CN109687743A - A kind of power converting circuit - Google Patents

A kind of power converting circuit Download PDF

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Publication number
CN109687743A
CN109687743A CN201811648935.5A CN201811648935A CN109687743A CN 109687743 A CN109687743 A CN 109687743A CN 201811648935 A CN201811648935 A CN 201811648935A CN 109687743 A CN109687743 A CN 109687743A
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China
Prior art keywords
switching tube
capacitor
inductance
switch
voltage
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CN201811648935.5A
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Chinese (zh)
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CN109687743B (en
Inventor
阚加荣
孙浩
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
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M7/5387—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 in a bridge configuration
    • H02M7/53871—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 in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing 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 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 DC power supply；Exchange conversion unit receives DC bus-bar voltage, exports an alternating voltage and an alternating current；Filter unit filters out the ripple of alternating current and alternating voltage, to provide smooth alternating voltage and alternating current to load.Power converting circuit 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 power converting circuit
Technical field
The present invention relates to the technical fields of transformation of electrical energy, more particularly, to a kind of 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 power source translation circuit and the power converting circuit of ability.
Technical solution:
A kind of power converting circuit, including DC power supply, first capacitor, the second capacitor, coupling inductance, first diode, Second diode, third diode, first switch tube, second switch, third switching tube, the 4th switching tube, third inductance and Third capacitor, the coupling inductance include primary side inductance, secondary inductance, the Same Name of Ends and the DC power supply of the primary side inductance Anode connection, the different name end of the primary side inductance connect with the Same Name of Ends of the anode of the first diode, secondary inductance, institute The different name end for stating secondary inductance is connect with the second capacitor first end；The second end of second capacitor connects first diode Cathode, the second diode and third diode anode；The output end of the cathode connection first switch tube of second diode, the The input terminal of two switching tubes and the first end of third inductance, the first end of the second end of the third inductance and the third capacitor Connection, the output end of the cathode connection third switching tube of third diode, the input terminal of the 4th switching tube, the second of third capacitor End, the third capacitor and a load parallel connection；First switch tube input terminal is connect with third switching tube input terminal, and with The first end of one capacitor is connected, the second end ground connection of first capacitor, second switch output end, the 4th switching tube output end and straight It flows power cathode to be connected, DC power cathode ground connection；The DC power supply, first capacitor, the second capacitor, coupling inductance, first Diode, the second diode, third diode, first switch tube, second switch, third switching tube, the 4th switching tube are constituted DC converting unit, the first switch tube, 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 according to a DC power supply to export always Busbar voltage is flowed, wherein the DC bus-bar voltage is higher than the voltage of the DC power supply, the second switch and described the When at least one in four switching tubes is connected, the DC power supply is to primary side induction charging, and secondary inductance is to the second capacitor charging, institute State the second capacitor and primary side inductive energy storage；And when the second switch and the 4th switching tube are turned off, the coupling The inductance electric energy that will respectively store of connecting with second capacitor is converted to the first capacitor, to promote the first capacitor Voltage promotes the DC bus-bar voltage；The exchange conversion unit receives the DC bus-bar voltage, exports an alternating current Pressure and an alternating current；The filter unit filters out the ripple of the alternating current and alternating voltage, to provide smooth exchange Voltage and alternating current are to 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, UinFor the voltage of DC power supply, UdcFor DC bus-bar voltage, DdcFor the duty ratio of DC converting unit, n For coupling inductance pair side and primary side turn ratio, n=N2/N1。
Further, first switch tube, second switch, third switching tube, the 4th switching tube driving signal logic close It is as follows:
Wherein, Sd1、Sd2、Sd3、Sd4The respectively described first switch tube, second switch, third switching tube, the 4th switch The driving signal of pipe, SdcFor the first modulated signal, Sac1For the second modulated signal, Sac2For third modulated signal.
Further, first modulated signal is that the modulating wave of constant amplitude and carrier wave hand over the fixed pulse for cutting and generating to believe Number；Second modulated signal is that the first half-sinusoid modulating wave and carrier wave hand over the pulse signal for cutting and generating；The third modulation Signal is that the second half-sinusoid modulating wave and 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.
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 power converting circuit circuit diagram.
Fig. 2 is power converting circuit modulation scheme schematic diagram.
Fig. 3 is that power converting circuit switching tube driving signal generates schematic diagram.
Fig. 4 is power converting circuit input, 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 power converting circuit, including DC converting unit, exchange conversion unit, filter unit, leads to DC converting unit is crossed to obtain higher DC bus-bar voltage and reduce to the decoupling capacitance requirement of DC bus side, compared to two Grade formula structure, is not necessarily to transformer, direct current, alternating current unit are in same level-one, obtained DC bus-bar voltage few using switching tube quantity It is higher, switching loss is reduced, 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, power converting circuit includes DC converting unit 1, exchange conversion unit 2 and filter unit 3.Due to Higher voltage should be obtained at first capacitor both ends, reduce the use of switching tube to the greatest extent again to improve system effectiveness, 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 wraps Include input DC power Vin, first capacitor C1, the second capacitor C2, a coupling inductance include primary inductor L1, secondary inductance L2, with And first diode D1, the second diode D2, third diode D3, first switch tube S1, second switch S2, third switching tube S3, the 4th switching tube S4.When D1 is connected, DC power supply VinTo the coupling inductance primary side L1Charging, primary side magnetizing inductance energy storage； Secondary inductance L2To the second capacitor C2Charging.When the first switch tube S1 and the third switching tube S3 are simultaneously turned on, institute State coupling inductance and the second capacitor C2It connects to the first capacitor C1It releases energy.Second diode D2, third diode D3, When for second switch S2, the 4th switching tube S4 conducting, make the primary side magnetizing inductance L of coupling inductance1With the second capacitor C2Storage Energy；When second switch S2, the 4th switching tube S4 are turned off, it is supplied to first capacitor C1Charging path.The DC converting list as a result, Member is input voltage VinIt is increased to certain grade, it can be in DC bus side, that is, first capacitor C1Both ends obtain higher electricity Pressure is used as the input source of exchange conversion unit with this, matched with the output voltage for exchanging side.Exchange conversion unit 2 includes the One bridge arm, the second bridge arm, each bridge arm are connected in parallel.Wherein the first bridge arm includes first switch tube S1 and second switch S2, the Two bridge arms include third switching tube S3 and the 4th switching tube S4.The exchange conversion unit is to by the direct current energy of DC bus side Be converted to AC energy output.Filter unit is filtered exchange conversion unit output voltage, electric current, third inductance L3It is used as Filter inductance keeps output load current smoothened, has flat wave effect.Third capacitor C3It is smooth defeated for output filter capacitor Voltage out makes to load both ends output voltage waveforms close to sine wave.
Wherein, the coupling inductance primary side L1Same Name of Ends and DC power supply VinAnode connection, L1Different name end and D1 Anode, secondary inductance L2Same Name of Ends is connected；L2Different name end and the second capacitor C2First end connection；Second capacitor C2? The connection of the cathode of two ends and D1, the second capacitor C2Second end be also connected with the anode of the second diode D2, third diode D3, Two diode D2, third diode D3 cathode be separately connected the first bridge arm midpoint, the second bridge arm midpoint.The output end of S1 is distinguished With third inductance L3First end, second switch S2 input terminal connection；The output end and third capacitor C of third switching tube S33 Second end, the connection of the 4th switching tube S4 input terminal.The connection of first switch tube S1 input terminal third switching tube S3 input terminal, and with the One capacitor C1Anode be connected, first capacitor C1Cathode ground connection.The output end of second switch S2 and the 4th switching tube S4 are exported End connection, and with DC power supply VinCathode is connected, VinCathode ground connection；Load both ends and C3First 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 coupling inductance and an intermediate capacitance C in DC converting unit2, the second switch S2, the 4th When switching tube S4 is connected, DC power supply VinTo the coupling inductance primary side L1Charging, primary inductor L1Energy storage；Secondary inductance L2It is right The second capacitor C2Charging.When the second switch S2, the 4th switching tube S4 are turned off, DC power supply Vin, coupling inductance, C2 It is formed and is connected in series to first capacitor C1It releases energy, so in DC bus side, that is, first capacitor C1Both ends can obtain Higher voltage, compared with traditional two-stage type inverter busbar voltage gain, voltage gain is significantly improved.In addition, this example Four switching tubes are used only in DC communication device, fewer using switching tube quantity than traditional two-stage type structure, effectively reduce and are The conduction loss and turn-off power loss of switching tube in system, control are simple；And compared to traditional two-stage type structure, this example is same The conversion of DC-AC electric energy can be realized in grade, promotes 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 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 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 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 L1、C2When charging,
Work as L1、C2When discharged in series,
Utilize inductance voltage-second balance, DC bus-bar voltage gain are as follows:
Wherein, uL1、uL2Respectively primary inductor L1, secondary inductance L2Both end voltage, DdcFor DC converting unit duty ratio. N is coupling inductance pair side and primary side turn ratio, n=N2/N1。
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, VinTo L1Charging, L2To C2It charges, primary side in DC converting unit Magnetizing inductance is in energy storage state；First capacitor C1Electric discharge, exchange conversion unit are in exchange output state, realize in control Direct current and exchange conversion unit work 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 it is complementary with S2 conducting, S3 with S4 complementation conducting.
When S2, S4 conducting, L1、C2Still 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、C2In discharge condition.L at this time1、C2Series 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, L1、C2It only is in discharge condition in S1, S3 conducting, remaining is charged state.It hands over The output of stream converter 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 power converting circuit, it is characterised in that: including DC power supply (Vin), first capacitor (C1), the second capacitor (C2)、 Coupling inductance, first diode (D1), the second diode (D2), third diode (D3), first switch tube (S1), second switch Manage (S2), third switching tube (S3), the 4th switching tube (S4), third inductance (L3) and third capacitor (C3), the coupling inductance packet Include primary side inductance (L1), secondary inductance (L2), the primary side inductance (L1) Same Name of Ends and the DC power supply (Vin) anode even It connects, the primary side inductance (L1) different name end and the first diode (D1) anode, secondary inductance (L2) Same Name of Ends connect It connects, the secondary inductance (L2) different name end and the second capacitor (C2) first end connection；Second capacitor (the C2) second End connects the anode of the cathode of first diode (D1), the second diode (D2) and third diode (D3)；Second diode Cathode connects the input terminal and third inductance (L of the output end of first switch tube (S1), second switch (S2)3) first end, Third inductance (the L3) second end and the third capacitor (C3) first end connection, the cathode connection the of third diode The output end of three switching tubes (S3), the input terminal of the 4th switching tube (S4), third capacitor (C3) second end, the third capacitor With a load parallel connection；First switch tube (S1) input terminal is connect with third switching tube (S3) input terminal, and and first capacitor (C1) first end be connected, first capacitor (C1) second end ground connection, second switch (S2) output end, the 4th switching tube (S4) Output end and DC power supply (Vin) cathode be connected, DC power supply (Vin) cathode ground connection；DC power supply (the Vin), first capacitor (C1), the second capacitor (C2), coupling inductance, first diode (D1), the second diode (D2), third diode (D3), first open It closes pipe (S1), second switch (S2), third switching tube (S3), the 4th switching tube (S4) and constitutes DC converting unit, described the One switching tube (S1), second switch (S2), third switching tube (S3), the 4th switching tube (S4) constitute exchange conversion unit, institute State third inductance (L3) and third capacitor (C3) constitute filter unit；The DC converting unit is to defeated according to a DC power supply A DC bus-bar voltage out, wherein the DC bus-bar voltage is higher than the voltage of the DC power supply, the second switch (S2) when and at least one in the 4th switching tube (S4) is connected, the DC power supply is to primary side inductance (L1) charging, secondary side Inductance (L2) to the second capacitor (C2) charging, the second capacitor (C2) and primary side inductance (L1) energy storage；And in the second switch When pipe (S2) and the 4th switching tube (S4) are turned off, the coupling inductance and the second capacitor (C2) connect and will respectively store up The electric energy deposited is converted to the first capacitor (C1), to promote the first capacitor (C1) voltage, that is, promote the DC bus Voltage；The exchange conversion unit receives the DC bus-bar voltage, exports an alternating voltage and an alternating current；The filtering Unit filters out the ripple of the alternating current and alternating voltage, to provide smooth alternating voltage and alternating current to load.
2. a kind of power converting circuit according to claim 1, it is characterised in that: the first switch tube (S1) with it is described The complementary conducting of second switch (S2), the third switching tube (S3) and the complementary conducting of the 4th switching tube (S4).
3. a kind of power converting circuit according to claim 1, it is characterised in that: the DC bus-bar voltage and described straight The proportionate relationship of the voltage in galvanic electricity source are as follows:
Wherein, UinFor the voltage of DC power supply, UdcFor DC bus-bar voltage, DdcFor the duty ratio of DC converting unit, n is coupling Close inductance pair side and primary side turn ratio, n=N2/N1。
4. a kind of power converting circuit according to claim 1, it is characterised in that: first switch tube, second switch, Three switching tubes, the driving signal logical relation of the 4th switching tube are as follows:
Wherein, Sd1、Sd2、Sd3、Sd4Respectively described first switch tube, second switch, third switching tube, the 4th switching tube Driving signal, SdcFor the first modulated signal, Sac1For the second modulated signal, Sac2For third modulated signal.
5. being based on a kind of power converting circuit as claimed in claim 4, it is characterised in that: first modulated signal is that amplitude is permanent Fixed modulating wave and carrier wave hands over the fixed pulse signal for cutting and generating；Second modulated signal be the first half-sinusoid modulating wave with Carrier wave hands over the pulse signal for cutting and generating；The third modulated signal is that the second half-sinusoid modulating wave and carrier wave hand over the arteries and veins for cutting and generating Signal is rushed, wherein the phase difference of the second half-sinusoid modulating wave and the first half-sinusoid modulating wave is 180 degree.
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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
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* Cited by examiner, † Cited by third party
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CN114696611A (en) * 2020-12-28 2022-07-01 圣邦微电子（北京）股份有限公司 Power converter and control method thereof

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