CN108923651A - Three switching group DC-DC converter of single-input double-output and its control method - Google Patents
Three switching group DC-DC converter of single-input double-output and its control method Download PDFInfo
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- CN108923651A CN108923651A CN201810827749.1A CN201810827749A CN108923651A CN 108923651 A CN108923651 A CN 108923651A CN 201810827749 A CN201810827749 A CN 201810827749A CN 108923651 A CN108923651 A CN 108923651A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/082—Plural DC voltage, e.g. DC supply voltage with at least two different DC voltage levels
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides three switching group DC-DC converter of single-input double-output and its control method.Converter includes direct-current input power supplying, the first DC load, the second DC load, switch bridge arm；The switch bridge arm is connected in series by first switch group, second switch group, third switching group, coupling inductance, and each switching group is connected in series by N number of power switch unit.There are three ports for circuit tool of the present invention, can realize boosting, decompression, stepping functions respectively under different connections with DC power supply all the way, two-way DC load three kinds of connection types of composition.The present invention is controlled using phase-shifting carrier wave PWM, is controlled the on, off of switching tube in power switch unit, is realized the adjusting of load voltage.The present invention is suitble to the high-power DC application occasion of single-input double-output.
Description
Technical field
The present invention relates to distributed generation systems and direct current transportation field, and in particular to a kind of switch of single-input double-output three
Group DC-DC converter and its control method.
Background technique
As the effective means for solving the problems, such as new-energy grid-connected, flexible multi-terminal HVDC transmission and DC grid are rapidly developed.
But current many DC grids operate in different voltage class, need to be attached by inverter.Currently used for connecting not
Main method with DC grid has：DC grid is interconnected two-by-two by commutator transformer, is become by multiport DC-DC
Multiple DC grids are interconnected and are interconnected multiple DC grids from coupling transformer using multiport DC-DC by parallel operation.?
When realizing the connection of multiple DC grids, first two method not only needs multiple converters but also voltage is by DC-AC and AC-DC two
Grade transformation, at high cost, loss is big；The third method needs multiple converter series connection, and serious forgiveness is low, at high cost.Therefore, research is single
One high-voltage high-power DC-DC conversion utensil is significant.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of three switching group of single-input double-output is proposed
DC-DC converter and its control method.
The purpose of the present invention is realized at least through following technical solution.
Three switching group DC-DC converter of single-input double-output, including direct-current input power supplying, bridge arm, the first DC load and
Second DC load；The bridge arm is connected in series by first switch group, second switch group, third switching group, coupling inductance；First
Switching group, second switch group, third switching group are connected in series by N number of power switch unit, and N is positive integer.First switch group
Upper end a and grounding point n constitute converter first port T1, non-same polarity and the second switch group upper end of coupling inductance primary side
Tie point c and grounding point n structure are converter second port T2, the lower end of second switch group and the company of coupling inductance pair side Same Name of Ends
Contact d and grounding point n constitutes converter third port T3, grounding point n of the lower end of third switching group as converter.
Further, the voltage U of the first port of three switching group DC-DC converter of single-input double-output1, second port
Voltage U2, third port voltage U3Meet：U1>U2>U3。
Further, direct-current input power supplying, the first DC load, the second DC load and first port, second port,
There are three types of different connection types for three ports.First way：First port connects the anode of direct-current input power supplying, direct current input electricity
The cathode in source is connected to ground, and second port connects one end of the first DC load, and the other end of the first DC load is connected to ground,
Third port connects one end of the second DC load, and the other end of the second DC load is connected to ground, and realizes buck functionality；Second
Kind mode：First port T1One end of the first DC load is connected, the other end of the first DC load is connected to ground, second port
T2One end of the second DC load is connected, the other end of the second DC load is connected to ground, third port T3Connect direct current input electricity
The cathode of the anode in source, direct-current input power supplying is connected to ground, and realizes boost function；The third mode：First port T1Connection the
The other end of one end of one DC load, the first DC load is connected to ground, second port T2Connect direct-current input power supplying just
The cathode of pole, direct-current input power supplying is connected to ground, third port T3One end of the second DC load is connected, the second DC load
The other end is connected to ground, while realizing stepping functions.
Further, the independence that the coupling inductance in bridge arm can be equal by upper bridge arm inductance and lower bridge arm inductance two values
Inductance substitution.
Further, power switch unit includes first switch tube, second switch, first diode, the second diode
And capacitor；Wherein, the anode of capacitor is connect with the cathode of the collector of second switch, the second diode, second switch
Emitter is connect with the cathode of the anode of the second diode, the collector of first switch tube, first diode, first switch tube
The cathode of emitter and the anode of first diode, capacitor connects；The collector of first switch tube is as the first output end, and first
The emitter of switching tube is as second output terminal.
Further, the second output terminal of i-th of power switch unit of each switching group and i+1 power switch list
The first output end connection of member, wherein i value is 1~N-1.
The control method of above-mentioned converter is:Using phase-shifting carrier wave PWM control the switching tube of each switching group open with
Shutdown；I-th of power switch unit of first switch group (A1) and i-th of power switch unit of third switching group are using identical
Triangular wave is as i-th of carrier wave uCi, wherein i value is 1~N；N number of carrier wave successively 360 °/N of lagging phase angle；First switch group is defeated
Voltage, third switching group output voltage are all made of direct current wave as modulating wave out.
Further, in above-mentioned control method, the first modulating wave uRef1With i-th of carrier wave uCiIt is obtained by first comparator
The control level of the first switch tube gate pole of i-th of power switch unit of first switch group, as the first modulating wave uRef1It is greater than
I-th of carrier wave uCiWhen, first comparator exports high level, as the first modulating wave uRef1Less than i-th carrier wave uCiWhen, first compares
Device exports low level, and wherein the value of i is 1~N；Second modulating wave uRef2With i-th of carrier wave uCiIt is obtained by the second comparator
The control level of the first switch tube gate pole of i-th of power switch unit of third switching group, as the second modulating wave uRef2It is less than
I-th of carrier wave uCiWhen, the second comparator exports high level, as the second modulating wave uRef2Greater than i-th carrier wave uCiWhen, second compares
Device exports low level；The control level and third of the first switch tube gate pole of i-th of power switch unit of first switch group are opened
The control level of the first switch tube gate pole of i-th of power switch unit of pass group obtains the of second switch group by XOR gate
The control level of first switch tube gate pole in i power switch unit；First in each power switch unit of each switching group
The control level of the second switch gate pole of the power switch unit is obtained after the control level inversion of switching tube gate pole.
Compared with prior art, the invention has the advantages that and technical effect：Three switching group DC-DC of single-input double-output
Converter has the advantages that MMC, by changing the number of modules N in switching group, any output voltage may be implemented, be suitble to height
It presses, the application of large-power occasions, capacitance voltage is U in each power unit module1/N；It is opened up with existing DC-DC conversion circuit
It flutters and compares, DC-DC converter proposed by the present invention can realize two-way direct current output in the case where an input DC power,
Significantly reduce engineering cost；It is single by the selection transducer port connection type different between DC power supply, DC load
Input three switching group DC-DC converter of dual output is able to achieve the function of boosting, decompression while buck.
Detailed description of the invention
Fig. 1 is the circuit structure diagram under three switching group DC-DC converter the first connection type of single-input double-output；
Fig. 2 is the power cell circuit structure diagram of the switching group DC-DC converter of single-input double-output three shown in Fig. 1；
Fig. 3 is the phase-shifting carrier wave PWM control method of three switching group DC-DC converter of single-input double-output shown in FIG. 1
Structure chart；
Fig. 4 is the tune of the used phase-shifting carrier wave PWM control method of three switching group DC-DC converter of this example single-input double-output
Wave and carrier waveform processed.
Fig. 5 is the simulation waveform of three switching group DC-DC converter of single-input double-output.
Specific embodiment
For the content and feature that the present invention is further explained, specific embodiments of the present invention are carried out below in conjunction with attached drawing
It illustrates, but implementation of the invention is without being limited thereto.If it is noted that having the process or symbol of not special detailed description below
Number, it is that those skilled in the art can refer to prior art understanding or realize.
By taking the first connection type as an example.
With reference to Fig. 1, the single-phase three switching groups DC-DC of the dual output of the present embodiment becomes device, including direct-current input power supplying Udc, switch
Bridge arm, the first DC load R1, the second DC load R2；The switch bridge arm is by first switch group A1, coupling inductance Lp：Ls,
Two switching group A2, third switching group A3 are connected in series；First switch group A1 is by N number of power cell SMA11、SMA12、…、SMA1NString
Connection composition, second switch group A2 is by N number of power cell SMA21、SMA22、…、SMA2NIt is composed in series, third switching group A3 is by N number of function
Rate cell S MA31、SMA32、…、SMA3NIt is composed in series.The lower end of first switch group A1 and coupling inductance Lp：LsPrimary side LpIt is of the same name
Hold b connection, coupling inductance Lp：LsPrimary side LpNon-same polarity c connect with the upper end of second switch group A2, second switch group A2's
Lower end and coupling inductance Lp：LsSecondary side LsSame Name of Ends d connection, coupling inductance Lp：LsSecondary side LsNon-same polarity e and third switch
The upper end connection of group A3, the lower end of third switching group A3 is connect with ground terminal n.First port T under the first connection type1With direct current
Input power UdcAnode connection, direct-current input power supplying UdcCathode with ground n connect, second port T2With the first load R1One
End connection, the first load R1The other end with ground n connect, third port T3With the second load R2One end connection, second load R2
The other end with ground n connect.As shown in Figure 1, i-th of power switch unit SM of first switch group A1A1iSecond output terminal with
The i+1 power switch unit SM of first switch group A1A1(i+1)The first output end connection, wherein i value be 1~N-1；The
I-th of power switch unit SM of two switching group A2A2iSecond output terminal and second switch group A2 i+1 power switch
Cell S MA2(i+1)The first output end connection；I-th of power switch unit SM of third switching group A3A3iSecond output terminal with
The i+1 power switch unit SM of third switching group A3A3(i+1)The first output end connection.Power module uses in switching group
Half-bridge submodule shown in Fig. 2.
As shown in Figure 1, direct current power source voltage Udc, first load both end voltage U2With the second load both end voltage U3For：
It can be obtained in conjunction with 1
According to phase-shifting carrier wave modulation strategy, selection two-way modulating wave is：
N=4 in this example, Udc=240V, therefore Uc=240V/4=60V.In order to obtain two-way output U2=120V, U3=
80V calculates to obtain modulating wave u by formula 3ref1=0, uref1=-1/3.The waveform of gained modulating wave and carrier wave is as shown in Figure 4.
I-th of power switch unit SM of first switch group A1A1iWith i-th of power switch unit of third switching group A3
SMA3i, using identical triangular wave as carrier wave uCi, wherein the value of i is 1~4；4 carrier wave (uCl、uC2、uC3、uC4) successively stagnant
90 ° of phase angle afterwards；The modulating wave u of first switch group outputRef1=0, the modulating wave of third switching group outputFirst adjusts
Wave u processedRef1Respectively with 4 carrier wave (uCl、uC2、uC3、uC4) compare, obtain 4 power switch units of first switch group A1
(SMA11、SMA12、SMA13、SMA14) in first switch tube S1Control level (the u of gate polegA11、ugA12、ugA13、ugA14), when the first tune
Wave u processedRef1Greater than carrier wave uCiWhen, obtained control level ugA1iFor high level, as the first modulating wave uRef1Less than carrier wave uCiWhen,
Obtained control level ugA1iFor low level, wherein the value of i is 1~4；Second modulating wave uRef2Respectively with 4 carrier wave (uCl、
uC2、uC3、uC4) compare, obtain 4 power switch unit (SM of third switching group A3A31、SMA32、SMA33、SMA34) in first open
Close pipe S1Control level (the u of gate polegA11、ugA12、ugA13、ugA14), as the second modulating wave uRef2Greater than carrier wave uCiWhen, obtained control
Level u processedgA3iFor low level, as the second modulating wave uRef2Less than carrier wave uCiWhen, obtained control level ugA3iFor high level；The
I-th of power switch unit SM of one switching group A1A1iMiddle first switch tube S1The control level u of gate polegA1iWith third switching group
I-th of power switch unit SM of A3A3iMiddle first switch tube S1The control level u of gate polegA3iSecond is calculated by exclusive or
I-th of power switch unit SM of switching group A2A2iMiddle first switch tube S1The control level u of gate polegA2i；Each switching group
Each power switch unit in first switch tube S1It is obtained second in the power switch unit after the control level inversion of gate pole
Switching tube S2The control level of gate pole.To respectively obtain the output voltage u of first switch group A1A1, second switch group A2 it is defeated
Voltage u outA2And the output voltage u of third switching group A3A2, and then obtain first via output voltage U2With the second road output voltage
U3。
Fig. 5 is N=4, UdcWhen=240V, the simulation waveform of three switching group DC-DC converter of single-input double-output, from upper
It is successively the first modulating wave u underRef1With the second modulating wave uRef2, DC input voitage UdcWith first switch group output voltage
uA1, the first load voltage U2With the voltage u of second switch groupA2, the second load voltage U3With the voltage u of third switching groupA3(U3With
uA3Waveform is overlapped).From waveform diagram as it can be seen that U2Equal to target DC output voltage 120V, U3Although being pulsating direct current, it is average
Value is target DC voltage 80V.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. three switching group DC-DC converter of single-input double-output, it is characterised in that：Including a direct-current input power supplying (Udc), open
Close bridge arm, the first DC load (R1), the second DC load (R2)；The switch bridge arm is by first switch group (A1), coupling inductance
(Lp：Ls), second switch group (A2), third switching group (A3) be connected in series；The upper end a of first switch group (A1) constitutes converter
First port (T1), coupling inductance primary side (Lp) non-same polarity and second switch group (A2) upper end tie point c constitute convert
Device second port (T2), the lower end of second switch group (A2) and coupling inductance pair side (Ls) Same Name of Ends tie point d constitute transformation
Device third port (T3), the lower end of third switching group (A3) is connected with grounding point n.
2. three switching group DC-DC converter of single-input double-output according to claim 1, it is characterised in that：First switch
Group (A1) is by N number of power cell (SMA11、SMA12、…、SMA1N) be composed in series, second switch group (A2) is by N number of power cell
(SMA21、SMA22、…、SMA2N) be composed in series, third switching group (A3) is by N number of power cell (SMA31、SMA32、…、SMA3N) string
Connection composition；Wherein, N is positive integer.
3. three switching group DC-DC converter of single-input double-output according to claim 1, it is characterised in that：First port
(T1) voltage U1, second port (T2) voltage U2, third port (T3) voltage U3Meet U1>U2>U3。
4. three switching group DC-DC converter of single-input double-output according to claim 1, it is characterised in that：Direct current input
Power supply (Udc), the first DC load (R1), the second DC load (R2) and first port (T1), second port (T2), third port
(T3) there are three types of different connection types；Wherein first way is：First port (T1) connection direct-current input power supplying (Udc) just
Pole, direct-current input power supplying (Udc) cathode with ground (n) connect, second port (T2) the first DC load (R of connection1) one end,
First DC load (R1) the other end with ground (n) connect, third port (T3) the second DC load (R of connection2) one end,
Two DC load (R2) the other end with ground (n) connect, realization buck functionality；The second way is：First port T1Connection first
DC load (R1) one end, the first DC load (R1) the other end with ground (n) connect, second port T2Connect the second direct current
Load (R2) one end, the second DC load (R2) the other end with ground (n) connect, third port T3Connect direct-current input power supplying
(Udc) anode, direct-current input power supplying (Udc) cathode with ground (n) connect, realization boost function；The third mode is：First
Port T1Connect the first DC load (R1) one end, the first DC load (R1) the other end with ground (n) connect, second port
T2Connect direct-current input power supplying (Udc) anode, direct-current input power supplying (Udc) cathode with ground (n) connect, third port T3Connection
Second DC load (R2) one end, the second DC load (R2) the other end connect with ground (n), while realizing stepping functions.
5. three switching group DC-DC converter of single-input double-output according to claim 1, it is characterised in that：The coupling
Inductance can be by upper bridge arm inductance (Lp) and lower bridge arm inductance (Ls) the equal separate inductor substitution of two values.
6. three switching group DC-DC converter of single-input double-output according to claim 1, it is characterised in that：First switch
The lower end of group (A1) and coupling inductance primary side (Lp) Same Name of Ends (b) connection, coupling inductance primary side (Lp) non-same polarity and second
The upper end of switching group (A2) connects, tie point c, the lower end of second switch group (A2) and coupling inductance pair side (Ls) Same Name of Ends
Connection, tie point d, coupling inductance pair side (Ls) non-same polarity (e) connect with the upper end of third switching group (A3), third is opened
The lower end of pass group (A3) is connect with ground terminal (n).
7. three switching group DC-DC converter of single-input double-output according to claim 1, it is characterised in that：Power switch
Unit includes first switch tube (S1), second switch (S2), first diode (D1), the second diode (D2) and capacitor (CSM)；
Wherein, capacitor (CSM) anode with second switch (S2) collector, the second diode (D2) cathode connection, second switch
Manage (S2) emitter and the second diode (D2) anode, first switch tube (S1) collector, first diode (D1) yin
Pole connection, first switch tube (S1) emitter and first diode (D1) anode, capacitor (CSM) cathode connection；First opens
Close pipe (S1) collector as the first output end, first switch tube (S1) emitter as second output terminal.
8. three switching group DC-DC converter of single-input double-output according to claim 2, it is characterised in that：First switch
I-th of power switch unit (SM of group (A1)A1i) second output terminal and first switch group (A1) i+1 power switch
Unit (SMA1(i+1)) the first output end connection, wherein i value be 1~(N-1)；I-th of power of second switch group (A2) is opened
Close unit (SMA2i) second output terminal and second switch group (A2) i+1 power switch unit (SMA2(i+1)) first
Output end connection；I-th of power switch unit (SM of third switching group (A3)A3i) second output terminal and third switching group
(A3) i+1 power switch unit (SMA3(i+1)) the first output end connection.
9. being used for the control method of three switching group DC-DC converter of single-input double-output described in claim 1, feature exists
In：Using phase-shifting carrier wave PWM control first switch group (A1), the switching tube of second switch group (A2) and third switching group (A3)
It opens and turns off；I-th of power switch unit (SM of first switch group (A1)A1i) and third switching group (A3) i-th of power
Switch unit (SMA3i) use identical triangular wave as i-th of carrier wave uCi, wherein：I value is 1~N；N number of carrier wave (uC1、
uC2、…、uCN) successively 360 °/N of lagging phase angle；First modulating wave uRef1Using direct current wave, the second modulating wave uRef2Also direct current is used
Wave.
10. control method according to claim 9, it is characterised in that：First modulating wave uRef1With i-th of carrier wave uCiPass through
First comparator obtains i-th of power switch unit (SM of first switch group (A1)A1i) first switch tube (S1) gate pole control
Level (u processedgA1i), as the first modulating wave uRef1Greater than i-th carrier wave uCiWhen, first comparator exports high level, when the first tune
Wave u processedRef1Less than i-th carrier wave uCiWhen, first comparator exports low level, and wherein the value of i is 1~N；Second modulating wave
uRef2With i-th of carrier wave uCiI-th of power switch unit (SM of third switching group (A3) is obtained by the second comparatorA3i)
First switch tube (S1) gate pole control level (ugA3i), as the second modulating wave uRef2Less than i-th carrier wave uCiWhen, second compares
Device exports high level, as the second modulating wave uRef2Greater than i-th carrier wave uCiWhen, the second comparator exports low level；First switch
I-th of power switch unit (SM of group (A1)A1i) first switch tube (S1) gate pole control level (ugA1i) and third switch
I-th of power switch unit (SM of group (A3)A3i) first switch tube (S1) gate pole control level (ugA3i) pass through XOR gate
Obtain i-th of power switch unit (SM of second switch group (A2)A2i) in first switch tube (S1) gate pole control level
(ugA2i)；First switch tube (S in each power switch unit of each switching group1) gate pole control level inversion after be somebody's turn to do
Second switch (the S of power switch unit2) gate pole control level.
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