CN208849672U - Single-input double-output three-switch-group DC-DC converter - Google Patents

Single-input double-output three-switch-group DC-DC converter Download PDF

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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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switch
group
port
load
connect
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丘东元
张波
林满豪
傅闯
李立浧
饶宏
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China South Power Grid International Co ltd
South China University of Technology SCUT
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China South Power Grid International Co ltd
South China University of Technology SCUT
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Abstract

The utility model provides a single input dual output three switch block DC-DC converter. The converter comprises a direct current input power supply, a first direct current load, a second direct current load and a switch bridge arm; the switch bridge arm is formed by connecting a first switch group, a second switch group, a third switch group and a coupling inductor in series, and each switch group is formed by connecting N power switch units in series. The utility model discloses the circuit has three port, constitutes three kinds of connected modes with DC power supply, two way DC loads all the way, under the different connected condition, can realize respectively step up, step down, rise and fall to press the function. The utility model discloses a carrier wave phase-shifting PWM control controls switching on, turn-off of switch tube in the power switch unit and controls, realizes load voltage's regulation. The utility model discloses be fit for the high-power direct current application of high pressure of single input dual output.

Description

Three switching group DC-DC converter of single-input double-output
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.
CN201821191963.4U 2018-07-25 2018-07-25 Single-input double-output three-switch-group DC-DC converter Active CN208849672U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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