
Second capacitor of the one or the four level topology unit and the second capacitor phase of the two or the four level topology unit
It is mutually in parallel；
The first input end of one or the four level topology unit and the two or four level topology unit with DC power supply just
Extremely it is connected；
Second input terminal of the one or the four level topology unit and the two or four level topology unit is all connected to described
The common end of one capacitor and the second capacitor；
The third input terminal of one or the four level topology unit and the two or four level topology unit is negative with DC power supply
Extremely it is connected；
The output end of one or the four level topology unit is connected with first inductance, the first inductance other end with
AC load first end is connected；
The output end of two or the four level topology unit is connected with second inductance, the second inductance other end with
AC load second end is connected.
The application circuit of the four level topology unit further includes the 5th capacitor in one of the embodiments, and described
Five capacitors are connected in parallel on the AC load both ends.
A kind of application circuit of four level topology unit, including 3 four above-mentioned level topology units, the respectively the 1st
Level topology unit, the two or four level topology unit and the three or four level topology unit, the application of the four level topology unit
Circuit further includes the first inductance, the second inductance and third inductance, in which:
First capacitor, the first capacitor and the three or four of the two or four level topology unit of one or the four level topology unit
The first capacitor of level topology unit is parallel with one another；
The second capacitor and the three or four of second capacitor of the one or the four level topology unit, the two or four level topology unit
Second capacitor of level topology unit is parallel with one another；
One or the four level topology unit, the two or four level topology unit and the three or four level topology unit it is first defeated
Enter end to be connected with DC power anode；
One or the four level topology unit, the two or four level topology unit and the three or four level topology unit it is second defeated
Enter the common end that end is all connected to the first capacitor and the second capacitor；
The third of one or the four level topology unit, the two or four level topology unit and the three or four level topology unit is defeated
Enter end to be connected with DC power cathode；
The output end of one or the four level topology unit is connected with first inductance, the first inductance other end with
First AC load first end is connected；
The output end of two or the four level topology unit is connected with second inductance, the second inductance other end with
Second AC load first end is connected；
The output end of three or the four level topology unit is connected with the third inductance, the third inductance other end with
Third AC load first end is connected；
The first AC load second end, the second AC load second end and third AC load second end are connected to together
One tie point.
The application circuit of the four level topology unit further includes the 5th capacitor, the 6th electricity in one of the embodiments,
Hold and the 7th capacitor, in which:
The 5th capacitor first end is connected between first inductance and first AC load；
The 6th capacitor first end is connected between second inductance and second AC load；
The 7th capacitor first end is connected between the third inductance and the third AC load；
The 5th capacitor second end, the 6th capacitor second end and the 7th capacitor second end are connected to same tie point.
Above-mentioned four level topology unit and its application circuit can provide higher alternating current in the case where keeping low-loss situation
Pressure, while striding capacitance and partial switch pipe or diode both ends overvoltage can be prevented, AC/DC convertor can be effectively reduced
Exchange side cost and loss, other part switching tube takes universal architecture to encapsulate, and cost is lower, and reliability is higher.
Detailed description of the invention
Fig. 1 is the schematic diagram of the four level topology units of the embodiments of the present invention；
Fig. 2 is the schematic diagram of four level topology units of another embodiment of the utility model；
Fig. 3 is equivalent circuit when the four level topology units of the embodiments of the present invention work under first mode
Figure；
Fig. 4 is equivalent circuit when the four level topology units of the embodiments of the present invention work under second mode
Figure；
Fig. 5 is equivalent circuit when the four level topology units of the embodiments of the present invention work under third mode
Figure；
Fig. 6 is equivalent circuit when the four level topology units of the embodiments of the present invention work under the 4th mode
Figure；
Fig. 7 is modulating wave sinusoidal signal C, first carrier signal in the four level topology units of the embodiments of the present invention
A, the second carrier signal B, first switch unit Q1, second switch unit Q2, third switch unit Q3, the 4th switch unit Q4,
5th switch unit Q5, the 6th switch unit Q6, the 7th switch unit Q7, the 8th switch unit Q8 with exchange end AC waveform when
Sequence figure；
Fig. 8 is the functional unit interface diagram of the four level topology units of the embodiments of the present invention；
Fig. 9 is the schematic diagram of the application circuit of the four level topology units of the embodiments of the present invention；
Figure 10 is the schematic diagram of the application circuit of four level topology units of another embodiment of the utility model；
Figure 11 is the schematic diagram of the application circuit of four level topology units of another embodiment of the utility model；
Figure 12 is the schematic diagram of the application circuit of four level topology units of another embodiment of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Referring to Figure 1, Fig. 1 is the schematic diagram of the four level topology units of the embodiments of the present invention.
In the present embodiment, the four level topology unit is connected between the anode of DC power supply and cathode, and described four
Level topology unit include: first switch unit Q1, second switch unit Q2, third switch unit Q3, the 4th switch unit Q4,
5th switch unit Q5, the 6th switch unit Q6, the 7th switch unit Q7, the 8th switch unit Q8 are connected anti-parallel to each switch
The first diode D1 at unit both ends, the second diode D2, third diode D3, the 4th diode D4, the 5th diode D5,
Six diode D6, the 7th diode D7, the 8th diode D8, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th electricity
Hold C4 and current-limiting inductance L1, in which:
The first switch unit Q1 second end is connected with the DC power anode DC+, and first end is opened with the described 7th
Unit Q7 first end is closed to be connected；
The 7th switch unit Q7 second end is connected with the 8th switch unit Q8 first end, and tie point is described four
The exchange end AC of level topology unit；
The 8th switch unit Q8 second end is connected with the 6th switch unit Q6 second end；
The 6th switch unit Q6 first end is connected with the DC power cathode DC-；
The second switch unit Q2, third switch unit Q3, the 4th switch unit Q4 and the 5th switch unit Q5 are successively
It connects and one end links together with the second end of the first switch unit Q1 and the DC power anode DC+, the other end
It links together with the first end of the 6th switch unit Q6 and the DC power cathode DC-；
The first capacitor C1 and the second capacitor C2 is sequentially connected in series and one end is connected to the DC power anode DC+, separately
One end is connected to the DC power cathode DC-；
Described one end third capacitor C3 is connected to the common end of the second switch unit Q2 Yu third switch unit Q3, separately
One end is connected to the common end of the first switch unit Q1 and the 7th switch unit Q7；
The one end the 4th capacitor C4 is connected to the common end of the 4th the switch unit Q4 and the 5th switch unit Q5, separately
One end is connected to the common end of the 6th the switch unit Q6 and the 8th switch unit Q8；
The one end the current-limiting inductance L1 is connected to the common end of the third switch unit Q3 and the 4th switch unit Q4, separately
One end is connected to the common end of the first capacitor C1 and the second capacitor C2.
In the present embodiment, the switch unit is switching tube.In other embodiments, the switch unit can be it
Its element need to only play on-off action.
In the present embodiment, the current-limiting inductance L1 is used to limit the charge and discharge of the third capacitor C3 and the 4th capacitor C4
Electric current.In the present embodiment, the one end the current-limiting inductance L1 is connected to the third switch unit Q3 and the 4th switch unit Q4
Common end, the other end is connected to the common end of the first capacitor C1 and the second capacitor C2.In other embodiments, the limit
Galvanic electricity sense can be can connect in other positions, need to only play metering function to be multiple.
In the present embodiment, the second switch unit Q2, third switch unit Q3, the 4th switch unit Q4, the 5th open
It closes unit Q5 and its I type three-level structure package module can be used in anti-paralleled diode.
In the present embodiment, the 7th switch unit Q7 and the 8th switch unit Q8 and its anti-paralleled diode can be used
Half-bridge structure package module.
In the present embodiment, the connecting pin M1 of the current-limiting inductance L1 is DC power supply midpoint, the first switch unit
The public connecting end of Q1, the 7th switch unit Q7 and third capacitor C3 are M2, the 6th switch unit Q6, the 8th switch unit
The public connecting end of Q8 and the 4th capacitor C4 are M3.
Fig. 2 is referred to, Fig. 2 is the schematic diagram of four level topology units of another embodiment of the utility model.
In the present embodiment, the four level topology unit further includes the 13rd diode D13 and the 14th diode
D14, the 13rd diode D13 and the 14th diode D14 are sequentially connected in series.Specifically, the 13rd diode D13 sun
Pole is connected to the common end of the first capacitor C1 Yu the second capacitor C2, cathode be connected to the second switch unit Q2 and
The common end of third switch unit Q3, the 14th diode D14 anode are connected to the 4th switch unit Q4 and the 5th
The common end of switch unit Q5, cathode are connected to the common end of the first capacitor C1 Yu the second capacitor C2.The present embodiment
In four level topology unit rest parts it is identical as embodiment illustrated in fig. 1, repeat no more.
In the present embodiment, the second switch unit Q2, third switch unit Q3, the 4th switch unit Q4, the 5th open
It closes unit Q5 and its anti-paralleled diode and the 13rd diode D13 and the 14th diode D14 forms three level knot of I type
Structure, and I type three-level structure package module can be used.If not using I type three-level structure package module, the described 13rd
Pole pipe D13 and the 14th diode D14 can be deleted and not had to, this will not influence system performance.
Fig. 3-Fig. 6 is referred to, Fig. 3-Fig. 6 is that the four level topology units of the embodiments of the present invention are realizing direct current friendship
Circulation is when changing, and equivalent circuit diagram when working under 4 kinds of different modalities, Fig. 3 is that four level of the embodiments of the present invention are opened up
Equivalent circuit diagram when flutterring cell operation at first mode H1, Fig. 4 are that the four level topology of the embodiments of the present invention is single
Equivalent circuit diagram when member work is at second mode H2, Fig. 5 are the four level topology unit works of the embodiments of the present invention
Equivalent circuit diagram when making at third mode H3, Fig. 6 are that the four level topology units work of the embodiments of the present invention exists
Equivalent circuit diagram when under the 4th mode H4.
Specifically, when four level topology unit work is at first mode H1, the first switch unit Q1, the
Three switch unit Q3, the 4th switch unit Q4, the 6th switch unit Q6, the 7th switch unit Q7 conducting, other switch units are cut
Only.The DC power anode DC+ is provided by the first diode D1 and the 7th switch unit Q7 to the exchange end AC
Electric current；Or the exchange end AC gives the DC power anode DC by the 7th diode D7 and first switch unit Q1
+ electric current is provided；The DC power anode DC+ passes through the first diode D1, third switch unit Q3 and current limliting electricity simultaneously
Feel L1 to charge to the third capacitor C3；Or the third capacitor C3 by the current-limiting inductance L1, third diode D3 and
First switch unit Q1 provides electric current to DC side.
Specifically, when four level topology unit work is at second mode H2, the second switch unit Q2, the
Four switch unit Q4, the 6th switch unit Q6, the 7th switch unit Q7 conducting, other switch unit cut-offs.It is described commonly connected
The current potential of end M2 is elevated, and the third capacitor C3 is added on the DC power anode DC+ and by the second switch
Unit Q2 and the 7th switch unit Q7 provides electric current to the exchange end AC；Or the exchange end AC passes through the seven or two pole
Pipe D7 and the second diode D2 provides electric current to the DC power anode DC+ and third capacitor C3.
Specifically, when four level topology unit work is at third mode H3, the first switch unit Q1, the
Three switch unit Q3, the 4th switch unit Q4, the 6th switch unit Q6, the 8th switch unit Q8 conducting, other switch units are cut
Only.The exchange end AC is provided by the 6th diode D6 and the 8th switch unit Q8 to the DC power cathode DC-
Electric current；Or the DC power cathode DC- gives the exchange end by the 8th diode D8 and the 6th switch unit Q6
AC provides electric current；The DC power cathode DC- passes through the 6th diode D6, the 4th switch unit Q4 and current limliting electricity simultaneously
Feel L1 to charge to the 4th capacitor C4；Or the 4th capacitor C4 by the current-limiting inductance L1, the 4th diode D4 and
6th switch unit Q6 provides electric current to DC side.
Specifically, when four level topology unit work is at the 4th mode H4, the first switch unit Q1, the
Three switch unit Q3, the 5th switch unit Q5, the 8th switch unit Q8 conducting, other switch unit cut-offs.It is described commonly connected
The current potential of end M3 is pulled low, and the voltage reversal at the 4th both ends capacitor C4 is superimposed upon on the DC power cathode DC-, the exchange
End AC is mentioned by the 8th switch unit Q8 and the 5th switch unit Q5 to the DC power cathode DC- and the 4th capacitor C4
For electric current；Or the DC power cathode DC- and the 4th capacitor C4 passes through the 5th diode D5 and the 8th diode D8
Electric current is provided to the exchange end AC.
By the switching of above-mentioned four kinds of mode, the friendship that the four level topology unit may be implemented under different operating power is straight
Circulation is changed, while each operation mode does not need all switch units and works at the same time, and is reduced loss, is improved efficiency.
First switch unit Q1, second switch unit Q2, the third switch unit Q3, the 4th of the four level topology unit
The driving of switch unit Q4, the 5th switch unit Q5, the 6th switch unit Q6, the 7th switch unit Q7 and the 8th switch unit Q8
Signal is determined by comparing modulating wave sinusoidal signal C and first carrier signal A or the second carrier signal B.Refer to figure
7, Fig. 7 be modulating wave sinusoidal signal C, first carrier signal A, second in the four level topology units of the embodiments of the present invention
Carrier signal B, first switch unit Q1, second switch unit Q2, third switch unit Q3, the 4th switch unit Q4, the 5th open
Close unit Q5, the 6th switch unit Q6, the 7th switch unit Q7, the 8th switch unit Q8 and the timing diagram for exchanging end AC waveform.
Specifically, the driving signal of the first switch unit Q1 is carried by the modulating wave sinusoidal signal C and described first
Wave signal A is compared generation, the first switch when the modulating wave sinusoidal signal C is less than the first carrier signal A
Unit Q1 conducting, otherwise cut-off；
The driving signal of the second switch unit Q2 is by the modulating wave sinusoidal signal C and the first carrier signal A
It is compared generation, the second switch unit Q2 is led when the modulating wave sinusoidal signal C is greater than the first carrier signal A
It is logical, on the contrary cut-off；
The driving signal of the third switch unit Q3 is by the modulating wave sinusoidal signal C and the first carrier signal A
It is compared generation, the third switch unit Q3 is led when the modulating wave sinusoidal signal C is less than the first carrier signal A
It is logical, on the contrary cut-off；
The driving signal of the 4th switch unit Q4 is carried by the backward-wave of the modulating wave sinusoidal signal C and described first
Wave signal A is compared generation, when the backward-wave of the modulating wave sinusoidal signal C be less than the first carrier signal A when described in
4th switch unit Q4 conducting, otherwise cut-off；
The driving signal of the 5th switch unit Q5 is carried by the backward-wave of the modulating wave sinusoidal signal C and described first
Wave signal A is compared generation, when the backward-wave of the modulating wave sinusoidal signal C be greater than the first carrier signal A when described in
5th switch unit Q5 conducting, otherwise cut-off；
The driving signal of the 6th switch unit Q6 is carried by the backward-wave of the modulating wave sinusoidal signal C and described first
Wave signal A is compared generation, when the backward-wave of the modulating wave sinusoidal signal C be less than the first carrier signal A when described in
6th switch unit Q6 conducting, otherwise cut-off；
The driving signal of the 7th switch unit Q7 is by the modulating wave sinusoidal signal C and the second carrier signal B
Be compared generation, when the modulating wave sinusoidal signal C be greater than the second carrier signal B when described in the 7th switch unit Q7 lead
It is logical, on the contrary cut-off；
The driving signal of the 8th switch unit Q8 is by the modulating wave sinusoidal signal C and the second carrier signal B
Be compared generation, when the modulating wave sinusoidal signal C be less than the second carrier signal B when described in the 8th switch unit Q8 lead
It is logical, on the contrary cut-off.
In the present embodiment, the first carrier signal A and the second carrier signal B amplitude having the same and frequency
Rate.In other embodiments, the first carrier signal A and the second carrier signal B can have different amplitude and frequency
Rate.
It is exchanged described in Fig. 7 and is labelled with the four level topology unit work on the waveform timing chart of end AC in four work
Corresponding timing when under mode.
The invention also discloses a kind of application circuit of four level topology units, the four level topology unit is answered
It include above-mentioned four level topology unit with circuit.
Fig. 8 is referred to, Fig. 8 is the functional unit interface signal of the four level topology units of the embodiments of the present invention
Figure.The functional unit interface diagram of four level topology units in Fig. 8 is that above-mentioned four level topology unit removes first capacitor
Functional unit interface diagram after C1 and the second capacitor C2.The functional unit interface of the four level topology unit includes first
Input terminal DC+, the second input terminal M1, third input terminal DC- and output terminals A C.
Fig. 9 is referred to, Fig. 9 is the schematic diagram of the application circuit of the four level topology units of the embodiments of the present invention.
In the present embodiment, the application circuit of the four level topology unit includes that 2 four level topologys shown in Fig. 8 are single
Member, respectively the one or four level topology unit 110 and the two or four level topology unit 120, the four level topology unit are answered
It further include the 5th capacitor Cg, the first inductance La and the second inductance Lb with circuit, in which:
The first of the first capacitor of one or the four level topology unit 110 and the two or the four level topology unit 120
Capacitor is parallel with one another, is equivalent to the first capacitor C1 of the application circuit of the four level topology unit；
The second of second capacitor of the one or the four level topology unit 110 and the two or the four level topology unit 120
Capacitor is parallel with one another, is equivalent to the second capacitor C2 of the application circuit of the four level topology unit；
The first capacitor C1 and the second capacitor C2 are serially connected and are connected between DC power supply positive and negative anodes；
The first input end DC+ of one or the four level topology unit 110 and the two or four level topology unit 120 is and directly
Positive pole is flowed to be connected；
Second input terminal M1 of the one or the four level topology unit 110 and the two or four level topology unit 120 is all connected with
To the common end of the first capacitor C1 and the second capacitor C2；
The third input terminal DC- of one or the four level topology unit 110 and the two or four level topology unit 120 is and directly
Power cathode is flowed to be connected；
The output end of one or the four level topology unit 110 is connected with the first inductance La, the first inductance La
The other end is connected with AC load Vg first end；
The output end of two or the four level topology unit 120 is connected with the second inductance Lb, the second inductance Lb
The other end is connected with AC load Vg second end；
The 5th capacitor Cg is connected in parallel on the both ends the AC load Vg.
In the present embodiment, for generating the modulated sinusoid of 110 driving signal of the one or four level topology unit
Phase and 180 ° of phase phase difference of modulated sinusoid for generating 120 driving signal of the two or four level topology unit.
0, Figure 10 is the signal of the application circuit of four level topology units of another embodiment of the utility model referring to Figure 1
Figure.
In the present embodiment, the application circuit of the four level topology unit includes that 3 four level topologys shown in Fig. 8 are single
Member, respectively the one or four level topology unit 210, the two or four level topology unit 220 and the three or four level topology unit 230,
The application circuit of the four level topology unit further includes the 5th capacitor Ca, the 6th capacitor Cb, the 7th capacitor Cc, the first inductance
La, the second inductance Lb and third inductance Lc, in which:
The first capacitor of one or the four level topology unit 210, the first capacitor of the two or four level topology unit 220 and
The first capacitor of three or four level topology unit 230 is parallel with one another, is equivalent to the application circuit of the four level topology unit
First capacitor C1；
Second capacitor of the one or the four level topology unit 210, the second capacitor of the two or four level topology unit 220 and
Second capacitor of the three or four level topology unit 230 is parallel with one another, is equivalent to the application circuit of the four level topology unit
Second capacitor C2；
The first capacitor C1 and the second capacitor C2 are serially connected and are connected between DC power supply positive and negative anodes；
One or the four level topology unit 210, the two or four level topology unit 220 and the three or four level topology unit
230 first input end DC+ is connected with DC power anode；
One or the four level topology unit 210, the two or four level topology unit 220 and the three or four level topology unit
230 the second input terminal M1 is all connected to the common end of the first capacitor C1 and the second capacitor C2；
One or the four level topology unit 210, the two or four level topology unit 220 and the three or four level topology unit
230 third input terminal DC- is connected with DC power cathode；
The output end of one or the four level topology unit 210 is connected with the first inductance La, the first inductance La
The other end is connected with the first AC load VGa first end；
The output end of two or the four level topology unit 220 is connected with the second inductance Lb, the second inductance Lb
The other end is connected with the second AC load VGb first end；
The output end of three or the four level topology unit 230 is connected with the third inductance Lc, the third inductance Lc
The other end is connected with third AC load VGc first end；
The first AC load VGa second end, the second AC load VGb second end and third AC load VGc second
End is connected to same tie point；
The 5th capacitor Ca first end is connected between the first inductance La and the first AC load VGa；
The 6th capacitor Cb first end is connected between the second inductance Lb and the second AC load VGb；
The 7th capacitor Cc first end is connected between the third inductance Lc and the third AC load VGc；
The 5th capacitor Ca second end, the 6th capacitor Cb second end and the 7th capacitor Cc second end are connected to same connection
Point.
In the present embodiment, for generating the modulated sinusoid of 210 driving signal of the one or four level topology unit
120 ° of phase phase difference of phase and the modulated sinusoid for generating the two or the four level inverse conversion topology unit driving signal are used
In the phase for the modulated sinusoid for generating the two or the four level inverse conversion topology unit driving signal and for generating the third
120 ° of phase phase difference of the modulated sinusoid of four level inverse conversion topology unit driving signals, it is inverse for generating the three or four level
The phase of the modulated sinusoid of variable topological unit drive signals and for generating the one or four level inverse conversion topology unit driving
120 ° of the phase phase difference of the modulated sinusoid of signal.
1, Figure 11 is the signal of the application circuit of four level topology units of another embodiment of the utility model referring to Figure 1
Figure.
In the present embodiment, the 5th capacitor Ca second end, the 6th capacitor Cb second end and the 7th capacitor Cc second end
It is connected to same tie point and is connected with the DC power supply midpoint M1.The application electricity of four level topology units in the present embodiment
Road rest part is identical as embodiment illustrated in fig. 10, repeats no more.
2, Figure 12 is the signal of the application circuit of four level topology units of another embodiment of the utility model referring to Figure 1
Figure.
In the present embodiment, the 5th capacitor Ca second end, the 6th capacitor Cb second end and the 7th capacitor Cc second end
It is connected to same tie point and is connected with the DC power supply midpoint M1, the 5th capacitor Ca second end, the 6th capacitor Cb
Two ends and the 7th capacitor Cc second end are connected to same tie point and exchange with the first AC load VGa second end, second
Supported V Gb second end is connected with the points of common connection of third AC load VGc second end.Four level topology in the present embodiment is single
The application circuit rest part of member is identical as embodiment illustrated in fig. 11, repeats no more.
Above-mentioned four level topology unit and its application circuit can provide higher alternating current in the case where keeping low-loss situation
Pressure can effectively reduce the exchange side cost and loss of AC/DC convertor, and Simultaneous Switching pipe is unified to be encapsulated, and reliability is higher.
And reduces and do encapsulation bring cost pressure again, improve product reliability and versatility, while there is lesser electric current
Circulating path and lower switching tube stress.When the utility model is applied in the systems such as photovoltaic power generation in identical PV voltage etc.
Since it is able to satisfy more high alternating voltage under grade, the grid-connected transformer in exchange side can be further reduced and exchange the cost and damage of cable
Consumption.In addition the utility model can solve to need to prevent using measure and biggish absorbing circuit is pressed in traditional four Level Technologies
Striding capacitance and partial switch pipe and diode both ends overvoltage increase so as to cause the bulky of complete machine, increased costs, loss
Greatly, the problems such as efficiency reduces.The three-level structure package module of existing maturation can be used in the utility model simultaneously, solves biography
Four level of uniting are unified encapsulate and need to encapsulate again caused by the problems such as reliability is low, at high cost, poor universality.Into one
Step ground, the first switch unit Q1, second switch unit Q2, third switch unit Q3, the 4th switch unit Q4, the 5th switch
Unit Q5, the 6th switch unit Q6, the 7th switch unit Q7, the 8th switch unit Q8 dynamic electric voltage stress be only busbar voltage
Half, higher alternating voltage can be met using the switch unit of more low-voltage-grade by having the advantage that, make power device
Part cost reduces, simultaneously because first switch unit Q1, the 6th switch unit Q6 do not have a switching loss, second switch unit Q2,
Third switch unit Q3, the 4th switch unit Q4, the 5th switch unit Q5 stress are small, simultaneously because under equal-wattage grade its
Alternating voltage is higher, so its electric current is also smaller, therefore switching tube loss is smaller, absorbs and cooling system demand is small, so that being
It unites at low cost, reliability improves, and efficiency improves.The utility model is also able to satisfy higher exchange side voltage, especially for mesh
Preceding photovoltaic market and energy storage market, exchange side requires to be connected on the medium voltage network of 10KVac or 35KVac, in phase
With under DC voltage level and equal-wattage grade, the utility model can reduce the exchange grid-connected transformer in side with exchange cable at
Originally it and is lost, so that the cost and lifting system efficiency of whole system are reduced, because exchange side voltage is higher, under equal-wattage
Alternating current is smaller, then exchange side line footpath can it is smaller, while the turn ratio of transformer is also smaller.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of four level topology units, the four level topology unit are connected between the anode of DC power supply and cathode,
It is characterized in that, the four level topology unit includes: first switch unit, second switch unit, third switch unit, the 4th opens
It closes unit, the 5th switch unit, the 6th switch unit, the 7th switch unit, the 8th switch unit, be connected anti-parallel to each switch list
Diode, first capacitor, the second capacitor, third capacitor, the 4th capacitor and the current-limiting inductance at first both ends, in which:
The first switch unit second end is connected with the DC power anode, first end and the 7th switch unit first
End is connected；
The 7th switch unit second end is connected with the 8th switch unit first end, and tie point is the four level topology
The exchange end of unit；
The 8th switch unit second end is connected with the 6th switch unit second end；
The 6th switch unit first end is connected with the DC power cathode；
The second switch unit, third switch unit, the 4th switch unit and the 5th switch unit is sequentially connected in series and one end
It links together with the second end of the first switch unit and the DC power anode, the other end and the 6th switch are single
The first end and the DC power cathode of member link together；
The first capacitor and the second capacitor are sequentially connected in series and one end is connected to the DC power anode, and the other end is connected to institute
It states between DC power cathode；
Third capacitor one end is connected to the common end of the second switch unit and third switch unit, and the other end is connected to
The common end of the first switch unit and the 7th switch unit；
Described 4th capacitor one end is connected to the common end of the 4th switch unit and the 5th switch unit, and the other end is connected to
The common end of 6th switch unit and the 8th switch unit；
Described current-limiting inductance one end is connected to the common end of the third switch unit and the 4th switch unit, and the other end is connected to
The common end of the first capacitor and the second capacitor.
2. four level topology unit according to claim 1, which is characterized in that the four level topology unit is deposited when working
In four kinds of operation modes, the AC DC conversion under different operating power is realized.
3. four level topology unit according to claim 2, which is characterized in that four level topology unit work is the
When under one mode, the first switch unit, third switch unit, the 4th switch unit, the 6th switch unit, the 7th switch are single
Member conducting, other switch unit cut-offs.
4. four level topology unit according to claim 2, which is characterized in that four level topology unit work is the
When under two mode, the second switch unit, the 4th switch unit, the 6th switch unit, the 7th switching means conductive, Qi Takai
Close unit cut-off.
5. four level topology unit according to claim 2, which is characterized in that four level topology unit work is the
When under three mode, the first switch unit, third switch unit, the 4th switch unit, the 6th switch unit, the 8th switch are single
Member conducting, other switch unit cut-offs.
6. four level topology unit according to claim 2, which is characterized in that four level topology unit work is the
When under four mode, the first switch unit, third switch unit, the 5th switch unit, the 8th switching means conductive, Qi Takai
Close unit cut-off.
7. a kind of application circuit of four level topology units, which is characterized in that including 2 four electricity as described in claim 1-6
Flat topology unit, respectively the one or four level topology unit and the two or four level topology unit, the four level topology unit
Application circuit further includes the first inductance and the second inductance, in which:
The first capacitor of the first capacitor of one or the four level topology unit and the two or the four level topology unit is mutually simultaneously
Connection；
Second capacitor of the one or the four level topology unit and the second capacitor of the two or the four level topology unit are mutually simultaneously
Connection；
The first input end of one or the four level topology unit and the two or four level topology unit with DC power anode phase
Even；
Second input terminal of the one or the four level topology unit and the two or four level topology unit is all connected to first electricity
Hold the common end with the second capacitor；
The third input terminal of one or the four level topology unit and the two or four level topology unit with DC power cathode phase
Even；
The output end of one or the four level topology unit is connected with first inductance, the first inductance other end with exchange
First end is loaded to be connected；
The output end of two or the four level topology unit is connected with second inductance, the second inductance other end with exchange
Second end is loaded to be connected.
8. the application circuit of four level topology unit according to claim 7, which is characterized in that the four level topology is single
The application circuit of member further includes the 5th capacitor, and the 5th capacitor is connected in parallel on the AC load both ends.
9. a kind of application circuit of four level topology units, which is characterized in that including 3 four electricity as described in claim 1-6
Flat topology unit, respectively the one or four level topology unit, the two or four level topology unit and the three or four level topology unit, institute
The application circuit for stating four level topology units further includes the first inductance, the second inductance and third inductance, in which:
First capacitor, the first capacitor and the three or four level of the two or four level topology unit of one or the four level topology unit
The first capacitor of topology unit is parallel with one another；
The second capacitor and the three or four level of second capacitor of the one or the four level topology unit, the two or four level topology unit
Second capacitor of topology unit is parallel with one another；
The first input end of one or the four level topology unit, the two or four level topology unit and the three or four level topology unit
It is connected with DC power anode；
Second input terminal of the one or the four level topology unit, the two or four level topology unit and the three or four level topology unit
It is all connected to the common end of the first capacitor and the second capacitor；
The third input terminal of one or the four level topology unit, the two or four level topology unit and the three or four level topology unit
It is connected with DC power cathode；
The output end of one or the four level topology unit is connected with first inductance, the first inductance other end and first
AC load first end is connected；
The output end of two or the four level topology unit is connected with second inductance, the second inductance other end and second
AC load first end is connected；
The output end of three or the four level topology unit is connected with the third inductance, the third inductance other end and third
AC load first end is connected；
The first AC load second end, the second AC load second end and third AC load second end are connected to same company
Contact.
10. the application circuit of four level topology unit according to claim 9, which is characterized in that the four level topology
The application circuit of unit further includes the 5th capacitor, the 6th capacitor and the 7th capacitor, in which:
The 5th capacitor first end is connected between first inductance and first AC load；
The 6th capacitor first end is connected between second inductance and second AC load；
The 7th capacitor first end is connected between the third inductance and the third AC load；
The 5th capacitor second end, the 6th capacitor second end and the 7th capacitor second end are connected to same tie point.
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| CN108377106B (en) * | 2018-05-11 | 2023-12-05 | 易事特集团股份有限公司 | Four-level topological unit and application circuit thereof |
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