CN208849672U - Single-input double-output three-switch-group DC-DC converter - Google Patents
Single-input double-output three-switch-group DC-DC converter Download PDFInfo
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- CN208849672U CN208849672U CN201821191963.4U CN201821191963U CN208849672U CN 208849672 U CN208849672 U CN 208849672U CN 201821191963 U CN201821191963 U CN 201821191963U CN 208849672 U CN208849672 U CN 208849672U
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Abstract
本实用新型提供单输入双输出三开关组DC‑DC变换器。变换器包括直流输入电源、第一直流负载、第二直流负载、开关桥臂；所述开关桥臂由第一开关组、第二开关组、第三开关组、耦合电感串联而成，每个开关组均由N个功率开关单元串联而成。本实用新型电路具有三个端口，与一路直流电源、两路直流负载构成三种连接方式，在不同连接情况下，可分别实现升压、降压、升降压功能。本实用新型采用载波移相PWM控制，对功率开关单元中开关管的导通、关断进行控制，实现负载电压的调节。本实用新型适合单输入双输出的高压大功率直流应用场合。
The utility model provides a single-input double-output three-switch group DC-DC converter. The converter includes a DC input power supply, a first DC load, a second DC load, and a switch bridge arm; the switch bridge arm is formed by a first switch group, a second switch group, a third switch group, and a coupling inductor connected in series, each Each switch group is formed by connecting N power switch units in series. The circuit of the utility model has three ports, and forms three connection modes with one DC power supply and two DC loads. Under different connection conditions, the functions of boosting, decreasing, and boosting and boosting can be realized respectively. The utility model adopts the carrier phase-shift PWM control to control the turn-on and turn-off of the switch tube in the power switch unit, so as to realize the regulation of the load voltage. The utility model is suitable for high-voltage and high-power direct current application occasions with single input and double output.
Description
Technical field
The utility model relates to distributed generation systems and direct current transportation field, and in particular to a kind of single-input double-output three
Switching group DC-DC converter.
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: interconnecting DC grid 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.
Utility model content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, propose that a kind of single-input double-output three switchs
Group DC-DC converter.
The purpose of this utility model 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 the converter of the utility model is: the switching tube of each switching group is controlled using phase-shifting carrier wave PWM
Open and turn off；I-th of power switch unit of first switch group (A1) and i-th of power switch unit of third switching group
Using identical triangular wave 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
Switching group output voltage, third switching group output voltage are all made of direct current wave as modulating wave.First modulating wave uRef1With i-th
Carrier wave uCiThe control electricity of the first switch tube gate pole of i-th of power switch unit of first switch group is obtained by first comparator
It is flat, as the first modulating wave uRef1Greater than i-th carrier wave uCiWhen, first comparator exports high level, as the first modulating wave uRef1It is small
In i-th of carrier wave uCiWhen, first comparator exports low level, and wherein the value of i is 1~N；Second modulating wave uRef2With i-th
Carrier wave uCiThe control electricity of the first switch tube gate pole of i-th of power switch unit of third switching group is obtained by the second comparator
It is flat, as the second modulating wave uRef2Less than i-th carrier wave uCiWhen, the second comparator exports high level, as the second modulating wave uRef2Greatly
In i-th of carrier wave uCiWhen, the second comparator exports low level；The first switch of i-th of power switch unit of first switch group
The control level of the first switch tube gate pole of i-th of power switch unit of the control level and third switching group of pipe gate pole passes through
XOR gate obtains the control level of first switch tube gate pole in i-th of power switch unit of second switch group；Each switching group
Each power switch unit in first switch tube gate pole control level inversion after obtain the second of the power switch unit and open
Close the control level of pipe gate pole.
Compared with prior art, the utility model has the following advantages that and technical effect: three switching group of single-input double-output
DC-DC converter has the advantages that MMC, by changing the number of modules N in switching group, any output voltage may be implemented, fit
The application of high pressure, large-power occasions is closed, capacitance voltage is U in each power unit module1/N；Electricity is converted with existing DC-DC
Road topology is compared, the utility model proposes DC-DC converter can in the case where an input DC power, realize two-way it is straight
Stream output, significantly reduces engineering cost；Pass through the connection different between DC power supply, DC load of selection transducer port
Mode, three switching group DC-DC converter of single-input double-output are 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
Specific implementation for the content and feature that the utility model is further described, below in conjunction with attached drawing to the utility model
Scheme is specifically described, but the implementation of the utility model is without being limited thereto.If it is noted that there is not especially detailed description below
Process or symbol, be those skilled in the art can refer to the prior art understand 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 A1A1i) second 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；
I-th of power switch unit SM of second switch group A2A2iSecond output terminal and the i+1 power of second switch group A2 open
Close 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 is adopted in switching group
The 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 U3Are as follows:
It can be obtained in conjunction with 1
According to phase-shifting carrier wave modulation strategy, two-way modulating wave is selected are as follows:
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.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by described
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (8)
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 are as follows: 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 are as follows: 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 are as follows: 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108923651A (en) * | 2018-07-25 | 2018-11-30 | 华南理工大学 | Single-input double-output three-switch-group DC-DC converter and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923651A (en) * | 2018-07-25 | 2018-11-30 | 华南理工大学 | Single-input double-output three-switch-group DC-DC converter and control method thereof |
| CN108923651B (en) * | 2018-07-25 | 2021-06-08 | 华南理工大学 | Single-input double-output three-switch group DC-DC converter and control method thereof |
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