CN109412450A - A kind of DC communication electric power conversion apparatus - Google Patents

A kind of DC communication electric power conversion apparatus Download PDF

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Publication number
CN109412450A
CN109412450A CN201811648804.7A CN201811648804A CN109412450A CN 109412450 A CN109412450 A CN 109412450A CN 201811648804 A CN201811648804 A CN 201811648804A CN 109412450 A CN109412450 A CN 109412450A
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China
Prior art keywords
inductance
diode
switching tube
voltage
switch
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CN201811648804.7A
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Chinese (zh)
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CN109412450B (en
Inventor
吴冬春
阚加荣
吴云亚
商志根
薛迎成
张斌锋
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Zhongtian Broadband Technology Co Ltd
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Yangcheng Institute of Technology
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Classifications

    • 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)
  • Inverter Devices (AREA)

Abstract

The invention discloses a kind of DC communication electric power conversion apparatus, including sequentially connected DC converting unit, exchange conversion unit, filter unit；The DC converting unit is to export corresponding DC bus-bar voltage according to DC power supply, and DC bus-bar voltage is higher than the voltage of DC power supply；The exchange conversion unit is used to be converted to DC bus-bar voltage corresponding alternating voltage and alternating current, and filter unit is used to filter out the ripple of alternating current and alternating voltage, provides smooth alternating voltage and alternating current in load.The present invention 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, without transformer, direct current, alternating current unit are in same level-one, few using switching tube quantity, obtained DC bus-bar voltage is higher, reduces switching tube conduction loss and turn-off power loss, control is simple, high reliablity and overall efficiency height.

Description

A kind of DC communication electric power conversion apparatus
Technical field
The present invention relates to the technical fields of transformation of electrical energy, more particularly, to a kind of DC communication electric power conversion apparatus.
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: for overcome the deficiencies in the prior art, the present invention provides a kind of DC communication electric power conversion apparatus, phase Than traditional two-stage type structure, DC boosting ability is higher, requires inductance value small, reduction inductance copper loss, iron loss, core loss, Switching tube negligible amounts and pass-through state is not present, converter whole efficiency gets a promotion, and system reliability is high.
Technical solution: to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of DC communication electric power conversion apparatus, including sequentially connected DC converting unit, exchange conversion unit, filtering Unit；
Wherein, the DC converting unit is to export corresponding DC bus-bar voltage according to DC power supply, and direct current is female Line voltage is higher than the voltage of DC power supply；The DC converting unit includes DC power supply, first capacitor, the first inductance, second Inductance, second switch and the 4th switching tube, when at least one conducting in second switch and the 4th switching tube, first electricity Sense, the second inductance store electric energy；When second switch and the 4th switching tube are turned off, first inductance, the second inductance will The electric energy respectively stored converts the voltage that first capacitor is promoted to first capacitor, i.e. DC bus-bar voltage；
The exchange conversion unit is used to receive the DC bus-bar voltage of DC converting unit output, and is converted into pair The alternating voltage and alternating current answered；The filter unit is used to filter out the ripple of alternating current and alternating voltage, provides smooth Alternating voltage and alternating current in load.
Further, the DC converting unit also includes first diode, the second diode, third diode, the 4th Diode, the 5th diode, the 6th diode, the 8th diode；
The first end of first inductance is connect with DC power anode, the first end of the second inductance through first diode with DC power anode connection；The second end of first inductance is connect through the second diode with the first end of the second inductance, and first The second end of inductance is connect through third diode with the second end of the second inductance.
Further, the exchange conversion unit includes the first bridge arm, the second bridge arm, third bridge being connected in parallel with each other Arm, four bridge legs, wherein the first bridge arm includes first switch tube and the 7th diode connected in series, third bridge arm includes third Switching tube and the 9th diode connected in series, the second bridge arm are concatenated by second switch with the 6th diode, the 4th bridge Arm is concatenated by the 4th switching tube with the 8th diode.
Further, first switch tube conducting complementary with second switch, and third switching tube and the 4th switching tube Complementation conducting.
Further, the midpoint of first bridge arm is the tie point of first switch tube and the 7th diode, the second bridge arm Midpoint be second switch and the 6th diode tie point, the midpoint of third bridge arm is third switching tube and the 9th diode Tie point, the midpoints of four bridge legs is the tie point of the 4th switching tube and the 8th diode.
Further, the filter unit includes third inductance, the 4th inductance, the 5th inductance, the 6th inductance, the second electricity Hold, load；Wherein, the first end of the third inductance is connected to the midpoint of the first bridge arm, and the first end of the 4th inductance is connected to The midpoint of second bridge arm, the first end of the 5th inductance are connected to the midpoint of third bridge arm, and the first end of the 6th inductance is connected to The midpoint of four bridge legs；The second end of the third inductance is connected with the second end of the 4th inductance, the first end of the second capacitor, the The second end of five inductance is connected with the second end of the 6th inductance, the second end of the second capacitor, and the load and the second capacitor are simultaneously Connection connection.
Further, the voltage ratio relationship of the DC bus-bar voltage and DC power supply are as follows:
Wherein, VinFor the voltage of DC power supply, VdcFor DC bus-bar voltage, DdcFor the duty ratio of DC converting unit.
Further, the first switch tube, second switch, third switching tube, the 4th switching tube driving signal patrol The relationship of collecting is as follows:
Wherein S1, S2, S3, S4 are respectively the drive of first switch tube, second switch, third switching tube, the 4th switching tube Dynamic signal, SdcFor the first modulated signal, Sac1For the second modulated signal, Sac2For third modulated signal.
Further, the first modulated signal SdcThe fixation arteries and veins for cutting and generating is handed over for the modulating wave of constant amplitude and a carrier wave Rush signal, the second modulated signal Sac1The pulse signal for cutting and generating, third tune are handed over for the first half-sinusoid modulating wave and the carrier wave Signal S processedac2The pulse signal for cutting and generating is handed over for the second half-sinusoid modulating wave and the carrier wave；Wherein described second sinusoidal half The phase difference of wave modulating wave and the first half-sinusoid modulating wave is 180 degree.
In the present invention, DC converting unit duty cycle signals are kept constant, and can use the modulating wave and carrier wave of constant amplitude It hands over and cuts, obtain fixed pulse signal；The duty cycle signals of exchange conversion unit need to follow sinusoidal signal to change, and need to use half-sinusoid Modulating wave and carrier wave, which are handed over, to be cut, and fixed pulse signal and sinusoidal impulse signal are then generated each switching tube by logic circuit Driving signal.
The utility model has the advantages that a kind of DC communication electric power conversion apparatus proposed by the present invention has as follows compared with prior art Advantage:
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 the circuit diagram of the embodiment of the present invention；
Fig. 2 a-2c is respectively the modulation scheme schematic diagram of three modulated signals in the embodiment of the present invention；
Fig. 3 is the logic circuit schematic diagram of each switching tube driving signal in the embodiment of the present invention；
Fig. 4 is the Transformation Graphs of input in the embodiment of the present invention, output voltage and DC bus-bar voltage.
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 electric power conversion apparatus, 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.
As shown in Figure 1, the DC communication electric power conversion apparatus includes DC converting unit 1, exchange conversion unit 2 and filter Wave unit 3.Due to that should obtain higher voltage at first capacitor both ends, the use for reducing switching tube to the greatest extent again is to improve System efficiency, so DC converting unit 1, exchange conversion unit 2 meeting common sparing switching tube are realized without influencing respective function.
Wherein, the DC converting unit 1 includes input DC power Vin, first capacitor C1, the first inductance L1, second electricity Feel L2And diode D1, D2, D3, D4, D5, D6, D8.When D1, D2 are connected, L1、L2It is in parallel to store energy simultaneously；When D3 is connected, L1、L2It connects to the first capacitor C1It releases energy.4th diode D4, the 5th diode D5, for second switch S2, When 4th switching tube S4 is connected, make L1、L2Energy storage, and when S2, S4 shutdown, it is supplied to first capacitor C1Charging path.As a result, should DC converting unit is input voltage VinIt is increased to certain grade, it can be in DC bus side, that is, first capacitor C1Both ends obtain Higher voltage is obtained, the input source of exchange conversion unit is used as with this, is matched with the output voltage for exchanging side.
The exchange conversion unit 2 includes the first bridge arm, the second bridge arm, third bridge arm and four bridge legs, and each bridge arm is in parallel Connection.Wherein the first bridge arm includes first switch tube S1 and diode D7 connected in series, and the second bridge arm is by second switch S2 And diode D6 is connected in series, third bridge arm includes third switching tube S3 and diode D9 connected in series, and four bridge legs are by the Four switching tube S4 and diode D8 are connected in series.Wherein, diode D6, D7, D8, D9 is inductance L3、L4、L5、L6Afterflow is provided to return Road.Since diode is unfavorable for high frequency direction changing ratio in switching tube body, and conducting turn-off power loss is larger, and four diodes are all made of outside Diode, such as fast recovery diode.The exchange conversion unit is to be converted to AC energy for the direct current energy of DC bus side Output.
The filter unit is filtered exchange conversion unit output voltage, electric current, including third inductance L3, the 4th electricity Feel L4, the 5th inductance L5, the 6th inductance L6, this four inductance can be used as filter inductance, keep output load current smoothened, have There is flat wave to act on.Second capacitor C2For output filter capacitor, smooth output voltage makes to load both ends output voltage waveforms close to just String wave.
Particular circuit configurations include L1First end and DC power supply VinAnode connection, L2First end through diode D1 and VinAnode connection；L1Second end through D2 and L2First end be connected, L1Second end is through D3 and L2Second end be connected, L2Second end be connected respectively with the anode of diode D6, D8 through diode D4, D5；
The output end of switching tube S1 respectively with inductance L3First end, diode D7 cathode are connected, the input terminal of switching tube S2 With diode D6 anode, inductance L4First end connection, the output end and inductance L of switching tube S35First end, diode D9 cathode phase Even, the input terminal and inductance L of switching tube S46First end, diode D8 anode are connected；
Inductance L3Second end and inductance L4Second end, capacitor C2First end is connected, inductance L5Second end and inductance L6The Two ends, capacitor C2Second end is connected；Input terminal, diode D6, D8 cathode and the capacitor C of switching tube S1, S31First end is connected, and opens Close the output end and diode D7, D9 anode, V of pipe S2, S4inCathode is connected, C1Second end and VinCathode ground connection；Load both ends With capacitor C2It is in parallel.
Compared to traditional two-stage type structure for DC terminal is boosted only with single inductance, the direct current of the present embodiment AC converter uses two inductance L in DC converting unit1、L2.It is led in second switch S2, the 4th switching tube S4 When logical, the input DC power VinTo L1、L2Charging, makes L1、L2Energy storage；It is closed in second switch S2, the 4th switching tube S4 When disconnected, L1、L2It is formed and is connected in series, and jointly to first capacitor C1It releases energy.So in DC bus side, that is, first capacitor C1 Both ends can obtain voltage more higher than traditional two-stage type structure, and voltage gain significantly improves.In addition, the DC communication of this example Four switching tubes are used only in device, fewer using switching tube quantity than traditional two-stage type structure, effectively reduce in system and switch The conduction loss and turn-off power loss of pipe, control are simple；And compared to traditional two-stage type structure, this example can be real in same level-one Existing DC-AC electric energy conversion, promotes system delivery efficiency effectively.
In in use, DC converting unit 1, exchange conversion unit 2 in this example 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 2 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 are protected It holds constant.
As shown in Figure 2 a, fixed voltage u can be usedrdcWith carrier wave ucIt hands over and cuts, generate the first modulated signal SdcMake DC converting list The control signal of member 1, in fixed voltage urdcMore than or equal to ucWhen, SdcFor high level, in fixed voltage urdcLess than ucWhen, Sdc For low level.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, produced Raw two groups of modulated signals.As shown in Fig. 2 b, 2c, using two groups of half-sinusoid urac1And urac2Respectively with carrier wave ucIt hands over and cuts, generate the Two 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 urac1And urac2Phase difference be 180 degree.In half-sinusoid urac1More than or equal to carrier wave ucWhen, the second modulated signal Sac1 For high level；Otherwise, the second modulated signal Sac1For low level.In half-sinusoid urac2More than or equal to carrier wave ucWhen, third tune Signal S processedac2For high level；Otherwise, third modulated signal Sac2For low level.
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 S1, S2, S3, S4 are respectively the driving signal of switching tube S1, S2, S3, S4, SdcFor the first modulated signal, Sac1 For 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,
Utilize inductance voltage-second balance, DC bus-bar voltage gain 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.Conventional transformation device such as two-stage Formula structure is more than four using switching tube quantity, and this example realizes transformation of electrical energy, switching loss only with four switching tubes It is small, also reduce system loss.Two-stage type structure overall efficiency is DC converting unit efficiencies and exchange conversion unit efficiencies Product, this example realize transformation of electrical energy in single-stage, and efficiency is higher than two-stage type structure.
When stable state, in positive half cycle, when S1, S4 conducting, VinTo L1、L2It charges simultaneously, at this time L1、L2Parallel connection, DC converting Inductance is in energy storage state in unit；First capacitor C1Electric discharge, exchange conversion unit are in exchange output state, upper real in control Existing direct current and exchange conversion unit work at the same time, and when DC converting cell operation, S4 conducting, exchange conversion cell operation When, 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 conducting complementary with S4.
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.When stable state, C1Both end voltage fluctuates up and down around a fixed voltage, constantly progress charge and discharge.Exchange conversion unit output warp Filter unit can obtain a power frequency sinusoidal voltage at load both ends.
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 is the DC bus-bar voltage V in the present embodimentdc, output AC voltage Vo, input direct-current voltage Vin Transformation Graphs.
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 (9)

1. a kind of DC communication electric power conversion apparatus, which is characterized in that including sequentially connected DC converting unit, exchange conversion Unit, filter unit；
Wherein, the DC converting unit is to export corresponding DC bus-bar voltage, and DC bus electricity according to DC power supply Pressure is higher than the voltage of DC power supply；The DC converting unit include DC power supply, first capacitor, the first inductance, the second inductance, Second switch and the 4th switching tube, when at least one conducting in second switch and the 4th switching tube, first inductance, the Two inductance store electric energy；When second switch and the 4th switching tube are turned off, first inductance, the second inductance will be stored up respectively The electric energy deposited converts the voltage that first capacitor is promoted to first capacitor, i.e. DC bus-bar voltage；
The exchange conversion unit is used to receive the DC bus-bar voltage of DC converting unit output, and is converted into corresponding Alternating voltage and alternating current；The filter unit is used to filter out the ripple of alternating current and alternating voltage, provides smooth friendship Galvanic electricity pressure and alternating current are in load.
2. a kind of DC communication electric power conversion apparatus according to claim 1, which is characterized in that the DC converting unit It also include first diode, the second diode, third diode, the 4th diode, the 5th diode, the 6th diode, the 8th Diode；
The first end of first inductance is connect with DC power anode, and the first end of the second inductance is through first diode and direct current Positive pole connection；The second end of first inductance is connect through the second diode with the first end of the second inductance, the first inductance Second end connect through third diode with the second end of the second inductance.
3. a kind of DC communication electric power conversion apparatus according to claim 2, which is characterized in that the exchange conversion unit Including the first bridge arm, the second bridge arm, third bridge arm, four bridge legs being connected in parallel with each other, wherein the first bridge arm is opened including first Closing pipe and the 7th diode connected in series, third bridge arm includes third switching tube and the 9th diode connected in series, and second Bridge arm is concatenated by second switch with the 6th diode, four bridge legs concatenated by the 4th switching tube with the 8th diode and At.
4. a kind of DC communication electric power conversion apparatus according to claim 3, which is characterized in that the first switch tube with Second switch complementation conducting, and third switching tube and the 4th switching tube complementation conducting.
5. a kind of DC communication electric power conversion apparatus according to claim 4, which is characterized in that in first bridge arm Point is the tie point of first switch tube and the 7th diode, and the midpoint of the second bridge arm is the company of second switch and the 6th diode Contact, the midpoint of third bridge arm are the tie point of third switching tube and the 9th diode, and the midpoint of four bridge legs is the 4th switch The tie point of pipe and the 8th diode.
6. a kind of DC communication electric power conversion apparatus according to claim 5, which is characterized in that the filter unit includes Third inductance, the 4th inductance, the 5th inductance, the 6th inductance, the second capacitor, load；Wherein, the first end of the third inductance connects It is connected to the midpoint of the first bridge arm, the first end of the 4th inductance is connected to the midpoint of the second bridge arm, the first end connection of the 5th inductance In the midpoint of third bridge arm, the first end of the 6th inductance is connected to the midpoint of four bridge legs；The second end of the third inductance with The second end of 4th inductance, the first end of the second capacitor are connected, the second end of the second end of the 5th inductance and the 6th inductance, the The second end of two capacitors is connected, and the load is connected in parallel with the second capacitor.
7. a kind of DC communication electric power conversion apparatus according to claim 1, which is characterized in that the DC bus-bar voltage With the voltage ratio relationship of DC power supply are as follows:
Wherein, VinFor the voltage of DC power supply, VdcFor DC bus-bar voltage, DdcFor the duty ratio of DC converting unit.
8. a kind of DC communication electric power conversion apparatus according to claim 4, which is characterized in that the first switch tube, Second switch, third switching tube, the driving signal logical relation of the 4th switching tube are as follows:
Wherein S1, S2, S3, S4 are respectively that the driving of first switch tube, second switch, third switching tube, the 4th switching tube is believed Number, SdcFor the first modulated signal, Sac1For the second modulated signal, Sac2For third modulated signal.
9. a kind of DC communication electric power conversion apparatus according to claim 8, which is characterized in that first modulated signal SdcThe fixed pulse signal for cutting and generating, the second modulated signal S are handed over for the modulating wave of constant amplitude and a carrier waveac1For the first sine Semi-wave modulated wave and the carrier wave hand over the pulse signal for cutting and generating, third modulated signal Sac2For the second half-sinusoid modulating wave with The carrier wave hands over the pulse signal for cutting and generating；The wherein phase of the second half-sinusoid modulating wave and the first half-sinusoid modulating wave Potential difference is 180 degree.
CN201811648804.7A 2018-12-30 2018-12-30 DC/AC power supply conversion device Active CN109412450B (en)

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CN109412450B CN109412450B (en) 2021-06-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1859824A (en) * 2006-05-30 2006-11-08 浙江大学 Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation
US20080018265A1 (en) * 2006-07-20 2008-01-24 Industrial Technology Research Institute Single-stage electronic ballast device
CN103887955A (en) * 2014-04-08 2014-06-25 盐城工学院 Grid-connected inverter for low-frequency current ripple output restraining of fuel cell and control device
CN205490142U (en) * 2016-03-23 2016-08-17 西安工业大学 Switched inductor boost converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1859824A (en) * 2006-05-30 2006-11-08 浙江大学 Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation
US20080018265A1 (en) * 2006-07-20 2008-01-24 Industrial Technology Research Institute Single-stage electronic ballast device
CN103887955A (en) * 2014-04-08 2014-06-25 盐城工学院 Grid-connected inverter for low-frequency current ripple output restraining of fuel cell and control device
CN205490142U (en) * 2016-03-23 2016-08-17 西安工业大学 Switched inductor boost converter

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