CN109412452A - A kind of DC communication power converting circuit - Google Patents

A kind of DC communication power converting circuit Download PDF

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Publication number
CN109412452A
CN109412452A CN201811648929.XA CN201811648929A CN109412452A CN 109412452 A CN109412452 A CN 109412452A CN 201811648929 A CN201811648929 A CN 201811648929A CN 109412452 A CN109412452 A CN 109412452A
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China
Prior art keywords
switching tube
capacitor
switch
inductance
diode
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CN201811648929.XA
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Chinese (zh)
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CN109412452B (en
Inventor
阚加荣
童海生
董小燕
吴云亚
吴冬春
葛玉华
张守国
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Zhongtian Broadband Technology Co Ltd
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Yangcheng Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a kind of DC communication power converting circuits, including input direct-current source, DC converting unit, exchange conversion unit, filter unit, DC converting unit is to export a DC bus-bar voltage according to a DC power supply, and wherein DC bus-bar voltage is higher than the voltage of the DC power supply；Exchange conversion unit is connected to DC converting unit and receives the DC bus-bar voltage, and output DC bus-bar voltage is converted to an alternating voltage and an alternating current；Filter unit is used to filter out the ripple of the alternating current and alternating voltage, to provide the smooth alternating voltage and the alternating current in load.Electric power conversion apparatus of the present invention keeps the voltage stress of switching tube smaller, and fewer than switching tube used in traditional two-stage type scheme, reduces switching tube conduction loss and turn-off power loss, improves the efficiency of entire converter.

Description

A kind of DC communication power converting circuit
Technical field
The present invention relates to the technical fields of transformation of electrical energy, more particularly, to a kind of DC communication power converting circuit.
Background technique
With increasingly paying attention to energy-saving and environment-friendly at present, generation of electricity by new energy is widely used, but due to by external environment etc. The influence of factor, grid-connected power generation system such as solar energy/wind energy etc., output voltage range is wide, while its electromagnetism working environment Badly, the high efficiency with higher boost capability, high reliability DC communication converting means are needed to configure, new energy is exported into electricity Buckling is at the satisfactory alternating voltage of electric voltage frequency.There is bridge arm direct pass in traditional DC-AC conversion circuit because, electricity Reliability is lower under magnetic disturbance environment, and ac output voltage need to be lower than DC input voitage, is not able to satisfy the above job requirement.
Existing solution is that AC transformer or DC converter are added in DC-AC circuit to reach boosting Function, but the bulky heavy and cost of implementation of AC transformer is high, and the two-stage type structure that DC converter is added makes system It realizes complicated and influences efficiency, while their reliabilities are not improved；Existing acyclic type converter such as source of resistance current transformer With boost capability and reliability it is higher, but its need of work that boosts utilizes bridge arm direct pass state, switching tube current stress and leads Logical loss is very big, and system effectiveness is low, and is only applicable to three-phase alternating current output application.
Summary of the invention
Goal of the invention: in order to overcome above-mentioned problem of the prior art, the purpose of the present invention is to provide one kind to have boosting High efficiency, the control method of high reliability DC communication power converting circuit and the DC communication power converting circuit of ability.
Technical solution:
A kind of DC communication power converting circuit, comprising: DC power supply, first capacitor, one second capacitor, the first inductance, Second inductance, first diode, the second diode, third diode, the 4th diode, first switch tube, second switch, Three switching tubes, the 4th switching tube, third inductance and third capacitor, the first end of first inductance and the anode of DC power supply connect It connecing, the second end of first inductance is connect with the anode of the anode of the first diode, the second diode, and the described 2nd 2 The cathode of pole pipe is connect with the first end of second capacitor, the first end of the second inductance, the second end ground connection of the second capacitor, institute State the cathode of the second end connection first diode of the second inductance, the anode of third diode and the 4th diode；Three or two pole Output end, the input terminal of second switch and the first end of third inductance of the cathode connection first switch tube of pipe, the third The second end of inductance is connect with the first end of the third capacitor, the output of the cathode connection third switching tube of the 4th diode It holds, the input terminal of the 4th switching tube, the second end of third capacitor, the third capacitor and a load parallel connection；First switch Pipe input terminal is connect with third switching tube input terminal, and is connected with the anode of first capacitor, the cathode ground connection of first capacitor, and second Switching tube output end, the 4th switching tube output end are connected with DC power cathode, DC power cathode ground connection；The direct current Source, first capacitor, the second capacitor, the first inductance, the second inductance, first diode, the second diode, third diode, the 4th Diode, first switch tube, second switch, third switching tube, the 4th switching tube constitute DC converting unit, and described first opens Guan Guan, second switch, third switching tube, the 4th switching tube constitute exchange conversion unit, the third inductance and third capacitor Constitute filter unit；The DC converting unit is to export a DC bus-bar voltage according to a DC power supply, wherein described straight The voltage that busbar voltage is higher than the DC power supply is flowed, at least one conducting in the second switch and the 4th switching tube When, the DC power supply is to first induction charging, and second capacitor is to second induction charging, first inductance With the second inductive energy storage；And when the second switch and the 4th switching tube are turned off, second capacitor charging, institute It states the first inductance electric energy that will respectively store of connecting with second inductance to convert to the first capacitor, to promote described first The voltage of capacitor, to promote the DC bus-bar voltage；The exchange conversion unit is connected to the DC converting unit and connects By the DC bus-bar voltage, exports DC bus-bar voltage and be converted to an alternating voltage and an alternating current；The filter unit For filtering out the ripple of the alternating current and alternating voltage, with provide the smooth alternating voltage and the alternating current in Load.
Further, first switch tube conducting complementary with the second switch, the third switching tube and described 4th switching tube complementation conducting.
Further, the proportionate relationship of the voltage of the DC bus-bar voltage and the DC power supply are as follows:
Wherein, UnFor the voltage of the DC power supply, UdcFor the DC bus-bar voltage, DdcFor accounting for for DC converting unit Empty ratio.
Further, first switch tube, second switch, third switching tube, the 4th switching tube driving signal relationship such as Under:
Wherein Sd1、Sd2、Sd3、Sd4The respectively described first switch tube, second switch, third switching tube, the 4th switching tube Driving signal, SdcFor one first modulated signal, Sac1For one second modulated signal, Sac2For a third modulated signal.
Further, first modulated signal is that the modulating wave of a constant amplitude and a carrier wave hand over the fixation arteries and veins for cutting and generating Rush signal；Second modulated signal is that one first half-sinusoid modulating wave and a carrier wave hand over the pulse signal for cutting and generating；It is described Third modulated signal is that one second half-sinusoid modulating wave and the carrier wave hand over the pulse signal for cutting and generating, wherein described second just The phase difference of string semi-wave modulated wave and the first half-sinusoid modulating wave is 180 degree.
The utility model has the advantages that
1) device is higher than the DC boosting ability of traditional two-stage type structure, small to inductance value requirement, reduces inductance Copper loss, iron loss, core loss；
2) DC bus-bar voltage is high, smaller to DC bus decoupling capacitance demand；
3) switching tube negligible amounts used in, switching tube stress is small, and converter whole efficiency gets a promotion；
4) pass-through state is not present in switching tube, and system reliability is high.
Detailed description of the invention
Fig. 1 is DC communication power converting circuit circuit diagram.
Fig. 2 is DC communication power converting circuit modulation scheme schematic diagram.
Fig. 3 is that DC communication power converting circuit switching tube driving signal generates schematic diagram.
Fig. 4 is the input of DC communication power converting circuit, output voltage and DC bus side V diagram.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawings and embodiments.
The present invention provides a kind of DC communication power converting circuit, including DC converting unit, exchange conversion unit, filtering Unit obtains higher DC bus-bar voltage by DC converting unit and reduces to the decoupling capacitance requirement of DC bus side, Compared to two-stage type structure, it is not necessarily to transformer, direct current, alternating current unit are in same level-one, obtained direct current few using switching tube quantity Busbar voltage is higher, reduces switching loss, and control is simple, high reliablity and overall efficiency height.
Technical solution of the present invention is described in detail with reference to the accompanying drawing:
As shown in Figure 1, DC communication power converting circuit includes that DC converting unit 1, exchange conversion unit 2 and filtering are single Member 3.Since higher voltage should be obtained at first capacitor both ends, the use of switching tube is reduced to the greatest extent again to improve system effect Rate, so DC converting unit 1 and the meeting common switch pipe of exchange conversion unit 2 are realized without influencing respective function.DC converting Unit 1 includes input DC power Vin, first capacitor C1, the second capacitor C2, the first inductance L1, the second inductance L2And the 1st Pole pipe D1, the second diode D2, third diode D3, the 4th diode D4, first switch tube S1, second switch S2, third Switching tube S3 and the 4th switching tube S4.When first diode D1 conducting, the second diode D2 cut-off, DC power supply Vin, second electricity Hold C2Respectively to the first inductance L1, the second inductance L2Charging；The first switch tube S1 is simultaneously turned on the third switching tube S3 When, D1 ends and D2 is connected, L1、L2It connects to the first capacitor C1It releases energy.Third diode D3, the 4th diode D4, When for second switch S2, the 4th switching tube S4 conducting, make L1、L2Energy storage；When S2, S4 are turned off, it is supplied to first capacitor C1It fills Electric pathway.The DC converting unit is input voltage V as a result,inIt is increased to certain grade, it can be in DC bus side, that is, described first Capacitor C1Both ends obtain higher voltage, the input source of exchange conversion unit is used as with this, with the output voltage phase for exchanging side Matching.Exchange conversion unit 2 includes the first bridge arm, the second bridge arm, and each bridge arm is connected in parallel.Wherein the first bridge arm is opened comprising first Pipe S1 and second switch S2 is closed, the second bridge arm includes third switching tube S3 and the 4th switching tube S4.The exchange conversion unit is used The direct current energy of DC bus side is converted to AC energy output.Filter unit is to exchange conversion unit output voltage, electricity Stream is filtered, third inductance L3As filter inductance, keep output load current smoothened, there is flat wave effect.Third electricity Hold C3For output filter capacitor, smooth output voltage makes to load both ends output voltage waveforms close to sine wave.
Wherein, L1First end and VinAnode connection, L1Second end be connected with D1 anode, D2 anode；L2First end Cathode, the second capacitor C with D22First end connection；L2The connection of the cathode of second end and D1.L2Second end through diode D3, D4 is connected to the first bridge arm midpoint, the second bridge arm midpoint respectively.The output end of S1 respectively with L3First end, S2 input terminal connect It connects；The output end and C of S33Second end, the connection of S4 input terminal.S1 input terminal is connect with S3 input terminal, and and C1Anode be connected, C1Cathode ground connection.S2 output end is connect with S4 output end, and and VinCathode is connected, VinCathode ground connection；Load both ends and C3The One end, second end are respectively connected with.
Compared to traditional two-stage type structure for DC terminal is boosted only with single inductance, the direct current of this example is handed over Rheology changing device uses two inductance L in DC converting unit1、L2With a capacitor C2.The second switch S2, the 4th When switching tube S4 is connected, input DC power VinWith the second capacitor C2Simultaneously respectively to L1、L2Charging, makes L1、L2Energy storage； When the second switch S2, the 4th switching tube S4 are turned off, L1、L2It is formed and is connected in series, and jointly to first capacitor C1Discharge energy Amount.So in DC bus side, that is, first capacitor C1Both ends can obtain higher voltage, with traditional two-stage type inverter Busbar voltage gain is compared, and voltage gain significantly improves.In addition, four switching tubes are used only in the DC communication device of this example, It is fewer using switching tube quantity than traditional two-stage type structure, effectively reduce the conduction loss of switching tube and shutdown damage in system Consumption, control are simple；And compared to traditional two-stage type structure, the conversion of DC-AC electric energy is can be realized in same level-one in this example, Promote system delivery efficiency effectively.
When in use, the DC converting unit 1 in this example, exchange conversion unit 2 can work asynchronously, in an embodiment Middle modulation system is that two kinds of signals of control, the i.e. modulation of the modulated signal of DC converting unit 1 and exchange conversion unit 1 are believed simultaneously Number.DC converting unit 1 and exchange conversion unit 2 multiplex switch pipe S2, S4.1 duty cycle control signal of DC converting unit is protected Hold it is constant, as shown in Figure 2.Fixed voltage u can be usedrdcWith carrier wave ucIt hands over and cuts, generate the first modulated signal SdcMake DC converting unit 1 control signal, fixed voltage urdcMore than or equal to ucWhen, SdcFor high level, fixed voltage urdcLess than ucWhen, SdcFor low electricity It is flat.For exchange conversion unit, it can be cut and be modulated with carrier wave friendship with two groups 180 ° of phase mutual deviation of half-sinusoid, generate two groups Modulated signal.As shown in Fig. 2, using two groups of half-sinusoid urac1And urac2Respectively with carrier wave ucIt hands over and cuts, generate the second modulated signal Sac1With third modulated signal Sac2, signal is controlled respectively as the positive half cycle of exchange conversion unit (2), negative half period.Wherein urac1 And urac2Phase difference be 180 degree.Half-sinusoid urac1More than or equal to carrier wave ucWhen, the second modulated signal Sac1For high level； Otherwise, the second modulated signal Sac1For low level.Half-sinusoid urac2More than or equal to carrier wave ucWhen, third modulated signal Sac2For High level；Otherwise, third modulated signal Sac2For low level.
DC converting unit duty cycle signals are kept constant, and can be handed over and be cut with the modulating wave and carrier wave of constant amplitude, obtained Fixed pulse signal；The duty cycle signals of exchange conversion unit need to follow sinusoidal signal to change, need to half-sinusoid modulating wave with Carrier wave, which is handed over, to be cut, and then believes fixed pulse signal and sinusoidal impulse signal by the driving that logic circuit generates each switching tube Number.
According to the first modulated signal Sdc, the second modulated signal Sac1With third modulated signal Sac2It exports to obtain through logic circuit Switching tube driving signal, shown in logical relation such as formula (1).Four switching tubes are in high-frequency work state as a result, reduce humorous Wave component makes to load both ends output voltage waveforms closer to sine wave.Fig. 3 show the logic for generating switching tube driving signal Circuit diagram, the second modulated signal Sac1By it is non-behind the door, with the first modulated signal SdcBy with operation, generate switching tube S2 Driving signal；The driving signal of switching tube S2 passes through NOT gate, generates the driving signal of switching tube S1.Third modulated signal Sac2 By it is non-behind the door, with the first modulated signal SdcBy with operation, generate switching tube S4 driving signal；The driving of switching tube S4 is believed Number pass through NOT gate, generate switching tube S3 driving signal.Each driving signal drives corresponding switching tube, to realize turning for power It changes.
Wherein Sd1、Sd2、Sd3、Sd4The respectively driving signal of switching tube S1, S2, S3, S4, SdcFor the first modulated signal, Sac1For the second modulated signal, Sac2For third modulated signal.
According to the driving signal and working characteristics of this example switching tube, have:
Work as VinTo L1、L2When charging,
Work as L1、L2When discharged in series,
Using inductance voltage-second balance, DC bus-bar voltage gain is obtained are as follows:
Wherein,Respectively inductance L1、L2Both end voltage, DdcFor DC converting unit duty ratio.
Traditional DC-AC transform circuit boosts in input terminal only with single inductance, and DC bus side voltage increases Benefit are as follows:
So this example DC-AC converter has relative to Traditional DC-alternating current circuit in DC bus side voltage It significantly improves, solves the problems, such as that Traditional DC-alternating current circuit DC bus side voltage gain is low, and duty-cycle requirement is small, subtracts The turn-on time of small switching tube thereby also reduces the conduction loss of switching tube.Conventional transformation device such as two-stage type structure, is adopted It is more than four with switching tube quantity, and this example realizes transformation of electrical energy only with four switching tubes, switching loss is small, also reduces System loss.Two-stage type structure overall efficiency is the product of DC converting unit efficiencies and exchange conversion unit efficiencies, this example Transformation of electrical energy is realized in single-stage, and efficiency is higher than two-stage type structure.
When stable state, in positive half cycle, when S1, S4 conducting, VinWith C2Respectively to L1、L2It charges, inductance in DC converting unit In energy storage state；First capacitor C1Electric discharge, exchange conversion unit are in exchange output state, direct current and friendship are realized in control Stream converter unit works at the same time, and when DC converting cell operation, S4 conducting, when exchange conversion cell operation, S4 is also switched on, So switching tube S4 is direct current and exchange conversion units shared switching tube.Switching tube S1 conducting complementary with S2, S3 is complementary with S4 to be led It is logical.
When S2, S4 conducting, L1、L2Still in charged state, DC converting unit is in pressure-increasning state, exchange conversion list Member is in inductive current freewheeling state；S2, S4 are common switch pipe at this time.
When S1, S3 conducting, L1、L2In discharge condition.L at this time1、L2Series connection is to C1Charging, exchange conversion unit are in Inductive current freewheeling state.Negative half period working condition is similar.
In positive half cycle or negative half period, inductance L1、L2It only is in discharge condition in S1, S3 conducting, remaining is charging shape State.The output of exchange conversion unit can obtain a power frequency sinusoidal voltage at load both ends through filter unit.
According to the working characteristics of this example, it is desirable that Ddc≥Dac(max), wherein Dac(max)For exchange conversion unit maximum duty Than that output voltage can be made to obtain desired sinusoidal voltage, be illustrated in figure 3 this circuit according to Fig. 2, Fig. 3 control logic Logic modulates schematic diagram.Fig. 4 ordinate is followed successively by DC bus-bar voltage, output AC voltage, input direct-current voltage from top to bottom.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (5)

1. a kind of DC communication power converting circuit characterized by comprising DC power supply (Vin), first capacitor (C1), one Two capacitor (C2), the first inductance (L1), the second inductance (L2), first diode (D1), the second diode (D2), third diode (D3), the 4th diode (D4), first switch tube (S1), second switch (S2), third switching tube (S3), the 4th switching tube (S4), third inductance (L3) and third capacitor (C3), the first inductance (L1) first end and DC power supply (Vin) anode even It connects, the first inductance (L1) second end and the anode of the anode of the first diode (D1), the second diode (D2) connect It connects, the cathode of second diode (D2) and the second capacitor (C2) first end, the second inductance (L2) first end connect It connects, the second capacitor (C2) second end ground connection, the second inductance (L2) second end connection first diode (D1) cathode, The anode of third diode (D3) and the 4th diode (D4)；The output of cathode connection first switch tube (S1) of third diode End, the input terminal of second switch (S2) and third inductance (L3) first end, the third inductance (L3) second end with it is described Third capacitor (C3) first end connection, the 4th diode cathode connection third switching tube (S3) output end, the 4th switch Manage the input terminal of (S4), third capacitor (C3) second end, the third capacitor and a load parallel connection；First switch tube (S1) input terminal is connect with third switching tube (S3) input terminal, and with first capacitor (C1) anode be connected, first capacitor (C1) Cathode ground connection, second switch (S2) output end, the 4th switching tube (S4) output end and DC power supply (Vin) cathode be connected, direct current Power supply (Vin) cathode ground connection；DC power supply (the Vin), first capacitor (C1), the second capacitor (C2), the first inductance (L1), second Inductance (L2), first diode (D1), the second diode (D2), third diode (D3), the 4th diode (D4), first switch Pipe (S1), second switch (S2), third switching tube (S3), the 4th switching tube (S4) composition DC converting unit, described first Switching tube (S1), second switch (S2), third switching tube (S3), the 4th switching tube (S4) constitute exchange conversion unit, described Third inductance (L3) and third capacitor (C3) constitute filter unit；The DC converting unit according to a DC power supply to export One DC bus-bar voltage, wherein the DC bus-bar voltage is higher than the voltage of the DC power supply, in the second switch and In 4th switching tube when at least one conducting, the DC power supply is to first induction charging, and second capacitor is to institute State the second induction charging, first inductance and the second inductive energy storage；And in the second switch and the 4th switching tube When being turned off, second capacitor charging, first inductance is connected with second inductance converts the electric energy respectively stored To the first capacitor, to promote the voltage of the first capacitor, to promote the DC bus-bar voltage；The exchange conversion Unit is connected to the DC converting unit and receives the DC bus-bar voltage, and output DC bus-bar voltage is converted to an alternating current Pressure and an alternating current；The filter unit is used to filter out the ripple of the alternating current and alternating voltage, to provide smoothly The alternating voltage and the alternating current are in load.
2. a kind of DC communication power converting circuit according to claim 1, it is characterised in that: the first switch tube with The second switch complementation conducting, the third switching tube and the 4th switching tube complementation conducting.
3. a kind of DC communication power converting circuit according to claim 1, it is characterised in that: the DC bus-bar voltage With the proportionate relationship of the voltage of the DC power supply are as follows:
Wherein, UnFor the voltage of the DC power supply, UdcFor the DC bus-bar voltage, DdcFor the duty of DC converting unit Than.
4. a kind of DC communication power converting circuit according to claim 1, it is characterised in that:
First switch tube, second switch, third switching tube, the driving signal relationship of the 4th switching tube are as follows:
Wherein Sd1、Sd2、Sd3、Sd4The drive of respectively described first switch tube, second switch, third switching tube, the 4th switching tube Dynamic signal, SdcFor one first modulated signal, Sac1For one second modulated signal, Sac2For a third modulated signal.
5. being based on a kind of DC communication power converting circuit as claimed in claim 4, it is characterised in that:
First modulated signal is that the modulating wave of a constant amplitude and a carrier wave hand over the fixed pulse signal for cutting and generating；Described Two modulated signals are that one first half-sinusoid modulating wave and a carrier wave hand over the pulse signal for cutting and generating；The third modulated signal is One second half-sinusoid modulating wave and the carrier wave hand over the pulse signal for cutting and generating, wherein the second half-sinusoid modulating wave with The phase difference of the first half-sinusoid modulating wave is 180 degree.
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